Geografic-Information-System/gui/wxpython/gui_modules/dbm.py

"""
@package dbm.py

@brief GRASS Attribute Table Manager

This program is based on FileHunter, published in 'The wxPython Linux
Tutorial' on wxPython WIKI pages.

It also uses some functions at
http://aspn.activestate.com/ASPN/Cookbook/Python/Recipe/426407

@code
python dbm.py vector@mapset
@endcode

List of classes:
 - Log
 - VirtualAttributeList
 - AttributeManager
 - VectorDBInfo

(C) 2007-2009 by the GRASS Development Team

This program is free software under the GNU General Public
License (>=v2). Read the file COPYING that comes with GRASS
for details.

@author Jachym Cepicky <jachym.cepicky gmail.com>
@author Martin Landa <landa.martin gmail.com>
"""

import sys
import os
import locale
import tempfile
import copy

### i18N
import gettext
gettext.install('grasswxpy', os.path.join(os.getenv("GISBASE"), 'locale'), unicode=True)

import globalvar
if not os.getenv("GRASS_WXBUNDLED"):
    globalvar.CheckForWx()

import wx
import wx.lib.mixins.listctrl as listmix
import wx.lib.flatnotebook as FN

import sqlbuilder
import gcmd
import utils
import gdialogs
import gselect
from debug import Debug
from dbm_dialogs import ModifyTableRecord
from preferences import globalSettings as UserSettings

def unicodeValue(value):
    """Encode value"""
    enc = UserSettings.Get(group='atm', key='encoding', subkey='value')
    if enc:
        value = unicode(value, enc)
    elif os.environ.has_key('GRASS_DB_ENCODING'):
        value = unicode(value, os.environ['GRASS_DB_ENCODING'])
    else:
        try:
            value = unicode(value, 'ascii')
        except UnicodeDecodeError:
            value = _("Unable to decode value. Set encoding in GUI preferences ('Attributes').")
    
    return value

class Log:
    """
    The log output is redirected to the status bar of the containing frame.
    """
    def __init__(self, parent):
        self.parent = parent

    def write(self, text_string):
        """Update status bar"""
        self.parent.SetStatusText(text_string.strip())


class VirtualAttributeList(wx.ListCtrl,
                           listmix.ListCtrlAutoWidthMixin,
                           listmix.ColumnSorterMixin):
    """
    Support virtual list class
    """
    def __init__(self, parent, log, mapDBInfo, layer):
        #
        # initialize variables
        #
        self.parent  = parent
        self.log     = log
        self.mapDBInfo = mapDBInfo
        self.layer   = layer
        
        self.columns = {} # <- LoadData()

        wx.ListCtrl.__init__(self, parent=parent, id=wx.ID_ANY,
                             style=wx.LC_REPORT | wx.LC_HRULES |
                             wx.LC_VRULES | wx.LC_VIRTUAL | wx.LC_SORT_ASCENDING)
        
        try:
            keyColumn = self.LoadData(layer)
        except gcmd.DBMError, e:
            e.Show()
            return
        
        #
        # add some attributes (colourful background for each item rows)
        #
        self.attr1 = wx.ListItemAttr()
        self.attr1.SetBackgroundColour(wx.Colour(238,238,238))
        self.attr2 = wx.ListItemAttr()
        self.attr2.SetBackgroundColour("white")
        self.il = wx.ImageList(16, 16)
        self.sm_up = self.il.Add(wx.ArtProvider_GetBitmap(wx.ART_GO_UP,   wx.ART_TOOLBAR,
                                                          (16,16)))
        self.sm_dn = self.il.Add(wx.ArtProvider_GetBitmap(wx.ART_GO_DOWN, wx.ART_TOOLBAR,
                                                          (16,16)))
        self.SetImageList(self.il, wx.IMAGE_LIST_SMALL)
        
        # setup mixins
        listmix.ListCtrlAutoWidthMixin.__init__(self)
        listmix.ColumnSorterMixin.__init__(self, len(self.columns))

        # sort item by category (id)
        if keyColumn > -1:
            self.SortListItems(col=keyColumn, ascending=True) 
        else:
            self.SortListItems(col=0, ascending=True) 
        
        # events
        self.Bind(wx.EVT_LIST_ITEM_SELECTED,   self.OnItemSelected)
        self.Bind(wx.EVT_LIST_ITEM_DESELECTED, self.OnItemDeselected)
        self.Bind(wx.EVT_LIST_COL_CLICK,       self.OnColumnClick)     # sorting
        
    def Update(self, mapDBInfo):
        """Update list according new mapDBInfo description"""
        self.mapDBInfo = mapDBInfo
        self.LoadData(self.layer)

    def LoadData(self, layer, columns=None, where=None):
        """Load data into list

        @param layer layer number
        @param columns list of columns for output
        @param where where statement
        
        @return id of key column 
        @return -1 if key column is not displayed
        """
        self.log.write(_("Loading data..."))
        
        tableName    = self.mapDBInfo.layers[layer]['table']
        keyColumn    = self.mapDBInfo.layers[layer]['key']
        try:
            self.columns = self.mapDBInfo.tables[tableName]
        except KeyError:
            raise gcmd.DBMError(message=_("Attribute table <%s> not found. "
                                          "For creating the table switch to "
                                          "'Manage layers' tab.") % tableName,
                                parent=self.parent)
        
        if not columns:
            columns = self.mapDBInfo.GetColumns(tableName)
        else:
            all = self.mapDBInfo.GetColumns(tableName)
            for col in columns:
                if col not in all:
                    wx.MessageBox(parent=self,
                                  message=_("Column <%(column)s> not found in "
                                            "in the table <%(table)s>.") % \
                                      { 'column' : col, 'table' : tableName },
                                  caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
                    return
        
        try:
            # for maps connected via v.external
            keyId = columns.index(keyColumn)
        except:
            keyId = -1
        
        #
        # read data
        #
        # FIXME: Max. number of rows, while the GUI is still usable

        # stdout can be very large, do not use PIPE, redirect to temp file
        # TODO: more effective way should be implemented...
        outFile = tempfile.NamedTemporaryFile(mode='w+b')
        
        if columns:
            ret = gcmd.RunCommand('v.db.select',
                                  quiet = True,
                                  flags = 'c',
                                  map = self.mapDBInfo.map,
                                  layer = layer,
                                  columns = ','.join(columns),
                                  where = where,
                                  stdout=outFile)
        else:
           ret = gcmd.RunCommand('v.db.select',
                                 quiet = True,
                                 flags = 'c',
                                 map = self.mapDBInfo.map,
                                 layer = layer,
                                 where = where,
                                 stdout=outFile) 
        
        # These two should probably be passed to init more cleanly
        # setting the numbers of items = number of elements in the dictionary
        self.itemDataMap  = {}
        self.itemIndexMap = []
        self.itemCatsMap  = {}
        
        self.DeleteAllItems()
        
        # self.ClearAll()
        for i in range(self.GetColumnCount()):
            self.DeleteColumn(0)
        
        i = 0
        info = wx.ListItem()
        info.m_mask = wx.LIST_MASK_TEXT | wx.LIST_MASK_IMAGE | wx.LIST_MASK_FORMAT
        info.m_image = -1
        info.m_format = 0
        for column in columns:
            info.m_text = column
            self.InsertColumnInfo(i, info)
            i += 1
            
            if i >= 256:
                self.log.write(_("Can display only 256 columns."))
        
        i = 0
        outFile.seek(0)
        
        while True:
            # os.linesep doesn't work here (MSYS)
            record = outFile.readline().replace('\n', '')
            if not record:
                break
            
            self.itemDataMap[i] = []
            j = 0
            
            for value in record.split('|'):
                if self.columns[columns[j]]['ctype'] != type(''):
                    try:
                        ### casting disabled (2009/03)
                        ### self.itemDataMap[i].append(self.columns[columns[j]]['ctype'](value))
                        self.itemDataMap[i].append(value)
                    except ValueError:
                        self.itemDataMap[i].append(_('Unknown value'))
                else:
                    # encode string values
                    try:
                        self.itemDataMap[i].append(unicodeValue(value))
                    except UnicodeDecodeError:
                        self.itemDataMap[i].append(_("Unable to decode value. "
                                                     "Set encoding in GUI preferences ('Attributes')."))
                
                if keyId > -1 and keyId == j:
                    try:
                        cat = self.columns[columns[j]]['ctype'] (value)
                    except ValueError, e:
                        cat = -1
                        wx.MessageBox(parent=self,
                                      message=_("Error loading attribute data. "
                                                "Record number: %(rec)d. Unable to convert value '%(val)s' in "
                                                "key column (%(key)s) to integer.\n\n"
                                                "Details: %(detail)s") % \
                                          { 'rec' : i + 1, 'val' : value,
                                            'key' : keyColumn, 'detail' : e},
                                      caption=_("Error"),
                                      style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
                j += 1

            # insert to table
            # index = self.InsertStringItem(index=sys.maxint, label=str(self.itemDataMap[i][0]))
            # for j in range(len(self.itemDataMap[i][1:])):
            # self.SetStringItem(index=index, col=j+1, label=str(self.itemDataMap[i][j+1]))
                
            # self.SetItemData(item=index, data=i)
            
            self.itemIndexMap.append(i)
            if keyId > -1: # load cats only when LoadData() is called first time
                self.itemCatsMap[i] = cat

            i += 1
            if i >= 100000:
                self.log.write(_("Limit 100000 records."))
                break

        self.SetItemCount(i)
        
        i = 0
        for col in columns:
            width = self.columns[col]['length'] * 6 # FIXME
            if width < 60:
                width = 60
            if width > 300:
                width = 300
            self.SetColumnWidth(col=i, width=width)
            i += 1

        self.SendSizeEvent()

        self.log.write(_("Number of loaded records: %d") % \
                           self.GetItemCount())
        
        return keyId
    
    def OnItemSelected(self, event):
        """Item selected. Add item to selected cats..."""
        #         cat = int(self.GetItemText(event.m_itemIndex))
        #         if cat not in self.selectedCats:
        #             self.selectedCats.append(cat)
        #             self.selectedCats.sort()
        
        event.Skip()

    def OnItemDeselected(self, event):
        """Item deselected. Remove item from selected cats..."""
        #         cat = int(self.GetItemText(event.m_itemIndex))
        #         if cat in self.selectedCats:
        #             self.selectedCats.remove(cat)
        #             self.selectedCats.sort()

        event.Skip()

    def GetSelectedItems(self):
        """Return list of selected items (category numbers)"""
        cats = []
        item = self.GetFirstSelected()
        while item != -1:
            cats.append(self.GetItemText(item))
            item = self.GetNextSelected(item)

        return cats

    def GetColumnText(self, index, col):
        """Return column text"""
        item = self.GetItem(index, col)
        return item.GetText()

    def GetListCtrl(self):
        """Returt list"""
        return self

    def OnGetItemText(self, item, col):
        """Get item text"""
        index = self.itemIndexMap[item]
        s = self.itemDataMap[index][col]
        return s

    def OnGetItemAttr(self, item):
        """Get item attributes"""
        index = self.itemIndexMap[item]
        if ( index % 2) == 0:
            return self.attr2
        else:
            return self.attr1

    def OnColumnClick(self, event):
        """Column heading clicked -> sorting"""
        self._col = event.GetColumn()

        # remove duplicated arrow symbol from column header
        # FIXME: should be done automatically
        info = wx.ListItem()
        info.m_mask = wx.LIST_MASK_TEXT | wx.LIST_MASK_IMAGE
        info.m_image = -1
        for column in range(self.GetColumnCount()):
            info.m_text = self.GetColumn(column).GetText()
            self.SetColumn(column, info)

        event.Skip()

    def SortItems(self, sorter=cmp):
        """Sort items"""
        items = list(self.itemDataMap.keys())
        items.sort(self.Sorter)
        self.itemIndexMap = items

        # redraw the list
        self.Refresh()
        
    def Sorter(self, key1, key2):
        colName = self.GetColumn(self._col).GetText()
        ascending = self._colSortFlag[self._col]
        try:
            item1 = self.columns[colName]["ctype"](self.itemDataMap[key1][self._col])
            item2 = self.columns[colName]["ctype"](self.itemDataMap[key2][self._col])
        except ValueError:
            item1 = self.itemDataMap[key1][self._col]
            item2 = self.itemDataMap[key2][self._col]

        if type(item1) == type('') or type(item2) == type(''):
            cmpVal = locale.strcoll(str(item1), str(item2))
        else:
            cmpVal = cmp(item1, item2)


        # If the items are equal then pick something else to make the sort value unique
        if cmpVal == 0:
            cmpVal = apply(cmp, self.GetSecondarySortValues(self._col, key1, key2))

        if ascending:
            return cmpVal
        else:
            return -cmpVal

    def GetSortImages(self):
        """Used by the ColumnSorterMixin, see wx/lib/mixins/listctrl.py"""
        return (self.sm_dn, self.sm_up)

    def IsEmpty(self):
        """Check if list if empty"""
        if self.columns:
            return False
        
        return True
    
class AttributeManager(wx.Frame):
    """
    GRASS Attribute manager main window
    """
    def __init__(self, parent, id=wx.ID_ANY,
                 size = wx.DefaultSize, style = wx.DEFAULT_FRAME_STYLE,
                 title=None, vectorName=None, item=None, log=None):

        self.vectorName = vectorName
        self.parent     = parent # GMFrame
        self.treeItem   = item   # item in layer tree
        if self.parent and self.parent.GetName() == "LayerManager" and \
                self.treeItem and not self.vectorName:
            maptree = self.parent.curr_page.maptree
            name = maptree.GetPyData(self.treeItem)[0]['maplayer'].GetName()
            self.vectorName = name

        self.cmdLog     = log    # self.parent.goutput
        
        wx.Frame.__init__(self, parent, id, style=style)

        # title
        if not title:
            self.SetTitle("%s - <%s>" % (_("GRASS GIS Attribute Table Manager"),
                                         self.vectorName))
        else:
            self.SetTitle(title)
        
        # icon
        self.SetIcon(wx.Icon(os.path.join(globalvar.ETCICONDIR, 'grass_sql.ico'), wx.BITMAP_TYPE_ICO))

        self.panel = wx.Panel(parent=self, id=wx.ID_ANY)

        try:
            self.map        = self.parent.curr_page.maptree.Map
            self.mapdisplay = self.parent.curr_page.maptree.mapdisplay
        except:
            self.map = self.mapdisplay = None
        
        # status bar log class
        self.log = Log(self) # -> statusbar

        # query map layer (if parent (GMFrame) is given)
        self.qlayer = None

        # -> layers / tables description
        self.mapDBInfo = VectorDBInfo(self.vectorName)

        if len(self.mapDBInfo.layers.keys()) == 0:
            wx.MessageBox(parent=self.parent,
                          message=_("Database connection for vector map <%s> "
                                    "is not defined in DB file. "
                                    "You can define new connection in "
                                    "'Manage layers' tab.") % self.vectorName,
                          caption=_("Attribute Table Manager"),
                          style=wx.OK | wx.ICON_INFORMATION | wx.CENTRE)

        #
        # list of command/SQL statements to be performed
        #
        self.listOfCommands      = []
        self.listOfSQLStatements = []

        self.CreateStatusBar(number=1)

        # set up virtual lists (each layer)
        ### {layer: list, widgets...}
        self.layerPage = {}

        # auinotebook (browse, manage, settings)
        #self.notebook = wx.aui.AuiNotebook(parent=self, id=wx.ID_ANY,
        #                                   style=wx.aui.AUI_NB_BOTTOM)
        # really needed (ML)
        # self.notebook.SetFont(wx.Font(10, wx.FONTFAMILY_MODERN, wx.NORMAL, wx.NORMAL, 0, ''))

        self.notebook = FN.FlatNotebook(parent=self.panel, id=wx.ID_ANY,
                                        style=FN.FNB_BOTTOM |
                                        FN.FNB_NO_NAV_BUTTONS |
                                        FN.FNB_FANCY_TABS | FN.FNB_NO_X_BUTTON)

        dbmStyle = globalvar.FNPageStyle

        self.browsePage = FN.FlatNotebook(self.panel, id=wx.ID_ANY,
                                          style=dbmStyle)
        # self.notebook.AddPage(self.browsePage, caption=_("Browse data"))
        self.notebook.AddPage(self.browsePage, text=_("Browse data")) # FN
        self.browsePage.SetTabAreaColour(globalvar.FNPageColor)

        self.manageTablePage = FN.FlatNotebook(self.panel, id=wx.ID_ANY,
                                          style=dbmStyle)
        #self.notebook.AddPage(self.manageTablePage, caption=_("Manage tables"))
        self.notebook.AddPage(self.manageTablePage, text=_("Manage tables")) # FN
        self.manageTablePage.SetTabAreaColour(globalvar.FNPageColor)

        self.manageLayerPage = FN.FlatNotebook(self.panel, id=wx.ID_ANY,
                                               style=dbmStyle)
        #self.notebook.AddPage(self.manageLayerPage, caption=_("Manage layers"))
        self.notebook.AddPage(self.manageLayerPage, text=_("Manage layers")) # FN
        self.manageLayerPage.SetTabAreaColour(globalvar.FNPageColor)
        
        self.__createBrowsePage()
        self.__createManageTablePage()
        self.__createManageLayerPage()

        self.notebook.SetSelection(0) # select browse tab

        #
        # buttons
        #
        self.btnQuit       = wx.Button(parent=self.panel, id=wx.ID_EXIT)

        # events
        self.btnQuit.Bind(wx.EVT_BUTTON,            self.OnCloseWindow)
        self.notebook.Bind(FN.EVT_FLATNOTEBOOK_PAGE_CHANGED, self.OnPageChanged)
        self.Bind(FN.EVT_FLATNOTEBOOK_PAGE_CHANGED, self.OnLayerPageChanged, self.browsePage)
        self.Bind(FN.EVT_FLATNOTEBOOK_PAGE_CHANGED, self.OnLayerPageChanged, self.manageTablePage)
        
        # do layout
        self.__layout()

        # self.SetMinSize(self.GetBestSize())
        self.SetSize((680, 550)) # FIXME hard-coded size
        self.SetMinSize(self.GetSize())

    def __createBrowsePage(self, onlyLayer=-1):
        """Create browse tab page"""
        for layer in self.mapDBInfo.layers.keys():
            if onlyLayer > 0 and layer != onlyLayer:
                continue

            panel = wx.Panel(parent=self.browsePage, id=wx.ID_ANY)
            
            #IMPORTANT NOTE: wx.StaticBox MUST be defined BEFORE any of the 
            #   controls that are placed IN the wx.StaticBox, or it will freeze
            #   on the Mac
            
            listBox = wx.StaticBox(parent=panel, id=wx.ID_ANY,
                       label=" %s " % _("Attribute data - right-click to edit/manage records"))
            listSizer = wx.StaticBoxSizer(listBox, wx.VERTICAL)
            
            win = VirtualAttributeList(panel, self.log,
                                       self.mapDBInfo, layer)
            if win.IsEmpty():
                del panel
                continue
            
            win.Bind(wx.EVT_LIST_ITEM_ACTIVATED, self.OnDataItemActivated)

            self.layerPage[layer] = {'browsePage': panel.GetId()}

            self.browsePage.AddPage(page=panel, text=" %d / %s %s" % \
                                        (layer, _("Table"), self.mapDBInfo.layers[layer]['table']))

            pageSizer = wx.BoxSizer(wx.VERTICAL)

            # attribute data            
            sqlBox = wx.StaticBox(parent=panel, id=wx.ID_ANY,
                                  label=" %s " % _("SQL Query"))

            sqlSizer = wx.StaticBoxSizer(sqlBox, wx.VERTICAL)

            win.Bind(wx.EVT_COMMAND_RIGHT_CLICK, self.OnDataRightUp) #wxMSW
            win.Bind(wx.EVT_RIGHT_UP,            self.OnDataRightUp) #wxGTK
            if UserSettings.Get(group='atm', key='leftDbClick', subkey='selection') == 0:
                win.Bind(wx.EVT_LEFT_DCLICK, self.OnDataItemEdit)
                win.Bind(wx.EVT_COMMAND_LEFT_DCLICK, self.OnDataItemEdit)
            else:
                win.Bind(wx.EVT_LEFT_DCLICK, self.OnDataDrawSelected)
                win.Bind(wx.EVT_COMMAND_LEFT_DCLICK, self.OnDataDrawSelected)
                
            
            listSizer.Add(item=win, proportion=1,
                          flag=wx.EXPAND | wx.ALL,
                          border=3)

            # sql statement box
            btnApply = wx.Button(parent=panel, id=wx.ID_APPLY)
            btnApply.SetToolTipString(_("Apply SELECT statement and reload data records"))
            btnApply.Bind(wx.EVT_BUTTON, self.OnApplySqlStatement)
            btnSqlBuilder = wx.Button(parent=panel, id=wx.ID_ANY, label=_("SQL Builder"))
            btnSqlBuilder.Bind(wx.EVT_BUTTON, self.OnBuilder)

            sqlSimple = wx.RadioButton(parent=panel, id=wx.ID_ANY,
                                       label=_("Simple"))
            sqlSimple.SetValue(True)
            sqlAdvanced = wx.RadioButton(parent=panel, id=wx.ID_ANY,
                                         label=_("Advanced"))
            sqlSimple.Bind(wx.EVT_RADIOBUTTON,   self.OnChangeSql)
            sqlAdvanced.Bind(wx.EVT_RADIOBUTTON, self.OnChangeSql)

            sqlWhereColumn = wx.Choice(parent=panel, id=wx.ID_ANY,
                                       size=(100,-1),
                                       choices=self.mapDBInfo.GetColumns(self.mapDBInfo.layers[layer]['table']))
            sqlWhereValue = wx.TextCtrl(parent=panel, id=wx.ID_ANY, value="",
                                        style=wx.TE_PROCESS_ENTER)

            sqlStatement = wx.TextCtrl(parent=panel, id=wx.ID_ANY,
                                       value="SELECT * FROM %s" % \
                                           self.mapDBInfo.layers[layer]['table'],
                                       style=wx.TE_PROCESS_ENTER)
            sqlWhereValue.Bind(wx.EVT_TEXT_ENTER, self.OnApplySqlStatement)
            sqlStatement.Bind(wx.EVT_TEXT_ENTER, self.OnApplySqlStatement)

            sqlLabel = wx.StaticText(parent=panel, id=wx.ID_ANY,
                                     label="SELECT * FROM %s WHERE " % \
                                         self.mapDBInfo.layers[layer]['table'])
            label_query = wx.StaticText(parent=panel, id=wx.ID_ANY,
                                        label="")

            sqlFlexSizer = wx.FlexGridSizer (cols=3, hgap=5, vgap=5)
            sqlFlexSizer.AddGrowableCol(1)

            sqlFlexSizer.Add(item=sqlSimple,
                             flag=wx.ALIGN_CENTER_VERTICAL)
            sqlSimpleSizer = wx.BoxSizer(wx.HORIZONTAL)
            sqlSimpleSizer.Add(item=sqlLabel,
                               flag=wx.ALIGN_CENTER_VERTICAL)
            sqlSimpleSizer.Add(item=sqlWhereColumn,
                               flag=wx.EXPAND | wx.ALIGN_CENTER_VERTICAL)
            sqlSimpleSizer.Add(item=sqlWhereValue, proportion=1,
                               flag=wx.EXPAND | wx.ALIGN_CENTER_VERTICAL)
            sqlFlexSizer.Add(item=sqlSimpleSizer,
                             flag=wx.ALIGN_CENTER_VERTICAL | wx.EXPAND)
            sqlFlexSizer.Add(item=btnApply,
                             flag=wx.ALIGN_RIGHT)
            sqlFlexSizer.Add(item=sqlAdvanced,
                             flag=wx.ALIGN_CENTER_VERTICAL)
            sqlFlexSizer.Add(item=sqlStatement,
                             flag=wx.EXPAND)
            sqlFlexSizer.Add(item=btnSqlBuilder,
                             flag=wx.ALIGN_RIGHT)

            sqlSizer.Add(item=sqlFlexSizer,
                         flag=wx.ALL | wx.EXPAND,
                         border=3)

            pageSizer.Add(item=listSizer,
                          proportion=1,
                          flag=wx.ALL | wx.EXPAND,
                          border=5)

            pageSizer.Add(item=sqlSizer,
                          proportion=0,
                          flag=wx.BOTTOM | wx.LEFT | wx.RIGHT | wx.EXPAND,
                          border=5)

            panel.SetSizer(pageSizer)

            self.layerPage[layer]['data']      = win.GetId()
            self.layerPage[layer]['simple']    = sqlSimple.GetId()
            self.layerPage[layer]['advanced']  = sqlAdvanced.GetId()
            self.layerPage[layer]['whereColumn'] = sqlWhereColumn.GetId()
            self.layerPage[layer]['where']     = sqlWhereValue.GetId()
            self.layerPage[layer]['builder']   = btnSqlBuilder.GetId()
            self.layerPage[layer]['statement'] = sqlStatement.GetId()


        self.browsePage.SetSelection(0) # select first layer
        try:
            self.layer = self.mapDBInfo.layers.keys()[0]
            self.OnChangeSql(None)
            self.log.write(_("Number of loaded records: %d") % \
                           self.FindWindowById(self.layerPage[self.layer]['data']).GetItemCount())
        except (IndexError, KeyError):
            self.layer = None
        
    def __createManageTablePage(self, onlyLayer=-1):
        """Create manage page (create/link and alter tables)"""
        for layer in self.mapDBInfo.layers.keys():
            if onlyLayer > 0 and layer != onlyLayer:
                continue
            
            if not self.layerPage.has_key(layer):
                continue
            
            panel = wx.Panel(parent=self.manageTablePage, id=wx.ID_ANY)
            self.layerPage[layer]['tablePage'] = panel.GetId()
            self.manageTablePage.AddPage(page=panel,
                                         text=" %d / %s %s" % (layer,
                                                               _("Table"),
                                                               self.mapDBInfo.layers[layer]['table']))
            
            pageSizer = wx.BoxSizer(wx.VERTICAL)
            
            #
            # dbInfo
            #
            dbBox = wx.StaticBox(parent=panel, id=wx.ID_ANY,
                                          label=" %s " % _("Database connection"))
            dbSizer = wx.StaticBoxSizer(dbBox, wx.VERTICAL)
            dbSizer.Add(item=self.__createDbInfoDesc(panel, layer),
                        proportion=1,
                        flag=wx.EXPAND | wx.ALL,
                        border=3)
            
            #
            # table description
            #
            table = self.mapDBInfo.layers[layer]['table']
            tableBox = wx.StaticBox(parent=panel, id=wx.ID_ANY,
                                    label=" %s " % _("Table <%s> - right-click to delete column(s)") % table)
            
            tableSizer = wx.StaticBoxSizer(tableBox, wx.VERTICAL)
            
            list = self.__createTableDesc(panel, table)
            list.Bind(wx.EVT_COMMAND_RIGHT_CLICK, self.OnTableRightUp) #wxMSW
            list.Bind(wx.EVT_RIGHT_UP,            self.OnTableRightUp) #wxGTK
            self.layerPage[layer]['tableData'] = list.GetId()
            
            #
            # add column
            #
            columnBox = wx.StaticBox(parent=panel, id=wx.ID_ANY,
                                     label=" %s " % _("Manage columns"))
            
            columnSizer = wx.StaticBoxSizer(columnBox, wx.VERTICAL)
            
            addSizer = wx.FlexGridSizer (cols=5, hgap=3, vgap=3)
            addSizer.AddGrowableCol(3)
            
            label  = wx.StaticText(parent=panel, id=wx.ID_ANY, label=_("Column name"))
            column = wx.TextCtrl(parent=panel, id=wx.ID_ANY, value='',
                                 size=(150, -1), style=wx.TE_PROCESS_ENTER)
            column.Bind(wx.EVT_TEXT,       self.OnTableAddColumnName)
            column.Bind(wx.EVT_TEXT_ENTER, self.OnTableItemAdd)
            self.layerPage[layer]['addColName'] = column.GetId()
            addSizer.Add(item=label,
                         flag=wx.ALIGN_CENTER_VERTICAL)
            addSizer.Add(item=column,
                         flag=wx.ALIGN_CENTER_VERTICAL)
            # data type
            label  = wx.StaticText(parent=panel, id=wx.ID_ANY, label=_("Data type"))
            addSizer.Add(item=label,
                         flag=wx.ALIGN_CENTER_VERTICAL)
            
            subSizer = wx.BoxSizer(wx.HORIZONTAL)
            type = wx.Choice (parent=panel, id=wx.ID_ANY,
                              choices = ["integer",
                                         "double",
                                         "varchar",
                                         "date"]) # FIXME
            type.SetSelection(0)
            type.Bind(wx.EVT_CHOICE, self.OnTableChangeType)
            self.layerPage[layer]['addColType'] = type.GetId()
            subSizer.Add(item=type,
                         flag=wx.ALIGN_CENTER_VERTICAL | wx.LEFT | wx.RIGHT,
                         border=3)
            # length
            label  = wx.StaticText(parent=panel, id=wx.ID_ANY, label=_("Data length"))
            length = wx.SpinCtrl(parent=panel, id=wx.ID_ANY, size=(65, -1),
                                 initial=250,
                                 min=1, max=1e6)
            length.Enable(False)
            self.layerPage[layer]['addColLength'] = length.GetId()
            subSizer.Add(item=label,
                         flag=wx.ALIGN_CENTER_VERTICAL | wx.LEFT | wx.RIGHT,
                         border=3)
            subSizer.Add(item=length,
                         flag=wx.ALIGN_CENTER_VERTICAL | wx.LEFT | wx.RIGHT,
                         border=3)
            
            addSizer.Add(item=subSizer,
                         flag=wx.ALIGN_CENTER_VERTICAL | wx.LEFT | wx.RIGHT,
                         border=3)
            
            btnAddCol = wx.Button(parent=panel, id=wx.ID_ANY, label=_("Add"))
            btnAddCol.Bind(wx.EVT_BUTTON, self.OnTableItemAdd)
            btnAddCol.Enable(False)
            self.layerPage[layer]['addColButton'] = btnAddCol.GetId()
            addSizer.Add(item=btnAddCol,
                         proportion=0,
                         flag=wx.EXPAND | wx.ALIGN_RIGHT | wx.FIXED_MINSIZE |
                         wx.ALIGN_CENTER_VERTICAL )
            
            # rename col
            label  = wx.StaticText(parent=panel, id=wx.ID_ANY, label=_("Rename column"))
            column = wx.ComboBox(parent=panel, id=wx.ID_ANY, size=(150, -1),
                                 style=wx.CB_SIMPLE | wx.CB_READONLY,
                                 choices=self.mapDBInfo.GetColumns(table))
            column.SetSelection(0)
            self.layerPage[layer]['renameCol'] = column.GetId()
            addSizer.Add(item=label,
                         flag=wx.ALIGN_CENTER_VERTICAL)
            addSizer.Add(item=column,
                         flag=wx.ALIGN_CENTER_VERTICAL)
            label  = wx.StaticText(parent=panel, id=wx.ID_ANY, label=_("To"))
            columnTo = wx.TextCtrl(parent=panel, id=wx.ID_ANY, value='',
                                   size=(150, -1), style=wx.TE_PROCESS_ENTER)
            columnTo.Bind(wx.EVT_TEXT,       self.OnTableRenameColumnName)
            columnTo.Bind(wx.EVT_TEXT_ENTER, self.OnTableItemChange)
            self.layerPage[layer]['renameColTo'] = columnTo.GetId()
            addSizer.Add(item=label,
                         flag=wx.ALIGN_CENTER_VERTICAL | wx.ALIGN_CENTER)
            addSizer.Add(item=columnTo,
                         flag=wx.ALIGN_CENTER_VERTICAL)
            btnRenameCol = wx.Button(parent=panel, id=wx.ID_ANY, label=_("&Rename"))
            btnRenameCol.Bind(wx.EVT_BUTTON, self.OnTableItemChange)
            btnRenameCol.Enable(False)
            self.layerPage[layer]['renameColButton'] = btnRenameCol.GetId()
            
            addSizer.Add(item=btnRenameCol,
                         proportion=0,
                         flag=wx.EXPAND | wx.ALIGN_RIGHT | wx.FIXED_MINSIZE |
                         wx.ALIGN_CENTER_VERTICAL)

            columnSizer.Add(item=addSizer, proportion=1,
                            flag=wx.ALL | wx.EXPAND, border=3)
            
            tableSizer.Add(item=list,
                           flag=wx.ALL | wx.EXPAND,
                           proportion=1,
                           border=3)
            
            pageSizer.Add(item=dbSizer,
                          flag=wx.ALL | wx.EXPAND,
                          proportion=0,
                          border=3)
            
            pageSizer.Add(item=tableSizer,
                          flag=wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.EXPAND,
                          proportion=1,
                          border=3)
 
            pageSizer.Add(item=columnSizer,
                          flag=wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.EXPAND,
                          proportion=0,
                          border=3)
            
            panel.SetSizer(pageSizer)
        
        self.manageTablePage.SetSelection(0) # select first layer
        try:
            self.layer = self.mapDBInfo.layers.keys()[0]
        except IndexError:
            self.layer = None
        
    def __createTableDesc(self, parent, table):
        """Create list with table description"""
        list = TableListCtrl(parent=parent, id=wx.ID_ANY,
                             table=self.mapDBInfo.tables[table],
                             columns=self.mapDBInfo.GetColumns(table))
        list.Populate()
        # sorter
        # itemDataMap = list.Populate()
        # listmix.ColumnSorterMixin.__init__(self, 2)

        return list

    def __createManageLayerPage(self):
        """Create manage page"""
        splitterWin = wx.SplitterWindow(parent=self.manageLayerPage, id=wx.ID_ANY)
        splitterWin.SetMinimumPaneSize(100)
        
        self.manageLayerPage.AddPage(page=splitterWin,
                                     text=_("Layers of vector map")) # dummy page
        
        #
        # list of layers
        #
        panelList = wx.Panel(parent=splitterWin, id=wx.ID_ANY)

        panelListSizer  = wx.BoxSizer(wx.VERTICAL)
        layerBox = wx.StaticBox(parent=panelList, id=wx.ID_ANY,
                                label=" %s " % _("List of layers"))
        layerSizer = wx.StaticBoxSizer(layerBox, wx.VERTICAL)

        self.layerList = self.__createLayerDesc(panelList)
        self.layerList.Bind(wx.EVT_COMMAND_RIGHT_CLICK, self.OnLayerRightUp) #wxMSW
        self.layerList.Bind(wx.EVT_RIGHT_UP,            self.OnLayerRightUp) #wxGTK
        
        layerSizer.Add(item=self.layerList,
                       flag=wx.ALL | wx.EXPAND,
                       proportion=1,
                       border=3)

        panelListSizer.Add(item=layerSizer,
                           flag=wx.ALL | wx.EXPAND,
                           proportion=1,
                           border=3)

        panelList.SetSizer(panelListSizer)

        #
        # manage part
        #
        panelManage = wx.Panel(parent=splitterWin, id=wx.ID_ANY)
         
        manageSizer = wx.BoxSizer(wx.VERTICAL)

        self.manageLayerBook = LayerBook(parent=panelManage, id=wx.ID_ANY,
                                         parentDialog=self)

        manageSizer.Add(item=self.manageLayerBook,
                        proportion=1,
                        flag=wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.EXPAND,
                        border=5)

        panelManage.SetSizer(manageSizer)
        splitterWin.SplitHorizontally(panelList, panelManage, 100) 
        splitterWin.Fit()

    def __createLayerDesc(self, parent):
        """Create list of linked layers"""
        list = LayerListCtrl(parent=parent, id=wx.ID_ANY,
                             layers=self.mapDBInfo.layers)
        
        list.Populate()
        # sorter
        # itemDataMap = list.Populate()
        # listmix.ColumnSorterMixin.__init__(self, 2)

        return list

    def __layout(self):
        """Do layout"""
        # frame body
        mainSizer = wx.BoxSizer(wx.VERTICAL)

        # buttons
        btnSizer = wx.BoxSizer(wx.HORIZONTAL)
        btnSizer.Add(item=self.btnQuit, proportion=1,
                     flag=wx.ALL | wx.ALIGN_RIGHT | wx.SHAPED, border=5)
        # btnSizer.Add(item=self.btnApply,
        #             flag=wx.ALL, border=5)

        mainSizer.Add(item=self.notebook, proportion=1, flag=wx.EXPAND)
        mainSizer.Add(item=btnSizer, proportion=0, flag=wx.EXPAND | wx.ALL, border=5)

        self.panel.SetAutoLayout(True)
        self.panel.SetSizer(mainSizer)
        mainSizer.Fit(self.panel)
        self.Layout()
        
    def OnDataRightUp(self, event):
        """Table description area, context menu"""
        if not hasattr(self, "popupDataID1"):
            self.popupDataID1 = wx.NewId()
            self.popupDataID2 = wx.NewId()
            self.popupDataID3 = wx.NewId()
            self.popupDataID4 = wx.NewId()
            self.popupDataID5 = wx.NewId()
            self.popupDataID6 = wx.NewId()
            self.popupDataID7 = wx.NewId()
            self.popupDataID8 = wx.NewId()
            self.popupDataID9 = wx.NewId()
            self.popupDataID10 = wx.NewId()
            self.popupDataID11 = wx.NewId()

            self.Bind(wx.EVT_MENU, self.OnDataItemEdit,       id=self.popupDataID1)
            self.Bind(wx.EVT_MENU, self.OnDataItemAdd,        id=self.popupDataID2)
            self.Bind(wx.EVT_MENU, self.OnDataItemDelete,     id=self.popupDataID3)
            self.Bind(wx.EVT_MENU, self.OnDataItemDeleteAll,  id=self.popupDataID4)
            self.Bind(wx.EVT_MENU, self.OnDataSelectAll,      id=self.popupDataID5)
            self.Bind(wx.EVT_MENU, self.OnDataSelectNone,     id=self.popupDataID6)
            self.Bind(wx.EVT_MENU, self.OnDataDrawSelected,   id=self.popupDataID7)
            self.Bind(wx.EVT_MENU, self.OnDataDrawSelectedZoom, id=self.popupDataID8)
            self.Bind(wx.EVT_MENU, self.OnExtractSelected,    id=self.popupDataID9)
            self.Bind(wx.EVT_MENU, self.OnDeleteSelected,     id=self.popupDataID11)
            self.Bind(wx.EVT_MENU, self.OnDataReload,         id=self.popupDataID10)

        list = self.FindWindowById(self.layerPage[self.layer]['data'])
        # generate popup-menu
        menu = wx.Menu()
        menu.Append(self.popupDataID1, _("Edit selected record"))
        selected = list.GetFirstSelected()
        if selected == -1 or list.GetNextSelected(selected) != -1:
            menu.Enable(self.popupDataID1, False)
        menu.Append(self.popupDataID2, _("Insert new record"))
        menu.Append(self.popupDataID3, _("Delete selected record(s)"))
        menu.Append(self.popupDataID4, _("Delete all records"))
        menu.AppendSeparator()
        menu.Append(self.popupDataID5, _("Select all"))
        menu.Append(self.popupDataID6, _("Deselect all"))
        menu.AppendSeparator()
        menu.Append(self.popupDataID7, _("Highlight selected features"))
        menu.Append(self.popupDataID8, _("Highlight selected features and zoom"))
        if not self.map or len(list.GetSelectedItems()) == 0:
            menu.Enable(self.popupDataID7, False)
            menu.Enable(self.popupDataID8, False)
        menu.Append(self.popupDataID9, _("Extract selected features"))
        menu.Append(self.popupDataID11, _("Delete selected features"))
        if list.GetFirstSelected() == -1:
            menu.Enable(self.popupDataID3, False)
            menu.Enable(self.popupDataID9, False)
            menu.Enable(self.popupDataID11, False)
        menu.AppendSeparator()
        menu.Append(self.popupDataID10, _("Reload"))

        self.PopupMenu(menu)
        menu.Destroy()

        # update statusbar
        self.log.write(_("Number of loaded records: %d") % \
                           list.GetItemCount())

    def OnDataItemDelete(self, event):
        """Delete selected item(s) from the list (layer/category pair)"""
        list = self.FindWindowById(self.layerPage[self.layer]['data'])
        item = list.GetFirstSelected()

        table    = self.mapDBInfo.layers[self.layer]["table"]
        key      = self.mapDBInfo.layers[self.layer]["key"]

        indeces = []
        # collect SQL statements
        while item != -1:
            index = list.itemIndexMap[item]
            indeces.append(index)

            cat = list.itemCatsMap[index]
            
            self.listOfSQLStatements.append('DELETE FROM %s WHERE %s=%d' % \
                                                (table, key, cat))

            item = list.GetNextSelected(item)

        if UserSettings.Get(group='atm', key='askOnDeleteRec', subkey='enabled'):
            deleteDialog = wx.MessageBox(parent=self,
                                         message=_("Selected data records (%d) will permanently deleted "
                                                   "from table. Do you want to delete them?") % \
                                             (len(self.listOfSQLStatements)),
                                         caption=_("Delete records"),
                                         style=wx.YES_NO | wx.CENTRE)
            if deleteDialog != wx.YES:
                self.listOfSQLStatements = []
                return False

        # restore maps
        i = 0
        indexTemp = copy.copy(list.itemIndexMap)
        list.itemIndexMap = []
        dataTemp = copy.deepcopy(list.itemDataMap)
        list.itemDataMap = {}
        catsTemp = copy.deepcopy(list.itemCatsMap)
        list.itemCatsMap = {}

        i = 0
        for index in indexTemp:
            if index in indeces:
                continue
            list.itemIndexMap.append(i)
            list.itemDataMap[i] = dataTemp[index]
            list.itemCatsMap[i] = catsTemp[index]

            i += 1
            
        list.SetItemCount(len(list.itemIndexMap))

        # deselect items
        item = list.GetFirstSelected()
        while item != -1:
            list.SetItemState(item, 0, wx.LIST_STATE_SELECTED | wx.LIST_STATE_FOCUSED)
            item = list.GetNextSelected(item)
        
        # submit SQL statements
        self.ApplyCommands()
        
        return True

    def OnDataItemDeleteAll(self, event):
        """Delete all items from the list"""
        list = self.FindWindowById(self.layerPage[self.layer]['data'])
        if UserSettings.Get(group='atm', key='askOnDeleteRec', subkey='enabled'):
            deleteDialog = wx.MessageBox(parent=self,
                                         message=_("All data records (%d) will permanently deleted "
                                                   "from table. Do you want to delete them?") % \
                                             (len(list.itemIndexMap)),
                                         caption=_("Delete records"),
                                         style=wx.YES_NO | wx.CENTRE)
            if deleteDialog != wx.YES:
                return

        list.DeleteAllItems()
        list.itemDataMap  = {}
        list.itemIndexMap = []
        list.SetItemCount(0)

        table = self.mapDBInfo.layers[self.layer]["table"]
        self.listOfSQLStatements.append('DELETE FROM %s' % table)

        self.ApplyCommands()
        
        event.Skip()

    def _drawSelected(self, zoom):
        """Highlight selected features"""
        if not self.map or not self.mapdisplay:
            return
        
        list = self.FindWindowById(self.layerPage[self.layer]['data'])
        cats = map(int, list.GetSelectedItems())

        digitToolbar = self.mapdisplay.toolbars['vdigit']
        if digitToolbar and digitToolbar.GetLayer() and \
                digitToolbar.GetLayer().GetName() == self.vectorName:

            self.mapdisplay.digit.driver.SetSelected(cats, field=self.layer)
            if zoom:
                n, s, w, e = self.mapdisplay.digit.driver.GetRegionSelected()
                self.mapdisplay.Map.GetRegion(n=n, s=s, w=w, e=e,
                                              update=True)
        else:
            # add map layer with higlighted vector features
            self.AddQueryMapLayer() # -> self.qlayer

            # set opacity based on queried layer
            if self.parent and self.parent.GetName() == "LayerManager" and \
                    self.treeItem:
                maptree = self.parent.curr_page.maptree
                opacity = maptree.GetPyData(self.treeItem)[0]['maplayer'].GetOpacity(float=True)
                self.qlayer.SetOpacity(opacity)
            if zoom:
                keyColumn = self.mapDBInfo.layers[self.layer]['key']
                where = ''
                for range in utils.ListOfCatsToRange(cats).split(','):
                    if '-' in range:
                        min, max = range.split('-')
                        where += '%s >= %d and %s <= %d or ' % \
                            (keyColumn, int(min),
                             keyColumn, int(max))
                    else:
                        where += '%s = %d or ' % (keyColumn, int(range))
                where = where.rstrip('or ')
                
                select = gcmd.RunCommand('v.db.select',
                                         parent = self,
                                         read = True,
                                         quiet = True,
                                         flags = 'r',
                                         map = self.mapDBInfo.map,
                                         layer = int(self.layer),
                                         where = where)
                
                region = {}
                for line in select.splitlines():
                    key, value = line.split('=')
                    region[key.strip()] = float(value.strip())
                
                self.mapdisplay.Map.GetRegion(n=region['n'], s=region['s'],
                                              w=region['w'], e=region['e'],
                                              update=True)
        
        if zoom:
            self.mapdisplay.Map.AdjustRegion() # adjust resolution
            self.mapdisplay.Map.AlignExtentFromDisplay() # adjust extent
            self.mapdisplay.MapWindow.UpdateMap(render=True, renderVector=True)
        else:
            self.mapdisplay.MapWindow.UpdateMap(render=False, renderVector=True)
        
    def OnDataDrawSelected(self, event):
        """Reload table description"""
        self._drawSelected(zoom=False)
        event.Skip()

    def OnDataDrawSelectedZoom(self, event):
        self._drawSelected(zoom=True)
        event.Skip()
        
    def OnDataItemAdd(self, event):
        """Add new record to the attribute table"""
        list      = self.FindWindowById(self.layerPage[self.layer]['data'])
        table     = self.mapDBInfo.layers[self.layer]['table']
        keyColumn = self.mapDBInfo.layers[self.layer]['key']
        
        # (column name, value)
        data = []

        # collect names of all visible columns
        columnName = []
        for i in range(list.GetColumnCount()): 
            columnName.append(list.GetColumn(i).GetText())

        # maximal category number
        if len(list.itemCatsMap.values()) > 0:
            maxCat = max(list.itemCatsMap.values())
        else:
            maxCat = 0 # starting category '1'
        
        # key column must be always presented
        if keyColumn not in columnName:
            columnName.insert(0, keyColumn) # insert key column on first position
            data.append((keyColumn, str(maxCat + 1)))
            missingKey = True
        else:
            missingKey = False
            
        # add other visible columns
        colIdx = 0
        keyId = -1
        for col in columnName:
            if col == keyColumn: # key 
                if missingKey is False: 
                    data.append((col, str(maxCat + 1)))
                    keyId = colIdx
            else:
                data.append((col, ''))
            colIdx += 1
                
        dlg = ModifyTableRecord(parent=self, id=wx.ID_ANY,
                                title=_("Insert new record"),
                                data=data, keyEditable=(keyId, True))

        if dlg.ShowModal() == wx.ID_OK:
            try: # get category number
                cat = int(dlg.GetValues(columns=[keyColumn])[0])
            except:
                cat = -1

            try:
                if cat in list.itemCatsMap.values():
                    raise ValueError(_("Record with category number %d "
                                       "already exists in the table.") % cat)

                values = dlg.GetValues() # values (need to be casted)
                columnsString = ''
                valuesString   = ''
                
                for i in range(len(values)):
                    if len(values[i]) == 0: # NULL
                        if columnName[i] == keyColumn:
                            raise ValueError(_("Category number (column %s)"
                                               " is missing.") % keyColumn)
                        else:
                            continue

                    try:
                        if list.columns[columnName[i]]['ctype'] == int:
                            # values[i] is stored as text. 
                            value = float(values[i])
                        else:
                            value = values[i]
                        values[i] = list.columns[columnName[i]]['ctype'] (value)

                    except:
                        raise ValueError(_("Value '%(value)s' needs to be entered as %(type)s.") % 
                                         {'value' : str(values[i]),
                                          'type' : list.columns[columnName[i]]['type']})
                    columnsString += '%s,' % columnName[i]
                    if list.columns[columnName[i]]['ctype'] == str:
                        valuesString += "'%s'," % values[i]
                    else:
                        valuesString += "%s," % values[i]

            except ValueError, err:
                wx.MessageBox(parent=self,
                              message="%s%s%s" % (_("Unable to insert new record."),
                                                    os.linesep, err),
                              caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
                return

            # remove category if need 
            if missingKey is True:
                del values[0]
                
            # add new item to the list
            if len(list.itemIndexMap) > 0:
                index = max(list.itemIndexMap) + 1
            else:
                index = 0
            
            list.itemIndexMap.append(index)
            list.itemDataMap[index] = values
            list.itemCatsMap[index] = cat
            list.SetItemCount(list.GetItemCount() + 1)

            self.listOfSQLStatements.append('INSERT INTO %s (%s) VALUES(%s)' % \
                                                (table,
                                                 columnsString.strip(','),
                                                 valuesString.strip(',')))
            self.ApplyCommands()
            
    def OnDataItemEdit(self, event):
        """Edit selected record of the attribute table"""
        list      = self.FindWindowById(self.layerPage[self.layer]['data'])
        item      = list.GetFirstSelected()
        if item == -1:
            return

        table     = self.mapDBInfo.layers[self.layer]['table']
        keyColumn = self.mapDBInfo.layers[self.layer]['key']
        cat       = list.itemCatsMap[list.itemIndexMap[item]]

        # (column name, value)
        data = []

        # collect names of all visible columns
        columnName = []
        for i in range(list.GetColumnCount()): 
            columnName.append(list.GetColumn(i).GetText())


        # key column must be always presented
        if keyColumn not in columnName:
            columnName.insert(0, keyColumn) # insert key column on first position
            data.append((keyColumn, str(cat)))
            keyId = 0
            missingKey = True
        else:
            missingKey = False
            
        # add other visible columns
        for i in range(len(columnName)):
            if columnName[i] == keyColumn: # key 
                if missingKey is False: 
                    data.append((columnName[i], str(cat)))
                    keyId = i
            else:
                if missingKey is True:
                    value = list.GetItem(item, i-1).GetText()
                else:
                    value = list.GetItem(item, i).GetText()
                data.append((columnName[i], value))

        dlg = ModifyTableRecord(parent=self, id=wx.ID_ANY,
                                title=_("Update existing record"),
                                data=data, keyEditable=(keyId, False))

        if dlg.ShowModal() == wx.ID_OK:
            values = dlg.GetValues() # string
            updateString = ''
            try:
                for i in range(len(values)): 
                    if i == keyId: # skip key column
                        continue
                    if list.GetItem(item, i).GetText() != values[i]:
                        if len(values[i]) > 0:
                            try:
                                if missingKey is True:
                                    idx = i - 1
                                else:
                                    idx = i
                                if list.columns[columnName[i]]['ctype'] != type(''):
                                    if list.columns[columnName[i]]['ctype'] == int:
                                        value = float(values[i])
                                    else:
                                        value = values[i]
                                    list.itemDataMap[item][idx] = \
                                        list.columns[columnName[i]]['ctype'] (value)
                                else:
                                    list.itemDataMap[item][idx] = values[i]
                            except:
                                raise ValueError(_("Value '%(value)s' needs to be entered as %(type)s.") % \
                                                     {'value' : str(values[i]),
                                                      'type' : list.columns[columnName[i]]['type']})

                            if list.columns[columnName[i]]['ctype'] == str:
                                updateString += "%s='%s'," % (columnName[i], values[i])
                            else:
                                updateString += "%s=%s," % (columnName[i], values[i])
                        else: # NULL
                            updateString += "%s=NULL," % (columnName[i])
                            
            except ValueError, err:
                wx.MessageBox(parent=self,
                              message="%s%s%s" % (_("Unable to update existing record."),
                                                  os.linesep, err),
                              caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
                return
            
            if len(updateString) > 0:
                self.listOfSQLStatements.append('UPDATE %s SET %s WHERE %s=%d' % \
                                                    (table, updateString.strip(','),
                                                     keyColumn, cat))
                self.ApplyCommands()

            list.Update(self.mapDBInfo)
                        
    def OnDataReload(self, event):
        """Reload list of records"""
        self.OnApplySqlStatement(None)
        self.listOfSQLStatements = []

    def OnDataSelectAll(self, event):
        """Select all items"""
        list = self.FindWindowById(self.layerPage[self.layer]['data'])
        item = -1

        while True:
            item = list.GetNextItem(item)
            if item == -1:
                break
            list.SetItemState(item, wx.LIST_STATE_SELECTED, wx.LIST_STATE_SELECTED)

        event.Skip()

    def OnDataSelectNone(self, event):
        """Deselect items"""
        list = self.FindWindowById(self.layerPage[self.layer]['data'])
        item = -1

        while True:
            item = list.GetNextItem(item, wx.LIST_STATE_SELECTED)
            if item == -1:
                break
            list.SetItemState(item, 0, wx.LIST_STATE_SELECTED | wx.LIST_STATE_FOCUSED)

        event.Skip()


    def OnTableChangeType(self, event):
        """Data type for new column changed. Enable or disable
        data length widget"""
        win = self.FindWindowById(self.layerPage[self.layer]['addColLength'])
        if event.GetString() == "varchar":
            win.Enable(True)
        else:
            win.Enable(False)

    def OnTableRenameColumnName(self, event):
        """Editing column name to be added to the table"""
        btn  = self.FindWindowById(self.layerPage[self.layer]['renameColButton'])
        col  = self.FindWindowById(self.layerPage[self.layer]['renameCol'])
        colTo = self.FindWindowById(self.layerPage[self.layer]['renameColTo'])
        if len(col.GetValue()) > 0 and len(colTo.GetValue()) > 0:
            btn.Enable(True)
        else:
            btn.Enable(False)

        event.Skip()

    def OnTableAddColumnName(self, event):
        """Editing column name to be added to the table"""
        btn = self.FindWindowById(self.layerPage[self.layer]['addColButton'])
        if len(event.GetString()) > 0:
            btn.Enable(True)
        else:
            btn.Enable(False)

        event.Skip()

    def OnTableItemChange(self, event):
        """Rename column in the table"""
        list   = self.FindWindowById(self.layerPage[self.layer]['tableData'])
        name   = self.FindWindowById(self.layerPage[self.layer]['renameCol']).GetValue()
        nameTo = self.FindWindowById(self.layerPage[self.layer]['renameColTo']).GetValue()

        table = self.mapDBInfo.layers[self.layer]["table"]

        if not name or not nameTo:
            wx.MessageBox(self=self,
                          message=_("Unable to rename column. "
                                    "No column name defined."),
                          caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
            return
        else:
            item = list.FindItem(start=-1, str=name)
            if item > -1:
                if list.FindItem(start=-1, str=nameTo) > -1:
                    wx.MessageBox(parent=self,
                                  message=_("Unable to rename column <%(column)s> to "
                                            "<%(columnTo)s>. Column already exists "
                                            "in the table <%(table)s>.") % \
                                      {'column' : name, 'columnTo' : nameTo,
                                       'table' : table},
                                  caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
                    return
                else:
                    list.SetItemText(item, nameTo)

                    self.listOfCommands.append(('v.db.renamecol',
                                                { 'map'    : self.vectorName,
                                                  'layer'  : self.layer,
                                                  'column' : '%s,%s' % (name, nameTo) }
                                                ))
            else:
                wx.MessageBox(parent=self,
                              message=_("Unable to rename column. "
                                        "Column <%(column)s> doesn't exist in the table <%(table)s>.") % 
                              {'column' : name, 'table' : table},
                              caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
                return
            
        # apply changes
        self.ApplyCommands()

        # update widgets
        self.FindWindowById(self.layerPage[self.layer]['renameCol']).SetItems(self.mapDBInfo.GetColumns(table))
        self.FindWindowById(self.layerPage[self.layer]['renameCol']).SetSelection(0)
        self.FindWindowById(self.layerPage[self.layer]['renameColTo']).SetValue('')

        event.Skip()

    def OnTableRightUp(self, event):
        """Table description area, context menu"""
        if not hasattr(self, "popupTableID"):
            self.popupTableID1 = wx.NewId()
            self.popupTableID2 = wx.NewId()
            self.popupTableID3 = wx.NewId()
            self.Bind(wx.EVT_MENU, self.OnTableItemDelete,    id=self.popupTableID1)
            self.Bind(wx.EVT_MENU, self.OnTableItemDeleteAll, id=self.popupTableID2)
            self.Bind(wx.EVT_MENU, self.OnTableReload,        id=self.popupTableID3)

        # generate popup-menu
        menu = wx.Menu()
        menu.Append(self.popupTableID1, _("Drop selected column"))
        if self.FindWindowById(self.layerPage[self.layer]['tableData']).GetFirstSelected() == -1:
            menu.Enable(self.popupTableID1, False)
        menu.Append(self.popupTableID2, _("Drop all columns"))
        menu.AppendSeparator()
        menu.Append(self.popupTableID3, _("Reload"))

        self.PopupMenu(menu)
        menu.Destroy()

    def OnTableItemDelete(self, event):
        """Delete selected item(s) from the list"""
        list = self.FindWindowById(self.layerPage[self.layer]['tableData'])

        item = list.GetFirstSelected()
        while item != -1:
            self.listOfCommands.append(('v.db.dropcol',
                                        { 'map' : self.vectorName,
                                          'layer' : self.layer,
                                          'column' : list.GetItemText(item) }
                                        ))
            list.DeleteItem(item)
            item = list.GetFirstSelected()

        # apply changes
        self.ApplyCommands()

        # update widgets
        table = self.mapDBInfo.layers[self.layer]['table']
        self.FindWindowById(self.layerPage[self.layer]['renameCol']).SetItems(self.mapDBInfo.GetColumns(table))
        self.FindWindowById(self.layerPage[self.layer]['renameCol']).SetSelection(0)

        event.Skip()

    def OnTableItemDeleteAll(self, event):
        """Delete all items from the list"""
        table = self.mapDBInfo.layers[self.layer]['table']
        cols = self.mapDBInfo.GetColumns(table)
        for col in cols:
            self.listOfCommands.append(('v.db.dropcol',
                                        { 'map' : self.vectorName,
                                          'layer' : self.layer,
                                          'column' : col }
                                        ))
        self.FindWindowById(self.layerPage[self.layer]['tableData']).DeleteAllItems()

        # apply changes
        self.ApplyCommands()

        # update widgets
        table = self.mapDBInfo.layers[self.layer]['table']
        self.FindWindowById(self.layerPage[self.layer]['renameCol']).SetItems(self.mapDBInfo.GetColumns(table))
        self.FindWindowById(self.layerPage[self.layer]['renameCol']).SetSelection(0)

        event.Skip()

    def OnTableReload(self, event=None):
        """Reload table description"""
        self.FindWindowById(self.layerPage[self.layer]['tableData']).Populate(update=True)
        self.listOfCommands = []

    def OnTableItemAdd(self, event):
        """Add new column to the table"""
	table = self.mapDBInfo.layers[self.layer]['table']
        name = self.FindWindowById(self.layerPage[self.layer]['addColName']).GetValue()

        if not name:
            wx.MessageBox(parent=self,
                          message=_("Unable to add column to the table. "
                                    "No column name defined."),
                          caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
            return

        type = self.FindWindowById(self.layerPage[self.layer]['addColType']). \
            GetStringSelection()
        
        # cast type if needed
        if type == 'double':
            type = 'double precision'
        if type == 'varchar':
            length = int(self.FindWindowById(self.layerPage[self.layer]['addColLength']). \
                             GetValue())
        else:
            length = '' # FIXME

        # add item to the list of table columns
        list = self.FindWindowById(self.layerPage[self.layer]['tableData'])
        # check for duplicate items
        if list.FindItem(start=-1, str=name) > -1:
            wx.MessageBox(parent=self,
                          message=_("Column <%(column)s> already exists in table <%(table)s>.") % \
                              {'column' : name, 'table' : self.mapDBInfo.layers[self.layer]["table"]},
                          caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
            return
        index = list.InsertStringItem(sys.maxint, str(name))
        list.SetStringItem(index, 0, str(name))
        list.SetStringItem(index, 1, str(type))
        list.SetStringItem(index, 2, str(length))
        
        # add v.db.addcol command to the list
        if type == 'varchar':
            type += ' (%d)' % length
        self.listOfCommands.append(('v.db.addcol',
                                    { 'map' : self.vectorName,
                                      'layer' : self.layer,
                                      'columns' : '%s %s' % (name, type) }
                                    ))
        # apply changes
        self.ApplyCommands()
        
        # update widgets
        self.FindWindowById(self.layerPage[self.layer]['addColName']).SetValue('')
	self.FindWindowById(self.layerPage[self.layer]['renameCol']).SetItems(self.mapDBInfo.GetColumns(table))
        self.FindWindowById(self.layerPage[self.layer]['renameCol']).SetSelection(0)
        
        event.Skip()
        
    def OnLayerPageChanged(self, event):
        """Layer tab changed"""
        pageNum = event.GetSelection()
        self.layer = self.mapDBInfo.layers.keys()[pageNum]
        
        try:
            idCol = self.layerPage[self.layer]['whereColumn']
        except KeyError:
            idCol = None
        
        try:
            self.OnChangeSql(None)
            # update statusbar
            self.log.write(_("Number of loaded records: %d") % \
                               self.FindWindowById(self.layerPage[self.layer]['data']).\
                               GetItemCount())
        except:
            pass
        
        if idCol:
            winCol = self.FindWindowById(idCol)
            table = self.mapDBInfo.layers[self.layer]["table"]
            self.mapDBInfo.GetColumns(table)
        
        event.Skip()
        
    def OnPageChanged(self, event):
        try:
            id = self.layerPage[self.layer]['data']
        except KeyError:
            id = None
        
        if event.GetSelection() == 0 and id:
            win = self.FindWindowById(id)
            if win:
                self.log.write(_("Number of loaded records: %d") % win.GetItemCount())
            else:
                self.log.write("")
        else:
            self.log.write("")
        
        event.Skip()
        
    def OnLayerRightUp(self, event):
        """Layer description area, context menu"""
        pass

    def OnChangeSql(self, event):
        """Switch simple/advanced sql statement"""
        if self.FindWindowById(self.layerPage[self.layer]['simple']).GetValue():
            self.FindWindowById(self.layerPage[self.layer]['where']).Enable(True)
            self.FindWindowById(self.layerPage[self.layer]['statement']).Enable(False)
            self.FindWindowById(self.layerPage[self.layer]['builder']).Enable(False)
        else:
            self.FindWindowById(self.layerPage[self.layer]['where']).Enable(False)
            self.FindWindowById(self.layerPage[self.layer]['statement']).Enable(True)
            self.FindWindowById(self.layerPage[self.layer]['builder']).Enable(True)

    def ApplyCommands(self):
        """Apply changes"""
        # perform GRASS commands (e.g. v.db.addcol)
        if len(self.listOfCommands) > 0:
            for cmd in self.listOfCommands:
                gcmd.RunCommand(prog = cmd[0],
                                quiet = True,
                                parent = self,
                                **cmd[1])
            
            self.mapDBInfo = VectorDBInfo(self.vectorName)
            table = self.mapDBInfo.layers[self.layer]['table']

            # update table description
            list = self.FindWindowById(self.layerPage[self.layer]['tableData'])
            list.Update(table=self.mapDBInfo.tables[table],
                        columns=self.mapDBInfo.GetColumns(table))
            self.OnTableReload(None)

            # update data list
            list = self.FindWindowById(self.layerPage[self.layer]['data'])
            list.Update(self.mapDBInfo)

            # reset list of commands
            self.listOfCommands = []

        # perform SQL non-select statements (e.g. 'delete from table where cat=1')
        if len(self.listOfSQLStatements) > 0:
            sqlFile = tempfile.NamedTemporaryFile(mode="wt")
            for sql in self.listOfSQLStatements:
                enc = UserSettings.Get(group='atm', key='encoding', subkey='value')
                if not enc and \
                        os.environ.has_key('GRASS_DB_ENCODING'):
                    enc = os.environ['GRASS_DB_ENCODING']
                if enc:
                    sqlFile.file.write(sql.encode(enc) + ';')
                else:
                    sqlFile.file.write(sql + ';')
                sqlFile.file.write(os.linesep)
                sqlFile.file.flush()

            driver   = self.mapDBInfo.layers[self.layer]["driver"]
            database = self.mapDBInfo.layers[self.layer]["database"]

            Debug.msg(3, 'AttributeManger.ApplyCommands(): %s' %
                      ';'.join(["%s" % s for s in self.listOfSQLStatements]))

            gcmd.RunCommand('db.execute',
                            parent = self,
                            input = sqlFile.name,
                            driver = driver,
                            database = database)
            
            # reset list of statements
            self.listOfSQLStatements = []

    def OnApplySqlStatement(self, event):
        """Apply simple/advanced sql statement"""
        keyColumn = -1 # index of key column
        listWin = self.FindWindowById(self.layerPage[self.layer]['data'])
        if self.FindWindowById(self.layerPage[self.layer]['simple']).GetValue():
            # simple sql statement
            whereCol = self.FindWindowById(self.layerPage[self.layer]['whereColumn']).GetStringSelection()
            whereVal = self.FindWindowById(self.layerPage[self.layer]['where']).GetValue().strip()
            try:
                if len(whereVal) > 0:
                    keyColumn = listWin.LoadData(self.layer, where=whereCol + whereVal)
                else:
                    keyColumn = listWin.LoadData(self.layer)
            except gcmd.CmdError, e:
                wx.MessageBox(parent=self,
                              message=_("Loading attribute data failed.\n\n%s") % e.message,
                              caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
                self.FindWindowById(self.layerPage[self.layer]['where']).SetValue('')
        else:
            # advanced sql statement
            win = self.FindWindowById(self.layerPage[self.layer]['statement'])
            try:
                cols, where = self.ValidateSelectStatement(win.GetValue())
            except TypeError:
                wx.MessageBox(parent=self,
                              message=_("Loading attribute data failed.\n"
                                        "Invalid SQL select statement.\n\n%s") % win.GetValue(),
                              caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
                win.SetValue("SELECT * FROM %s" % self.mapDBInfo.layers[self.layer]['table'])
                cols = None
                where = None
            
            if cols or where:
                try:
                    keyColumn = listWin.LoadData(self.layer, columns=cols,
                                                 where=where)
                except gcmd.CmdError, e:
                    wx.MessageBox(parent=self,
                                  message=_("Loading attribute data failed.\n\n%s") % e.message,
                                  caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
                    win.SetValue("SELECT * FROM %s" % self.mapDBInfo.layers[self.layer]['table'])
        
        # sort by key column
        if keyColumn > -1:
            listWin.SortListItems(col=keyColumn, ascending=True)
        else:
            listWin.SortListItems(col=0, ascending=True) 

        # update statusbar
        self.log.write(_("Number of loaded records: %d") % \
                           self.FindWindowById(self.layerPage[self.layer]['data']).GetItemCount())

    def ValidateSelectStatement(self, statement):
        """Validate SQL select statement

        @return (columns, where)
        @return None on error
        """
        if statement[0:7].lower() != 'select ':
            return None
        
        cols = ''
        index = 7
        for c in statement[index:]:
            if c == ' ':
                break
            cols += c
            index += 1
        if cols == '*':
            cols = None
        else:
            cols = cols.split(',')
        
        tablelen = len(self.mapDBInfo.layers[self.layer]['table'])
        
        if statement[index+1:index+6].lower() != 'from ' or \
                statement[index+6:index+6+tablelen] != '%s' % \
                (self.mapDBInfo.layers[self.layer]['table']):
            return None
        
        if len(statement[index+7+tablelen:]) > 0:
            index = statement.lower().find('where ')
            if index > -1:
                where = statement[index+6:]
            else:
                return None
        else:
            where = None
        
        return (cols, where)
    
    def __createDbInfoDesc(self, panel, layer):
        """Create database connection information content"""
        infoFlexSizer = wx.FlexGridSizer (cols=2, hgap=1, vgap=1)
        infoFlexSizer.AddGrowableCol(1)
        
        infoFlexSizer.Add(item=wx.StaticText(parent=panel, id=wx.ID_ANY,
                                             label="Driver:"))
        infoFlexSizer.Add(item=wx.StaticText(parent=panel, id=wx.ID_ANY,
                                             label=self.mapDBInfo.layers[layer]['driver']))
        infoFlexSizer.Add(item=wx.StaticText(parent=panel, id=wx.ID_ANY,
                                             label="Database:"))
        infoFlexSizer.Add(item=wx.StaticText(parent=panel, id=wx.ID_ANY,
                                             label=self.mapDBInfo.layers[layer]['database']))
        infoFlexSizer.Add(item=wx.StaticText(parent=panel, id=wx.ID_ANY,
                                             label="Table:"))
        infoFlexSizer.Add(item=wx.StaticText(parent=panel, id=wx.ID_ANY,
                                             label=self.mapDBInfo.layers[layer]['table']))
        infoFlexSizer.Add(item=wx.StaticText(parent=panel, id=wx.ID_ANY,
                                             label="Key:"))
        infoFlexSizer.Add(item=wx.StaticText(parent=panel, id=wx.ID_ANY,
                                             label=self.mapDBInfo.layers[layer]['key']))

        return infoFlexSizer
        
    def OnCloseWindow(self, event):
        """Cancel button pressed"""
        self.Close()
        event.Skip()

    def OnBuilder(self,event):
        """SQL Builder button pressed"""
        self.builder = sqlbuilder.SQLFrame(parent=self, id=wx.ID_ANY,
                                           title=_("SQL Builder"),
                                           vectorName=self.vectorName)
    def OnTextEnter(self, event):
        pass

    def OnSQLBuilder(self, event):
        pass

    def OnDataItemActivated(self, event):
        """Item activated, highlight selected item"""
        self.OnDataDrawSelected(event)

        event.Skip()

    def OnExtractSelected(self, event):
        """
        Extract vector objects selected in attribute browse window
        to new vector map
        """
        list = self.FindWindowById(self.layerPage[self.layer]['data'])
        # cats = list.selectedCats[:]
        cats = list.GetSelectedItems()
        if len(cats) == 0:
            wx.MessageBox(parent=self,
                          message=_('Nothing to extract.'),
                          caption=_('Message'), style=wx.CENTRE)
            return
        else:
            # dialog to get file name
            gdialogs.CreateNewVector(parent = self, title = _('Extract selected features'),
                                     log = self.cmdLog,
                                     cmd = (('v.extract',
                                             { 'input' : self.vectorName,
                                               'list' : utils.ListOfCatsToRange(cats) },
                                             'output')))
    def OnDeleteSelected(self, event):
        """
        Delete vector objects selected in attribute browse window
        (attribures and geometry)
        """
        list = self.FindWindowById(self.layerPage[self.layer]['data'])
        cats = list.GetSelectedItems()
        if len(cats) == 0:
            wx.MessageBox(parent=self,
                          message=_('Nothing to delete.'),
                          caption=_('Message'), style=wx.CENTRE)
        
        if self.OnDataItemDelete(None):
            digitToolbar = self.mapdisplay.toolbars['vdigit']
            if digitToolbar and digitToolbar.GetLayer() and \
                    digitToolbar.GetLayer().GetName() == self.vectorName:
                self.mapdisplay.digit.driver.SetSelected(map(int, cats), field=self.layer)
                self.mapdisplay.digit.DeleteSelectedLines()
            else:
                gcmd.RunCommand('v.edit',
                                parent = self,
                                quiet = True,
                                map = self.vectorName,
                                tool = 'delete',
                                cats = utils.ListOfCatsToRange(cats))
                
            self.mapdisplay.MapWindow.UpdateMap(render=True, renderVector=True)
        
    def AddQueryMapLayer(self):
        """Redraw a map

        Return True if map has been redrawn, False if no map is given
        """
        list = self.FindWindowById(self.layerPage[self.layer]['data'])
        cats = { 
            self.layer : list.GetSelectedItems()
            }
        
        if self.mapdisplay.Map.GetLayerIndex(self.qlayer) < 0:
            self.qlayer = None
            
        if self.qlayer:
            self.qlayer.SetCmd(self.mapdisplay.AddTmpVectorMapLayer(self.vectorName, cats, addLayer=False))
        else:
            self.qlayer = self.mapdisplay.AddTmpVectorMapLayer(self.vectorName, cats)

        return self.qlayer
    
    def UpdateDialog(self, layer):
        """Updates dialog layout for given layer"""
        #
        # delete page
        #
        if layer in self.mapDBInfo.layers.keys():
            # delete page
            # draging pages disallowed
            # if self.browsePage.GetPageText(page).replace('Layer ', '').strip() == str(layer):
            # self.browsePage.DeletePage(page)
            # break
            self.browsePage.DeletePage(self.mapDBInfo.layers.keys().index(layer))
            self.manageTablePage.DeletePage(self.mapDBInfo.layers.keys().index(layer))
            # set current page selection
            self.notebook.SetSelection(2)
            
        # fetch fresh db info
        self.mapDBInfo = VectorDBInfo(self.vectorName)    

        #
        # add new page
        #
        if layer in self.mapDBInfo.layers.keys():
            # 'browse data' page
            self.__createBrowsePage(layer)
            # 'manage tables' page
            self.__createManageTablePage(layer)
            # set current page selection
            self.notebook.SetSelection(2)
            
        #
        # 'manage layers' page
        #
        # update list of layers
        self.layerList.Update(self.mapDBInfo.layers)
        self.layerList.Populate(update=True)
        # update selected widgets
        listOfLayers = map(str, self.mapDBInfo.layers.keys())
        ### delete layer page
        self.manageLayerBook.deleteLayer.SetItems(listOfLayers)
        if len(listOfLayers) > 0:
            self.manageLayerBook.deleteLayer.SetStringSelection(listOfLayers[0])
            tableName = self.mapDBInfo.layers[int(listOfLayers[0])]['table']
            maxLayer = max(self.mapDBInfo.layers.keys())
        else:
            tableName = ''
            maxLayer = 0
        self.manageLayerBook.deleteTable.SetLabel( \
            _('Drop also linked attribute table (%s)') % \
                tableName)
        ### add layer page
        self.manageLayerBook.addLayerWidgets['layer'][1].SetValue(\
            maxLayer+1)
        ### modify layer
        self.manageLayerBook.modifyLayerWidgets['layer'][1].SetItems(listOfLayers)
        self.manageLayerBook.OnChangeLayer(event=None)
        
class TableListCtrl(wx.ListCtrl,
                    listmix.ListCtrlAutoWidthMixin):
                    #                    listmix.TextEditMixin):
    """Table description list"""

    def __init__(self, parent, id, table, columns, pos=wx.DefaultPosition,
                 size=wx.DefaultSize):

        self.parent  = parent
        self.table   = table
        self.columns = columns
        wx.ListCtrl.__init__(self, parent, id, pos, size,
                             style=wx.LC_REPORT | wx.LC_HRULES | wx.LC_VRULES |
                             wx.BORDER_NONE)

        listmix.ListCtrlAutoWidthMixin.__init__(self)
        # listmix.TextEditMixin.__init__(self)

    def Update(self, table, columns):
        """Update column description"""
        self.table   = table
        self.columns = columns

    def Populate(self, update=False):
        """Populate the list"""
        itemData = {} # requested by sorter

        if not update:
            headings = [_("Column name"), _("Data type"), _("Data length")]
            i = 0
            for h in headings:
                self.InsertColumn(col=i, heading=h)
                self.SetColumnWidth(col=i, width=150)
                i += 1
        else:
            self.DeleteAllItems()

        i = 0
        for column in self.columns:
            index = self.InsertStringItem(sys.maxint, str(column))
            self.SetStringItem(index, 0, str(column))
            self.SetStringItem(index, 1, str(self.table[column]['type']))
            self.SetStringItem(index, 2, str(self.table[column]['length']))
            self.SetItemData(index, i)
            itemData[i] = (str(column),
                           str(self.table[column]['type']),
                           int(self.table[column]['length']))
            i = i + 1

        self.SendSizeEvent()
        
        return itemData

class LayerListCtrl(wx.ListCtrl,
                    listmix.ListCtrlAutoWidthMixin):
                    # listmix.ColumnSorterMixin):
                    # listmix.TextEditMixin):
    """Layer description list"""

    def __init__(self, parent, id, layers,
                 pos=wx.DefaultPosition,
                 size=wx.DefaultSize):

        self.parent = parent
        self.layers = layers
        wx.ListCtrl.__init__(self, parent, id, pos, size,
                             style=wx.LC_REPORT | wx.LC_HRULES | wx.LC_VRULES |
                             wx.BORDER_NONE)

        listmix.ListCtrlAutoWidthMixin.__init__(self)
        # listmix.TextEditMixin.__init__(self)

    def Update(self, layers):
        """Update description"""
        self.layers = layers

    def Populate(self, update=False):
        """Populate the list"""
        itemData = {} # requested by sorter

        if not update:
            headings = [_("Layer"),  _("Driver"), _("Database"), _("Table"), _("Key")]
            i = 0
            for h in headings:
                self.InsertColumn(col=i, heading=h)
                i += 1
        else:
            self.DeleteAllItems()

        i = 0
        for layer in self.layers.keys():
            index = self.InsertStringItem(sys.maxint, str(layer))
            self.SetStringItem(index, 0, str(layer))
            database = str(self.layers[layer]['database'])
            driver   = str(self.layers[layer]['driver'])
            table    = str(self.layers[layer]['table'])
            key      = str(self.layers[layer]['key'])
            self.SetStringItem(index, 1, driver)
            self.SetStringItem(index, 2, database)
            self.SetStringItem(index, 3, table)
            self.SetStringItem(index, 4, key)
            self.SetItemData(index, i)
            itemData[i] = (str(layer),
                           driver,
                           database,
                           table,
                           key)
            i += 1

        for i in range(self.GetColumnCount()):
            self.SetColumnWidth(col=i, width=wx.LIST_AUTOSIZE)
            if self.GetColumnWidth(col=i) < 60:
                self.SetColumnWidth(col=i, width=60)

        self.SendSizeEvent()
        
        return itemData

class LayerBook(wx.Notebook):
    """Manage layers (add, delete, modify)"""
    def __init__(self, parent, id,
                 parentDialog,
                 style=wx.BK_DEFAULT):
        wx.Notebook.__init__(self, parent, id, style=style)

        self.parent       = parent
        self.parentDialog = parentDialog
        self.mapDBInfo    = self.parentDialog.mapDBInfo

        #
        # drivers
        #
        drivers = gcmd.RunCommand('db.drivers',
                                  quiet = True,
                                  read = True,
                                  flags = 'p')
        
        self.listOfDrivers = []
        for drv in drivers.splitlines():
            self.listOfDrivers.append(drv.strip())
        
        #
        # get default values
        #
        self.defaultConnect = {}
        connect = gcmd.RunCommand('db.connect',
                                  flags = 'p',
                                  read = True,
                                  quiet = True)
        
        for line in connect.splitlines():
            item, value = line.split(':')
            self.defaultConnect[item.strip()] = value.strip()
        
        if len(self.defaultConnect['driver']) == 0 or \
               len(self.defaultConnect['database']) == 0:
            raise gcmd.DBMError(_('Unable to determine default DB connection settings. '
                                  'Please define DB connection using db.connect module.'))
        
        self.defaultTables = self.__getTables(self.defaultConnect['driver'],
                                              self.defaultConnect['database'])
        try:
            self.defaultColumns = self.__getColumns(self.defaultConnect['driver'],
                                                    self.defaultConnect['database'],
                                                    self.defaultTables[0])
        except IndexError:
            self.defaultColumns = []

        self.__createAddPage()
        self.__createDeletePage()
        self.__createModifyPage()

    def __createAddPage(self):
        """Add new layer"""
        self.addPanel = wx.Panel(parent=self, id=wx.ID_ANY)
        self.AddPage(page=self.addPanel, text=_("Add layer"))
        
        try:
            maxLayer = max(self.mapDBInfo.layers.keys())
        except ValueError:
            maxLayer = 0
        #
        # list of layer widgets (label, value)
        #
        self.addLayerWidgets = {'layer':
                                    (wx.StaticText(parent=self.addPanel, id=wx.ID_ANY,
                                                   label='%s:' % _("Layer")),
                                     wx.SpinCtrl(parent=self.addPanel, id=wx.ID_ANY, size=(65, -1),
                                                 initial=maxLayer+1,
                                                 min=1, max=1e6)),
                                'driver':
                                    (wx.StaticText(parent=self.addPanel, id=wx.ID_ANY,
                                                   label='%s:' % _("Driver")),
                                     wx.Choice(parent=self.addPanel, id=wx.ID_ANY, size=(200, -1),
                                               choices=self.listOfDrivers)),
                                'database':
                                    (wx.StaticText(parent=self.addPanel, id=wx.ID_ANY,
                                                   label='%s:' % _("Database")),
                                     wx.TextCtrl(parent=self.addPanel, id=wx.ID_ANY,
                                                 value='',
                                                 style=wx.TE_PROCESS_ENTER)),
                                'table':
                                    (wx.StaticText(parent=self.addPanel, id=wx.ID_ANY,
                                                   label='%s:' % _("Table")),
                                     wx.Choice(parent=self.addPanel, id=wx.ID_ANY, size=(200, -1),
                                               choices=self.defaultTables)),
                                'key':
                                    (wx.StaticText(parent=self.addPanel, id=wx.ID_ANY,
                                                   label='%s:' % _("Key column")),
                                     wx.Choice(parent=self.addPanel, id=wx.ID_ANY, size=(200, -1),
                                               choices=self.defaultColumns)),
                                'addCat':
                                    (wx.CheckBox(parent=self.addPanel, id=wx.ID_ANY,
                                                 label=_("Insert record for each category into table")),
                                     None),
                                }
        
        # set default values for widgets
        self.addLayerWidgets['driver'][1].SetStringSelection(self.defaultConnect['driver'])
        self.addLayerWidgets['database'][1].SetValue(self.defaultConnect['database'])
        self.addLayerWidgets['table'][1].SetSelection(0)
        self.addLayerWidgets['key'][1].SetSelection(0)
        # events
        self.addLayerWidgets['driver'][1].Bind(wx.EVT_CHOICE, self.OnDriverChanged)
        self.addLayerWidgets['database'][1].Bind(wx.EVT_TEXT_ENTER, self.OnDatabaseChanged)
        self.addLayerWidgets['table'][1].Bind(wx.EVT_CHOICE, self.OnTableChanged)
        
        # tooltips
        self.addLayerWidgets['addCat'][0].SetToolTipString(_("You need to add categories "
                                                             "by v.category module."))
        #
        # list of table widgets
        #
        keyCol = UserSettings.Get(group='atm', key='keycolumn', subkey='value')
        self.tableWidgets = {'table': (wx.StaticText(parent=self.addPanel, id=wx.ID_ANY,
                                                     label='%s:' % _("Table name")),
                                       wx.TextCtrl(parent=self.addPanel, id=wx.ID_ANY,
                                                   value='',
                                                   style=wx.TE_PROCESS_ENTER)),
                             'key': (wx.StaticText(parent=self.addPanel, id=wx.ID_ANY,
                                                   label='%s:' % _("Key column")),
                                     wx.TextCtrl(parent=self.addPanel, id=wx.ID_ANY,
                                                 value=keyCol,
                                                 style=wx.TE_PROCESS_ENTER))}
        # events
        self.tableWidgets['table'][1].Bind(wx.EVT_TEXT_ENTER, self.OnCreateTable)
        self.tableWidgets['key'][1].Bind(wx.EVT_TEXT_ENTER, self.OnCreateTable)
        
        btnTable   = wx.Button(self.addPanel, wx.ID_ANY, _("&Create table"),
                             size=(125,-1))
        btnTable.Bind(wx.EVT_BUTTON, self.OnCreateTable)
        
        btnLayer   = wx.Button(self.addPanel, wx.ID_ANY, _("&Add layer"),
                             size=(125,-1))
        btnLayer.Bind(wx.EVT_BUTTON, self.OnAddLayer)
        
        btnDefault = wx.Button(self.addPanel, wx.ID_ANY, _("&Set default"),
                               size=(125,-1))
        btnDefault.Bind(wx.EVT_BUTTON, self.OnSetDefault)
        
        # do layout
        
        pageSizer = wx.BoxSizer(wx.HORIZONTAL)
                
        # layer description
        
        layerBox = wx.StaticBox (parent=self.addPanel, id=wx.ID_ANY,
                                 label=" %s " % (_("Layer description")))
        layerSizer = wx.StaticBoxSizer(layerBox, wx.VERTICAL)
        
        # data area
        dataSizer = wx.GridBagSizer(hgap=5, vgap=5)
        dataSizer.AddGrowableCol(1)
        row = 0
        for key in ('layer', 'driver', 'database', 'table', 'key', 'addCat'):
            label, value = self.addLayerWidgets[key]
            if not value:
                span = (1, 2)
            else:
                span = (1, 1)
            dataSizer.Add(item=label,
                          flag=wx.ALIGN_CENTER_VERTICAL, pos=(row, 0),
                          span=span)
            
            if not value:
                row += 1
                continue

            if label.GetLabel() == "Layer:":
                style = wx.ALIGN_CENTER_VERTICAL | wx.ALIGN_LEFT
            else:
                style = wx.ALIGN_CENTER_VERTICAL | wx.EXPAND
            
            dataSizer.Add(item=value,
                          flag=style, pos=(row, 1))
            
            row += 1
        
        layerSizer.Add(item=dataSizer,
                       proportion=1,
                       flag=wx.ALL | wx.EXPAND,
                       border=5)
        
        btnSizer = wx.BoxSizer(wx.HORIZONTAL)
        btnSizer.Add(item=btnDefault,
                     proportion=0,
                     flag=wx.ALL | wx.ALIGN_LEFT,
                     border=5)
        
        btnSizer.Add(item=(5, 5),
                     proportion=1,
                     flag=wx.ALL | wx.EXPAND,
                     border=5)
        
        btnSizer.Add(item=btnLayer,
                     proportion=0,
                     flag=wx.ALL | wx.ALIGN_RIGHT,
                     border=5)
        
        layerSizer.Add(item=btnSizer,
                       proportion=0,
                       flag=wx.ALL | wx.EXPAND,
                       border=0)
                
        # table description
        tableBox = wx.StaticBox (parent=self.addPanel, id=wx.ID_ANY,
                                 label=" %s " % (_("Table description")))
        tableSizer = wx.StaticBoxSizer(tableBox, wx.VERTICAL)
        
        # data area
        dataSizer = wx.FlexGridSizer(cols=2, hgap=5, vgap=5)
        dataSizer.AddGrowableCol(1)
        for key in ['table', 'key']:
            label, value = self.tableWidgets[key]
            dataSizer.Add(item=label,
                          flag=wx.ALIGN_CENTER_VERTICAL)
            dataSizer.Add(item=value,
                          flag=wx.ALIGN_CENTER_VERTICAL | wx.EXPAND)

        tableSizer.Add(item=dataSizer,
                       proportion=1,
                       flag=wx.ALL | wx.EXPAND,
                       border=5)

        tableSizer.Add(item=btnTable,
                       proportion=0,
                       flag=wx.ALL | wx.ALIGN_BOTTOM | wx.ALIGN_RIGHT,
                       border=5)

        pageSizer.Add(item=layerSizer,
                      proportion=3,
                      flag=wx.ALL | wx.EXPAND,
                      border=3)
        
        pageSizer.Add(item=tableSizer,
                      proportion=2,
                      flag=wx.TOP | wx.BOTTOM | wx.RIGHT | wx.EXPAND,
                      border=3)
        
        self.addPanel.SetAutoLayout(True)
        self.addPanel.SetSizer(pageSizer)
        pageSizer.Fit(self.addPanel)
        
    def __createDeletePage(self):
        """Delete layer"""
        self.deletePanel = wx.Panel(parent=self, id=wx.ID_ANY)
        self.AddPage(page=self.deletePanel, text=_("Delete layer"))

        label = wx.StaticText(parent=self.deletePanel, id=wx.ID_ANY,
                              label='%s:' % _("Layer to detele"))

        self.deleteLayer = wx.ComboBox(parent=self.deletePanel, id=wx.ID_ANY, size=(100, -1),
                                       style=wx.CB_SIMPLE | wx.CB_READONLY,
                                       choices=map(str, self.mapDBInfo.layers.keys()))
        self.deleteLayer.SetSelection(0)           
        self.deleteLayer.Bind(wx.EVT_COMBOBOX, self.OnChangeLayer)

        try:
            tableName = self.mapDBInfo.layers[int(self.deleteLayer.GetStringSelection())]['table']
        except ValueError:
            tableName = ''
            
        self.deleteTable = wx.CheckBox(parent=self.deletePanel, id=wx.ID_ANY,
                                       label=_('Drop also linked attribute table (%s)') % \
                                       tableName)

        if tableName == '':
            self.deleteLayer.Enable(False)
            self.deleteTable.Enable(False)
            
        btnDelete   = wx.Button(self.deletePanel, wx.ID_DELETE, _("&Delete layer"),
                                size=(125,-1))
        btnDelete.Bind(wx.EVT_BUTTON, self.OnDeleteLayer)

        #
        # do layout
        #
        pageSizer = wx.BoxSizer(wx.VERTICAL)

        dataSizer = wx.BoxSizer(wx.VERTICAL)

        flexSizer = wx.FlexGridSizer(cols=2, hgap=5, vgap=5)
        flexSizer.AddGrowableCol(2)

        flexSizer.Add(item=label,
                      flag=wx.ALIGN_CENTER_VERTICAL)
        flexSizer.Add(item=self.deleteLayer,
                      flag=wx.ALIGN_CENTER_VERTICAL)

        dataSizer.Add(item=flexSizer,
                      proportion=0,
                      flag=wx.ALL | wx.EXPAND,
                      border=1)

        dataSizer.Add(item=self.deleteTable,
                      proportion=0,
                      flag=wx.ALL | wx.EXPAND,
                      border=1)

        pageSizer.Add(item=dataSizer,
                      proportion=1,
                      flag=wx.ALL | wx.EXPAND,
                      border=5)

        pageSizer.Add(item=btnDelete,
                      proportion=0,
                      flag=wx.ALL | wx.ALIGN_RIGHT,
                      border=5)

        self.deletePanel.SetSizer(pageSizer)

    def __createModifyPage(self):
        """Modify layer"""
        self.modifyPanel = wx.Panel(parent=self, id=wx.ID_ANY)
        self.AddPage(page=self.modifyPanel, text=_("Modify layer"))

        #
        # list of layer widgets (label, value)
        #
        self.modifyLayerWidgets = {'layer':
                                       (wx.StaticText(parent=self.modifyPanel, id=wx.ID_ANY,
                                                      label='%s:' % _("Layer")),
                                        wx.ComboBox(parent=self.modifyPanel, id=wx.ID_ANY,
                                                    size=(100, -1),
                                                    style=wx.CB_SIMPLE | wx.CB_READONLY,
                                                    choices=map(str, 
                                                                self.mapDBInfo.layers.keys()))),
                                   'driver':
                                       (wx.StaticText(parent=self.modifyPanel, id=wx.ID_ANY,
                                                      label='%s:' % _("Driver")),
                                        wx.Choice(parent=self.modifyPanel, id=wx.ID_ANY,
                                                  size=(200, -1),
                                                  choices=self.listOfDrivers)),
                                   'database':
                                       (wx.StaticText(parent=self.modifyPanel, id=wx.ID_ANY,
                                                      label='%s:' % _("Database")),
                                        wx.TextCtrl(parent=self.modifyPanel, id=wx.ID_ANY,
                                                    value='', size=(350, -1),
                                                    style=wx.TE_PROCESS_ENTER)),
                                   'table':
                                       (wx.StaticText(parent=self.modifyPanel, id=wx.ID_ANY,
                                                      label='%s:' % _("Table")),
                                        wx.Choice(parent=self.modifyPanel, id=wx.ID_ANY,
                                                  size=(200, -1),
                                                  choices=self.defaultTables)),
                                   'key':
                                       (wx.StaticText(parent=self.modifyPanel, id=wx.ID_ANY,
                                                      label='%s:' % _("Key column")),
                                        wx.Choice(parent=self.modifyPanel, id=wx.ID_ANY,
                                                  size=(200, -1),
                                                  choices=self.defaultColumns))}
        
        # set default values for widgets
        self.modifyLayerWidgets['layer'][1].SetSelection(0)
        try:
            layer = int(self.modifyLayerWidgets['layer'][1].GetStringSelection())
        except ValueError:
            layer = None
            for label in self.modifyLayerWidgets.keys():
                self.modifyLayerWidgets[label][1].Enable(False)

        if layer:
            driver   = self.mapDBInfo.layers[layer]['driver']
            database = self.mapDBInfo.layers[layer]['database']
            table    = self.mapDBInfo.layers[layer]['table']

            listOfColumns = self.__getColumns(driver, database, table)
            self.modifyLayerWidgets['driver'][1].SetStringSelection(driver)
            self.modifyLayerWidgets['database'][1].SetValue(database)
            if table in self.modifyLayerWidgets['table'][1].GetItems():
                self.modifyLayerWidgets['table'][1].SetStringSelection(table)
            else:
                if self.defaultConnect['schema'] != '':
                    table = self.defaultConnect['schema'] + table # try with default schema
                else:
                    table = 'public.' + table # try with 'public' schema
                self.modifyLayerWidgets['table'][1].SetStringSelection(table)
            self.modifyLayerWidgets['key'][1].SetItems(listOfColumns)
            self.modifyLayerWidgets['key'][1].SetSelection(0)

        # events
        self.modifyLayerWidgets['layer'][1].Bind(wx.EVT_COMBOBOX, self.OnChangeLayer)
        # self.modifyLayerWidgets['driver'][1].Bind(wx.EVT_CHOICE, self.OnDriverChanged)
        # self.modifyLayerWidgets['database'][1].Bind(wx.EVT_TEXT_ENTER, self.OnDatabaseChanged)
        # self.modifyLayerWidgets['table'][1].Bind(wx.EVT_CHOICE, self.OnTableChanged)

        btnModify = wx.Button(self.modifyPanel, wx.ID_DELETE, _("&Modify layer"),
                              size=(125,-1))
        btnModify.Bind(wx.EVT_BUTTON, self.OnModifyLayer)

        #
        # do layout
        #
        pageSizer = wx.BoxSizer(wx.VERTICAL)

        # data area
        dataSizer = wx.FlexGridSizer(cols=2, hgap=5, vgap=5)
        dataSizer.AddGrowableCol(1)
        for key in ('layer', 'driver', 'database', 'table', 'key'):
            label, value = self.modifyLayerWidgets[key]
            dataSizer.Add(item=label,
                          flag=wx.ALIGN_CENTER_VERTICAL)
            if label.GetLabel() == "Layer:":
                dataSizer.Add(item=value,
                              flag=wx.ALIGN_CENTER_VERTICAL | wx.ALIGN_LEFT)
            else:
                dataSizer.Add(item=value,
                              flag=wx.ALIGN_CENTER_VERTICAL)

        pageSizer.Add(item=dataSizer,
                      proportion=1,
                      flag=wx.ALL | wx.EXPAND,
                      border=5)

        pageSizer.Add(item=btnModify,
                      proportion=0,
                      flag=wx.ALL | wx.ALIGN_RIGHT,
                      border=5)

        self.modifyPanel.SetSizer(pageSizer)

    def __getTables(self, driver, database):
        """Get list of tables for given driver and database"""
        tables = []

        ret = gcmd.RunCommand('db.tables',
                              parent = self,
                              read = True,
                              flags = 'p',
                              driver = driver,
                              database = database)
        
        if ret is None:
            wx.MessageBox(parent=self,
                          message=_("Unable to get list of tables.\n"
                                    "Please use db.connect to set database parameters."),
                          caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
            
            return tables
        
        for table in ret.splitlines():
            tables.append(table)
        
        return tables

    def __getColumns(self, driver, database, table):
        """Get list of column of given table"""
        columns = []

        ret = gcmd.RunCommand('db.columns',
                              parent = self,
                              quiet = True,
                              read = True,
                              driver = driver,
                              database = database,
                              table = table)
        
        if ret == None:
            return columns
        
        for column in ret.splitlines():
            columns.append(column)
        
        return columns

    def OnDriverChanged(self, event):
        """Driver selection changed, update list of tables"""
        driver = event.GetString()
        database = self.addLayerWidgets['database'][1].GetValue()

        winTable = self.addLayerWidgets['table'][1]
        winKey   = self.addLayerWidgets['key'][1]
        tables   = self.__getTables(driver, database)

        winTable.SetItems(tables)
        winTable.SetSelection(0)

        if len(tables) == 0:
            winKey.SetItems([])

        event.Skip()

    def OnDatabaseChanged(self, event):
        """Database selection changed, update list of tables"""
        event.Skip()

    def OnTableChanged(self, event):
        """Table name changed, update list of columns"""
        driver   = self.addLayerWidgets['driver'][1].GetStringSelection()
        database = self.addLayerWidgets['database'][1].GetValue()
        table    = event.GetString()

        win  = self.addLayerWidgets['key'][1]
        cols = self.__getColumns(driver, database, table)
        win.SetItems(cols)
        win.SetSelection(0)

        event.Skip()

    def OnSetDefault(self, event):
        """Set default values"""
        driver   = self.addLayerWidgets['driver'][1]
        database = self.addLayerWidgets['database'][1]
        table    = self.addLayerWidgets['table'][1]
        key      = self.addLayerWidgets['key'][1]

        driver.SetStringSelection(self.defaultConnect['driver'])
        database.SetValue(self.defaultConnect['database'])
        tables = self.__getTables(self.defaultConnect['driver'],
                                  self.defaultConnect['database'])
        table.SetItems(tables)
        table.SetSelection(0)
        if len(tables) == 0:
            key.SetItems([])
        else:
            cols = self.__getColumns(self.defaultConnect['driver'],
                                     self.defaultConnect['database'],
                                     tables[0])
            key.SetItems(cols)
            key.SetSelection(0)

        event.Skip()

    def OnCreateTable(self, event):
        """Create new table (name and key column given)"""
        driver   = self.addLayerWidgets['driver'][1].GetStringSelection()
        database = self.addLayerWidgets['database'][1].GetValue()
        table    = self.tableWidgets['table'][1].GetValue()
        key      = self.tableWidgets['key'][1].GetValue()
        
        if not table or not key:
            wx.MessageBox(parent=self,
                          message=_("Unable to create new table. "
                                    "Table name or key column name is missing."),
                          caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
            return

        if table in self.addLayerWidgets['table'][1].GetItems():
            wx.MessageBox(parent=self,
                          message=_("Unable to create new table. "
                                    "Table <%s> already exists in the database.") % table,
                          caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
            return
        
        # create table
        sql = 'CREATE TABLE %s (%s INTEGER)' % (table, key)

        gcmd.RunCommand('db.execute',
                        quiet = True,
                        parent = self,
                        stdin = sql,
                        driver = driver,
                        database = database)
        
        # update list of tables
        tableList = self.addLayerWidgets['table'][1]
        tableList.SetItems(self.__getTables(driver, database))
        tableList.SetStringSelection(table)

        # update key column selection
        keyList = self.addLayerWidgets['key'][1]
        keyList.SetItems(self.__getColumns(driver, database, table))
        keyList.SetStringSelection(key)
        
        event.Skip()

    def OnAddLayer(self, event):
        """Add new layer to vector map"""
        layer    = int(self.addLayerWidgets['layer'][1].GetValue())
        layerWin = self.addLayerWidgets['layer'][1]
        driver   = self.addLayerWidgets['driver'][1].GetStringSelection()
        database = self.addLayerWidgets['database'][1].GetValue()
        table    = self.addLayerWidgets['table'][1].GetStringSelection()
        key      = self.addLayerWidgets['key'][1].GetStringSelection()
        
        if layer in self.mapDBInfo.layers.keys():
            wx.MessageBox(parent=self,
                          message=_("Unable to add new layer to vector map <%(vector)s>. "
                                    "Layer %(layer)d already exists.") % 
                          {'vector' : self.mapDBInfo.map, 'layer' : layer},
                          caption=_("Error"), style=wx.OK | wx.ICON_ERROR | wx.CENTRE)
            return

        # add new layer
        ret = gcmd.RunCommand('v.db.connect',
                              parent = self,
                              quiet = True,
                              map = self.mapDBInfo.map,
                              driver = driver,
                              database = database,
                              table = table,
                              key = key,
                              layer = layer)
        
        # insert records into table if required
        if self.addLayerWidgets['addCat'][0].IsChecked():
            gcmd.RunCommand('v.to.db',
                            parent = self,
                            quiet = True,
                            map = self.mapDBInfo.map,
                            layer = layer,
                            qlayer = layer,
                            option = 'cat',
                            columns = key)

        if ret == 0:
            # update dialog (only for new layer)
            self.parentDialog.UpdateDialog(layer=layer) 
            # update db info
            self.mapDBInfo = self.parentDialog.mapDBInfo
            # increase layer number
            layerWin.SetValue(layer+1)

        if len(self.mapDBInfo.layers.keys()) == 1:
            # first layer add --- enable previously disabled widgets
            self.deleteLayer.Enable()
            self.deleteTable.Enable()
            for label in self.modifyLayerWidgets.keys():
                self.modifyLayerWidgets[label][1].Enable()
            
    def OnDeleteLayer(self, event):
        """Delete layer"""
        try:
            layer = int(self.deleteLayer.GetValue())
        except:
            return

        gcmd.RunCommand('v.db.connect',
                        parent = self,
                        flags = 'd',
                        map = self.mapDBInfo.map,
                        layer = layer)

        # drop also table linked to layer which is deleted
        if self.deleteTable.IsChecked():
            driver   = self.addLayerWidgets['driver'][1].GetStringSelection()
            database = self.addLayerWidgets['database'][1].GetValue()
            table    = self.mapDBInfo.layers[layer]['table']
            sql      = 'DROP TABLE %s' % (table)

            gcmd.RunCommand('db.execute',
                            parent = self,
                            stdin = sql,
                            quiet = True,
                            driver = driver,
                            database = database)
            
            # update list of tables
            tableList = self.addLayerWidgets['table'][1]
            tableList.SetItems(self.__getTables(driver, database))
            tableList.SetStringSelection(table)
        
        # update dialog
        self.parentDialog.UpdateDialog(layer=layer) 
        # update db info
        self.mapDBInfo = self.parentDialog.mapDBInfo

        if len(self.mapDBInfo.layers.keys()) == 0:
            # disable selected widgets
            self.deleteLayer.Enable(False)
            self.deleteTable.Enable(False)
            for label in self.modifyLayerWidgets.keys():
                self.modifyLayerWidgets[label][1].Enable(False)
            
        event.Skip()

    def OnChangeLayer(self, event):
        """Layer number of layer to be deleted is changed"""
        try:
            layer = int(event.GetString())
        except:
            try:
                layer = self.mapDBInfo.layers.keys()[0]
            except:
                return

        if self.GetCurrentPage() == self.modifyPanel:
            driver   = self.mapDBInfo.layers[layer]['driver']
            database = self.mapDBInfo.layers[layer]['database']
            table    = self.mapDBInfo.layers[layer]['table']
            listOfColumns = self.__getColumns(driver, database, table)
            self.modifyLayerWidgets['driver'][1].SetStringSelection(driver)
            self.modifyLayerWidgets['database'][1].SetValue(database)
            self.modifyLayerWidgets['table'][1].SetStringSelection(table)
            self.modifyLayerWidgets['key'][1].SetItems(listOfColumns)
            self.modifyLayerWidgets['key'][1].SetSelection(0)
        else:
            self.deleteTable.SetLabel(_('Drop also linked attribute table (%s)') % \
                                          self.mapDBInfo.layers[layer]['table'])
        if event:
            event.Skip()

    def OnModifyLayer(self, event):
        """Modify layer connection settings"""

        layer = int(self.modifyLayerWidgets['layer'][1].GetStringSelection())

        modify = False
        if self.modifyLayerWidgets['driver'][1].GetStringSelection() != \
                self.mapDBInfo.layers[layer]['driver'] or \
                self.modifyLayerWidgets['database'][1].GetStringSelection() != \
                self.mapDBInfo.layers[layer]['database'] or \
                self.modifyLayerWidgets['table'][1].GetStringSelection() != \
                self.mapDBInfo.layers[layer]['table'] or \
                self.modifyLayerWidgets['key'][1].GetStringSelection() != \
                self.mapDBInfo.layers[layer]['key']:
            modify = True

        if modify:
            # delete layer
            gcmd.RunCommand('v.db.connect',
                            parent = self,
                            quiet = True,
                            flag = 'd',
                            map = self.mapDBInfo.map,
                            layer = layer)

            # add modified layer
            gcmd.RunCommand('v.db.connect',
                            quiet = True,
                            map = self.mapDBInfo.map,
                            driver = self.modifyLayerWidgets['driver'][1].GetStringSelection(),
                            database = self.modifyLayerWidgets['database'][1].GetValue(),
                            table = self.modifyLayerWidgets['table'][1].GetStringSelection(),
                            key = self.modifyLayerWidgets['key'][1].GetStringSelection(),
                            layer = int(layer))
            
            # update dialog (only for new layer)
            self.parentDialog.UpdateDialog(layer=layer) 
            # update db info
            self.mapDBInfo = self.parentDialog.mapDBInfo

        event.Skip()

class VectorDBInfo(gselect.VectorDBInfo):
    """Class providing information about attribute tables
    linked to the vector map"""
    def __init__(self, map):
        gselect.VectorDBInfo.__init__(self, map)
        
    def GetColumns(self, table):
        """Return list of columns names (based on their index)"""
        try:
            names = [''] * len(self.tables[table].keys())
        except KeyError:
            return []
        
        for name, desc in self.tables[table].iteritems():
            names[desc['index']] = name

        return names

    def SelectByPoint(self, queryCoords, qdist):
        """Get attributes by coordinates (all available layers)

        Return line id or None if no line is found"""
        line = None
        nselected = 0
        
        if os.environ.has_key("LC_ALL"):
            locale = os.environ["LC_ALL"]
            os.environ["LC_ALL"] = "C"
        
        ### FIXME (implement script-style output)        
        ret = gcmd.RunCommand('v.what',
                              quiet = True,
                              read = True,
                              flags = 'a',
                              map = self.map,
                              east_north = '%f,%f' % \
                                  (float(queryCoords[0]), float(queryCoords[1])),
                              distance = float(qdist))
        
        if os.environ.has_key("LC_ALL"):
            os.environ["LC_ALL"] = locale
        
        data = {}
        if ret:
            readAttrb = False
            for item in ret.splitlines():
                try:
                    key, value = item.split(':', 1)
                except ValueError:
                    continue
                
                if key == 'Layer' and readAttrb:
                    readAttrb = False
                
                if readAttrb:
                    name, value = item.split(':', 1)
                    name = name.strip()
                    value = value.strip()
                    # append value to the column
                    if len(value) < 1:
                        value = None
                    else:
                        if self.tables[table][name]['ctype'] != type(''):
                            value = self.tables[table][name]['ctype'] (value.strip())
                        else:
                            value = unicodeValue(value.strip())
                    self.tables[table][name]['values'].append(value)
                else:
                    if not data.has_key(key):
                        data[key] = []
                    data[key].append(value.strip())
                    
                    if key == 'Table':
                        table = value.strip()
                        
                    if key == 'Key column': # skip attributes
                        readAttrb = True

        return data
    
    def SelectFromTable(self, layer, cols='*', where=None):
        """Select records from the table

        Return number of selected records, -1 on error
        """
        if layer <= 0:
            return -1

        nselected = 0

        table = self.layers[layer]["table"] # get table desc
        # select values (only one record)
        if where is None or where is '':
            sql="SELECT %s FROM %s" % (cols, table)
        else:
            sql="SELECT %s FROM %s WHERE %s" % (cols, table, where)

        ret = gcmd.RunCommand('db.select',
                              parent = self,
                              read = True,
                              quiet = True,
                              flags = 'v',
                              sql= sql,
                              database = self.layers[layer]["database"],
                              driver = self.layers[layer]["driver"])
        
        # self.tables[table][key][1] = str(cat)
        if ret:
            for line in ret.splitlines():
                name, value = line.split('|')
                # casting ...
                if value:
                    if self.tables[table][name]['ctype'] != type(''):
                        value = self.tables[table][name]['ctype'] (value)
                    else:
                        value = unicodeValue(value)
                else:
                    value = None
                self.tables[table][name]['values'].append(value)
                nselected = 1

        return nselected

def main(argv=None):
    if argv is None:
        argv = sys.argv

    if len(argv) != 2:
        print >> sys.stderr, __doc__
        sys.exit()

    # Command line arguments of the script to be run are preserved by the
    # hotswap.py wrapper but hotswap.py and its options are removed that
    # sys.argv looks as if no wrapper was present.
    #print "argv:", `argv`

    #some applications might require image handlers
    wx.InitAllImageHandlers()

    app = wx.PySimpleApp()
    f = AttributeManager(parent=None, id=wx.ID_ANY,
                         title="%s - <%s>" % (_("GRASS GIS Attribute Table Manager"),
                                              argv[1]),
                         size=(900,600), vectorName=argv[1])
    f.Show()

    app.MainLoop()

if __name__ == '__main__':
    main()