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

"""
@package gselect

@brief Custom control that selects GRASS GIS elements

CLASSES:
 - Select
 - TreeCrtlComboPopup
 - VectorDBInfo
 - LayerSelect
 - ColumnSelect

(C) 2007-2008 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 Michael Barton, Martin Landa
"""

import os
import sys

import wx
import wx.combo

import grass
import globalvar
import gcmd
import utils
from preferences import globalSettings as UserSettings

class Select(wx.combo.ComboCtrl):
    def __init__(self, parent, id, size,
                 type, multiple=False, mapsets=None, exceptOf=[]):
        """
        Custom control to create a ComboBox with a tree control
        to display and select GIS elements within acessible mapsets.
        Elements can be selected with mouse. Can allow multiple selections, when
        argument multiple=True. Multiple selections are separated by commas.
        """
        wx.combo.ComboCtrl.__init__(self, parent=parent, id=id, size=size)

        self.tcp = TreeCtrlComboPopup()
        self.SetPopupControl(self.tcp)
        self.SetPopupExtents(0,100)
        self.tcp.GetElementList(type, mapsets, exceptOf)
        self.tcp.SetData(type, mapsets, exceptOf, multiple)

    def SetElementList(self, type):
        self.tcp.seltree.DeleteAllItems()
        self.tcp.GetElementList(type)

class TreeCtrlComboPopup(wx.combo.ComboPopup):
    """
    Create a tree ComboBox for selecting maps and other GIS elements
    in accessible mapsets within the current location
    """

    # overridden ComboPopup methods
    def Init(self):
        self.value = [] # for multiple is False -> len(self.value) in [0,1]
        self.curitem = None
        self.multiple = False
        self.type = None
        self.mapsets = []
        self.exceptOf = []

    def Create(self, parent):
        self.seltree = wx.TreeCtrl(parent, style=wx.TR_HIDE_ROOT
                                   |wx.TR_HAS_BUTTONS
                                   |wx.TR_SINGLE
                                   |wx.TR_LINES_AT_ROOT
                                   |wx.SIMPLE_BORDER
                                   |wx.TR_FULL_ROW_HIGHLIGHT)
        self.seltree.Bind(wx.EVT_MOTION, self.OnMotion)
        self.seltree.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
        self.seltree.Bind(wx.EVT_TREE_ITEM_EXPANDING, self.mapsetExpanded)
        self.seltree.Bind(wx.EVT_TREE_ITEM_COLLAPSED, self.mapsetCollapsed)
        self.seltree.Bind(wx.EVT_TREE_ITEM_ACTIVATED, self.mapsetActivated)
        self.seltree.Bind(wx.EVT_TREE_SEL_CHANGED, self.mapsetSelected)
        self.seltree.Bind(wx.EVT_TREE_DELETE_ITEM, lambda x: None)

    # the following dummy handler are needed to keep tree events from propagating up to
    # the parent GIS Manager layer tree
    def mapsetExpanded(self, event):
        pass

    def mapsetCollapsed(self, event):
        pass

    def mapsetActivated(self, event):
        pass

    def mapsetSelected(self, event):
        pass
    # end of dummy events

    def GetControl(self):
        return self.seltree

    def GetStringValue(self):
        str = ""
        for value in self.value:
            str += value + ","
        str = str.rstrip(',')
        return str

    def OnPopup(self):
        """Limited only for first selected"""
        # update list
        self.seltree.DeleteAllItems()
        self.GetElementList(self.type, self.mapsets, self.exceptOf)

        if len(self.value) > 0:
            root = self.seltree.GetRootItem()
            if not root:
                return
            item = self.FindItem(root, self.value[0])
            self.seltree.EnsureVisible(item)
            self.seltree.SelectItem(item)
            
    def SetStringValue(self, value):
        # this assumes that item strings are unique...
        root = self.seltree.GetRootItem()
        if not root:
            return
        found = self.FindItem(root, value)
        if found:
            self.value.append(found)
            self.seltree.SelectItem(found)

    def GetAdjustedSize(self, minWidth, prefHeight, maxHeight):
        return wx.Size(minWidth, min(200, maxHeight))

    def GetElementList(self, element, mapsets=None, exceptOf=[]):
        """
        Get list of GIS elements in accessible mapsets and display as tree
        with all relevant elements displayed beneath each mapset branch
        """
        # get current mapset
        curr_mapset = grass.gisenv()['MAPSET']
        
        # list of mapsets in current location
        if mapsets is None:
            mapsets = utils.ListOfMapsets()

        # map element types to g.mlist types
        elementdict = {'cell':'rast',
                       'raster':'rast',
                       'rast':'rast',
                       'raster files':'rast',
                       'grid3':'rast3d',
                       'rast3d':'rast3d',
                       'raster3D':'rast3d',
                       'raster3D files':'rast3d',
                       'vector':'vect',
                       'vect':'vect',
                       'binary vector files':'vect',
                       'dig':'oldvect',
                       'oldvect':'oldvect',
                       'old vector':'oldvect',
                       'dig_ascii':'asciivect',
                       'asciivect':'asciivect',
                       'asciivector':'asciivect',
                       'ascii vector files':'asciivect',
                       'icons':'icon',
                       'icon':'icon',
                       'paint icon files':'icon',
                       'paint/labels':'labels',
                       'labels':'labels',
                       'label':'labels',
                       'paint label files':'labels',
                       'site_lists':'sites',
                       'sites':'sites',
                       'site list':'sites',
                       'site list files':'sites',
                       'windows':'region',
                       'region':'region',
                       'region definition':'region',
                       'region definition files':'region',
                       'windows3d':'region3d',
                       'region3d':'region3d',
                       'region3D definition':'region3d',
                       'region3D definition files':'region3d',
                       'group':'group',
                       'imagery group':'group',
                       'imagery group files':'group',
                       '3d.view':'3dview',
                       '3dview':'3dview',
                       '3D viewing parameters':'3dview',
                       '3D view parameters':'3dview'}

        if element not in elementdict:
            self.AddItem(_('Not selectable element'))
            return

        # get directory tree nodes
        # reorder mapsets based on search path (TODO)
        for i in range(len(mapsets)):
            if i > 0 and mapsets[i] == curr_mapset:
                mapsets[i] = mapsets[0]
                mapsets[0] = curr_mapset

        filesdict = grass.list_grouped(elementdict[element])
        
        for dir in mapsets:
            dir_node = self.AddItem('Mapset: '+dir)
            self.seltree.SetItemTextColour(dir_node,wx.Colour(50,50,200))
            try:
                elem_list = filesdict[dir]
                elem_list.sort()
                for elem in elem_list:
                    if elem != '':
                        fullqElem = elem + '@' + dir
                        if len(exceptOf) > 0 and fullqElem in exceptOf:
                            continue
                        self.AddItem(fullqElem, parent=dir_node)
            except:
                continue

            if self.seltree.ItemHasChildren(dir_node):
                sel = UserSettings.Get(group='general', key='elementListExpand',
                                       subkey='selection')
                collapse = True

                if sel == 0: # collapse all expect PERMANENT and current
                    if dir in ('PERMANENT', curr_mapset):
                        collapse = False
                elif sel == 1: # collapse all expect PERMANENT
                    if dir == 'PERMANENT':
                        collapse = False
                elif sel == 2: # collapse all
                    pass
                elif sel == 3: # expand all
                    collapse = False
                
                if collapse:
                    self.seltree.Collapse(dir_node)
                else:
                    self.seltree.Expand(dir_node)
                
    # helpers
    def FindItem(self, parentItem, text):
        item, cookie = self.seltree.GetFirstChild(parentItem)
        while item:
            if self.seltree.GetItemText(item) == text:
                return item
            if self.seltree.ItemHasChildren(item):
                item = self.FindItem(item, text)
            item, cookie = self.seltree.GetNextChild(parentItem, cookie)
        return wx.TreeItemId()


    def AddItem(self, value, parent=None):
        if not parent:
            root = self.seltree.GetRootItem()
            if not root:
                root = self.seltree.AddRoot("<hidden root>")
            parent = root

        item = self.seltree.AppendItem(parent, text=value)
        return item

    def OnMotion(self, evt):
        # have the selection follow the mouse, like in a real combobox
        item, flags = self.seltree.HitTest(evt.GetPosition())
        if item and flags & wx.TREE_HITTEST_ONITEMLABEL:
            self.seltree.SelectItem(item)
            self.curitem = item
        evt.Skip()

    def OnLeftDown(self, evt):
        # do the combobox selection
        item, flags = self.seltree.HitTest(evt.GetPosition())
        if item and flags & wx.TREE_HITTEST_ONITEMLABEL:
            self.curitem = item

            if self.seltree.GetRootItem() == self.seltree.GetItemParent(item):
                self.value = [] # cannot select mapset item
            else:
                if self.multiple is True:
                    # text item should be unique
                    self.value.append(self.seltree.GetItemText(item))
                else:
                    self.value = [self.seltree.GetItemText(item), ]

            self.Dismiss()

        evt.Skip()

    def SetData(self, type, mapsets, exceptOf, multiple):
        """Select multiple items?"""
        self.type = type
        self.mapsets = mapsets
        self.exceptOf = exceptOf
        self.multiple = multiple
        
class VectorDBInfo:
    """Class providing information about attribute tables
    linked to a vector map"""
    def __init__(self, map):
        self.map = map
        # {layer number : {table, database, driver})
        self.layers = {}
        # {table : {column name : type, length, values, ids}}
        self.tables = {}

        if not self.__CheckDBConnection(): # -> self.layers
            return

        self.__DescribeTables() # -> self.tables

    def __CheckDBConnection(self):
        """Check DB connection"""
        layerCommand = gcmd.Command(cmd=["v.db.connect",
                                         "-g", "--q",
                                         "map=%s" % self.map],
                                    rerr=None, stderr=None)
        if layerCommand.returncode != 0:
            return False

        # list of available layers & (table, database, driver)
        for line in layerCommand.ReadStdOutput():
            lineList = line.split(' ')
            layer = lineList[0]
            if '/' in layer:
                layer, layer_name = lineList[0].split('/')
            else:
                layer_name = None
            # database can contain ' ' in it's path
            if len(lineList) > 5:
                database = ''.join(lineList[3:-1])
            else:
                database = lineList[3]
            self.layers[int(layer)] = {
                "name"     : layer_name,
                "table"    : lineList[1],
                "key"      : lineList[2],
                "database" : database,
                "driver"   : lineList[-1]
                }
            
        if (len(self.layers.keys()) == 0):
            return False

        return True

    def __DescribeTables(self):
        """Describe linked tables"""
        for layer in self.layers.keys():
            # determine column names and types
            table = self.layers[layer]["table"]
            columnsCommand = gcmd.Command (cmd=["db.describe",
                                                "-c", "--q",
                                                "table=%s" % self.layers[layer]["table"],
                                                "driver=%s" % self.layers[layer]["driver"],
                                                "database=%s" % self.layers[layer]["database"]])


            columns = {} # {name: {type, length, [values], [ids]}}

            if columnsCommand.returncode == 0:
                # skip nrows and ncols
                i = 0
                for line in columnsCommand.ReadStdOutput()[2:]:
                    num, name, type, length = line.strip().split(':')
                    # FIXME: support more datatypes
                    if type.lower() == "integer":
                        ctype = int
                    elif type.lower() == "double precision":
                        ctype = float
                    else:
                        ctype = str

                    columns[name.strip()] = { 'index'  : i,
                                              'type'   : type.lower(),
                                              'ctype'  : ctype,
                                              'length' : int(length),
                                              'values' : [],
                                              'ids'    : []}
                    i += 1
            else:
                return False

            # check for key column
            # v.db.connect -g/p returns always key column name lowercase
            if self.layers[layer]["key"] not in columns.keys():
                for col in columns.keys():
                    if col.lower() == self.layers[layer]["key"]:
                        self.layers[layer]["key"] = col.upper()
                        break
            
            self.tables[table] = columns
            #print 'self tables =', self.tables[table]

        return True
    
    def Reset(self):
        """Reset"""
        for layer in self.layers:
            table = self.layers[layer]["table"] # get table desc
            columns = self.tables[table]
            for name in self.tables[table].keys():
                self.tables[table][name]['values'] = []
                self.tables[table][name]['ids']    = []

class LayerSelect(wx.ComboBox):
    """
    Creates combo box for selecting data layers defined for vector.
    The 'layer' terminology is likely to change for GRASS 7
    """
    def __init__(self, parent,
                 id=wx.ID_ANY, value='1', pos=wx.DefaultPosition,
                 size=wx.DefaultSize, choices=['1'], **kargs):

        super(LayerSelect, self).__init__(parent, id, value, pos, size, choices)

        self.vector = kargs['vector'] # vector map to check for attribute tables

        if self.vector == '':
            return
        else:
            self.InsertLayers(self.vector)
        
    def InsertLayers(self, vector):
        """insert layers for a vector into the layer combobox"""
        layerchoices = VectorDBInfo(vector).layers.keys()
        self.Clear()
        for n in range(len(layerchoices)):
            self.Insert(str(layerchoices[n]), n)

        self.SetSelection(0)
        self.SetValue('1') # all vectors have a layer 1 by default

class ColumnSelect(wx.ComboBox):
    """
    Creates combo box for selecting columns in the attribute table for a vector.
    The 'layer' terminology is likely to change for GRASS 7
    """
    def __init__(self, parent,
                 id=wx.ID_ANY, value='', pos=wx.DefaultPosition,
                 size=wx.DefaultSize, choices=[''], **kargs):

        super(ColumnSelect, self).__init__(parent, id, value, pos, size, choices)

        self.vector = kargs['vector'] # vector map to check for attribute tables
        self.layer = kargs['layer'] # data layer connected to attribute table

        if self.vector == '' or self.layer == '':
            return
        else:
            self.InsertColumns(self.vector, self.layer)
                
    def InsertColumns(self, vector, layer):
        """Return list of columns names for a vector layer"""
        if vector == '' or layer == '': return
        
        table = VectorDBInfo(vector).layers[layer]["table"]
        columnchoices = VectorDBInfo(vector).tables[table].keys()
        columnchoices.sort()
        self.Clear()
        for n in range(len(columnchoices)):
            self.Insert(columnchoices[n], n)
            
        self.SetSelection(0)
        self.SetValue(columnchoices[0]) #set the combobox to the first column