Geografic-Information-System/gui/wxpython/gui_core/widgets.py

"""!
@package gui_core.widgets

@brief Core GUI widgets

Classes:
 - widgets::GNotebook
 - widgets::ScrolledPanel
 - widgets::NumTextCtrl
 - widgets::FloatSlider
 - widgets::SymbolButton
 - widgets::StaticWrapText
 - widgets::BaseValidator
 - widgets::IntegerValidator
 - widgets::FloatValidator
 - widgets::ItemTree

(C) 2008-2011 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 Martin Landa <landa.martin gmail.com> (Google SoC 2008/2010)
@author Enhancements by Michael Barton <michael.barton asu.edu>
@author Anna Kratochvilova <kratochanna gmail.com> (Google SoC 2011)
"""

import os
import sys
import string

import wx
import wx.lib.scrolledpanel as SP
try:
    import wx.lib.agw.flatnotebook   as FN
except ImportError:
    import wx.lib.flatnotebook   as FN
try:
    from wx.lib.buttons import ThemedGenBitmapTextButton as BitmapTextButton
except ImportError: # not sure about TGBTButton version
    from wx.lib.buttons import GenBitmapTextButton as BitmapTextButton
try:
    import wx.lib.agw.customtreectrl as CT
except ImportError:
    import wx.lib.customtreectrl as CT

from core        import globalvar
from core.debug  import Debug

from wx.lib.newevent import NewEvent
wxSymbolSelectionChanged, EVT_SYMBOL_SELECTION_CHANGED  = NewEvent()


class NotebookController:
    """!Provides handling of notebook page names.

    Translates page names to page indices.
    Class is aggregated in notebook subclasses.
    Notebook subclasses must delegate methods to controller.
    Methods inherited from notebook class must be delegated explicitly
    and other methods can be delegated by @c __getattr__.
    """
    def __init__(self, classObject, widget):
        self.notebookPages = {}
        self.classObject = classObject
        self.widget = widget

    def AddPage(self, **kwargs):
        """!Add a new page
        """
        if 'name' in kwargs:
            self.notebookPages[kwargs['name']] = kwargs['page']
            del kwargs['name']

        self.classObject.AddPage(self.widget, **kwargs)

    def InsertPage(self, **kwargs):
        """!Insert a new page
        """
        if 'name' in kwargs:
            self.notebookPages[kwargs['name']] = kwargs['page']
            del kwargs['name']
        self.classObject.InsertPage(self.widget, **kwargs)

    def DeletePage(self, page):
        """!Delete page

        @param page name
        @return True if page was deleted, False if not exists
        """
        delPageIndex = self.GetPageIndexByName(page)
        if delPageIndex != -1:
            ret = self.classObject.DeletePage(self.widget, delPageIndex)
            if ret:
                del self.notebookPages[page]
            return ret
        else:
            return False

    def RemovePage(self, page):
        """!Delete page without deleting the associated window.

        @param page name
        @return True if page was deleted, False if not exists
        """
        delPageIndex = self.GetPageIndexByName(page)
        if delPageIndex != -1:
            ret = self.classObject.RemovePage(self.widget, delPageIndex)
            if ret:
                del self.notebookPages[page]
            return ret
        else:
            return False

    def SetSelectionByName(self, page):
        """!Set notebook
        
        @param page names, eg. 'layers', 'output', 'search', 'pyshell', 'nviz'
        """
        idx = self.GetPageIndexByName(page)
        if self.classObject.GetSelection(self.widget) != idx:
            self.classObject.SetSelection(self.widget, idx)

    def GetPageIndexByName(self, page):
        """!Get notebook page index
        
        @param page name
        """
        if page not in self.notebookPages:
            return -1
        for pageIndex in range(self.classObject.GetPageCount(self.widget)):
            if self.notebookPages[page] == self.classObject.GetPage(self.widget, pageIndex):
                break
        return pageIndex

    def SetPageImage(self, page, index):
        """!Sets image index for page

        @param page page name
        @param index image index (in wx.ImageList)
        """
        pageIndex = self.GetPageIndexByName(page)
        self.classObject.SetPageImage(self.widget, pageIndex, index)


class FlatNotebookController(NotebookController):
    """!Controller specialized for FN.FlatNotebook subclasses"""
    def __init__(self, classObject, widget):
        NotebookController.__init__(self, classObject, widget)

    def GetPageIndexByName(self, page):
        """!Get notebook page index
        
        @param page name
        """
        if page not in self.notebookPages:
            return -1
        
        return self.classObject.GetPageIndex(self.widget, self.notebookPages[page])


class GNotebook(FN.FlatNotebook):
    """!Generic notebook widget.

    Enables advanced style settings.
    Problems with hidden tabs and does not respect system colors (native look).
    """
    def __init__(self, parent, style, **kwargs):
        if globalvar.hasAgw:
            FN.FlatNotebook.__init__(self, parent, id = wx.ID_ANY, agwStyle = style, **kwargs)
        else:
            FN.FlatNotebook.__init__(self, parent, id = wx.ID_ANY, style = style, **kwargs)
        
        self.controller = FlatNotebookController(classObject = FN.FlatNotebook, widget = self)

    def AddPage(self, **kwargs):
        """! @copydoc NotebookController::AddPage()"""
        self.controller.AddPage(**kwargs)

    def InsertPage(self, **kwargs):
        """! @copydoc NotebookController::InsertPage()"""
        self.controller.InsertPage(**kwargs)

    def DeletePage(self, page):
        """! @copydoc NotebookController::DeletePage()"""
        return self.controller.DeletePage(page)

    def RemovePage(self, page):
        """! @copydoc NotebookController::RemovePage()"""
        return self.controller.RemovePage(page)

    def SetPageImage(self, page, index):
        """! @copydoc NotebookController::SetPageImage()"""
        return self.controller.SetPageImage(page, index)

    def SetPageImage(self, page, index):
        """!Does nothing because we don't want images for this style"""
        pass

    def __getattr__(self, name):
        return getattr(self.controller, name)

class FormNotebook(wx.Notebook):
    """!Notebook widget.

    Respects native look.
    """
    def __init__(self, parent, style):
        wx.Notebook.__init__(self, parent, id = wx.ID_ANY, style = style)
        self.controller = NotebookController(classObject = wx.Notebook, widget = self)

    def AddPage(self, **kwargs):
        """!@copydoc NotebookController::AddPage()"""
        self.controller.AddPage(**kwargs)

    def InsertPage(self, **kwargs):
        """! @copydoc NotebookController::InsertPage()"""
        self.controller.InsertPage(**kwargs)

    def DeletePage(self, page):
        """ @copydoc NotebookController::DeletePage()"""
        return self.controller.DeletePage(page)

    def RemovePage(self, page):
        """ @copydoc NotebookController::RemovePage()"""
        return self.controller.RemovePage(page)

    def SetPageImage(self, page, index):
        """! @copydoc NotebookController::SetPageImage()"""
        return self.controller.SetPageImage(page, index)

    def __getattr__(self, name):
        return getattr(self.controller, name)


class FormListbook(wx.Listbook):
    """!Notebook widget.

    Respects native look.
    """
    def __init__(self, parent, style):
        wx.Listbook.__init__(self, parent, id = wx.ID_ANY, style = style)
        self.controller = NotebookController(classObject = wx.Listbook, widget = self)
            
    def AddPage(self, **kwargs):
        """!@copydoc NotebookController::AddPage()"""
        self.controller.AddPage(**kwargs)

    def InsertPage(self, **kwargs):
        """! @copydoc NotebookController::InsertPage()"""
        self.controller.InsertPage(**kwargs)

    def DeletePage(self, page):
        """ @copydoc NotebookController::DeletePage()"""
        return self.controller.DeletePage(page)

    def RemovePage(self, page):
        """ @copydoc NotebookController::RemovePage()"""
        return self.controller.RemovePage(page)

    def SetPageImage(self, page, index):
        """! @copydoc NotebookController::SetPageImage()"""
        return self.controller.SetPageImage(page, index)

    def __getattr__(self, name):
        return getattr(self.controller, name)


class ScrolledPanel(SP.ScrolledPanel):
    """!Custom ScrolledPanel to avoid strange behaviour concerning focus"""
    def __init__(self, parent, style = wx.TAB_TRAVERSAL):
        SP.ScrolledPanel.__init__(self, parent = parent, id = wx.ID_ANY, style = style)

    def OnChildFocus(self, event):
        pass
        
class NumTextCtrl(wx.TextCtrl):
    """!Class derived from wx.TextCtrl for numerical values only"""
    def __init__(self, parent,  **kwargs):
##        self.precision = kwargs.pop('prec')
        wx.TextCtrl.__init__(self, parent = parent,
            validator = NTCValidator(flag = 'DIGIT_ONLY'), **kwargs)
        
            
    def SetValue(self, value):
        super(NumTextCtrl, self).SetValue( str(value))
        
    def GetValue(self):
        val = super(NumTextCtrl, self).GetValue()
        if val == '':
            val = '0'
        try:
            return float(val)
        except ValueError:
            val = ''.join(''.join(val.split('-')).split('.'))
            return float(val)
        
    def SetRange(self, min, max):
        pass
   
class FloatSlider(wx.Slider):
    """!Class derived from wx.Slider for floats"""
    def __init__(self, **kwargs):
        Debug.msg(1, "FloatSlider.__init__()")
        wx.Slider.__init__(self, **kwargs)
        self.coef = 1.
        #init range
        self.minValueOrig = 0
        self.maxValueOrig = 1
        
    def SetValue(self, value):
        value *= self.coef 
        if abs(value) < 1 and value != 0:
            while abs(value) < 1:
                value *= 100
                self.coef *= 100
            super(FloatSlider, self).SetRange(self.minValueOrig * self.coef, self.maxValueOrig * self.coef)
        super(FloatSlider, self).SetValue(value)
        
        Debug.msg(4, "FloatSlider.SetValue(): value = %f" % value)
        
    def SetRange(self, minValue, maxValue):
        self.coef = 1.
        self.minValueOrig = minValue
        self.maxValueOrig = maxValue
        if abs(minValue) < 1 or abs(maxValue) < 1:
            while (abs(minValue) < 1 and minValue != 0) or (abs(maxValue) < 1 and maxValue != 0):
                minValue *= 100
                maxValue *= 100
                self.coef *= 100
            super(FloatSlider, self).SetValue(super(FloatSlider, self).GetValue() * self.coef)
        super(FloatSlider, self).SetRange(minValue, maxValue)
        Debug.msg(4, "FloatSlider.SetRange(): minValue = %f, maxValue = %f" % (minValue, maxValue))
            
    def GetValue(self):
        val = super(FloatSlider, self).GetValue()
        Debug.msg(4, "FloatSlider.GetValue(): value = %f" % (val/self.coef))
        return val/self.coef
        
        
class SymbolButton(BitmapTextButton):
    """!Button with symbol and label."""
    def __init__(self, parent, usage, label, **kwargs):
        """!Constructor
        
        @param parent parent (usually wx.Panel)
        @param usage determines usage and picture
        @param label displayed label
        """
        size = (15, 15)
        buffer = wx.EmptyBitmap(*size)
        BitmapTextButton.__init__(self, parent = parent, label = " " + label, bitmap = buffer, **kwargs)
        
        dc = wx.MemoryDC()
        dc.SelectObject(buffer)
        maskColor = wx.Color(255, 255, 255)
        dc.SetBrush(wx.Brush(maskColor))
        dc.Clear()
        
        if usage == 'record':
            self.DrawRecord(dc, size)
        elif usage == 'stop':
            self.DrawStop(dc, size)
        elif usage == 'play':
            self.DrawPlay(dc, size)
        elif usage == 'pause':
            self.DrawPause(dc, size)

        if sys.platform != "win32":
            buffer.SetMaskColour(maskColor)
        self.SetBitmapLabel(buffer)
        dc.SelectObject(wx.NullBitmap)
        
    def DrawRecord(self, dc, size):
        """!Draw record symbol"""
        dc.SetBrush(wx.Brush(wx.Color(255, 0, 0)))
        dc.DrawCircle(size[0]/2, size[1] / 2, size[0] / 2)
        
    def DrawStop(self, dc, size):
        """!Draw stop symbol"""
        dc.SetBrush(wx.Brush(wx.Color(50, 50, 50)))
        dc.DrawRectangle(0, 0, size[0], size[1])
        
    def DrawPlay(self, dc, size):
        """!Draw play symbol"""
        dc.SetBrush(wx.Brush(wx.Color(0, 255, 0)))
        points = (wx.Point(0, 0), wx.Point(0, size[1]), wx.Point(size[0], size[1] / 2))
        dc.DrawPolygon(points)
        
    def DrawPause(self, dc, size):
        """!Draw pause symbol"""
        dc.SetBrush(wx.Brush(wx.Color(50, 50, 50)))
        dc.DrawRectangle(0, 0, 2 * size[0] / 5, size[1])
        dc.DrawRectangle(3 * size[0] / 5, 0, 2 * size[0] / 5, size[1])

class StaticWrapText(wx.StaticText):
    """!A Static Text field that wraps its text to fit its width,
    enlarging its height if necessary.
    """
    def __init__(self, parent, id = wx.ID_ANY, label = '', *args, **kwds):
        self.parent        = parent
        self.originalLabel = label
        
        wx.StaticText.__init__(self, parent, id, label = '', *args, **kwds)
        
        self.SetLabel(label)
        self.Bind(wx.EVT_SIZE, self.OnResize)
    
    def SetLabel(self, label):
        self.originalLabel = label
        self.wrappedSize = None
        self.OnResize(None)

    def OnResize(self, event):
        if not getattr(self, "resizing", False):
            self.resizing = True
            newSize = wx.Size(self.parent.GetSize().width - 50,
                              self.GetSize().height)
            if self.wrappedSize != newSize:
                wx.StaticText.SetLabel(self, self.originalLabel)
                self.Wrap(newSize.width)
                self.wrappedSize = newSize
                
                self.SetSize(self.wrappedSize)
            del self.resizing

class BaseValidator(wx.PyValidator):
    def __init__(self):
        wx.PyValidator.__init__(self)
        
        self.Bind(wx.EVT_TEXT, self.OnText) 

    def OnText(self, event):
        """!Do validation"""
        self.Validate()
        
        event.Skip()
        
    def Validate(self):
        """Validate input"""
        textCtrl = self.GetWindow()
        text = textCtrl.GetValue()

        if text:
            try:
                self.type(text)
            except ValueError:
                textCtrl.SetBackgroundColour("grey")
                textCtrl.SetFocus()
                textCtrl.Refresh()
                return False
        
        sysColor = wx.SystemSettings_GetColour(wx.SYS_COLOUR_WINDOW)
        textCtrl.SetBackgroundColour(sysColor)
        
        textCtrl.Refresh()
        
        return True

    def TransferToWindow(self):
        return True # Prevent wxDialog from complaining.
    
    def TransferFromWindow(self):
        return True # Prevent wxDialog from complaining.

class IntegerValidator(BaseValidator):
    """!Validator for floating-point input"""
    def __init__(self):
        BaseValidator.__init__(self)
        self.type = int
        
    def Clone(self):
        """!Clone validator"""
        return IntegerValidator()

class FloatValidator(BaseValidator):
    """!Validator for floating-point input"""
    def __init__(self):
        BaseValidator.__init__(self)
        self.type = float
        
    def Clone(self):
        """!Clone validator"""
        return FloatValidator()

class NTCValidator(wx.PyValidator):
    """!validates input in textctrls, taken from wxpython demo"""
    def __init__(self, flag = None):
        wx.PyValidator.__init__(self)
        self.flag = flag
        self.Bind(wx.EVT_CHAR, self.OnChar)

    def Clone(self):
        return NTCValidator(self.flag)

    def OnChar(self, event):
        key = event.GetKeyCode()
        if key < wx.WXK_SPACE or key == wx.WXK_DELETE or key > 255:
            event.Skip()
            return
        if self.flag == 'DIGIT_ONLY' and chr(key) in string.digits + '.-':
            event.Skip()
            return
        if not wx.Validator_IsSilent():
            wx.Bell()
        # Returning without calling even.Skip eats the event before it
        # gets to the text control
        return  
    
class ItemTree(CT.CustomTreeCtrl):
    def __init__(self, parent, id = wx.ID_ANY,
                 ctstyle = CT.TR_HIDE_ROOT | CT.TR_FULL_ROW_HIGHLIGHT | CT.TR_HAS_BUTTONS |
                 CT.TR_LINES_AT_ROOT | CT.TR_SINGLE, **kwargs):
        if globalvar.hasAgw:
            super(ItemTree, self).__init__(parent, id, agwStyle = ctstyle, **kwargs)
        else:
            super(ItemTree, self).__init__(parent, id, style = ctstyle, **kwargs)
        
        self.root = self.AddRoot(_("Menu tree"))
        self.itemsMarked = [] # list of marked items
        self.itemSelected = None

    def SearchItems(self, element, value):
        """!Search item 

        @param element element index (see self.searchBy)
        @param value

        @return list of found tree items
        """
        items = list()
        if not value:
            return items
        
        item = self.GetFirstChild(self.root)[0]
        self._processItem(item, element, value, items)
        
        self.itemsMarked  = items
        self.itemSelected = None
        
        return items
    
    def _processItem(self, item, element, value, listOfItems):
        """!Search items (used by SearchItems)
        
        @param item reference item
        @param listOfItems list of found items
        """
        while item and item.IsOk():
            subItem = self.GetFirstChild(item)[0]
            if subItem:
                self._processItem(subItem, element, value, listOfItems)
            data = self.GetPyData(item)
            
            if data and element in data and \
                    value.lower() in data[element].lower():
                listOfItems.append(item)
            
            item = self.GetNextSibling(item)
            
    def GetSelected(self):
        """!Get selected item"""
        return self.itemSelected

    def OnShowItem(self, event):
        """!Highlight first found item in menu tree"""
        if len(self.itemsMarked) > 0:
            if self.GetSelected():
                self.ToggleItemSelection(self.GetSelected())
                idx = self.itemsMarked.index(self.GetSelected()) + 1
            else:
                idx = 0
            try:
                self.ToggleItemSelection(self.itemsMarked[idx])
                self.itemSelected = self.itemsMarked[idx]
                self.EnsureVisible(self.itemsMarked[idx])
            except IndexError:
                self.ToggleItemSelection(self.itemsMarked[0]) # reselect first item
                self.EnsureVisible(self.itemsMarked[0])
                self.itemSelected = self.itemsMarked[0]
        else:
            for item in self.root.GetChildren():
                self.Collapse(item)
            itemSelected = self.GetSelection()
            if itemSelected:
                self.ToggleItemSelection(itemSelected)
            self.itemSelected = None

class SingleSymbolPanel(wx.Panel):
    """!Panel for displaying one symbol.
    
    Changes background when selected. Assumes that parent will catch
    events emitted on mouse click. Used in gui_core::dialog::SymbolDialog.
    """
    def __init__(self, parent, symbolPath):
        """!Panel constructor
        
        @param parent parent (gui_core::dialog::SymbolDialog)
        @param symbolPath absolute path to symbol
        """
        wx.Panel.__init__(self, parent, id = wx.ID_ANY, style = wx.BORDER_RAISED)
        self.SetName(os.path.splitext(os.path.basename(symbolPath))[0])
        self.sBmp = wx.StaticBitmap(self, wx.ID_ANY, wx.Bitmap(symbolPath))

        self.selected = False
        self.selectColor = wx.SystemSettings.GetColour(wx.SYS_COLOUR_HIGHLIGHT)
        self.deselectColor = wx.SystemSettings.GetColour(wx.SYS_COLOUR_WINDOW)
        
        sizer = wx.BoxSizer()
        sizer.Add(item = self.sBmp, proportion = 0, flag = wx.ALL | wx.ALIGN_CENTER, border = 5)
        self.SetBackgroundColour(self.deselectColor)
        self.SetMinSize(self.GetBestSize())
        self.SetSizerAndFit(sizer)
        
        # binding to both (staticBitmap, Panel) necessary
        self.sBmp.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
        self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
        self.Bind(wx.EVT_LEFT_DCLICK, self.OnDoubleClick)
        self.sBmp.Bind(wx.EVT_LEFT_DCLICK, self.OnDoubleClick)
        
    def OnLeftDown(self, event):
        """!Panel selected, background changes"""
        self.selected = True
        self.SetBackgroundColour(self.selectColor)
        event.Skip()
        
        event = wxSymbolSelectionChanged(name = self.GetName(), doubleClick = False)
        wx.PostEvent(self.GetParent(), event)
        
    def OnDoubleClick(self, event):
        event = wxSymbolSelectionChanged(name = self.GetName(), doubleClick = True)
        wx.PostEvent(self.GetParent(), event)
        
    def Deselect(self):
        """!Panel deselected, background changes back to default"""
        self.selected = False
        self.SetBackgroundColour(self.deselectColor)
        
    def Select(self):
        """!Select panel, no event emitted"""
        self.selected = True
        self.SetBackgroundColour(self.selectColor)