Geografic-Information-System/gui/wxpython/mapswipe/frame.py

"""!
@package mapswipe.frame

@brief Map Swipe Frame

Classes:
 - dialogs::SwipeMapDialog

(C) 2012 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 Anna Kratochvilova <kratochanna gmail.com>
"""

import os
import sys
import wx
import time

import grass.script as grass

from gui_core.mapdisp   import DoubleMapFrame
from gui_core.dialogs   import GetImageHandlers
from mapwin.base import MapWindowProperties
from core.render        import Map
from mapdisp            import statusbar as sb
from core.debug         import Debug
from core.gcmd          import GError, GMessage
from core.utils import _
from core.layerlist import LayerListToRendererConverter

from mapswipe.toolbars  import SwipeMapToolbar, SwipeMainToolbar, SwipeMiscToolbar
from mapswipe.mapwindow import SwipeBufferedWindow
from mapswipe.dialogs   import SwipeMapDialog


class SwipeMapFrame(DoubleMapFrame):
    def __init__(self, parent  = None, giface = None, 
                 title = _("GRASS GIS Map Swipe"), name = "swipe", **kwargs):
        DoubleMapFrame.__init__(self, parent = parent, title = title, name = name,
                                firstMap = Map(), secondMap = Map(), **kwargs)
        Debug.msg (1, "SwipeMapFrame.__init__()")
        #
        # Add toolbars
        #
        toolbars = ['swipeMisc', 'swipeMap', 'swipeMain']
        if sys.platform == 'win32':
            self.AddToolbar(toolbars.pop(1))
            toolbars.reverse()
        else:
            self.AddToolbar(toolbars.pop(0))
        for toolb in toolbars:
            self.AddToolbar(toolb)
        self._giface = giface
        #
        # create widgets
        #
        self.splitter = MapSplitter(parent = self, id = wx.ID_ANY)

        self.sliderH = wx.Slider(self, id = wx.ID_ANY, style = wx.SL_HORIZONTAL)
        self.sliderV = wx.Slider(self, id = wx.ID_ANY, style = wx.SL_VERTICAL)
        
        self.mapWindowProperties = MapWindowProperties()
        self.mapWindowProperties.setValuesFromUserSettings()
        self.mapWindowProperties.autoRenderChanged.connect(self.OnAutoRenderChanged)
        self.firstMapWindow = SwipeBufferedWindow(parent = self.splitter, giface = self._giface,
                                                  properties=self.mapWindowProperties,
                                                  Map = self.firstMap)
        self.secondMapWindow = SwipeBufferedWindow(parent = self.splitter, giface = self._giface,
                                                   properties=self.mapWindowProperties,
                                                   Map = self.secondMap)
        self.MapWindow = self.firstMapWindow # current by default
        self.firstMapWindow.zoomhistory = self.secondMapWindow.zoomhistory
        self.SetBindRegions(True)

        self._mode = 'swipe'

        self._addPanes()
        self._bindWindowsActivation()
        self._setUpMapWindow(self.firstMapWindow)
        self._setUpMapWindow(self.secondMapWindow)

        self._mgr.GetPane('sliderV').Hide()
        self._mgr.GetPane('sliderH').Show()
        self.slider = self.sliderH

        self.InitStatusbar()

        self.Bind(wx.EVT_SIZE, self.OnSize)
        self.Bind(wx.EVT_IDLE, self.OnIdle)
        self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)

        self.SetSize((800, 600))
        
        self._mgr.Update()

        self.rasters = {'first': None, 'second': None}

        self._inputDialog = None

        # default action in map toolbar
        self.GetMapToolbar().SelectDefault()

        self.resize = False

        wx.CallAfter(self.CallAfterInit)

    def TrackCursor(self, event, showInFirst):
        """!Track cursor in one window and show cross in the other.

        Only for mirror mode.
        """
        if self._mode == 'swipe':
            event.Skip()
            return
        coords = event.GetPosition()
        if showInFirst:
            self.firstMapWindow.DrawMouseCross(coords = coords)
        else:
            self.secondMapWindow.DrawMouseCross(coords = coords)

        event.Skip()

    def ActivateFirstMap(self, event = None):
        """!Switch tracking direction"""
        super(SwipeMapFrame, self).ActivateFirstMap(event)

        self.firstMapWindow.Bind(wx.EVT_MOTION, lambda evt: self.TrackCursor(evt, showInFirst = False))
        self.secondMapWindow.Unbind(wx.EVT_MOTION)
        self.firstMapWindow.ClearLines()
        self.firstMapWindow.Refresh()

    def ActivateSecondMap(self, event = None):
        """!Switch tracking direction"""
        super(SwipeMapFrame, self).ActivateSecondMap(event)

        self.secondMapWindow.Bind(wx.EVT_MOTION,  lambda evt: self.TrackCursor(evt, showInFirst = True))
        self.firstMapWindow.Unbind(wx.EVT_MOTION)
        self.secondMapWindow.ClearLines()
        self.secondMapWindow.Refresh()

    def CallAfterInit(self):
        self.InitSliderBindings()
        self.splitter.SplitVertically(self.firstMapWindow, self.secondMapWindow, 0)
        self.splitter.Init()
        if not (self.rasters['first'] and self.rasters['second']):
            self.OnSelectLayers(event=None)
        
    def InitStatusbar(self):
        """!Init statusbar (default items)."""
        # items for choice
        self.statusbarItems = [sb.SbCoordinates,
                               sb.SbRegionExtent,
                               sb.SbCompRegionExtent,
                               sb.SbShowRegion,
                               sb.SbAlignExtent,
                               sb.SbResolution,
                               sb.SbDisplayGeometry,
                               sb.SbMapScale,
                               sb.SbGoTo,
                               sb.SbProjection]
        
        # create statusbar and its manager
        statusbar = self.CreateStatusBar(number = 4, style = 0)
        statusbar.SetStatusWidths([-5, -2, -1, -1])
        self.statusbarManager = sb.SbManager(mapframe = self, statusbar = statusbar)
        
        # fill statusbar manager
        self.statusbarManager.AddStatusbarItemsByClass(self.statusbarItems, mapframe = self, statusbar = statusbar)
        self.statusbarManager.AddStatusbarItem(sb.SbMask(self, statusbar = statusbar, position = 2))
        sbRender = sb.SbRender(self, statusbar = statusbar, position = 3)
        self.statusbarManager.AddStatusbarItem(sbRender)
        
        self.statusbarManager.Update()

    def ResetSlider(self):
        if self.splitter.GetSplitMode() == wx.SPLIT_VERTICAL:
            size = self.splitter.GetSize()[0]
        else:
            size = self.splitter.GetSize()[1]
        self.slider.SetRange(0, size)
        self.slider.SetValue(self.splitter.GetSashPosition())


    def InitSliderBindings(self):
        self.sliderH.Bind(wx.EVT_SPIN, self.OnSliderPositionChanging)
        self.sliderH.Bind(wx.EVT_SCROLL_THUMBRELEASE, self.OnSliderPositionChanged)
        self.sliderV.Bind(wx.EVT_SPIN, self.OnSliderPositionChanging)
        self.sliderV.Bind(wx.EVT_SCROLL_THUMBRELEASE, self.OnSliderPositionChanged)
        self.splitter.Bind(wx.EVT_SPLITTER_SASH_POS_CHANGING, self.OnSashChanging)
        self.splitter.Bind(wx.EVT_SPLITTER_SASH_POS_CHANGED, self.OnSashChanged)


    def OnSliderPositionChanging(self, event):
        """!Slider changes its position, sash must be moved too."""
        Debug.msg (5, "SwipeMapFrame.OnSliderPositionChanging()")

        self.GetFirstWindow().movingSash = True
        self.GetSecondWindow().movingSash = True
        pos = event.GetPosition()

        if pos > 0:
            self.splitter.SetSashPosition(pos)
            self.splitter.OnSashChanging(None)

    def OnSliderPositionChanged(self, event):
        """!Slider position changed, sash must be moved too."""
        Debug.msg (5, "SwipeMapFrame.OnSliderPositionChanged()")

        self.splitter.SetSashPosition(event.GetPosition())
        self.splitter.OnSashChanged(None)

    def OnSashChanging(self, event):
        """!Sash position is changing, slider must be moved too."""
        Debug.msg (5, "SwipeMapFrame.OnSashChanging()")

        self.slider.SetValue(self.splitter.GetSashPosition())
        event.Skip()

    def OnSashChanged(self, event):
        """!Sash position changed, slider must be moved too."""
        Debug.msg (5, "SwipeMapFrame.OnSashChanged()")

        self.OnSashChanging(event)
        event.Skip()

    def OnSize(self, event):
        Debug.msg (4, "SwipeMapFrame.OnSize()")
        self.resize = time.clock()
        super(SwipeMapFrame, self).OnSize(event)

    def OnIdle(self, event):
        if self.resize and time.clock() - self.resize > 0.2:
            w1 = self.GetFirstWindow()
            w2 = self.GetSecondWindow()

            sizeAll = self.splitter.GetSize()
            w1.SetClientSize(sizeAll)
            w2.SetClientSize(sizeAll)
            
            w1.OnSize(event)
            w2.OnSize(event)
            self.ResetSlider()
            self.resize = False

    def OnAutoRenderChanged(self, value):
        """!Auto rendering state changed."""
        style = self.splitter.GetWindowStyle()
        style ^= wx.SP_LIVE_UPDATE
        self.splitter.SetWindowStyle(style)

    def AddToolbar(self, name):
        """!Add defined toolbar to the window
        
        Currently known toolbars are:
         - 'swipeMap'          - basic map toolbar
         - 'swipeMain'         - swipe functionality
        """
        if name == "swipeMap":
            self.toolbars[name] = SwipeMapToolbar(self, self._toolSwitcher)
            self._mgr.AddPane(self.toolbars[name],
                      wx.aui.AuiPaneInfo().
                      Name(name).Caption(_("Map Toolbar")).
                      ToolbarPane().Top().
                      LeftDockable(False).RightDockable(False).
                      BottomDockable(False).TopDockable(True).
                      CloseButton(False).Layer(2).Row(1).
                      BestSize((self.toolbars[name].GetBestSize())))

        if name == "swipeMain":
            self.toolbars[name] = SwipeMainToolbar(self)

            self._mgr.AddPane(self.toolbars[name],
                      wx.aui.AuiPaneInfo().
                      Name(name).Caption(_("Main Toolbar")).
                      ToolbarPane().Top().
                      LeftDockable(False).RightDockable(False).
                      BottomDockable(False).TopDockable(True).
                      CloseButton(False).Layer(2).Row(1).
                      BestSize((self.toolbars[name].GetBestSize())))

        if name == "swipeMisc":
            self.toolbars[name] = SwipeMiscToolbar(self)

            self._mgr.AddPane(self.toolbars[name],
                      wx.aui.AuiPaneInfo().
                      Name(name).Caption(_("Misc Toolbar")).
                      ToolbarPane().Top().
                      LeftDockable(False).RightDockable(False).
                      BottomDockable(False).TopDockable(True).
                      CloseButton(False).Layer(2).Row(1).
                      BestSize((self.toolbars[name].GetBestSize())))

    def _addPanes(self):
        """!Add splitter window and sliders to aui manager"""
        # splitter window
        self._mgr.AddPane(self.splitter, wx.aui.AuiPaneInfo().
                  Name('splitter').CaptionVisible(False).PaneBorder(True).
                  Dockable(False).Floatable(False).CloseButton(False).
                  Center().Layer(1).BestSize((self.splitter.GetBestSize())))

        # sliders
        self._mgr.AddPane(self.sliderH, wx.aui.AuiPaneInfo().
                  Name('sliderH').CaptionVisible(False).PaneBorder(False).
                  CloseButton(False).Gripper(True).GripperTop(False).
                  BottomDockable(True).TopDockable(True).
                  LeftDockable(False).RightDockable(False).
                  Bottom().Layer(1).BestSize((self.sliderH.GetBestSize())))

        self._mgr.AddPane(self.sliderV, wx.aui.AuiPaneInfo().
                  Name('sliderV').CaptionVisible(False).PaneBorder(False).
                  CloseButton(False).Gripper(True).GripperTop(True).
                  BottomDockable(False).TopDockable(False).
                  LeftDockable(True).RightDockable(True).
                  Right().Layer(1).BestSize((self.sliderV.GetBestSize())))

    def ZoomToMap(self):
        """!
        Set display extents to match selected raster (including NULLs)
        or vector map.
        """
        layers = []
        if self.rasters['first']:
            layers += self.firstMap.GetListOfLayers()
        if self.rasters['second']:
            layers += self.secondMap.GetListOfLayers()
        
        self.GetFirstWindow().ZoomToMap(layers = layers)
        self.GetSecondWindow().ZoomToMap(layers = layers)

    def OnZoomToMap(self, event):
        """!Zoom to map"""
        self.ZoomToMap()

    def OnZoomBack(self, event):
        self.GetFirstWindow().ZoomBack()
        self.secondMap.region = self.firstMap.region
        self.Render(self.GetSecondWindow())

    def OnSelectLayers(self, event):
        if self._inputDialog is None:
            dlg = SwipeMapDialog(self, first=self.rasters['first'],
                                 second=self.rasters['second'],
                                 firstLayerList=None, secondLayerList=None)
            dlg.applyChanges.connect(self.OnApplyInputChanges)
            # connect to convertor object to convert to Map
            # store reference to convertor is needed otherwise it would be discarded
            self._firstConverter = self._connectSimpleLmgr(dlg.GetFirstSimpleLmgr(),
                                                           self.GetFirstMap())
            self._secondConverter = self._connectSimpleLmgr(dlg.GetSecondSimpleLmgr(),
                                                            self.GetSecondMap())
            self._inputDialog = dlg
            dlg.CentreOnParent()
            dlg.Show()
        else:
            if self._inputDialog.IsShown():
                self._inputDialog.Raise()
                self._inputDialog.SetFocus()
            else:
                self._inputDialog.Show()

    def _connectSimpleLmgr(self, lmgr, renderer):
        converter = LayerListToRendererConverter(renderer)
        lmgr.opacityChanged.connect(converter.ChangeLayerOpacity)
        lmgr.cmdChanged.connect(converter.ChangeLayerCmd)
        lmgr.layerAdded.connect(converter.AddLayer)
        lmgr.layerRemoved.connect(converter.RemoveLayer)
        lmgr.layerActivated.connect(converter.ChangeLayerActive)
        lmgr.layerMovedUp.connect(converter.MoveLayerUp)
        lmgr.layerMovedDown.connect(converter.MoveLayerDown)
        lmgr.anyChange.connect(self._simpleLmgrChanged)
        return converter

    def _simpleLmgrChanged(self):
        if self.IsAutoRendered():
            self.OnRender(event=None)

    def OnApplyInputChanges(self):
        first, second = self._inputDialog.GetValues()
        if self._inputDialog.IsSimpleMode():
            self.rasters['first'], self.rasters['second'] = first, second
            res1 = self.SetFirstRaster(name=self.rasters['first'])
            res2 = self.SetSecondRaster(name=self.rasters['second'])
            if not (res1 and res2) and first and second:
                message = ''
                if not res1:
                    message += _("Map <%s> not found. ") % self.rasters['first']
                if not res2:
                    message += _("Map <%s> not found.") % self.rasters['second']
                    GError(parent = self, message = message)
                    return
            self.ZoomToMap()
        else:
            LayerListToRendererConverter(self.GetFirstMap()).ConvertAll(first)
            LayerListToRendererConverter(self.GetSecondMap()).ConvertAll(second)

        self.SetRasterNames()
        if self.IsAutoRendered():
            self.OnRender(event=None)

    def SetFirstRaster(self, name):
        """!Set raster map to first Map"""
        raster = grass.find_file(name = name, element = 'cell')
        if raster['fullname']:
            self.rasters['first'] = raster['fullname']
            self.SetLayer(name = raster['fullname'], mapInstance = self.GetFirstMap())
            return True

        return False

    def SetSecondRaster(self, name):
        """!Set raster map to second Map"""
        raster = grass.find_file(name = name, element = 'cell')
        if raster['fullname']:
            self.rasters['second'] = raster['fullname']
            self.SetLayer(name = raster['fullname'], mapInstance = self.GetSecondMap())
            return True

        return False

    def SetLayer(self, name, mapInstance):
        """!Sets layer in Map.
        
        @param name layer (raster) name
        """
        Debug.msg (3, "SwipeMapFrame.SetLayer(): name=%s" % name)
        
        # this simple application enables to keep only one raster
        mapInstance.DeleteAllLayers()
        cmdlist = ['d.rast', 'map=%s' % name]
        # add layer to Map instance (core.render)
        newLayer = mapInstance.AddLayer(ltype = 'raster', command = cmdlist, active = True,
                                        name = name, hidden = False, opacity = 1.0,
                                        render = True)

    def OnSwitchWindows(self, event):
        """!Switch windows position."""
        Debug.msg(3, "SwipeMapFrame.OnSwitchWindows()")

        splitter = self.splitter
        w1, w2 = splitter.GetWindow1(), splitter.GetWindow2()
        splitter.ReplaceWindow(w1, w2)
        splitter.ReplaceWindow(w2, w1)
        # self.OnSize(None)
        splitter.OnSashChanged(None)

    def _saveToFile(self, fileName, fileType):
        """!Creates composite image by rendering both images and
        pasting them into the new one.

        @todo specify size of the new image (problem is inaccurate scaling)
        @todo make dividing line width and color optional
        """
        w1 = self.splitter.GetWindow1()
        w2 = self.splitter.GetWindow2()
        lineWidth = 1
        # render to temporary files
        filename1 = grass.tempfile(False) + '1'
        filename2 = grass.tempfile(False) + '2'
        width, height = self.splitter.GetClientSize()
        if self._mode == 'swipe':
            x, y = w2.GetImageCoords()
            w1.SaveToFile(filename1, fileType, width, height)
            w2.SaveToFile(filename2, fileType, width, height)
        else:
            fw, fh = w1.GetClientSize()
            w1.SaveToFile(filename1, fileType, fw, fh)
            sw, sh = w2.GetClientSize()
            w2.SaveToFile(filename2, fileType, sw, sh)

        # create empty white image  - needed for line
        im = wx.EmptyImage(width, height)
        im.Replace(0, 0, 0, 255, 255, 255)

        # paste images
        if self._mode == 'swipe':
            if self.splitter.GetSplitMode() == wx.SPLIT_HORIZONTAL:
                im1 = wx.Image(filename1).GetSubImage((0, 0, width, -y))
                im.Paste(im1, 0, 0)
                im.Paste(wx.Image(filename2), -x, -y + lineWidth)
            else:
                im1 = wx.Image(filename1).GetSubImage((0, 0, -x, height))
                im.Paste(im1, 0, 0)
                im.Paste(wx.Image(filename2), -x + lineWidth, -y)
        else:
            if self.splitter.GetSplitMode() == wx.SPLIT_HORIZONTAL:
                im1 = wx.Image(filename1)
                im.Paste(im1, 0, 0)
                im.Paste(wx.Image(filename2), 0, fh + lineWidth)
            else:
                im1 = wx.Image(filename1)
                im.Paste(im1, 0, 0)
                im.Paste(wx.Image(filename2), fw + lineWidth, 0)
        im.SaveFile(fileName, fileType)

        # remove temporary files
        grass.try_remove(filename1)
        grass.try_remove(filename2)

    def SaveToFile(self, event):
        """!Save map to image
        """
        img = self.firstMapWindow.img or self.secondMapWindow.img
        if not img:
            GMessage(parent = self,
                     message = _("Nothing to render (empty map). Operation canceled."))
            return
        filetype, ltype = GetImageHandlers(img)
        
        # get filename
        dlg = wx.FileDialog(parent = self,
                            message = _("Choose a file name to save the image "
                                        "(no need to add extension)"),
                            wildcard = filetype,
                            style = wx.SAVE | wx.FD_OVERWRITE_PROMPT)
        
        if dlg.ShowModal() == wx.ID_OK:
            path = dlg.GetPath()
            if not path:
                dlg.Destroy()
                return
            
            base, ext = os.path.splitext(path)
            fileType = ltype[dlg.GetFilterIndex()]['type']
            extType  = ltype[dlg.GetFilterIndex()]['ext']
            if ext != extType:
                path = base + '.' + extType
            
            self._saveToFile(path, fileType)
            
        dlg.Destroy()

    def OnSwitchOrientation(self, event):
        """!Switch orientation of the sash."""
        Debug.msg(3, "SwipeMapFrame.OnSwitchOrientation()")

        splitter = self.splitter
        splitter.Unsplit()
        if splitter.GetSplitMode() == wx.SPLIT_HORIZONTAL:
            splitter.SplitVertically(self.firstMapWindow, self.secondMapWindow, 0)
            self.slider = self.sliderH
            if self._mode == 'swipe':
                self._mgr.GetPane('sliderH').Show()
                self._mgr.GetPane('sliderV').Hide()
        else:
            splitter.SplitHorizontally(self.firstMapWindow, self.secondMapWindow, 0)
            self.slider = self.sliderV
            if self._mode == 'swipe':
                self._mgr.GetPane('sliderV').Show()
                self._mgr.GetPane('sliderH').Hide()
        self._mgr.Update()
        splitter.OnSashChanged(None)
        self.OnSize(None)
        self.SetRasterNames()

    def OnAddText(self, event):
        """!Double click on text overlay

        So far not implemented.
        """
        pass

    def SetViewMode(self, mode):
        """!Sets view mode.

        @param mode view mode ('swipe', 'mirror')
        """
        if self._mode == mode:
            return
        self._mode = mode
        self.toolbars['swipeMain'].SetMode(mode)
        # set window mode
        self.GetFirstWindow().SetMode(mode)
        self.GetSecondWindow().SetMode(mode)
        # hide/show slider
        if self.splitter.GetSplitMode() == wx.SPLIT_HORIZONTAL:
            self._mgr.GetPane('sliderV').Show(mode == 'swipe')
            size = self.splitter.GetSize()[1] / 2
        else:
            self._mgr.GetPane('sliderH').Show(mode == 'swipe')
            size = self.splitter.GetSize()[0] / 2
        # set sash in the middle
        self.splitter.SetSashPosition(size)
        self.slider.SetValue(size)
        self._mgr.Update()
        # enable / disable sash
        self.splitter.EnableSash(mode == 'swipe')
        # hack to make it work
        self.splitter.OnSashChanged(None)
        self.SendSizeEvent()

    def SetRasterNames(self):
        if not self._inputDialog or self._inputDialog.IsSimpleMode():
            if self.rasters['first']:
                self.GetFirstWindow().SetRasterNameText(self.rasters['first'], 101)
            if self.rasters['second']:
                self.GetSecondWindow().SetRasterNameText(self.rasters['second'], 102)
        else:
            self.GetFirstWindow().SetRasterNameText('', 101)
            self.GetSecondWindow().SetRasterNameText('', 102)

    def GetMapToolbar(self):
        """!Returns toolbar with zooming tools"""
        return self.toolbars['swipeMap']

    def IsStandalone(self):
        """!Since we do not need layer manager, we are standalone"""
        return True

    def OnHelp(self, event):
        self._giface.Help(entry = 'wxGUI.mapswipe')

    def OnCloseWindow(self, event):
        self.GetFirstMap().Clean()
        self.GetSecondMap().Clean()
        self.Destroy()


class MapSplitter(wx.SplitterWindow):
    """!Splitter window for displaying two maps"""
    def __init__(self, parent, id):
        wx.SplitterWindow.__init__(self, parent = parent, id = id,
                                   style = wx.SP_LIVE_UPDATE
                                   )
        Debug.msg(2, "MapSplitter.__init__()")
        
        self.sashWidthMin = 1
        self.sashWidthMax = 10
        self.Bind(wx.EVT_SPLITTER_SASH_POS_CHANGED, self.OnSashChanged)
        self.Bind(wx.EVT_SPLITTER_SASH_POS_CHANGING, self.OnSashChanging)
        self._moveSash = True

    def EnableSash(self, enable):
        self._moveSash = enable

    def Init(self):
        self.OnSashChanged(evt = None)
        self.SetMinimumPaneSize(0)
        self.SetSashSize(self.sashWidthMin)

    # def OnMotion(self, event):
    #     w = self.GetSashSize()
    #     w1, w2 = self.GetWindow1(), self.GetWindow2()
    #     if self.SashHitTest(event.GetX(), event.GetY(), tolerance = 20):
    #         if w == self.sashWidthMin:
    #             self.SetSashSize(self.sashWidthMax)
    #             self.SetNeedUpdating(True)
    #             w1.movingSash = True
    #             w2.movingSash = True
    #         else:
    #             w1.movingSash = False
    #             w1.movingSash = False
    #     else:
    #         if w == self.sashWidthMax:
    #             self.SetSashSize(self.sashWidthMin)
    #             self.SetNeedUpdating(True)
    #             w1.movingSash = True
    #             w2.movingSash = True
    #         else:
    #             w1.movingSash = False
    #             w2.movingSash = False

    #     event.Skip()

    def OnSashChanged(self, evt):
        Debug.msg(5, "MapSplitter.OnSashChanged()")
        if not self._moveSash:
            return
        w1, w2 = self.GetWindow1(), self.GetWindow2()
        w1.movingSash = False
        w2.movingSash = False
        
        wx.CallAfter(self.SashChanged)

    def SashChanged(self):
        Debug.msg(5, "MapSplitter.SashChanged()")

        w1, w2 = self.GetWindow1(), self.GetWindow2() 
        w1.SetImageCoords((0, 0))
        if self.GetSplitMode() == wx.SPLIT_VERTICAL:
            w = w1.GetSize()[0]
            w2.SetImageCoords((-w, 0))
        else:
            h = w1.GetSize()[1]
            w2.SetImageCoords((0, -h))

        w1.UpdateMap(render = False, renderVector = False)
        w2.UpdateMap(render = False, renderVector = False)

        pos = self.GetSashPosition()
        self.last = pos

    def OnSashChanging(self, event):
        Debug.msg(5, "MapSplitter.OnSashChanging()")
        if not self._moveSash:
            event.SetSashPosition(-1)
            return
        if not (self.GetWindowStyle() & wx.SP_LIVE_UPDATE):
            if event:
                event.Skip()
            return

        pos = self.GetSashPosition()
        dpos = pos - self.last
        self.last = pos
        if self.GetSplitMode() == wx.SPLIT_VERTICAL:
            dx = -dpos
            dy = 0
        else:
            dx = 0
            dy = -dpos
        self.GetWindow2().TranslateImage(dx, dy)

        self.GetWindow1().movingSash = True
        self.GetWindow2().movingSash = True