/[thuban]/branches/WIP-pyshapelib-bramz/Thuban/UI/view.py
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revision 433 by jonathan, Mon Feb 24 18:47:49 2003 UTC revision 535 by bh, Fri Mar 14 20:42:18 2003 UTC
# Line 32  from Thuban.Model.label import ALIGN_CEN Line 32  from Thuban.Model.label import ALIGN_CEN
32  from Thuban.Lib.connector import Publisher  from Thuban.Lib.connector import Publisher
33  from Thuban.Model.color import Color  from Thuban.Model.color import Color
34    
35    from selection import Selection
36  from renderer import ScreenRenderer, PrinterRender  from renderer import ScreenRenderer, PrinterRender
37    
38  import labeldialog  import labeldialog
39    
40  from messages import SELECTED_SHAPE, VIEW_POSITION  from messages import LAYER_SELECTED, SHAPES_SELECTED, VIEW_POSITION
41    
42    
43  #  #
# Line 257  class MapCanvas(wxWindow, Publisher): Line 258  class MapCanvas(wxWindow, Publisher):
258    
259      """A widget that displays a map and offers some interaction"""      """A widget that displays a map and offers some interaction"""
260    
261      def __init__(self, parent, winid, interactor):      # Some messages that can be subscribed/unsubscribed directly through
262        # the MapCanvas come in fact from other objects. This is a map to
263        # map those messages to the names of the instance variables they
264        # actually come from. This delegation is implemented in the
265        # Subscribe and unsubscribed methods
266        delegated_messages = {LAYER_SELECTED: "selection",
267                              SHAPES_SELECTED: "selection"}
268    
269        # Methods delegated to some instance variables. The delegation is
270        # implemented in the __getattr__ method.
271        delegated_methods = {"SelectLayer": "selection",
272                             "SelectShapes": "selection",
273                             "SelectedLayer": "selection",
274                             "HasSelectedLayer": "selection"}
275    
276        def __init__(self, parent, winid):
277          wxWindow.__init__(self, parent, winid)          wxWindow.__init__(self, parent, winid)
278          self.SetBackgroundColour(wxColour(255, 255, 255))          self.SetBackgroundColour(wxColour(255, 255, 255))
279    
# Line 283  class MapCanvas(wxWindow, Publisher): Line 299  class MapCanvas(wxWindow, Publisher):
299          # the bitmap serving as backing store          # the bitmap serving as backing store
300          self.bitmap = None          self.bitmap = None
301    
302          # the interactor          # the selection
303          self.interactor = interactor          self.selection = Selection()
304          self.interactor.Subscribe(SELECTED_SHAPE, self.shape_selected)          self.selection.Subscribe(SHAPES_SELECTED , self.shape_selected)
305    
306          # keep track of which layers/shapes are selected to make sure we          # keep track of which layers/shapes are selected to make sure we
307          # only redraw when necessary          # only redraw when necessary
# Line 304  class MapCanvas(wxWindow, Publisher): Line 320  class MapCanvas(wxWindow, Publisher):
320          wxWindow.__del__(self)          wxWindow.__del__(self)
321          Publisher.__del__(self)          Publisher.__del__(self)
322    
323        def Subscribe(self, channel, *args):
324            """Extend the inherited method to handle delegated messages.
325    
326            If channel is one of the delegated messages call the appropriate
327            object's Subscribe method. Otherwise just call the inherited
328            method.
329            """
330            if channel in self.delegated_messages:
331                object = getattr(self, self.delegated_messages[channel])
332                object.Subscribe(channel, *args)
333            else:
334                Publisher.Subscribe(self, channel, *args)
335    
336        def Unsubscribe(self, channel, *args):
337            """Extend the inherited method to handle delegated messages.
338    
339            If channel is one of the delegated messages call the appropriate
340            object's Unsubscribe method. Otherwise just call the inherited
341            method.
342            """
343            if channel in self.delegated_messages:
344                object = getattr(self, self.delegated_messages[channel])
345                object.Unsubscribe(channel, *args)
346            else:
347                Publisher.Unsubscribe(self, channel, *args)
348    
349        def __getattr__(self, attr):
350            if attr in self.delegated_methods:
351                return getattr(getattr(self, self.delegated_methods[attr]), attr)
352            raise AttributeError(attr)
353    
354      def OnPaint(self, event):      def OnPaint(self, event):
355          dc = wxPaintDC(self)          dc = wxPaintDC(self)
356          if self.map is not None and self.map.HasLayers():          if self.map is not None and self.map.HasLayers():
# Line 340  class MapCanvas(wxWindow, Publisher): Line 387  class MapCanvas(wxWindow, Publisher):
387              dc.SetPen(wx.wxTRANSPARENT_PEN)              dc.SetPen(wx.wxTRANSPARENT_PEN)
388              dc.DrawRectangle(0, 0, width, height)              dc.DrawRectangle(0, 0, width, height)
389    
390              if 1: #self.interactor.selected_map is self.map:              selected_layer = self.selection.SelectedLayer()
391                  selected_layer = self.interactor.selected_layer              selected_shapes = self.selection.SelectedShapes()
                 selected_shape = self.interactor.selected_shape  
             else:  
                 selected_layer = None  
                 selected_shape = None  
392    
393              # draw the map into the bitmap              # draw the map into the bitmap
394              renderer = ScreenRenderer(dc, self.scale, self.offset)              renderer = ScreenRenderer(dc, self.scale, self.offset)
# Line 353  class MapCanvas(wxWindow, Publisher): Line 396  class MapCanvas(wxWindow, Publisher):
396              # Pass the entire bitmap as update region to the renderer.              # Pass the entire bitmap as update region to the renderer.
397              # We're redrawing the whole bitmap, after all.              # We're redrawing the whole bitmap, after all.
398              renderer.RenderMap(self.map, (0, 0, width, height),              renderer.RenderMap(self.map, (0, 0, width, height),
399                                 selected_layer, selected_shape)                                 selected_layer, selected_shapes)
400    
401              dc.EndDrawing()              dc.EndDrawing()
402              dc.SelectObject(wx.wxNullBitmap)              dc.SelectObject(wx.wxNullBitmap)
# Line 382  class MapCanvas(wxWindow, Publisher): Line 425  class MapCanvas(wxWindow, Publisher):
425              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,              self.map.Unsubscribe(MAP_PROJECTION_CHANGED,
426                                   self.projection_changed)                                   self.projection_changed)
427          self.map = map          self.map = map
428            self.selection.ClearSelection()
429          if self.map is not None:          if self.map is not None:
430              for channel in redraw_channels:              for channel in redraw_channels:
431                  self.map.Subscribe(channel, self.full_redraw)                  self.map.Subscribe(channel, self.full_redraw)
# Line 428  class MapCanvas(wxWindow, Publisher): Line 472  class MapCanvas(wxWindow, Publisher):
472    
473      def FitRectToWindow(self, rect):      def FitRectToWindow(self, rect):
474          """Fit the rectangular region given by rect into the window.          """Fit the rectangular region given by rect into the window.
475            
476          Set scale so that rect (in projected coordinates) just fits into          Set scale so that rect (in projected coordinates) just fits into
477          the window and center it.          the window and center it.
478          """          """
# Line 446  class MapCanvas(wxWindow, Publisher): Line 490  class MapCanvas(wxWindow, Publisher):
490    
491      def FitMapToWindow(self):      def FitMapToWindow(self):
492          """Fit the map to the window          """Fit the map to the window
493            
494          Set the scale so that the map fits exactly into the window and          Set the scale so that the map fits exactly into the window and
495          center it in the window.          center it in the window.
496          """          """
# Line 597  class MapCanvas(wxWindow, Publisher): Line 641  class MapCanvas(wxWindow, Publisher):
641          self.full_redraw()          self.full_redraw()
642    
643      def shape_selected(self, layer, shape):      def shape_selected(self, layer, shape):
644          """Redraw the map.          """Receiver for the SHAPES_SELECTED messages. Redraw the map."""
645            # The selection object takes care that it only issues
646          Receiver for the SELECTED_SHAPE messages. Try to redraw only          # SHAPES_SELECTED messages when the set of selected shapes has
647          when necessary.          # actually changed, so we can do a full redraw unconditionally.
648          """          # FIXME: We should perhaps try to limit the redraw to the are
649          # A redraw is necessary when the display has to change, which          # actually covered by the shapes before and after the selection
650          # means that either the status changes from having no selection          # change.
651          # to having a selection shape or vice versa, or when the fact          self.full_redraw()
         # whether there is a selection at all doesn't change, when the  
         # shape which is selected has changed (which means that layer or  
         # shapeid changes).  
         if ((shape is not None or self.last_selected_shape is not None)  
             and (shape != self.last_selected_shape  
                  or layer != self.last_selected_layer)):  
             self.full_redraw()  
   
         # remember the selection so we can compare when it changes again.  
         self.last_selected_layer = layer  
         self.last_selected_shape = shape  
652    
653      def unprojected_rect_around_point(self, x, y, dist):      def unprojected_rect_around_point(self, x, y, dist):
654          """return a rect dist pixels around (x, y) in unprojected corrdinates          """return a rect dist pixels around (x, y) in unprojected corrdinates
# Line 709  class MapCanvas(wxWindow, Publisher): Line 742  class MapCanvas(wxWindow, Publisher):
742    
743              filled = layer.GetClassification().GetDefaultFill() \              filled = layer.GetClassification().GetDefaultFill() \
744                       is not Color.None                       is not Color.None
745              stroked = layer.GetClassification().GetDefaultStroke() \              stroked = layer.GetClassification().GetDefaultLineColor() \
746                        is not Color.None                        is not Color.None
747    
748              layer_proj = layer.projection              layer_proj = layer.projection
# Line 789  class MapCanvas(wxWindow, Publisher): Line 822  class MapCanvas(wxWindow, Publisher):
822          # to deselect the currently selected layer, so we simply select          # to deselect the currently selected layer, so we simply select
823          # the already selected layer again.          # the already selected layer again.
824          if layer is None:          if layer is None:
825              layer = self.interactor.SelectedLayer()              layer = self.selection.SelectedLayer()
826          self.interactor.SelectLayerAndShape(layer, shape)              shapes = []
827            else:
828                shapes = [shape]
829            self.selection.SelectShapes(layer, shapes)
830          return result          return result
831    
832      def LabelShapeAt(self, x, y):      def LabelShapeAt(self, x, y):
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