Updated FloatCanvas code from Chris

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/branches/WX_2_8_BRANCH@45725 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

wxPython/wx/lib/floatcanvas/Utilities/GUI.py

@@ -0,0 +1,115 @@
+"""
+
+Part of the floatcanvas.Utilities package.
+
+This module contains assorted GUI-related utilities that can be used
+with FloatCanvas
+
+So far, they are:
+
+RubberBandBox: used to draw a RubberBand Box on the screen
+
+"""
+import wx
+from floatcanvas import FloatCanvas
+
+class RubberBandBox:
+    """
+    Class to provide a rubber band box that can be drawn on a Window
+
+    """
+
+    def __init__(self, Canvas, CallBack, Tol=5):
+
+        """
+        To initialize:
+        
+        RubberBandBox(Canvas, CallBack)
+
+        Canvas:  the FloatCanvas you want the Rubber band box to be used on
+
+        CallBack: is the method you want called when the mouse is
+                  released. That method will be called, passing in a rect
+                  parameter, where rect is: (Point, WH) of the rect in
+                  world coords.
+
+        Tol: The tolerance for the smallest rectangle allowed. defaults
+             to 5. In pixels
+
+        Methods:
+        
+        Enable() : Enables the Rubber Band Box (Binds the events)
+        
+        Disable() : Enables the Rubber Band Box (Unbinds the events)
+
+        Attributes:
+
+        CallBack: The callback function, if it's replaced you need to
+                  call Enable() again.
+                  
+        """
+
+        self.Canvas = Canvas
+        self.CallBack = CallBack
+        self.Tol = Tol
+        
+        self.Drawing = False
+        self.RBRect = None
+        self.StartPointWorld = None
+
+        return None
+
+    def Enable(self):
+        """
+        Called when you want the rubber band box to be enabled
+
+        """
+
+        # bind events:
+        self.Canvas.Bind(FloatCanvas.EVT_MOTION, self.OnMove ) 
+        self.Canvas.Bind(FloatCanvas.EVT_LEFT_DOWN, self.OnLeftDown)
+        self.Canvas.Bind(FloatCanvas.EVT_LEFT_UP, self.OnLeftUp ) 
+
+    def Disable(self):
+        """
+        Called when you don't want the rubber band box to be enabled
+
+        """
+
+        # unbind events:
+        self.Canvas.Unbind(FloatCanvas.EVT_MOTION)
+        self.Canvas.Unbind(FloatCanvas.EVT_LEFT_DOWN)
+        self.Canvas.Unbind(FloatCanvas.EVT_LEFT_UP)
+
+    def OnMove(self, event):
+        if self.Drawing:
+            x, y = self.StartPoint
+            Cornerx, Cornery = event.GetPosition()
+            w, h = ( Cornerx - x, Cornery - y)
+            if abs(w) > self.Tol and abs(h) > self.Tol:
+                # draw the RB box
+                dc = wx.ClientDC(self.Canvas)
+                dc.SetPen(wx.Pen('WHITE', 2, wx.SHORT_DASH))
+                dc.SetBrush(wx.TRANSPARENT_BRUSH)
+                dc.SetLogicalFunction(wx.XOR)
+                if self.RBRect:
+                    dc.DrawRectangle(*self.RBRect)
+                self.RBRect = (x, y, w, h )
+                dc.DrawRectangle(*self.RBRect)
+        event.Skip() # skip so that other events can catch these
+
+    def OnLeftDown(self, event):
+        # Start drawing
+        self.Drawing = True
+        self.StartPoint = event.GetPosition()
+        self.StartPointWorld = event.Coords
+    
+    def OnLeftUp(self, event):
+        # Stop Drawing
+        if self.Drawing:
+            self.Drawing = False
+            if self.RBRect:
+                WH = event.Coords - self.StartPointWorld
+                wx.CallAfter(self.CallBack, (self.StartPointWorld, WH))
+        self.RBRect = None
+        self.StartPointWorld = None