X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/c594325333f3e154ee51edd918ad9cb0582203a7..ccdcde00d9ae27ca20ff6c3c9495918a0ec725aa:/wxPython/demo/wxScrolledWindow.py?ds=inline

diff --git a/wxPython/demo/wxScrolledWindow.py b/wxPython/demo/wxScrolledWindow.py
index 15806b1319..ad1fa7beca 100644
--- a/wxPython/demo/wxScrolledWindow.py
+++ b/wxPython/demo/wxScrolledWindow.py
@@ -3,6 +3,8 @@ from wxPython.wx import *
 
 import images
 
+BUFFERED = 1
+
 #---------------------------------------------------------------------------
 
 class MyCanvas(wxScrolledWindow):
@@ -12,8 +14,11 @@ class MyCanvas(wxScrolledWindow):
         self.lines = []
         self.maxWidth  = 1000
         self.maxHeight = 1000
+        self.x = self.y = 0
+        self.curLine = []
+        self.drawing = false
 
-        self.SetBackgroundColour(wxNamedColor("WHITE"))
+        self.SetBackgroundColour("WHITE")
         EVT_LEFT_DOWN(self, self.OnLeftButtonEvent)
         EVT_LEFT_UP(self,   self.OnLeftButtonEvent)
         EVT_MOTION(self,    self.OnLeftButtonEvent)
@@ -27,6 +32,14 @@ class MyCanvas(wxScrolledWindow):
 
         self.SetScrollbars(20, 20, self.maxWidth/20, self.maxHeight/20)
 
+        if BUFFERED:
+            # Initialize the buffer bitmap.  No real DC is needed at this point.
+            self.buffer = wxEmptyBitmap(self.maxWidth, self.maxHeight)
+            dc = wxBufferedDC(None, self.buffer)
+            dc.SetBackground(wxBrush(self.GetBackgroundColour()))
+            dc.Clear()
+            self.DoDrawing(dc)
+
 
     def getWidth(self):
         return self.maxWidth
@@ -36,18 +49,27 @@ class MyCanvas(wxScrolledWindow):
 
 
     def OnPaint(self, event):
-        dc = wxPaintDC(self)
-        self.PrepareDC(dc)
-        self.DoDrawing(dc)
+        if BUFFERED:
+            # Create a buffered paint DC.  It will create the real
+            # wxPaintDC and then blit the bitmap to it when dc is
+            # deleted.  Since we don't need to draw anything else
+            # here that's all there is to it.
+            dc = wxBufferedPaintDC(self, self.buffer)
+        else:
+            dc = wxPaintDC(self)
+            self.PrepareDC(dc)
+            # since we're not buffering in this case, we have to
+            # paint the whole window, potentially very time consuming.
+            self.DoDrawing(dc)
 
 
     def DoDrawing(self, dc):
         dc.BeginDrawing()
-        dc.SetPen(wxPen(wxNamedColour('RED')))
+        dc.SetPen(wxPen('RED'))
         dc.DrawRectangle(5, 5, 50, 50)
 
         dc.SetBrush(wxLIGHT_GREY_BRUSH)
-        dc.SetPen(wxPen(wxNamedColour('BLUE'), 4))
+        dc.SetPen(wxPen('BLUE', 4))
         dc.DrawRectangle(15, 15, 50, 50)
 
         dc.SetFont(wxFont(14, wxSWISS, wxNORMAL, wxNORMAL))
@@ -55,7 +77,7 @@ class MyCanvas(wxScrolledWindow):
         te = dc.GetTextExtent("Hello World")
         dc.DrawText("Hello World", 60, 65)
 
-        dc.SetPen(wxPen(wxNamedColour('VIOLET'), 4))
+        dc.SetPen(wxPen('VIOLET', 4))
         dc.DrawLine(5, 65+te[1], 60+te[0], 65+te[1])
 
         lst = [(100,110), (150,110), (150,160), (100,160)]
@@ -80,7 +102,7 @@ class MyCanvas(wxScrolledWindow):
         dc.DrawRectangle(50,500,50,50)
         dc.DrawRectangle(100,500,50,50)
 
-        dc.SetPen(wxPen(wxNamedColour('RED')))
+        dc.SetPen(wxPen('RED'))
         dc.DrawEllipticArc(200, 500, 50, 75, 0, 90)
 
         y = 20
@@ -93,7 +115,7 @@ class MyCanvas(wxScrolledWindow):
             dc.DrawLine(300, y, 400, y)
             y = y + 10
 
-        dc.SetBrush(wxNullBrush)
+        dc.SetBrush(wxTRANSPARENT_BRUSH)
         dc.SetPen(wxPen(wxColour(0xFF, 0x20, 0xFF), 1, wxSOLID))
         dc.DrawRectangle(450, 50, 100, 100)
         old_pen = dc.GetPen()
@@ -103,14 +125,12 @@ class MyCanvas(wxScrolledWindow):
         dc.SetPen(old_pen)
         dc.DrawRectangle(490, 90, 20, 20)
 
-
         self.DrawSavedLines(dc)
         dc.EndDrawing()
 
 
-
     def DrawSavedLines(self, dc):
-        dc.SetPen(wxPen(wxNamedColour('MEDIUM FOREST GREEN'), 4))
+        dc.SetPen(wxPen('MEDIUM FOREST GREEN', 4))
         for line in self.lines:
             for coords in line:
                 apply(dc.DrawLine, coords)
@@ -130,22 +150,33 @@ class MyCanvas(wxScrolledWindow):
             self.SetXY(event)
             self.curLine = []
             self.CaptureMouse()
+            self.drawing = true
+
+        elif event.Dragging() and self.drawing:
+            if BUFFERED:
+                # If doing buffered drawing, create the buffered DC, giving it
+                # it a real DC to blit to when done.
+                cdc = wxClientDC(self)
+                self.PrepareDC(cdc)
+                dc = wxBufferedDC(cdc, self.buffer)
+            else:
+                dc = wxClientDC(self)
+                self.PrepareDC(dc)
 
-        elif event.Dragging():
-            dc = wxClientDC(self)
-            self.PrepareDC(dc)
             dc.BeginDrawing()
-            dc.SetPen(wxPen(wxNamedColour('MEDIUM FOREST GREEN'), 4))
+            dc.SetPen(wxPen('MEDIUM FOREST GREEN', 4))
             coords = (self.x, self.y) + self.ConvertEventCoords(event)
             self.curLine.append(coords)
             apply(dc.DrawLine, coords)
             self.SetXY(event)
             dc.EndDrawing()
 
-        elif event.LeftUp():
+
+        elif event.LeftUp() and self.drawing:
             self.lines.append(self.curLine)
             self.curLine = []
             self.ReleaseMouse()
+            self.drawing = false
 
 
 ## This is an example of what to do for the EVT_MOUSEWHEEL event,