wxPython/demo/wxScrolledWindow.py

   1
   2 from wxPython.wx import *
   3
   4 import images
   5
   6 BUFFERED = 1
   7
   8 #---------------------------------------------------------------------------
   9
  10 class MyCanvas(wxScrolledWindow):
  11     def __init__(self, parent, id = -1, size = wxDefaultSize):
  12         wxScrolledWindow.__init__(self, parent, id, wxPoint(0, 0), size, wxSUNKEN_BORDER)
  13
  14         self.lines = []
  15         self.maxWidth  = 1000
  16         self.maxHeight = 1000
  17         self.x = self.y = 0
  18         self.curLine = []
  19         self.drawing = False
  20
  21         self.SetBackgroundColour("WHITE")
  22         self.SetCursor(wxStockCursor(wxCURSOR_PENCIL))
  23         bmp = images.getTest2Bitmap()
  24         mask = wxMaskColour(bmp, wxBLUE)
  25         bmp.SetMask(mask)
  26         self.bmp = bmp
  27
  28         self.SetScrollbars(20, 20, self.maxWidth/20, self.maxHeight/20)
  29
  30         if BUFFERED:
  31             # Initialize the buffer bitmap.  No real DC is needed at this point.
  32             self.buffer = wxEmptyBitmap(self.maxWidth, self.maxHeight)
  33             dc = wxBufferedDC(None, self.buffer)
  34             dc.SetBackground(wxBrush(self.GetBackgroundColour()))
  35             dc.Clear()
  36             self.DoDrawing(dc)
  37
  38         EVT_LEFT_DOWN(self, self.OnLeftButtonEvent)
  39         EVT_LEFT_UP(self,   self.OnLeftButtonEvent)
  40         EVT_MOTION(self,    self.OnLeftButtonEvent)
  41         EVT_PAINT(self, self.OnPaint)
  42         ##EVT_MOUSEWHEEL(self, self.OnWheel)
  43
  44
  45     def getWidth(self):
  46         return self.maxWidth
  47
  48     def getHeight(self):
  49         return self.maxHeight
  50
  51
  52     def OnPaint(self, event):
  53         if BUFFERED:
  54             # Create a buffered paint DC.  It will create the real
  55             # wxPaintDC and then blit the bitmap to it when dc is
  56             # deleted.  Since we don't need to draw anything else
  57             # here that's all there is to it.
  58             dc = wxBufferedPaintDC(self, self.buffer)
  59         else:
  60             dc = wxPaintDC(self)
  61             self.PrepareDC(dc)
  62             # since we're not buffering in this case, we have to
  63             # paint the whole window, potentially very time consuming.
  64             self.DoDrawing(dc)
  65
  66
  67     def DoDrawing(self, dc):
  68         dc.BeginDrawing()
  69         dc.SetPen(wxPen('RED'))
  70         dc.DrawRectangle(5, 5, 50, 50)
  71
  72         dc.SetBrush(wxLIGHT_GREY_BRUSH)
  73         dc.SetPen(wxPen('BLUE', 4))
  74         dc.DrawRectangle(15, 15, 50, 50)
  75
  76         dc.SetFont(wxFont(14, wxSWISS, wxNORMAL, wxNORMAL))
  77         dc.SetTextForeground(wxColour(0xFF, 0x20, 0xFF))
  78         te = dc.GetTextExtent("Hello World")
  79         dc.DrawText("Hello World", 60, 65)
  80
  81         dc.SetPen(wxPen('VIOLET', 4))
  82         dc.DrawLine(5, 65+te[1], 60+te[0], 65+te[1])
  83
  84         lst = [(100,110), (150,110), (150,160), (100,160)]
  85         dc.DrawLines(lst, -60)
  86         dc.SetPen(wxGREY_PEN)
  87         dc.DrawPolygon(lst, 75)
  88         dc.SetPen(wxGREEN_PEN)
  89         dc.DrawSpline(lst+[(100,100)])
  90
  91         dc.DrawBitmap(self.bmp, 200, 20, True)
  92         dc.SetTextForeground(wxColour(0, 0xFF, 0x80))
  93         dc.DrawText("a bitmap", 200, 85)
  94
  95         font = wxFont(20, wxSWISS, wxNORMAL, wxNORMAL)
  96         dc.SetFont(font)
  97         dc.SetTextForeground(wxBLACK)
  98         for a in range(0, 360, 45):
  99             dc.DrawRotatedText("Rotated text...", 300, 300, a)
 100
 101         dc.SetPen(wxTRANSPARENT_PEN)
 102         dc.SetBrush(wxBLUE_BRUSH)
 103         dc.DrawRectangle(50,500,50,50)
 104         dc.DrawRectangle(100,500,50,50)
 105
 106         dc.SetPen(wxPen('RED'))
 107         dc.DrawEllipticArc(200, 500, 50, 75, 0, 90)
 108
 109         y = 20
 110         for style in [wxDOT, wxLONG_DASH, wxSHORT_DASH, wxDOT_DASH, wxUSER_DASH]:
 111             pen = wxPen("DARK ORCHID", 1, style)
 112             if style == wxUSER_DASH:
 113                 pen.SetCap(wxCAP_BUTT)
 114                 pen.SetDashes([1,2])
 115                 pen.SetColour("RED")
 116             dc.SetPen(pen)
 117             dc.DrawLine(300, y, 400, y)
 118             y = y + 10
 119
 120         dc.SetBrush(wxTRANSPARENT_BRUSH)
 121         dc.SetPen(wxPen(wxColour(0xFF, 0x20, 0xFF), 1, wxSOLID))
 122         dc.DrawRectangle(450, 50, 100, 100)
 123         old_pen = dc.GetPen()
 124         new_pen = wxPen("BLACK", 5)
 125         dc.SetPen(new_pen)
 126         dc.DrawRectangle(470, 70, 60, 60)
 127         dc.SetPen(old_pen)
 128         dc.DrawRectangle(490, 90, 20, 20)
 129
 130         self.DrawSavedLines(dc)
 131         dc.EndDrawing()
 132
 133
 134     def DrawSavedLines(self, dc):
 135         dc.SetPen(wxPen('MEDIUM FOREST GREEN', 4))
 136         for line in self.lines:
 137             for coords in line:
 138                 apply(dc.DrawLine, coords)
 139
 140
 141     def SetXY(self, event):
 142         self.x, self.y = self.ConvertEventCoords(event)
 143
 144     def ConvertEventCoords(self, event):
 145         xView, yView = self.GetViewStart()
 146         xDelta, yDelta = self.GetScrollPixelsPerUnit()
 147         return (event.GetX() + (xView * xDelta),
 148                 event.GetY() + (yView * yDelta))
 149
 150     def OnLeftButtonEvent(self, event):
 151         if event.LeftDown():
 152             self.SetFocus()
 153             self.SetXY(event)
 154             self.curLine = []
 155             self.CaptureMouse()
 156             self.drawing = True
 157
 158         elif event.Dragging() and self.drawing:
 159             if BUFFERED:
 160                 # If doing buffered drawing, create the buffered DC, giving it
 161                 # it a real DC to blit to when done.
 162                 cdc = wxClientDC(self)
 163                 self.PrepareDC(cdc)
 164                 dc = wxBufferedDC(cdc, self.buffer)
 165             else:
 166                 dc = wxClientDC(self)
 167                 self.PrepareDC(dc)
 168
 169             dc.BeginDrawing()
 170             dc.SetPen(wxPen('MEDIUM FOREST GREEN', 4))
 171             coords = (self.x, self.y) + self.ConvertEventCoords(event)
 172             self.curLine.append(coords)
 173             apply(dc.DrawLine, coords)
 174             self.SetXY(event)
 175             dc.EndDrawing()
 176
 177
 178         elif event.LeftUp() and self.drawing:
 179             self.lines.append(self.curLine)
 180             self.curLine = []
 181             self.ReleaseMouse()
 182             self.drawing = False
 183
 184
 185 ## This is an example of what to do for the EVT_MOUSEWHEEL event,
 186 ## but since wxScrolledWindow does this already it's not
 187 ## necessary to do it ourselves.
 188
 189 ##     wheelScroll = 0
 190 ##     def OnWheel(self, evt):
 191 ##         delta = evt.GetWheelDelta()
 192 ##         rot = evt.GetWheelRotation()
 193 ##         linesPer = evt.GetLinesPerAction()
 194 ##         print delta, rot, linesPer
 195 ##         ws = self.wheelScroll
 196 ##         ws = ws + rot
 197 ##         lines = ws / delta
 198 ##         ws = ws - lines * delta
 199 ##         self.wheelScroll = ws
 200 ##         if lines != 0:
 201 ##             lines = lines * linesPer
 202 ##             vsx, vsy = self.GetViewStart()
 203 ##             scrollTo = vsy - lines
 204 ##             self.Scroll(-1, scrollTo)
 205
 206 #---------------------------------------------------------------------------
 207
 208 def runTest(frame, nb, log):
 209     win = MyCanvas(nb)
 210     return win
 211
 212 #---------------------------------------------------------------------------
 213
 214
 215
 216
 217
 218 overview = """\
 219 """
 220
 221
 222
 223
 224 if __name__ == '__main__':
 225     import sys,os
 226     import run
 227     run.main(['', os.path.basename(sys.argv[0])])
 228