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