wxWidgets/wxPython/demo/wxScrolledWindow.py

from wxPython.wx import *

import images

BUFFERED = 1

#---------------------------------------------------------------------------

class MyCanvas(wxScrolledWindow):
    def __init__(self, parent, id = -1, size = wxDefaultSize):
        wxScrolledWindow.__init__(self, parent, id, wxPoint(0, 0), size, wxSUNKEN_BORDER)

        self.lines = []
        self.maxWidth  = 1000
        self.maxHeight = 1000
        self.x = self.y = 0
        self.curLine = []
        self.drawing = False

        self.SetBackgroundColour("WHITE")
        self.SetCursor(wxStockCursor(wxCURSOR_PENCIL))
        bmp = images.getTest2Bitmap()
        mask = wxMaskColour(bmp, wxBLUE)
        bmp.SetMask(mask)
        self.bmp = bmp

        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)

        EVT_LEFT_DOWN(self, self.OnLeftButtonEvent)
        EVT_LEFT_UP(self,   self.OnLeftButtonEvent)
        EVT_MOTION(self,    self.OnLeftButtonEvent)
        EVT_PAINT(self, self.OnPaint)
        ##EVT_MOUSEWHEEL(self, self.OnWheel)


    def getWidth(self):
        return self.maxWidth

    def getHeight(self):
        return self.maxHeight


    def OnPaint(self, event):
        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, printing=False):
        dc.BeginDrawing()
        dc.SetPen(wxPen('RED'))
        dc.DrawRectangle((5, 5), (50, 50))

        dc.SetBrush(wxLIGHT_GREY_BRUSH)
        dc.SetPen(wxPen('BLUE', 4))
        dc.DrawRectangle((15, 15), (50, 50))

        dc.SetFont(wxFont(14, wxSWISS, wxNORMAL, wxNORMAL))
        dc.SetTextForeground(wxColour(0xFF, 0x20, 0xFF))
        te = dc.GetTextExtent("Hello World")
        dc.DrawText("Hello World", (60, 65))

        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)]
        dc.DrawLines(lst, -60)
        dc.SetPen(wxGREY_PEN)
        dc.DrawPolygon(lst, 75)
        dc.SetPen(wxGREEN_PEN)
        dc.DrawSpline(lst+[(100,100)])

        dc.DrawBitmap(self.bmp, (200, 20), True)
        dc.SetTextForeground(wxColour(0, 0xFF, 0x80))
        dc.DrawText("a bitmap", (200, 85))

##         dc.SetFont(wxFont(14, wxSWISS, wxNORMAL, wxNORMAL))
##         dc.SetTextForeground("BLACK")
##         dc.DrawText("TEST this STRING", 10, 200)
##         print dc.GetFullTextExtent("TEST this STRING")

        font = wxFont(20, wxSWISS, wxNORMAL, wxNORMAL)
        dc.SetFont(font)
        dc.SetTextForeground(wxBLACK)
        for a in range(0, 360, 45):
            dc.DrawRotatedText("Rotated text...", (300, 300), a)

        dc.SetPen(wxTRANSPARENT_PEN)
        dc.SetBrush(wxBLUE_BRUSH)
        dc.DrawRectangle((50,500), (50,50))
        dc.DrawRectangle((100,500), (50,50))

        dc.SetPen(wxPen('RED'))
        dc.DrawEllipticArc((200, 500), (50, 75), 0, 90)

        if not printing:
            # This has troubles when used on a print preview in wxGTK,
            # probably something to do with the pen styles and the scaling
            # it does...
            y = 20
            for style in [wxDOT, wxLONG_DASH, wxSHORT_DASH, wxDOT_DASH, wxUSER_DASH]:
                pen = wxPen("DARK ORCHID", 1, style)
                if style == wxUSER_DASH:
                    pen.SetCap(wxCAP_BUTT)
                    pen.SetDashes([1,2])
                    pen.SetColour("RED")
                dc.SetPen(pen)
                dc.DrawLine((300, y),  (400, y))
                y = y + 10

        dc.SetBrush(wxTRANSPARENT_BRUSH)
        dc.SetPen(wxPen(wxColour(0xFF, 0x20, 0xFF), 1, wxSOLID))
        dc.DrawRectangle((450, 50), (100, 100))
        old_pen = dc.GetPen()
        new_pen = wxPen("BLACK", 5)
        dc.SetPen(new_pen)
        dc.DrawRectangle((470, 70), (60, 60))
        dc.SetPen(old_pen)
        dc.DrawRectangle((490, 90), (20, 20))

        self.DrawSavedLines(dc)
        dc.EndDrawing()


    def DrawSavedLines(self, dc):
        dc.SetPen(wxPen('MEDIUM FOREST GREEN', 4))
        for line in self.lines:
            for coords in line:
                dc.DrawLine(*coords)


    def SetXY(self, event):
        self.x, self.y = self.ConvertEventCoords(event)

    def ConvertEventCoords(self, event):
        xView, yView = self.GetViewStart()
        xDelta, yDelta = self.GetScrollPixelsPerUnit()
        return (event.GetX() + (xView * xDelta),
                event.GetY() + (yView * yDelta))

    def OnLeftButtonEvent(self, event):
        if event.LeftDown():
            self.SetFocus()
            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)

            dc.BeginDrawing()
            dc.SetPen(wxPen('MEDIUM FOREST GREEN', 4))
            coords = ((self.x, self.y),  self.ConvertEventCoords(event))
            self.curLine.append(coords)
            dc.DrawLine( *coords)
            self.SetXY(event)
            dc.EndDrawing()


        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,
## but since wxScrolledWindow does this already it's not
## necessary to do it ourselves.

##     wheelScroll = 0
##     def OnWheel(self, evt):
##         delta = evt.GetWheelDelta()
##         rot = evt.GetWheelRotation()
##         linesPer = evt.GetLinesPerAction()
##         print delta, rot, linesPer
##         ws = self.wheelScroll
##         ws = ws + rot
##         lines = ws / delta
##         ws = ws - lines * delta
##         self.wheelScroll = ws
##         if lines != 0:
##             lines = lines * linesPer
##             vsx, vsy = self.GetViewStart()
##             scrollTo = vsy - lines
##             self.Scroll(-1, scrollTo)

#---------------------------------------------------------------------------

def runTest(frame, nb, log):
    win = MyCanvas(nb)
    return win

#---------------------------------------------------------------------------





overview = """\
"""




if __name__ == '__main__':
    import sys,os
    import run
    run.main(['', os.path.basename(sys.argv[0])])