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"""
A simple sample of using a wx.Overlay to draw a rubberband effect
"""
import wx
print(wx.version())
class TestPanel(wx.Panel):
def __init__(self, *args, **kw):
wx.Panel.__init__(self, *args, **kw)
self.Bind(wx.EVT_PAINT, self.OnPaint)
self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
self.Bind(wx.EVT_LEFT_UP, self.OnLeftUp)
self.Bind(wx.EVT_MOTION, self.OnMouseMove)
self.startPos = None
self.overlay = wx.Overlay()
wx.TextCtrl(self, pos=(140,20))
def OnPaint(self, evt):
# Just some simple stuff to paint in the window for an example
dc = wx.PaintDC(self)
dc.SetBackground(wx.Brush("sky blue"))
dc.Clear()
dc.DrawLabel("Drag the mouse across this window to see \n"
"a rubber-band effect using wx.Overlay",
(140, 50, -1, -1))
coords = ((40,40),(200,220),(210,120),(120,300))
dc = wx.GCDC(dc)
dc.SetPen(wx.Pen("red", 2))
dc.SetBrush(wx.CYAN_BRUSH)
dc.DrawPolygon(coords)
def OnLeftDown(self, evt):
# Capture the mouse and save the starting position for the
# rubber-band
self.CaptureMouse()
self.startPos = evt.GetPosition()
def OnMouseMove(self, evt):
if evt.Dragging() and evt.LeftIsDown():
rect = wx.Rect(topLeft=self.startPos, bottomRight=evt.GetPosition())
# Draw the rubber-band rectangle using an overlay so it
# will manage keeping the rectangle and the former window
# contents separate.
dc = wx.ClientDC(self)
odc = wx.DCOverlay(self.overlay, dc)
odc.Clear()
# Mac's DC is already the same as a GCDC, and it causes
# problems with the overlay if we try to use an actual
# wx.GCDC so don't try it.
if 'wxMac' not in wx.PlatformInfo:
dc = wx.GCDC(dc)
dc.SetPen(wx.Pen("black", 2))
dc.SetBrush(wx.Brush(wx.Colour(0xC0, 0xC0, 0xC0, 0x80)))
dc.DrawRectangle(rect)
def OnLeftUp(self, evt):
if self.HasCapture():
self.ReleaseMouse()
self.startPos = None
# When the mouse is released we reset the overlay and it
# restores the former content to the window.
dc = wx.ClientDC(self)
odc = wx.DCOverlay(self.overlay, dc)
odc.Clear()
del odc
self.overlay.Reset()
app = wx.App(redirect=False)
frm = wx.Frame(None, title="wx.Overlay Test", size=(450,450))
#frm.SetDoubleBuffered(True)
pnl = TestPanel(frm)
frm.Show()
app.MainLoop()
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