I've been trying to devise a way to draw opaquely on a transparent
window frame with little success. Here is a barely working sample.
Does anyone know how this could be done better? The problems with
this example is that there is too much flicker when the window is drug
and the transparency does not update behind the text when what is
beneath changes. I plan on using this window as an instrument panel
that floats on top of a moving map, so it has to update smoothly.
Thanks in advance for any suggestions.
screenshots:
http://matrixmariner.com/ftpimages/mmg/transp1.jpg
http://matrixmariner.com/ftpimages/mmg/transp.jpg
import wx
class myframe (wx.Frame):
def __init__(self, parent):
wx.Frame.__init__ (self, parent, id = wx.ID_ANY, title =
wx.EmptyString, pos = wx.DefaultPosition, size = wx.Size( 500,300 ),
style = wx.RESIZE_BORDER|wx.SUNKEN_BORDER)
self.SetSizeHintsSz(wx.DefaultSize, wx.DefaultSize)
self.SetBackgroundColour(wx.Colour(0, 0, 0))
self.Centre(wx.BOTH)
self.Bind(wx.EVT_LEFT_DOWN, self.OnLeftDown)
self.Bind(wx.EVT_LEFT_UP, self.OnLeftUp)
self.Bind(wx.EVT_MOTION, self.OnMouseMove)
self.Bind(wx.EVT_RIGHT_UP, self.OnExit)
self.Bind(wx.EVT_PAINT, self.OnPaint)
def OnExit(self, evt):
self.SetEvtHandlerEnabled(False)
self.Destroy()
def OnLeftDown(self, evt):
parent = wx.GetTopLevelParent(self)
self.CaptureMouse()
x, y = parent.ClientToScreen(evt.GetPosition())
originx, originy = parent.GetPosition()
dx = x - originx
dy = y - originy
self.delta = ((dx, dy))
def OnLeftUp(self, evt):
if self.HasCapture():
self.ReleaseMouse()
def OnMouseMove(self, evt):
if evt.Dragging() and evt.LeftIsDown():
parent = wx.GetTopLevelParent(self)
x, y = self.ClientToScreen(evt.GetPosition())
fp = (x - self.delta[0], y - self.delta[1])
parent.Move(fp)
def GetBg(self):
x,y=self.GetPosition()
xx,yy=self.GetSizeTuple()
bmp = wx.EmptyBitmap(xx, yy)
dc = wx.MemoryDC()
dc.SelectObject(bmp)
dc.Blit(x,y,xx,yy,wx.ScreenDC(),x,y)
return bmp
def OnPaint(self, evt):
x,y=self.GetPosition()
dc = wx.ScreenDC()
bmp = self.GetBg()
brush = wx.BrushFromBitmap(bmp)
dc.SetBackground(brush)
orange = wx.Colour(255,132.0)
dc.SetTextForeground(orange)
dc.DrawText('Hello transparent window! This text is not
transparent.', x+13, y+11)
app = wx.App(False)
fr = myframe(None)
fr.SetTransparent(150)
fr.Show()
app.MainLoop()
