Dragable Frame using wxPython (Phoenix)

''' pwx_drag_frame101.py
experiments with wxPython's Frame styles
create a borderless window that is dragable

for Python3 downloaded project Phoenix latest version
for instance
wxPython_Phoenix-2.9.5.81-r74058-win32-py3.3.tar.gz
from
http://wxpython.org/Phoenix/snapshot-builds/
then simply extracted the wx folder to
C:\Python33\Lib\site-packages

tested with Python27/33 and wx(Phoenix) by  vegaseat  29may2013
'''

import wx

class DragFrame(wx.Frame):
    def __init__(self):
        style = wx.CLIP_CHILDREN|wx.STAY_ON_TOP|wx.FRAME_NO_TASKBAR|\
            wx.NO_BORDER|wx.FRAME_SHAPED
        wx.Frame.__init__(self, None, size=(300, 200), style=style)

        self.Bind(wx.EVT_KEY_UP, self.on_key_press)
        self.Bind(wx.EVT_MOTION, self.on_mouse)
        self.Bind(wx.EVT_PAINT, self.on_paint)
        self.SetTransparent(200)
        self.Show(True)

    def on_key_press(self, event):
        '''
        quit if user presses Esc key (27)
        '''
        if event.GetKeyCode() == 27:
            self.Close(force=True)
        else:
            event.Skip()

    def on_mouse(self, event):
        '''
        implement dragging
        '''
        if not event.Dragging():
            self._dragPos = None
            return
        self.CaptureMouse()
        if not self._dragPos:
            self._dragPos = event.GetPosition()
        else:
            pos = event.GetPosition()
            displacement = self._dragPos - pos
            self.SetPosition( self.GetPosition() - displacement )

    def on_paint(self, event):
        # wx.PaintDC() creates a drawing canvas
        dc = wx.PaintDC(self)
        # set the canvas background
        dc.SetBackground(wx.Brush('white'))
        dc.Clear()

        # wx.Brush(color, style)
        dc.SetBrush(wx.Brush('green', wx.CROSS_HATCH))
        # apply the brush to a rectangle
        dc.DrawRectangle(0, 0, 300, 200)
        # info
        s = "Drag me! \nPress Escape to exit"
        dc.DrawText(s, 20, 15)


app = wx.App(0)
frame = DragFrame()
app.MainLoop()