wxPython Bitmap Viewer

main.py

import wx

class View(wx.Panel):
    def __init__(self, parent):
        super(View, self).__init__(parent)
        self.SetBackgroundStyle(wx.BG_STYLE_CUSTOM)
        self.Bind(wx.EVT_SIZE, self.on_size)
        self.Bind(wx.EVT_PAINT, self.on_paint)
        self.Bind(wx.EVT_CHAR_HOOK, self.on_char)
        self.bitmap = None
    def set_bitmap(self, bitmap):
        self.bitmap = bitmap
        self.Refresh()
    def on_char(self, event):
        if event.GetKeyCode() == wx.WXK_RETURN:
            print 'Enter!'
    def on_size(self, event):
        event.Skip()
        self.Refresh()
    def on_paint(self, event):
        dc = wx.AutoBufferedPaintDC(self)
        dc.SetBackground(wx.WHITE_BRUSH)
        dc.Clear()
        if self.bitmap is None:
            return
        cw, ch = self.GetClientSize()
        bw, bh = self.bitmap.GetSize()
        x = cw / 2 - bw / 2
        y = ch / 2 - bh / 2
        dc.DrawBitmap(self.bitmap, x, y)

class Frame(wx.Frame):
    def __init__(self):
        super(Frame, self).__init__(None)
        self.view = View(self)
        self.SetTitle('Hello')
        self.SetClientSize((800, 600))
        self.Center()

def main():
    app = wx.App(None)
    frame = Frame()
    frame.Show()
    app.MainLoop()

if __name__ == '__main__':
    main()