我正在嘗試構建一個可以使用鼠標進行繪製的ScrolledWindow,並且它也在工作,但當用戶在滾動條沒有顯示時在窗口上繪圖時出現了令人討厭的閃爍在「家」的位置..無閃爍的可繪製滾動窗口
要重現,運行附加的程序,向下滾動(或向右),並通過保持按住鼠標左鍵「塗鴉」一點。現在,然後你會看到一個閃爍..
import wx
class MainFrame(wx.Frame):
""" Just a frame with a DrawPane """
def __init__(self, *args, **kw):
wx.Frame.__init__(self, *args, **kw)
s = wx.BoxSizer(wx.VERTICAL)
s.Add(DrawPane(self), 1, wx.EXPAND)
self.SetSizer(s)
########################################################################
class DrawPane(wx.PyScrolledWindow):
""" A PyScrolledWindow with a 1000x1000 drawable area """
VSIZE = (1000, 1000)
def __init__(self, *args, **kw):
wx.PyScrolledWindow.__init__(self, *args, **kw)
self.SetScrollbars(10, 10, 100, 100)
self.prepare_buffer()
self.Bind(wx.EVT_PAINT, self.on_paint)
self.Bind(wx.EVT_LEFT_DOWN, self.on_mouse_down)
self.Bind(wx.EVT_MOTION, self.on_motion)
def prepare_buffer(self):
self.buffer = wx.EmptyBitmap(*DrawPane.VSIZE)
dc = wx.BufferedDC(None, self.buffer)
dc.Clear()
dc.DrawLine(0, 0, 999, 999) # Draw something to better show the flicker problem
def on_paint(self, evt):
dc = wx.BufferedPaintDC(self, self.buffer, wx.BUFFER_VIRTUAL_AREA)
def on_mouse_down(self, evt):
self.mouse_pos = self.CalcUnscrolledPosition(evt.GetPosition()).Get()
def on_motion(self, evt):
if evt.Dragging() and evt.LeftIsDown():
dc = wx.BufferedDC(wx.ClientDC(self), self.buffer)
newpos = self.CalcUnscrolledPosition(evt.GetPosition()).Get()
coords = self.mouse_pos + newpos
dc.DrawLine(*coords)
self.mouse_pos = newpos
self.Refresh()
if __name__ == "__main__":
app = wx.PySimpleApp()
wx.InitAllImageHandlers()
MainFrame(None).Show()
app.MainLoop()
我使用SetBackgroundStyle(wx.BG_STYLE_CUSTOM)
,或結合EVT_ERASE_BACKGROUND
,或使用RefreshRect
代替Refresh
,但閃爍仍然有..什麼我可能會嘗試下任何想法試過嗎?
我的環境:是Xubuntu 9.04,wxPython的2.8.9.1 (但在Ubuntu 10.04測試過)
非常感謝您的時間!