我试图建立一个滚动窗口,你可以使用鼠标绘制,它也可以工作,但是当用户在窗口上绘制而滚动条不在“主页”位置时,我会出现一个令人讨厌的闪烁。。在
要复制,运行附加的程序,向下滚动一点(或向右),按住鼠标左键“涂鸦”一点。你应该不时看到闪烁的光。。在
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()
我尝试使用SetBackgroundStyle(wx.BG_STYLE_CUSTOM)
,或者绑定EVT_ERASE_BACKGROUND
,或者使用RefreshRect
代替{
我的环境:Xubuntu 9.04,wxPython 2.8.9.1 (但也在ubuntu10.04上测试过)
非常感谢您的时间!在
来自罗宾·邓恩本人:
使用Joril建议并删除Refresh(),就不再闪烁了(甚至放大了帧)。在
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