我正在尝试构建一个可以使用鼠标进行绘制的ScrolledWindow,并且它也在工作,但当用户在滚动条没有显示时在窗口上绘图时出现了令人讨厌的闪烁在“家”的位置..无闪烁的可绘制滚动窗口
要重现,运行附加的程序,向下滚动(或向右),并通过保持按住鼠标左键“涂鸦”一点。现在,然后你会看到一个闪烁..
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)
,或结合EVT_ERASE_BACKGROUND
,或使用RefreshRect
代替Refresh
,但闪烁仍然有..什么我可能会尝试下任何想法试过吗?
我的环境:是Xubuntu 9.04,wxPython的2.8.9.1 (但在Ubuntu 10.04测试过)
非常感谢您的时间!