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wx.PaintEvent¶
A paint event is sent when a window’s contents needs to be repainted.
The handler of this event must create a wx.PaintDC object and use it for painting the window contents. For example:
def OnPaint(self, event):
dc = wx.PaintDC(self)
DrawMyDocument(dc)
Notice that you must not create other kinds of wx.DC (e.g. wx.ClientDC or wx.WindowDC) in EVT_PAINT handlers and also don’t create wx.PaintDC outside of this event handlers.
You can optimize painting by retrieving the rectangles that have been damaged and only repainting these. The rectangles are in terms of the client area, and are unscrolled, so you will need to do some calculations using the current view position to obtain logical, scrolled units. Here is an example of using the wx.RegionIterator class:
# Called when window needs to be repainted.
def OnPaint(self, event):
dc = wx.PaintDC(self)
# Find out where the window is scrolled to
vbX, vbY = self.GetViewStart()
# get the update rect list
upd = wx.RegionIterator(self.GetUpdateRegion())
while upd.HaveRects():
rect = upd.GetRect()
# Repaint this rectangle
PaintRectangle(rect, dc)
upd.Next()
Events Emitted by this Class¶
Handlers bound for the following event types will receive a wx.PaintEvent parameter.
Note
Please notice that in general it is impossible to change the drawing of a standard control (such as wx.Button) and so you shouldn’t attempt to handle paint events for them as even if it might work on some platforms, this is inherently not portable and won’t work everywhere.
Class Hierarchy¶
Inheritance diagram for class
PaintEvent:
Methods Summary¶
__init__
|
Constructor for exclusive use of wxWidgets itself. |
Class API¶
-
class wx.PaintEvent(Event)¶
Possible constructors:
PaintEvent(window) -> None
A paint event is sent when a window’s contents needs to be repainted.
Methods¶
-
__init__(self, window)¶
Constructor for exclusive use of wxWidgets itself.
Note that the objects of this class can not be created from application code, they’re only created by the library itself. If you need a window to be repainted, use wx.Window.Refresh instead of trying to manually create an event of this class.
- Parameters:
window (wx.Window)
- Return type:
None
