Allow to not create wxPaintDC in EVT_PAINT handler in wxMSW.

Failure to create a wxPaintDC in EVT_PAINT handler resulted in many serious
and difficult to debug problems under wxMSW. We used to document that the user
shouldn't do it but this wasn't enough (see #11648). We could also assert if
we detected that a handler didn't create a wxPaintDC but it seems better to
just handle this case gracefully for consistency with the other platforms.

Add wxDidCreatePaintDC global variable which is reset before generating
wxPaintEvent and set to true when ::BeginPaint() is called from wxPaintDC
ctor and validate the update region of the window ourselves if it wasn't set
(meaning that wxPaintDC wasn't created).

Update the documentation to emphasize the link between EVT_PAINT handlers and
wxPaintDC but without saying that wxPaintDC object must always be created in
the handler as this is not true any more.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63229 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

This commit is contained in:

Vadim Zeitlin

2010-01-23 13:22:25 +00:00

parent 975fb32b5c

commit 7ca106e860

4 changed files with 37 additions and 10 deletions

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@@ -517,6 +517,7 @@ MSW:
 - Worked around child window and caret positioning bug (in Windows) when using
   wxBORDER_THEME in a container window.
 - Suppressed spurious character event for decimal key in numeric keypad.
 - Allow to not create wxPaintDC in EVT_PAINT handler.
 i18n:

Allow to not create wxPaintDC in EVT_PAINT handler in wxMSW.

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