wxMDIParentFrame never has EVT_ERASE_BACKGROUND event

bobmanc · Post by **bobmanc** » Sat Nov 14, 2009 8:48 pm

I am trying to change the background color of the parent frame by iverriding the EVT_ERASE_BACKGROUND event but it never gets triggered. Any ideas why?

I am using wx 2.8.10 on Win7.

Code: Select all


BEGIN_EVENT_TABLE(MyFrame, wxMDIParentFrame)
    EVT_ERASE_BACKGROUND(MyFrame::OnEraseBackground)
END_EVENT_TABLE()

...

void MyFrame::OnEraseBackground( wxEraseEvent& event )
{
//never called
}

illnatured · Post by **illnatured** » Sat Nov 14, 2009 9:39 pm

You can paint a filled rectangle instead.

JimFairway · Post by **JimFairway** » Sat Nov 14, 2009 10:34 pm

Hi,

Not sure either, but you could just use wxMDIParentFrame::SetBackgroundColour

Hope that helps,

Jim

bobmanc · Post by **bobmanc** » Sat Nov 14, 2009 10:49 pm

How can I paint a rectangle if i can't get the erase event to fire?

setBackground doesn't do anything that is why i was trying to override the erase event.

JimFairway · Post by **JimFairway** » Sun Nov 15, 2009 12:15 am

Hi,

Check this entry on the wiki:
http://wiki.wxwidgets.org/FAQ#Why_are_b ... alog_boxes.

Jim

bobmanc · Post by **bobmanc** » Sun Nov 15, 2009 5:13 am

Sorry Jim,
That doesn't work either.

illnatured · Post by **illnatured** » Sun Nov 15, 2009 9:29 am

bobmanc wrote:How can I paint a rectangle if i can't get the erase event to fire?

Okay, this won't work, but there's another solution. You can create an empty panel and resize it to whole client area of the MDI parent frame.

bobmanc · Post by **bobmanc** » Sun Nov 15, 2009 2:11 pm

I think I have the solution.
You need to override the OnCreateClient call on your version of wxMDIParentFrame. You then have to override wxMDIClientWindow that has its own OnEraseBackground method. This will get called.

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wxMDIParentFrame never has EVT_ERASE_BACKGROUND event