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06.20.2008 at 09:33PM PDT, ID: 23504174
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Capture Windows form paint messages

Asked by superg65 in Visual Basic Programming, Windows Programming

Tags: vb6, Windows Programming

Hi Experts

I have a  standard frame on a form with a background drawn via BitBlt.  The form is maximised and covers the whole desktop area but the frame is only covering a part of my form. If another application gets the focus (ie the user decides to switch apps) and is moved or resized over the frame, the background portion of the frame where the other application has overlayed it gets redrawn. The redrawn portion is painted with the background colour property colour and not my BitBlt  image.

What I want to do is either
a) detect that another app has focus and is redrawn, moved  or sized over my app (in particular over my frame but just over my app would be enough); or
b) detect that part of my frame has been redrawn.

Once I have this I will call a redraw of my frame backgound BitBlt to repair the portion redrawn because of the other app.

I do not understand enough about how Windows redraws the portion under an app that is resizing to know how to do this.

Looking for a subclass/hook solution or ideas on which windows message to look for. No timer stuff please.

Thanks in advance
GraemeStart Free Trial
 
Keywords: Capture Windows form paint messages
Title
1 paint problem
2 Window painting
3 Stop JPanel paint being called when cr…
4 Window Painting
5 erase() and paint() and render()
6 Maximiaing paint() performance.
 
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[+][-]06.20.2008 at 11:54PM PDT, ID: 21836671

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[+][-]06.21.2008 at 03:09PM PDT, ID: 21839032

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[+][-]06.21.2008 at 04:02PM PDT, ID: 21839153

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[+][-]06.21.2008 at 04:22PM PDT, ID: 21839191

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[+][-]06.21.2008 at 08:05PM PDT, ID: 21839549

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About this solution

Zones: Visual Basic Programming, Windows Programming
Tags: vb6, Windows Programming
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Solution Provided By: zzzzzooc
Participating Experts: 2
Solution Grade: A
 
 
 
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