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12.24.2007 at 01:11PM PST, ID: 23041891
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6.6

problem with painting a custom button on a form with a background image

Asked by plevintampabay in Microsoft Visual C#.Net, C# Programming Language, .NET Framework 2.x

Tags: , , , ,

In C# .NET 2.0 (Visual Studio 2005) -
I have a form with a background image (BackgroundImageLayout=Stretch).
The background image is an irregular shape and I am using the TransparencyKey to make the background outside the shape transparent.

I then have a custom control, derived from button.
I want the background of the button to be transparent, to show the background image of the form.

In this control, I override the PainBackground method where I have

     Rectangle parentRect = new Rectangle( this.Location.X, this.Location.Y,
                                    pe.ClipRectangle.Width, pe.ClipRectangle.Height );
     PaintEventArgs ppe = new PaintEventArgs( pe.Graphics, parentRect );
     this.InvokePaintBackground( this.Parent, ppe );

What happens is the rectangle of the button somehow captures the colors and shape of the form's background image, from the upper right corner of the form.  Since part of that is the transparency color, the button's background has a part that is transparent, showing whatever is on the desktop under the form, not the form's background image, as it should be doing.

Is this a bug in .NET or am I doing something wrong?  Is there a fix or workaround?

I can send you a complete solution to look at if you wish.  

  Thanks,
  Paul
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[+][-]12.27.2007 at 11:54AM PST, ID: 20536610

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[+][-]12.27.2007 at 12:57PM PST, ID: 20537108

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[+][-]12.27.2007 at 01:05PM PST, ID: 20537175

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[+][-]12.27.2007 at 01:16PM PST, ID: 20537241

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[+][-]12.27.2007 at 09:11PM PST, ID: 20539822

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[+][-]12.28.2007 at 04:56AM PST, ID: 20541362

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[+][-]12.28.2007 at 06:56AM PST, ID: 20542163

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[+][-]12.28.2007 at 07:36AM PST, ID: 20542510

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[+][-]12.28.2007 at 09:26AM PST, ID: 20543400

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[+][-]01.03.2008 at 03:06AM PST, ID: 20571917

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[+][-]01.03.2008 at 04:04AM PST, ID: 20572101

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About this solution

Zones: Microsoft Visual C#.Net, C# Programming Language, .NET Framework 2.x
Tags: form, background, button, custom, image
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Solution Provided By: kjetilroe
Participating Experts: 3
Solution Grade: A
 
 
[+][-]01.03.2008 at 06:17AM PST, ID: 20572937

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[+][-]01.03.2008 at 06:44AM PST, ID: 20573140

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