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Transparent controls with custom image backgrounds on PocketPC

By , 15 Aug 2003
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Sample Image - transparent_controls.jpg

Introduction

I was writing a program on PPC 2002 and the program UI required a dialog with a bitmap image background. As I was designing the dialog in the eVC++ 3.0 dialog template editor, I added controls like static texts, group boxes and etc. I checked the transparent option in the property of each of the controls that I have added to the dialog. But on PPC 2002 the transparent option does not work like it does on PC Platform OSes. On CE, transparent windows behave as if they have WS_CLIPCHILDREN style set. You can see through the parent dialog window itself. Definately not the effect I was hoping for.

There is an article for making transparent static texts at http://www.pocketpcdn.com/ and http://www.pocketpcdn.com/articles/transparent_static.html.  It basically draws all of the static text in the WM_PAINT handler of the parent dialog procedure.  But if you have other controls such as group boxes, you will have to draw the group boxes yourself.

To solve this problem, I used the WM_CTLCOLORSTATIC message handler. I first created a pattern brush with the bitmap image to be used as the backround for the dialog window.  And in the WM_CTLCOLORSTATIC message handler in the dialog procedure, I returned the brush handle I created previously.  The downside to this method is that you'll have to create separate brushes for each of the controls that are to be transparent which means more memory usage.  But you get the desired effect.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

About the Author

Hyungchul Shin
Web Developer
Korea (Republic Of) Korea (Republic Of)
No Biography provided

Comments and Discussions

 
GeneralMy vote of 2 Pinmemberdadahacker19-Jun-09 18:15 
GeneralException when there are many, many objects Pinmemberacp92329-Mar-06 4:17 
When there are about 600 or so controls, each w/ its own CBrush, eventually a message box is displayed that states "Required Resource was" There is still a good amount of memory, but I seem to be running into a resource limit? Ideas?
 
thanks!
 
-- modified at 10:18 Wednesday 29th March, 2006
QuestionWhat if you have a dynamic bitmap background ? Pinmemberghostve28-Dec-04 3:29 
AnswerRe: What if you have a dynamic bitmap background ? PinsussAnonymous28-Dec-04 3:59 
GeneralThe WM_CTLCOLORSTATIC message handler and comboboxes. PinmemberDe Nys, FX11-Apr-04 10:47 
GeneralApply this sample only on the second DlgBox PinmemberGuilhemMtp31-Mar-04 5:25 
GeneralRe: Apply this sample only on the second DlgBox PinsussAnonymous14-Apr-04 2:33 
GeneralRe: Apply this sample only on the second DlgBox Pinmemberwqter25-Jun-04 0:12 
GeneralYou can have only one brush... PinmemberDic27-Oct-03 3:47 
GeneralRe: You can have only one brush... PinmemberJohann Gerell30-Oct-03 23:19 

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