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Transparent CSliderCtrl Class

, 14 Nov 2002 CPOL
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A MFC Transparent CSliderCtrl class

sliders.jpg

Introduction

This is a MFC transparent slider class. As it uses CSliderCtrl as its base class it can be used as a replacement class for any CSliderCtrl object. Tic marks are fully supported as can be seen in the screen shot above. To use, add this class to your project. Add your sliders to your project normally, then change the CSliderCtrl type in your .h file to CMySliderControl and #include the MySliderControl.h file. Once compiled your sliders will be transparent and if you have auto tics set then these too will show.

Update

V2.0 Re-wrote parts of the class. Added the ability to redraw the controls when the backgrounds had changed. Added custom transparent channel and custom thumb with optional colours. The demo source has been updated to show the background changing.

License

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

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About the Author

Nic Wilson
Web Developer
Australia Australia
No Biography provided

Comments and Discussions

 
GeneralRe: DrawTransparent() question PinmemberDavid Cole30-Jul-04 8:00 
AnswerRe: DrawTransparent() question Pinmemberdhclark3-Nov-10 9:11 
QuestionBetter way to know vertical from horizontal? PinmemberHarold Bamford20-Nov-02 18:27 
AnswerRe: Better way to know vertical from horizontal? PinmemberNic Wilson21-Nov-02 12:18 
Harold Bamford wrote:
In your code for DrawChannel(), you ask if there is a better way to determine if the control is vertical or horizontal. Try:
 
Great! I could not find that anywhere I will give it a try!
 
Harold Bamford wrote:
It looks like the goal of DrawChannel() is merely to capture the background bitmap and then finish the channel. Wouldn't it be easier to just capture the background in OnCustomDraw() and set *pResult = CDRF_DODEFAULT;
 
The class is unfinished and this is skeleton code for those who wish to alter the channel, some users do not know how to do this. I also like the type of channel this draws, I have expanded it further to fill the channel with various colours to the left, right or both sides of the slider sort of like a progress bar built in.
I will upload changes soon.
 

Harold Bamford wrote:
And while I'm asking dumb questions, why do you use the DC for the parent window rather than the current window?
 
The parent DC holds the background image we use to make the control transparent.
 
Nic

GeneralChanging the background image PinmemberAtlantys22-Sep-02 8:51 

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