Make entire Picture Control Transparent

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Hi All,

I am trying the below scenario since a long time but unable to succeed.
Inputs: Dialog box with 2 Picture controls, mfcbutton, slider control and few buttons.

1. I need to add a jpg image as complete background of my dialog box.
Solution: I have achieved this by using CImagePreviewStatic.
Below is the link:
https://www.google.co.in/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&ved=0CCMQFjABahUKEwiehpHWmYXGAhULq7wKHeNQABo&url=http%3A%2F%2Fwww.codeproject.com%2FArticles%2F6354%2FA-simple-image-preview-class-using-GDI&ei=XDd4VZ7oMovW8gXjoYHQAQ&usg=AFQjCNEcO0kiW8Ie-voNfaGMIDB2P3D0Ig&bvm=bv.95039771,d.dGc&cad=rja[^]
This is working fine for me.

2. 2nd picture control is positioned centered on top of 1st- I have an Bitmap attached or I draw a graph like temperature measurement etc using OnPaint() with SolidBrush to draw polylines etc.

Based on the Slider control input, I now want to make this 2nd picture control transparent in a way that it fades to some maximum value.
Also, the mfcbutton that I mentioned is having a bitmap added, even its transparency should change with respect to slider control value.

I am using Visual Studio 2010 and MFC C++ only.

Please let me know if you are aware of any solutions.
Thank you in advance.

Posted 10-Jun-15 3:16am

Member 11294403

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Member 11294403 · Answer 1 · 2015-06-10T05:00:00

Finally, its my pleasure to post this answer.
Layered Windows as worked just so amazing for me.

This is resolved.

I have used:

C#

// Make this window 70% alpha
SetLayeredWindowAttributes(hwnd, 0, (255 * 70) / 100, LWA_ALPHA);

If I want the remaining area on the dialog to be made transparent, I will just add the RGB color and in last parameter LWA_ALPHA | LWA_COLORKEY

I have added this on VScroll event of the Slider Control. So that the alpha percentage can be controlled by the position of the slider control.

Make entire Picture Control Transparent

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Make entire Picture Control Transparent

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