Make entire Picture Control Transparent

Question

1.00/5 (1 vote)

See more:

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

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

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

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.