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Posted 5 Aug 2006


, 11 Aug 2006
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This is a simple class that makes transparent dialog boxes rise more smoothly.

Sample Image - CGlassDialog.jpg


Before introducing this class, I want you to know my English is not very good. And, this is my first article. I've always got a lot of help from this site, so I really wanted to write an article and give back to the community.

Anyway, this is a simple class that makes transparent dialog boxes rise more smoothly. The reason why I made this is.. I've been making a program that has transparent windows. I thought if the windows could rise in more smoothly, it would be better visually. And I made up my mind to make this class.

How to make this??

It's so simple, I use an OnTimer() for the smooth rising.

First, you must declare this in your .h file:

#define WS_EX_LAYERED   0x00080000
#define LWA_COLORKEY    0x00000001
#define LWA_ALPHA       0x00000002
#define ULW_COLORKEY    0x00000001
#define ULW_ALPHA       0x00000002
#define ULW_OPAQUE      0x00000004


and then, you can use this code:

SLWA pSetLayeredWindowAttributes = NULL;  
HINSTANCE hmodUSER32 = LoadLibrary("USER32.DLL"); 
pSetLayeredWindowAttributes =(SLWA)GetProcAddress(hmodUSER32, 
SetWindowLong(m_hWnd, GWL_EXSTYLE, 
           GetWindowLong(m_hWnd, GWL_EXSTYLE) | WS_EX_LAYERED);
pSetLayeredWindowAttributes(m_hWnd, 0, (255 * m_nGlass) / 100, LWA_ALPHA);

In this code, m_nGlass is the rating of transparency so you can set this from 0 to 100. (If you set m_nGlass to 0, the dialog box will be perfectly transparent. If you set m_nGlass to 100, the dialog box will not be transparent at all.)

I've used this point. OnTimer() is the event function of WM_TIMER, so it makes executes the function in regular intervals.

in OnTimer(), you change the value of m_nGlass:

(m_nGlass >= 70) ? ReleaseTimer() : m_nGlass += m_nStepUnit; 

How to use this??

If you want to use this class, first, add GlassiDialog.h and GlassDialog.cpp into your project and #include GlassDialog.h where needed. Then, inherit the CGlassDialog class in your dialog class. (I.e., you should change the base class in your dialog from CDialog to CGlassDialog. Just go to your .cpp, .h files and use the "Replace" feature of your code editor to replace all CDialog with CGlassDialog.)

Now, that's all! Your dialog class is ready to go. When you create your dialog object, you will be able to see a smooth rising dialog box.

Thank you for reading my article!! :)


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


About the Author

Youngman Park
Software Developer
Korea (Republic of) Korea (Republic of)
No Biography provided

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Comments and Discussions

AnswerRe: Good Job: two more questions Pin
Youngman Park17-Aug-06 11:14
memberYoungman Park17-Aug-06 11:14 
GeneralRe: Good Job: two more questions Pin
GianniGP17-Aug-06 23:57
memberGianniGP17-Aug-06 23:57 
AnswerRe: Good Job: two more questions Pin
Youngman Park19-Aug-06 23:05
memberYoungman Park19-Aug-06 23:05 
GeneralRe: Good Job: two more questions Pin
GianniGP20-Aug-06 1:22
memberGianniGP20-Aug-06 1:22 
Thanks Youngman,

testing your sample, I finally discovered why tranparency won't work with CreateDialog(). Infact, in the dialog editor, changing the flag from WS_CHILD to WS_OVERLAPPED or WS_POPUP, I get transparency to work.
Well we do find the solution to the problem: there is no way to use tranparency when a window is WS_CHILD. These give me other problems, but anyway we figured out the problem.

Thanks for your cooperation.

Until next, take care.
GeneralRe: Good Job: two more questions Pin
Ant Htoo Naing2-Aug-07 17:44
memberAnt Htoo Naing2-Aug-07 17:44 
Generalsolution to initial flicker Pin
jnapier10-Aug-06 11:46
memberjnapier10-Aug-06 11:46 
GeneralRe: solution to initial flicker Pin
Youngman Park10-Aug-06 16:51
memberYoungman Park10-Aug-06 16:51 
Generalcool Pin
davidoff8-Aug-06 3:58
memberdavidoff8-Aug-06 3:58 
GeneralRe: cool Pin
Youngman Park8-Aug-06 4:07
memberYoungman Park8-Aug-06 4:07 
Generalcreative [modified] Pin
pb967-Aug-06 22:11
memberpb967-Aug-06 22:11 

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