setWindowCompositionAttribute After setting transparency, how to restore

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setWindowCompositionAttribute After setting transparency, how to restore

XUWANBIN 201

When I use setWindowCompositionAttribute to set a window to be transparent, what is the correct way to restore the window to its original state when I can not make the window transparent

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Answer 1

Castorix31 91,871

With ACCENT_DISABLED instead of ACCENT_ENABLE_BLURBEHIND or other value
Test :

XUWANBIN 201 Reputation points

2022-12-11T03:52:56.583+00:00

When I set "ACCENT_DISABLED",the window will be black. In fact,the window had a little transparency before I change it.
Castorix31 91,871 Reputation points

2022-12-11T08:21:44.517+00:00

How did you set this "little transparency" ?
On my OS (Windows 10 21H1), ACCENT_DISABLED resets to the normal style (no more transparency)
XUWANBIN 201 Reputation points

2022-12-28T13:20:54.583+00:00

Hello, does the background have to be black? Can I specify the color?
XUWANBIN 201 Reputation points

2022-12-28T13:23:00.373+00:00

I used this function on the taskbar in Windows 11, the blur effect was there, but I couldn't restore the original color of the taskbar...
Castorix31 91,871 Reputation points

2022-12-29T17:15:24.507+00:00
I don't have Windows 11, but on Windows 10, I can refresh the Taskbar with this C++ code (easy to translate in C# or VB) :
(remove space at S leep)

HWND hWndTaskbar = FindWindow(TEXT("Shell_TrayWnd"), NULL); SendMessage(hWndTaskbar, 1482, 4, 1); S leep(100); SendMessage(hWndTaskbar, 1482, 4, 0);

But maybe it won't work on Windows 11...
XUWANBIN 201 Reputation points

2022-12-30T04:20:48.53+00:00

The effect on Windows 11 is
1 Automatically hide the taskbar
0 Disable auto hiding
This effect is not very good. Is there any other way?
By the way, setWindowCompositionAttribute () background must be black to transparent? For example, if I want to make the background green, can I make the green transparent?
Castorix31 91,871 Reputation points

2022-12-30T09:14:44.26+00:00

On my Windows 10, the Taskbar is also refreshed when I change some parameters like
EnableTransparency
at
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Themes\Personalize

(if it is 0, I can set it to 1, then back to 0, or the reverse)
XUWANBIN 201 Reputation points

2022-12-30T13:30:38.623+00:00

I changed everything inside. Changing the transparency will turn it into a solid color, but it will not refresh the background
Castorix31 91,871 Reputation points

2022-12-30T17:55:44.243+00:00

But updating EnableTransparency does nothing ?
On my Windows 10 (22H2 now), even by updating the value manually with Regedit restores the original color of the Taskbar (I have set it to Accent color in Settings) after I set it transparent and set ACCENT_DISABLED (which sets it black)
XUWANBIN 201 Reputation points

2022-12-31T16:53:36.433+00:00

When I changed the registry to 0, the taskbar did become an accent color.
When I restore the registry to 1, the taskbar does turn black.
But when I click the Start menu button, the taskbar will refresh and revert to acrylic.
If you use the WIN key to restore taskbar acrylic, this is not a good choice for the user.

Castorix31 91,871

It works fine for me by code on Windows 10 :

				// Call SetWindowCompositionAttribute with ACCENT_ENABLE_BLURBEHIND => Background = transparent  
				// ...  
				// Reset Taskbar :  
				// Call SetWindowCompositionAttribute with ACCENT_DISABLED => Background = Black  
				// Then to reset original color (Accent color) :  
				HKEY hKey;  
				DWORD dwSize;  
				LONG nResult;  
				if (RegOpenKeyEx(HKEY_CURRENT_USER, TEXT("SOFTWARE\\Microsoft\\Windows\\CurrentVersion\\Themes\\Personalize"), 0, KEY_READ | KEY_WRITE, &hKey) == ERROR_SUCCESS)  
				{	  
					DWORD nTransparencyOrig = 0;  
					dwSize = sizeof(nTransparencyOrig);  
					nResult = RegQueryValueEx(hKey, TEXT("EnableTransparency"), 0, NULL, (LPBYTE)&nTransparencyOrig, (LPDWORD)&dwSize);  
					if (nResult == ERROR_SUCCESS)  
					{  
						DWORD nTransparency = (nTransparencyOrig == 0)?1:0;  
						nResult = RegSetValueEx(hKey, TEXT("EnableTransparency"), 0, REG_DWORD, (LPBYTE)&nTransparency, sizeof(nTransparency));							  
						//SendNotifyMessage(HWND_BROADCAST, WM_SETTINGCHANGE, 0, (LPARAM)"ImmersiveColorSet");  
						RegSetValueEx(hKey, TEXT("EnableTransparency"), 0, REG_DWORD, (LPBYTE)&nTransparency, sizeof(nTransparency));  
						//SendNotifyMessage(HWND_BROADCAST, WM_SETTINGCHANGE, 0, (LPARAM)"ImmersiveColorSet");  
						RegCloseKey(hKey);  
					}  
				}

XUWANBIN 201 Reputation points

2022-12-31T18:26:55.407+00:00

Is there no method for win11? Well, thank you
szx0427 101 Reputation points

2025-02-02T14:08:51.36+00:00

Could u tell me how u kept the text on button pure black while the main window is blurred? When I call SetWindowCompositionAttribute to blur the main window, the text of the controls on it become transparent too and thus hard to read. If u cannot remember the details, would u mind just copy your program's code here or attach it to your reply? This will be of great help. Thank you.

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setWindowCompositionAttribute After setting transparency, how to restore

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