Windows Forms
A set of .NET Framework managed libraries for developing graphical user interfaces.
1,927 questions
With ACCENT_DISABLED instead of ACCENT_ENABLE_BLURBEHIND or other value
Test :
setWindowCompositionAttribute After setting transparency, how to restore
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(19.2, 57.99999999999999%, 11%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EX%3C/text%3E%3C/svg%3E)
XUWANBIN
201
Reputation points
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
Windows Forms
Accepted answer
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Castorix31 89,136 Reputation points2022-12-10T16:15:11.423+00:00 -
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.
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Castorix31 89,136 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?
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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...
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Castorix31 89,136 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...
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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 89,136 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)
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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
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Castorix31 89,136 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 89,136 Reputation points
2022-12-31T17:56:42.31+00:00 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
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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(227.2, 17%, 32%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ES%3C/text%3E%3C/svg%3E)
szx0427 101 Reputation points2025-02-02T14:08:51.36+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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