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HWND hwnd = CreateWindowEx( WS_EX_TOPMOST | WS_EX_LAYERED | WS_EX_TRANSPARENT | WS_EX_NOACTIVATE, className, L"CenteredWidget", WS_POPUP, 0, 0, 300, 200, NULL, NULL, hInstance, NULL ); SetLayeredWindowAttributes(hwnd, RGB(0,0,0), 180, LWA_ALPHA);
| Method | Implementation | Pros | Cons | |--------|----------------|------|------| | | Use SetWindowPos() or MoveWindow() in response to WM_DISPLAYCHANGE or timer events. | Precise control, low overhead. | Must handle DPI and taskbar offsets manually. | | WPF / UWP with transparent background | Set WindowStartupLocation="CenterScreen" and handle SizeChanged event. | Automatic scaling, modern XAML design. | UWP apps cannot draw over the desktop without restrictions. | | Electron / WebView2 | Use JavaScript to listen to resize events and reposition the frameless window. | Cross-platform, rich HTML/CSS UI. | Higher memory usage, not lightweight. |
HWND hwnd = CreateWindowEx( WS_EX_TOPMOST | WS_EX_LAYERED | WS_EX_TRANSPARENT | WS_EX_NOACTIVATE, className, L"CenteredWidget", WS_POPUP, 0, 0, 300, 200, NULL, NULL, hInstance, NULL ); SetLayeredWindowAttributes(hwnd, RGB(0,0,0), 180, LWA_ALPHA);
| Method | Implementation | Pros | Cons | |--------|----------------|------|------| | | Use SetWindowPos() or MoveWindow() in response to WM_DISPLAYCHANGE or timer events. | Precise control, low overhead. | Must handle DPI and taskbar offsets manually. | | WPF / UWP with transparent background | Set WindowStartupLocation="CenterScreen" and handle SizeChanged event. | Automatic scaling, modern XAML design. | UWP apps cannot draw over the desktop without restrictions. | | Electron / WebView2 | Use JavaScript to listen to resize events and reposition the frameless window. | Cross-platform, rich HTML/CSS UI. | Higher memory usage, not lightweight. |