Dan Clark
96 lines
3.1 KiB
C#
96 lines
3.1 KiB
C#
using Microsoft.UI.Windowing;
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using Microsoft.UI.Xaml;
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using Windows.Win32;
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using Windows.Win32.Foundation;
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using WinRT.Interop;
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using Windows.Win32.Graphics.Gdi;
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using System.Drawing;
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using Windows.Win32.UI.Shell;
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using Windows.Win32.UI.WindowsAndMessaging;
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namespace Toolkit.UI.WinUI;
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public static partial class WindowExtensions
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{
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private static SUBCLASSPROC? SubClassDelegate;
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public static void SetBorderless(this Window window,
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bool value)
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{
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if (window.AppWindow is AppWindow appWindow &&
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appWindow.Presenter is OverlappedPresenter presenter)
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{
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presenter.IsMaximizable = !value;
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presenter.IsMinimizable = !value;
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presenter.IsResizable = !value;
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presenter.SetBorderAndTitleBar(!value, !value);
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}
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}
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public static void SetTransparency(this Window window,
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bool value)
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{
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nint handle = WindowNative.GetWindowHandle(window);
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if (handle == 0) return;
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HWND hWnd = new(handle);
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if (value)
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{
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EnableTransparency(hWnd);
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}
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else
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{
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DisableTransparency(hWnd);
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}
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}
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private static unsafe void EnableTransparency(HWND hWnd)
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{
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SubClassDelegate = new SUBCLASSPROC(WindowSubClass);
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_ = PInvoke.SetWindowSubclass(hWnd, SubClassDelegate, 0, 0);
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WINDOW_EX_STYLE exStyle = (WINDOW_EX_STYLE)PInvoke.GetWindowLong(hWnd, WINDOW_LONG_PTR_INDEX.GWL_EXSTYLE);
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_ = PInvoke.SetWindowLong(hWnd, WINDOW_LONG_PTR_INDEX.GWL_EXSTYLE,
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(int)(exStyle | WINDOW_EX_STYLE.WS_EX_LAYERED));
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COLORREF blackColor = new COLORREF((uint)ToWin32(Color.Black));
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_ = PInvoke.SetLayeredWindowAttributes(hWnd, blackColor, 0, LAYERED_WINDOW_ATTRIBUTES_FLAGS.LWA_COLORKEY |
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LAYERED_WINDOW_ATTRIBUTES_FLAGS.LWA_ALPHA);
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}
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private static unsafe void DisableTransparency(HWND hWnd)
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{
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if (SubClassDelegate != null)
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{
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_ = PInvoke.RemoveWindowSubclass(hWnd, SubClassDelegate, 0);
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SubClassDelegate = null;
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}
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WINDOW_EX_STYLE exStyle = (WINDOW_EX_STYLE)PInvoke.GetWindowLong(hWnd, WINDOW_LONG_PTR_INDEX.GWL_EXSTYLE);
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_ = PInvoke.SetWindowLong(hWnd, WINDOW_LONG_PTR_INDEX.GWL_EXSTYLE, (int)(exStyle & ~WINDOW_EX_STYLE.WS_EX_LAYERED));
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}
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private static int ToWin32(Color c) => c.B << 16 | c.G << 8 | c.R;
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private static unsafe LRESULT WindowSubClass(HWND hWnd,
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uint uMsg, WPARAM wParam, LPARAM lParam, nuint uIdSubclass, nuint dwRefData)
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{
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switch (uMsg)
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{
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case PInvoke.WM_ERASEBKGND:
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{
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RECT rect;
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PInvoke.GetClientRect(hWnd, &rect);
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HBRUSH hBrush = PInvoke.CreateSolidBrush(new COLORREF((uint)ToWin32(Color.Black)));
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_ = PInvoke.FillRect(new HDC((nint)wParam.Value),
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&rect, hBrush);
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_ = PInvoke.DeleteObject(new HGDIOBJ(hBrush));
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return new LRESULT(1);
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}
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}
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return PInvoke.DefSubclassProc(hWnd, uMsg, wParam, lParam);
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}
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} |