diff --git a/src/Windows/Avalonia.Win32/WindowImpl.cs b/src/Windows/Avalonia.Win32/WindowImpl.cs index e2198015fe..6a6c2ffa9c 100644 --- a/src/Windows/Avalonia.Win32/WindowImpl.cs +++ b/src/Windows/Avalonia.Win32/WindowImpl.cs @@ -469,10 +469,14 @@ namespace Avalonia.Win32 { GetWindowRect(_hwnd, out var rc); - return new PixelPoint(rc.left, rc.top); + var border = HiddenBorderSize; + return new PixelPoint(rc.left + border.Width, rc.top + border.Height); } set { + var border = HiddenBorderSize; + value = new PixelPoint(value.X - border.Width, value.Y - border.Height); + SetWindowPos( Handle.Handle, IntPtr.Zero, @@ -486,6 +490,24 @@ namespace Avalonia.Win32 private bool HasFullDecorations => _windowProperties.Decorations == SystemDecorations.Full; + private PixelSize HiddenBorderSize + { + get + { + // Windows 10 and 11 add a 7 pixel invisible border on the left/right/bottom of windows for resizing + if (Win32Platform.WindowsVersion.Major < 10 || !HasFullDecorations) + { + return PixelSize.Empty; + } + + DwmGetWindowAttribute(_hwnd, (int)DwmWindowAttribute.DWMWA_EXTENDED_FRAME_BOUNDS, out var clientRect, Marshal.SizeOf(typeof(RECT))); + GetWindowRect(_hwnd, out var frameRect); + var borderWidth = GetSystemMetrics(SystemMetric.SM_CXBORDER); + + return new PixelSize(clientRect.left - frameRect.left - borderWidth, 0); + } + } + public void Move(PixelPoint point) => Position = point; public void SetMinMaxSize(Size minSize, Size maxSize)