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Add WindowManager #132 
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‎dev/DevWinUI/Common/Window/WindowManager.cs‎

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using static DevWinUI.NativeValues;
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namespace DevWinUI;
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public partial class WindowManager : IDisposable
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{
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private readonly Window _window;
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private readonly WindowMessageMonitor _monitor;
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public double Width
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{
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get => _window.AppWindow.Size.Width / (WindowHelper.GetDpiForWindow(_window) / 96d);
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set => WindowHelper.SetWindowSize(_window, value, Height);
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}
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public double Height
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{
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get => _window.AppWindow.Size.Height / (WindowHelper.GetDpiForWindow(_window) / 96d);
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set => WindowHelper.SetWindowSize(_window, Width, value);
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}
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private double _minWidth = 136;
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public double MinWidth
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{
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get => _minWidth;
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set
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{
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_minWidth = value;
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if (Width < value)
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Width = value;
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}
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}
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private double _minHeight = 39;
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public double MinHeight
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{
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get => _minHeight;
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set
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{
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_minHeight = value;
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if (Height < value)
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Height = value;
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}
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}
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private double _maxWidth = 0;
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public double MaxWidth
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{
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get => _maxWidth;
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set
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{
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if (value < 0) throw new ArgumentOutOfRangeException(nameof(value));
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_maxWidth = value;
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if (value > 0 && Width > value)
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Width = value;
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}
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}
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private double _maxHeight = 0;
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public double MaxHeight
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{
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get => _maxHeight;
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set
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{
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if (value < 0) throw new ArgumentOutOfRangeException(nameof(value));
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_maxHeight = value;
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if (value > 0 && Height > value)
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Height = value;
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}
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}
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public WindowManager(Window window)
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{
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_window = window;
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_monitor = new WindowMessageMonitor(_window);
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_monitor.WindowMessageReceived -= OnWindowMessageReceived;
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_monitor.WindowMessageReceived += OnWindowMessageReceived;
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}
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private unsafe void OnWindowMessageReceived(object sender, WindowMessageEventArgs e)
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{
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if (e.MessageType == (uint)NativeValues.WindowMessage.WM_GETMINMAXINFO)
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{
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MINMAXINFO* rect2 = (MINMAXINFO*)e.Message.LParam;
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var currentDpi = WindowHelper.GetDpiForWindow(_window);
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// Restrict min-size
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rect2->ptMinTrackSize.X = (int)(Math.Max(MinWidth * (currentDpi / 96f), rect2->ptMinTrackSize.X));
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rect2->ptMinTrackSize.Y = (int)(Math.Max(MinHeight * (currentDpi / 96f), rect2->ptMinTrackSize.Y));
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// Restrict max-size
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if (!double.IsNaN(MaxWidth) && MaxWidth > 0)
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rect2->ptMaxTrackSize.X = (int)(Math.Min(Math.Max(MaxWidth, MinWidth) * (currentDpi / 96f), rect2->ptMaxTrackSize.X));
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if (!double.IsNaN(MaxHeight) && MaxHeight > 0)
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rect2->ptMaxTrackSize.Y = (int)(Math.Min(Math.Max(MaxHeight, MinHeight) * (currentDpi / 96f), rect2->ptMaxTrackSize.Y));
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}
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}
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public void Dispose()
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{
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_monitor.WindowMessageReceived -= OnWindowMessageReceived;
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_monitor.Dispose();
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}
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}

‎dev/DevWinUI/Helpers/WindowHelper/WindowHelper.cs‎

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@@ -649,4 +649,10 @@ public static void SetRegion(Microsoft.UI.Xaml.Window window, ScreenRegion? regi
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PInvoke.DeleteObject(rgn);
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}
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}
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public static void SetWindowSize(Microsoft.UI.Xaml.Window window, double width, double height)
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{
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var scale = WindowHelper.GetDpiForWindow(WindowNative.GetWindowHandle(window)) / 96f;
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window.AppWindow.Resize(new Windows.Graphics.SizeInt32((int)(width * scale), (int)(height * scale)));
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}
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}

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