WPF 使用 AppBar 将窗口停靠在桌面上，让其他程序不占用此窗口的空间（附我封装的附加属性）

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<Window x:Class="Walterlv.Demo.DesktopDocking.MainWindow" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:dock="clr-namespace:Walterlv.Demo.DesktopDocking" mc:Ignorable="d" Title="Walterlv 的停靠窗口" Height="450" Width="500" dock:DesktopAppBar.AppBar="Right"> <StackPanel Background="#ffcd42"> <TextBlock FontSize="64" Margin="64" TextAlignment="Center" Text="walterlv 的停靠窗口" /> <Button Content="再停靠一个 - blog.walterlv.com" FontSize="32" Padding="32" Margin="32" Background="#f9d77b" BorderThickness="0" Click="Button_Click"/> </StackPanel> </Window>

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using System; using System.Windows; namespace Walterlv.Demo.DesktopDocking { public partial class MainWindow : Window { public MainWindow() { InitializeComponent(); } protected override void OnSourceInitialized(EventArgs e) { base.OnSourceInitialized(e); DesktopAppBar.SetAppBar(this, AppBarEdge.Right); } } }

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DesktopAppBar.SetAppBar(this, AppBarEdge.None);

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using System; using System.ComponentModel; using System.Diagnostics.CodeAnalysis; using System.Runtime.InteropServices; using System.Threading.Tasks; using System.Windows; using System.Windows.Interop; // ReSharper disable IdentifierTypo // ReSharper disable InconsistentNaming // ReSharper disable EnumUnderlyingTypeIsInt // ReSharper disable MemberCanBePrivate.Local // ReSharper disable UnusedMember.Local // ReSharper disable UnusedMember.Global namespace Walterlv.Demo.DesktopDocking { /// <summary> /// 表示窗口停靠到桌面上时的边缘方向。 /// </summary> public enum AppBarEdge { /// <summary> /// 窗口停靠到桌面的左边。 /// </summary> Left = 0, /// <summary> /// 窗口停靠到桌面的顶部。 /// </summary> Top, /// <summary> /// 窗口停靠到桌面的右边。 /// </summary> Right, /// <summary> /// 窗口停靠到桌面的底部。 /// </summary> Bottom, /// <summary> /// 窗口不停靠到任何方向，而是成为一个普通窗口占用剩余的可用空间（工作区）。 /// </summary> None } /// <summary> /// 提供将窗口停靠到桌面某个方向的能力。 /// </summary> public class DesktopAppBar { /// <summary> /// 标识 Window.AppBar 的附加属性。 /// </summary> public static readonly DependencyProperty AppBarProperty = DependencyProperty.RegisterAttached( "AppBar", typeof(AppBarEdge), typeof(DesktopAppBar), new PropertyMetadata(AppBarEdge.None, OnAppBarEdgeChanged)); /// <summary> /// 获取 <paramref name="window"/> 当前的停靠边缘。 /// </summary> /// <param name="window">要获取停靠边缘的窗口。</param> /// <returns>停靠边缘。</returns> public static AppBarEdge GetAppBar(Window window) => (AppBarEdge)window.GetValue(AppBarProperty); /// <summary> /// 设置 <paramref name="window"/> 的停靠边缘方向。 /// </summary> /// <param name="window">要设置停靠的窗口。</param> /// <param name="value">要设置的停靠边缘方向。</param> public static void SetAppBar(Window window, AppBarEdge value) => window.SetValue(AppBarProperty, value); private static readonly DependencyProperty AppBarProcessorProperty = DependencyProperty.RegisterAttached( "AppBarProcessor", typeof(AppBarWindowProcessor), typeof(DesktopAppBar), new PropertyMetadata(null)); [SuppressMessage("ReSharper", "ConditionIsAlwaysTrueOrFalse")] private static void OnAppBarEdgeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) { if (DesignerProperties.GetIsInDesignMode(d)) { return; } var oldValue = (AppBarEdge) e.OldValue; var newValue = (AppBarEdge) e.NewValue; var oldEnabled = oldValue is AppBarEdge.Left || oldValue is AppBarEdge.Top || oldValue is AppBarEdge.Right || oldValue is AppBarEdge.Bottom; var newEnabled = newValue is AppBarEdge.Left || newValue is AppBarEdge.Top || newValue is AppBarEdge.Right || newValue is AppBarEdge.Bottom; if (oldEnabled && !newEnabled) { var processor = (AppBarWindowProcessor) d.GetValue(AppBarProcessorProperty); processor.Detach(); } else if (!oldEnabled && newEnabled) { var processor = new AppBarWindowProcessor((Window) d); d.SetValue(AppBarProcessorProperty, processor); processor.Attach(newValue); } else if (oldEnabled && newEnabled) { var processor = (AppBarWindowProcessor) d.GetValue(AppBarProcessorProperty); processor.Update(newValue); } } /// <summary> /// 包含对 <see cref="Window"/> 进行操作以便使其成为一个桌面停靠窗口的能力。 /// </summary> private class AppBarWindowProcessor { /// <summary> /// 创建 <see cref="AppBarWindowProcessor"/> 的新实例。 /// </summary> /// <param name="window">需要成为停靠窗口的 <see cref="Window"/> 的实例。</param> public AppBarWindowProcessor(Window window) { _window = window; _callbackId = RegisterWindowMessage("AppBarMessage"); _hwndSourceTask = new TaskCompletionSource<HwndSource>(); var source = (HwndSource) PresentationSource.FromVisual(window); if (source == null) { window.SourceInitialized = OnSourceInitialized; } else { _hwndSourceTask.SetResult(source); } _window.Closed = OnClosed; } private readonly Window _window; private readonly TaskCompletionSource<HwndSource> _hwndSourceTask; private readonly int _callbackId; private WindowStyle _restoreStyle; private Rect _restoreBounds; private ResizeMode _restoreResizeMode; private bool _restoreTopmost; private AppBarEdge Edge { get; set; } /// <summary> /// 在可以获取到窗口句柄的时候，给窗口句柄设置值。 /// </summary> private void OnSourceInitialized(object sender, EventArgs e) { _window.SourceInitialized -= OnSourceInitialized; var source = (HwndSource) PresentationSource.FromVisual(_window); _hwndSourceTask.SetResult(source); } /// <summary> /// 在窗口关闭之后，需要恢复窗口设置过的停靠属性。 /// </summary> private void OnClosed(object sender, EventArgs e) { _window.Closed -= OnClosed; _window.ClearValue(AppBarProperty); } /// <summary> /// 将窗口属性设置为停靠所需的属性。 /// </summary> private void ForceWindowProperties() { _window.WindowStyle = WindowStyle.None; _window.ResizeMode = ResizeMode.NoResize; _window.Topmost = true; } /// <summary> /// 备份窗口在成为停靠窗口之前的属性。 /// </summary> private void BackupWindowProperties() { _restoreStyle = _window.WindowStyle; _restoreBounds = _window.RestoreBounds; _restoreResizeMode = _window.ResizeMode; _restoreTopmost = _window.Topmost; } /// <summary> /// 使一个窗口开始成为桌面停靠窗口，并开始处理窗口停靠消息。 /// </summary> /// <param name="value">停靠方向。</param> public async void Attach(AppBarEdge value) { var hwndSource = await _hwndSourceTask.Task; BackupWindowProperties(); var data = new APPBARDATA(); data.cbSize = Marshal.SizeOf(data); data.hWnd = hwndSource.Handle; data.uCallbackMessage = _callbackId; SHAppBarMessage((int) ABMsg.ABM_NEW, ref data); hwndSource.AddHook(WndProc); Update(value); } /// <summary> /// 更新一个窗口的停靠方向。 /// </summary> /// <param name="value">停靠方向。</param> public async void Update(AppBarEdge value) { var hwndSource = await _hwndSourceTask.Task; Edge = value; var bounds = TransformToAppBar(hwndSource.Handle, _window.RestoreBounds, value); ForceWindowProperties(); Resize(_window, bounds); } /// <summary> /// 使一个窗口从桌面停靠窗口恢复成普通窗口。 /// </summary> public async void Detach() { var hwndSource = await _hwndSourceTask.Task; var data = new APPBARDATA(); data.cbSize = Marshal.SizeOf(data); data.hWnd = hwndSource.Handle; SHAppBarMessage((int) ABMsg.ABM_REMOVE, ref data); _window.WindowStyle = _restoreStyle; _window.ResizeMode = _restoreResizeMode; _window.Topmost = _restoreTopmost; Resize(_window, _restoreBounds); } private IntPtr WndProc(IntPtr hwnd, int msg, IntPtr wParam, IntPtr lParam, ref bool handled) { if (msg == _callbackId) { if (wParam.ToInt32() == (int) ABNotify.ABN_POSCHANGED) { var hwndSource = _hwndSourceTask.Task.Result; var bounds = TransformToAppBar(hwndSource.Handle, _window.RestoreBounds, Edge); Resize(_window, bounds); handled = true; } } return IntPtr.Zero; } private static void Resize(Window window, Rect bounds) { window.Left = bounds.Left; window.Top = bounds.Top; window.Width = bounds.Width; window.Height = bounds.Height; } private Rect TransformToAppBar(IntPtr hWnd, Rect area, AppBarEdge edge) { var data = new APPBARDATA(); data.cbSize = Marshal.SizeOf(data); data.hWnd = hWnd; data.uEdge = (int) edge; if (data.uEdge == (int) AppBarEdge.Left || data.uEdge == (int) AppBarEdge.Right) { data.rc.top = 0; data.rc.bottom = (int) SystemParameters.PrimaryScreenHeight; if (data.uEdge == (int) AppBarEdge.Left) { data.rc.left = 0; data.rc.right = (int) Math.Round(area.Width); } else { data.rc.right = (int) SystemParameters.PrimaryScreenWidth; data.rc.left = data.rc.right - (int) Math.Round(area.Width); } } else { data.rc.left = 0; data.rc.right = (int) SystemParameters.PrimaryScreenWidth; if (data.uEdge == (int) AppBarEdge.Top) { data.rc.top = 0; data.rc.bottom = (int) Math.Round(area.Height); } else { data.rc.bottom = (int) SystemParameters.PrimaryScreenHeight; data.rc.top = data.rc.bottom - (int) Math.Round(area.Height); } } SHAppBarMessage((int) ABMsg.ABM_QUERYPOS, ref data); SHAppBarMessage((int) ABMsg.ABM_SETPOS, ref data); return new Rect(data.rc.left, data.rc.top, data.rc.right - data.rc.left, data.rc.bottom - data.rc.top); } [StructLayout(LayoutKind.Sequential)] private struct RECT { public int left; public int top; public int right; public int bottom; } [StructLayout(LayoutKind.Sequential)] private struct APPBARDATA { public int cbSize; public IntPtr hWnd; public int uCallbackMessage; public int uEdge; public RECT rc; public readonly IntPtr lParam; } private enum ABMsg : int { ABM_NEW = 0, ABM_REMOVE, ABM_QUERYPOS, ABM_SETPOS, ABM_GETSTATE, ABM_GETTASKBARPOS, ABM_ACTIVATE, ABM_GETAUTOHIDEBAR, ABM_SETAUTOHIDEBAR, ABM_WINDOWPOSCHANGED, ABM_SETSTATE } private enum ABNotify : int { ABN_STATECHANGE = 0, ABN_POSCHANGED, ABN_FULLSCREENAPP, ABN_WINDOWARRANGE } [DllImport("SHELL32", CallingConvention = CallingConvention.StdCall)] private static extern uint SHAppBarMessage(int dwMessage, ref APPBARDATA pData); [DllImport("User32.dll", CharSet = CharSet.Auto)] private static extern int RegisterWindowMessage(string msg); } } }