在通知区域附近打开WPF窗口，支持多个监视器

本文关键字：支持 监视器 窗口 WPF 区域 通知 近打 | 更新日期: 2023-09-27 18:19:25

我的wpf应用程序应该在通知区域附近打开一个窗口。当用户点击托盘图标打开一个窗口。所以我需要在通知区域的同一屏幕上的窗口。现在我只是得到任务栏的位置:https://stackoverflow.com/a/8581546/1502011任务栏矩形在屏幕上https://stackoverflow.com/a/3677319/1502011然后我用它来定位我的窗口，像:

//xaml.cs
var taskBarLocation = GetTaskBarLocation();
var taskBarPosition = GetTaskbarPosition();
this.Left = taskBarLocation == Location.Left
            ? taskBarPosition.Width
            : SystemParameters.WorkArea.Width - Width;
this.Top = taskBarLocation == Location.Top
            ? taskBarPosition.Height
            : SystemParameters.WorkArea.Height - Height;

只有当通知区域放在主屏幕上时才有效。正如我所理解的，我应该使用WinApi将我的窗口放在其他监视器上，但我甚至不知道如何找到带有通知区域的屏幕。

在通知区域附近打开WPF窗口，支持多个监视器

Ok, since

1) Wpf窗口位置不关心显示器(它在"控制面板'所有控制面板项'显示'屏幕分辨率"坐标上工作，而不是在当前屏幕坐标上工作)

2) WinApi方法SHAppBarMessage(5, ref data)也适用于全局坐标

3)每个屏幕对象都有Bounds属性，表示屏幕在全局坐标处的位置

解决方法很简单:

public static class TaskBarLocationProvider
{
    // P/Invoke goo:
    private const int ABM_GETTASKBARPOS = 5;
    [DllImport("shell32.dll")]
    private static extern IntPtr SHAppBarMessage(int msg, ref AppBarData data);
    /// <summary>
    /// Where is task bar located (at top of the screen, at bottom (default), or at the one of sides)
    /// </summary>
    private enum Dock
    {
        Left = 0,
        Top = 1,
        Right = 2,
        Bottom = 3
    }
    private struct Rect
    {
        public int Left, Top, Right, Bottom;
    }
    private struct AppBarData
    {
        public int cbSize;
        public IntPtr hWnd;
        public int uCallbackMessage;
        public Dock Dock;
        public Rect rc;
        public IntPtr lParam;
    }
    private static Rectangle GetTaskBarCoordinates(Rect rc)
    {
        return new Rectangle(rc.Left, rc.Top,
            rc.Right - rc.Left, rc.Bottom - rc.Top);
    }
    private static AppBarData GetTaskBarLocation()
    {
        var data = new AppBarData();
        data.cbSize = Marshal.SizeOf(data);
        IntPtr retval = SHAppBarMessage(ABM_GETTASKBARPOS, ref data);
        if (retval == IntPtr.Zero)
        {
            throw new Win32Exception("WinAPi Error: does'nt work api method SHAppBarMessage");
        }
        return data;
    }
    private static Screen FindScreenWithTaskBar(Rectangle taskBarCoordinates)
    {
        foreach (var screen in Screen.AllScreens)
        {
            if (screen.Bounds.Contains(taskBarCoordinates))
            {
                return screen;
            }
        }
        return Screen.PrimaryScreen;
    }
    /// <summary>
    /// Calculate wpf window position for place it near to taskbar area
    /// </summary>
    /// <param name="windowWidth">target window height</param>
    /// <param name="windowHeight">target window width</param>
    /// <param name="left">Result left coordinate <see cref="System.Windows.Window.Left"/></param>
    /// <param name="top">Result top coordinate <see cref="System.Windows.Window.Top"/></param>
    public static void CalculateWindowPositionByTaskbar(double windowWidth, double windowHeight, out double left, out double top)
    {
        var taskBarLocation = GetTaskBarLocation();
        var taskBarRectangle = GetTaskBarCoordinates(taskBarLocation.rc);
        var screen = FindScreenWithTaskBar(taskBarRectangle);
        left = taskBarLocation.Dock == Dock.Left
            ? screen.Bounds.X + taskBarRectangle.Width
            : screen.Bounds.X + screen.WorkingArea.Width - windowWidth;
        top = taskBarLocation.Dock == Dock.Top
            ? screen.Bounds.Y + taskBarRectangle.Height
            : screen.Bounds.Y + screen.WorkingArea.Height - windowHeight;
    }

和在xaml.cs中的用法

    private void SetWindowPosition()
    {
        double left, right;
        TaskBarLocationProvider.CalculateWindowPositionByTaskbar(this.Width, this.Height, out left, out right);
        Left = left;
        Top = right;
    }
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