C# WPF QQ新消息托盘悬浮窗效果实现

<Window x:Class="qqnotifybar.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:local="clr-namespace:qqnotifybar"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Popup Name="NotifyBar" AllowsTransparency="True" Placement="Absolute">
            <Grid Name="NotifyBar_Grid" Width="285" Height="126" Background="Red">
                <!--为了能更清晰地看到托盘图标是否在弹框的中间位置加一个Grid-->
                <Grid Background="Yellow" Width="5" Height="126" HorizontalAlignment="Center"></Grid>
            </Grid>
        </Popup>
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Forms;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Threading;

namespace qqnotifybar
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {

        //winform托盘图标组件
        NotifyIcon notifyicon;

        //计时器
        DispatcherTimer notifybar_timer;

        //鼠标是否在通知栏内变量
        bool NotifyBar_IsMouseEnter = false;

        public MainWindow()
        {

            InitializeComponent();

            //初始化托盘图标
            notifyicon = new NotifyIcon();
            notifyicon.Icon = System.Drawing.Icon.ExtractAssociatedIcon(System.Windows.Forms.Application.ExecutablePath);
            notifyicon.Text = "Dove";
            notifyicon.Visible = true;
            notifyicon.MouseMove += notifyicon_mousemove;
   
            //初始化计时器
            notifybar_timer = new DispatcherTimer();
            notifybar_timer.Interval = TimeSpan.FromSeconds(1);
            notifybar_timer.Tick += notifybar_timer_tick;

            //给弹框中的grid加上鼠标移入移出事件
            NotifyBar_Grid.MouseEnter += NotifyBar_MouseEnter;
            NotifyBar_Grid.MouseLeave += NotifyBar_MouseLeave;

        }

        #region win32api

        #region 获取鼠标指针相对于屏幕的坐标
        [StructLayout(LayoutKind.Sequential)]
        public struct POINT
        {
            public int x;
            public int y;

            public POINT(int x, int y)
            {
                this.x = x;
                this.y = y;
            }
        }

        [DllImport("user32.dll", CharSet = CharSet.Auto)]
        public static extern bool GetCursorPos(out POINT pt);
        #endregion

        #region 获取托盘图标的位置
        //代码来自于：http://blog.csdn.net/haoqi9999/article/details/76527981?locationNum=6&fps=1
        public class RG
        {
            public int Left { get; set; }
            public int Top { get; set; }
            public int Widht { get; set; }
            public int Height { get; set; }

            public RG(int left, int top, int widht, int height)
            {
                Left = left;
                Top = top;
                Widht = widht;
                Height = height;
            }
            public override string ToString()
            {
                return "Left:" + Left + ",Top:" + Top + ",Width:" + Widht + ",Height:" + Height;
            }
        }
        public static RG GetIconRect(NotifyIcon icon)
        {
            RECT rect = new RECT();
            NOTIFYICONIDENTIFIER notifyIcon = new NOTIFYICONIDENTIFIER();

            notifyIcon.cbSize = Marshal.SizeOf(notifyIcon);
            //use hWnd and id of NotifyIcon instead of guid is needed
            notifyIcon.hWnd = GetHandle(icon);
            notifyIcon.uID = GetId(icon);

            int hresult = Shell_NotifyIconGetRect(ref notifyIcon, out rect);
            //rect now has the position and size of icon

            return new RG(rect.left, rect.top, rect.right - rect.left, rect.bottom - rect.top);
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct RECT
        {
            public Int32 left;
            public Int32 top;
            public Int32 right;
            public Int32 bottom;
        }

        [StructLayout(LayoutKind.Sequential)]
        private struct NOTIFYICONIDENTIFIER
        {
            public Int32 cbSize;
            public IntPtr hWnd;
            public Int32 uID;
            public Guid guidItem;
        }

        [DllImport("shell32.dll", SetLastError = true)]
        private static extern int Shell_NotifyIconGetRect([In]ref NOTIFYICONIDENTIFIER identifier, [Out]out RECT iconLocation);

        private static FieldInfo windowField = typeof(NotifyIcon).GetField("window", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
        private static IntPtr GetHandle(NotifyIcon icon)
        {
            if (windowField == null) throw new InvalidOperationException("[Useful error message]");
            NativeWindow window = windowField.GetValue(icon) as NativeWindow;

            if (window == null) throw new InvalidOperationException("[Useful error message]");  // should not happen?
            return window.Handle;
        }

        private static FieldInfo idField = typeof(NotifyIcon).GetField("id", System.Reflection.BindingFlags.NonPublic | System.Reflection.BindingFlags.Instance);
        private static int GetId(NotifyIcon icon)
        {
            if (idField == null) throw new InvalidOperationException("[Useful error message]");
            return (int)idField.GetValue(icon);
        }
        #endregion

        #endregion

        #region 操作通知栏
        //定时器方法
        private void notifybar_timer_tick(object sender, EventArgs e)
        {
            POINT pt = new POINT();

            //获取鼠标的位置
            GetCursorPos(out pt);

            //获取托盘图标的位置
            RG rg = GetIconRect(notifyicon);

            if (pt.x > rg.Left && pt.x < (rg.Left + rg.Widht) && pt.y > rg.Top && pt.y < (rg.Top + rg.Height))
            {
                //鼠标指针还在托盘图标中，不需要处理              
            }
            else
            {
                //鼠标移除托盘图标区域

                //停止计时器
                notifybar_timer.Stop();

                //判断指针是否移入了弹框popup的区域
                if (NotifyBar_IsMouseEnter == false)
                {
                    //不是则关闭popup
                    NotifyBar.IsOpen = false;
                }
              
            }
        }

        //托盘图标鼠标移入
        private void notifyicon_mousemove(object sender, System.Windows.Forms.MouseEventArgs e)
        {
            //鼠标移入托盘图标后显示弹框
            NotifyBar.IsOpen = true;

            //如果计时器没有启动则启动
            if (notifybar_timer.IsEnabled == false)
            {
                notifybar_timer.Start();
            }

            //获取托盘图标位置
            RG rg = GetIconRect(notifyicon);

            //计算弹框的位置，使其在托盘图标的正上方中间的位置
            //弹框（popup）距离屏幕上方的位置 = 托盘距离屏幕上方位置 - 弹框的实际高度
            NotifyBar.VerticalOffset = rg.Top - NotifyBar_Grid.ActualHeight;
            //这里计算使弹框在托盘图标中间的位置
            NotifyBar.HorizontalOffset = rg.Left - (NotifyBar_Grid.ActualWidth / 2) + (rg.Widht / 2);
           
            
        }



        
        private void NotifyBar_MouseEnter(object sender, System.Windows.Input.MouseEventArgs e)
        {
            //鼠标移入弹框GRID区域了

            NotifyBar_IsMouseEnter = true;
        }

        private void NotifyBar_MouseLeave(object sender, System.Windows.Input.MouseEventArgs e)
        {
            //鼠标离开了弹框的GRID区域

            //判断鼠标是否曾经移入到弹框GRID区域中过
            if (NotifyBar_IsMouseEnter)
            {
                //是，关闭。
                
                NotifyBar.IsOpen = false;
            }

            //重置鼠标是否移入弹框GRID区域变量值
            NotifyBar_IsMouseEnter = false;
        }
        #endregion

    }

}