路由事件

路由事件的处理模型常用的有两种:

　　冒泡事件: 由子控件位次向父容器传递,大部分的路由事件都是冒泡事件

　　隧道事件: 由父容器位次向其子容器、控件传递，一般PreXXX事件属性隧道事件

下面提供键盘事件和鼠标事件

键盘的隧道事件

<Window x:Class="Event.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="KetEvent" Height="350" Width="480" WindowStartupLocation="CenterScreen" 
        Focusable="True" PreviewKeyDown="Window_PreviewKeyDown">
    <Canvas>        
        <!--..-->
        <TextBox x:Name="txtMessage" Margin="5" Width="300" Height="20" Canvas.Top="10" KeyDown="txtMessage_KeyDown"/>
        <TextBox x:Name="txtVolumeUp" Margin="5" Width="300" Height="20" Canvas.Top="40" KeyDown="txtVolumeUp_KeyDown"/>
        <TextBox x:Name="txtVolumeDown" Margin="5" Width="300" Height="20" Canvas.Top="70" KeyDown="txtVolumeDown_KeyDown"/>
    </Canvas>
</Window>

后台

/// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Window_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (e.Key == Key.Up)
            { 
                //按下"静音"键
                txtMessage.Text = "Up";
                e.Handled = true;
            }
            else if (e.Key == Key.Down)
            { 
                //按下"增大音量"键
                txtVolumeUp.Text = "Down";
                e.Handled = true;
            }
            else if (e.Key == Key.Left)
            { 
                //按下"减小音量"键
               txtVolumeDown.Text = "Left";
                e.Handled = true;
            }
        }

        private void txtMessage_KeyDown(object sender, KeyEventArgs e)
        {
            MessageBox.Show("Message");
        }

        private void txtVolumeUp_KeyDown(object sender, KeyEventArgs e)
        {
            MessageBox.Show("VolumeUp");
        }

        private void txtVolumeDown_KeyDown(object sender, KeyEventArgs e)
        {
            MessageBox.Show("VolumeDown");
        }

       
    }

在窗体上使用

PreviewKeyDown="Window_PreviewKeyDown"事件,事件前面使用PreView代表隧道事件下面。

KeyDown="txtMessage_KeyDown"事件,属于冒泡事件

鼠标的事件

<Window x:Class="MouseEvent.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="350" Width="525">
    
    <Canvas PreviewMouseDown="Canvas_PreviewMouseDown">
        <TextBox x:Name="txtMessage" Canvas.Left="50" Canvas.Top="46" Width="150" Height="20"/>
        <Rectangle Canvas.Left="246" Canvas.Top="46" Height="118" 
                   x:Name="mainRectangle" Stroke="Black" Width="200" Fill="White"
                   MouseEnter="mainRectangle_MouseEnter" MouseLeave="mainRectangle_MouseLeave"
                   MouseMove="mainRectangle_MouseMove" MouseDown="mainRectangle_MouseDown"
                   MouseWheel="mainRectangle_MouseWheel"/>    
    </Canvas>

</Window>

后台代码

  /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void mainRectangle_MouseEnter(object sender, MouseEventArgs e)
        {
            //鼠标进入控件时,控件的颜色为红色
            mainRectangle.Fill = new SolidColorBrush(Colors.Red);
        }

        private void mainRectangle_MouseLeave(object sender, MouseEventArgs e)
        {

            //鼠标离开控件时,控件的颜色为红色
            mainRectangle.Fill = new SolidColorBrush(Colors.White);
        }

        private void mainRectangle_MouseDown(object sender, MouseButtonEventArgs e)
        {
            //获取点击的鼠标的按钮
            MouseButton button = e.ChangedButton;
            txtMessage.Text += "
";
            txtMessage.Text += string.Format("Mouse Button is {0}", button.ToString());

        }

        private void mainRectangle_MouseMove(object sender, MouseEventArgs e)
        {
            //获取基于Rectangle的鼠标的坐标
            Point pointBaseRectange = Mouse.GetPosition(mainRectangle);
            txtMessage.Text = string.Format("Mouse Position (Base the Rectangle) is ({0},{1})", pointBaseRectange.X, pointBaseRectange.Y);
            txtMessage.Text += "
";

            //获取基于窗体的鼠标的坐标
            Point pointBaseWindow = Mouse.GetPosition(this);
            txtMessage.Text += string.Format("Mouse Position(Base thi Window) is ({0,1})", pointBaseWindow.X, pointBaseWindow.Y);

        }

        private void mainRectangle_MouseWheel(object sender, MouseWheelEventArgs e)
        {
            if (e.Delta > 0)
            { 
                //如果向上推动滚轮,图形的宽度增加
                mainRectangle.Width++;
            }

            if (e.Delta < 0)
            { 
                //如果向下推动滚轮,图形的宽度减小
                mainRectangle.Width--;
            }
        }
 
    }

在窗体上使用

PreviewMouseDown="Canvas_PreviewMouseDown"事件,事件前面使用PreView代表隧道事件下面。

MouseDown="mainRectangle_MouseDown"事件,属于冒泡事件