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第三章-路由事件

news 2026/5/25 8:17:50

路由事件：冒泡事件（从自己开始）、隧道时间（预览事件preview开头,从根开始开始）、直接事件

事件的分类：
作用：生命周期时间
输入事件
手写笔事件
触控事件

一、冒泡事件

    <Grid><StackPanel MouseLeftButtonDown="StackPanel_MouseLeftButtonDown"><Border Background="Red" Margin="30"Width="130" Height="130" MouseLeftButtonDown="Border_MouseLeftButtonDown"></Border></StackPanel></Grid>

    private void Border_MouseLeftButtonDown(object sender, MouseButtonEventArgs e){MessageBox.Show("Boder");e.Handled = true;//拦截，不让事件继续往上抛
    }private void StackPanel_MouseLeftButtonDown(object sender, MouseButtonEventArgs e){MessageBox.Show("Stack");}

　　点击Border后，先弹出"Border"对话框后又弹出"Stack"对话框

　　点击StackPanel后，弹出"Stack"对话框

二、隧道事件

 <Grid><StackPanel PreviewMouseDown="StackPanel_PreviewMouseDown"><Border Background="Red" Margin="30"Width="130" Height="130" PreviewMouseDown="Border_PreviewMouseDown"></Border></StackPanel></Grid>

  private void StackPanel_PreviewMouseDown(object sender, MouseButtonEventArgs e){MessageBox.Show("StackPanel");e.Handled = true;//拦截}private void Border_PreviewMouseDown(object sender, MouseButtonEventArgs e){MessageBox.Show("Boder");}

　　点击StackPanel后，先弹出"Stack"对话框后又弹出"Border"对话框

　　点击Border后，弹出"Border"对话框

三、鼠标事件

    <!--鼠标移动时，显示鼠标窗体当前坐标--><!--鼠标按下时显示坐标，放开则不显示--><Grid x:Name="grid" MouseMove="Grid_MouseMove"MouseDown="grid_MouseDown"MouseUp="grid_MouseUp"><TextBlock x:Name="txtPoint" Foreground="Black"></TextBlock></Grid>

可在鼠标按下时加入鼠标捕获功能Mouse.Capture((UIElement(sender))) 释放时可释放捕捉Mouse.Capture(null)

      private bool IsShowPoint = false;//鼠标按下事件private void Grid_MouseMove(object sender, MouseEventArgs e){if (IsShowPoint){Point point = e.GetPosition(grid);txtPoint.Text = $"当前坐标为({point.X},{point.Y})";}}//鼠标按下事件private void grid_MouseDown(object sender, MouseButtonEventArgs e){IsShowPoint = true;}//鼠标释放事件private void grid_MouseUp(object sender, MouseButtonEventArgs e){IsShowPoint = false;}