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WPF冒泡事件和隧道事件

2024-08-04 10:01:55   224人阅读

 

冒泡事件: MouseMove, 触发控件事件的顺序:从上层到底层

隧道事件: PreviewMouseMove,触发控件事件的顺序:从底层到上层

 

冒泡事件: MouseMove

<Border x:Name="greenBorder" Background="Green" Width="300" HorizontalAlignment="Right" MouseMove="greenBorder_MouseMove">
      <Border x:Name="redBorder" Background="Red" Width="120" Height="120" MouseMove="redBorder_MouseMove"></Border>
</Border>

后台代码:

        private void LowerBorder_MouseMove(object sender, MouseEventArgs e)        {            if (e.LeftButton == MouseButtonState.Pressed)            {                text1.Text += "Lower Border x:" + e.GetPosition(this).X + "     y:" + e.GetPosition(this).Y + "\r\n";            }        }        private void TopBorder_MouseMove(object sender, MouseEventArgs e)        {            if (e.LeftButton == MouseButtonState.Pressed)            {                text1.Text += "Top Border x:" + e.GetPosition(this).X + "     y:" + e.GetPosition(this).Y + "\r\n";                //设置Handled=true, 阻止执行LowerBorder_MouseMove事件                e.Handled = true;            }        }
View Code

 

 

隧道事件:PreviewMouseMove

<Border x:Name="LowerBorder" Background="Green" Width="300" HorizontalAlignment="Right" PreviewMouseMove="LowerBorder_PreviewMouseMove">
      <Border x:Name="TopBorder" Background="Red" Width="120" Height="120" PreviewMouseMove="TopBorder_PreviewMouseMove"></Border>
</Border>

//先执行LowerBorder事件        private void LowerBorder_PreviewMouseMove(object sender, MouseEventArgs e)        {            if (e.LeftButton == MouseButtonState.Pressed)            {                text1.Text += "Lower Border x:" + e.GetPosition(this).X + "     y:" + e.GetPosition(this).Y + "\r\n";            }        }        //后执行TopBorder事件        private void TopBorder_PreviewMouseMove(object sender, MouseEventArgs e)        {            if (e.LeftButton == MouseButtonState.Pressed)            {                text1.Text += "Top Border x:" + e.GetPosition(this).X + "     y:" + e.GetPosition(this).Y + "\r\n";            }        }
View Code

 

WPF冒泡事件和隧道事件


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