WPF 路由事件

最新推荐文章于 2025-03-26 14:40:11 发布

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本文详细介绍了WPF中路由事件的实现方式，包括事件的定义、注册、触发及处理过程，并探讨了不同路由策略的应用场景。

1、事件的本质是委托处理
2、实例创建

1）、路由事件定义+注册

 public static readonly RoutedEvent CustomClickEvent = EventManager.RegisterRoutedEvent("CustomClick", RoutingStrategy.Direct, typeof(RoutedEventHandler), typeof(CustomizedButton));

2）、属性包装（add+remove）

public event RoutedEventHandler CustomClick
{
            add { AddHandler(CustomClickEvent, value); }
            remove { RemoveHandler(CustomClickEvent, value); }
}

3）、事件触发

void RaiseCustomClick()
        {
            RoutedEventArgs routedEventArgs = new RoutedEventArgs(CustomizedButton.CustomClickEvent);
            RaiseEvent(routedEventArgs);
        }

4）、重写事件的方法

 protected override void OnClick()
        {
            RaiseCustomClick();
        }

5）、界面

<Window x:Class="CustimizedRouteEvent.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:custom="clr-namespace:CustimizedRouteEvent"
        mc:Ignorable="d" Loaded="Window_Loaded"
        custom:CustomizedButton.CustomClick ="Window_CustomClick"
        Title="MainWindow" Height="450" Width="800">
    <Grid  Name="MyGrid" custom:CustomizedButton.CustomClick ="Grid_CustomClick">
        <custom:CustomizedButton CustomClick="CustomizedButton_CustomClick" x:Name="customButton" Background="Green" >
            <Button Name="InnerButton" Background="Beige" Width="300" Height="200" Click="InnerButton_Click"/>
        </custom:CustomizedButton >
    </Grid>
</Window>

6）、类事件处理函数

public class CustomizedButton : Button
{
        static CustomizedButton()
        {
            //即使已经处理也再处理，最后一个参数TRUE，为已有路由事件添加新的委托处理
            EventManager.RegisterClassHandler(typeof(CustomizedButton), CustomClickEvent, new RoutedEventHandler(CustomClickClassHandler), true);
        }
         /// <summary>
        /// 一般CLR事件处理
        /// </summary>
        public event EventHandler ClassEventHandler;

        public static void CustomClickClassHandler(object sender, RoutedEventArgs e)
        {
            CustomizedButton customizedButton = sender as CustomizedButton;
            EventArgs eventArgs = new EventArgs();
            customizedButton.ClassEventHandler(CustomizedButton.ClickEvent, eventArgs);
        }
}

public MainWindow()
{
   InitializeComponent();
   this.customButton.ClassEventHandler += new EventHandler(ClassEventHandler);

}

 private void ClassEventHandler(object sender, EventArgs e)
{
   Console.WriteLine("ClassEventHandler" + "//" + e.ToString() + "//" + sender.ToString());
}

3、路由政策

1）、Bubble：上浮（冒泡）从源到根，eg. Button——>Grid——>Window (Handled不处理)
2）、Tunnel：下沉（隧道）从根到源， eg. Window——>Grid——>Button (Handled不处理)

3）、Direct ：Button