C# Avalonia 05 - RoutedEvents- BubbledLabelClick

冒泡事件

RoutedEventArgs扩展

 //RoutedEventArgs扩展
 public static object? OriginalSource(this RoutedEventArgs e)
 {
     return (Application.Current?.ApplicationLifetime as IClassicDesktopStyleApplicationLifetime)?.MainWindow;
 }

BubbledLabelClick.axaml代码

<Window xmlns="https://github.com/avaloniaui"
        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"
        Height="359" Width="329"
        x:Class="AvaloniaUI.BubbledLabelClick"
        Title="BubbledLabelClick">
    <Grid Margin="3" PointerReleased="SomethingClicked" RowDefinitions="auto,*,auto,auto">
        <Label Margin="5" Background="AliceBlue" BorderBrush="Black" BorderThickness="1" PointerReleased="SomethingClicked" HorizontalAlignment="Left" >
            <StackPanel PointerReleased="SomethingClicked" >
                <TextBlock Margin="3" PointerReleased="SomethingClicked" >
                    Image and picture label
                </TextBlock>
                <Image Source="avares://AvaloniaUI/Resources/Images/happyface.jpg" Stretch="None"
                       PointerReleased="SomethingClicked" />
                <TextBlock Margin="3" PointerReleased="SomethingClicked" >
                    Courtesy of the StackPanel
                </TextBlock>
            </StackPanel>
        </Label>

        <ListBox Margin="5" Name="lstMessages" Grid.Row="1"/>
        <CheckBox Margin="5" Grid.Row="2" Name="chkHandle">Handle first event</CheckBox>
        <Button Click="cmdClear_Click" Grid.Row="3" HorizontalAlignment="Right" Margin="5" Padding="3">Clear List</Button>
    </Grid>
</Window>

BubbledLabelClick.axaml.cs代码

using Avalonia;
using Avalonia.Controls;
using Avalonia.Input;
using Avalonia.Interactivity;
using Avalonia.Markup.Xaml;
using Avalonia.VisualTree;
using Shares.Avalonia;
using System;

namespace AvaloniaUI;

public partial class BubbledLabelClick : Window
{
    public BubbledLabelClick()
    {
        InitializeComponent();
        this.AddHandler(PointerReleasedEvent, SomethingClicked, RoutingStrategies.Bubble);
    }

    protected int eventCounter = 0;

    private void SomethingClicked(object? sender, PointerReleasedEventArgs e)
    {
        eventCounter++;
        string message = $"#{eventCounter}:\nSender:{sender?.ToString()}\nSource:{e.Source}\nOriginal Source:{e.OriginalSource()}";
        lstMessages.Items.Add(message);
        e.Handled = chkHandle.IsChecked ?? false;
    }

    private void cmdClear_Click(object? sender, RoutedEventArgs e)
    {
        eventCounter = 0;
        lstMessages.Items.Clear();
    }
}

运行效果