在事件触发器中处理自定义 RoutedEvent

Question

我有以下树 MainWindow -> Custom UserControl -> GroupBox -> ViewBox

我已经向 UserControl 添加了一个自定义路由事件，如下所示：

  public static readonly RoutedEvent ConnectedEvent =
        EventManager.RegisterRoutedEvent("Connected", RoutingStrategy.Tunnel,
        typeof(RoutedEventHandler), typeof(IQMasterControl));

    public event RoutedEventHandler Connected
    {
        add { AddHandler(IQMasterControl.ConnectedEvent, value); }
        remove { RemoveHandler(IQMasterControl.ConnectedEvent, value); }
    }

事件的调用如下：

 _masterViewModel.Connected += delegate ()
        {
            RoutedEventArgs ea = new RoutedEventArgs(IQMasterControl.ConnectedEvent, this);
            this.RaiseEvent(ea);
        };

我想使用事件触发器在“连接”事件上的 ViewBox 上运行一些动画：

<Viewbox VerticalAlignment="Center"
                      Child="{StaticResource PDataIco}"
                      RenderTransformOrigin="0.5, 0.5" Stretch="Uniform">
                        <Viewbox.RenderTransform>
                            <!--  the transform a name tells the framework not to freeze it  -->
                            <RotateTransform x:Name="noFreeze" />
                        </Viewbox.RenderTransform>
                        <Viewbox.Triggers>
                            <EventTrigger RoutedEvent="local:IQMasterControl.Connected">
                                <BeginStoryboard>
                                    <Storyboard>
                                        <DoubleAnimation RepeatBehavior="Forever" Storyboard.TargetProperty="(Rectangle.RenderTransform).(RotateTransform.Angle)" To="360" Duration="0:0:1" />
                                    </Storyboard>
                                </BeginStoryboard>
                            </EventTrigger>
                        </Viewbox.Triggers>
                    </Viewbox>

我已经检查过该事件是否已引发，但ViewBox似乎没有收到该事件。所以，没有动画开始。

如果我将 EventTrigger 的 RoutedEvent 属性更改为另一个（fe Loaded），动画效果很好。

谁可以帮我这个事？

Answer 1

您正在event为UserControl.

它不是为ViewBox.

有两种方法：

两者都需要添加名称ViewBox：

<Viewbox VerticalAlignment="Center" x:Name="ViewBox"
                  Child="{StaticResource PDataIco}"
                  RenderTransformOrigin="0.5, 0.5" Stretch="Uniform">
                    <Viewbox.RenderTransform>
                        <!--  the transform a name tells the framework not to freeze it  -->
                        <RotateTransform x:Name="noFreeze" />
                    </Viewbox.RenderTransform>
                    <Viewbox.Triggers>
                        <EventTrigger RoutedEvent="local:IQMasterControl.Connected">
                            <BeginStoryboard>
                                <Storyboard>
                                    <DoubleAnimation RepeatBehavior="Forever" Storyboard.TargetProperty="(Rectangle.RenderTransform).(RotateTransform.Angle)" To="360" Duration="0:0:1" />
                                </Storyboard>
                            </BeginStoryboard>
                        </EventTrigger>
                    </Viewbox.Triggers>
</Viewbox>

1. 提高它ViewBox：

_masterViewModel.Connected += delegate ()
    {
        RoutedEventArgs ea = new RoutedEventArgs(IQMasterControl.ConnectedEvent, this);
        ViewBox.RaiseEvent(ea);
    };

或者

2.处理UserControl：

<UserControl.Triggers>
    <EventTrigger RoutedEvent="local:IQMasterControl.Connected">
        <BeginStoryboard>
            <Storyboard>
                <DoubleAnimation RepeatBehavior="Forever" Storyboard.Target="{Binding ElementName=Viewbox}" Storyboard.TargetProperty="(Rectangle.RenderTransform).(RotateTransform.Angle)" To="360" Duration="0:0:1" />
            </Storyboard>
        </BeginStoryboard>
    </EventTrigger>
</UserControl.Triggers>