Question

已经坚持这一段很长一段时间了，不知道我哪里出错了。我收到了消息

Triggers collection members must be of type EventTrigger.

我认为我对触发器的了解是正确的，正是这种类型的触发器我不需要事件触发器。

这是我的加价

  <UserControl.Triggers>
     <Trigger SourceName="MainGrid" Property="Grid.IsMouseOver" Value="true">
         <Setter TargetName="DeleteButton" Property="TextBlock.Foreground" Value="#FF222222" />
     </Trigger>
 </UserControl.Triggers>

修改

这不是修复，但我已经以编程方式完成此操作，直到找到如何在XAML中解决此问题。

    private void MainGrid_MouseEnter(object sender, System.Windows.Input.MouseEventArgs e)
    {
        DeleteButton.Foreground = new SolidColorBrush(Color.FromArgb(255, 34, 34, 34));
    }

    private void MainGrid_MouseLeave(object sender, System.Windows.Input.MouseEventArgs e)
    {
        DeleteButton.Foreground = new SolidColorBrush(Color.FromArgb(255, 204, 204, 204));
    }

Answer 1

将下方的xaml放到UserControl.Triggers部分：

<EventTrigger SourceName="MainGrid" RoutedEvent="Grid.MouseEnter">
            <BeginStoryboard>
                <Storyboard Storyboard.TargetName="DeleteButton"
                            Storyboard.TargetProperty="Foreground.Color">
                    <ColorAnimationUsingKeyFrames BeginTime="00:00:00">
                        <LinearColorKeyFrame Value="Red"
                                             KeyTime="0:0:0" />
                    </ColorAnimationUsingKeyFrames>
                </Storyboard>
            </BeginStoryboard>            
        </EventTrigger>
        <EventTrigger SourceName="MainGrid"
                      RoutedEvent="Grid.MouseLeave">
            <BeginStoryboard >
                <Storyboard Storyboard.TargetName="DeleteButton"
                            Storyboard.TargetProperty="Foreground.Color">
                    <ColorAnimationUsingKeyFrames BeginTime="00:00:00">
                        <LinearColorKeyFrame Value="Black"
                                             KeyTime="0:0:0" />
                    </ColorAnimationUsingKeyFrames>
                </Storyboard>
            </BeginStoryboard>            
        </EventTrigger>

希望这有帮助。

XAML UserControl触发器

1 个答案: