从 XAML 到 C# 的 WPF 故事板

Question

我有一个自定义代码控件，它可以很好地处理静态值，但要让它处理动态值，我需要在代码中执行此操作，因为我必须延迟故事板的执行，直到呈现 TextBlock。我需要将以下 XAML 传输到 C# 但它不起作用：

<Canvas x:Name="PART_TickerCanvas" Grid.Row="1" Width="128" ClipToBounds="True">
                        <TextBlock x:Name="PART_TickerTextBlock">
                            <TextBlock.Triggers>
                                <EventTrigger RoutedEvent="Loaded">
                                    <BeginStoryboard>
                                        <Storyboard>
                                            <DoubleAnimation
                        Storyboard.TargetName="TickerTranslateTransform"
                        Storyboard.TargetProperty="X"
                        From="{Binding ElementName=TickerCanvas, Path=ActualWidth}" To="{Binding ElementName=PART_TickerTextBlock, Path=RenderSize.Width, Converter={StaticResource TextBlockWidthConverter}}" Duration="0:0:10"
                        RepeatBehavior="Forever"/>
                                        </Storyboard>
                                    </BeginStoryboard>
                                </EventTrigger>
                            </TextBlock.Triggers>
                            <TextBlock.RenderTransform>
                                <TranslateTransform x:Name="TickerTranslateTransform" X="{Binding ElementName=PART_TickerCanvas, Path=ActualWidth}" Y="0" />
                            </TextBlock.RenderTransform>
                        </TextBlock>
                    </Canvas>

转换器简单地否定了宽度。

这是我的 C# 方法：

public override void OnApplyTemplate()
    {
        base.OnApplyTemplate();
        if (Template != null)
        {
            _tickerTextBlock = Template.FindName("PART_TickerTextBlock", this) as TextBlock;
            _tickerCanvas = Template.FindName("PART_TickerCanvas", this) as Canvas;
            Dispatcher.BeginInvoke(new Action(() => {if (_tickerCanvas != null && _tickerTextBlock != null) StartTickerAnimation(); }), DispatcherPriority.ContextIdle, null);                
        }
    }

private void StartTickerAnimation()
    {
        var doubleAnimation = new DoubleAnimation
        {
            From = _tickerCanvas.ActualWidth,
            To = -_tickerTextBlock.RenderSize.Width,
            RepeatBehavior = RepeatBehavior.Forever,
            Duration = new Duration(new TimeSpan(0, 0, 10))
        };

        _tickerTextBlock.RenderTransform = new TranslateTransform(_tickerCanvas.ActualWidth, 0);
        RegisterName("TickerTranslateTransform", _tickerTextBlock.RenderTransform);          

        var storyBoard = new Storyboard();
        storyBoard.Children.Add(doubleAnimation);
        storyBoard.SetValue(Storyboard.TargetNameProperty, "TickerTranslateTransform");
        storyBoard.SetValue(Storyboard.TargetPropertyProperty, new PropertyPath(TranslateTransform.XProperty.Name));
        storyBoard.SetValue(Storyboard.TargetProperty, _tickerTextBlock.RenderTransform);
        _tickerTextBlock.BeginStoryboard(_storyBoard);
    }

我很确定 DoubleAnimation 在 C# 中是正确的，但后来出现了问题。任何帮助将不胜感激。

Answer 1

你不需要故事板。

像这样直接启动X属性的动画：

_tickerTextBlock.RenderTransform.BeginAnimation(
    TranslateTransform.XProperty, doubleAnimation);

从 XAML 到 C# 的 WPF 故事板

WPF Storyboard from XAML to C#

c#

wpf

animation

xaml

storyboard