wpf - VisualStateManager 无法为 ThicknessAnimations 生成过渡

Question

我定义了以下视觉状态:

<VisualStateManager.VisualStateGroups>
    <VisualStateGroup Name="EditStates">

        <VisualStateGroup.Transitions>
            <VisualTransition GeneratedDuration="0:0:2"/>
        </VisualStateGroup.Transitions>

        <VisualState Name="Editing" />                          
        <VisualState Name="Normal">
            <Storyboard>
                <ThicknessAnimation Storyboard.TargetName="ViewBorder" Storyboard.TargetProperty="Margin" To="0" Duration="0"/>
                <DoubleAnimation    Storyboard.TargetName="Header"     Storyboard.TargetProperty="(FrameworkElement.LayoutTransform).(ScaleTransform.ScaleY)" To="0" Duration="0"/>
                <ColorAnimation     Storyboard.TargetName="EditBorder" Storyboard.TargetProperty="Background.Color" To="Red" Duration="0"/>
            </Storyboard>
        </VisualState>                                          

    </VisualStateGroup>
</VisualStateManager.VisualStateGroups>

DoubleAnimation和 ColorAnimation工作正常，使用 VisualStateManager为他们生成超过 2 秒的过渡动画。

然而， ThicknessAnimation没有动画。相反，它会在过渡期结束时捕捉到完成值。

有什么办法可以拿到 VisualStateManager为其生成过渡，还是我将被迫提供手动过渡？

Answer 1

我分析了问题，火了.NET Reflector并发现 VisualStateManager仅支持以下动画:

彩色动画

双动画

点动画

这有点糟糕，因为它没有记录在任何地方。

为了证明它无法生成动画，请查看 VisualStageManager.GenerateToAnimation 的反向代码方法。还有一个 VisualStageManager.GenerateFromAnimation支持相同的动画子集。

private static Timeline GenerateToAnimation(FrameworkElement root, Timeline timeline, IEasingFunction easingFunction, bool isEntering)
{
  Timeline destination = null;

  if (destination == null)
  {
    var targetColor = GetTargetColor(timeline, isEntering);
    if (targetColor.HasValue)
      destination = new ColorAnimation { To = targetColor, EasingFunction = easingFunction };
  }

  if (destination == null)
  {
    var targetDouble = GetTargetDouble(timeline, isEntering);
    if (targetDouble.HasValue)
        destination = new DoubleAnimation { To = targetDouble, EasingFunction = easingFunction };

  }

  if (destination == null)
  {
    var targetPoint = GetTargetPoint(timeline, isEntering);
    if (targetPoint.HasValue)
        destination = new PointAnimation { To = targetPoint, EasingFunction = easingFunction };
  }

  if (destination != null)
    CopyStoryboardTargetProperties(root, timeline, destination);

  return destination;
}

底线...您只能在 VisualStageManager 中使用 Color、Double 或 Point 动画。如果您需要其他东西，请恢复到老式触发器...