private void Page_Unloaded(object sender, RoutedEventArgs e)
{
if (parallaxAnimation0 != null)
{
parallaxAnimation0.Dispose();
parallaxAnimation0 = null;
}
if (parallaxAnimation1 != null)
{
parallaxAnimation1.Dispose();
parallaxAnimation1 = null;
}
if (parallaxAnimation2 != null)
{
parallaxAnimation2.Dispose();
parallaxAnimation2 = null;
}
if (parallaxAnimation3 != null)
{
parallaxAnimation3.Dispose();
parallaxAnimation3 = null;
}
if (parallaxAnimation4 != null)
{
parallaxAnimation4.Dispose();
parallaxAnimation4 = null;
}
if (scrollViewerProperties != null)
{
scrollViewerProperties.Dispose();
scrollViewerProperties = null;
}
IndAni.Stop();
}
private void ScrollViewer_Loaded(object sender, RoutedEventArgs e)
{
Compositor compositor = ElementCompositionPreview.GetElementVisual(this).Compositor;
// 创建驱动视差滚动的表达式动画。
parallaxAnimation0 = compositor.CreateExpressionAnimation("MyForeground.Translation.X / MyParallaxRatio");
parallaxAnimation1 = compositor.CreateExpressionAnimation("MyForeground.Translation.X / MyParallaxRatio");
parallaxAnimation2 = compositor.CreateExpressionAnimation("MyForeground.Translation.X / MyParallaxRatio");
parallaxAnimation3 = compositor.CreateExpressionAnimation("MyForeground.Translation.X / MyParallaxRatio");
parallaxAnimation4 = compositor.CreateExpressionAnimation("((MyForeground.Translation.X / MyParallaxRatio) + offset)");
// 设置对前景对象的引用。
scrollViewerProperties = ElementCompositionPreview.GetScrollViewerManipulationPropertySet(RootScroll);
parallaxAnimation0.SetReferenceParameter("MyForeground", scrollViewerProperties);
parallaxAnimation1.SetReferenceParameter("MyForeground", scrollViewerProperties);
parallaxAnimation2.SetReferenceParameter("MyForeground", scrollViewerProperties);
parallaxAnimation3.SetReferenceParameter("MyForeground", scrollViewerProperties);
parallaxAnimation4.SetReferenceParameter("MyForeground", scrollViewerProperties);
// 设置背景对象视差滚动的速度。
parallaxAnimation0.SetScalarParameter("MyParallaxRatio", 1f);
parallaxAnimation1.SetScalarParameter("MyParallaxRatio", 2f);
parallaxAnimation2.SetScalarParameter("MyParallaxRatio", 4f);
parallaxAnimation3.SetScalarParameter("MyParallaxRatio", 8f);
parallaxAnimation4.SetScalarParameter("MyParallaxRatio", 0.5f);
parallaxAnimation4.SetScalarParameter("offset", 3 * (float)ActualWidth);
var backgroundVisual0 = ElementCompositionPreview.GetElementVisual(BGLayer0);
var backgroundVisual1 = ElementCompositionPreview.GetElementVisual(BGLayer1);
var backgroundVisual2 = ElementCompositionPreview.GetElementVisual(BGLayer2);
var backgroundVisual3 = ElementCompositionPreview.GetElementVisual(BGLayer3);
var backgroundVisual4 = ElementCompositionPreview.GetElementVisual(RootFrame);
// 对背景对象开始视差动画。
backgroundVisual0.StartAnimation("Offset.X", parallaxAnimation0);
backgroundVisual1.StartAnimation("Offset.X", parallaxAnimation1);
backgroundVisual2.StartAnimation("Offset.X", parallaxAnimation2);
backgroundVisual3.StartAnimation("Offset.X", parallaxAnimation3);
backgroundVisual4.StartAnimation("Offset.X", parallaxAnimation4);
MainFrame.Navigate(typeof(CitiesPage), "nimabi");
IndAni.Begin();
}
