更改 UWP FlipView

Question

是否可以在UWP Flipview控件中更改图片时更改动画效果？与其滑入，我更喜欢交叉淡入淡出效果。

我没看到办法，但我想确认一下。感谢您的帮助。

谢谢。

Answer 1

没有仔细查看，但在默认模板 (https://msdn.microsoft.com/en-us/library/windows/apps/mt299124.aspx) 中有一个用于项目的水平堆栈面板和一个滚动查看器，所以我真的不知道这样做的方法。

就我个人而言，我认为编写一个自定义控件会更容易，当用户按下按钮或其他东西时，它会淡入淡出集合中的项目

Answer 2

您应该能够在隐藏代码中手动覆盖动画。首先，使用 UseTouchAnimationsForAllNavigation="False".

禁用内置动画

    <FlipView x:Name="FlipView" UseTouchAnimationsForAllNavigation="False" SelectionChanged="Selector_OnSelectionChanged" >
        <FlipView.Items>
            <Grid Background="Red"></Grid>
            <Grid Background="Blue"></Grid>
            <Grid Background="Green"></Grid>
        </FlipView.Items>
    </FlipView>

然后，运行代码隐藏中的故事板：

    private void Selector_OnSelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        if (e.AddedItems.Count <= 0) return;
        if (e.RemovedItems.Count <= 0) return;

        var newSelectedItem = FlipView.ItemContainerGenerator.ContainerFromItem(e.AddedItems[0]) as FlipViewItem;
        var previousSelectedItem = FlipView.ItemContainerGenerator.ContainerFromItem(e.RemovedItems[0]) as FlipViewItem;

        if (newSelectedItem == null) return;
        if (previousSelectedItem == null) return;

        var duration = new Duration(TimeSpan.FromMilliseconds(500));

        var hideAnimation = new DoubleAnimation
        {
            From = 1.0,
            To = 0.0,
            AutoReverse = false,
            Duration = duration
        };

        var hideSb = new Storyboard();
        hideSb.Children.Add(hideAnimation);
        Storyboard.SetTargetProperty(hideSb, "Opacity");
        Storyboard.SetTarget(hideSb, previousSelectedItem);

        hideSb.Begin();

        var showAnimation = new DoubleAnimation
        {
            From = 0.0,
            To = 1.0,
            AutoReverse = false,
            Duration = duration
        };

        var showSb = new Storyboard();
        showSb.Children.Add(showAnimation);
        Storyboard.SetTargetProperty(showSb, "Opacity");
        Storyboard.SetTarget(showSb, newSelectedItem);

        showSb.Begin();
    }

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