Question

我有一个带有FlipView的Windows Phone 8.1应用程序。每个FlipView项目代表一个杂志页面（PDF页面呈现为具有一些叠加的位图）。

我需要启用捏合来缩放所有页面。我的FlipView ItemTemplate看起来像这样

<DataTemplate
        x:Key="SinglePageTemplate">
        <ScrollViewer                
            ZoomMode="Enabled">
            <Grid>
                <ProgressRing
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center"
                    IsActive="{Binding IsRendered, Converter={StaticResource BooleanNegateConverter}}" />
                <Image
                    Source="{Binding Bitmap}"
                    VerticalAlignment="Stretch"
                    HorizontalAlignment="Stretch">
                </Image>
            </Grid>
        </ScrollViewer>

问题在于，当我缩小页面并尝试将其向右移动时，它总是“跳”回到左侧。

以下是显示问题的视频：https://dl.dropboxusercontent.com/u/73642/fv.avi

任何想法为什么以及如何解决它？

Answer 1

在您的滚动查看器中，您必须手动启用scrollbarvisiblity和模式

<ScrollViewer ZoomMode="Enabled"
              HorizontalScrollBarVisibility="Visible"
              VerticalScrollBarVisibility="Visible"
              HorizontalScrollMode="Enabled"
              VerticalScrollMode="Enabled">
        <Grid>
            <ProgressRing
                HorizontalAlignment="Center"
                VerticalAlignment="Center"
                IsActive="{Binding IsRendered, Converter={StaticResource BooleanNegateConverter}}" />
            <Image
                Source="{Binding Bitmap}"
                VerticalAlignment="Stretch"
                HorizontalAlignment="Stretch">
            </Image>
        </Grid>
 </ScrollViewer>

您也可以选择设置Max / MinZoomFactor以防止重叠

Answer 2

我遇到了同样的问题。我通过使用附加行为并设置HorizontalScrollBarVisibility="Visible" VerticalScrollBarVisibility="Visible"

来解决它

以下是用于附加行为的代码

public class PanAndZoomBehavior : Behavior<ScrollViewer>
    {
        protected override void OnAttached()
        {
            base.OnAttached();            
            Window.Current.SizeChanged += OnSizeChanged;
            SetElementSize();

        }

        protected override void OnDetaching()
        {
            base.OnDetaching();            
            Window.Current.SizeChanged -= OnSizeChanged;
        }

        private void OnSizeChanged(object sender, Windows.UI.Core.WindowSizeChangedEventArgs e)
        {
            SetElementSize();
        }

        private void SetElementSize()
        {
            AssociatedObject.Width = Window.Current.Bounds.Width;
            AssociatedObject.Height = Window.Current.Bounds.Height;
            if (AssociatedObject.Content != null)
            {
                FrameworkElement element = (FrameworkElement)AssociatedObject.Content;
                element.Width = Window.Current.Bounds.Width;
                element.Height = Window.Current.Bounds.Height;
            }
        }

    }

将此行为应用于ScrollViewer

在FlipView中使用ScrollViewer

2 个答案: