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我在 WP7 中创建了一个 Scrollviewer，它包含 3 个用户控件，每个用户控件都保存为 XAML 创建的用户控件的内容。这工作正常。此滚动查看器应该能够在这些项目之间滚动，但使用户无法滚动。因此，当单击这些内容之一中的项目时，滚动查看器会根据所选项目向左或向右滑动，并显示其他用户控件之一。我使用调解器来完成此操作：

<Grid.Resources>
        <Storyboard x:Name="ItemAnimation">
            <DoubleAnimation x:Name="ItemAnimationContent"
                             Storyboard.TargetName="Mediator"
                             Storyboard.TargetProperty="ScrollableWidthMultiplier"/>
        </Storyboard>
</Grid.Resources> 
<ScrollViewer Name="ScrollableItemPanel" 
                  Grid.Row="2" 
                  Grid.RowSpan="3" 
                  Grid.ColumnSpan="3"
                  VerticalScrollBarVisibility="Disabled"
                  HorizontalScrollBarVisibility="Disabled">

        <StackPanel Orientation="Horizontal">
            <UserControl    Name="NewsListBoxControl" Width="480" />
            <UserControl    Name="DetailedItemControl" Width="480"/>            
            <UserControl    Name="ExternalBrowserItemControl" Width="480"/>
        </StackPanel>
    </ScrollViewer>

    <local:ScrollableItemAnimationMediator x:Name="Mediator" 
                                           ScrollViewer="{Binding ElementName=ScrollableItemPanel}"/>

基本上，这也很好用，我可以在项目之间导航，并将内容作为用户控件加载到它们上面。但问题在于授予用户滚动的能力。在项目滚动之前，我将 hittestvisibilty 设置为 true，并将 Horizo​​ntalscrollbarvisibility 设置为可见。动画完成后，我想授予 hittestvisibility 并再次将 Horizo​​ntalscrollbarvisibility 设置为 Disabled。后者是问题所在：当我将 Horizo​​ntalscrollbarvisibility 设置为 Disabled 时，scrollviewer 会自动将堆栈面板中的三个项目中的第一个带回到视图中。我怎样才能阻止这个？这是我用来滚动中介的代码：

private void CreateDetailedArticleItem( Dictionary<string, string> itemQuery )
    {
        _articleDetailPage.ItemQuery = itemQuery;
        DetailedItemControl.Content = _articleDetailPage as UserControl;
        Animate( _articleDetailPage, 0.0f, 0.5f, 250 );
    }

private void Animate( IContentControl control, float from, float to, double milliseconds )
    {                                                                                                                            
        //this eventhandler will fire when the animation has completed
        EventHandler handler = null;
        //we take away the User Input just for the moment, so that we can animate without the user interfering. Also, we make horizontalScroll Visible
        IsUserEnabled = false;

        //we then set the content of the animation. Where from will it move, towards where and in what duration?
        ItemAnimationContent.From = from;
        ItemAnimationContent.To = to;
        ItemAnimationContent.Duration = TimeSpan.FromMilliseconds( milliseconds );
        //we start the animation
        ItemAnimation.Begin( );

        //we tell the new control that it will appear soon, so it can load its main content
        control.ViewWillAppear( );
        //also, we tell the currentcontrol that it will disappear soon, so it can unload its content and eventhandlers and so on
        CurrentControl.ViewWillDisAppear( );

        //the handler is a delegate. This way, it becomes rather easy and clean to fire the completed event, without creating a strong reference ( well, actually,
        //we do create a strong reference, but as soon as it is fired, we remove it again, shhhh! ).
        handler = delegate( object sender, EventArgs e )
        {
            //as stated, we remove the eventlistener again, so it won't keep firing all the time
            ItemAnimation.Completed -= handler;

            //after the animation, we tell the new control that it is now in screen, and can start downloading its data
            control.ViewDidAppear( );
            //at the same time, the "current" control has fully moved out of view, so it can now fully unload all its content.
            CurrentControl.ViewDidDisAppear( );
            //now, all we have to do is to make sure that the next time an item is being loaded, the new content is spoken to, not the old one
            CurrentControl = control;

            //and finally, enable the users input again, and remove the horizontal scrollbarvisibility
            IsUserEnabled = true;                
        };            
        ItemAnimation.Completed += handler;
    }
 private bool IsUserEnabled
    {
        set
        {
            //when the user can control the scrollviewer, then the horizontal scrollvisibility is disabled, so that the user cannot move horizontally,
            //otherwise, so we only make it visible when the program needs to animate.
            ScrollableItemPanel.IsHitTestVisible = value;
            ScrollableItemPanel.HorizontalScrollBarVisibility = value ? ScrollBarVisibility.Disabled : ScrollBarVisibility.Visible;
        }
    }

我已经问过这个问题，然后将其视为已回答，因为我认为它已回答，即使用 ScrollbarVisibility.Hidden 而不是 ScrollbarVisibility.Disabled，只有滚动条可见性保持可见，并且用户仍然可以滚动。有没有办法解决这个问题？

任何帮助将不胜感激。格雷茨

4

1 回答 1

1

与其对抗本机控件的行为，不如使用自定义控件（包装您的其他控件）自己操纵项目的位置可能更容易，该控件根据“选定”项目在不同的视觉状态之间进行动画处理（调整平移变换） .

于 2012-05-04T08:40:54.710 回答