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 Horizontalscrollbarvisibility 设置为可见。动画完成后，我想授予 hittestvisibility 并再次将 Horizontalscrollbarvisibility 设置为 Disabled。后者是问题所在：当我将 Horizontalscrollbarvisibility 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