我正在为Windows Universal应用程序实现手势交互控件。但是我发现了一个问题,如果我为容器定义手势设置而不是父TextBox
,那么控件将无法点击。
这是一个简化的布局代码:
<Page x:Class="App.MainPage">
<Grid x:Name="RootGrid" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<TextBox Grid.Row="0" />
<Button Grid.Row="1" Content="Click" />
</Grid>
</Page>
这是一个简化的代码,允许重现行为:
public sealed partial class MainPage : Page
{
private GestureRecognizer _gr = new GestureRecognizer();
public FrameworkElement Container { get; set; }
public MainPage()
{
this.InitializeComponent();
this.NavigationCacheMode = NavigationCacheMode.Required;
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
this.Container = this.RootGrid;
this.Container.PointerCanceled += OnPointerCanceled;
this.Container.PointerPressed += OnPointerPressed;
this.Container.PointerMoved += OnPointerMoved;
this.Container.PointerReleased += OnPointerReleased;
_gr.CrossSlideHorizontally = true;
_gr.GestureSettings = GestureSettings.ManipulationTranslateRailsX;
}
private void OnPointerCanceled(object sender, PointerRoutedEventArgs e)
{
_gr.CompleteGesture();
e.Handled = true;
}
private void OnPointerPressed(object sender, PointerRoutedEventArgs e)
{
_gr.ProcessDownEvent(e.GetCurrentPoint(null));
this.Container.CapturePointer(e.Pointer);
e.Handled = true;
}
private void OnPointerMoved(object sender, PointerRoutedEventArgs e)
{
_gr.ProcessMoveEvents(e.GetIntermediatePoints(null));
e.Handled = true;
}
private void OnPointerReleased(object sender, PointerRoutedEventArgs e)
{
_gr.ProcessUpEvent(e.GetCurrentPoint(null));
e.Handled = true;
}
}
Debuggig告诉我,这种行为的主要原因是OnPointerPressed
处理程序。当我点击RootGrid
和TextBox
时会调用此方法,但是当我点击按钮时则不会。 object sender
始终为Windows.UI.Xaml.Controls.Grid
,因此无法确定TextBox
是否为<img>
。
最有趣的是,相同代码的工作方式与Windows应用程序的预期相同,但不适用于Windows Phone 8.1应用程序。
你能否给我任何建议如何在不影响内部控制的情况下实现手势识别?
答案 0 :(得分:0)
我没有找到比为PointerPressed
控件添加TextBox
事件处理程序更好的解决方案:
private void TextBox_OnPointerPressed(object sender, PointerRoutedEventArgs e)
{
e.Handled = true;
}
它阻止调用OnPointerPressed
this.Container
并允许以典型方式使用TextBox
。不是最好的解决方案,但对我来说也是如此。