与WPF相同Windows 8.1应用中也具有高级触控操作(Manipulation),其中包含了三种常见的触屏手势:平移、缩放、旋转,通过以下四种事件可为控件实现各种触控操作:ManipulationStarting、ManipulationStarted、ManipulationDelta、ManipulationInertiaStarting、ManipulationCompleted。
打开Visual Studio 2013 Preview,新建Windows Store应用。在XAML代码中添加Image控件,将ManipulationMode设置为ALL(也可按需要选择不同模式),并为其添加ManipulationStarting、ManipulationDelta、ManipulationCompleted事件,以便后续实现相关手势操作内容。RenderTransform中的CompositeTransform是一个控件变形组合,可容纳多种变形属性,如平移、旋转、缩放。
<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
<Canvas>
<Image x:Name="imageElement" Source="images/cliff.jpg"
Height="460" Width="758" Canvas.Left="300" Canvas.Top="150"
ManipulationMode="All"
ManipulationStarting="image_ManipulationStarting"
ManipulationDelta="image_ManipulationDelta"
ManipulationCompleted="image_ManipulationCompleted">
<Image.RenderTransform>
<CompositeTransform x:Name="imageCT"/>
</Image.RenderTransform>
</Image>
</Canvas>
</Grid>
接下来,编写每个事件的具体内容,如下代码:
private void image_ManipulationStarting(object sender, ManipulationStartingRoutedEventArgs e)
{
e.Handled = true;
}
private void image_ManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)
{
FrameworkElement element = e.OriginalSource as FrameworkElement;
element.Opacity = 0.5;
imageCT.TranslateX += e.Delta.Translation.X;
imageCT.TranslateY += e.Delta.Translation.Y;
imageCT.ScaleX *= e.Delta.Scale;
imageCT.ScaleY *= e.Delta.Scale;
imageCT.Rotation += e.Delta.Rotation;
}
private void image_ManipulationCompleted(object sender, ManipulationCompletedRoutedEventArgs e)
{
FrameworkElement element = e.OriginalSource as FrameworkElement;
element.Opacity = 1;
}
这些代码很好理解,当ManipulationDelta触发后,首先将控件透明度设置为0.5,然后捕捉触控操作并对TranslateX、TranslateY(平移);ScaleX、ScaleY(缩放)、Rotation(旋转)进行修改。最后ManipulationCompleted结束后将控件透明度恢复即可。按下F5键看看效果如何。
本文转自Gnie博客园博客,原文链接http://www.cnblogs.com/gnielee/p/windowsapp-manipulation.html,如需转载请自行联系原作者