Windows Phone 7为Silverlight和XNA提供了一个非常灵敏的可触摸的屏幕,它不像一些旧的模拟鼠标的触屏,或识别字迹的屏。
在Windows Phone 7的多触摸屏上可以检测到至少四根同时存在的手指,并且一起操作使触摸屏充分发挥效果
在silverlight开发中通过事件来实现触屏事件的检测,包括低级别的和高级别的接口。低级别主要是FrameReported 事件,高级别的是定义在UIElement类中的事件,包含ManipulationStarted,Manipulationdelta,ManipulationCompleted,这三个事件互相配合来完成触控操作,它们可以在任何UIElement的子类中使用。
今天这讲是Manipulation事件。
一、事件说明
1.ManipulationStarted事件
当手指按下触摸屏时发生
2.Manipulationdelta
当手指在触摸屏移动时发生
3.ManipulationCompleted
当手指释放触摸屏时发生
二、具体运用
1.新建项目
2.添加一张图片用于演示
3.修改MainPage.xaml
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<TextBlock x:Name="title" FontSize="40" Text="Multi-Touch" TextAlignment="Center"/>
<Canvas x:Name="ContentCanvas" Grid.Row="1">
<Image Source="1.jpg"
x:Name="image1" Stretch="Fill" Width="500" ManipulationDelta="image1_ManipulationDelta" ManipulationStarted="image1_ManipulationStarted" ManipulationCompleted="image1_ManipulationCompleted">
</Image>
</Canvas>
<TextBlock x:Name="info" FontSize="25" Grid.Row="2" TextWrapping="Wrap" Width="500" MinHeight="40" Text="屏幕信息" TextAlignment="Center" VerticalAlignment="Bottom"/>
</Grid>
Image用于演示
TextBlock用于显示移动手指的坐标信息
4.修改MainPage.cs
public partial class MainPage : PhoneApplicationPage
{
private CompositeTransform compositeTransform;
// Constructor
public MainPage()
{
InitializeComponent();
SupportedOrientations = SupportedPageOrientation.Portrait | SupportedPageOrientation.Landscape;
// ManipulationDelta += image1_ManipulationDelta;
compositeTransform = new CompositeTransform();
image1.RenderTransform = compositeTransform;
}
private void image1_ManipulationDelta(Object sender, ManipulationDeltaEventArgs e)
{
if (e.DeltaManipulation.Scale.X != 0)
compositeTransform.ScaleX *= e.DeltaManipulation.Scale.X;
if (e.DeltaManipulation.Scale.Y != 0)
compositeTransform.ScaleY *= e.DeltaManipulation.Scale.Y;
compositeTransform.TranslateX += e.DeltaManipulation.Translation.X;
compositeTransform.TranslateY += e.DeltaManipulation.Translation.Y;
this.info.Text = "图片移动中" + "\n" + "X:" + e.ManipulationOrigin.X.ToString() + " " + "Y:" + e.ManipulationOrigin.Y.ToString();
}
private void image1_ManipulationStarted(object sender, ManipulationStartedEventArgs e)
{
this.info.Text = "图片开始移动"+"\n"+"X:"+e.ManipulationOrigin.X.ToString()+" "+"Y:"+e.ManipulationOrigin.Y.ToString();
}
private void image1_ManipulationCompleted(object sender, ManipulationCompletedEventArgs e)
{
this.info.Text = "图片停止移动" + "\n" + "X:" + e.ManipulationOrigin.X.ToString() + " " + "Y:" + e.ManipulationOrigin.Y.ToString();
}
}