IsManipulationEnabled

通过控件的IsManipulationEnabled属性设置为true激活触屏手势操作( ManipulationStarting、ManipulationStarted、ManipulationDelta、ManipulationInertiaStarting、ManipulationCompleted )

<Window x:Class="WpfManipulation.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow" Height="500" Width="600">
    <Grid>
        <Canvas x:Name="touchPad" Background="Gray"                
                ManipulationStarting="image_ManipulationStarting"  
                ManipulationDelta="image_ManipulationDelta"
                ManipulationCompleted="image_ManipulationCompleted">
            <Image Canvas.Top="52" Canvas.Left="34" Width="200" 
                   IsManipulationEnabled="True" Source="Images/P1.jpg">
                <Image.RenderTransform>
                    <MatrixTransform></MatrixTransform>
                </Image.RenderTransform>
            </Image>
            <Image Canvas.Top="75" Canvas.Left="339" Width="200" 
                   IsManipulationEnabled="True" Source="Images/P2.jpg">
                <Image.RenderTransform>
                    <MatrixTransform></MatrixTransform>
                </Image.RenderTransform>
            </Image>
            <Image Canvas.Top="243" Canvas.Left="168" Width="200" 
                   IsManipulationEnabled="True" Source="Images/P3.jpg">
                <Image.RenderTransform>
                    <MatrixTransform></MatrixTransform>
                </Image.RenderTransform>
            </Image>
        </Canvas>
    </Grid>
</Window>

[参考]
WPF Multi-Touch 开发:高级触屏操作(Manipulation)

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