uwp 移动控件 ManipulationDelta

 

<UserControl

    x:Class="TestCutPic.CutItem"

    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

    xmlns:local="using:TestCutPic"

    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"

    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 

    ManipulationMode="All"

    mc:Ignorable="d" Height="103.85" Width="133.131"  ManipulationDelta="UserControl_ManipulationDelta"  ManipulationStarted="UserControl_ManipulationStarted"

    RenderTransformOrigin="0.5,0.5"

    >

   <UserControl.RenderTransform>

      <CompositeTransform x:Name="ct"  TranslateX="0"/>

  </UserControl.RenderTransform>

    <Grid Background="Gray" >

       

    </Grid>

</UserControl>

       Point P = new Point();

        private void UserControl_ManipulationStarted(object sender, ManipulationStartedRoutedEventArgs e)

        {

            P =  e.Position;

        }

        private void UserControl_ManipulationDelta(object sender, ManipulationDeltaRoutedEventArgs e)

        {

            ct.TranslateX += e.Position.X-P.X;

            ct.TranslateY += e.Position.Y-P.Y;

 

//控制在一定范围内

 

if (ct.TranslateX > 500) {

 

                ct.TranslateX = 500;

            }

            if (ct.TranslateY > 400)

            {

                ct.TranslateY = 400;

            }

            //--------------------

            if (ct.TranslateX <- 20)

            {

                ct.TranslateX = -2;

            }

            if (ct.TranslateY < -50)

            {

                ct.TranslateY = -50;

            }

        }

 

 

        }