canvas 超出部分自动隐藏

概述  <Canvas x:Name="a" Background="White" Loaded="LayoutRoot_Loaded">             <Canvas.Clip>                 <RectangleGeometry RadiusX="5" RadiusY="5" Rect="0,0, 300, 50" />             </Canvas.Cli @H_502_1@   <Canvas x:name="a" Background="White" Loaded="LayoutRoot_Loaded">
            <Canvas.Clip>
                <RectangleGeometry RadiusX="5" RadiusY="5" Rect="0,300,50" />
            </Canvas.Clip>
            <Canvas.Triggers>
                <EventTrigger RoutedEvent="Canvas.Loaded" >
                    <BeginStoryboard>
                        <Storyboard x:name="animation" Storyboard.TargetProperty="(Canvas.left)" RepeatBehavior="Forever" >
                            <DoubleAnimation Storyboard.Targetname="ScrollingText" From="0" To="-820" Duration="0:0:20"  />
                            <DoubleAnimation Storyboard.Targetname="ScrollingText2" From="820" To="0" Duration="0:0:20"  />
                        </Storyboard>
                    </BeginStoryboard>
                </EventTrigger>
            </Canvas.Triggers>
            <TextBlock x:name="ScrollingText" FontFamily="Comic Sans MS" FontSize="36" Foreground="Green"  Text="I have downloaded the moded bios for the x200 which is revision 3.03. The new 3.05 Bios for x200 add some support for windows 7. " />
            <TextBlock x:name="ScrollingText2" FontFamily="Comic Sans MS" FontSize="36" Foreground="Green" Text="I have downloaded the moded bios for the x200 which is revision 3.03. The new 3.05 Bios for x200 add some support for windows 7. " />
        </Canvas>

启到作用的是canvas.clip

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