如何防止用鼠标移动网格走出屏幕？

问题描述

 < Grid x：Name =" grid"背景= QUOT;蓝色" 
 Width =" 100"高度= QUOT; 100" 
 MouseDown =" Grid_MouseDown"的MouseMove = QUOT; Grid_MouseMove"的MouseUp = QUOT; Grid_MouseUp"> 
< Grid.RenderTransform> 
< TranslateTransform x：Name =" tt" /> 
< /Grid.RenderTransform> 
< / Grid>  

< Window x：Class =" Test.window" ...> 
<网格x：名称="网格" ... 
< /窗口> 

  Point m_start; 
 Vector m_startOffset; 
 
 private void Grid_MouseDown（object sender，MouseButtonEventArgs e）
 {
 m_start = e.GetPosition（window）; 
 m_startOffset = new Vector（tt.X，tt.Y）; 
 grid.CaptureMouse（）; 
} 
 
 private void Grid_MouseMove（object sender，MouseEventArgs e）
 {
 if（grid.IsMouseCaptured）
 {
 Vector offset = Point.Subtract（e.GetPosition（window），m_start）; 
 
 tt.X = m_startOffset.X + offset.X; 
 tt.Y = m_startOffset.Y + offset.Y; 
} 
} 
 
 private void Grid_MouseUp（object sender，MouseButtonEventArgs e）
 {
 grid.ReleaseMouseCapture（）; 
}  

如何防止网格走出屏幕边界？

$

解决方案

<Grid x:Name="grid" Background="Blue" 
      Width="100" Height="100" 
      MouseDown="Grid_MouseDown" MouseMove="Grid_MouseMove" MouseUp="Grid_MouseUp">
    <Grid.RenderTransform>
        <TranslateTransform x:Name="tt"/>
    </Grid.RenderTransform>
</Grid>

<Window x:Class="Test.window"...>
    <Grid x:Name="grid"...
</Window>

Point m_start;
Vector m_startOffset;

private void Grid_MouseDown(object sender, MouseButtonEventArgs e)
{
    m_start = e.GetPosition(window);
    m_startOffset = new Vector(tt.X, tt.Y);
    grid.CaptureMouse();
}

private void Grid_MouseMove(object sender, MouseEventArgs e)
{
    if (grid.IsMouseCaptured)
    {
        Vector offset = Point.Subtract(e.GetPosition(window), m_start);

        tt.X = m_startOffset.X + offset.X;
        tt.Y = m_startOffset.Y + offset.Y;
    }
}

private void Grid_MouseUp(object sender, MouseButtonEventArgs e)
{
    grid.ReleaseMouseCapture();
}

How prevent the grid go out of the screen boundaries?

解决方案

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