我想要一个带圆角矩形的WPF画布,我可以用鼠标拖动。但是,一旦我尝试在画布上捕获鼠标,我就不会再收到移动事件了。WPF在CaptureMouse()后不发送MouseMove事件;
这是一个“mycanvas”用户控件,矩形是“foo”用户控件。在XAML这些(减去前序)是:
mycanvas.xaml:
<Canvas MouseDown="CanvasMouseDown" MouseMove="CanvasMouseMove" MouseUp="CanvasMouseUp" Background="White">
<my:Foo HorizontalAlignment="Left" Canvas.Left="97" Canvas.Top="30" x:Name="m_foo" VerticalAlignment="Top" Height="87" Width="128" />
</Canvas>
foo.xaml:
<Border BorderThickness="2" BorderBrush="Black" CornerRadius="15" Background="Plum">
<Grid>
<Label Content="Foo" Height="28" HorizontalAlignment="Left" Margin="6,6,0,0" Name="label1" VerticalAlignment="Top" />
</Grid>
</Border>
然后是处理程序是: mycanvas.xaml.cs:
private void CanvasMouseDown(object sender, MouseButtonEventArgs e)
{
if (e.Source is Foo)
{
m_moving = e.Source as Foo;
CaptureMouse();
e.Handled = true;
}
}
private void CanvasMouseMove(object sender, MouseEventArgs e)
{
if (m_moving != null)
{
Canvas.SetLeft(m_moving, e.GetPosition(this).X);
Canvas.SetTop(m_moving, e.GetPosition(this).Y);
}
}
private void CanvasMouseUp(object sender, MouseButtonEventArgs e)
{
ReleaseMouseCapture();
m_moving = null;
}
MouseDown会发生火灾,所以CaptureMouse会被调用(并且因为我无法再修复选择应用程序或单击其中的任何内容!)但MouseMove永远不会被调用 - 那么MouseMove事件现在发送到哪里?
如果我alt选项卡到另一个应用程序,然后现在回去suddendly调用MouseMove和Foo随鼠标移动。
似乎工作。谢谢。 (仍然不太明白为什么,但嘿..) – MrPurpleStreak 2010-08-02 14:34:57