检测控件外部的点击

Question

当用户单击按钮时，我在网格中显示TestControl：

<Grid>
    <myControls:TestControl Panel.ZIndex="2" Visibility="Collapsed" Width="100" Height="100" />
    <Button "Open Test Control" Click="btnOpen_Click" />
</Grid>

当用户单击此控件之外时，如何隐藏测试控件？

Answer 1

您可以处理Grid的PreviewMouseLeftButtonDown事件：

<Grid Background="Transparent" PreviewMouseLeftButtonDown="Grid_PreviewMouseLeftButtonDown">
    <Grid.RowDefinitions>
        <RowDefinition />
        <RowDefinition />
    </Grid.RowDefinitions>
    <myControls:TestControl x:Name="tc" Visibility="Collapsed" Width="100" Height="100" />
    <Button Content="Open Test Control" Click="btnOpen_Click" Grid.Row="1" />
</Grid>

---

private void Grid_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
    if (!tc.IsMouseOver)
        tc.Visibility = Visibility.Collapsed;
}

Answer 2

还没有尝试过，但 LostFocus 事件可能是一种方法，因为您在显示测试控件后将焦点设置为测试控件。