LeftMouseButtonDown 不适用于路由事件中的按钮
我正在学习 wpf 中的路由事件，我尝试了以下示例：
文件 -- Window1.xaml
<ScrollViewer VerticalScrollBarVisibility="Auto">
<UniformGrid MouseDown="UniformGrid_MouseDown">
<Button x:Name="Button1">1</Button>
<Button x:Name="Button2">2</Button>
<Button x:Name="Button3">3</Button>
<Button x:Name="Button4">4</Button>
<Button x:Name="Button5">5</Button>
<Button x:Name="Button6">6</Button>
<Button x:Name="Button7">7</Button>
<Button x:Name="Button8">8</Button>
<Button x:Name="Button9">9</Button>
</UniformGrid>
</ScrollViewer>
文件 -- Window1.xaml.cs
private void UniformGrid_MouseDown(object sender, MouseButtonEventArgs e)
{
Button aTargetButton = e.Source as Button;
if (aTargetButton != null)
{
aTargetButton.Background = Brushes.Azure;
aTargetButton.LayoutTransform = new RotateTransform(45);
if (myPreviouslyClickedButton != null)
{
myPreviouslyClickedButton.Background = Brushes.White;
myPreviouslyClickedButton.LayoutTransform = new RotateTransform(0);
}
myPreviouslyClickedButton = aTargetButton;
}
}
当我运行这些片段时，仅当我右键单击时，相应的按钮才会经历角度转换它（即使我已经订阅了 MouseDown）。 你能帮我解决这个问题吗？
更新：
如果我用椭圆形替换按钮，这个片段似乎可以工作。 为什么按钮不能对左键单击做出反应，而椭圆可以。 此外，如果我多次单击同一个椭圆，则不会引发事件
I was learning about routed events in wpf and I tries the following example,
File -- Window1.xaml
<ScrollViewer VerticalScrollBarVisibility="Auto">
<UniformGrid MouseDown="UniformGrid_MouseDown">
<Button x:Name="Button1">1</Button>
<Button x:Name="Button2">2</Button>
<Button x:Name="Button3">3</Button>
<Button x:Name="Button4">4</Button>
<Button x:Name="Button5">5</Button>
<Button x:Name="Button6">6</Button>
<Button x:Name="Button7">7</Button>
<Button x:Name="Button8">8</Button>
<Button x:Name="Button9">9</Button>
</UniformGrid>
</ScrollViewer>
File -- Window1.xaml.cs
private void UniformGrid_MouseDown(object sender, MouseButtonEventArgs e)
{
Button aTargetButton = e.Source as Button;
if (aTargetButton != null)
{
aTargetButton.Background = Brushes.Azure;
aTargetButton.LayoutTransform = new RotateTransform(45);
if (myPreviouslyClickedButton != null)
{
myPreviouslyClickedButton.Background = Brushes.White;
myPreviouslyClickedButton.LayoutTransform = new RotateTransform(0);
}
myPreviouslyClickedButton = aTargetButton;
}
}
When I ran these snippets, the corresponding button undergoes a Angular Transformation only when I do a right click over it (even though I have subscribed for MouseDown). Can you help me out with this?
Update:
This snippet seems to work if i replace the button with an ellipse. Why can't the button react to left clicks when an ellipse can. Also the events are not raised if i click on the same ellipse more then once
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您的鼠标按下事件由按钮处理。
如果您希望网格处理按钮事件，那么您可以执行以下操作：
并将源更改为类似以下内容：
有一篇 msdn 文章 这里值得一读。
Your mouse down event is being handled by the button.
If you want your grid to handle the button events, then you might do something like:
and change the source to something like:
There's an msdn article here that would be worth a read.
这是正常工作的。 在内部，
Button处理MouseDown事件以了解何时触发其Click事件。 我发现 Snoop 是一个很好的工具，用于跟踪 WPF 事件问题，或者只是获取更好地了解它们的工作原理。This is working correctly. Internally, the
Buttonhandles theMouseDownevent to know when to fire off itsClickevent. I've found that Snoop is a great tool for tracking down problems with WPF events, or to just get a better understanding of how they work.