WPF ScrollViewer/Canvas 鼠标事件处理程序

发布于 2024-12-21 11:41:14 字数 1066 浏览 3 评论 0原文

我创建了以下控件：

<UserControl x:Class="FooBar.AnnotationControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Height="400" Width="500" >
    <ScrollViewer Height="400" Width="500">
        <Canvas Height="400" Width="500" Name="ctlCanvas" MouseLeftButtonDown="MouseLeftButtonDownHandler" >
            <Canvas.RenderTransform>
                <ScaleTransform x:Name="ZoomTransform" />
            </Canvas.RenderTransform>
        </Canvas>
    </ScrollViewer>
</UserControl>

namespace FooBar
{

    public partial class AnnotationControl : UserControl
    {
        public AnnotationControl()
        {
            InitializeComponent();

        }

        private void MouseLeftButtonDownHandler( object sender, MouseButtonEventArgs args)
        {
           //Do Something
        }

    }

}

当我单击画布时，我不会在 MouseLeftButtonDownHandler 中命中断点。我什至将此处理程序附加到 ScrollViewer 并得到相同的结果。知道这是怎么回事吗？

原文

I've created the following control:

<UserControl x:Class="FooBar.AnnotationControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Height="400" Width="500" >
    <ScrollViewer Height="400" Width="500">
        <Canvas Height="400" Width="500" Name="ctlCanvas" MouseLeftButtonDown="MouseLeftButtonDownHandler" >
            <Canvas.RenderTransform>
                <ScaleTransform x:Name="ZoomTransform" />
            </Canvas.RenderTransform>
        </Canvas>
    </ScrollViewer>
</UserControl>

namespace FooBar
{

    public partial class AnnotationControl : UserControl
    {
        public AnnotationControl()
        {
            InitializeComponent();

        }

        private void MouseLeftButtonDownHandler( object sender, MouseButtonEventArgs args)
        {
           //Do Something
        }

    }

}

when I click the canvas, I don't hit breakpoints in the MouseLeftButtonDownHandler. I even attach this handler to the ScrollViewer and get the same result. Any idea what's going on here?

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

下壹個目標 2024-12-28 11:41:15

Canvas 的默认背景是透明的，这允许命中测试通过它。要使您的 Canvas 注册 HitTests，请为其指定背景颜色。

<Canvas Background="White" ... />

The default background for a Canvas is Transparent, which allows hit tests to pass through it. To make your Canvas register for HitTests, give it a Background Color.