鼠标捕获失败？ [英] Mouse capture is failing?

问题描述

无论光标是否在应用程序窗口上方，我都希望能够访问鼠标的坐标。

I want to be able to access the coordinates of the mouse whether or not the cursor is over the window of my application.

当我使用Mouse.Capture（ IInputElement）或UIElement.CaptureMouse（）都无法捕获鼠标并返回false。

When I use Mouse.Capture(IInputElement) or UIElement.CaptureMouse(), both fail to capture the mouse and return false.

我的问题是什么？

我窗口的cs文件如下：

The cs file for my window is as follows:

using System.Windows;
using System.Windows.Input;

namespace ScreenLooker
{
    /// <summary>
    /// Interaction logic for Window1.xaml
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();

            bool bSuccess = Mouse.Capture(this);
            bSuccess = this.CaptureMouse();
        }

        protected override void OnMouseMove(MouseEventArgs e)
        {
            tbCoordX.Text = e.GetPosition(this).X.ToString();
            tbCoordY.Text = e.GetPosition(this).Y.ToString();
            //System.Drawing.Point oPoint = System.Windows.Forms.Cursor.Position;
            //tbCoordX.Text = oPoint.X.ToString();
            //tbCoordY.Text = oPoint.Y.ToString();

            base.OnMouseMove(e);
        }
    }
}

推荐答案

传递给 Mouse.Capture（）的控件需要可见和启用。

尝试将Mouse.Capture放入 Loaded 事件处理程序中，例如

Try putting the Mouse.Capture in the Loaded event handler, e.g.

在XAML中：

<Window ... .. .. Title="My Window" loaded="Window_Loaded">
...
</Window>

在代码中：

private void Window_Loaded(object sender, RoutedEventArgs e)
{
  var b = Mouse.Capture(this);
}

我以前没有捕获整个窗口，所以不确定如何将工作。

I've not captured the whole window before, so not sure about how it will work. The typical usage of it is.

1. MouseDown：-调用 Mouse.Capture（）在子控件上


2. MouseMove：-处理鼠标的X和Y坐标


3. MouseUp：-调用 Mouse.Capture（ null）清除鼠标事件捕获。

1. MouseDown:- call Mouse.Capture() on child control
2. MouseMove:- Process X and Y coords of mouse
3. MouseUp:- call Mouse.Capture(null) to clear mouse event capture.

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