在一个ContainerControlÇ检测鼠标的位置＃.NET

问题描述

我测试了以下code：

I am testing the following code:

protected override void OnMouseMove(MouseEventArgs e)
{
    base.OnMouseMove(e);
    Rectangle leftRect = new Rectangle(0, 0, 32, this.Height);
    if (leftRect.Contains(e.Location))
    {
        MessageBox.Show("Hello World");
    }
}

我们的想法是，当鼠标进入某个区域32个像素宽，容器控件的左边，出现一则消息（OK，在R / L就会去做别的事情，但是这纯粹是测试目前如此）。

The idea is that when the mouse enters a region 32 pixels wide, to the left of the container control, a message appears (OK, in R/L it will do something else, but this is purely testing for now).

的问题是，当一个孩子控制填充矩形区域中，一个ContainerControl不接收MouseMove事件，因为它正在由子控制处理

The issue is that when a child control populates the rectangle region, the ContainerControl does not receive the MouseMove event, as it is being handled by the child control.

所以我的问题是，如何让我的一个ContainerControl接收MouseMove事件，即使它的子填充相同的矩形区域？

So my question is, how to I get my ContainerControl to receive the MouseMove event, even when its children populate the same rectangle region?

推荐答案

WPF是很多，在这样的事情更好。我用这样的函数有很多：

WPF is a lot better at this sort of thing. I use a function like this a lot :

public static List<Control> GetAllControlsRecurs(List<Control> list,
                                                 Control parent)
{
    if (parent == null)
        return list;
    else
    {
        list.Add(parent);
    }
    foreach (Control child in parent.Controls)
    {
        GetAllControlsRecurs(list, child);
    }
    return list;
}

这将返回所有子控件和他们的孩子，等名单，给定父控件中。然后，你可以这样做：

This returns a list of all child controls and their children, etc, within a given parent control. You could then do something like :

private void Form1_Load(object sender, EventArgs e)
{
    List<Control> ctlList = new List<Control>();
    GetAllControlsRecurs(ctlList, this);
    foreach (Control ctl in ctlList) ctl.MouseMove += Form1_MouseMove;
}

您将不得不处理与 ControlAdded 动态添加（和删除）的控制，但这至少应该给你一个开始。这里注意，这将不执行code在被覆盖的的OnMouseMove 的方法，而是在表单的的MouseMove 事件处理程序。还有一些其他的解决方案，为建立此成一个派生类，但这里重要的一点是，发现并钩住子控件到单个事件的手段。

You would have to handle dynamically added (and removed) controls with ControlAdded but this should at least give you a start. Note here that this will not execute code in the overriden OnMouseMove method but rather in the form's MouseMove event handler. There are a number of other solutions for building this into a derived class but the important point here is the means of identifying and hooking up child controls to a single event.

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