如何prevent用户控件的形式在C＃处理键盘输入（箭头键） [英] How to prevent usercontrol form handling keyboard input (arrow keys) in c#

问题描述

我的用户包含可以选择其他控件，我想实现导航了子控件与方向键的方式

my usercontrol contains other controls that can be selected, i would like to implement way of navigating over child controls with arrow keys

问题是，父母控制研究拦截箭头键，并用它来滚动视图什么是我想要避免的事情。我想解决在导航控制内容由我自己。

The problem is that parent controll intercepts arrow keys and use it to scroll its view what is the thing i want to avoid. I want to solve navigating over contents of control by myself.

我怎么能采取控制标准的行为是由方向键？

How i can take control over standard behaviour that is caused by arrow keys?

在此先感谢 MTH

推荐答案

这通常是通过重写IsInputKey（）方法来告诉你想要这些键来完成。然而，这不会对用户控件工作，它从来没有得到的焦点，使的onkeydown方法永远不会运行。相反，覆盖给ProcessCmdKey（）方法，在窗体看到击键之前调用。像这样的：

This is normally done by overriding IsInputKey() method to tell that you want these keys. That however won't work for a UserControl, it never gets the focus so the OnKeyDown method never runs. Instead, override the ProcessCmdKey() method, it is called before the form sees the keystroke. Like this:

    protected override bool ProcessCmdKey(ref Message msg, Keys keyData) {
        switch (keyData) {
            case Keys.Left: MessageBox.Show("Left!"); break;
            case Keys.Right: MessageBox.Show("Right!"); break;
            default: return base.ProcessCmdKey(ref msg, keyData);
        }
        return true;  // used
    }

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