c# - 实现快捷方式编辑器文本框的最佳方法是什么？

Question

我想要做的是实现一个 TextBox ，它接受组合键作为输入。例如，按下这些键(Windows 窗体或 WPF)时会出现文本 Win + Ctrl + A。

一个很好的例子是 Winamp 设置中的“全局热键”下。

Answer 1

您可以通过以下方式检测几乎所有按下的按键: 来源:How to detect the currently pressed key?

private KeyMessageFilter m_filter = new KeyMessageFilter();

private void Form1_Load(object sender, EventArgs e)
{
    Application.AddMessageFilter(m_filter);

}


public class KeyMessageFilter : IMessageFilter
{
    private Dictionary<Keys, bool> m_keyTable = new Dictionary<Keys, bool>();

    public Dictionary<Keys, bool> KeyTable
    {
        get { return m_keyTable; }
        private set { m_keyTable = value; }
    }

    public bool IsKeyPressed()
    {
        return m_keyPressed; 
    }

    public bool IsKeyPressed(Keys k)
    {
        bool pressed = false;

        if (KeyTable.TryGetValue(k, out pressed))
        {
            return pressed;                  
        }

        return false; 
    }

    private const int WM_KEYDOWN = 0x0100;

    private const int WM_KEYUP = 0x0101;

    private bool m_keyPressed = false;


    public bool PreFilterMessage(ref Message m)
    {
        if (m.Msg == WM_KEYDOWN)
        {
            KeyTable[(Keys)m.WParam] = true;

            m_keyPressed = true;
        }

        if (m.Msg == WM_KEYUP)
        {                
            KeyTable[(Keys)m.WParam] = false;

            m_keyPressed = false;
        }

        return false;
    }
}