为 gtk#（单声道）启用键事件处理

Question

以下代码在用户按键时不会触发KeyPress事件...

public class FooWidget : DrawingArea {

    public FooWidget () {
        this.AddEvents ((int)Gdk.EventMask.KeyPressMask);
    }

    [GLib.ConnectBefore]
    protected override bool OnKeyPressEvent (Gdk.EventKey evnt) {
        Console.WriteLine (evnt);
        return base.OnKeyPressEvent (evnt);
    }

}

出了什么问题？

Answer 1

自己找到的：

您需要能够专注于Widget：

this.CanFocus = true;
this.Focus();