NSStatusBarButton.Activate 事件不会触发 (Xamarin.Mac - C#)

问题描述

我正在尝试订阅 Activate 的 NsstatusBarButton 中 AppDelegate 对象的 DidFinishLaunching() 事件，但该事件从未被调用。

目的是在应用程序的顶部菜单栏图标被点击时得到通知，以便其内容可以动态填充。

using AppKit;
using Foundation;

[Register("AppDelegate")]
public class AppDelegate : NSApplicationDelegate
{
    private NsstatusItem _statusBar;

    public override void DidFinishLaunching(NSNotification notification)
    {
        this._statusBar = NsstatusBar.SystemStatusBar.CreateStatusItem(NsstatusItemLength.Variable);
        this._statusBar.Title = "MyApp";
        this._statusBar.Highlightmode = true;
        this._statusBar.Menu = new NSMenu("MyApp");

        // Working example on NSMenuItem object
        var someItem = new NSMenuItem("Some Item");
        someItem.Activated += (sender,e) =>
        {
            System.Diagnostics.Debug.WriteLine("This one does fire.");
        };
        this._statusBar.Menu.AddItem(someItem);

        // Problem
        this._statusBar.Button.Activated += (sender,e) =>
        {
            System.Diagnostics.Debug.WriteLine("This one does not fire.");
        };
    }
}

解决方法

它不会触发，因为您附加了菜单。按钮动作弹出菜单，按钮的激活事件永远不会被触发。如果删除菜单，按钮事件将运行。

要么删除菜单并将其用作按钮。然后你的事件将被触发。或者直接使用菜单。

如果要在显示菜单时运行自定义代码，请设置 NSMenu 的委托：

using AppKit;
using Foundation;

public class MyMenuDelegate : NSObject,INSMenuDelegate
{
    public void MenuWillHighlightItem(NSMenu menu,NSMenuItem item)
    {
                
    }

    [Export("menuWillOpen:")]
    public void MenuWillOpen(NSMenu menu)
    {
       // your code here         
    }
}

[Register("AppDelegate")]
public class AppDelegate : NSApplicationDelegate
{
    private NSStatusItem _statusBar;
    MyMenuDelegate _menuDel;
    public override void DidFinishLaunching(NSNotification notification)
    {
        _statusBar = NSStatusBar.SystemStatusBar.CreateStatusItem(NSStatusItemLength.Variable);
        _statusBar.Title = "MyApp";
        _statusBar.HighlightMode = true;
        _statusBar.Menu = new NSMenu("MyApp");

        _menuDel = new MyMenuDelegate();
        _statusBar.Menu.Delegate = _menuDel;

        // Working example on NSMenuItem object
        var someItem = new NSMenuItem("Some Item");
        someItem.Activated += (sender,e) =>
        {
            System.Diagnostics.Debug.WriteLine("This one does fire.");
        };
        _statusBar.Menu.AddItem(someItem);           
    }
}