panel menu

gistfile1.js

const St = imports.gi.St;
const Mainloop = imports.mainloop;
const PanelMenu = imports.ui.panelMenu;
const PopupMenu = imports.ui.popupMenu;
const Main = imports.ui.main;
const Tweener = imports.tweener.tweener;

function _showHello() {
    let text = new St.Label({ style_class: 'helloworld-label',
                              text: "Hello, world!" });
    let monitor = global.get_primary_monitor();
    global.stage.add_actor(text);
    text.set_position(Math.floor (monitor.width / 2 - text.width / 2),
                      Math.floor(monitor.height / 2 - text.height / 2));
    Mainloop.timeout_add(3000, function () { text.destroy(); });
}

function _rotateDate() {
    let t = Main.panel._dateMenu.actor;
    Tweener.addTween(t,
                      { time: 2.0,
                        rotation_angle_z: t.rotation_angle_z+360
                      });
}

function HelloPanelButton() {
    this._init();
}

HelloPanelButton.prototype = {
    __proto__: PanelMenu.Button.prototype,

    _init: function() {
        PanelMenu.Button.prototype._init.call(this, 0.0);
        let btn = new St.Label({text: 'hello'});
        this.actor.set_child(btn);
        
        let box = new St.BoxLayout({vertical: true});
        this.menu.addActor(box);
        
        let item = new PopupMenu.PopupMenuItem('hello');
        item.connect('activate', _showHello);
        box.add(item.actor);
        
        item = new PopupMenu.PopupMenuItem('rotate');
        item.connect('activate', _rotateDate);
        box.add(item.actor);
    },
};

function main() {
    let hbtn = new HelloPanelButton();
    Main.panel._leftBox.add(hbtn.actor);
}