🚀 go-pugleaf

It turned out to be not too difficult to implement the openlook type of
mouse menu button behavior. I am not sure, though, if it is important to
keep track of whether the events are grabbed.

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class PopupMenu : public Handler {
public:
	PopupMenu();
	virtual ~PopupMenu();
	virtual boolean event(Event&);
	void append_item(MenuItem*);
private:
	Menu* menu_;
	PopupWindow* w_;
	boolean grabbed_;
};

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PopupMenu::PopupMenu() {
	menu_ = WidgetKit::instance()->pulldown();
	w_ = nil;
	grabbed_ = false;
}

PopupMenu::~PopupMenu() {
	Resource::unref(menu_);
	if (w_) {
		delete w_;
	}
}

boolean PopupMenu::event(Event& e) {
	if (!w_) {
		w_ = new PopupWindow(menu_);
	}
	switch (e.type()) {
	case Event::down:
		w_->place(e.pointer_root_x(), e.pointer_root_y());
		w_->align(.2,.9);
		w_->map();
		e.grab(this);
		grabbed_ = true;
		menu_->press(e);
		break;
	case Event::motion:
		if (grabbed_) {
			menu_->drag(e);
		}
		break;
	case Event::up:
		if (grabbed_) {
			menu_->release(e);
			w_->unmap();
			e.ungrab(this);
			grabbed_ = false;
		}
		break;
	}
	return true;
}

void PopupMenu::append_item(MenuItem* mi) {
	menu_->append_item(mi);
}