QT自定义菜单（仿音乐播放器托盘菜单）

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void SystemTray::createPlayAction()
{
	// 菜单总控件
	play_widget = new QWidget();
	play_widget_action = new QWidgetAction(pop_menu);
	
	play_button = new QPushButton();
	backward_button = new QPushButton();
	forward_button = new QPushButton();
	
	// 正在播放的音乐名字
	music_name_label = new QLabel();
	music_name_label->setFixedWidth(MUSIC_NAME_WIDTH);
	music_name_label->setAlignment(Qt::AlignCenter);
	music_name_label->setText('player');
	music_name_label->setEnabled(false);
	
	// 暂停按钮
	QPixmap play_pixmap(':/action/pause');
	play_button->setIcon(play_pixmap);
	play_button->setIconSize(play_pixmap.size());
	play_button->setObjectName('transparentButton');
	
	// 上一曲按钮
	QPixmap backward_pixmap(':/action/backward');
	backward_button->setIcon(backward_pixmap);
	backward_button->setIconSize(backward_pixmap.size());
	backward_button->setObjectName('transparentButton');
	
	// 下一曲按钮
	QPixmap forward_pixmap(':/action/forward');
	forward_button->setIcon(forward_pixmap);
	forward_button->setIconSize(forward_pixmap.size());
	forward_button->setObjectName('transparentButton');
	
	// 设置鼠标
	backward_button->setCursor(Qt::PointingHandCursor);
	play_button->setCursor(Qt::PointingHandCursor);
	forward_button->setCursor(Qt::PointingHandCursor);
	
	// 播放控件布局（横向）
	QHBoxLayout *layout = new QHBoxLayout();
	layout->addWidget(backward_button);
	layout->addWidget(play_button);
	layout->addWidget(forward_button);
	layout->setSpacing(0);
	layout->setContentsMargins(20, 0, 20, 0);
	
	// 总体布局（纵向）
	QVBoxLayout *layout2 = new QVBoxLayout();
	layout2->addLayout(layout);
	layout2->addWidget(music_name_label, 0, Qt::AlignCenter);
	layout2->setSpacing(5);
	layout2->setContentsMargins(0, 0, 0, 5);
	
	play_widget->setLayout(layout2);
	play_widget_action->setDefaultWidget(play_widget);
	
	connect(play_button, &QPushButton::clicked, this, &SystemTray::play);
	connect(backward_button, &QPushButton::clicked, this, &SystemTray::skipBackward);
	connect(forward_button, &QPushButton::clicked, this, &SystemTray::skipForward);
}