Question

Qt中如何使窗口隐藏/最小化到托盘

Answer 1

功能：窗口最小化后或者点击“hide”按钮将窗口隐藏到托盘。
通常最小化的窗口会在任务栏上显示一个按钮。当用户按一下这个按钮，窗口就还原了。这是一个被大多数桌面环境，比如Windows，KDE，GNOME所采用的普遍设计。不过，因为任务栏通常只是桌面边上一小行，容纳不了很多按钮，用户通常希望把那些不常用的程序隐藏起来，只在通知栏显示一个小图标，要使用的时候再点击那个小图标恢复窗口。这种作法最典型的例子是QQ和Winamp。
最基本的思路是拦截窗口的最小化事件changeEvent(),通过重写changeEvent()即可。

“hide”按钮的方式，是通过信号--槽来实现。
--------------------------------------------------------------------
void TrayMenu::createActions()
{
//创建托盘项
action_show = new QAction(this);
action_quit = new QAction(this);
action_login_home = new QAction(this);
action_help = new QAction(this);
action_about = new QAction(this);
action_check_update = new QAction(this);
action_setting = new QAction(this);

//设置托盘项图标
action_show->setIcon(QIcon(":/icon/open"));
action_login_home->setIcon(QIcon(":/icon/home"));
action_help->setIcon(QIcon(":/icon/help"));
action_about->setIcon(QIcon(":/icon/about"));
action_check_update->setIcon(QIcon(":/icon/update"));
action_setting->setIcon(QIcon(":/icon/set"));
action_quit->setIcon(QIcon(":/icon/quit"));
//加载图片和提示
QIcon icon(":/images/sysTray.png");
systemTray = new QSystemTrayIcon(this);
systemTray->setIcon(icon);
systemTray->setToolTip("Hello, this is system tray!");

注意：这里特别提醒，如果你的应用程序要移植到别的机器上，而且这个机器没有装Qt，QIcon的图片格式最好用png，而不要用ico等格式，否则托盘图标不能显示，会很麻烦。

//设置托盘想文本
action_show->setText(QString("显示"));
action_quit->setText(QString("退出"));
action_login_home->setText(QString("登录网页"));
action_help->setText(QString("帮助"));
action_about->setText(QString("关于"));
action_check_update->setText(QString("检查更新"));
action_setting->setText(QString("设置"));

//添加菜单项
this->addAction(action_show);
this->addAction(action_setting);
this->addAction(action_login_home);
this->addSeparator();
this->addAction(action_help);
this->addAction(action_about);
this->addAction(action_check_update);
this->addSeparator();
this->addAction(action_quit);
action_setting->setVisible(false);

//设置信号连接（这里仅列举连接显示窗口的信号）
QObject::connect(action_show, SIGNAL(triggered(bool)), this, SIGNAL(showWidget()));
}

LoginDialog::LoginDialog(QWidget *parent) : QDialog(parent)
{
QSystemTrayIcon *system_tray = new QSystemTrayIcon();
//放在托盘提示信息、托盘图标
system_tray ->setToolTip(QString("我就是托盘"));
system_tray ->setIcon(QIcon(":/icon/login"));
TrayMenu *tray_menu = new TrayMenu();
system_tray->setContextMenu(tray_menu);
//点击托盘执行的事件
connect(system_tray , SIGNAL(activated(QSystemTrayIcon::ActivationReason)), this, SLOT(iconIsActived(QSystemTrayIcon::ActivationReason)));
connect(tray_menu, SIGNAL(showWidget()), this, SLOT(showNormal()));
//显示托盘
system_tray->show();
//托盘显示提示信息
system_tray->showMessage(QString("托盘标题"), QString("托盘显示内容"));
}

void LoginDialog::iconIsActived(QSystemTrayIcon::ActivationReason reason)
{
switch(reason)
{
//点击托盘显示窗口
case QSystemTrayIcon::Trigger:
{
showNormal();
break;
}
//双击托盘显示窗口
case QSystemTrayIcon::DoubleClick:
{
showNormal();
break;
}
default:
break;
}
}

OK，这样我们的托盘功能就Over了！
=============================================================================
另：//关闭到托盘
void Widget::closeEvent(QCloseEvent *e)
{
e->ignore();
this->hide();
}

//最小化到托盘
void Widget::changeEvent(QEvent *e)
{
if((e->type()==QEvent::WindowStateChange)&&this->isMinimized())
{
QTimer::singleShot(100, this, SLOT(close()));
}
}
或者（me）
//点击窗口的“最小化"按钮会调用此函数(系统默认)---已实现
void maxLinksGuard::changeEvent(QEvent * event )
{
if(event->WindowStateChange)
{
switch(this->windowState())
{
//点击“最小化”按钮
case Qt::WindowMinimized:
this->hide();
this->setWindowFlags(Qt::Tool);//隐藏任务栏上图标
systemTray->show();//显示托盘
systemTray->showMessage(windowTitle(),"Here is system,double click will show!");//提示
event->ignore();
break;
default:
break;
}
}
}

//托盘图标事件--------已实现
void maxLinksGuard::iconActivated(QSystemTrayIcon::ActivationReason reason)
{
switch (reason)
{
//单击托盘
case QSystemTrayIcon::Trigger:
{
if(!this->isVisible())
{
this->setWindowFlags(Qt::Window); //显示之前恢复
showNormal();
}
else
{
hide();
}
break;
}
//双击托盘---貌似不起作用
case QSystemTrayIcon::DoubleClick:
{
if(!this->isVisible())
{
this->setWindowFlags(Qt::Window); //显示之前恢复
showNormal();
}
else
{
hide();
}
break;
}
case QSystemTrayIcon::MiddleClick:
{
break;
}
default: ;
}
}

//点击窗口的“关闭”按钮触发closeEvent事件(关闭应用程序)----已实现
void maxLinksGuard::closeEvent(QCloseEvent *event)
{
if (this->isVisible())
{
QMessageBox::critical(NULL,QObject::tr("Prompt:"),QObject::tr("Are you sure you want to kill/stop the MaxLinksGuard?"));
event->ignore();
}
else
{
event->accept();
}

}

==========================================================