Qt中如何使窗口隐藏/最小化到托盘

Qt中如何实现自己的托盘功能，Qt自带的demo也很明了，这里我们就来实现自己的一个托盘。。。

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();

}

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

托盘图标，一个自己脑子出现很久的词，可惜自己都没动手去实现。最近看见的，听见的多了，自己也感兴趣就弄弄了，感觉还蛮简单了。

贴出效果图：

Qt中如何使窗口隐藏/最小化到托盘

那么多功能，其实就一个类就搞定了，那就是QSystemTrayIcon

头文件（主要 1.声明菜单相关动作 2.声明系统托盘对象，以及相关托盘槽函数 3.关闭事件）

[cpp] view plain copy print ?

#ifndef SYSTEMTRAYICON_H
#define SYSTEMTRAYICON_H
#include <QMainWindow>
#include <QMenu>
#include <QSystemTrayIcon>
#include <QCloseEvent>
namespace Ui {
class SystemTrayIcon;
}
class SystemTrayIcon : public QMainWindow
{
Q_OBJECT
public:
explicit SystemTrayIcon(QWidget *parent = 0);
~SystemTrayIcon();
void CreatTrayMenu();
void CreatTrayIcon();
QSystemTrayIcon *myTrayIcon;
QMenu *myMenu;
QAction *miniSizeAction;
QAction *maxSizeAction;
QAction *restoreWinAction;
QAction *quitAction;
private:
Ui::SystemTrayIcon *ui;
public slots:
void iconActivated(QSystemTrayIcon::ActivationReason reason);
protected:
void closeEvent(QCloseEvent *event);
};
#endif // SYSTEMTRAYICON_H

源文件（1.创建上下文菜单 2.创建系统托盘，实现相关功能）---From Qt Assistant

#include <QtGui>

#include "window.h"

Window::Window()

{

createIconGroupBox();

createMessageGroupBox();

iconLabel->setMinimumWidth(durationLabel->sizeHint().width());

createActions();

createTrayIcon();

connect(showMessageButton, SIGNAL(clicked()), this, SLOT(showMessage()));

connect(showIconCheckBox, SIGNAL(toggled(bool)),

trayIcon, SLOT(setVisible(bool)));

connect(iconComboBox, SIGNAL(currentIndexChanged(int)),

this, SLOT(setIcon(int)));

connect(trayIcon, SIGNAL(messageClicked()), this, SLOT(messageClicked()));

connect(trayIcon, SIGNAL(activated(QSystemTrayIcon::ActivationReason)),

this, SLOT(iconActivated(QSystemTrayIcon::ActivationReason)));

QVBoxLayout *mainLayout = new QVBoxLayout;

mainLayout->addWidget(iconGroupBox);

mainLayout->addWidget(messageGroupBox);

setLayout(mainLayout);

iconComboBox->setCurrentIndex(1);

trayIcon->show();

setWindowTitle(tr("Systray"));

resize(400, 300);

}

void Window::setVisible(bool visible)

{

minimizeAction->setEnabled(visible);

maximizeAction->setEnabled(!isMaximized());

restoreAction->setEnabled(isMaximized() || !visible);

QDialog::setVisible(visible);

}

void Window::closeEvent(QCloseEvent *event)

{

if (trayIcon->isVisible()) {

QMessageBox::information(this, tr("Systray"),

tr("The program will keep running in the "

"system tray. To terminate the program, "

"choose <b>Quit</b> in the context menu "

"of the system tray entry."));

hide();

event->ignore();

}

void Window::setIcon(int index)

{

QIcon icon = iconComboBox->itemIcon(index);

trayIcon->setIcon(icon);

setWindowIcon(icon);

trayIcon->setToolTip(iconComboBox->itemText(index));

}

void Window::iconActivated(QSystemTrayIcon::ActivationReason reason)

{

switch (reason) {

case QSystemTrayIcon::Trigger:

case QSystemTrayIcon::DoubleClick:

iconComboBox->setCurrentIndex((iconComboBox->currentIndex() + 1)

% iconComboBox->count());

break;

case QSystemTrayIcon::MiddleClick:

showMessage();

break;

default:

;

}

void Window::showMessage()

{

QSystemTrayIcon::MessageIcon icon = QSystemTrayIcon::MessageIcon(

typeComboBox->itemData(typeComboBox->currentIndex()).toInt());

trayIcon->showMessage(titleEdit->text(), bodyEdit->toPlainText(), icon,

durationSpinBox->value() * 1000);

}

void Window::messageClicked()

{

QMessageBox::information(0, tr("Systray"),

tr("Sorry, I already gave what help I could.\n"

"Maybe you should try asking a human?"));

}

void Window::createIconGroupBox()

{

iconGroupBox = new QGroupBox(tr("Tray Icon"));

iconLabel = new QLabel("Icon:");

iconComboBox = new QComboBox;

iconComboBox->addItem(QIcon(":/images/bad.svg"), tr("Bad"));

iconComboBox->addItem(QIcon(":/images/heart.svg"), tr("Heart"));

iconComboBox->addItem(QIcon(":/images/trash.svg"), tr("Trash"));

showIconCheckBox = new QCheckBox(tr("Show icon"));

showIconCheckBox->setChecked(true);

QHBoxLayout *iconLayout = new QHBoxLayout;

iconLayout->addWidget(iconLabel);

iconLayout->addWidget(iconComboBox);

iconLayout->addStretch();

iconLayout->addWidget(showIconCheckBox);

iconGroupBox->setLayout(iconLayout);

}

void Window::createMessageGroupBox()

{

messageGroupBox = new QGroupBox(tr("Balloon Message"));

typeLabel = new QLabel(tr("Type:"));

typeComboBox = new QComboBox;

typeComboBox->addItem(tr("None"), QSystemTrayIcon::NoIcon);

typeComboBox->addItem(style()->standardIcon(

QStyle::SP_MessageBoxInformation), tr("Information"),

QSystemTrayIcon::Information);

typeComboBox->addItem(style()->standardIcon(

QStyle::SP_MessageBoxWarning), tr("Warning"),

QSystemTrayIcon::Warning);

typeComboBox->addItem(style()->standardIcon(

QStyle::SP_MessageBoxCritical), tr("Critical"),

QSystemTrayIcon::Critical);

typeComboBox->setCurrentIndex(1);

durationLabel = new QLabel(tr("Duration:"));

durationSpinBox = new QSpinBox;

durationSpinBox->setRange(5, 60);

durationSpinBox->setSuffix(" s");

durationSpinBox->setValue(15);

durationWarningLabel = new QLabel(tr("(some systems might ignore this "

"hint)"));

durationWarningLabel->setIndent(10);

titleLabel = new QLabel(tr("Title:"));

titleEdit = new QLineEdit(tr("Cannot connect to network"));

bodyLabel = new QLabel(tr("Body:"));

bodyEdit = new QTextEdit;

bodyEdit->setPlainText(tr("Don't believe me. Honestly, I don't have a "

"clue.\nClick this balloon for details."));

showMessageButton = new QPushButton(tr("Show Message"));

showMessageButton->setDefault(true);

QGridLayout *messageLayout = new QGridLayout;

messageLayout->addWidget(typeLabel, 0, 0);

messageLayout->addWidget(typeComboBox, 0, 1, 1, 2);

messageLayout->addWidget(durationLabel, 1, 0);

messageLayout->addWidget(durationSpinBox, 1, 1);

messageLayout->addWidget(durationWarningLabel, 1, 2, 1, 3);

messageLayout->addWidget(titleLabel, 2, 0);

messageLayout->addWidget(titleEdit, 2, 1, 1, 4);

messageLayout->addWidget(bodyLabel, 3, 0);

messageLayout->addWidget(bodyEdit, 3, 1, 2, 4);

messageLayout->addWidget(showMessageButton, 5, 4);

messageLayout->setColumnStretch(3, 1);

messageLayout->setRowStretch(4, 1);

messageGroupBox->setLayout(messageLayout);

}

void Window::createActions()

{

minimizeAction = new QAction(tr("Mi&nimize"), this);

connect(minimizeAction, SIGNAL(triggered()), this, SLOT(hide()));

maximizeAction = new QAction(tr("Ma&ximize"), this);

connect(maximizeAction, SIGNAL(triggered()), this, SLOT(showMaximized()));

restoreAction = new QAction(tr("&Restore"), this);

connect(restoreAction, SIGNAL(triggered()), this, SLOT(showNormal()));

quitAction = new QAction(tr("&Quit"), this);

connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

}

void Window::createTrayIcon()

{

trayIconMenu = new QMenu(this);

trayIconMenu->addAction(minimizeAction);

trayIconMenu->addAction(maximizeAction);

trayIconMenu->addAction(restoreAction);

trayIconMenu->addSeparator();//添加隔离符

trayIconMenu->addAction(quitAction);

trayIcon = new QSystemTrayIcon(this);

trayIcon->setContextMenu(trayIconMenu);

}

转：http://blog.sina.com.cn/s/blog_a6fb6cc90101dddb.html

http://blog.csdn.net/qivan/article/details/7506306

另可参考：http://www.cnblogs.com/csuftzzk/archive/2013/01/25/2877283.html

http://www.qtcn.org/bbs/simple/?t15361.html

http://blog.csdn.net/learningstone/article/details/7932363

http://hi.baidu.com/sdink/item/85fa00d09864e01ed90e449a

Qt中如何使窗口隐藏/最小化到托盘

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