4.12 实例：最小化到系统托盘.txt

qt的源代码

#ifndef WINDOW_H
#define WINDOW_H
#include <QSystemTrayIcon>
#include <QWidget>
class QAction;
class QCheckBox;
class QComboBox;
class QGroupBox;
class QLabel;
class QLineEdit;
class QMenu;
class QPushButton;
class QSpinBox;
class QTextEdit;
class Window:public QWidget
{
Q_OBJECT
public:
Window();
void setVisible(bool visible);
protected:
void closeEvent(QCloseEvent *event);
Private slots:
voidsetIcon(int index);
void iconActivated(QSystemTrayIcon::ActivationReason reason);
void showMessage();
void messageClicked();
private:
    void createIconGroupBox();
    void createMessageGroupBox();
    void createActions();
    void createTrayIcon();
    QGroupBox *iconGroupBox;
    QLabel *iconLabel;
    QComboBox *iconComboBox;
    QCheckBox *showIconCheckBox;
    QGroupBox *messageGroupBox;
    QLabel *typeLabel;
    QLabel *durationLabel;
    QLabel *durationWarningLabel;
    QLabel *titleLabel;
    QLabel *bodyLabel;
    QComboBox *typeComboBox;
    QSpinBox *durationSpinBox;
    QLineEdit *titleEdit;
    QTextEdit *bodyEdit;
    QPushButton *showMessageButton;
    QAction *minimizeAction;
    QAction *maximizeAction;
    QAction *restoreAction;
QAction *quitAction;
QSystemTrayIcon*trayIcon;
QMenu *trayIconMenu;
};
#endif
#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);
    QWidget::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 "
                                    "that pops up when clicking this program's "
                                    "entry in the system tray."));
        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();
    trayIconMenu->addAction(quitAction);
    trayIcon = new QSystemTrayIcon(this);
trayIcon->setContextMenu(trayIconMenu);
}
#include <QtGui>
#include "window.h"
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    if (!QSystemTrayIcon::isSystemTrayAvailable()) {
        QMessageBox::critical(0, QObject::tr("Systray"),
                              QObject::tr("I couldn't detect any system tray "
                                          "on this system."));
        return 1;
    }
    Window window;
    window.show();
    return app.exec();
}