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qsystemtrayicon.cpp

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**
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**
** This file is part of the QtGui module of the Qt Toolkit.
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#include "qsystemtrayicon.h"
#include "qsystemtrayicon_p.h"

#ifndef QT_NO_SYSTEMTRAYICON

#include "qmenu.h"
#include "qevent.h"
#include "qpoint.h"
#include "qlabel.h"
#include "qpushbutton.h"
#include "qpainterpath.h"
#include "qpainter.h"
#include "qstyle.h"
#include "qgridlayout.h"
#include "qapplication.h"
#include "qdesktopwidget.h"
#include "qbitmap.h"

/*!
    \class QSystemTrayIcon
    \brief The QSystemTrayIcon class provides an icon for an application in the system tray.
    \since 4.2
    \ingroup application
    \ingroup desktop

    Modern operating systems usually provide a special area on the desktop,
    called the \e{system tray} or \e{notification area}, where long-running
    applications can display icons and short messages.

    \image system-tray.png The system tray on Windows XP.

    The QSystemTrayIcon class can be used on the following platforms:

    \list
    \o All supported versions of Windows.
    \o All window managers for X11 that implement the \l{freedesktop.org} system
       tray specification, including recent versions of KDE and GNOME.
    \o Mac OS X, with the exception of showMessage()
    \endlist

    To check whether a system tray is present on the user's desktop,
    call the QSystemTrayIcon::isSystemTrayAvailable() static function.

    To add a system tray entry, create a QSystemTrayIcon object, call setContextMenu()
    to provide a context menu for the icon, and call show() to make it visible in the
    system tray. Status notification messages ("balloon messages") can be displayed at
    any time using showMessage().

    If the system tray is unavailable when a system tray icon is constructed, but
    becomes available later, QSystemTrayIcon will automatically add an entry for the
    application in the system tray if the icon is \l visible.

    The activated() signal is emitted when the user activates the icon.

    Only on X11 when a tooltip is requested the QSystemTrayIcon receives a QHelpEvent
    of type QEvent::ToolTip. This is not supported on any other platform.

    \sa QDesktopServices, QDesktopWidget, {Desktop Integration}
*/

/*!
    \enum QSystemTrayIcon::MessageIcon

    This enum describes the icon that is shown when a balloon message is displayed.

    \value NoIcon      No icon is shown.
    \value Information An information icon is shown.
    \value Warning     A standard warning icon is shown.
    \value Critical    A critical warning icon is shown.

    \sa QMessageBox
*/

/*!
    Constructs a QSystemTrayIcon object with the given \a parent.

    The icon is initially invisible.

    \sa visible
*/
00104 QSystemTrayIcon::QSystemTrayIcon(QObject *parent)
: QObject(*new QSystemTrayIconPrivate(), parent)
{
}

/*!
    Constructs a QSystemTrayIcon object with the given \a icon and \a parent.

    The icon is initially invisible.

    \sa visible
*/
00116 QSystemTrayIcon::QSystemTrayIcon(const QIcon &icon, QObject *parent)
: QObject(*new QSystemTrayIconPrivate(), parent)
{
    setIcon(icon);
}

/*!
    Removes the icon from the system tray and frees all allocated resources.
*/
00125 QSystemTrayIcon::~QSystemTrayIcon()
{
    Q_D(QSystemTrayIcon);
    d->remove_sys();
}

#ifndef QT_NO_MENU

/*!
    Sets the specified \a menu to be the context menu for the system tray icon.

    The menu will pop up when the user requests the context menu for the system
    tray icon by clicking the mouse button.

    On Mac OS X, this is currenly converted to a NSMenu, so the
    aboutToHide() signal is not emitted.
*/
00142 void QSystemTrayIcon::setContextMenu(QMenu *menu)
{
    Q_D(QSystemTrayIcon);
    d->menu = menu;
    d->updateMenu_sys();
}

/*!
    Returns the current context menu for the system tray entry.
*/
00152 QMenu* QSystemTrayIcon::contextMenu() const
{
    Q_D(const QSystemTrayIcon);
    return d->menu;
}

#endif // QT_NO_MENU

/*!
    \property QSystemTrayIcon::icon
    \brief the system tray icon

    On Windows, the system tray icon size is 16x16; on X11, the preferred size is
    22x22. The icon will be scaled to the appropriate size as necessary.

    On X11, due to a limitation in the system tray specification, mouse clicks
    on transparent areas in the icon are propagated to the system tray. If this
    behavior is unacceptable, we suggest using an icon with no transparency.
*/
void QSystemTrayIcon::setIcon(const QIcon &icon)
{
    Q_D(QSystemTrayIcon);
    d->icon = icon;
    d->updateIcon_sys();
}

QIcon QSystemTrayIcon::icon() const
{
    Q_D(const QSystemTrayIcon);
    return d->icon;
}

/*!
    \property QSystemTrayIcon::toolTip
    \brief the tooltip for the system tray entry

    On some systems, the tooltip's length is limited. The tooltip will be truncated
    if necessary.
*/
void QSystemTrayIcon::setToolTip(const QString &tooltip)
{
    Q_D(QSystemTrayIcon);
    d->toolTip = tooltip;
    d->updateToolTip_sys();
}

QString QSystemTrayIcon::toolTip() const
{
    Q_D(const QSystemTrayIcon);
    return d->toolTip;
}

/*!
    \fn void QSystemTrayIcon::show()

    Shows the icon in the system tray.

    \sa hide(), visible
*/

/*!
    \fn void QSystemTrayIcon::hide()

    Hides the system tray entry.

    \sa show(), visible
*/

#if 0
/*!
  Returns the global position of the system tray icon.

  \sa visible
*/
QPoint QSystemTrayIcon::pos() const
{
    Q_D(const QSystemTrayIcon);
    if (!d->visible)
        return QPoint();
    return d->globalPos_sys();
}
#endif

/*!
    \property QSystemTrayIcon::visible
    \brief whether the system tray entry is visible

    Setting this property to true or calling show() makes the system tray icon
    visible; setting this property to false or calling hide() hides it.
*/
void QSystemTrayIcon::setVisible(bool visible)
{
    Q_D(QSystemTrayIcon);
    if (visible == d->visible)
        return;
    if (d->icon.isNull() && visible)
        qWarning("QSystemTrayIcon::setVisible: No Icon set");
    d->visible = visible;
    if (d->visible)
        d->install_sys();
    else
        d->remove_sys();
}

bool QSystemTrayIcon::isVisible() const
{
    Q_D(const QSystemTrayIcon);
    return d->visible;
}

/*!
  \reimp
*/
00265 bool QSystemTrayIcon::event(QEvent *e)
{
#if defined(Q_WS_X11)
    if (e->type() == QEvent::ToolTip) {
        Q_D(QSystemTrayIcon);
        return d->sys->deliverToolTipEvent(e);
    }
#endif
    return QObject::event(e);
}

/*!
    \enum QSystemTrayIcon::ActivationReason

     This enum describes the reason the system tray was activated.

     \value Unknown     Unknown reason
     \value Context     The context menu for the system tray entry was requested
     \value DoubleClick The system tray entry was double clicked
     \value Trigger     The system tray entry was clicked
     \value MiddleClick The system tray entry was clicked with the middle mouse button

     \sa activated()
*/

/*!
    \fn void QSystemTrayIcon::activated(QSystemTrayIcon::ActivationReason reason)

    This signal is emitted when the user activates the system tray icon. \a reason
    specifies the reason for activation. QSystemTrayIcon::ActivationReason enumerates
    the various reasons.

    \sa QSystemTrayIcon::ActivationReason
*/

/*!
    \fn void QSystemTrayIcon::messageClicked()

    This signal is emitted when the message displayed using showMessage()
    was clicked by the user.

    \sa activated()
*/


/*!
    Returns true if the system tray is available; otherwise returns false.

    If the system tray is currently unavailable but becomes available later,
    QSystemTrayIcon will automatically add an entry in the system tray if it
    is \l visible.
*/

00318 bool QSystemTrayIcon::isSystemTrayAvailable()
{
    return QSystemTrayIconPrivate::isSystemTrayAvailable_sys();
}

/*!
    Returns true if the system tray supports balloon messages; otherwise returns false.

    Mac OS X does not support ballon messages currently.

    \sa showMessage()
*/
00330 bool QSystemTrayIcon::supportsMessages()
{
#if defined(Q_WS_MAC) || defined(Q_WS_QWS)
    return false;
#endif
    return true;
}

/*!
    \fn void QSystemTrayIcon::showMessage(const QString &title, const QString &message, MessageIcon icon, int milliseconds)

    Shows a balloon message for the entry with the given \a title, \a message and
    \a icon for the time specified in \a milliseconds.

    Message can be clicked by the user; the messageClicked() signal will emitted when
    this occurs.

    Note that display of messages are dependent on the system configuration and user
    preferences, and that messages may not appear at all. Hence, it should not be
    relied upon as the sole means for providing critical information.

    \sa show() supportsMessages()
  */
00353 void QSystemTrayIcon::showMessage(const QString& title, const QString& msg,
                            QSystemTrayIcon::MessageIcon icon, int msecs)
{
    Q_D(QSystemTrayIcon);
    if (d->visible)
        d->showMessage_sys(title, msg, icon, msecs);
}

//////////////////////////////////////////////////////////////////////
static QBalloonTip *theSolitaryBalloonTip = 0;

void QBalloonTip::showBalloon(QSystemTrayIcon::MessageIcon icon, const QString& title,
                              const QString& message, QSystemTrayIcon *trayIcon,
                              const QPoint& pos, int timeout, bool showArrow)
{
    hideBalloon();
    theSolitaryBalloonTip = new QBalloonTip(icon, title, message, trayIcon);
    if (timeout < 0)
        timeout = 10000; //10 s default
    theSolitaryBalloonTip->balloon(pos, timeout, showArrow);
}

void QBalloonTip::hideBalloon()
{
    if (!theSolitaryBalloonTip)
        return;
    theSolitaryBalloonTip->hide();
    delete theSolitaryBalloonTip;
    theSolitaryBalloonTip = 0;
}

QBalloonTip::QBalloonTip(QSystemTrayIcon::MessageIcon icon, const QString& title,
                         const QString& message, QSystemTrayIcon *ti)
    : QWidget(0, Qt::ToolTip), trayIcon(ti), timerId(-1)
{
    setAttribute(Qt::WA_DeleteOnClose);
    QObject::connect(ti, SIGNAL(destroyed()), this, SLOT(close()));

    QLabel *titleLabel = new QLabel;
    titleLabel->installEventFilter(this);
    titleLabel->setText(title);
    QFont f = titleLabel->font();
    f.setBold(true);
    titleLabel->setFont(f);
    titleLabel->setTextFormat(Qt::PlainText); // to maintain compat with windows

    QPushButton *closeButton = new QPushButton;
    closeButton->setIcon(style()->standardIcon(QStyle::SP_DockWidgetCloseButton));
    closeButton->setIconSize(QSize(18, 18));
    closeButton->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
    closeButton->setFixedSize(18, 18);
    QObject::connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));

    QLabel *msgLabel = new QLabel;
    msgLabel->installEventFilter(this);
    msgLabel->setText(message);
    msgLabel->setTextFormat(Qt::PlainText);
    msgLabel->setAlignment(Qt::AlignTop | Qt::AlignLeft);

    QIcon si;
    switch (icon) {
    case QSystemTrayIcon::Warning:
        si = style()->standardIcon(QStyle::SP_MessageBoxWarning);
        break;
    case QSystemTrayIcon::Critical:
      si = style()->standardIcon(QStyle::SP_MessageBoxCritical);
        break;
    case QSystemTrayIcon::Information:
      si = style()->standardIcon(QStyle::SP_MessageBoxInformation);
        break;
    case QSystemTrayIcon::NoIcon:
    default:
        break;
    }

    QGridLayout *layout = new QGridLayout;
    if (!si.isNull()) {
        QLabel *iconLabel = new QLabel;
        iconLabel->setPixmap(si.pixmap(15, 15));
        iconLabel->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
        iconLabel->setMargin(2);
        layout->addWidget(iconLabel, 0, 0);
      layout->addWidget(titleLabel, 0, 1);
    } else {
      layout->addWidget(titleLabel, 0, 0, 1, 2);
    }

    layout->addWidget(closeButton, 0, 2);
    layout->addWidget(msgLabel, 1, 0, 1, 3);
    layout->setSizeConstraint(QLayout::SetFixedSize);
    layout->setMargin(3);
    layout->setSpacing(1);
    setLayout(layout);

    QPalette pal = palette();
    pal.setColor(QPalette::Window, QColor(0xff, 0xff, 0xe1));
    setPalette(pal);
}

QBalloonTip::~QBalloonTip()
{
    theSolitaryBalloonTip = 0;
}

void QBalloonTip::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    painter.drawPixmap(rect(), pixmap);
}

void QBalloonTip::resizeEvent(QResizeEvent *ev)
{
    QWidget::resizeEvent(ev);
}

void QBalloonTip::balloon(const QPoint& pos, int msecs, bool showArrow)
{
    QRect scr = QApplication::desktop()->screenGeometry(pos);
    QSize sh = sizeHint();
    const int border = 1;
    const int ah = 18, ao = 18, aw = 18, rc = 7;
    bool arrowAtTop = (pos.y() + sh.height() + ah < scr.height());
    bool arrowAtLeft = (pos.x() + sh.width() - ao < scr.width());
    setContentsMargins(border + 3,  border + (arrowAtTop ? ah : 0) + 2, border + 3, border + (arrowAtTop ? 0 : ah) + 2);
    updateGeometry();
    sh  = sizeHint();

    int ml, mr, mt, mb;
    QSize sz = sizeHint();
    if (!arrowAtTop) {
        ml = mt = 0;
        mr = sz.width() - 1;
        mb = sz.height() - ah - 1;
    } else {
        ml = 0;
        mt = ah;
        mr = sz.width() - 1;
        mb = sz.height() - 1;
    }

    QPainterPath path;
    path.moveTo(ml + rc, mt);
    if (arrowAtTop && arrowAtLeft) {
        if (showArrow) {
            path.lineTo(ml + ao, mt);
            path.lineTo(ml + ao, mt - ah);
            path.lineTo(ml + ao + aw, mt);
        }
        move(qMax(pos.x() - ao, scr.left() + 2), pos.y());
    } else if (arrowAtTop && !arrowAtLeft) {
        if (showArrow) {
            path.lineTo(mr - ao - aw, mt);
            path.lineTo(mr - ao, mt - ah);
            path.lineTo(mr - ao, mt);
        }
        move(qMin(pos.x() - sh.width() + ao, scr.right() - sh.width() - 2), pos.y());
    }
    path.lineTo(mr - rc, mt);
    path.arcTo(QRect(mr - rc*2, mt, rc*2, rc*2), 90, -90);
    path.lineTo(mr, mb - rc);
    path.arcTo(QRect(mr - rc*2, mb - rc*2, rc*2, rc*2), 0, -90);
    if (!arrowAtTop && !arrowAtLeft) {
        if (showArrow) {
            path.lineTo(mr - ao, mb);
            path.lineTo(mr - ao, mb + ah);
            path.lineTo(mr - ao - aw, mb);
        }
        move(qMin(pos.x() - sh.width() + ao, scr.right() - sh.width() - 2),
             pos.y() - sh.height());
    } else if (!arrowAtTop && arrowAtLeft) {
        if (showArrow) {
            path.lineTo(ao + aw, mb);
            path.lineTo(ao, mb + ah);
            path.lineTo(ao, mb);
        }
        move(qMax(pos.x() - ao, scr.x() + 2), pos.y() - sh.height());
    }
    path.lineTo(ml + rc, mb);
    path.arcTo(QRect(ml, mb - rc*2, rc*2, rc*2), -90, -90);
    path.lineTo(ml, mt + rc);
    path.arcTo(QRect(ml, mt, rc*2, rc*2), 180, -90);

    // Set the mask
    QBitmap bitmap = QBitmap(sizeHint());
    bitmap.fill(Qt::color0);
    QPainter painter1(&bitmap);
    painter1.setPen(QPen(Qt::color1, border));
    painter1.setBrush(QBrush(Qt::color1));
    painter1.drawPath(path);
    setMask(bitmap);

    // Draw the border
    pixmap = QPixmap(sz);
    QPainter painter2(&pixmap);
    painter2.setPen(QPen(Qt::black, border));
    painter2.setBrush(palette().color(QPalette::Window));
    painter2.drawPath(path);

    if (msecs > 0)
        timerId = startTimer(msecs);
    show();
}

void QBalloonTip::mousePressEvent(QMouseEvent *e)
{
    close();
    if(e->button() == Qt::LeftButton)
        emit trayIcon->messageClicked();
}

void QBalloonTip::timerEvent(QTimerEvent *e)
{
    if (e->timerId() == timerId) {
        killTimer(timerId);
        if (!underMouse())
            close();
        return;
    }
    QWidget::timerEvent(e);
}

void qtsystray_sendActivated(QSystemTrayIcon *i, int r)
{
    emit i->activated((QSystemTrayIcon::ActivationReason)r);
}

#endif // QT_NO_SYSTEMTRAYICON

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