qtabbar.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

void QTabBar::setCurrentIndex(int index)
{
    Q_D(QTabBar);
    if (d->validIndex(index) && d->currentIndex != index) {
        d->currentIndex = index;
        update();
        d->makeVisible(index);
#ifdef QT3_SUPPORT
        emit selected(index);
#endif
        emit currentChanged(index);
    }
}

/*!
    \property QTabBar::iconSize
    \brief The size for icons in the tab bar
    \since 4.1

    The default value is style-dependent.
*/
QSize QTabBar::iconSize() const
{
    Q_D(const QTabBar);
    if (d->iconSize.isValid())
        return d->iconSize;
    int iconExtent = style()->pixelMetric(QStyle::PM_TabBarIconSize);
    return QSize(iconExtent, iconExtent);

}

void QTabBar::setIconSize(const QSize &size)
{
    Q_D(QTabBar);
    d->iconSize = size;
    d->layoutDirty = true;
    update();
    updateGeometry();
}

/*!
    \property QTabBar::count
    \brief the number of tabs in the tab bar
*/

int QTabBar::count() const
{
    Q_D(const QTabBar);
    return d->tabList.count();
}


/*!\reimp
 */
QSize QTabBar::sizeHint() const
{
    Q_D(const QTabBar);
    if (d->layoutDirty)
        const_cast<QTabBarPrivate*>(d)->layoutTabs();
    QRect r;
    for (int i = 0; i < d->tabList.count(); ++i)
        r = r.unite(d->tabList.at(i).rect);
    QSize sz = QApplication::globalStrut();
    return r.size().expandedTo(sz);
}

/*!\reimp
 */
QSize QTabBar::minimumSizeHint() const
{
    Q_D(const QTabBar);
    if (style()->styleHint(QStyle::SH_TabBar_PreferNoArrows, 0, this))
        return sizeHint();
    if (verticalTabs(d->shape))
        return QSize(sizeHint().width(), d->rightB->sizeHint().height() * 2 + 75);
    else
        return QSize(d->rightB->sizeHint().width() * 2 + 75, sizeHint().height());
}

/*!
    Returns the size hint for the tab at position \a index.
*/
QSize QTabBar::tabSizeHint(int index) const
{
    Q_D(const QTabBar);
    if (const QTabBarPrivate::Tab *tab = d->at(index)) {
        QStyleOptionTabV2 opt = d->getStyleOption(index);
        QSize iconSize = tab->icon.isNull() ? QSize() : opt.iconSize;
        int hframe  = style()->pixelMetric(QStyle::PM_TabBarTabHSpace, &opt, this);
        int vframe  = style()->pixelMetric(QStyle::PM_TabBarTabVSpace, &opt, this);
        const QFontMetrics fm = fontMetrics();
        QSize csz(fm.size(Qt::TextShowMnemonic, tab->text).width() + iconSize.width() + hframe,
                  qMax(fm.height(), iconSize.height()) + vframe);
        if (verticalTabs(d->shape))
            csz.transpose();

        return style()->sizeFromContents(QStyle::CT_TabBarTab, &opt, csz, this);
    }
    return QSize();
}

/*!
  This virtual handler is called after a new tab was added or
  inserted at position \a index.

  \sa tabRemoved()
 */
void QTabBar::tabInserted(int index)
{
    Q_UNUSED(index)
}

/*!
  This virtual handler is called after a tab was removed from
  position \a index.

  \sa tabInserted()
 */
void QTabBar::tabRemoved(int index)
{
    Q_UNUSED(index)
}

/*!
  This virtual handler is called whenever the tab layout changes.

  \sa tabRect()
 */
void QTabBar::tabLayoutChange()
{
}


/*!\reimp
 */
void QTabBar::showEvent(QShowEvent *)
{
    Q_D(QTabBar);
    if (d->layoutDirty)
        d->layoutTabs();
    if (!d->validIndex(d->currentIndex))
        setCurrentIndex(0);

}


/*!\reimp
 */
bool QTabBar::event(QEvent *e)
{
    Q_D(QTabBar);
    if (e->type() == QEvent::HoverMove
        || e->type() == QEvent::HoverEnter) {
        QHoverEvent *he = static_cast<QHoverEvent *>(e);
        if (!d->hoverRect.contains(he->pos())) {
            QRect oldHoverRect = d->hoverRect;
            for (int i = 0; i < d->tabList.count(); ++i) {
                QRect area = tabRect(i);
                if (area.contains(he->pos())) {
                    d->hoverRect = area;
                    break;
                }
            }
            if (he->oldPos() != QPoint(-1, -1))
                update(oldHoverRect);
            update(d->hoverRect);
        }
        return true;
    } else if (e->type() == QEvent::HoverLeave ) {
        QRect oldHoverRect = d->hoverRect;
        d->hoverRect = QRect();
        update(oldHoverRect);
        return true;
#ifndef QT_NO_TOOLTIP
    } else if (e->type() == QEvent::ToolTip) {
        if (const QTabBarPrivate::Tab *tab = d->at(d->indexAtPos(static_cast<QHelpEvent*>(e)->pos()))) {
            if (!tab->toolTip.isEmpty()) {
                QToolTip::showText(static_cast<QHelpEvent*>(e)->globalPos(), tab->toolTip, this);
                return true;
            }
        }
#endif // QT_NO_TOOLTIP
#ifndef QT_NO_WHATSTHIS
    } else if (e->type() == QEvent::QueryWhatsThis) {
        const QTabBarPrivate::Tab *tab = d->at(d->indexAtPos(static_cast<QHelpEvent*>(e)->pos()));
        if (!tab || tab->whatsThis.isEmpty())
            e->ignore();
        return true;
    } else if (e->type() == QEvent::WhatsThis) {
        if (const QTabBarPrivate::Tab *tab = d->at(d->indexAtPos(static_cast<QHelpEvent*>(e)->pos()))) {
            if (!tab->whatsThis.isEmpty()) {
                QWhatsThis::showText(static_cast<QHelpEvent*>(e)->globalPos(),
                                     tab->whatsThis, this);
                return true;
            }
        }
#endif // QT_NO_WHATSTHIS
#ifndef QT_NO_SHORTCUT
    } else if (e->type() == QEvent::Shortcut) {
        QShortcutEvent *se = static_cast<QShortcutEvent *>(e);
        for (int i = 0; i < d->tabList.count(); ++i) {
            const QTabBarPrivate::Tab *tab = &d->tabList.at(i);
            if (tab->shortcutId == se->shortcutId()) {
                setCurrentIndex(i);
                return true;
            }
        }
#endif
    }
    return QWidget::event(e);
}

/*!\reimp
 */
void QTabBar::resizeEvent(QResizeEvent *)
{
    Q_D(QTabBar);
    d->layoutTabs();
    d->makeVisible(d->currentIndex);
}

/*!\reimp
 */
void QTabBar::paintEvent(QPaintEvent *)
{
    Q_D(QTabBar);
    QStyleOptionTab tabOverlap;
    tabOverlap.shape = d->shape;
    int overlap = style()->pixelMetric(QStyle::PM_TabBarBaseOverlap, &tabOverlap, this);
    QWidget *theParent = parentWidget();
    QStyleOptionTabBarBase optTabBase;
    optTabBase.init(this);
    optTabBase.shape = d->shape;
    if (theParent && overlap > 0) {
        QPainter::setRedirected(theParent, this, pos());
        QRect rect;
        switch (tabOverlap.shape) {
        case QTabBar::RoundedNorth:
        case QTabBar::TriangularNorth:
            rect.setRect(0, height()-overlap, width(), overlap);
            break;
        case QTabBar::RoundedSouth:
        case QTabBar::TriangularSouth:
            rect.setRect(0, 0, width(), overlap);
            break;
        case QTabBar::RoundedEast:
        case QTabBar::TriangularEast:
            rect.setRect(0, 0, overlap, height());
            break;
        case QTabBar::RoundedWest:
        case QTabBar::TriangularWest:
            rect.setRect(width()-overlap, 0, overlap, height());
            break;
        }
        optTabBase.rect = rect;
        QPaintEvent e(rect);
        QApplication::sendEvent(theParent, &e);
        QPainter::restoreRedirected(theParent);
    }
    QStylePainter p(this);
    int selected = -1;
    int cut = -1;
    bool rtl = optTabBase.direction == Qt::RightToLeft;
    bool verticalTabs = (d->shape == QTabBar::RoundedWest || d->shape == QTabBar::RoundedEast
                         || d->shape == QTabBar::TriangularWest
                         || d->shape == QTabBar::TriangularEast);
    QStyleOptionTab cutTab;
    QStyleOptionTab selectedTab;
    for (int i = 0; i < d->tabList.count(); ++i) {
        QStyleOptionTabV2 tab = d->getStyleOption(i);
        if (!(tab.state & QStyle::State_Enabled)) {
            tab.palette.setCurrentColorGroup(QPalette::Disabled);
        }
        // If this tab is partially obscured, make a note of it so that we can pass the information
        // along when we draw the tear.
        if ((!verticalTabs && (!rtl && tab.rect.left() < 0) || (rtl && tab.rect.right() > width()))
            || (verticalTabs && tab.rect.top() < 0)) {
            cut = i;
            cutTab = tab;
        }
        // Don't bother drawing a tab if the entire tab is outside of the visible tab bar.
        if ((!verticalTabs && (tab.rect.right() < 0 || tab.rect.left() > width()))
            || (verticalTabs && (tab.rect.bottom() < 0 || tab.rect.top() > height())))
            continue;

        optTabBase.tabBarRect |= tab.rect;
        if (i == d->currentIndex) {
            selected = i;
            selectedTab = tab;
            optTabBase.selectedTabRect = tab.rect;
            continue;
        }
        p.drawControl(QStyle::CE_TabBarTab, tab);
    }

    // Draw the selected tab last to get it "on top"
    if (selected >= 0) {
        QStyleOptionTabV2 tab = d->getStyleOption(selected);
        p.drawControl(QStyle::CE_TabBarTab, tab);
    }
    if (d->drawBase)
        p.drawPrimitive(QStyle::PE_FrameTabBarBase, optTabBase);

    // Only draw the tear indicator if necessary. Most of the time we don't need too.
    if (d->leftB->isVisible() && cut >= 0) {
        cutTab.rect = rect();
        cutTab.rect = style()->subElementRect(QStyle::SE_TabBarTearIndicator, &cutTab, this);
        p.drawPrimitive(QStyle::PE_IndicatorTabTear, cutTab);
    }
}

/*!\reimp
 */
void QTabBar::mousePressEvent (QMouseEvent *e)
{
    Q_D(QTabBar);
    if (e->button() != Qt::LeftButton) {
        e->ignore();
        return;
    }
    d->pressedIndex = d->indexAtPos(e->pos());
    if (d->pressedIndex >= 0) {
        if (e->type() == style()->styleHint(QStyle::SH_TabBar_SelectMouseType, 0, this))
            setCurrentIndex(d->pressedIndex);
        else
            repaint(tabRect(d->pressedIndex));
    }
}

/*!\reimp
 */
void QTabBar::mouseMoveEvent (QMouseEvent *e)
{
    Q_D(QTabBar);
    if (e->buttons() != Qt::LeftButton) {
        e->ignore();
        return;
    }
    if (style()->styleHint(QStyle::SH_TabBar_SelectMouseType, 0, this)
            == QEvent::MouseButtonRelease) {
        int i = d->indexAtPos(e->pos());
        if (i != d->pressedIndex) {
            int oldIndex = d->pressedIndex;
            d->pressedIndex = -1;
            if (oldIndex >= 0)
                repaint(tabRect(oldIndex));
            if ((d->pressedIndex = i) >= 0)
                repaint(tabRect(i));
        }
    }
}

/*!\reimp
 */
void QTabBar::mouseReleaseEvent (QMouseEvent *e)
{
    Q_D(QTabBar);
    if (e->button() != Qt::LeftButton)
        e->ignore();

    int i = d->indexAtPos(e->pos()) == d->pressedIndex ? d->pressedIndex : -1;
    d->pressedIndex = -1;
    if (e->type() == style()->styleHint(QStyle::SH_TabBar_SelectMouseType, 0, this))
        setCurrentIndex(i);
}

/*!\reimp
 */
void QTabBar::keyPressEvent(QKeyEvent *e)
{
    Q_D(QTabBar);
    if (e->key() != Qt::Key_Left && e->key() != Qt::Key_Right) {
        e->ignore();
        return;
    }
    int dx = e->key() == (isRightToLeft() ? Qt::Key_Right : Qt::Key_Left) ? -1 : 1;
    for (int index = d->currentIndex + dx; d->validIndex(index); index += dx) {
        if (d->tabList.at(index).enabled) {
            setCurrentIndex(index);
            break;
        }
    }
}

/*!\reimp
 */
void QTabBar::changeEvent(QEvent *e)
{
    Q_D(QTabBar);
    d->refresh();
    QWidget::changeEvent(e);
}


/*!
    \fn void QTabBar::setCurrentTab(int index)

    Use setCurrentIndex() instead.
*/

/*!
    \fn void QTabBar::selected(int index);

    Use currentChanged() instead.
*/


#include "moc_qtabbar.cpp"

#endif // QT_NO_TABBAR