q3header.cpp

奇趣公司比较新的qt/emd版本

                p->drawLine(fr.x(), fr.y() + fr.height() - 2,
                             fr.x() + fr.width() - 1, fr.y() + fr.height() - 2);
            }
        }
        p->restore();
    }
}

/*!
    Paints the label of the section at position \a index, inside
    rectangle \a fr (which uses widget coordinates) using painter \a
    p.

    Called by paintSection()
*/
void Q3Header::paintSectionLabel(QPainter *p, int index, const QRect& fr)
{
    int section = mapToSection(index);
    if (section < 0)
        return;

    int dx = 0, dy = 0;
    QStyleOptionHeader opt = getStyleOption(this, section);
    if (d->sortSection == section)
        opt.sortIndicator = d->sortDirection ? QStyleOptionHeader::SortDown : QStyleOptionHeader::SortUp;
    if (index == handleIdx && (state == Pressed || state == Moving)) {
        dx = style()->pixelMetric(QStyle::PM_ButtonShiftHorizontal, &opt, this);
        dy = style()->pixelMetric(QStyle::PM_ButtonShiftVertical, &opt, this);
        opt.state |= QStyle::State_Sunken;
    }
    if (isEnabled())
        opt.state |= QStyle::State_Enabled;


    opt.rect.setRect(fr.x() + style()->pixelMetric(QStyle::PM_HeaderMargin) + dx, fr.y() + 2 + dy,
                     fr.width() - 6, fr.height() - 4);

    style()->drawControl(QStyle::CE_HeaderLabel, &opt, p, this);

    int arrowWidth = (orient == Qt::Horizontal ? height() : width()) / 2;
    int arrowHeight = fr.height() - 6;
    QSize ssh = sectionSizeHint(section, p->fontMetrics());
    int tw = (orient == Qt::Horizontal ? ssh.width() : ssh.height());
    int ew = 0;

    if (style()->styleHint(QStyle::SH_Header_ArrowAlignment, 0, this) & Qt::AlignRight)
        ew = fr.width() - tw - 8;
    if (d->sortSection == section && tw <= fr.width()) {
        if (reverse()) {
            tw = fr.width() - tw;
            ew = fr.width() - ew - tw;
        }
        opt.state = QStyle::State_None;
        if (isEnabled())
            opt.state |= QStyle::State_Enabled;
        if (d->sortDirection)
            opt.state |= QStyle::State_DownArrow;
        else
            opt.state |= QStyle::State_UpArrow;
        QRect ar(fr.x() + tw - arrowWidth - 6 + ew, 4, arrowWidth, arrowHeight);
        if (label(section).isRightToLeft())
            ar.moveBy( 2*(fr.right() - ar.right()) + ar.width() - fr.width(), 0 );
        opt.rect = ar;
        style()->drawPrimitive(QStyle::PE_IndicatorHeaderArrow, &opt, p, this);
    }
}


/*! \reimp */
void Q3Header::paintEvent(QPaintEvent *e)
{
    QPainter p(this);
    p.setPen(palette().buttonText().color());
    int pos = orient == Qt::Horizontal ? e->rect().left() : e->rect().top();
    int id = mapToIndex(sectionAt(pos + offset()));
    if (id < 0) {
        if (pos > 0)
            id = d->count;
        else if (reverse())
            id = d->count - 1;
        else
            id = 0;
    }
    if (reverse()) {
        for (int i = id; i >= 0; i--) {
            QRect r = sRect(i);
            paintSection(&p, i, r);
            if (r.right() >= e->rect().right())
                return;
        }
    } else {
        if (count() > 0) {
            for (int i = id; i <= count(); i++) {
                QRect r = sRect(i);
                /*
                  If the last section is clickable (and thus is
                  painted raised), draw the virtual section count()
                  as well. Otherwise it looks ugly.
                */
                if (i < count() || d->clicks[mapToSection(count() - 1)])
                    paintSection(&p, i, r);
                if (hasFocus() && d->focusIdx == i) {
                    QStyleOptionFocusRect opt;
                    opt.rect.setRect(r.x()+2, r.y()+2, r.width()-4, r.height()-4);
                    opt.palette = palette();
                    opt.state = QStyle::State_None;
                    style()->drawPrimitive(QStyle::PE_FrameFocusRect, &opt, &p, this);
                }
                if (orient == Qt::Horizontal && r. right() >= e->rect().right() ||
                     orient == Qt::Vertical && r. bottom() >= e->rect().bottom())
                    return;
            }
        }
    }
}

/*!
    \overload

    Sets the sort indicator to \a ascending. Use the other overload instead.
*/

void Q3Header::setSortIndicator(int section, bool ascending)
{
    d->sortSection = section;
    if (section != -1)
        oldHandleIdx = section;
    d->sortDirection = ascending;
    update();
    updateGeometry();
}

/*!
  \fn void Q3Header::setSortIndicator(int section, Qt::SortOrder order)

  Sets a sort indicator onto the specified \a section. The indicator's
  \a order is either Ascending or Descending.

  Only one section can show a sort indicator at any one time. If you
  don't want any section to show a sort indicator pass a \a section
  number of -1.

  \sa sortIndicatorSection(), sortIndicatorOrder()
*/

/*!
    Returns the section showing the sort indicator or -1 if there is no sort indicator.

    \sa setSortIndicator(), sortIndicatorOrder()
*/

int Q3Header::sortIndicatorSection() const
{
    return d->sortSection;
}

/*!
    Returns the implied sort order of the Q3Headers sort indicator.

    \sa setSortIndicator(), sortIndicatorSection()
*/

Qt::SortOrder Q3Header::sortIndicatorOrder() const
{
    return d->sortDirection ? Qt::AscendingOrder : Qt::DescendingOrder;
}

/*!
    Resizes section \a section to \a s pixels wide (or high).
*/

void Q3Header::resizeSection(int section, int s)
{
    setCellSize(section, s);
    update();
}

/*!
    Returns the width (or height) of the \a section in pixels.
*/

int Q3Header::sectionSize(int section) const
{
    if (section < 0 || section >= count())
        return 0;
    return d->sizes[section];
}

/*!
    Returns the position (in pixels) at which the \a section starts.

    \sa offset()
*/

int Q3Header::sectionPos(int section) const
{
    if (d->positionsDirty)
        ((Q3Header *)this)->calculatePositions();
    if (section < 0 || section >= count() )
        return 0;
    return d->positions[d->s2i[section]];
}

/*!
    Returns the index of the section which contains the position \a
    pos given in pixels from the left (or top).

    \sa offset()
*/

int Q3Header::sectionAt(int pos) const
{
    if (reverse())
        pos = d->lastPos - pos;
    return d->sectionAt(pos);
}

/*!
    Returns the number of the section that is displayed at index
    position \a index.
*/

int Q3Header::mapToSection(int index) const
{
    return (index >= 0 && index < count()) ? d->i2s[index] : -1;
}

/*!
    Returns the index position at which section \a section is
    displayed.
*/

int Q3Header::mapToIndex(int section) const
{
    return (section >= 0 && section < count()) ? d->s2i[section] : -1;
}

/*!
    Moves section \a section to index position \a toIndex.
*/

void Q3Header::moveSection(int section, int toIndex)
{
    int fromIndex = mapToIndex(section);
    if (fromIndex == toIndex ||
         fromIndex < 0 || fromIndex > count() ||
         toIndex < 0 || toIndex > count())
        return;
    int i;
    int idx = d->i2s[fromIndex];
    if (fromIndex < toIndex) {
        for (i = fromIndex; i < toIndex - 1; i++) {
            int t;
            d->i2s[i] = t = d->i2s[i+1];
            d->s2i[t] = i;
        }
        d->i2s[toIndex-1] = idx;
        d->s2i[idx] = toIndex-1;
    } else {
        for (i = fromIndex; i > toIndex; i--) {
            int t;
            d->i2s[i] = t = d->i2s[i-1];
            d->s2i[t] = i;
        }
        d->i2s[toIndex] = idx;
        d->s2i[idx] = toIndex;
    }
    calculatePositions();
}

/*!
    Returns true if section \a section is clickable; otherwise returns
    false.

    If \a section is out of range (negative or larger than count() -
    1): returns true if all sections are clickable; otherwise returns
    false.

    \sa setClickEnabled()
*/

bool Q3Header::isClickEnabled(int section) const
{
    if (section >= 0 && section < count()) {
        return (bool)d->clicks[section];
    }

    for (int i = 0; i < count(); ++i) {
        if (!d->clicks[i])
            return false;
    }
    return true;
}

/*!
    Returns true if section \a section is resizeable; otherwise
    returns false.

    If \a section is -1 then this function applies to all sections,
    i.e. returns true if all sections are resizeable; otherwise
    returns false.

    \sa setResizeEnabled()
*/

bool Q3Header::isResizeEnabled(int section) const
{
    if (section >= 0 && section < count()) {
        return (bool)d->resize[section];
    }

    for (int i = 0; i < count();++i) {
        if (!d->resize[i])
            return false;
    }
    return true;
}

bool Q3Header::isMovingEnabled() const
{
    return d->move;
}

/*! \internal */

void Q3Header::setUpdatesEnabled(bool enable)
{
    if (enable)
        calculatePositions();
    QWidget::setUpdatesEnabled(enable);
}


bool Q3Header::reverse () const
{
#if 0
    return (orient == Qt::Horizontal && QApplication::reverseLayout());
#else
    return false;
#endif
}

/*! \reimp */
void Q3Header::resizeEvent(QResizeEvent *e)
{
    if (e)
        QWidget::resizeEvent(e);

    if(d->lastPos < width()) {
            offs = 0;
    }

    if (e) {
        adjustHeaderSize(orientation() == Qt::Horizontal ?
                          width() - e->oldSize().width() : height() - e->oldSize().height());
        if ((orientation() == Qt::Horizontal && height() != e->oldSize().height())
             || (orientation() == Qt::Vertical && width() != e->oldSize().width()))
            update();
    } else
        adjustHeaderSize();
}

/*!
    \fn void Q3Header::adjustHeaderSize()

    Adjusts the size of the sections to fit the size of the header as
    completely as possible. Only sections for which isStretchEnabled()
    is true will be resized.
*/

void Q3Header::adjustHeaderSize(int diff)
{
    if (!count())
        return;

    // we skip the adjustHeaderSize when trying to resize the last column which is set to stretchable
    if (d->fullSize == (count() -1) &&
         (d->lastPos - d->sizes[count() -1]) > (orient == Qt::Horizontal ? width() : height()))
        return;

    if (d->fullSize >= 0) {
        int sec = mapToSection(d->fullSize);
        int lsec = mapToSection(count() - 1);
        int ns = sectionSize(sec) +
                 (orientation() == Qt::Horizontal ?
                   width() : height()) - (sectionPos(lsec) + sectionSize(lsec));
        int os = sectionSize(sec);
        if (ns < 20)
            ns = 20;
        setCellSize(sec, ns);
        repaint();
        emit sizeChange(sec, os, ns);
    } else if (d->fullSize == -1) {
        int df = diff / count();
        int part = orientation() == Qt::Horizontal ? width() / count() : height() / count();
        for (int i = 0; i < count() - 1; ++i) {
            int sec = mapToIndex(i);
            int os = sectionSize(sec);
            int ns = diff != -1 ? os + df : part;
            if (ns < 20)
                ns = 20;
            setCellSize(sec, ns);
            emit sizeChange(sec, os, ns);
        }
        int sec = mapToIndex(count() - 1);
        int ns = (orientation() == Qt::Horizontal ? width() : height()) - sectionPos(sec);
        int os = sectionSize(sec);
        if (ns < 20)
            ns = 20;
        setCellSize(sec, ns);
        repaint();
        emit sizeChange(sec, os, ns);
    }
}

/*!
    Returns the total width of all the header columns.
*/
int Q3Header::headerWidth() const
{
    if (d->pos_dirty) {
        ((Q3Header*)this)->calculatePositions();
        d->pos_dirty = false;
    }
    return d->lastPos;
}

void Q3Header::calculatePositions(bool onlyVisible, int start)
{
    d->positionsDirty = false;
    d->lastPos = count() > 0 ? d->positions[start] : 0;
    for (int i = start; i < count(); i++) {
        d->positions[i] = d->lastPos;
        d->lastPos += d->sizes[d->i2s[i]];
        if (onlyVisible && d->lastPos > offset() +
             (orientation() == Qt::Horizontal ? width() : height()))
            break;
    }
    d->pos_dirty = onlyVisible;
}


/*!
    \property Q3Header::stretching
    \brief whether the header sections always take up the full width
    (or height) of the header
*/


/*!
    If \a b is true, section \a section will be resized when the
    header is resized, so that the sections take up the full width (or
    height for vertical headers) of the header; otherwise section \a
    section will be set to be unstretchable and will not resize when
    the header is resized.

    If \a section is -1, and if \a b is true, then all sections will
    be resized equally when the header is resized so that they take up
    the full width (or height for vertical headers) of the header;
    otherwise all the sections will be set to be unstretchable and
    will not resize when the header is resized.

    \sa adjustHeaderSize()
*/

void Q3Header::setStretchEnabled(bool b, int section)
{
    if (b)
        d->fullSize = section;
    else
        d->fullSize = -2;
    adjustHeaderSize();
}

bool Q3Header::isStretchEnabled() const
{
    return d->fullSize == -1;
}

/*!
    \overload

    Returns true if section \a section will resize to take up the full
    width (or height) of the header; otherwise returns false. If at
    least one section has stretch enabled the sections will always
    take up the full width of the header.

    \sa setStretchEnabled()
*/

bool Q3Header::isStretchEnabled(int section) const
{
    return d->fullSize == section;
}

/*!
  \reimp
*/
void Q3Header::changeEvent(QEvent *ev)
{
    if(ev->type() == QEvent::FontChange) {
        QFontMetrics fm = fontMetrics();
        d->height = (orient == Qt::Horizontal) ? fm.lineSpacing() + 6 : fm.width(QLatin1Char(' '));
    }
    QWidget::changeEvent(ev);
}

#endif // QT_NO_HEADER