MCL/sf/mw/qt: comparison src/gui/itemviews/qheaderview.cpp

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the Technology Preview License Agreement accompanying
+** this package.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights.  These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+#include "qheaderview.h"
+#ifndef QT_NO_ITEMVIEWS
+#include <qbitarray.h>
+#include <qbrush.h>
+#include <qdebug.h>
+#include <qevent.h>
+#include <qpainter.h>
+#include <qscrollbar.h>
+#include <qtooltip.h>
+#include <qwhatsthis.h>
+#include <qstyle.h>
+#include <qstyleoption.h>
+#include <qvector.h>
+#include <qapplication.h>
+#include <qvarlengtharray.h>
+#include <qabstractitemdelegate.h>
+#include <qvariant.h>
+#include <private/qheaderview_p.h>
+#include <private/qabstractitemmodel_p.h>
+#ifndef QT_NO_DATASTREAM
+#include <qdatastream.h>
+#endif
+QT_BEGIN_NAMESPACE
+#ifndef QT_NO_DATASTREAM
+QDataStream &operator<<(QDataStream &out, const QHeaderViewPrivate::SectionSpan &span)
+{
+span.write(out);
+return out;
+}
+QDataStream &operator>>(QDataStream &in, QHeaderViewPrivate::SectionSpan &span)
+{
+span.read(in);
+return in;
+}
+#endif // QT_NO_DATASTREAM
+/*!
+\class QHeaderView
+\brief The QHeaderView class provides a header row or header column for
+item views.
+\ingroup model-view
+A QHeaderView displays the headers used in item views such as the
+QTableView and QTreeView classes. It takes the place of Qt3's \c QHeader
+class previously used for the same purpose, but uses the Qt's model/view
+architecture for consistency with the item view classes.
+The QHeaderView class is one of the \l{Model/View Classes} and is part of
+Qt's \l{Model/View Programming}{model/view framework}.
+The header gets the data for each section from the model using the
+QAbstractItemModel::headerData() function. You can set the data by using
+QAbstractItemModel::setHeaderData().
+Each header has an orientation() and a number of sections, given by the
+count() function. A section refers to a part of the header - either a row
+or a column, depending on the orientation.
+Sections can be moved and resized using moveSection() and resizeSection();
+they can also be hidden and shown with hideSection() and showSection().
+Each section of a header is described by a section ID, specified by its
+section(), and can be located at a particular visualIndex() in the header.
+A section can have a sort indicator set with setSortIndicator(); this
+indicates whether the items in the associated item view will be sorted in
+the order given by the section.
+For a horizontal header the section is equivalent to a column in the model,
+and for a vertical header the section is equivalent to a row in the model.
+\section1 Moving Header Sections
+A header can be fixed in place, or made movable with setMovable(). It can
+be made clickable with setClickable(), and has resizing behavior in
+accordance with setResizeMode().
+\note Double-clicking on a header to resize a section only applies for
+visible rows.
+A header will emit sectionMoved() if the user moves a section,
+sectionResized() if the user resizes a section, and sectionClicked() as
+well as sectionHandleDoubleClicked() in response to mouse clicks. A header
+will also emit sectionCountChanged() and sectionAutoResize().
+You can identify a section using the logicalIndex() and logicalIndexAt()
+functions, or by its index position, using the visualIndex() and
+visualIndexAt() functions. The visual index will change if a section is
+moved, but the logical index will not change.
+\section1 Appearance
+QTableWidget and QTableView create default headers. If you want
+the headers to be visible, you can use \l{QFrame::}{setVisible()}.
+Not all \l{Qt::}{ItemDataRole}s will have an effect on a
+QHeaderView. If you need to draw other roles, you can subclass
+QHeaderView and reimplement \l{QHeaderView::}{paintEvent()}.
+QHeaderView respects the following item data roles:
+\l{Qt::}{TextAlignmentRole}, \l{Qt::}{DisplayRole},
+\l{Qt::}{FontRole}, \l{Qt::}{DecorationRole},
+\l{Qt::}{ForegroundRole}, and \l{Qt::}{BackgroundRole}.
+\note Each header renders the data for each section itself, and does not
+rely on a delegate. As a result, calling a header's setItemDelegate()
+function will have no effect.
+\sa {Model/View Programming}, QListView, QTableView, QTreeView
+*/
+/*!
+\enum QHeaderView::ResizeMode
+The resize mode specifies the behavior of the header sections. It can be
+set on the entire header view or on individual sections using
+setResizeMode().
+\value Interactive The user can resize the section. The section can also be
+resized programmatically using resizeSection().  The section size
+defaults to \l defaultSectionSize. (See also
+\l cascadingSectionResizes.)
+\value Fixed The user cannot resize the section. The section can only be
+resized programmatically using resizeSection(). The section size
+defaults to \l defaultSectionSize.
+\value Stretch QHeaderView will automatically resize the section to fill
+the available space. The size cannot be changed by the user or
+programmatically.
+\value ResizeToContents QHeaderView will automatically resize the section
+to its optimal size based on the contents of the entire column or
+row. The size cannot be changed by the user or programmatically.
+(This value was introduced in 4.2)
+The following values are obsolete:
+\value Custom Use Fixed instead.
+\sa setResizeMode() stretchLastSection minimumSectionSize
+*/
+/*!
+\fn void QHeaderView::sectionMoved(int logicalIndex, int oldVisualIndex,
+int newVisualIndex)
+This signal is emitted when a section is moved. The section's logical index
+is specified by \a logicalIndex, the old index by \a oldVisualIndex, and
+the new index position by \a newVisualIndex.
+\sa moveSection()
+*/
+/*!
+\fn void QHeaderView::sectionResized(int logicalIndex, int oldSize,
+int newSize)
+This signal is emitted when a section is resized. The section's logical
+number is specified by \a logicalIndex, the old size by \a oldSize, and the
+new size by \a newSize.
+\sa resizeSection()
+*/
+/*!
+\fn void QHeaderView::sectionPressed(int logicalIndex)
+This signal is emitted when a section is pressed. The section's logical
+index is specified by \a logicalIndex.
+\sa setClickable()
+*/
+/*!
+\fn void QHeaderView::sectionClicked(int logicalIndex)
+This signal is emitted when a section is clicked. The section's logical
+index is specified by \a logicalIndex.
+Note that the sectionPressed signal will also be emitted.
+\sa setClickable(), sectionPressed()
+*/
+/*!
+\fn void QHeaderView::sectionEntered(int logicalIndex)
+\since 4.3
+This signal is emitted when the cursor moves over the section and the left
+mouse button is pressed. The section's logical index is specified by
+\a logicalIndex.
+\sa setClickable(), sectionPressed()
+*/
+/*!
+\fn void QHeaderView::sectionDoubleClicked(int logicalIndex)
+This signal is emitted when a section is double-clicked. The section's
+logical index is specified by \a logicalIndex.
+\sa setClickable()
+*/
+/*!
+\fn void QHeaderView::sectionCountChanged(int oldCount, int newCount)
+This signal is emitted when the number of sections changes, i.e., when
+sections are added or deleted. The original count is specified by
+\a oldCount, and the new count by \a newCount.
+\sa count(), length(), headerDataChanged()
+*/
+/*!
+\fn void QHeaderView::sectionHandleDoubleClicked(int logicalIndex)
+This signal is emitted when a section is double-clicked. The section's
+logical index is specified by \a logicalIndex.
+\sa setClickable()
+*/
+/*!
+\fn void QHeaderView::sortIndicatorChanged(int logicalIndex,
+Qt::SortOrder order)
+\since 4.3
+This signal is emitted when the section containing the sort indicator or
+the order indicated is changed. The section's logical index is specified
+by \a logicalIndex and the sort order is specified by \a order.
+\sa setSortIndicator()
+*/
+/*!
+\fn void QHeaderView::sectionAutoResize(int logicalIndex,
+QHeaderView::ResizeMode mode)
+This signal is emitted when a section is automatically resized. The
+section's logical index is specified by \a logicalIndex, and the resize
+mode by \a mode.
+\sa setResizeMode(), stretchLastSection()
+*/
+// ### Qt 5: change to sectionAutoResized()
+/*!
+\fn void QHeaderView::geometriesChanged()
+\since 4.2
+This signal is emitted when the header's geometries have changed.
+*/
+/*!
+\property QHeaderView::highlightSections
+\brief whether the sections containing selected items are highlighted
+By default, this property is false.
+*/
+/*!
+Creates a new generic header with the given \a orientation and \a parent.
+*/
+QHeaderView::QHeaderView(Qt::Orientation orientation, QWidget *parent)
+: QAbstractItemView(*new QHeaderViewPrivate, parent)
+{
+Q_D(QHeaderView);
+d->setDefaultValues(orientation);
+initialize();
+}
+/*!
+\internal
+*/
+QHeaderView::QHeaderView(QHeaderViewPrivate &dd,
+Qt::Orientation orientation, QWidget *parent)
+: QAbstractItemView(dd, parent)
+{
+Q_D(QHeaderView);
+d->setDefaultValues(orientation);
+initialize();
+}
+/*!
+Destroys the header.
+*/
+QHeaderView::~QHeaderView()
+{
+}
+/*!
+\internal
+*/
+void QHeaderView::initialize()
+{
+Q_D(QHeaderView);
+setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+setFrameStyle(NoFrame);
+setFocusPolicy(Qt::NoFocus);
+d->viewport->setMouseTracking(true);
+d->viewport->setBackgroundRole(QPalette::Button);
+d->textElideMode = Qt::ElideNone;
+delete d->itemDelegate;
+}
+/*!
+\reimp
+*/
+void QHeaderView::setModel(QAbstractItemModel *model)
+{
+if (model == this->model())
+return;
+Q_D(QHeaderView);
+if (d->model && d->model != QAbstractItemModelPrivate::staticEmptyModel()) {
+if (d->orientation == Qt::Horizontal) {
+QObject::disconnect(d->model, SIGNAL(columnsInserted(QModelIndex,int,int)),
+this, SLOT(sectionsInserted(QModelIndex,int,int)));
+QObject::disconnect(d->model, SIGNAL(columnsAboutToBeRemoved(QModelIndex,int,int)),
+this, SLOT(sectionsAboutToBeRemoved(QModelIndex,int,int)));
+QObject::disconnect(d->model, SIGNAL(columnsRemoved(QModelIndex,int,int)),
+this, SLOT(_q_sectionsRemoved(QModelIndex,int,int)));
+} else {
+QObject::disconnect(d->model, SIGNAL(rowsInserted(QModelIndex,int,int)),
+this, SLOT(sectionsInserted(QModelIndex,int,int)));
+QObject::disconnect(d->model, SIGNAL(rowsAboutToBeRemoved(QModelIndex,int,int)),
+this, SLOT(sectionsAboutToBeRemoved(QModelIndex,int,int)));
+QObject::disconnect(d->model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
+this, SLOT(_q_sectionsRemoved(QModelIndex,int,int)));
+}
+QObject::disconnect(d->model, SIGNAL(headerDataChanged(Qt::Orientation,int,int)),
+this, SLOT(headerDataChanged(Qt::Orientation,int,int)));
+QObject::disconnect(d->model, SIGNAL(layoutAboutToBeChanged()),
+this, SLOT(_q_layoutAboutToBeChanged()));
+}
+if (model && model != QAbstractItemModelPrivate::staticEmptyModel()) {
+if (d->orientation == Qt::Horizontal) {
+QObject::connect(model, SIGNAL(columnsInserted(QModelIndex,int,int)),
+this, SLOT(sectionsInserted(QModelIndex,int,int)));
+QObject::connect(model, SIGNAL(columnsAboutToBeRemoved(QModelIndex,int,int)),
+this, SLOT(sectionsAboutToBeRemoved(QModelIndex,int,int)));
+QObject::connect(model, SIGNAL(columnsRemoved(QModelIndex,int,int)),
+this, SLOT(_q_sectionsRemoved(QModelIndex,int,int)));
+} else {
+QObject::connect(model, SIGNAL(rowsInserted(QModelIndex,int,int)),
+this, SLOT(sectionsInserted(QModelIndex,int,int)));
+QObject::connect(model, SIGNAL(rowsAboutToBeRemoved(QModelIndex,int,int)),
+this, SLOT(sectionsAboutToBeRemoved(QModelIndex,int,int)));
+QObject::connect(model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
+this, SLOT(_q_sectionsRemoved(QModelIndex,int,int)));
+}
+QObject::connect(model, SIGNAL(headerDataChanged(Qt::Orientation,int,int)),
+this, SLOT(headerDataChanged(Qt::Orientation,int,int)));
+QObject::connect(model, SIGNAL(layoutAboutToBeChanged()),
+this, SLOT(_q_layoutAboutToBeChanged()));
+}
+d->state = QHeaderViewPrivate::NoClear;
+QAbstractItemView::setModel(model);
+d->state = QHeaderViewPrivate::NoState;
+// Users want to set sizes and modes before the widget is shown.
+// Thus, we have to initialize when the model is set,
+// and not lazily like we do in the other views.
+initializeSections();
+}
+/*!
+Returns the orientation of the header.
+\sa Qt::Orientation
+*/
+Qt::Orientation QHeaderView::orientation() const
+{
+Q_D(const QHeaderView);
+return d->orientation;
+}
+/*!
+Returns the offset of the header: this is the header's left-most (or
+top-most for vertical headers) visible pixel.
+\sa setOffset()
+*/
+int QHeaderView::offset() const
+{
+Q_D(const QHeaderView);
+return d->offset;
+}
+/*!
+\fn void QHeaderView::setOffset(int offset)
+Sets the header's offset to \a offset.
+\sa offset(), length()
+*/
+void QHeaderView::setOffset(int newOffset)
+{
+Q_D(QHeaderView);
+if (d->offset == (int)newOffset)
+return;
+int ndelta = d->offset - newOffset;
+d->offset = newOffset;
+if (d->orientation == Qt::Horizontal)
+d->viewport->scroll(isRightToLeft() ? -ndelta : ndelta, 0);
+else
+d->viewport->scroll(0, ndelta);
+if (d->state == QHeaderViewPrivate::ResizeSection) {
+QPoint cursorPos = QCursor::pos();
+if (d->orientation == Qt::Horizontal)
+QCursor::setPos(cursorPos.x() + ndelta, cursorPos.y());
+else
+QCursor::setPos(cursorPos.x(), cursorPos.y() + ndelta);
+d->firstPos += ndelta;
+d->lastPos += ndelta;
+}
+}
+/*!
+\since 4.2
+Sets the offset to the start of the section at the given \a visualIndex.
+\sa setOffset(), sectionPosition()
+*/
+void QHeaderView::setOffsetToSectionPosition(int visualIndex)
+{
+Q_D(QHeaderView);
+if (visualIndex > -1 && visualIndex < d->sectionCount) {
+int position = d->headerSectionPosition(d->adjustedVisualIndex(visualIndex));
+setOffset(position);
+}
+}
+/*!
+\since 4.2
+Sets the offset to make the last section visible.
+\sa setOffset(), sectionPosition(), setOffsetToSectionPosition()
+*/
+void QHeaderView::setOffsetToLastSection()
+{
+Q_D(const QHeaderView);
+int size = (d->orientation == Qt::Horizontal ? viewport()->width() : viewport()->height());
+int position = length() - size;
+setOffset(position);
+}
+/*!
+Returns the length along the orientation of the header.
+\sa sizeHint(), setResizeMode(), offset()
+*/
+int QHeaderView::length() const
+{
+Q_D(const QHeaderView);
+//Q_ASSERT(d->headerLength() == d->length);
+return d->length;
+}
+/*!
+Returns a suitable size hint for this header.
+\sa sectionSizeHint()
+*/
+QSize QHeaderView::sizeHint() const
+{
+Q_D(const QHeaderView);
+if (d->cachedSizeHint.isValid())
+return d->cachedSizeHint;
+d->cachedSizeHint = QSize(0, 0); //reinitialize the cached size hint
+const int sectionCount = count();
+// get size hint for the first n sections
+int i = 0;
+for (int checked = 0; checked < 100 && i < sectionCount; ++i) {
+if (isSectionHidden(i))
+continue;
+checked++;
+QSize hint = sectionSizeFromContents(i);
+d->cachedSizeHint = d->cachedSizeHint.expandedTo(hint);
+}
+// get size hint for the last n sections
+i = qMax(i, sectionCount - 100 );
+for (int j = sectionCount - 1, checked = 0; j >= i && checked < 100; --j) {
+if (isSectionHidden(j))
+continue;
+checked++;
+QSize hint = sectionSizeFromContents(j);
+d->cachedSizeHint = d->cachedSizeHint.expandedTo(hint);
+}
+return d->cachedSizeHint;
+}
+/*!
+Returns a suitable size hint for the section specified by \a logicalIndex.
+\sa sizeHint(), defaultSectionSize(), minimumSectionSize(),
+Qt::SizeHintRole
+*/
+int QHeaderView::sectionSizeHint(int logicalIndex) const
+{
+Q_D(const QHeaderView);
+if (isSectionHidden(logicalIndex))
+return 0;
+if (logicalIndex < 0 || logicalIndex >= count())
+return -1;
+QSize size;
+QVariant value = d->model->headerData(logicalIndex, d->orientation, Qt::SizeHintRole);
+if (value.isValid())
+size = qvariant_cast<QSize>(value);
+else
+size = sectionSizeFromContents(logicalIndex);
+int hint = d->orientation == Qt::Horizontal ? size.width() : size.height();
+return qMax(minimumSectionSize(), hint);
+}
+/*!
+Returns the visual index of the section that covers the given \a position
+in the viewport.
+\sa logicalIndexAt()
+*/
+int QHeaderView::visualIndexAt(int position) const
+{
+Q_D(const QHeaderView);
+int vposition = position;
+d->executePostedLayout();
+d->executePostedResize();
+const int count = d->sectionCount;
+if (count < 1)
+return -1;
+if (d->reverse())
+vposition = d->viewport->width() - vposition;
+vposition += d->offset;
+if (vposition > d->length)
+return -1;
+int visual = d->headerVisualIndexAt(vposition);
+if (visual < 0)
+return -1;
+while (d->isVisualIndexHidden(visual)){
+++visual;
+if (visual >= count)
+return -1;
+}
+return visual;
+}
+/*!
+Returns the section that covers the given \a position in the viewport.
+\sa visualIndexAt(), isSectionHidden()
+*/
+int QHeaderView::logicalIndexAt(int position) const
+{
+const int visual = visualIndexAt(position);
+if (visual > -1)
+return logicalIndex(visual);
+return -1;
+}
+/*!
+Returns the width (or height for vertical headers) of the given
+\a logicalIndex.
+\sa length(), setResizeMode(), defaultSectionSize()
+*/
+int QHeaderView::sectionSize(int logicalIndex) const
+{
+Q_D(const QHeaderView);
+if (isSectionHidden(logicalIndex))
+return 0;
+if (logicalIndex < 0 || logicalIndex >= count())
+return 0;
+int visual = visualIndex(logicalIndex);
+if (visual == -1)
+return 0;
+d->executePostedResize();
+return d->headerSectionSize(visual);
+}
+/*!
+Returns the section position of the given \a logicalIndex, or -1 if the
+section is hidden.
+\sa sectionViewportPosition()
+*/
+int QHeaderView::sectionPosition(int logicalIndex) const
+{
+Q_D(const QHeaderView);
+int visual = visualIndex(logicalIndex);
+// in some cases users may change the selections
+// before we have a chance to do the layout
+if (visual == -1)
+return -1;
+d->executePostedResize();
+return d->headerSectionPosition(visual);
+}
+/*!
+Returns the section viewport position of the given \a logicalIndex.
+If the section is hidden, the return value is undefined.
+\sa sectionPosition(), isSectionHidden()
+*/
+int QHeaderView::sectionViewportPosition(int logicalIndex) const
+{
+Q_D(const QHeaderView);
+if (logicalIndex >= count())
+return -1;
+int position = sectionPosition(logicalIndex);
+if (position < 0)
+return position; // the section was hidden
+int offsetPosition = position - d->offset;
+if (d->reverse())
+return d->viewport->width() - (offsetPosition + sectionSize(logicalIndex));
+return offsetPosition;
+}
+/*!
+\fn int QHeaderView::logicalIndexAt(int x, int y) const
+Returns the logical index of the section at the given coordinate. If the
+header is horizontal \a x will be used, otherwise \a y will be used to
+find the logical index.
+*/
+/*!
+\fn int QHeaderView::logicalIndexAt(const QPoint &pos) const
+Returns the logical index of the section at the position given in \a pos.
+If the header is horizontal the x-coordinate will be used, otherwise the
+y-coordinate will be used to find the logical index.
+\sa sectionPosition()
+*/
+/*!
+Moves the section at visual index \a from to occupy visual index \a to.
+\sa sectionsMoved()
+*/
+void QHeaderView::moveSection(int from, int to)
+{
+Q_D(QHeaderView);
+d->executePostedLayout();
+if (from < 0 || from >= d->sectionCount || to < 0 || to >= d->sectionCount)
+return;
+if (from == to) {
+int logical = logicalIndex(from);
+Q_ASSERT(logical != -1);
+updateSection(logical);
+return;
+}
+if (stretchLastSection() &&  to == d->lastVisibleVisualIndex())
+d->lastSectionSize = sectionSize(from);
+//int oldHeaderLength = length(); // ### for debugging; remove later
+d->initializeIndexMapping();
+QBitArray sectionHidden = d->sectionHidden;
+int *visualIndices = d->visualIndices.data();
+int *logicalIndices = d->logicalIndices.data();
+int logical = logicalIndices[from];
+int visual = from;
+int affected_count = qAbs(to - from) + 1;
+QVarLengthArray<int> sizes(affected_count);
+QVarLengthArray<ResizeMode> modes(affected_count);
+// move sections and indices
+if (to > from) {
+sizes[to - from] = d->headerSectionSize(from);
+modes[to - from] = d->headerSectionResizeMode(from);
+while (visual < to) {
+sizes[visual - from] = d->headerSectionSize(visual + 1);
+modes[visual - from] = d->headerSectionResizeMode(visual + 1);
+if (!sectionHidden.isEmpty())
+sectionHidden.setBit(visual, sectionHidden.testBit(visual + 1));
+visualIndices[logicalIndices[visual + 1]] = visual;
+logicalIndices[visual] = logicalIndices[visual + 1];
+++visual;
+}
+} else {
+sizes[0] = d->headerSectionSize(from);
+modes[0] = d->headerSectionResizeMode(from);
+while (visual > to) {
+sizes[visual - to] = d->headerSectionSize(visual - 1);
+modes[visual - to] = d->headerSectionResizeMode(visual - 1);
+if (!sectionHidden.isEmpty())
+sectionHidden.setBit(visual, sectionHidden.testBit(visual - 1));
+visualIndices[logicalIndices[visual - 1]] = visual;
+logicalIndices[visual] = logicalIndices[visual - 1];
+--visual;
+}
+}
+if (!sectionHidden.isEmpty()) {
+sectionHidden.setBit(to, d->sectionHidden.testBit(from));
+d->sectionHidden = sectionHidden;
+}
+visualIndices[logical] = to;
+logicalIndices[to] = logical;
+//Q_ASSERT(oldHeaderLength == length());
+// move sizes
+// ### check for spans of section sizes here
+if (to > from) {
+for (visual = from; visual <= to; ++visual) {
+int size = sizes[visual - from];
+ResizeMode mode = modes[visual - from];
+d->createSectionSpan(visual, visual, size, mode);
+}
+} else {
+for (visual = to; visual <= from; ++visual) {
+int size = sizes[visual - to];
+ResizeMode mode = modes[visual - to];
+d->createSectionSpan(visual, visual, size, mode);
+}
+}
+//Q_ASSERT(d->headerLength() == length());
+//Q_ASSERT(oldHeaderLength == length());
+//Q_ASSERT(d->logicalIndices.count() == d->sectionCount);
+if (d->hasAutoResizeSections())
+d->doDelayedResizeSections();
+d->viewport->update();
+emit sectionMoved(logical, from, to);
+}
+/*!
+\since 4.2
+Swaps the section at visual index \a first with the section at visual
+index \a second.
+\sa moveSection()
+*/
+void QHeaderView::swapSections(int first, int second)
+{
+Q_D(QHeaderView);
+if (first == second)
+return;
+d->executePostedLayout();
+if (first < 0 || first >= d->sectionCount || second < 0 || second >= d->sectionCount)
+return;
+int firstSize = d->headerSectionSize(first);
+ResizeMode firstMode = d->headerSectionResizeMode(first);
+int firstLogical = d->logicalIndex(first);
+int secondSize = d->headerSectionSize(second);
+ResizeMode secondMode = d->headerSectionResizeMode(second);
+int secondLogical = d->logicalIndex(second);
+d->createSectionSpan(second, second, firstSize, firstMode);
+d->createSectionSpan(first, first, secondSize, secondMode);
+d->initializeIndexMapping();
+d->visualIndices[firstLogical] = second;
+d->logicalIndices[second] = firstLogical;
+d->visualIndices[secondLogical] = first;
+d->logicalIndices[first] = secondLogical;
+if (!d->sectionHidden.isEmpty()) {
+bool firstHidden = d->sectionHidden.testBit(first);
+bool secondHidden = d->sectionHidden.testBit(second);
+d->sectionHidden.setBit(first, secondHidden);
+d->sectionHidden.setBit(second, firstHidden);
+}
+d->viewport->update();
+emit sectionMoved(firstLogical, first, second);
+emit sectionMoved(secondLogical, second, first);
+}
+/*!
+\fn void QHeaderView::resizeSection(int logicalIndex, int size)
+Resizes the section specified by \a logicalIndex to \a size measured in
+pixels.
+\sa sectionResized(), resizeMode(), sectionSize()
+*/
+void QHeaderView::resizeSection(int logical, int size)
+{
+Q_D(QHeaderView);
+if (logical < 0 || logical >= count())
+return;
+if (isSectionHidden(logical)) {
+d->hiddenSectionSize.insert(logical, size);
+return;
+}
+int visual = visualIndex(logical);
+if (visual == -1)
+return;
+int oldSize = d->headerSectionSize(visual);
+if (oldSize == size)
+return;
+d->executePostedLayout();
+d->invalidateCachedSizeHint();
+if (stretchLastSection() && visual == d->lastVisibleVisualIndex())
+d->lastSectionSize = size;
+if (size != oldSize)
+d->createSectionSpan(visual, visual, size, d->headerSectionResizeMode(visual));
+int w = d->viewport->width();
+int h = d->viewport->height();
+int pos = sectionViewportPosition(logical);
+QRect r;
+if (d->orientation == Qt::Horizontal)
+if (isRightToLeft())
+r.setRect(0, 0, pos + size, h);
+else
+r.setRect(pos, 0, w - pos, h);
+else
+r.setRect(0, pos, w, h - pos);
+if (d->hasAutoResizeSections()) {
+d->doDelayedResizeSections();
+r = d->viewport->rect();
+}
+d->viewport->update(r.normalized());
+emit sectionResized(logical, oldSize, size);
+}
+/*!
+Resizes the sections according to the given \a mode, ignoring the current
+resize mode.
+\sa resizeMode(), sectionResized()
+*/
+void QHeaderView::resizeSections(QHeaderView::ResizeMode mode)
+{
+Q_D(QHeaderView);
+d->resizeSections(mode, true);
+}
+/*!
+\fn void QHeaderView::hideSection(int logicalIndex)
+Hides the section specified by \a logicalIndex.
+\sa showSection(), isSectionHidden(), hiddenSectionCount(),
+setSectionHidden()
+*/
+/*!
+\fn void QHeaderView::showSection(int logicalIndex)
+Shows the section specified by \a logicalIndex.
+\sa hideSection(), isSectionHidden(), hiddenSectionCount(),
+setSectionHidden()
+*/
+/*!
+Returns true if the section specified by \a logicalIndex is explicitly
+hidden from the user; otherwise returns false.
+\sa hideSection(), showSection(), setSectionHidden(), hiddenSectionCount()
+*/
+bool QHeaderView::isSectionHidden(int logicalIndex) const
+{
+Q_D(const QHeaderView);
+d->executePostedLayout();
+if (logicalIndex >= d->sectionHidden.count() || logicalIndex < 0 || logicalIndex >= d->sectionCount)
+return false;
+int visual = visualIndex(logicalIndex);
+Q_ASSERT(visual != -1);
+return d->sectionHidden.testBit(visual);
+}
+/*!
+\since 4.1
+Returns the number of sections in the header that has been hidden.
+\sa setSectionHidden(), isSectionHidden()
+*/
+int QHeaderView::hiddenSectionCount() const
+{
+Q_D(const QHeaderView);
+return d->hiddenSectionSize.count();
+}
+/*!
+If \a hide is true the section specified by \a logicalIndex is hidden;
+otherwise the section is shown.
+\sa isSectionHidden(), hiddenSectionCount()
+*/
+void QHeaderView::setSectionHidden(int logicalIndex, bool hide)
+{
+Q_D(QHeaderView);
+if (logicalIndex < 0 || logicalIndex >= count())
+return;
+d->executePostedLayout();
+int visual = visualIndex(logicalIndex);
+Q_ASSERT(visual != -1);
+if (hide == d->isVisualIndexHidden(visual))
+return;
+if (hide) {
+int size = d->headerSectionSize(visual);
+if (!d->hasAutoResizeSections())
+resizeSection(logicalIndex, 0);
+d->hiddenSectionSize.insert(logicalIndex, size);
+if (d->sectionHidden.count() < count())
+d->sectionHidden.resize(count());
+d->sectionHidden.setBit(visual, true);
+if (d->hasAutoResizeSections())
+d->doDelayedResizeSections();
+} else {
+int size = d->hiddenSectionSize.value(logicalIndex, d->defaultSectionSize);
+d->hiddenSectionSize.remove(logicalIndex);
+if (d->hiddenSectionSize.isEmpty()) {
+d->sectionHidden.clear();
+} else {
+Q_ASSERT(visual <= d->sectionHidden.count());
+d->sectionHidden.setBit(visual, false);
+}
+resizeSection(logicalIndex, size);
+}
+}
+/*!
+Returns the number of sections in the header.
+\sa  sectionCountChanged(), length()
+*/
+int QHeaderView::count() const
+{
+Q_D(const QHeaderView);
+//Q_ASSERT(d->sectionCount == d->headerSectionCount());
+// ### this may affect the lazy layout
+d->executePostedLayout();
+return d->sectionCount;
+}
+/*!
+Returns the visual index position of the section specified by the given
+\a logicalIndex, or -1 otherwise.
+Hidden sections still have valid visual indexes.
+\sa logicalIndex()
+*/
+int QHeaderView::visualIndex(int logicalIndex) const
+{
+Q_D(const QHeaderView);
+if (logicalIndex < 0)
+return -1;
+d->executePostedLayout();
+if (d->visualIndices.isEmpty()) { // nothing has been moved, so we have no mapping
+if (logicalIndex < d->sectionCount)
+return logicalIndex;
+} else if (logicalIndex < d->visualIndices.count()) {
+int visual = d->visualIndices.at(logicalIndex);
+Q_ASSERT(visual < d->sectionCount);
+return visual;
+}
+return -1;
+}
+/*!
+Returns the logicalIndex for the section at the given \a visualIndex
+position, or -1 if visualIndex < 0 or visualIndex >= QHeaderView::count().
+Note that the visualIndex is not affected by hidden sections.
+\sa visualIndex(), sectionPosition()
+*/
+int QHeaderView::logicalIndex(int visualIndex) const
+{
+Q_D(const QHeaderView);
+if (visualIndex < 0 || visualIndex >= d->sectionCount)
+return -1;
+return d->logicalIndex(visualIndex);
+}
+/*!
+If \a movable is true, the header may be moved by the user; otherwise it
+is fixed in place.
+\sa isMovable(), sectionMoved()
+*/
+// ### Qt 5: change to setSectionsMovable()
+void QHeaderView::setMovable(bool movable)
+{
+Q_D(QHeaderView);
+d->movableSections = movable;
+}
+/*!
+Returns true if the header can be moved by the user; otherwise returns
+false.
+\sa setMovable()
+*/
+// ### Qt 5: change to sectionsMovable()
+bool QHeaderView::isMovable() const
+{
+Q_D(const QHeaderView);
+return d->movableSections;
+}
+/*!
+If \a clickable is true, the header will respond to single clicks.
+\sa isClickable(), sectionClicked(), sectionPressed(),
+setSortIndicatorShown()
+*/
+// ### Qt 5: change to setSectionsClickable()
+void QHeaderView::setClickable(bool clickable)
+{
+Q_D(QHeaderView);
+d->clickableSections = clickable;
+}
+/*!
+Returns true if the header is clickable; otherwise returns false. A
+clickable header could be set up to allow the user to change the
+representation of the data in the view related to the header.
+\sa setClickable()
+*/
+// ### Qt 5: change to sectionsClickable()
+bool QHeaderView::isClickable() const
+{
+Q_D(const QHeaderView);
+return d->clickableSections;
+}
+void QHeaderView::setHighlightSections(bool highlight)
+{
+Q_D(QHeaderView);
+d->highlightSelected = highlight;
+}
+bool QHeaderView::highlightSections() const
+{
+Q_D(const QHeaderView);
+return d->highlightSelected;
+}
+/*!
+Sets the constraints on how the header can be resized to those described
+by the given \a mode.
+\sa resizeMode(), length(), sectionResized(), sectionAutoResize()
+*/
+void QHeaderView::setResizeMode(ResizeMode mode)
+{
+Q_D(QHeaderView);
+initializeSections();
+d->stretchSections = (mode == Stretch ? count() : 0);
+d->contentsSections =  (mode == ResizeToContents ? count() : 0);
+d->setGlobalHeaderResizeMode(mode);
+if (d->hasAutoResizeSections())
+d->doDelayedResizeSections(); // section sizes may change as a result of the new mode
+}
+/*!
+\overload
+Sets the constraints on how the section specified by \a logicalIndex in
+the header can be resized to those described by the given \a mode. The logical
+index should exist at the time this function is called.
+\note This setting will be ignored for the last section if the stretchLastSection
+property is set to true. This is the default for the horizontal headers provided
+by QTreeView.
+\sa setStretchLastSection()
+*/
+// ### Qt 5: change to setSectionResizeMode()
+void QHeaderView::setResizeMode(int logicalIndex, ResizeMode mode)
+{
+Q_D(QHeaderView);
+int visual = visualIndex(logicalIndex);
+Q_ASSERT(visual != -1);
+ResizeMode old = d->headerSectionResizeMode(visual);
+d->setHeaderSectionResizeMode(visual, mode);
+if (mode == Stretch && old != Stretch)
+++d->stretchSections;
+else if (mode == ResizeToContents && old != ResizeToContents)
+++d->contentsSections;
+else if (mode != Stretch && old == Stretch)
+--d->stretchSections;
+else if (mode != ResizeToContents && old == ResizeToContents)
+--d->contentsSections;
+if (d->hasAutoResizeSections() && d->state == QHeaderViewPrivate::NoState)
+d->doDelayedResizeSections(); // section sizes may change as a result of the new mode
+}
+/*!
+Returns the resize mode that applies to the section specified by the given
+\a logicalIndex.
+\sa setResizeMode()
+*/
+QHeaderView::ResizeMode QHeaderView::resizeMode(int logicalIndex) const
+{
+Q_D(const QHeaderView);
+int visual = visualIndex(logicalIndex);
+if (visual == -1)
+return Fixed; //the default value
+return d->headerSectionResizeMode(visual);
+}
+/*!
+\since 4.1
+Returns the number of sections that are set to resize mode stretch. In
+views, this can be used to see if the headerview needs to resize the
+sections when the view's geometry changes.
+\sa stretchLastSection, resizeMode()
+*/
+int QHeaderView::stretchSectionCount() const
+{
+Q_D(const QHeaderView);
+return d->stretchSections;
+}
+/*!
+\property QHeaderView::showSortIndicator
+\brief whether the sort indicator is shown
+By default, this property is false.
+\sa setClickable()
+*/
+void QHeaderView::setSortIndicatorShown(bool show)
+{
+Q_D(QHeaderView);
+if (d->sortIndicatorShown == show)
+return;
+d->sortIndicatorShown = show;
+if (sortIndicatorSection() < 0 || sortIndicatorSection() > count())
+return;
+if (d->headerSectionResizeMode(sortIndicatorSection()) == ResizeToContents)
+resizeSections();
+d->viewport->update();
+}
+bool QHeaderView::isSortIndicatorShown() const
+{
+Q_D(const QHeaderView);
+return d->sortIndicatorShown;
+}
+/*!
+Sets the sort indicator for the section specified by the given
+\a logicalIndex in the direction specified by \a order, and removes the
+sort indicator from any other section that was showing it.
+\a logicalIndex may be -1, in which case no sort indicator will be shown
+and the model will return to its natural, unsorted order. Note that not
+all models support this and may even crash in this case.
+\sa sortIndicatorSection() sortIndicatorOrder()
+*/
+void QHeaderView::setSortIndicator(int logicalIndex, Qt::SortOrder order)
+{
+Q_D(QHeaderView);
+// This is so that people can set the position of the sort indicator before the fill the model
+int old = d->sortIndicatorSection;
+d->sortIndicatorSection = logicalIndex;
+d->sortIndicatorOrder = order;
+if (logicalIndex >= d->sectionCount) {
+emit sortIndicatorChanged(logicalIndex, order);
+return; // nothing to do
+}
+if (old != logicalIndex
+&& ((logicalIndex >= 0 && resizeMode(logicalIndex) == ResizeToContents)
+|| old >= d->sectionCount || (old >= 0 && resizeMode(old) == ResizeToContents))) {
+resizeSections();
+d->viewport->update();
+} else {
+if (old >= 0 && old != logicalIndex)
+updateSection(old);
+if (logicalIndex >= 0)
+updateSection(logicalIndex);
+}
+emit sortIndicatorChanged(logicalIndex, order);
+}
+/*!
+Returns the logical index of the section that has a sort indicator.
+By default this is section 0.
+\sa setSortIndicator() sortIndicatorOrder() setSortIndicatorShown()
+*/
+int QHeaderView::sortIndicatorSection() const
+{
+Q_D(const QHeaderView);
+return d->sortIndicatorSection;
+}
+/*!
+Returns the order for the sort indicator. If no section has a sort
+indicator the return value of this function is undefined.
+\sa setSortIndicator() sortIndicatorSection()
+*/
+Qt::SortOrder QHeaderView::sortIndicatorOrder() const
+{
+Q_D(const QHeaderView);
+return d->sortIndicatorOrder;
+}
+/*!
+\property QHeaderView::stretchLastSection
+\brief whether the last visible section in the header takes up all the
+available space
+The default value is false.
+\note The horizontal headers provided by QTreeView are configured with this
+property set to true, ensuring that the view does not waste any of the
+space assigned to it for its header. If this value is set to true, this
+property will override the resize mode set on the last section in the
+header.
+\sa setResizeMode()
+*/
+bool QHeaderView::stretchLastSection() const
+{
+Q_D(const QHeaderView);
+return d->stretchLastSection;
+}
+void QHeaderView::setStretchLastSection(bool stretch)
+{
+Q_D(QHeaderView);
+d->stretchLastSection = stretch;
+if (d->state != QHeaderViewPrivate::NoState)
+return;
+if (stretch)
+resizeSections();
+else if (count())
+resizeSection(count() - 1, d->defaultSectionSize);
+}
+/*!
+\since 4.2
+\property QHeaderView::cascadingSectionResizes
+\brief whether interactive resizing will be cascaded to the following
+sections once the section being resized by the user has reached its
+minimum size
+This property only affects sections that have \l Interactive as their
+resize mode.
+The default value is false.
+\sa setResizeMode()
+*/
+bool QHeaderView::cascadingSectionResizes() const
+{
+Q_D(const QHeaderView);
+return d->cascadingResizing;
+}
+void QHeaderView::setCascadingSectionResizes(bool enable)
+{
+Q_D(QHeaderView);
+d->cascadingResizing = enable;
+}
+/*!
+\property QHeaderView::defaultSectionSize
+\brief the default size of the header sections before resizing.
+This property only affects sections that have \l Interactive or \l Fixed
+as their resize mode.
+\sa setResizeMode() minimumSectionSize
+*/
+int QHeaderView::defaultSectionSize() const
+{
+Q_D(const QHeaderView);
+return d->defaultSectionSize;
+}
+void QHeaderView::setDefaultSectionSize(int size)
+{
+Q_D(QHeaderView);
+d->setDefaultSectionSize(size);
+}
+/*!
+\since 4.2
+\property QHeaderView::minimumSectionSize
+\brief the minimum size of the header sections.
+The minimum section size is the smallest section size allowed. If the
+minimum section size is set to -1, QHeaderView will use the maximum of
+the \l{QApplication::globalStrut()}{global strut} or the
+\l{fontMetrics()}{font metrics} size.
+This property is honored by all \l{ResizeMode}{resize modes}.
+\sa setResizeMode() defaultSectionSize
+*/
+int QHeaderView::minimumSectionSize() const
+{
+Q_D(const QHeaderView);
+if (d->minimumSectionSize == -1) {
+QSize strut = QApplication::globalStrut();
+int margin = style()->pixelMetric(QStyle::PM_HeaderMargin, 0, this);
+if (d->orientation == Qt::Horizontal)
+return qMax(strut.width(), (fontMetrics().maxWidth() + margin));
+return qMax(strut.height(), (fontMetrics().lineSpacing() + margin));
+}
+return d->minimumSectionSize;
+}
+void QHeaderView::setMinimumSectionSize(int size)
+{
+Q_D(QHeaderView);
+d->minimumSectionSize = size;
+}
+/*!
+\since 4.1
+\property QHeaderView::defaultAlignment
+\brief the default alignment of the text in each header section
+*/
+Qt::Alignment QHeaderView::defaultAlignment() const
+{
+Q_D(const QHeaderView);
+return d->defaultAlignment;
+}
+void QHeaderView::setDefaultAlignment(Qt::Alignment alignment)
+{
+Q_D(QHeaderView);
+if (d->defaultAlignment == alignment)
+return;
+d->defaultAlignment = alignment;
+d->viewport->update();
+}
+/*!
+\internal
+*/
+void QHeaderView::doItemsLayout()
+{
+initializeSections();
+QAbstractItemView::doItemsLayout();
+}
+/*!
+Returns true if sections in the header has been moved; otherwise returns
+false;
+\sa moveSection()
+*/
+bool QHeaderView::sectionsMoved() const
+{
+Q_D(const QHeaderView);
+return !d->visualIndices.isEmpty();
+}
+/*!
+\since 4.1
+Returns true if sections in the header has been hidden; otherwise returns
+false;
+\sa setSectionHidden()
+*/
+bool QHeaderView::sectionsHidden() const
+{
+Q_D(const QHeaderView);
+return !d->hiddenSectionSize.isEmpty();
+}
+#ifndef QT_NO_DATASTREAM
+/*!
+\since 4.3
+Saves the current state of this header view.
+To restore the saved state, pass the return value to restoreState().
+\sa restoreState()
+*/
+QByteArray QHeaderView::saveState() const
+{
+Q_D(const QHeaderView);
+QByteArray data;
+QDataStream stream(&data, QIODevice::WriteOnly);
+stream << QHeaderViewPrivate::VersionMarker;
+stream << 0; // current version is 0
+d->write(stream);
+return data;
+}
+/*!
+\since 4.3
+Restores the \a state of this header view.
+This function returns \c true if the state was restored; otherwise returns
+false.
+\sa saveState()
+*/
+bool QHeaderView::restoreState(const QByteArray &state)
+{
+Q_D(QHeaderView);
+if (state.isEmpty())
+return false;
+QByteArray data = state;
+QDataStream stream(&data, QIODevice::ReadOnly);
+int marker;
+int ver;
+stream >> marker;
+stream >> ver;
+if (stream.status() != QDataStream::Ok
+|| marker != QHeaderViewPrivate::VersionMarker
+|| ver != 0) // current version is 0
+return false;
+if (d->read(stream)) {
+emit sortIndicatorChanged(d->sortIndicatorSection, d->sortIndicatorOrder );
+d->viewport->update();
+return true;
+}
+return false;
+}
+#endif // QT_NO_DATASTREAM
+/*!
+\reimp
+*/
+void QHeaderView::reset()
+{
+QAbstractItemView::reset();
+// it would be correct to call clear, but some apps rely
+// on the header keeping the sections, even after calling reset
+//d->clear();
+initializeSections();
+}
+/*!
+Updates the changed header sections with the given \a orientation, from
+\a logicalFirst to \a logicalLast inclusive.
+*/
+void QHeaderView::headerDataChanged(Qt::Orientation orientation, int logicalFirst, int logicalLast)
+{
+Q_D(QHeaderView);
+if (d->orientation != orientation)
+return;
+if (logicalFirst < 0 || logicalLast < 0 || logicalFirst >= count() || logicalLast >= count())
+return;
+d->invalidateCachedSizeHint();
+int firstVisualIndex = INT_MAX, lastVisualIndex = -1;
+for (int section = logicalFirst; section <= logicalLast; ++section) {
+const int visual = visualIndex(section);
+firstVisualIndex = qMin(firstVisualIndex, visual);
+lastVisualIndex =  qMax(lastVisualIndex,  visual);
+}
+d->executePostedResize();
+const int first = d->headerSectionPosition(firstVisualIndex),
+last = d->headerSectionPosition(lastVisualIndex)
++ d->headerSectionSize(lastVisualIndex);
+if (orientation == Qt::Horizontal) {
+d->viewport->update(first, 0, last - first, d->viewport->height());
+} else {
+d->viewport->update(0, first, d->viewport->width(), last - first);
+}
+}
+/*!
+\internal
+\since 4.2
+Updates the section specified by the given \a logicalIndex.
+*/
+void QHeaderView::updateSection(int logicalIndex)
+{
+Q_D(QHeaderView);
+if (d->orientation == Qt::Horizontal)
+d->viewport->update(QRect(sectionViewportPosition(logicalIndex),
+0, sectionSize(logicalIndex), d->viewport->height()));
+else
+d->viewport->update(QRect(0, sectionViewportPosition(logicalIndex),
+d->viewport->width(), sectionSize(logicalIndex)));
+}
+/*!
+Resizes the sections according to their size hints. Normally, you do not
+have to call this function.
+*/
+void QHeaderView::resizeSections()
+{
+Q_D(QHeaderView);
+if (d->hasAutoResizeSections())
+d->resizeSections(Interactive, false); // no global resize mode
+}
+/*!
+This slot is called when sections are inserted into the \a parent.
+\a logicalFirst and \a logicalLast indices signify where the new sections
+were inserted.
+If only one section is inserted, \a logicalFirst and \a logicalLast will
+be the same.
+*/
+void QHeaderView::sectionsInserted(const QModelIndex &parent,
+int logicalFirst, int logicalLast)
+{
+Q_D(QHeaderView);
+if (parent != d->root)
+return; // we only handle changes in the top level
+int oldCount = d->sectionCount;
+d->invalidateCachedSizeHint();
+// add the new sections
+int insertAt = 0;
+for (int spanStart = 0; insertAt < d->sectionSpans.count() && spanStart < logicalFirst; ++insertAt)
+spanStart += d->sectionSpans.at(insertAt).count;
+int insertCount = logicalLast - logicalFirst + 1;
+d->sectionCount += insertCount;
+if (d->sectionSpans.isEmpty() || insertAt >= d->sectionSpans.count()) {
+int insertLength = d->defaultSectionSize * insertCount;
+d->length += insertLength;
+QHeaderViewPrivate::SectionSpan span(insertLength, insertCount, d->globalResizeMode);
+d->sectionSpans.append(span);
+} else if ((d->sectionSpans.at(insertAt).sectionSize() == d->defaultSectionSize)
+&& d->sectionSpans.at(insertAt).resizeMode == d->globalResizeMode) {
+// add the new sections to an existing span
+int insertLength = d->sectionSpans.at(insertAt).sectionSize() * insertCount;
+d->length += insertLength;
+d->sectionSpans[insertAt].size += insertLength;
+d->sectionSpans[insertAt].count += insertCount;
+} else {
+// separate them out into their own span
+int insertLength = d->defaultSectionSize * insertCount;
+d->length += insertLength;
+QHeaderViewPrivate::SectionSpan span(insertLength, insertCount, d->globalResizeMode);
+d->sectionSpans.insert(insertAt, span);
+}
+// update sorting column
+if (d->sortIndicatorSection >= logicalFirst)
+d->sortIndicatorSection += insertCount;
+// update resize mode section counts
+if (d->globalResizeMode == Stretch)
+d->stretchSections = d->sectionCount;
+else if (d->globalResizeMode == ResizeToContents)
+d->contentsSections = d->sectionCount;
+// clear selection cache
+d->sectionSelected.clear();
+// update mapping
+if (!d->visualIndices.isEmpty() && !d->logicalIndices.isEmpty()) {
+Q_ASSERT(d->visualIndices.count() == d->logicalIndices.count());
+int mappingCount = d->visualIndices.count();
+for (int i = 0; i < mappingCount; ++i) {
+if (d->visualIndices.at(i) >= logicalFirst)
+d->visualIndices[i] += insertCount;
+if (d->logicalIndices.at(i) >= logicalFirst)
+d->logicalIndices[i] += insertCount;
+}
+for (int j = logicalFirst; j <= logicalLast; ++j) {
+d->visualIndices.insert(j, j);
+d->logicalIndices.insert(j, j);
+}
+}
+// insert sections into sectionsHidden
+if (!d->sectionHidden.isEmpty()) {
+QBitArray sectionHidden(d->sectionHidden);
+sectionHidden.resize(sectionHidden.count() + insertCount);
+//sectionHidden.fill(false, logicalFirst, logicalLast + 1);
+for (int i = logicalFirst; i <= logicalLast; ++i)
+// visual == logical in this range (see previous block)
+sectionHidden.setBit(i, false);
+for (int j = logicalLast + 1; j < sectionHidden.count(); ++j)
+sectionHidden.setBit(d->visualIndex(j),
+d->sectionHidden.testBit(d->visualIndex(j - insertCount)));
+d->sectionHidden = sectionHidden;
+}
+// insert sections into hiddenSectionSize
+QHash<int, int> newHiddenSectionSize; // from logical index to section size
+for (int i = 0; i < logicalFirst; ++i)
+if (isSectionHidden(i))
+newHiddenSectionSize[i] = d->hiddenSectionSize[i];
+for (int j = logicalLast + 1; j < d->sectionCount; ++j)
+if (isSectionHidden(j))
+newHiddenSectionSize[j] = d->hiddenSectionSize[j - insertCount];
+d->hiddenSectionSize = newHiddenSectionSize;
+d->doDelayedResizeSections();
+emit sectionCountChanged(oldCount, count());
+// if the new sections were not updated by resizing, we need to update now
+if (!d->hasAutoResizeSections())
+d->viewport->update();
+}
+/*!
+This slot is called when sections are removed from the \a parent.
+\a logicalFirst and \a logicalLast signify where the sections were removed.
+If only one section is removed, \a logicalFirst and \a logicalLast will
+be the same.
+*/
+void QHeaderView::sectionsAboutToBeRemoved(const QModelIndex &parent,
+int logicalFirst, int logicalLast)
+{
+Q_UNUSED(parent);
+Q_UNUSED(logicalFirst);
+Q_UNUSED(logicalLast);
+}
+void QHeaderViewPrivate::updateHiddenSections(int logicalFirst, int logicalLast)
+{
+Q_Q(QHeaderView);
+const int changeCount = logicalLast - logicalFirst + 1;
+// remove sections from hiddenSectionSize
+QHash<int, int> newHiddenSectionSize; // from logical index to section size
+for (int i = 0; i < logicalFirst; ++i)
+if (q->isSectionHidden(i))
+newHiddenSectionSize[i] = hiddenSectionSize[i];
+for (int j = logicalLast + 1; j < sectionCount; ++j)
+if (q->isSectionHidden(j))
+newHiddenSectionSize[j - changeCount] = hiddenSectionSize[j];
+hiddenSectionSize = newHiddenSectionSize;
+// remove sections from sectionsHidden
+if (!sectionHidden.isEmpty()) {
+const int newsize = qMin(sectionCount - changeCount, sectionHidden.size());
+QBitArray newSectionHidden(newsize);
+for (int j = 0, k = 0; j < sectionHidden.size(); ++j) {
+const int logical = logicalIndex(j);
+if (logical < logicalFirst || logical > logicalLast) {
+newSectionHidden[k++] = sectionHidden[j];
+}
+}
+sectionHidden = newSectionHidden;
+}
+}
+void QHeaderViewPrivate::_q_sectionsRemoved(const QModelIndex &parent,
+int logicalFirst, int logicalLast)
+{
+Q_Q(QHeaderView);
+if (parent != root)
+return; // we only handle changes in the top level
+if (qMin(logicalFirst, logicalLast) < 0
+|| qMax(logicalLast, logicalFirst) >= sectionCount)
+return;
+int oldCount = q->count();
+int changeCount = logicalLast - logicalFirst + 1;
+updateHiddenSections(logicalFirst, logicalLast);
+if (visualIndices.isEmpty() && logicalIndices.isEmpty()) {
+//Q_ASSERT(headerSectionCount() == sectionCount);
+removeSectionsFromSpans(logicalFirst, logicalLast);
+} else {
+for (int l = logicalLast; l >= logicalFirst; --l) {
+int visual = visualIndices.at(l);
+for (int v = 0; v < sectionCount; ++v) {
+if (v >= logicalIndices.count())
+continue; // the section doesn't exist
+if (v > visual) {
+int logical = logicalIndices.at(v);
+--(visualIndices[logical]);
+}
+if (logicalIndex(v) > l) // no need to move the positions before l
+--(logicalIndices[v]);
+}
+logicalIndices.remove(visual);
+visualIndices.remove(l);
+//Q_ASSERT(headerSectionCount() == sectionCount);
+removeSectionsFromSpans(visual, visual);
+}
+// ### handle sectionSelection, sectionHidden
+}
+sectionCount -= changeCount;
+// update sorting column
+if (sortIndicatorSection >= logicalFirst) {
+if (sortIndicatorSection <= logicalLast)
+sortIndicatorSection = -1;
+else
+sortIndicatorSection -= changeCount;
+}
+// if we only have the last section (the "end" position) left, the header is empty
+if (sectionCount <= 0)
+clear();
+invalidateCachedSizeHint();
+emit q->sectionCountChanged(oldCount, q->count());
+viewport->update();
+}
+void QHeaderViewPrivate::_q_layoutAboutToBeChanged()
+{
+//if there is no row/column we can't have mapping for columns
+//because no QModelIndex in the model would be valid
+// ### this is far from being bullet-proof and we would need a real system to
+// ### map columns or rows persistently
+if ((orientation == Qt::Horizontal && model->rowCount(root) == 0)
+|| model->columnCount(root) == 0)
+return;
+for (int i = 0; i < sectionHidden.count(); ++i)
+if (sectionHidden.testBit(i)) // ### note that we are using column or row 0
+persistentHiddenSections.append(orientation == Qt::Horizontal
+? model->index(0, logicalIndex(i), root)
+: model->index(logicalIndex(i), 0, root));
+}
+void QHeaderViewPrivate::_q_layoutChanged()
+{
+Q_Q(QHeaderView);
+viewport->update();
+if (persistentHiddenSections.isEmpty() || modelIsEmpty()) {
+if (modelSectionCount() != sectionCount)
+q->initializeSections();
+persistentHiddenSections.clear();
+return;
+}
+bool sectionCountChanged = false;
+for (int i = 0; i < sectionHidden.count(); ++i) {
+if (sectionHidden.testBit(i))
+q->setSectionHidden(logicalIndex(i), false);
+}
+for (int i = 0; i < persistentHiddenSections.count(); ++i) {
+QModelIndex index = persistentHiddenSections.at(i);
+if (index.isValid()) {
+const int logical = (orientation == Qt::Horizontal
+? index.column()
+: index.row());
+q->setSectionHidden(logical, true);
+} else if (!sectionCountChanged && (modelSectionCount() != sectionCount)) {
+sectionCountChanged = true;
+break;
+}
+}
+persistentHiddenSections.clear();
+// the number of sections changed; we need to reread the state of the model
+if (sectionCountChanged)
+q->initializeSections();
+}
+/*!
+\internal
+*/
+void QHeaderView::initializeSections()
+{
+Q_D(QHeaderView);
+const int oldCount = d->sectionCount;
+const int newCount = d->modelSectionCount();
+if (newCount <= 0) {
+d->clear();
+emit sectionCountChanged(oldCount, 0);
+} else if (newCount != oldCount) {
+const int min = qBound(0, oldCount, newCount - 1);
+initializeSections(min, newCount - 1);
+if (stretchLastSection()) // we've already gotten the size hint
+d->lastSectionSize = sectionSize(logicalIndex(d->sectionCount - 1));
+//make sure we update the hidden sections
+if (newCount < oldCount)
+d->updateHiddenSections(0, newCount-1);
+}
+}
+/*!
+\internal
+*/
+void QHeaderView::initializeSections(int start, int end)
+{
+Q_D(QHeaderView);
+Q_ASSERT(start >= 0);
+Q_ASSERT(end >= 0);
+d->executePostedLayout();
+d->invalidateCachedSizeHint();
+if (end + 1 < d->sectionCount) {
+int newCount = end + 1;
+d->removeSectionsFromSpans(newCount, d->sectionCount);
+if (!d->hiddenSectionSize.isEmpty()) {
+if (d->sectionCount - newCount > d->hiddenSectionSize.count()) {
+for (int i = end + 1; i < d->sectionCount; ++i)
+d->hiddenSectionSize.remove(i);
+} else {
+QHash<int, int>::iterator it = d->hiddenSectionSize.begin();
+while (it != d->hiddenSectionSize.end()) {
+if (it.key() > end)
+it = d->hiddenSectionSize.erase(it);
+else
+++it;
+}
+}
+}
+}
+int oldCount = d->sectionCount;
+d->sectionCount = end + 1;
+if (!d->logicalIndices.isEmpty()) {
+d->logicalIndices.resize(d->sectionCount);
+d->visualIndices.resize(d->sectionCount);
+for (int i = start; i < d->sectionCount; ++i){
+d->logicalIndices[i] = i;
+d->visualIndices[i] = i;
+}
+}
+if (d->globalResizeMode == Stretch)
+d->stretchSections = d->sectionCount;
+else if (d->globalResizeMode == ResizeToContents)
+d->contentsSections = d->sectionCount;
+if (!d->sectionHidden.isEmpty())
+d->sectionHidden.resize(d->sectionCount);
+if (d->sectionCount > oldCount)
+d->createSectionSpan(start, end, (end - start + 1) * d->defaultSectionSize, d->globalResizeMode);
+//Q_ASSERT(d->headerLength() == d->length);
+if (d->sectionCount != oldCount)
+emit sectionCountChanged(oldCount,  d->sectionCount);
+d->viewport->update();
+}
+/*!
+\reimp
+*/
+void QHeaderView::currentChanged(const QModelIndex &current, const QModelIndex &old)
+{
+Q_D(QHeaderView);
+if (d->orientation == Qt::Horizontal && current.column() != old.column()) {
+if (old.isValid() && old.parent() == d->root)
+d->viewport->update(QRect(sectionViewportPosition(old.column()), 0,
+sectionSize(old.column()), d->viewport->height()));
+if (current.isValid() && current.parent() == d->root)
+d->viewport->update(QRect(sectionViewportPosition(current.column()), 0,
+sectionSize(current.column()), d->viewport->height()));
+} else if (d->orientation == Qt::Vertical && current.row() != old.row()) {
+if (old.isValid() && old.parent() == d->root)
+d->viewport->update(QRect(0, sectionViewportPosition(old.row()),
+d->viewport->width(), sectionSize(old.row())));
+if (current.isValid() && current.parent() == d->root)
+d->viewport->update(QRect(0, sectionViewportPosition(current.row()),
+d->viewport->width(), sectionSize(current.row())));
+}
+}
+/*!
+\reimp
+*/
+bool QHeaderView::event(QEvent *e)
+{
+Q_D(QHeaderView);
+switch (e->type()) {
+case QEvent::HoverEnter: {
+QHoverEvent *he = static_cast<QHoverEvent*>(e);
+d->hover = logicalIndexAt(he->pos());
+if (d->hover != -1)
+updateSection(d->hover);
+break; }
+case QEvent::Leave:
+case QEvent::HoverLeave: {
+if (d->hover != -1)
+updateSection(d->hover);
+d->hover = -1;
+break; }
+case QEvent::HoverMove: {
+QHoverEvent *he = static_cast<QHoverEvent*>(e);
+int oldHover = d->hover;
+d->hover = logicalIndexAt(he->pos());
+if (d->hover != oldHover) {
+if (oldHover != -1)
+updateSection(oldHover);
+if (d->hover != -1)
+updateSection(d->hover);
+}
+break; }
+case QEvent::Timer: { // ### reimplement timerEvent() instead ?
+QTimerEvent *te = static_cast<QTimerEvent*>(e);
+if (te->timerId() == d->delayedResize.timerId()) {
+d->delayedResize.stop();
+resizeSections();
+}
+break; }
+default:
+break;
+}
+return QAbstractItemView::event(e);
+}
+/*!
+\reimp
+*/
+void QHeaderView::paintEvent(QPaintEvent *e)
+{
+Q_D(QHeaderView);
+if (count() == 0)
+return;
+QPainter painter(d->viewport);
+const QPoint offset = d->scrollDelayOffset;
+QRect translatedEventRect = e->rect();
+translatedEventRect.translate(offset);
+int start = -1;
+int end = -1;
+if (d->orientation == Qt::Horizontal) {
+start = visualIndexAt(translatedEventRect.left());
+end = visualIndexAt(translatedEventRect.right());
+} else {
+start = visualIndexAt(translatedEventRect.top());
+end = visualIndexAt(translatedEventRect.bottom());
+}
+if (d->reverse()) {
+start = (start == -1 ? count() - 1 : start);
+end = (end == -1 ? 0 : end);
+} else {
+start = (start == -1 ? 0 : start);
+end = (end == -1 ? count() - 1 : end);
+}
+int tmp = start;
+start = qMin(start, end);
+end = qMax(tmp, end);
+d->prepareSectionSelected(); // clear and resize the bit array
+QRect currentSectionRect;
+int logical;
+const int width = d->viewport->width();
+const int height = d->viewport->height();
+for (int i = start; i <= end; ++i) {
+if (d->isVisualIndexHidden(i))
+continue;
+painter.save();
+logical = logicalIndex(i);
+if (d->orientation == Qt::Horizontal) {
+currentSectionRect.setRect(sectionViewportPosition(logical), 0, sectionSize(logical), height);
+} else {
+currentSectionRect.setRect(0, sectionViewportPosition(logical), width, sectionSize(logical));
+}
+currentSectionRect.translate(offset);
+QVariant variant = d->model->headerData(logical, d->orientation,
+Qt::FontRole);
+if (variant.isValid() && qVariantCanConvert<QFont>(variant)) {
+QFont sectionFont = qvariant_cast<QFont>(variant);
+painter.setFont(sectionFont);
+}
+paintSection(&painter, currentSectionRect, logical);
+painter.restore();
+}
+QStyleOption opt;
+opt.init(this);
+// Paint the area beyond where there are indexes
+if (d->reverse()) {
+opt.state |= QStyle::State_Horizontal;
+if (currentSectionRect.left() > translatedEventRect.left()) {
+opt.rect = QRect(translatedEventRect.left(), 0,
+currentSectionRect.left() - translatedEventRect.left(), height);
+style()->drawControl(QStyle::CE_HeaderEmptyArea, &opt, &painter, this);
+}
+} else if (currentSectionRect.right() < translatedEventRect.right()) {
+// paint to the right
+opt.state |= QStyle::State_Horizontal;
+opt.rect = QRect(currentSectionRect.right() + 1, 0,
+translatedEventRect.right() - currentSectionRect.right(), height);
+style()->drawControl(QStyle::CE_HeaderEmptyArea, &opt, &painter, this);
+} else if (currentSectionRect.bottom() < translatedEventRect.bottom()) {
+// paint the bottom section
+opt.state &= ~QStyle::State_Horizontal;
+opt.rect = QRect(0, currentSectionRect.bottom() + 1,
+width, height - currentSectionRect.bottom() - 1);
+style()->drawControl(QStyle::CE_HeaderEmptyArea, &opt, &painter, this);
+}
+#if 0
+// ### visualize section spans
+for (int a = 0, i = 0; i < d->sectionSpans.count(); ++i) {
+QColor color((i & 4 ? 255 : 0), (i & 2 ? 255 : 0), (i & 1 ? 255 : 0));
+if (d->orientation == Qt::Horizontal)
+painter.fillRect(a - d->offset, 0, d->sectionSpans.at(i).size, 4, color);
+else
+painter.fillRect(0, a - d->offset, 4, d->sectionSpans.at(i).size, color);
+a += d->sectionSpans.at(i).size;
+}
+#endif
+}
+/*!
+\reimp
+*/
+void QHeaderView::mousePressEvent(QMouseEvent *e)
+{
+Q_D(QHeaderView);
+if (d->state != QHeaderViewPrivate::NoState || e->button() != Qt::LeftButton)
+return;
+int pos = d->orientation == Qt::Horizontal ? e->x() : e->y();
+int handle = d->sectionHandleAt(pos);
+d->originalSize = -1; // clear the stored original size
+if (handle == -1) {
+d->pressed = logicalIndexAt(pos);
+if (d->clickableSections)
+emit sectionPressed(d->pressed);
+if (d->movableSections) {
+d->section = d->target = d->pressed;
+if (d->section == -1)
+return;
+d->state = QHeaderViewPrivate::MoveSection;
+d->setupSectionIndicator(d->section, pos);
+} else if (d->clickableSections && d->pressed != -1) {
+updateSection(d->pressed);
+d->state = QHeaderViewPrivate::SelectSections;
+}
+} else if (resizeMode(handle) == Interactive) {
+d->originalSize = sectionSize(handle);
+d->state = QHeaderViewPrivate::ResizeSection;
+d->section = handle;
+}
+d->firstPos = pos;
+d->lastPos = pos;
+d->clearCascadingSections();
+}
+/*!
+\reimp
+*/
+void QHeaderView::mouseMoveEvent(QMouseEvent *e)
+{
+Q_D(QHeaderView);
+int pos = d->orientation == Qt::Horizontal ? e->x() : e->y();
+if (pos < 0)
+return;
+if (e->buttons() == Qt::NoButton) {
+d->state = QHeaderViewPrivate::NoState;
+d->pressed = -1;
+}
+switch (d->state) {
+case QHeaderViewPrivate::ResizeSection: {
+Q_ASSERT(d->originalSize != -1);
+if (d->cascadingResizing) {
+int delta = d->reverse() ? d->lastPos - pos : pos - d->lastPos;
+int visual = visualIndex(d->section);
+d->cascadingResize(visual, d->headerSectionSize(visual) + delta);
+} else {
+int delta = d->reverse() ? d->firstPos - pos : pos - d->firstPos;
+resizeSection(d->section, qMax(d->originalSize + delta, minimumSectionSize()));
+}
+d->lastPos = pos;
+return;
+}
+case QHeaderViewPrivate::MoveSection: {
+if (qAbs(pos - d->firstPos) >= QApplication::startDragDistance()) {
+int indicatorCenter = (d->orientation == Qt::Horizontal
+? d->sectionIndicator->width()
+: d->sectionIndicator->height()) / 2;
+int centerOffset = indicatorCenter - d->sectionIndicatorOffset;
+// This will drop the moved section to the position under the center of the indicator.
+// If centerOffset is 0, the section will be moved to the position of the mouse cursor.
+int visual = visualIndexAt(pos + centerOffset);
+if (visual == -1)
+return;
+d->target = d->logicalIndex(visual);
+d->updateSectionIndicator(d->section, pos);
+} else {
+int visual = visualIndexAt(d->firstPos);
+if (visual == -1)
+return;
+d->target = d->logicalIndex(visual);
+d->updateSectionIndicator(d->section, d->firstPos);
+}
+return;
+}
+case QHeaderViewPrivate::SelectSections: {
+int logical = logicalIndexAt(pos);
+if (logical == d->pressed)
+return; // nothing to do
+else if (d->pressed != -1)
+updateSection(d->pressed);
+d->pressed = logical;
+if (d->clickableSections && logical != -1) {
+emit sectionEntered(d->pressed);
+updateSection(d->pressed);
+}
+return;
+}
+case QHeaderViewPrivate::NoState: {
+#ifndef QT_NO_CURSOR
+int handle = d->sectionHandleAt(pos);
+bool hasCursor = testAttribute(Qt::WA_SetCursor);
+if (handle != -1 && (resizeMode(handle) == Interactive)) {
+if (!hasCursor)
+setCursor(d->orientation == Qt::Horizontal ? Qt::SplitHCursor : Qt::SplitVCursor);
+} else if (hasCursor) {
+unsetCursor();
+}
+#endif
+return;
+}
+default:
+break;
+}
+}
+/*!
+\reimp
+*/
+void QHeaderView::mouseReleaseEvent(QMouseEvent *e)
+{
+Q_D(QHeaderView);
+int pos = d->orientation == Qt::Horizontal ? e->x() : e->y();
+switch (d->state) {
+case QHeaderViewPrivate::MoveSection:
+if (!d->sectionIndicator->isHidden()) { // moving
+int from = visualIndex(d->section);
+Q_ASSERT(from != -1);
+int to = visualIndex(d->target);
+Q_ASSERT(to != -1);
+moveSection(from, to);
+d->section = d->target = -1;
+d->updateSectionIndicator(d->section, pos);
+break;
+} // not moving
+case QHeaderViewPrivate::SelectSections:
+if (!d->clickableSections) {
+int section = logicalIndexAt(pos);
+updateSection(section);
+}
+// fall through
+case QHeaderViewPrivate::NoState:
+if (d->clickableSections) {
+int section = logicalIndexAt(pos);
+if (section != -1 && section == d->pressed) {
+d->flipSortIndicator(section);
+emit sectionClicked(logicalIndexAt(pos));
+}
+if (d->pressed != -1)
+updateSection(d->pressed);
+}
+break;
+case QHeaderViewPrivate::ResizeSection:
+d->originalSize = -1;
+d->clearCascadingSections();
+break;
+default:
+break;
+}
+d->state = QHeaderViewPrivate::NoState;
+d->pressed = -1;
+}
+/*!
+\reimp
+*/
+void QHeaderView::mouseDoubleClickEvent(QMouseEvent *e)
+{
+Q_D(QHeaderView);
+int pos = d->orientation == Qt::Horizontal ? e->x() : e->y();
+int handle = d->sectionHandleAt(pos);
+if (handle > -1 && resizeMode(handle) == Interactive) {
+emit sectionHandleDoubleClicked(handle);
+#ifndef QT_NO_CURSOR
+Qt::CursorShape splitCursor = (d->orientation == Qt::Horizontal)
+? Qt::SplitHCursor : Qt::SplitVCursor;
+if (cursor().shape() == splitCursor) {
+// signal handlers may have changed the section size
+handle = d->sectionHandleAt(pos);
+if (!(handle > -1 && resizeMode(handle) == Interactive))
+setCursor(Qt::ArrowCursor);
+}
+#endif
+} else {
+emit sectionDoubleClicked(logicalIndexAt(e->pos()));
+}
+}
+/*!
+\reimp
+*/
+bool QHeaderView::viewportEvent(QEvent *e)
+{
+Q_D(QHeaderView);
+switch (e->type()) {
+#ifndef QT_NO_TOOLTIP
+case QEvent::ToolTip: {
+QHelpEvent *he = static_cast<QHelpEvent*>(e);
+int logical = logicalIndexAt(he->pos());
+if (logical != -1) {
+QVariant variant = d->model->headerData(logical, d->orientation, Qt::ToolTipRole);
+if (variant.isValid()) {
+QToolTip::showText(he->globalPos(), variant.toString(), this);
+return true;
+}
+}
+break; }
+#endif
+#ifndef QT_NO_WHATSTHIS
+case QEvent::QueryWhatsThis: {
+QHelpEvent *he = static_cast<QHelpEvent*>(e);
+int logical = logicalIndexAt(he->pos());
+if (logical != -1
+&& d->model->headerData(logical, d->orientation, Qt::WhatsThisRole).isValid())
+return true;
+break; }
+case QEvent::WhatsThis: {
+QHelpEvent *he = static_cast<QHelpEvent*>(e);
+int logical = logicalIndexAt(he->pos());
+if (logical != -1) {
+QVariant whatsthis = d->model->headerData(logical, d->orientation,
+Qt::WhatsThisRole);
+if (whatsthis.isValid()) {
+QWhatsThis::showText(he->globalPos(), whatsthis.toString(), this);
+return true;
+}
+}
+break; }
+#endif // QT_NO_WHATSTHIS
+#ifndef QT_NO_STATUSTIP
+case QEvent::StatusTip: {
+QHelpEvent *he = static_cast<QHelpEvent*>(e);
+int logical = logicalIndexAt(he->pos());
+if (logical != -1) {
+QString statustip = d->model->headerData(logical, d->orientation,
+Qt::StatusTipRole).toString();
+if (!statustip.isEmpty())
+setStatusTip(statustip);
+}
+return true; }
+#endif // QT_NO_STATUSTIP
+case QEvent::Hide:
+case QEvent::Show:
+case QEvent::FontChange:
+case QEvent::StyleChange:
+d->invalidateCachedSizeHint();
+resizeSections();
+emit geometriesChanged();
+break;
+case QEvent::ContextMenu: {
+d->state = QHeaderViewPrivate::NoState;
+d->pressed = d->section = d->target = -1;
+d->updateSectionIndicator(d->section, -1);
+}
+default:
+break;
+}
+return QAbstractItemView::viewportEvent(e);
+}
+/*!
+Paints the section specified by the given \a logicalIndex, using the given
+\a painter and \a rect.
+Normally, you do not have to call this function.
+*/
+void QHeaderView::paintSection(QPainter *painter, const QRect &rect, int logicalIndex) const
+{
+Q_D(const QHeaderView);
+if (!rect.isValid())
+return;
+// get the state of the section
+QStyleOptionHeader opt;
+initStyleOption(&opt);
+QStyle::State state = QStyle::State_None;
+if (isEnabled())
+state |= QStyle::State_Enabled;
+if (window()->isActiveWindow())
+state |= QStyle::State_Active;
+if (d->clickableSections) {
+if (logicalIndex == d->hover)
+state |= QStyle::State_MouseOver;
+if (logicalIndex == d->pressed)
+state |= QStyle::State_Sunken;
+else if (d->highlightSelected) {
+if (d->sectionIntersectsSelection(logicalIndex))
+state |= QStyle::State_On;
+if (d->isSectionSelected(logicalIndex))
+state |= QStyle::State_Sunken;
+}
+}
+if (isSortIndicatorShown() && sortIndicatorSection() == logicalIndex)
+opt.sortIndicator = (sortIndicatorOrder() == Qt::AscendingOrder)
+? QStyleOptionHeader::SortDown : QStyleOptionHeader::SortUp;
+// setup the style options structure
+QVariant textAlignment = d->model->headerData(logicalIndex, d->orientation,
+Qt::TextAlignmentRole);
+opt.rect = rect;
+opt.section = logicalIndex;
+opt.state |= state;
+opt.textAlignment = Qt::Alignment(textAlignment.isValid()
+? Qt::Alignment(textAlignment.toInt())
+: d->defaultAlignment);
+opt.iconAlignment = Qt::AlignVCenter;
+opt.text = d->model->headerData(logicalIndex, d->orientation,
+Qt::DisplayRole).toString();
+if (d->textElideMode != Qt::ElideNone)
+opt.text = opt.fontMetrics.elidedText(opt.text, d->textElideMode , rect.width() - 4);
+QVariant variant = d->model->headerData(logicalIndex, d->orientation,
+Qt::DecorationRole);
+opt.icon = qvariant_cast<QIcon>(variant);
+if (opt.icon.isNull())
+opt.icon = qvariant_cast<QPixmap>(variant);
+QVariant foregroundBrush = d->model->headerData(logicalIndex, d->orientation,
+Qt::ForegroundRole);
+if (qVariantCanConvert<QBrush>(foregroundBrush))
+opt.palette.setBrush(QPalette::ButtonText, qvariant_cast<QBrush>(foregroundBrush));
+QPointF oldBO = painter->brushOrigin();
+QVariant backgroundBrush = d->model->headerData(logicalIndex, d->orientation,
+Qt::BackgroundRole);
+if (qVariantCanConvert<QBrush>(backgroundBrush)) {
+opt.palette.setBrush(QPalette::Button, qvariant_cast<QBrush>(backgroundBrush));
+opt.palette.setBrush(QPalette::Window, qvariant_cast<QBrush>(backgroundBrush));
+painter->setBrushOrigin(opt.rect.topLeft());
+}
+// the section position
+int visual = visualIndex(logicalIndex);
+Q_ASSERT(visual != -1);
+if (count() == 1)
+opt.position = QStyleOptionHeader::OnlyOneSection;
+else if (visual == 0)
+opt.position = QStyleOptionHeader::Beginning;
+else if (visual == count() - 1)
+opt.position = QStyleOptionHeader::End;
+else
+opt.position = QStyleOptionHeader::Middle;
+opt.orientation = d->orientation;
+// the selected position
+bool previousSelected = d->isSectionSelected(this->logicalIndex(visual - 1));
+bool nextSelected =  d->isSectionSelected(this->logicalIndex(visual + 1));
+if (previousSelected && nextSelected)
+opt.selectedPosition = QStyleOptionHeader::NextAndPreviousAreSelected;
+else if (previousSelected)
+opt.selectedPosition = QStyleOptionHeader::PreviousIsSelected;
+else if (nextSelected)
+opt.selectedPosition = QStyleOptionHeader::NextIsSelected;
+else
+opt.selectedPosition = QStyleOptionHeader::NotAdjacent;
+// draw the section
+style()->drawControl(QStyle::CE_Header, &opt, painter, this);
+painter->setBrushOrigin(oldBO);
+}
+/*!
+Returns the size of the contents of the section specified by the given
+\a logicalIndex.
+\sa defaultSectionSize()
+*/
+QSize QHeaderView::sectionSizeFromContents(int logicalIndex) const
+{
+Q_D(const QHeaderView);
+Q_ASSERT(logicalIndex >= 0);
+// use SizeHintRole
+QVariant variant = d->model->headerData(logicalIndex, d->orientation, Qt::SizeHintRole);
+if (variant.isValid())
+return qvariant_cast<QSize>(variant);
+// otherwise use the contents
+QStyleOptionHeader opt;
+initStyleOption(&opt);
+opt.section = logicalIndex;
+QVariant var = d->model->headerData(logicalIndex, d->orientation,
+Qt::FontRole);
+QFont fnt;
+if (var.isValid() && qVariantCanConvert<QFont>(var))
+fnt = qvariant_cast<QFont>(var);
+else
+fnt = font();
+fnt.setBold(true);
+opt.fontMetrics = QFontMetrics(fnt);
+opt.text = d->model->headerData(logicalIndex, d->orientation,
+Qt::DisplayRole).toString();
+variant = d->model->headerData(logicalIndex, d->orientation, Qt::DecorationRole);
+opt.icon = qvariant_cast<QIcon>(variant);
+if (opt.icon.isNull())
+opt.icon = qvariant_cast<QPixmap>(variant);
+QSize size = style()->sizeFromContents(QStyle::CT_HeaderSection, &opt, QSize(), this);
+if (isSortIndicatorShown()) {
+int margin = style()->pixelMetric(QStyle::PM_HeaderMargin, &opt, this);
+if (d->orientation == Qt::Horizontal)
+size.rwidth() += size.height() + margin;
+else
+size.rheight() += size.width() + margin;
+}
+return size;
+}
+/*!
+Returns the horizontal offset of the header. This is 0 for vertical
+headers.
+\sa offset()
+*/
+int QHeaderView::horizontalOffset() const
+{
+Q_D(const QHeaderView);
+if (d->orientation == Qt::Horizontal)
+return d->offset;
+return 0;
+}
+/*!
+Returns the vertical offset of the header. This is 0 for horizontal
+headers.
+\sa offset()
+*/
+int QHeaderView::verticalOffset() const
+{
+Q_D(const QHeaderView);
+if (d->orientation == Qt::Vertical)
+return d->offset;
+return 0;
+}
+/*!
+\reimp
+\internal
+*/
+void QHeaderView::updateGeometries()
+{
+Q_D(QHeaderView);
+d->layoutChildren();
+if (d->hasAutoResizeSections())
+resizeSections();
+}
+/*!
+\reimp
+\internal
+*/
+void QHeaderView::scrollContentsBy(int dx, int dy)
+{
+Q_D(QHeaderView);
+d->scrollDirtyRegion(dx, dy);
+}
+/*!
+\reimp
+\internal
+*/
+void QHeaderView::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
+{
+Q_D(QHeaderView);
+d->invalidateCachedSizeHint();
+if (d->hasAutoResizeSections()) {
+bool resizeRequired = d->globalResizeMode == ResizeToContents;
+int first = orientation() == Qt::Horizontal ? topLeft.column() : topLeft.row();
+int last = orientation() == Qt::Horizontal ? bottomRight.column() : bottomRight.row();
+for (int i = first; i <= last && !resizeRequired; ++i)
+resizeRequired = (resizeMode(i) == ResizeToContents);
+if (resizeRequired)
+d->doDelayedResizeSections();
+}
+}
+/*!
+\reimp
+\internal
+Empty implementation because the header doesn't show QModelIndex items.
+*/
+void QHeaderView::rowsInserted(const QModelIndex &, int, int)
+{
+// do nothing
+}
+/*!
+\reimp
+\internal
+Empty implementation because the header doesn't show QModelIndex items.
+*/
+QRect QHeaderView::visualRect(const QModelIndex &) const
+{
+return QRect();
+}
+/*!
+\reimp
+\internal
+Empty implementation because the header doesn't show QModelIndex items.
+*/
+void QHeaderView::scrollTo(const QModelIndex &, ScrollHint)
+{
+// do nothing - the header only displays sections
+}
+/*!
+\reimp
+\internal
+Empty implementation because the header doesn't show QModelIndex items.
+*/
+QModelIndex QHeaderView::indexAt(const QPoint &) const
+{
+return QModelIndex();
+}
+/*!
+\reimp
+\internal
+Empty implementation because the header doesn't show QModelIndex items.
+*/
+bool QHeaderView::isIndexHidden(const QModelIndex &) const
+{
+return true; // the header view has no items, just sections
+}
+/*!
+\reimp
+\internal
+Empty implementation because the header doesn't show QModelIndex items.
+*/
+QModelIndex QHeaderView::moveCursor(CursorAction, Qt::KeyboardModifiers)
+{
+return QModelIndex();
+}
+/*!
+\reimp
+Selects the items in the given \a rect according to the specified
+\a flags.
+The base class implementation does nothing.
+*/
+void QHeaderView::setSelection(const QRect&, QItemSelectionModel::SelectionFlags)
+{
+// do nothing
+}
+/*!
+\internal
+*/
+QRegion QHeaderView::visualRegionForSelection(const QItemSelection &selection) const
+{
+Q_D(const QHeaderView);
+const int max = d->modelSectionCount();
+if (d->orientation == Qt::Horizontal) {
+int left = max;
+int right = 0;
+int rangeLeft, rangeRight;
+for (int i = 0; i < selection.count(); ++i) {
+QItemSelectionRange r = selection.at(i);
+if (r.parent().isValid() || !r.isValid())
+continue; // we only know about toplevel items and we don't want invalid ranges
+// FIXME an item inside the range may be the leftmost or rightmost
+rangeLeft = visualIndex(r.left());
+if (rangeLeft == -1) // in some cases users may change the selections
+continue;        // before we have a chance to do the layout
+rangeRight = visualIndex(r.right());
+if (rangeRight == -1) // in some cases users may change the selections
+continue;         // before we have a chance to do the layout
+if (rangeLeft < left)
+left = rangeLeft;
+if (rangeRight > right)
+right = rangeRight;
+}
+int logicalLeft = logicalIndex(left);
+int logicalRight = logicalIndex(right);
+if (logicalLeft < 0  || logicalLeft >= count() ||
+logicalRight < 0 || logicalRight >= count())
+return QRegion();
+int leftPos = sectionViewportPosition(logicalLeft);
+int rightPos = sectionViewportPosition(logicalRight);
+rightPos += sectionSize(logicalRight);
+return QRect(leftPos, 0, rightPos - leftPos, height());
+}
+// orientation() == Qt::Vertical
+int top = max;
+int bottom = 0;
+int rangeTop, rangeBottom;
+for (int i = 0; i < selection.count(); ++i) {
+QItemSelectionRange r = selection.at(i);
+if (r.parent().isValid() || !r.isValid())
+continue; // we only know about toplevel items
+// FIXME an item inside the range may be the leftmost or rightmost
+rangeTop = visualIndex(r.top());
+if (rangeTop == -1) // in some cases users may change the selections
+continue;       // before we have a chance to do the layout
+rangeBottom = visualIndex(r.bottom());
+if (rangeBottom == -1) // in some cases users may change the selections
+continue;          // before we have a chance to do the layout
+if (rangeTop < top)
+top = rangeTop;
+if (rangeBottom > bottom)
+bottom = rangeBottom;
+}
+int logicalTop = logicalIndex(top);
+int logicalBottom = logicalIndex(bottom);
+if (logicalTop == -1 || logicalBottom == -1)
+return QRect();
+int topPos = sectionViewportPosition(logicalTop);
+int bottomPos = sectionViewportPosition(logicalBottom) + sectionSize(logicalBottom);
+return QRect(0, topPos, width(), bottomPos - topPos);
+}
+// private implementation
+int QHeaderViewPrivate::sectionHandleAt(int position)
+{
+Q_Q(QHeaderView);
+int visual = q->visualIndexAt(position);
+if (visual == -1)
+return -1;
+int log = logicalIndex(visual);
+int pos = q->sectionViewportPosition(log);
+int grip = q->style()->pixelMetric(QStyle::PM_HeaderGripMargin, 0, q);
+bool atLeft = position < pos + grip;
+bool atRight = (position > pos + q->sectionSize(log) - grip);
+if (reverse())
+qSwap(atLeft, atRight);
+if (atLeft) {
+//grip at the beginning of the section
+while(visual > -1) {
+int logical = q->logicalIndex(--visual);
+if (!q->isSectionHidden(logical))
+return logical;
+}
+} else if (atRight) {
+//grip at the end of the section
+return log;
+}
+return -1;
+}
+void QHeaderViewPrivate::setupSectionIndicator(int section, int position)
+{
+Q_Q(QHeaderView);
+if (!sectionIndicator) {
+sectionIndicator = new QLabel(viewport);
+}
+int w, h;
+int p = q->sectionViewportPosition(section);
+if (orientation == Qt::Horizontal) {
+w = q->sectionSize(section);
+h = viewport->height();
+} else {
+w = viewport->width();
+h = q->sectionSize(section);
+}
+sectionIndicator->resize(w, h);
+QPixmap pm(w, h);
+pm.fill(QColor(0, 0, 0, 45));
+QRect rect(0, 0, w, h);
+QPainter painter(&pm);
+painter.setOpacity(0.75);
+q->paintSection(&painter, rect, section);
+painter.end();
+sectionIndicator->setPixmap(pm);
+sectionIndicatorOffset = position - qMax(p, 0);
+}
+void QHeaderViewPrivate::updateSectionIndicator(int section, int position)
+{
+if (!sectionIndicator)
+return;
+if (section == -1 || target == -1) {
+sectionIndicator->hide();
+return;
+}
+if (orientation == Qt::Horizontal)
+sectionIndicator->move(position - sectionIndicatorOffset, 0);
+else
+sectionIndicator->move(0, position - sectionIndicatorOffset);
+sectionIndicator->show();
+}
+/*!
+Initialize \a option with the values from this QHeaderView. This method is
+useful for subclasses when they need a QStyleOptionHeader, but do not want
+to fill in all the information themselves.
+\sa QStyleOption::initFrom()
+*/
+void QHeaderView::initStyleOption(QStyleOptionHeader *option) const
+{
+Q_D(const QHeaderView);
+option->initFrom(this);
+option->state = QStyle::State_None | QStyle::State_Raised;
+option->orientation = d->orientation;
+if (d->orientation == Qt::Horizontal)
+option->state |= QStyle::State_Horizontal;
+if (isEnabled())
+option->state |= QStyle::State_Enabled;
+option->section = 0;
+}
+bool QHeaderViewPrivate::isSectionSelected(int section) const
+{
+int i = section * 2;
+if (i < 0 || i >= sectionSelected.count())
+return false;
+if (sectionSelected.testBit(i)) // if the value was cached
+return sectionSelected.testBit(i + 1);
+bool s = false;
+if (orientation == Qt::Horizontal)
+s = isColumnSelected(section);
+else
+s = isRowSelected(section);
+sectionSelected.setBit(i + 1, s); // selection state
+sectionSelected.setBit(i, true); // cache state
+return s;
+}
+/*!
+\internal
+Returns the last visible (ie. not hidden) visual index
+*/
+int QHeaderViewPrivate::lastVisibleVisualIndex() const
+{
+Q_Q(const QHeaderView);
+for (int visual = q->count()-1; visual >= 0; --visual) {
+if (!q->isSectionHidden(q->logicalIndex(visual)))
+return visual;
+}
+//default value if no section is actually visible
+return -1;
+}
+/*!
+\internal
+Go through and resize all of the sections applying stretchLastSection,
+manualy stretches, sizes, and useGlobalMode.
+The different resize modes are:
+Interactive - the user decides the size
+Stretch - take up whatever space is left
+Fixed - the size is set programmatically outside the header
+ResizeToContentes - the size is set based on the contents of the row or column in the parent view
+The resize mode will not affect the last section if stretchLastSection is true.
+*/
+void QHeaderViewPrivate::resizeSections(QHeaderView::ResizeMode globalMode, bool useGlobalMode)
+{
+Q_Q(QHeaderView);
+//stop the timer in case it is delayed
+delayedResize.stop();
+executePostedLayout();
+if (sectionCount == 0)
+return;
+if (resizeRecursionBlock)
+return;
+resizeRecursionBlock = true;
+invalidateCachedSizeHint();
+const int lastVisibleSection = lastVisibleVisualIndex();
+// find stretchLastSection if we have it
+int stretchSection = -1;
+if (stretchLastSection && !useGlobalMode)
+stretchSection = lastVisibleVisualIndex();
+// count up the number of strected sections and how much space left for them
+int lengthToStrech = (orientation == Qt::Horizontal ? viewport->width() : viewport->height());
+int numberOfStretchedSections = 0;
+QList<int> section_sizes;
+for (int i = 0; i < sectionCount; ++i) {
+if (isVisualIndexHidden(i))
+continue;
+QHeaderView::ResizeMode resizeMode;
+if (useGlobalMode && (i != stretchSection))
+resizeMode = globalMode;
+else
+resizeMode = (i == stretchSection ? QHeaderView::Stretch : headerSectionResizeMode(i));
+if (resizeMode == QHeaderView::Stretch) {
+++numberOfStretchedSections;
+section_sizes.append(headerSectionSize(i));
+continue;
+}
+// because it isn't stretch, determine its width and remove that from lengthToStrech
+int sectionSize = 0;
+if (resizeMode == QHeaderView::Interactive || resizeMode == QHeaderView::Fixed) {
+sectionSize = headerSectionSize(i);
+} else { // resizeMode == QHeaderView::ResizeToContents
+int logicalIndex = q->logicalIndex(i);
+sectionSize = qMax(viewSectionSizeHint(logicalIndex),
+q->sectionSizeHint(logicalIndex));
+}
+section_sizes.append(sectionSize);
+lengthToStrech -= sectionSize;
+}
+// calculate the new length for all of the stretched sections
+int stretchSectionLength = -1;
+int pixelReminder = 0;
+if (numberOfStretchedSections > 0 && lengthToStrech > 0) { // we have room to stretch in
+int hintLengthForEveryStretchedSection = lengthToStrech / numberOfStretchedSections;
+stretchSectionLength = qMax(hintLengthForEveryStretchedSection, q->minimumSectionSize());
+pixelReminder = lengthToStrech % numberOfStretchedSections;
+}
+int spanStartSection = 0;
+int previousSectionLength = 0;
+QHeaderView::ResizeMode previousSectionResizeMode = QHeaderView::Interactive;
+// resize each section along the total length
+for (int i = 0; i < sectionCount; ++i) {
+int oldSectionLength = headerSectionSize(i);
+int newSectionLength = -1;
+QHeaderView::ResizeMode newSectionResizeMode = headerSectionResizeMode(i);
+if (isVisualIndexHidden(i)) {
+newSectionLength = 0;
+} else {
+QHeaderView::ResizeMode resizeMode;
+if (useGlobalMode)
+resizeMode = globalMode;
+else
+resizeMode = (i == stretchSection
+? QHeaderView::Stretch
+: newSectionResizeMode);
+if (resizeMode == QHeaderView::Stretch && stretchSectionLength != -1) {
+if (i == lastVisibleSection)
+newSectionLength = qMax(stretchSectionLength, lastSectionSize);
+else
+newSectionLength = stretchSectionLength;
+if (pixelReminder > 0) {
+newSectionLength += 1;
+--pixelReminder;
+}
+section_sizes.removeFirst();
+} else {
+newSectionLength = section_sizes.front();
+section_sizes.removeFirst();
+}
+}
+//Q_ASSERT(newSectionLength > 0);
+if ((previousSectionResizeMode != newSectionResizeMode
+|| previousSectionLength != newSectionLength) && i > 0) {
+int spanLength = (i - spanStartSection) * previousSectionLength;
+createSectionSpan(spanStartSection, i - 1, spanLength, previousSectionResizeMode);
+//Q_ASSERT(headerLength() == length);
+spanStartSection = i;
+}
+if (newSectionLength != oldSectionLength)
+emit q->sectionResized(logicalIndex(i), oldSectionLength, newSectionLength);
+previousSectionLength = newSectionLength;
+previousSectionResizeMode = newSectionResizeMode;
+}
+createSectionSpan(spanStartSection, sectionCount - 1,
+(sectionCount - spanStartSection) * previousSectionLength,
+previousSectionResizeMode);
+//Q_ASSERT(headerLength() == length);
+resizeRecursionBlock = false;
+viewport->update();
+}
+void QHeaderViewPrivate::createSectionSpan(int start, int end, int size, QHeaderView::ResizeMode mode)
+{
+// ### the code for merging spans does not merge at all opertuneties
+// ### what if the number of sections is reduced ?
+SectionSpan span(size, (end - start) + 1, mode);
+int start_section = 0;
+#ifndef QT_NO_DEBUG
+int initial_section_count = headerSectionCount(); // ### debug code
+#endif
+QList<int> spansToRemove;
+for (int i = 0; i < sectionSpans.count(); ++i) {
+int end_section = start_section + sectionSpans.at(i).count - 1;
+int section_count = sectionSpans.at(i).count;
+if (start <= start_section && end > end_section) {
+// the existing span is entirely coveded by the new span
+spansToRemove.append(i);
+} else if (start < start_section && end >= end_section) {
+// the existing span is entirely coveded by the new span
+spansToRemove.append(i);
+} else if (start == start_section && end == end_section) {
+// the new span is covered by an existin span
+length -= sectionSpans.at(i).size;
+length += size;
+sectionSpans[i].size = size;
+sectionSpans[i].resizeMode = mode;
+// ### check if we can merge the section with any of its neighbours
+removeSpans(spansToRemove);
+Q_ASSERT(initial_section_count == headerSectionCount());
+return;
+} else if (start > start_section && end < end_section) {
+if (sectionSpans.at(i).sectionSize() == span.sectionSize()
+&& sectionSpans.at(i).resizeMode == span.resizeMode) {
+Q_ASSERT(initial_section_count == headerSectionCount());
+return;
+}
+// the new span is in the middle of the old span, so we have to split it
+length -= sectionSpans.at(i).size;
+int section_size = sectionSpans.at(i).sectionSize();
+#ifndef QT_NO_DEBUG
+int span_count = sectionSpans.at(i).count;
+#endif
+QHeaderView::ResizeMode span_mode = sectionSpans.at(i).resizeMode;
+// first span
+int first_span_count = start - start_section;
+int first_span_size = section_size * first_span_count;
+sectionSpans[i].count = first_span_count;
+sectionSpans[i].size = first_span_size;
+sectionSpans[i].resizeMode = span_mode;
+length += first_span_size;
+// middle span (the new span)
+#ifndef QT_NO_DEBUG
+int mid_span_count = span.count;
+#endif
+int mid_span_size = span.size;
+sectionSpans.insert(i + 1, span);
+length += mid_span_size;
+// last span
+int last_span_count = end_section - end;
+int last_span_size = section_size * last_span_count;
+sectionSpans.insert(i + 2, SectionSpan(last_span_size, last_span_count, span_mode));
+length += last_span_size;
+Q_ASSERT(span_count == first_span_count + mid_span_count + last_span_count);
+removeSpans(spansToRemove);
+Q_ASSERT(initial_section_count == headerSectionCount());
+return;
+} else if (start > start_section && start <= end_section && end >= end_section) {
+// the new span covers the last part of the existing span
+length -= sectionSpans.at(i).size;
+int removed_count = (end_section - start + 1);
+int span_count = sectionSpans.at(i).count - removed_count;
+int section_size = sectionSpans.at(i).sectionSize();
+int span_size = section_size * span_count;
+sectionSpans[i].count = span_count;
+sectionSpans[i].size = span_size;
+length += span_size;
+if (end == end_section) {
+sectionSpans.insert(i + 1, span); // insert after
+length += span.size;
+removeSpans(spansToRemove);
+Q_ASSERT(initial_section_count == headerSectionCount());
+return;
+}
+} else if (end < end_section && end >= start_section && start <= start_section) {
+// the new span covers the first part of the existing span
+length -= sectionSpans.at(i).size;
+int removed_count = (end - start_section + 1);
+int section_size = sectionSpans.at(i).sectionSize();
+int span_count = sectionSpans.at(i).count - removed_count;
+int span_size = section_size * span_count;
+sectionSpans[i].count = span_count;
+sectionSpans[i].size = span_size;
+length += span_size;
+sectionSpans.insert(i, span); // insert before
+length += span.size;
+removeSpans(spansToRemove);
+Q_ASSERT(initial_section_count == headerSectionCount());
+return;
+}
+start_section += section_count;
+}
+// ### adding and removing _ sections_  in addition to spans
+// ### add some more checks here
+if (spansToRemove.isEmpty()) {
+if (!sectionSpans.isEmpty()
+&& sectionSpans.last().sectionSize() == span.sectionSize()
+&& sectionSpans.last().resizeMode == span.resizeMode) {
+length += span.size;
+int last = sectionSpans.count() - 1;
+sectionSpans[last].count += span.count;
+sectionSpans[last].size += span.size;
+sectionSpans[last].resizeMode = span.resizeMode;
+} else {
+length += span.size;
+sectionSpans.append(span);
+}
+} else {
+removeSpans(spansToRemove);
+length += span.size;
+sectionSpans.insert(spansToRemove.first(), span);
+//Q_ASSERT(initial_section_count == headerSectionCount());
+}
+}
+void QHeaderViewPrivate::removeSectionsFromSpans(int start, int end)
+{
+// remove sections
+int start_section = 0;
+QList<int> spansToRemove;
+for (int i = 0; i < sectionSpans.count(); ++i) {
+int end_section = start_section + sectionSpans.at(i).count - 1;
+int section_size = sectionSpans.at(i).sectionSize();
+int section_count = sectionSpans.at(i).count;
+if (start <= start_section && end >= end_section) {
+// the change covers the entire span
+spansToRemove.append(i);
+if (end == end_section)
+break;
+} else if (start > start_section && end < end_section) {
+// all the removed sections are inside the span
+int change = (end - start + 1);
+sectionSpans[i].count -= change;
+sectionSpans[i].size = section_size * sectionSpans.at(i).count;
+length -= (change * section_size);
+break;
+} else if (start >= start_section && start <= end_section) {
+// the some of the removed sections are inside the span,at the end
+int change = qMin(end_section - start + 1, end - start + 1);
+sectionSpans[i].count -= change;
+sectionSpans[i].size = section_size * sectionSpans.at(i).count;
+start += change;
+length -= (change * section_size);
+// the change affects several spans
+} else if (end >= start_section && end <= end_section) {
+// the some of the removed sections are inside the span, at the beginning
+int change = qMin((end - start_section + 1), end - start + 1);
+sectionSpans[i].count -= change;
+sectionSpans[i].size = section_size * sectionSpans.at(i).count;
+length -= (change * section_size);
+break;
+}
+start_section += section_count;
+}
+for (int i = spansToRemove.count() - 1; i >= 0; --i) {
+int s = spansToRemove.at(i);
+length -= sectionSpans.at(s).size;
+sectionSpans.remove(s);
+// ### merge remaining spans
+}
+}
+void QHeaderViewPrivate::clear()
+{
+if (state != NoClear) {
+length = 0;
+sectionCount = 0;
+visualIndices.clear();
+logicalIndices.clear();
+sectionSelected.clear();
+sectionHidden.clear();
+hiddenSectionSize.clear();
+sectionSpans.clear();
+}
+}
+void QHeaderViewPrivate::flipSortIndicator(int section)
+{
+Q_Q(QHeaderView);
+bool ascending = (sortIndicatorSection != section
+|| sortIndicatorOrder == Qt::DescendingOrder);
+q->setSortIndicator(section, ascending ? Qt::AscendingOrder : Qt::DescendingOrder);
+}
+void QHeaderViewPrivate::cascadingResize(int visual, int newSize)
+{
+Q_Q(QHeaderView);
+const int minimumSize = q->minimumSectionSize();
+const int oldSize = headerSectionSize(visual);
+int delta = newSize - oldSize;
+if (delta > 0) { // larger
+bool sectionResized = false;
+// restore old section sizes
+for (int i = firstCascadingSection; i < visual; ++i) {
+if (cascadingSectionSize.contains(i)) {
+int currentSectionSize = headerSectionSize(i);
+int originalSectionSize = cascadingSectionSize.value(i);
+if (currentSectionSize < originalSectionSize) {
+int newSectionSize = currentSectionSize + delta;
+resizeSectionSpan(i, currentSectionSize, newSectionSize);
+if (newSectionSize >= originalSectionSize && false)
+cascadingSectionSize.remove(i); // the section is now restored
+sectionResized = true;
+break;
+}
+}
+}
+// resize the section
+if (!sectionResized) {
+newSize = qMax(newSize, minimumSize);
+if (oldSize != newSize)
+resizeSectionSpan(visual, oldSize, newSize);
+}
+// cascade the section size change
+for (int i = visual + 1; i < sectionCount; ++i) {
+if (!sectionIsCascadable(i))
+continue;
+int currentSectionSize = headerSectionSize(i);
+if (currentSectionSize <= minimumSize)
+continue;
+int newSectionSize = qMax(currentSectionSize - delta, minimumSize);
+//qDebug() << "### cascading to" << i << newSectionSize - currentSectionSize << delta;
+resizeSectionSpan(i, currentSectionSize, newSectionSize);
+saveCascadingSectionSize(i, currentSectionSize);
+delta = delta - (currentSectionSize - newSectionSize);
+//qDebug() << "new delta" << delta;
+//if (newSectionSize != minimumSize)
+if (delta <= 0)
+break;
+}
+} else { // smaller
+bool sectionResized = false;
+// restore old section sizes
+for (int i = lastCascadingSection; i > visual; --i) {
+if (!cascadingSectionSize.contains(i))
+continue;
+int currentSectionSize = headerSectionSize(i);
+int originalSectionSize = cascadingSectionSize.value(i);
+if (currentSectionSize >= originalSectionSize)
+continue;
+int newSectionSize = currentSectionSize - delta;
+resizeSectionSpan(i, currentSectionSize, newSectionSize);
+if (newSectionSize >= originalSectionSize && false) {
+//qDebug() << "section" << i << "restored to" << originalSectionSize;
+cascadingSectionSize.remove(i); // the section is now restored
+}
+sectionResized = true;
+break;
+}
+// resize the section
+resizeSectionSpan(visual, oldSize, qMax(newSize, minimumSize));
+// cascade the section size change
+if (delta < 0 && newSize < minimumSize) {
+for (int i = visual - 1; i >= 0; --i) {
+if (!sectionIsCascadable(i))
+continue;
+int sectionSize = headerSectionSize(i);
+if (sectionSize <= minimumSize)
+continue;
+resizeSectionSpan(i, sectionSize, qMax(sectionSize + delta, minimumSize));
+saveCascadingSectionSize(i, sectionSize);
+break;
+}
+}
+// let the next section get the space from the resized section
+if (!sectionResized) {
+for (int i = visual + 1; i < sectionCount; ++i) {
+if (!sectionIsCascadable(i))
+continue;
+int currentSectionSize = headerSectionSize(i);
+int newSectionSize = qMax(currentSectionSize - delta, minimumSize);
+resizeSectionSpan(i, currentSectionSize, newSectionSize);
+break;
+}
+}
+}
+if (hasAutoResizeSections())
+doDelayedResizeSections();
+viewport->update();
+}
+void QHeaderViewPrivate::setDefaultSectionSize(int size)
+{
+Q_Q(QHeaderView);
+defaultSectionSize = size;
+int currentVisualIndex = 0;
+for (int i = 0; i < sectionSpans.count(); ++i) {
+QHeaderViewPrivate::SectionSpan &span = sectionSpans[i];
+if (span.size > 0) {
+//we resize it if it is not hidden (ie size > 0)
+const int newSize = span.count * size;
+if (newSize != span.size) {
+length += newSize - span.size; //the whole length is changed
+const int oldSectionSize = span.sectionSize();
+span.size = span.count * size;
+for (int i = currentVisualIndex; i < currentVisualIndex + span.count; ++i) {
+emit q->sectionResized(logicalIndex(i), oldSectionSize, size);
+}
+}
+}
+currentVisualIndex += span.count;
+}
+}
+void QHeaderViewPrivate::resizeSectionSpan(int visualIndex, int oldSize, int newSize)
+{
+Q_Q(QHeaderView);
+QHeaderView::ResizeMode mode = headerSectionResizeMode(visualIndex);
+createSectionSpan(visualIndex, visualIndex, newSize, mode);
+emit q->sectionResized(logicalIndex(visualIndex), oldSize, newSize);
+}
+int QHeaderViewPrivate::headerSectionSize(int visual) const
+{
+// ### stupid iteration
+int section_start = 0;
+const int sectionSpansCount = sectionSpans.count();
+for (int i = 0; i < sectionSpansCount; ++i) {
+const QHeaderViewPrivate::SectionSpan &currentSection = sectionSpans.at(i);
+int section_end = section_start + currentSection.count - 1;
+if (visual >= section_start && visual <= section_end)
+return currentSection.sectionSize();
+section_start = section_end + 1;
+}
+return -1;
+}
+int QHeaderViewPrivate::headerSectionPosition(int visual) const
+{
+// ### stupid iteration
+int section_start = 0;
+int span_position = 0;
+const int sectionSpansCount = sectionSpans.count();
+for (int i = 0; i < sectionSpansCount; ++i) {
+const QHeaderViewPrivate::SectionSpan &currentSection = sectionSpans.at(i);
+int section_end = section_start + currentSection.count - 1;
+if (visual >= section_start && visual <= section_end)
+return span_position + (visual - section_start) * currentSection.sectionSize();
+section_start = section_end + 1;
+span_position += currentSection.size;
+}
+return -1;
+}
+int QHeaderViewPrivate::headerVisualIndexAt(int position) const
+{
+// ### stupid iteration
+int span_start_section = 0;
+int span_position = 0;
+const int sectionSpansCount = sectionSpans.count();
+for (int i = 0; i < sectionSpansCount; ++i) {
+const QHeaderViewPrivate::SectionSpan &currentSection = sectionSpans.at(i);
+int next_span_start_section = span_start_section + currentSection.count;
+int next_span_position = span_position + currentSection.size;
+if (position == span_position)
+return span_start_section; // spans with no size
+if (position > span_position && position < next_span_position) {
+int position_in_span = position - span_position;
+return span_start_section + (position_in_span / currentSection.sectionSize());
+}
+span_start_section = next_span_start_section;
+span_position = next_span_position;
+}
+return -1;
+}
+void QHeaderViewPrivate::setHeaderSectionResizeMode(int visual, QHeaderView::ResizeMode mode)
+{
+int size = headerSectionSize(visual);
+createSectionSpan(visual, visual, size, mode);
+}
+QHeaderView::ResizeMode QHeaderViewPrivate::headerSectionResizeMode(int visual) const
+{
+int span = sectionSpanIndex(visual);
+if (span == -1)
+return globalResizeMode;
+return sectionSpans.at(span).resizeMode;
+}
+void QHeaderViewPrivate::setGlobalHeaderResizeMode(QHeaderView::ResizeMode mode)
+{
+globalResizeMode = mode;
+for (int i = 0; i < sectionSpans.count(); ++i)
+sectionSpans[i].resizeMode = mode;
+}
+int QHeaderViewPrivate::viewSectionSizeHint(int logical) const
+{
+if (QAbstractItemView *view = qobject_cast<QAbstractItemView*>(parent)) {
+return (orientation == Qt::Horizontal
+? view->sizeHintForColumn(logical)
+: view->sizeHintForRow(logical));
+}
+return 0;
+}
+int QHeaderViewPrivate::adjustedVisualIndex(int visualIndex) const
+{
+if (hiddenSectionSize.count() > 0) {
+int adjustedVisualIndex = visualIndex;
+int currentVisualIndex = 0;
+for (int i = 0; i < sectionSpans.count(); ++i) {
+if (sectionSpans.at(i).size == 0)
+adjustedVisualIndex += sectionSpans.at(i).count;
+else
+currentVisualIndex += sectionSpans.at(i).count;
+if (currentVisualIndex >= visualIndex)
+break;
+}
+visualIndex = adjustedVisualIndex;
+}
+return visualIndex;
+}
+#ifndef QT_NO_DATASTREAM
+void QHeaderViewPrivate::write(QDataStream &out) const
+{
+out << int(orientation);
+out << int(sortIndicatorOrder);
+out << sortIndicatorSection;
+out << sortIndicatorShown;
+out << visualIndices;
+out << logicalIndices;
+out << sectionHidden;
+out << hiddenSectionSize;
+out << length;
+out << sectionCount;
+out << movableSections;
+out << clickableSections;
+out << highlightSelected;
+out << stretchLastSection;
+out << cascadingResizing;
+out << stretchSections;
+out << contentsSections;
+out << defaultSectionSize;
+out << minimumSectionSize;
+out << int(defaultAlignment);
+out << int(globalResizeMode);
+out << sectionSpans;
+}
+bool QHeaderViewPrivate::read(QDataStream &in)
+{
+int orient, order, align, global;
+in >> orient;
+orientation = (Qt::Orientation)orient;
+in >> order;
+sortIndicatorOrder = (Qt::SortOrder)order;
+in >> sortIndicatorSection;
+in >> sortIndicatorShown;
+in >> visualIndices;
+in >> logicalIndices;
+in >> sectionHidden;
+in >> hiddenSectionSize;
+in >> length;
+in >> sectionCount;
+in >> movableSections;
+in >> clickableSections;
+in >> highlightSelected;
+in >> stretchLastSection;
+in >> cascadingResizing;
+in >> stretchSections;
+in >> contentsSections;
+in >> defaultSectionSize;
+in >> minimumSectionSize;
+in >> align;
+defaultAlignment = Qt::Alignment(align);
+in >> global;
+globalResizeMode = (QHeaderView::ResizeMode)global;
+in >> sectionSpans;
+return true;
+}
+#endif // QT_NO_DATASTREAM
+QT_END_NAMESPACE
+#endif // QT_NO_ITEMVIEWS
+#include "moc_qheaderview.cpp"

changeset 0	1918ee327afb
child 3	41300fa6a67c