FCL/sf/mw/qt: comparison util/src/gui/itemviews/qtreeview.cpp

equal deleted inserted replaced

-:41300fa6a67c
+:f7bc934e204c
+/****************************************************************************
+**
+** Copyright (C) 2010 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 "qtreeview.h"
+#ifndef QT_NO_TREEVIEW
+#include <qheaderview.h>
+#include <qitemdelegate.h>
+#include <qapplication.h>
+#include <qscrollbar.h>
+#include <qpainter.h>
+#include <qstack.h>
+#include <qstyle.h>
+#include <qstyleoption.h>
+#include <qevent.h>
+#include <qpen.h>
+#include <qdebug.h>
+#ifndef QT_NO_ACCESSIBILITY
+#include <qaccessible.h>
+#endif
+#include <private/qtreeview_p.h>
+QT_BEGIN_NAMESPACE
+/*!
+\class QTreeView
+\brief The QTreeView class provides a default model/view implementation of a tree view.
+\ingroup model-view
+\ingroup advanced
+A QTreeView implements a tree representation of items from a
+model. This class is used to provide standard hierarchical lists that
+were previously provided by the \c QListView class, but using the more
+flexible approach provided by Qt's model/view architecture.
+The QTreeView class is one of the \l{Model/View Classes} and is part of
+Qt's \l{Model/View Programming}{model/view framework}.
+QTreeView implements the interfaces defined by the
+QAbstractItemView class to allow it to display data provided by
+models derived from the QAbstractItemModel class.
+It is simple to construct a tree view displaying data from a
+model. In the following example, the contents of a directory are
+supplied by a QDirModel and displayed as a tree:
+\snippet doc/src/snippets/shareddirmodel/main.cpp 3
+\snippet doc/src/snippets/shareddirmodel/main.cpp 6
+The model/view architecture ensures that the contents of the tree view
+are updated as the model changes.
+Items that have children can be in an expanded (children are
+visible) or collapsed (children are hidden) state. When this state
+changes a collapsed() or expanded() signal is emitted with the
+model index of the relevant item.
+The amount of indentation used to indicate levels of hierarchy is
+controlled by the \l indentation property.
+Headers in tree views are constructed using the QHeaderView class and can
+be hidden using \c{header()->hide()}. Note that each header is configured
+with its \l{QHeaderView::}{stretchLastSection} 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.
+\section1 Key Bindings
+QTreeView supports a set of key bindings that enable the user to
+navigate in the view and interact with the contents of items:
+\table
+\header \o Key \o Action
+\row \o Up   \o Moves the cursor to the item in the same column on
+the previous row. If the parent of the current item has no more rows to
+navigate to, the cursor moves to the relevant item in the last row
+of the sibling that precedes the parent.
+\row \o Down \o Moves the cursor to the item in the same column on
+the next row. If the parent of the current item has no more rows to
+navigate to, the cursor moves to the relevant item in the first row
+of the sibling that follows the parent.
+\row \o Left  \o Hides the children of the current item (if present)
+by collapsing a branch.
+\row \o Minus  \o Same as LeftArrow.
+\row \o Right \o Reveals the children of the current item (if present)
+by expanding a branch.
+\row \o Plus  \o Same as RightArrow.
+\row \o Asterisk  \o Expands all children of the current item (if present).
+\row \o PageUp   \o Moves the cursor up one page.
+\row \o PageDown \o Moves the cursor down one page.
+\row \o Home \o Moves the cursor to an item in the same column of the first
+row of the first top-level item in the model.
+\row \o End  \o Moves the cursor to an item in the same column of the last
+row of the last top-level item in the model.
+\row \o F2   \o In editable models, this opens the current item for editing.
+The Escape key can be used to cancel the editing process and revert
+any changes to the data displayed.
+\endtable
+\omit
+Describe the expanding/collapsing concept if not covered elsewhere.
+\endomit
+\table 100%
+\row \o \inlineimage windowsxp-treeview.png Screenshot of a Windows XP style tree view
+\o \inlineimage macintosh-treeview.png Screenshot of a Macintosh style tree view
+\o \inlineimage plastique-treeview.png Screenshot of a Plastique style tree view
+\row \o A \l{Windows XP Style Widget Gallery}{Windows XP style} tree view.
+\o A \l{Macintosh Style Widget Gallery}{Macintosh style} tree view.
+\o A \l{Plastique Style Widget Gallery}{Plastique style} tree view.
+\endtable
+\section1 Improving Performance
+It is possible to give the view hints about the data it is handling in order
+to improve its performance when displaying large numbers of items. One approach
+that can be taken for views that are intended to display items with equal heights
+is to set the \l uniformRowHeights property to true.
+\sa QListView, QTreeWidget, {View Classes}, QAbstractItemModel, QAbstractItemView,
+{Dir View Example}
+*/
+/*!
+\fn void QTreeView::expanded(const QModelIndex &index)
+This signal is emitted when the item specified by \a index is expanded.
+*/
+/*!
+\fn void QTreeView::collapsed(const QModelIndex &index)
+This signal is emitted when the item specified by \a index is collapsed.
+*/
+/*!
+Constructs a tree view with a \a parent to represent a model's
+data. Use setModel() to set the model.
+\sa QAbstractItemModel
+*/
+QTreeView::QTreeView(QWidget *parent)
+: QAbstractItemView(*new QTreeViewPrivate, parent)
+{
+Q_D(QTreeView);
+d->initialize();
+}
+/*!
+\internal
+*/
+QTreeView::QTreeView(QTreeViewPrivate &dd, QWidget *parent)
+: QAbstractItemView(dd, parent)
+{
+Q_D(QTreeView);
+d->initialize();
+}
+/*!
+Destroys the tree view.
+*/
+QTreeView::~QTreeView()
+{
+}
+/*!
+\reimp
+*/
+void QTreeView::setModel(QAbstractItemModel *model)
+{
+Q_D(QTreeView);
+if (model == d->model)
+return;
+if (d->model && d->model != QAbstractItemModelPrivate::staticEmptyModel()) {
+disconnect(d->model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
+this, SLOT(rowsRemoved(QModelIndex,int,int)));
+disconnect(d->model, SIGNAL(modelAboutToBeReset()), this, SLOT(_q_modelAboutToBeReset()));
+}
+if (d->selectionModel) { // support row editing
+disconnect(d->selectionModel, SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),
+d->model, SLOT(submit()));
+disconnect(d->model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
+this, SLOT(rowsRemoved(QModelIndex,int,int)));
+disconnect(d->model, SIGNAL(modelAboutToBeReset()), this, SLOT(_q_modelAboutToBeReset()));
+}
+d->viewItems.clear();
+d->expandedIndexes.clear();
+d->hiddenIndexes.clear();
+d->header->setModel(model);
+QAbstractItemView::setModel(model);
+// QAbstractItemView connects to a private slot
+disconnect(d->model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
+this, SLOT(_q_rowsRemoved(QModelIndex,int,int)));
+// do header layout after the tree
+disconnect(d->model, SIGNAL(layoutChanged()),
+d->header, SLOT(_q_layoutChanged()));
+// QTreeView has a public slot for this
+connect(d->model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
+this, SLOT(rowsRemoved(QModelIndex,int,int)));
+connect(d->model, SIGNAL(modelAboutToBeReset()), SLOT(_q_modelAboutToBeReset()));
+if (d->sortingEnabled)
+d->_q_sortIndicatorChanged(header()->sortIndicatorSection(), header()->sortIndicatorOrder());
+}
+/*!
+\reimp
+*/
+void QTreeView::setRootIndex(const QModelIndex &index)
+{
+Q_D(QTreeView);
+d->header->setRootIndex(index);
+QAbstractItemView::setRootIndex(index);
+}
+/*!
+\reimp
+*/
+void QTreeView::setSelectionModel(QItemSelectionModel *selectionModel)
+{
+Q_D(QTreeView);
+Q_ASSERT(selectionModel);
+if (d->selectionModel) {
+// support row editing
+disconnect(d->selectionModel, SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),
+d->model, SLOT(submit()));
+}
+d->header->setSelectionModel(selectionModel);
+QAbstractItemView::setSelectionModel(selectionModel);
+if (d->selectionModel) {
+// support row editing
+connect(d->selectionModel, SIGNAL(currentRowChanged(QModelIndex,QModelIndex)),
+d->model, SLOT(submit()));
+}
+}
+/*!
+Returns the header for the tree view.
+\sa QAbstractItemModel::headerData()
+*/
+QHeaderView *QTreeView::header() const
+{
+Q_D(const QTreeView);
+return d->header;
+}
+/*!
+Sets the header for the tree view, to the given \a header.
+The view takes ownership over the given \a header and deletes it
+when a new header is set.
+\sa QAbstractItemModel::headerData()
+*/
+void QTreeView::setHeader(QHeaderView *header)
+{
+Q_D(QTreeView);
+if (header == d->header || !header)
+return;
+if (d->header && d->header->parent() == this)
+delete d->header;
+d->header = header;
+d->header->setParent(this);
+if (!d->header->model()) {
+d->header->setModel(d->model);
+if (d->selectionModel)
+d->header->setSelectionModel(d->selectionModel);
+}
+connect(d->header, SIGNAL(sectionResized(int,int,int)),
+this, SLOT(columnResized(int,int,int)));
+connect(d->header, SIGNAL(sectionMoved(int,int,int)),
+this, SLOT(columnMoved()));
+connect(d->header, SIGNAL(sectionCountChanged(int,int)),
+this, SLOT(columnCountChanged(int,int)));
+connect(d->header, SIGNAL(sectionHandleDoubleClicked(int)),
+this, SLOT(resizeColumnToContents(int)));
+connect(d->header, SIGNAL(geometriesChanged()),
+this, SLOT(updateGeometries()));
+setSortingEnabled(d->sortingEnabled);
+}
+/*!
+\property QTreeView::autoExpandDelay
+\brief The delay time before items in a tree are opened during a drag and drop operation.
+\since 4.3
+This property holds the amount of time in milliseconds that the user must wait over
+a node before that node will automatically open or close.  If the time is
+set to less then 0 then it will not be activated.
+By default, this property has a value of -1, meaning that auto-expansion is disabled.
+*/
+int QTreeView::autoExpandDelay() const
+{
+Q_D(const QTreeView);
+return d->autoExpandDelay;
+}
+void QTreeView::setAutoExpandDelay(int delay)
+{
+Q_D(QTreeView);
+d->autoExpandDelay = delay;
+}
+/*!
+\property QTreeView::indentation
+\brief indentation of the items in the tree view.
+This property holds the indentation measured in pixels of the items for each
+level in the tree view. For top-level items, the indentation specifies the
+horizontal distance from the viewport edge to the items in the first column;
+for child items, it specifies their indentation from their parent items.
+By default, this property has a value of 20.
+*/
+int QTreeView::indentation() const
+{
+Q_D(const QTreeView);
+return d->indent;
+}
+void QTreeView::setIndentation(int i)
+{
+Q_D(QTreeView);
+if (i != d->indent) {
+d->indent = i;
+d->viewport->update();
+}
+}
+/*!
+\property QTreeView::rootIsDecorated
+\brief whether to show controls for expanding and collapsing top-level items
+Items with children are typically shown with controls to expand and collapse
+them, allowing their children to be shown or hidden. If this property is
+false, these controls are not shown for top-level items. This can be used to
+make a single level tree structure appear like a simple list of items.
+By default, this property is true.
+*/
+bool QTreeView::rootIsDecorated() const
+{
+Q_D(const QTreeView);
+return d->rootDecoration;
+}
+void QTreeView::setRootIsDecorated(bool show)
+{
+Q_D(QTreeView);
+if (show != d->rootDecoration) {
+d->rootDecoration = show;
+d->viewport->update();
+}
+}
+/*!
+\property QTreeView::uniformRowHeights
+\brief whether all items in the treeview have the same height
+This property should only be set to true if it is guaranteed that all items
+in the view has the same height. This enables the view to do some
+optimizations.
+The height is obtained from the first item in the view.  It is updated
+when the data changes on that item.
+By default, this property is false.
+*/
+bool QTreeView::uniformRowHeights() const
+{
+Q_D(const QTreeView);
+return d->uniformRowHeights;
+}
+void QTreeView::setUniformRowHeights(bool uniform)
+{
+Q_D(QTreeView);
+d->uniformRowHeights = uniform;
+}
+/*!
+\property QTreeView::itemsExpandable
+\brief whether the items are expandable by the user.
+This property holds whether the user can expand and collapse items
+interactively.
+By default, this property is true.
+*/
+bool QTreeView::itemsExpandable() const
+{
+Q_D(const QTreeView);
+return d->itemsExpandable;
+}
+void QTreeView::setItemsExpandable(bool enable)
+{
+Q_D(QTreeView);
+d->itemsExpandable = enable;
+}
+/*!
+\property QTreeView::expandsOnDoubleClick
+\since 4.4
+\brief whether the items can be expanded by double-clicking.
+This property holds whether the user can expand and collapse items
+by double-clicking. The default value is true.
+\sa itemsExpandable
+*/
+bool QTreeView::expandsOnDoubleClick() const
+{
+Q_D(const QTreeView);
+return d->expandsOnDoubleClick;
+}
+void QTreeView::setExpandsOnDoubleClick(bool enable)
+{
+Q_D(QTreeView);
+d->expandsOnDoubleClick = enable;
+}
+/*!
+Returns the horizontal position of the \a column in the viewport.
+*/
+int QTreeView::columnViewportPosition(int column) const
+{
+Q_D(const QTreeView);
+return d->header->sectionViewportPosition(column);
+}
+/*!
+Returns the width of the \a column.
+\sa resizeColumnToContents(), setColumnWidth()
+*/
+int QTreeView::columnWidth(int column) const
+{
+Q_D(const QTreeView);
+return d->header->sectionSize(column);
+}
+/*!
+\since 4.2
+Sets the width of the given \a column to the \a width specified.
+\sa columnWidth(), resizeColumnToContents()
+*/
+void QTreeView::setColumnWidth(int column, int width)
+{
+Q_D(QTreeView);
+d->header->resizeSection(column, width);
+}
+/*!
+Returns the column in the tree view whose header covers the \a x
+coordinate given.
+*/
+int QTreeView::columnAt(int x) const
+{
+Q_D(const QTreeView);
+return d->header->logicalIndexAt(x);
+}
+/*!
+Returns true if the \a column is hidden; otherwise returns false.
+\sa hideColumn(), isRowHidden()
+*/
+bool QTreeView::isColumnHidden(int column) const
+{
+Q_D(const QTreeView);
+return d->header->isSectionHidden(column);
+}
+/*!
+If \a hide is true the \a column is hidden, otherwise the \a column is shown.
+\sa hideColumn(), setRowHidden()
+*/
+void QTreeView::setColumnHidden(int column, bool hide)
+{
+Q_D(QTreeView);
+if (column < 0 || column >= d->header->count())
+return;
+d->header->setSectionHidden(column, hide);
+}
+/*!
+\property QTreeView::headerHidden
+\brief whether the header is shown or not.
+\since 4.4
+If this property is true, the header is not shown otherwise it is.
+The default value is false.
+\sa header()
+*/
+bool QTreeView::isHeaderHidden() const
+{
+Q_D(const QTreeView);
+return d->header->isHidden();
+}
+void QTreeView::setHeaderHidden(bool hide)
+{
+Q_D(QTreeView);
+d->header->setHidden(hide);
+}
+/*!
+Returns true if the item in the given \a row of the \a parent is hidden;
+otherwise returns false.
+\sa setRowHidden(), isColumnHidden()
+*/
+bool QTreeView::isRowHidden(int row, const QModelIndex &parent) const
+{
+Q_D(const QTreeView);
+if (!d->model)
+return false;
+return d->isRowHidden(d->model->index(row, 0, parent));
+}
+/*!
+If \a hide is true the \a row with the given \a parent is hidden, otherwise the \a row is shown.
+\sa isRowHidden(), setColumnHidden()
+*/
+void QTreeView::setRowHidden(int row, const QModelIndex &parent, bool hide)
+{
+Q_D(QTreeView);
+if (!d->model)
+return;
+QModelIndex index = d->model->index(row, 0, parent);
+if (!index.isValid())
+return;
+if (hide) {
+d->hiddenIndexes.insert(index);
+} else if(d->isPersistent(index)) { //if the index is not persistent, it cannot be in the set
+d->hiddenIndexes.remove(index);
+}
+d->doDelayedItemsLayout();
+}
+/*!
+\since 4.3
+Returns true if the item in first column in the given \a row
+of the \a parent is spanning all the columns; otherwise returns false.
+\sa setFirstColumnSpanned()
+*/
+bool QTreeView::isFirstColumnSpanned(int row, const QModelIndex &parent) const
+{
+Q_D(const QTreeView);
+if (d->spanningIndexes.isEmpty() || !d->model)
+return false;
+QModelIndex index = d->model->index(row, 0, parent);
+for (int i = 0; i < d->spanningIndexes.count(); ++i)
+if (d->spanningIndexes.at(i) == index)
+return true;
+return false;
+}
+/*!
+\since 4.3
+If \a span is true the item in the first column in the \a row
+with the given \a parent is set to span all columns, otherwise all items
+on the \a row are shown.
+\sa isFirstColumnSpanned()
+*/
+void QTreeView::setFirstColumnSpanned(int row, const QModelIndex &parent, bool span)
+{
+Q_D(QTreeView);
+if (!d->model)
+return;
+QModelIndex index = d->model->index(row, 0, parent);
+if (!index.isValid())
+return;
+if (span) {
+QPersistentModelIndex persistent(index);
+if (!d->spanningIndexes.contains(persistent))
+d->spanningIndexes.append(persistent);
+} else {
+QPersistentModelIndex persistent(index);
+int i = d->spanningIndexes.indexOf(persistent);
+if (i >= 0)
+d->spanningIndexes.remove(i);
+}
+d->executePostedLayout();
+int i = d->viewIndex(index);
+if (i >= 0)
+d->viewItems[i].spanning = span;
+d->viewport->update();
+}
+/*!
+\reimp
+*/
+void QTreeView::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
+{
+Q_D(QTreeView);
+// if we are going to do a complete relayout anyway, there is no need to update
+if (d->delayedPendingLayout)
+return;
+// refresh the height cache here; we don't really lose anything by getting the size hint,
+// since QAbstractItemView::dataChanged() will get the visualRect for the items anyway
+int topViewIndex = d->viewIndex(topLeft);
+if (topViewIndex == 0)
+d->defaultItemHeight = indexRowSizeHint(topLeft);
+bool sizeChanged = false;
+if (topViewIndex != -1) {
+if (topLeft == bottomRight) {
+int oldHeight = d->itemHeight(topViewIndex);
+d->invalidateHeightCache(topViewIndex);
+sizeChanged = (oldHeight != d->itemHeight(topViewIndex));
+} else {
+int bottomViewIndex = d->viewIndex(bottomRight);
+for (int i = topViewIndex; i <= bottomViewIndex; ++i) {
+int oldHeight = d->itemHeight(i);
+d->invalidateHeightCache(i);
+sizeChanged |= (oldHeight != d->itemHeight(i));
+}
+}
+}
+if (sizeChanged) {
+d->updateScrollBars();
+d->viewport->update();
+}
+QAbstractItemView::dataChanged(topLeft, bottomRight);
+}
+/*!
+Hides the \a column given.
+\note This function should only be called after the model has been
+initialized, as the view needs to know the number of columns in order to
+hide \a column.
+\sa showColumn(), setColumnHidden()
+*/
+void QTreeView::hideColumn(int column)
+{
+Q_D(QTreeView);
+d->header->hideSection(column);
+}
+/*!
+Shows the given \a column in the tree view.
+\sa hideColumn(), setColumnHidden()
+*/
+void QTreeView::showColumn(int column)
+{
+Q_D(QTreeView);
+d->header->showSection(column);
+}
+/*!
+\fn void QTreeView::expand(const QModelIndex &index)
+Expands the model item specified by the \a index.
+\sa expanded()
+*/
+void QTreeView::expand(const QModelIndex &index)
+{
+Q_D(QTreeView);
+if (!d->isIndexValid(index))
+return;
+if (d->delayedPendingLayout) {
+//A complete relayout is going to be performed, just store the expanded index, no need to layout.
+if (d->storeExpanded(index))
+emit expanded(index);
+return;
+}
+int i = d->viewIndex(index);
+if (i != -1) { // is visible
+d->expand(i, true);
+if (!d->isAnimating()) {
+updateGeometries();
+d->viewport->update();
+}
+} else if (d->storeExpanded(index)) {
+emit expanded(index);
+}
+}
+/*!
+\fn void QTreeView::collapse(const QModelIndex &index)
+Collapses the model item specified by the \a index.
+\sa collapsed()
+*/
+void QTreeView::collapse(const QModelIndex &index)
+{
+Q_D(QTreeView);
+if (!d->isIndexValid(index))
+return;
+//if the current item is now invisible, the autoscroll will expand the tree to see it, so disable the autoscroll
+d->delayedAutoScroll.stop();
+if (d->delayedPendingLayout) {
+//A complete relayout is going to be performed, just un-store the expanded index, no need to layout.
+if (d->isPersistent(index) && d->expandedIndexes.remove(index))
+emit collapsed(index);
+return;
+}
+int i = d->viewIndex(index);
+if (i != -1) { // is visible
+d->collapse(i, true);
+if (!d->isAnimating()) {
+updateGeometries();
+viewport()->update();
+}
+} else {
+if (d->isPersistent(index) && d->expandedIndexes.remove(index))
+emit collapsed(index);
+}
+}
+/*!
+\fn bool QTreeView::isExpanded(const QModelIndex &index) const
+Returns true if the model item \a index is expanded; otherwise returns
+false.
+\sa expand(), expanded(), setExpanded()
+*/
+bool QTreeView::isExpanded(const QModelIndex &index) const
+{
+Q_D(const QTreeView);
+return d->isIndexExpanded(index);
+}
+/*!
+Sets the item referred to by \a index to either collapse or expanded,
+depending on the value of \a expanded.
+\sa expanded(), expand(), isExpanded()
+*/
+void QTreeView::setExpanded(const QModelIndex &index, bool expanded)
+{
+if (expanded)
+this->expand(index);
+else
+this->collapse(index);
+}
+/*!
+\since 4.2
+\property QTreeView::sortingEnabled
+\brief whether sorting is enabled
+If this property is true, sorting is enabled for the tree; if the property
+is false, sorting is not enabled. The default value is false.
+\note In order to avoid performance issues, it is recommended that
+sorting is enabled \e after inserting the items into the tree.
+Alternatively, you could also insert the items into a list before inserting
+the items into the tree.
+\sa sortByColumn()
+*/
+void QTreeView::setSortingEnabled(bool enable)
+{
+Q_D(QTreeView);
+header()->setSortIndicatorShown(enable);
+header()->setClickable(enable);
+if (enable) {
+//sortByColumn has to be called before we connect or set the sortingEnabled flag
+// because otherwise it will not call sort on the model.
+sortByColumn(header()->sortIndicatorSection(), header()->sortIndicatorOrder());
+connect(header(), SIGNAL(sortIndicatorChanged(int,Qt::SortOrder)),
+this, SLOT(_q_sortIndicatorChanged(int,Qt::SortOrder)), Qt::UniqueConnection);
+} else {
+disconnect(header(), SIGNAL(sortIndicatorChanged(int,Qt::SortOrder)),
+this, SLOT(_q_sortIndicatorChanged(int,Qt::SortOrder)));
+}
+d->sortingEnabled = enable;
+}
+bool QTreeView::isSortingEnabled() const
+{
+Q_D(const QTreeView);
+return d->sortingEnabled;
+}
+/*!
+\since 4.2
+\property QTreeView::animated
+\brief whether animations are enabled
+If this property is true the treeview will animate expandsion
+and collasping of branches. If this property is false, the treeview
+will expand or collapse branches immediately without showing
+the animation.
+By default, this property is false.
+*/
+void QTreeView::setAnimated(bool animate)
+{
+Q_D(QTreeView);
+d->animationsEnabled = animate;
+}
+bool QTreeView::isAnimated() const
+{
+Q_D(const QTreeView);
+return d->animationsEnabled;
+}
+/*!
+\since 4.2
+\property QTreeView::allColumnsShowFocus
+\brief whether items should show keyboard focus using all columns
+If this property is true all columns will show focus, otherwise only
+one column will show focus.
+The default is false.
+*/
+void QTreeView::setAllColumnsShowFocus(bool enable)
+{
+Q_D(QTreeView);
+if (d->allColumnsShowFocus == enable)
+return;
+d->allColumnsShowFocus = enable;
+d->viewport->update();
+}
+bool QTreeView::allColumnsShowFocus() const
+{
+Q_D(const QTreeView);
+return d->allColumnsShowFocus;
+}
+/*!
+\property QTreeView::wordWrap
+\brief the item text word-wrapping policy
+\since 4.3
+If this property is true then the item text is wrapped where
+necessary at word-breaks; otherwise it is not wrapped at all.
+This property is false by default.
+Note that even if wrapping is enabled, the cell will not be
+expanded to fit all text. Ellipsis will be inserted according to
+the current \l{QAbstractItemView::}{textElideMode}.
+*/
+void QTreeView::setWordWrap(bool on)
+{
+Q_D(QTreeView);
+if (d->wrapItemText == on)
+return;
+d->wrapItemText = on;
+d->doDelayedItemsLayout();
+}
+bool QTreeView::wordWrap() const
+{
+Q_D(const QTreeView);
+return d->wrapItemText;
+}
+/*!
+\reimp
+*/
+void QTreeView::keyboardSearch(const QString &search)
+{
+Q_D(QTreeView);
+if (!d->model->rowCount(d->root) || !d->model->columnCount(d->root))
+return;
+QModelIndex start;
+if (currentIndex().isValid())
+start = currentIndex();
+else
+start = d->model->index(0, 0, d->root);
+QTime now(QTime::currentTime());
+bool skipRow = false;
+if (search.isEmpty()
+|| (d->keyboardInputTime.msecsTo(now) > QApplication::keyboardInputInterval())) {
+d->keyboardInput = search;
+skipRow = true;
+} else {
+d->keyboardInput += search;
+}
+d->keyboardInputTime = now;
+// special case for searches with same key like 'aaaaa'
+bool sameKey = false;
+if (d->keyboardInput.length() > 1) {
+int c = d->keyboardInput.count(d->keyboardInput.at(d->keyboardInput.length() - 1));
+sameKey = (c == d->keyboardInput.length());
+if (sameKey)
+skipRow = true;
+}
+// skip if we are searching for the same key or a new search started
+if (skipRow) {
+if (indexBelow(start).isValid())
+start = indexBelow(start);
+else
+start = d->model->index(0, start.column(), d->root);
+}
+d->executePostedLayout();
+int startIndex = d->viewIndex(start);
+if (startIndex <= -1)
+return;
+int previousLevel = -1;
+int bestAbove = -1;
+int bestBelow = -1;
+QString searchString = sameKey ? QString(d->keyboardInput.at(0)) : d->keyboardInput;
+for (int i = 0; i < d->viewItems.count(); ++i) {
+if ((int)d->viewItems.at(i).level > previousLevel) {
+QModelIndex searchFrom = d->viewItems.at(i).index;
+if (searchFrom.parent() == start.parent())
+searchFrom = start;
+QModelIndexList match = d->model->match(searchFrom, Qt::DisplayRole, searchString);
+if (match.count()) {
+int hitIndex = d->viewIndex(match.at(0));
+if (hitIndex >= 0 && hitIndex < startIndex)
+bestAbove = bestAbove == -1 ? hitIndex : qMin(hitIndex, bestAbove);
+else if (hitIndex >= startIndex)
+bestBelow = bestBelow == -1 ? hitIndex : qMin(hitIndex, bestBelow);
+}
+}
+previousLevel = d->viewItems.at(i).level;
+}
+QModelIndex index;
+if (bestBelow > -1)
+index = d->viewItems.at(bestBelow).index;
+else if (bestAbove > -1)
+index = d->viewItems.at(bestAbove).index;
+if (index.isValid()) {
+QItemSelectionModel::SelectionFlags flags = (d->selectionMode == SingleSelection
+? QItemSelectionModel::SelectionFlags(
+QItemSelectionModel::ClearAndSelect
+|d->selectionBehaviorFlags())
+: QItemSelectionModel::SelectionFlags(
+QItemSelectionModel::NoUpdate));
+selectionModel()->setCurrentIndex(index, flags);
+}
+}
+/*!
+Returns the rectangle on the viewport occupied by the item at \a index.
+If the index is not visible or explicitly hidden, the returned rectangle is invalid.
+*/
+QRect QTreeView::visualRect(const QModelIndex &index) const
+{
+Q_D(const QTreeView);
+if (!d->isIndexValid(index) || isIndexHidden(index))
+return QRect();
+d->executePostedLayout();
+int vi = d->viewIndex(index);
+if (vi < 0)
+return QRect();
+bool spanning = d->viewItems.at(vi).spanning;
+// if we have a spanning item, make the selection stretch from left to right
+int x = (spanning ? 0 : columnViewportPosition(index.column()));
+int w = (spanning ? d->header->length() : columnWidth(index.column()));
+// handle indentation
+if (index.column() == 0) {
+int i = d->indentationForItem(vi);
+w -= i;
+if (!isRightToLeft())
+x += i;
+}
+int y = d->coordinateForItem(vi);
+int h = d->itemHeight(vi);
+return QRect(x, y, w, h);
+}
+/*!
+Scroll the contents of the tree view until the given model item
+\a index is visible. The \a hint parameter specifies more
+precisely where the item should be located after the
+operation.
+If any of the parents of the model item are collapsed, they will
+be expanded to ensure that the model item is visible.
+*/
+void QTreeView::scrollTo(const QModelIndex &index, ScrollHint hint)
+{
+Q_D(QTreeView);
+if (!d->isIndexValid(index))
+return;
+d->executePostedLayout();
+d->updateScrollBars();
+// Expand all parents if the parent(s) of the node are not expanded.
+QModelIndex parent = index.parent();
+while (parent.isValid() && state() == NoState && d->itemsExpandable) {
+if (!isExpanded(parent))
+expand(parent);
+parent = d->model->parent(parent);
+}
+int item = d->viewIndex(index);
+if (item < 0)
+return;
+QRect area = d->viewport->rect();
+// vertical
+if (verticalScrollMode() == QAbstractItemView::ScrollPerItem) {
+int top = verticalScrollBar()->value();
+int bottom = top + verticalScrollBar()->pageStep();
+if (hint == EnsureVisible && item >= top && item < bottom) {
+// nothing to do
+} else if (hint == PositionAtTop || (hint == EnsureVisible && item < top)) {
+verticalScrollBar()->setValue(item);
+} else { // PositionAtBottom or PositionAtCenter
+const int currentItemHeight = d->itemHeight(item);
+int y = (hint == PositionAtCenter
+//we center on the current item with a preference to the top item (ie. -1)
+? area.height() / 2 + currentItemHeight - 1
+//otherwise we simply take the whole space
+: area.height());
+if (y > currentItemHeight) {
+while (item >= 0) {
+y -= d->itemHeight(item);
+if (y < 0) { //there is no more space left
+item++;
+break;
+}
+item--;
+}
+}
+verticalScrollBar()->setValue(item);
+}
+} else { // ScrollPerPixel
+QRect rect(columnViewportPosition(index.column()),
+d->coordinateForItem(item), // ### slow for items outside the view
+columnWidth(index.column()),
+d->itemHeight(item));
+if (rect.isEmpty()) {
+// nothing to do
+} else if (hint == EnsureVisible && area.contains(rect)) {
+d->viewport->update(rect);
+// nothing to do
+} else {
+bool above = (hint == EnsureVisible
+&& (rect.top() < area.top()
+|| area.height() < rect.height()));
+bool below = (hint == EnsureVisible
+&& rect.bottom() > area.bottom()
+&& rect.height() < area.height());
+int verticalValue = verticalScrollBar()->value();
+if (hint == PositionAtTop || above)
+verticalValue += rect.top();
+else if (hint == PositionAtBottom || below)
+verticalValue += rect.bottom() - area.height();
+else if (hint == PositionAtCenter)
+verticalValue += rect.top() - ((area.height() - rect.height()) / 2);
+verticalScrollBar()->setValue(verticalValue);
+}
+}
+// horizontal
+int viewportWidth = d->viewport->width();
+int horizontalOffset = d->header->offset();
+int horizontalPosition = d->header->sectionPosition(index.column());
+int cellWidth = d->header->sectionSize(index.column());
+if (hint == PositionAtCenter) {
+horizontalScrollBar()->setValue(horizontalPosition - ((viewportWidth - cellWidth) / 2));
+} else {
+if (horizontalPosition - horizontalOffset < 0 || cellWidth > viewportWidth)
+horizontalScrollBar()->setValue(horizontalPosition);
+else if (horizontalPosition - horizontalOffset + cellWidth > viewportWidth)
+horizontalScrollBar()->setValue(horizontalPosition - viewportWidth + cellWidth);
+}
+}
+/*!
+\reimp
+*/
+void QTreeView::timerEvent(QTimerEvent *event)
+{
+Q_D(QTreeView);
+if (event->timerId() == d->columnResizeTimerID) {
+updateGeometries();
+killTimer(d->columnResizeTimerID);
+d->columnResizeTimerID = 0;
+QRect rect;
+int viewportHeight = d->viewport->height();
+int viewportWidth = d->viewport->width();
+for (int i = d->columnsToUpdate.size() - 1; i >= 0; --i) {
+int column = d->columnsToUpdate.at(i);
+int x = columnViewportPosition(column);
+if (isRightToLeft())
+rect |= QRect(0, 0, x + columnWidth(column), viewportHeight);
+else
+rect |= QRect(x, 0, viewportWidth - x, viewportHeight);
+}
+d->viewport->update(rect.normalized());
+d->columnsToUpdate.clear();
+} else if (event->timerId() == d->openTimer.timerId()) {
+QPoint pos = d->viewport->mapFromGlobal(QCursor::pos());
+if (state() == QAbstractItemView::DraggingState
+&& d->viewport->rect().contains(pos)) {
+QModelIndex index = indexAt(pos);
+setExpanded(index, !isExpanded(index));
+}
+d->openTimer.stop();
+}
+QAbstractItemView::timerEvent(event);
+}
+/*!
+\reimp
+*/
+#ifndef QT_NO_DRAGANDDROP
+void QTreeView::dragMoveEvent(QDragMoveEvent *event)
+{
+Q_D(QTreeView);
+if (d->autoExpandDelay >= 0)
+d->openTimer.start(d->autoExpandDelay, this);
+QAbstractItemView::dragMoveEvent(event);
+}
+#endif
+/*!
+\reimp
+*/
+bool QTreeView::viewportEvent(QEvent *event)
+{
+Q_D(QTreeView);
+switch (event->type()) {
+case QEvent::HoverEnter:
+case QEvent::HoverLeave:
+case QEvent::HoverMove: {
+QHoverEvent *he = static_cast<QHoverEvent*>(event);
+int oldBranch = d->hoverBranch;
+d->hoverBranch = d->itemDecorationAt(he->pos());
+if (oldBranch != d->hoverBranch) {
+QModelIndex oldIndex = d->modelIndex(oldBranch),
+newIndex = d->modelIndex(d->hoverBranch);
+if (oldIndex != newIndex) {
+QRect oldRect = visualRect(oldIndex);
+QRect newRect = visualRect(newIndex);
+oldRect.setLeft(oldRect.left() - d->indent);
+newRect.setLeft(newRect.left() - d->indent);
+//we need to paint the whole items (including the decoration) so that when the user
+//moves the mouse over those elements they are updated
+viewport()->update(oldRect);
+viewport()->update(newRect);
+}
+}
+break; }
+default:
+break;
+}
+return QAbstractItemView::viewportEvent(event);
+}
+/*!
+\reimp
+*/
+void QTreeView::paintEvent(QPaintEvent *event)
+{
+Q_D(QTreeView);
+d->executePostedLayout();
+QPainter painter(viewport());
+#ifndef QT_NO_ANIMATION
+if (d->isAnimating()) {
+drawTree(&painter, event->region() - d->animatedOperation.rect());
+d->drawAnimatedOperation(&painter);
+} else
+#endif //QT_NO_ANIMATION
+{
+drawTree(&painter, event->region());
+#ifndef QT_NO_DRAGANDDROP
+d->paintDropIndicator(&painter);
+#endif
+}
+}
+void QTreeViewPrivate::paintAlternatingRowColors(QPainter *painter, QStyleOptionViewItemV4 *option, int y, int bottom) const
+{
+Q_Q(const QTreeView);
+if (!alternatingColors || !q->style()->styleHint(QStyle::SH_ItemView_PaintAlternatingRowColorsForEmptyArea, option, q))
+return;
+int rowHeight = defaultItemHeight;
+if (rowHeight <= 0) {
+rowHeight = itemDelegate->sizeHint(*option, QModelIndex()).height();
+if (rowHeight <= 0)
+return;
+}
+while (y <= bottom) {
+option->rect.setRect(0, y, viewport->width(), rowHeight);
+if (current & 1) {
+option->features |= QStyleOptionViewItemV2::Alternate;
+} else {
+option->features &= ~QStyleOptionViewItemV2::Alternate;
+}
+++current;
+q->style()->drawPrimitive(QStyle::PE_PanelItemViewRow, option, painter, q);
+y += rowHeight;
+}
+}
+bool QTreeViewPrivate::expandOrCollapseItemAtPos(const QPoint &pos)
+{
+Q_Q(QTreeView);
+// we want to handle mousePress in EditingState (persistent editors)
+if ((state != QAbstractItemView::NoState
+		&& state != QAbstractItemView::EditingState)
+		|| !viewport->rect().contains(pos))
+return true;
+int i = itemDecorationAt(pos);
+if ((i != -1) && itemsExpandable && hasVisibleChildren(viewItems.at(i).index)) {
+if (viewItems.at(i).expanded)
+collapse(i, true);
+else
+expand(i, true);
+if (!isAnimating()) {
+q->updateGeometries();
+viewport->update();
+}
+return true;
+}
+return false;
+}
+void QTreeViewPrivate::_q_modelDestroyed()
+{
+//we need to clear that list because it contais QModelIndex to
+//the model currently being destroyed
+viewItems.clear();
+QAbstractItemViewPrivate::_q_modelDestroyed();
+}
+/*!
+\reimp
+We have a QTreeView way of knowing what elements are on the viewport
+*/
+QItemViewPaintPairs QTreeViewPrivate::draggablePaintPairs(const QModelIndexList &indexes, QRect *r) const
+{
+Q_ASSERT(r);
+return QAbstractItemViewPrivate::draggablePaintPairs(indexes, r);
+Q_Q(const QTreeView);
+QRect &rect = *r;
+const QRect viewportRect = viewport->rect();
+int itemOffset = 0;
+int row = firstVisibleItem(&itemOffset);
+QPair<int, int> startEnd = startAndEndColumns(viewportRect);
+QVector<int> columns;
+for (int i = startEnd.first; i <= startEnd.second; ++i) {
+int logical = header->logicalIndex(i);
+if (!header->isSectionHidden(logical))
+columns += logical;
+}
+QSet<QModelIndex> visibleIndexes;
+for (; itemOffset < viewportRect.bottom() && row < viewItems.count(); ++row) {
+const QModelIndex &index = viewItems.at(row).index;
+for (int colIndex = 0; colIndex < columns.count(); ++colIndex)
+visibleIndexes += index.sibling(index.row(), columns.at(colIndex));
+itemOffset += itemHeight(row);
+}
+//now that we have the visible indexes, we can try to find those which are selected
+QItemViewPaintPairs ret;
+for (int i = 0; i < indexes.count(); ++i) {
+const QModelIndex &index = indexes.at(i);
+if (visibleIndexes.contains(index)) {
+const QRect current = q->visualRect(index);
+ret += qMakePair(current, index);
+rect |= current;
+}
+}
+rect &= viewportRect;
+return ret;
+}
+/*!
+\since 4.2
+Draws the part of the tree intersecting the given \a region using the specified
+\a painter.
+\sa paintEvent()
+*/
+void QTreeView::drawTree(QPainter *painter, const QRegion &region) const
+{
+Q_D(const QTreeView);
+const QVector<QTreeViewItem> viewItems = d->viewItems;
+QStyleOptionViewItemV4 option = d->viewOptionsV4();
+const QStyle::State state = option.state;
+d->current = 0;
+if (viewItems.count() == 0 || d->header->count() == 0 || !d->itemDelegate) {
+d->paintAlternatingRowColors(painter, &option, 0, region.boundingRect().bottom()+1);
+return;
+}
+int firstVisibleItemOffset = 0;
+const int firstVisibleItem = d->firstVisibleItem(&firstVisibleItemOffset);
+if (firstVisibleItem < 0) {
+d->paintAlternatingRowColors(painter, &option, 0, region.boundingRect().bottom()+1);
+return;
+}
+const int viewportWidth = d->viewport->width();
+QVector<QRect> rects = region.rects();
+QVector<int> drawn;
+bool multipleRects = (rects.size() > 1);
+for (int a = 0; a < rects.size(); ++a) {
+const QRect area = (multipleRects
+? QRect(0, rects.at(a).y(), viewportWidth, rects.at(a).height())
+: rects.at(a));
+d->leftAndRight = d->startAndEndColumns(area);
+int i = firstVisibleItem; // the first item at the top of the viewport
+int y = firstVisibleItemOffset; // we may only see part of the first item
+// start at the top of the viewport  and iterate down to the update area
+for (; i < viewItems.count(); ++i) {
+const int itemHeight = d->itemHeight(i);
+if (y + itemHeight > area.top())
+break;
+y += itemHeight;
+}
+// paint the visible rows
+for (; i < viewItems.count() && y <= area.bottom(); ++i) {
+const int itemHeight = d->itemHeight(i);
+option.rect.setRect(0, y, viewportWidth, itemHeight);
+option.state = state | (viewItems.at(i).expanded ? QStyle::State_Open : QStyle::State_None)
+| (viewItems.at(i).hasChildren ? QStyle::State_Children : QStyle::State_None)
+| (viewItems.at(i).hasMoreSiblings ? QStyle::State_Sibling : QStyle::State_None);
+d->current = i;
+d->spanning = viewItems.at(i).spanning;
+if (!multipleRects || !drawn.contains(i)) {
+drawRow(painter, option, viewItems.at(i).index);
+if (multipleRects)   // even if the rect only intersects the item,
+drawn.append(i); // the entire item will be painted
+}
+y += itemHeight;
+}
+if (y <= area.bottom()) {
+d->current = i;
+d->paintAlternatingRowColors(painter, &option, y, area.bottom());
+}
+}
+}
+/// ### move to QObject :)
+static inline bool ancestorOf(QObject *widget, QObject *other)
+{
+for (QObject *parent = other; parent != 0; parent = parent->parent()) {
+if (parent == widget)
+return true;
+}
+return false;
+}
+/*!
+Draws the row in the tree view that contains the model item \a index,
+using the \a painter given. The \a option control how the item is
+displayed.
+\sa setAlternatingRowColors()
+*/
+void QTreeView::drawRow(QPainter *painter, const QStyleOptionViewItem &option,
+const QModelIndex &index) const
+{
+Q_D(const QTreeView);
+QStyleOptionViewItemV4 opt = option;
+const QPoint offset = d->scrollDelayOffset;
+const int y = option.rect.y() + offset.y();
+const QModelIndex parent = index.parent();
+const QHeaderView *header = d->header;
+const QModelIndex current = currentIndex();
+const QModelIndex hover = d->hover;
+const bool reverse = isRightToLeft();
+const QStyle::State state = opt.state;
+const bool spanning = d->spanning;
+const int left = (spanning ? header->visualIndex(0) : d->leftAndRight.first);
+const int right = (spanning ? header->visualIndex(0) : d->leftAndRight.second);
+const bool alternate = d->alternatingColors;
+const bool enabled = (state & QStyle::State_Enabled) != 0;
+const bool allColumnsShowFocus = d->allColumnsShowFocus;
+// when the row contains an index widget which has focus,
+// we want to paint the entire row as active
+bool indexWidgetHasFocus = false;
+if ((current.row() == index.row()) && !d->editors.isEmpty()) {
+const int r = index.row();
+QWidget *fw = QApplication::focusWidget();
+for (int c = 0; c < header->count(); ++c) {
+QModelIndex idx = d->model->index(r, c, parent);
+if (QWidget *editor = indexWidget(idx)) {
+if (ancestorOf(editor, fw)) {
+indexWidgetHasFocus = true;
+break;
+}
+}
+}
+}
+const bool widgetHasFocus = hasFocus();
+bool currentRowHasFocus = false;
+if (allColumnsShowFocus && widgetHasFocus && current.isValid()) {
+// check if the focus index is before or after the visible columns
+const int r = index.row();
+for (int c = 0; c < left && !currentRowHasFocus; ++c) {
+QModelIndex idx = d->model->index(r, c, parent);
+currentRowHasFocus = (idx == current);
+}
+QModelIndex parent = d->model->parent(index);
+for (int c = right; c < header->count() && !currentRowHasFocus; ++c) {
+currentRowHasFocus = (d->model->index(r, c, parent) == current);
+}
+}
+// ### special case: treeviews with multiple columns draw
+// the selections differently than with only one column
+opt.showDecorationSelected = (d->selectionBehavior & SelectRows)
+|| option.showDecorationSelected;
+int width, height = option.rect.height();
+int position;
+QModelIndex modelIndex;
+int columnCount = header->count();
+const bool hoverRow = selectionBehavior() == QAbstractItemView::SelectRows
+&& index.parent() == hover.parent()
+&& index.row() == hover.row();
+/* 'left' and 'right' are the left-most and right-most visible visual indices.
+Compute the first visible logical indices before and after the left and right.
+We will use these values to determine the QStyleOptionViewItemV4::viewItemPosition. */
+int logicalIndexBeforeLeft = -1, logicalIndexAfterRight = -1;
+for (int visualIndex = left - 1; visualIndex >= 0; --visualIndex) {
+int logicalIndex = header->logicalIndex(visualIndex);
+if (!header->isSectionHidden(logicalIndex)) {
+logicalIndexBeforeLeft = logicalIndex;
+break;
+}
+}
+QVector<int> logicalIndices; // vector of currently visibly logical indices
+for (int visualIndex = left; visualIndex < columnCount; ++visualIndex) {
+int logicalIndex = header->logicalIndex(visualIndex);
+if (!header->isSectionHidden(logicalIndex)) {
+if (visualIndex > right) {
+logicalIndexAfterRight = logicalIndex;
+break;
+}
+logicalIndices.append(logicalIndex);
+}
+}
+for (int currentLogicalSection = 0; currentLogicalSection < logicalIndices.count(); ++currentLogicalSection) {
+int headerSection = logicalIndices.at(currentLogicalSection);
+position = columnViewportPosition(headerSection) + offset.x();
+width = header->sectionSize(headerSection);
+if (spanning) {
+int lastSection = header->logicalIndex(header->count() - 1);
+if (!reverse) {
+width = columnViewportPosition(lastSection) + header->sectionSize(lastSection) - position;
+} else {
+width += position - columnViewportPosition(lastSection);
+position = columnViewportPosition(lastSection);
+}
+}
+modelIndex = d->model->index(index.row(), headerSection, parent);
+if (!modelIndex.isValid())
+continue;
+opt.state = state;
+// determine the viewItemPosition depending on the position of column 0
+int nextLogicalSection = currentLogicalSection + 1 >= logicalIndices.count()
+? logicalIndexAfterRight
+: logicalIndices.at(currentLogicalSection + 1);
+int prevLogicalSection = currentLogicalSection - 1 < 0
+? logicalIndexBeforeLeft
+: logicalIndices.at(currentLogicalSection - 1);
+if (columnCount == 1 || (nextLogicalSection == 0 && prevLogicalSection == -1)
+|| (headerSection == 0 && nextLogicalSection == -1) || spanning)
+opt.viewItemPosition = QStyleOptionViewItemV4::OnlyOne;
+else if (headerSection == 0 || (nextLogicalSection != 0 && prevLogicalSection == -1))
+opt.viewItemPosition = QStyleOptionViewItemV4::Beginning;
+else if (nextLogicalSection == 0 || nextLogicalSection == -1)
+opt.viewItemPosition = QStyleOptionViewItemV4::End;
+else
+opt.viewItemPosition = QStyleOptionViewItemV4::Middle;
+// fake activeness when row editor has focus
+if (indexWidgetHasFocus)
+opt.state |= QStyle::State_Active;
+if (d->selectionModel->isSelected(modelIndex))
+opt.state |= QStyle::State_Selected;
+if (widgetHasFocus && (current == modelIndex)) {
+if (allColumnsShowFocus)
+currentRowHasFocus = true;
+else
+opt.state |= QStyle::State_HasFocus;
+}
+if ((hoverRow || modelIndex == hover)
+&& (option.showDecorationSelected || (d->hoverBranch == -1)))
+opt.state |= QStyle::State_MouseOver;
+else
+opt.state &= ~QStyle::State_MouseOver;
+if (enabled) {
+QPalette::ColorGroup cg;
+if ((d->model->flags(modelIndex) & Qt::ItemIsEnabled) == 0) {
+opt.state &= ~QStyle::State_Enabled;
+cg = QPalette::Disabled;
+} else if (opt.state & QStyle::State_Active) {
+cg = QPalette::Active;
+} else {
+cg = QPalette::Inactive;
+}
+opt.palette.setCurrentColorGroup(cg);
+}
+if (alternate) {
+if (d->current & 1) {
+opt.features |= QStyleOptionViewItemV2::Alternate;
+} else {
+opt.features &= ~QStyleOptionViewItemV2::Alternate;
+}
+}
+/* Prior to Qt 4.3, the background of the branch (in selected state and
+alternate row color was provided by the view. For backward compatibility,
+this is now delegated to the style using PE_PanelViewItemRow which
+does the appropriate fill */
+if (headerSection == 0) {
+const int i = d->indentationForItem(d->current);
+QRect branches(reverse ? position + width - i : position, y, i, height);
+const bool setClipRect = branches.width() > width;
+if (setClipRect) {
+painter->save();
+painter->setClipRect(QRect(position, y, width, height));
+}
+// draw background for the branch (selection + alternate row)
+opt.rect = branches;
+style()->drawPrimitive(QStyle::PE_PanelItemViewRow, &opt, painter, this);
+// draw background of the item (only alternate row). rest of the background
+// is provided by the delegate
+QStyle::State oldState = opt.state;
+opt.state &= ~QStyle::State_Selected;
+opt.rect.setRect(reverse ? position : i + position, y, width - i, height);
+style()->drawPrimitive(QStyle::PE_PanelItemViewRow, &opt, painter, this);
+opt.state = oldState;
+drawBranches(painter, branches, index);
+if (setClipRect)
+painter->restore();
+} else {
+QStyle::State oldState = opt.state;
+opt.state &= ~QStyle::State_Selected;
+opt.rect.setRect(position, y, width, height);
+style()->drawPrimitive(QStyle::PE_PanelItemViewRow, &opt, painter, this);
+opt.state = oldState;
+}
+if (const QWidget *widget = d->editorForIndex(modelIndex).editor) {
+painter->save();
+painter->setClipRect(widget->geometry());
+d->delegateForIndex(modelIndex)->paint(painter, opt, modelIndex);
+painter->restore();
+} else {
+d->delegateForIndex(modelIndex)->paint(painter, opt, modelIndex);
+}
+}
+if (currentRowHasFocus) {
+QStyleOptionFocusRect o;
+o.QStyleOption::operator=(option);
+o.state |= QStyle::State_KeyboardFocusChange;
+QPalette::ColorGroup cg = (option.state & QStyle::State_Enabled)
+? QPalette::Normal : QPalette::Disabled;
+o.backgroundColor = option.palette.color(cg, d->selectionModel->isSelected(index)
+? QPalette::Highlight : QPalette::Background);
+int x = 0;
+if (!option.showDecorationSelected)
+x = header->sectionPosition(0) + d->indentationForItem(d->current);
+	QRect focusRect(x - header->offset(), y, header->length() - x, height);
+o.rect = style()->visualRect(layoutDirection(), d->viewport->rect(), focusRect);
+style()->drawPrimitive(QStyle::PE_FrameFocusRect, &o, painter);
+// if we show focus on all columns and the first section is moved,
+// we have to split the focus rect into two rects
+if (allColumnsShowFocus && !option.showDecorationSelected
+&& header->sectionsMoved() && (header->visualIndex(0) != 0)) {
+	    QRect sectionRect(0, y, header->sectionPosition(0), height);
+o.rect = style()->visualRect(layoutDirection(), d->viewport->rect(), sectionRect);
+style()->drawPrimitive(QStyle::PE_FrameFocusRect, &o, painter);
+}
+}
+}
+/*!
+Draws the branches in the tree view on the same row as the model item
+\a index, using the \a painter given. The branches are drawn in the
+rectangle specified by \a rect.
+*/
+void QTreeView::drawBranches(QPainter *painter, const QRect &rect,
+const QModelIndex &index) const
+{
+Q_D(const QTreeView);
+const bool reverse = isRightToLeft();
+const int indent = d->indent;
+const int outer = d->rootDecoration ? 0 : 1;
+const int item = d->current;
+const QTreeViewItem &viewItem = d->viewItems.at(item);
+int level = viewItem.level;
+QRect primitive(reverse ? rect.left() : rect.right() + 1, rect.top(), indent, rect.height());
+QModelIndex parent = index.parent();
+QModelIndex current = parent;
+QModelIndex ancestor = current.parent();
+QStyleOptionViewItemV2 opt = viewOptions();
+QStyle::State extraFlags = QStyle::State_None;
+if (isEnabled())
+extraFlags |= QStyle::State_Enabled;
+if (window()->isActiveWindow())
+extraFlags |= QStyle::State_Active;
+QPoint oldBO = painter->brushOrigin();
+if (verticalScrollMode() == QAbstractItemView::ScrollPerPixel)
+painter->setBrushOrigin(QPoint(0, verticalOffset()));
+if (d->alternatingColors) {
+if (d->current & 1) {
+opt.features |= QStyleOptionViewItemV2::Alternate;
+} else {
+opt.features &= ~QStyleOptionViewItemV2::Alternate;
+}
+}
+// When hovering over a row, pass State_Hover for painting the branch
+// indicators if it has the decoration (aka branch) selected.
+bool hoverRow = selectionBehavior() == QAbstractItemView::SelectRows
+&& opt.showDecorationSelected
+&& index.parent() == d->hover.parent()
+&& index.row() == d->hover.row();
+if (d->selectionModel->isSelected(index))
+extraFlags |= QStyle::State_Selected;
+if (level >= outer) {
+// start with the innermost branch
+primitive.moveLeft(reverse ? primitive.left() : primitive.left() - indent);
+opt.rect = primitive;
+const bool expanded = viewItem.expanded;
+const bool children = viewItem.hasChildren;
+bool moreSiblings = viewItem.hasMoreSiblings;
+opt.state = QStyle::State_Item | extraFlags
+| (moreSiblings ? QStyle::State_Sibling : QStyle::State_None)
+| (children ? QStyle::State_Children : QStyle::State_None)
+| (expanded ? QStyle::State_Open : QStyle::State_None);
+if (hoverRow || item == d->hoverBranch)
+opt.state |= QStyle::State_MouseOver;
+else
+opt.state &= ~QStyle::State_MouseOver;
+style()->drawPrimitive(QStyle::PE_IndicatorBranch, &opt, painter, this);
+}
+// then go out level by level
+for (--level; level >= outer; --level) { // we have already drawn the innermost branch
+primitive.moveLeft(reverse ? primitive.left() + indent : primitive.left() - indent);
+opt.rect = primitive;
+opt.state = extraFlags;
+bool moreSiblings = false;
+if (d->hiddenIndexes.isEmpty()) {
+moreSiblings = (d->model->rowCount(ancestor) - 1 > current.row());
+} else {
+int successor = item + viewItem.total + 1;
+while (successor < d->viewItems.size()
+&& d->viewItems.at(successor).level >= uint(level)) {
+const QTreeViewItem &successorItem = d->viewItems.at(successor);
+if (successorItem.level == uint(level)) {
+moreSiblings = true;
+break;
+}
+successor += successorItem.total + 1;
+}
+}
+if (moreSiblings)
+opt.state |= QStyle::State_Sibling;
+if (hoverRow || item == d->hoverBranch)
+opt.state |= QStyle::State_MouseOver;
+else
+opt.state &= ~QStyle::State_MouseOver;
+style()->drawPrimitive(QStyle::PE_IndicatorBranch, &opt, painter, this);
+current = ancestor;
+ancestor = current.parent();
+}
+painter->setBrushOrigin(oldBO);
+}
+/*!
+\reimp
+*/
+void QTreeView::mousePressEvent(QMouseEvent *event)
+{
+	Q_D(QTreeView);
+bool handled = false;
+if (style()->styleHint(QStyle::SH_Q3ListViewExpand_SelectMouseType, 0, this) == QEvent::MouseButtonPress)
+handled = d->expandOrCollapseItemAtPos(event->pos());
+	if (!handled && d->itemDecorationAt(event->pos()) == -1)
+QAbstractItemView::mousePressEvent(event);
+}
+/*!
+\reimp
+*/
+void QTreeView::mouseReleaseEvent(QMouseEvent *event)
+{
+Q_D(QTreeView);
+if (d->itemDecorationAt(event->pos()) == -1) {
+QAbstractItemView::mouseReleaseEvent(event);
+} else {
+if (state() == QAbstractItemView::DragSelectingState)
+setState(QAbstractItemView::NoState);
+if (style()->styleHint(QStyle::SH_Q3ListViewExpand_SelectMouseType, 0, this) == QEvent::MouseButtonRelease)
+d->expandOrCollapseItemAtPos(event->pos());
+}
+}
+/*!
+\reimp
+*/
+void QTreeView::mouseDoubleClickEvent(QMouseEvent *event)
+{
+Q_D(QTreeView);
+if (state() != NoState || !d->viewport->rect().contains(event->pos()))
+return;
+int i = d->itemDecorationAt(event->pos());
+if (i == -1) {
+i = d->itemAtCoordinate(event->y());
+if (i == -1)
+return; // user clicked outside the items
+const QPersistentModelIndex firstColumnIndex = d->viewItems.at(i).index;
+const QPersistentModelIndex persistent = indexAt(event->pos());
+if (d->pressedIndex != persistent) {
+mousePressEvent(event);
+return;
+}
+// signal handlers may change the model
+emit doubleClicked(persistent);
+if (!persistent.isValid())
+return;
+if (edit(persistent, DoubleClicked, event) || state() != NoState)
+return; // the double click triggered editing
+if (!style()->styleHint(QStyle::SH_ItemView_ActivateItemOnSingleClick, 0, this))
+emit activated(persistent);
+d->executePostedLayout(); // we need to make sure viewItems is updated
+if (d->itemsExpandable
+&& d->expandsOnDoubleClick
+&& d->hasVisibleChildren(persistent)) {
+if (!((i < d->viewItems.count()) && (d->viewItems.at(i).index == firstColumnIndex))) {
+// find the new index of the item
+for (i = 0; i < d->viewItems.count(); ++i) {
+if (d->viewItems.at(i).index == firstColumnIndex)
+break;
+}
+if (i == d->viewItems.count())
+return;
+}
+if (d->viewItems.at(i).expanded)
+d->collapse(i, true);
+else
+d->expand(i, true);
+updateGeometries();
+viewport()->update();
+}
+}
+}
+/*!
+\reimp
+*/
+void QTreeView::mouseMoveEvent(QMouseEvent *event)
+{
+Q_D(QTreeView);
+if (d->itemDecorationAt(event->pos()) == -1) // ### what about expanding/collapsing state ?
+QAbstractItemView::mouseMoveEvent(event);
+}
+/*!
+\reimp
+*/
+void QTreeView::keyPressEvent(QKeyEvent *event)
+{
+Q_D(QTreeView);
+QModelIndex current = currentIndex();
+//this is the management of the expansion
+if (d->isIndexValid(current) && d->model && d->itemsExpandable) {
+switch (event->key()) {
+case Qt::Key_Asterisk: {
+QStack<QModelIndex> parents;
+parents.push(current);
+while (!parents.isEmpty()) {
+QModelIndex parent = parents.pop();
+for (int row = 0; row < d->model->rowCount(parent); ++row) {
+QModelIndex child = d->model->index(row, 0, parent);
+if (!d->isIndexValid(child))
+break;
+parents.push(child);
+expand(child);
+}
+}
+expand(current);
+break; }
+case Qt::Key_Plus:
+expand(current);
+break;
+case Qt::Key_Minus:
+collapse(current);
+break;
+}
+}
+QAbstractItemView::keyPressEvent(event);
+}
+/*!
+\reimp
+*/
+QModelIndex QTreeView::indexAt(const QPoint &point) const
+{
+Q_D(const QTreeView);
+d->executePostedLayout();
+int visualIndex = d->itemAtCoordinate(point.y());
+QModelIndex idx = d->modelIndex(visualIndex);
+if (!idx.isValid())
+return QModelIndex();
+if (d->viewItems.at(visualIndex).spanning)
+return idx;
+int column = d->columnAt(point.x());
+if (column == idx.column())
+return idx;
+if (column < 0)
+return QModelIndex();
+return idx.sibling(idx.row(), column);
+}
+/*!
+Returns the model index of the item above \a index.
+*/
+QModelIndex QTreeView::indexAbove(const QModelIndex &index) const
+{
+Q_D(const QTreeView);
+if (!d->isIndexValid(index))
+return QModelIndex();
+d->executePostedLayout();
+int i = d->viewIndex(index);
+if (--i < 0)
+return QModelIndex();
+return d->viewItems.at(i).index;
+}
+/*!
+Returns the model index of the item below \a index.
+*/
+QModelIndex QTreeView::indexBelow(const QModelIndex &index) const
+{
+Q_D(const QTreeView);
+if (!d->isIndexValid(index))
+return QModelIndex();
+d->executePostedLayout();
+int i = d->viewIndex(index);
+if (++i >= d->viewItems.count())
+return QModelIndex();
+return d->viewItems.at(i).index;
+}
+/*!
+\internal
+Lays out the items in the tree view.
+*/
+void QTreeView::doItemsLayout()
+{
+Q_D(QTreeView);
+d->viewItems.clear(); // prepare for new layout
+QModelIndex parent = d->root;
+if (d->model->hasChildren(parent)) {
+d->layout(-1);
+}
+QAbstractItemView::doItemsLayout();
+d->header->doItemsLayout();
+}
+/*!
+\reimp
+*/
+void QTreeView::reset()
+{
+Q_D(QTreeView);
+d->expandedIndexes.clear();
+d->hiddenIndexes.clear();
+d->spanningIndexes.clear();
+d->viewItems.clear();
+QAbstractItemView::reset();
+}
+/*!
+Returns the horizontal offset of the items in the treeview.
+Note that the tree view uses the horizontal header section
+positions to determine the positions of columns in the view.
+\sa verticalOffset()
+*/
+int QTreeView::horizontalOffset() const
+{
+Q_D(const QTreeView);
+return d->header->offset();
+}
+/*!
+Returns the vertical offset of the items in the tree view.
+\sa horizontalOffset()
+*/
+int QTreeView::verticalOffset() const
+{
+Q_D(const QTreeView);
+if (d->verticalScrollMode == QAbstractItemView::ScrollPerItem) {
+if (d->uniformRowHeights)
+return verticalScrollBar()->value() * d->defaultItemHeight;
+// If we are scrolling per item and have non-uniform row heights,
+// finding the vertical offset in pixels is going to be relatively slow.
+// ### find a faster way to do this
+d->executePostedLayout();
+int offset = 0;
+for (int i = 0; i < d->viewItems.count(); ++i) {
+if (i == verticalScrollBar()->value())
+return offset;
+offset += d->itemHeight(i);
+}
+return 0;
+}
+// scroll per pixel
+return verticalScrollBar()->value();
+}
+/*!
+Move the cursor in the way described by \a cursorAction, using the
+information provided by the button \a modifiers.
+*/
+QModelIndex QTreeView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
+{
+Q_D(QTreeView);
+Q_UNUSED(modifiers);
+d->executePostedLayout();
+QModelIndex current = currentIndex();
+if (!current.isValid()) {
+int i = d->below(-1);
+int c = 0;
+while (c < d->header->count() && d->header->isSectionHidden(c))
+++c;
+if (i < d->viewItems.count() && c < d->header->count()) {
+return d->modelIndex(i, c);
+}
+return QModelIndex();
+}
+int vi = -1;
+#if defined(Q_WS_MAC) && !defined(QT_NO_STYLE_MAC)
+// Selection behavior is slightly different on the Mac.
+if (d->selectionMode == QAbstractItemView::ExtendedSelection
+&& d->selectionModel
+&& d->selectionModel->hasSelection()) {
+const bool moveUpDown = (cursorAction == MoveUp || cursorAction == MoveDown);
+const bool moveNextPrev = (cursorAction == MoveNext || cursorAction == MovePrevious);
+const bool contiguousSelection = moveUpDown && (modifiers & Qt::ShiftModifier);
+// Use the outermost index in the selection as the current index
+if (!contiguousSelection && (moveUpDown || moveNextPrev)) {
+// Find outermost index.
+const bool useTopIndex = (cursorAction == MoveUp || cursorAction == MovePrevious);
+int index = useTopIndex ? INT_MAX : INT_MIN;
+const QItemSelection selection = d->selectionModel->selection();
+for (int i = 0; i < selection.count(); ++i) {
+const QItemSelectionRange &range = selection.at(i);
+int candidate = d->viewIndex(useTopIndex ? range.topLeft() : range.bottomRight());
+if (candidate >= 0)
+index = useTopIndex ? qMin(index, candidate) : qMax(index, candidate);
+}
+if (index >= 0 && index < INT_MAX)
+vi = index;
+}
+}
+#endif
+if (vi < 0)
+vi = qMax(0, d->viewIndex(current));
+if (isRightToLeft()) {
+if (cursorAction == MoveRight)
+cursorAction = MoveLeft;
+else if (cursorAction == MoveLeft)
+cursorAction = MoveRight;
+}
+switch (cursorAction) {
+case MoveNext:
+case MoveDown:
+#ifdef QT_KEYPAD_NAVIGATION
+if (vi == d->viewItems.count()-1 && QApplication::keypadNavigationEnabled())
+return d->model->index(0, current.column(), d->root);
+#endif
+return d->modelIndex(d->below(vi), current.column());
+case MovePrevious:
+case MoveUp:
+#ifdef QT_KEYPAD_NAVIGATION
+if (vi == 0 && QApplication::keypadNavigationEnabled())
+return d->modelIndex(d->viewItems.count() - 1, current.column());
+#endif
+return d->modelIndex(d->above(vi), current.column());
+case MoveLeft: {
+QScrollBar *sb = horizontalScrollBar();
+if (vi < d->viewItems.count() && d->viewItems.at(vi).expanded && d->itemsExpandable && sb->value() == sb->minimum())
+d->collapse(vi, true);
+else {
+bool descend = style()->styleHint(QStyle::SH_ItemView_ArrowKeysNavigateIntoChildren, 0, this);
+if (descend) {
+QModelIndex par = current.parent();
+if (par.isValid() && par != rootIndex())
+return par;
+else
+descend = false;
+}
+if (!descend) {
+if (d->selectionBehavior == SelectItems || d->selectionBehavior == SelectColumns) {
+int visualColumn = d->header->visualIndex(current.column()) - 1;
+while (visualColumn >= 0 && isColumnHidden(d->header->logicalIndex(visualColumn)))
+visualColumn--;
+int newColumn = d->header->logicalIndex(visualColumn);
+QModelIndex next = current.sibling(current.row(), newColumn);
+if (next.isValid())
+return next;
+}
+sb->setValue(sb->value() - sb->singleStep());
+}
+}
+updateGeometries();
+viewport()->update();
+break;
+}
+case MoveRight:
+if (vi < d->viewItems.count() && !d->viewItems.at(vi).expanded && d->itemsExpandable
+&& d->hasVisibleChildren(d->viewItems.at(vi).index)) {
+d->expand(vi, true);
+} else {
+bool descend = style()->styleHint(QStyle::SH_ItemView_ArrowKeysNavigateIntoChildren, 0, this);
+if (descend) {
+QModelIndex idx = d->modelIndex(d->below(vi));
+if (idx.parent() == current)
+return idx;
+else
+descend = false;
+}
+if (!descend) {
+if (d->selectionBehavior == SelectItems || d->selectionBehavior == SelectColumns) {
+int visualColumn = d->header->visualIndex(current.column()) + 1;
+while (visualColumn < d->model->columnCount(current.parent()) && isColumnHidden(d->header->logicalIndex(visualColumn)))
+visualColumn++;
+QModelIndex next = current.sibling(current.row(), visualColumn);
+if (next.isValid())
+return next;
+}
+//last restort: we change the scrollbar value
+QScrollBar *sb = horizontalScrollBar();
+sb->setValue(sb->value() + sb->singleStep());
+}
+}
+updateGeometries();
+viewport()->update();
+break;
+case MovePageUp:
+return d->modelIndex(d->pageUp(vi), current.column());
+case MovePageDown:
+return d->modelIndex(d->pageDown(vi), current.column());
+case MoveHome:
+return d->model->index(0, current.column(), d->root);
+case MoveEnd:
+return d->modelIndex(d->viewItems.count() - 1, current.column());
+}
+return current;
+}
+/*!
+Applies the selection \a command to the items in or touched by the
+rectangle, \a rect.
+\sa selectionCommand()
+*/
+void QTreeView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command)
+{
+Q_D(QTreeView);
+if (!selectionModel() || rect.isNull())
+return;
+d->executePostedLayout();
+QPoint tl(isRightToLeft() ? qMax(rect.left(), rect.right())
+: qMin(rect.left(), rect.right()), qMin(rect.top(), rect.bottom()));
+QPoint br(isRightToLeft() ? qMin(rect.left(), rect.right()) :
+qMax(rect.left(), rect.right()), qMax(rect.top(), rect.bottom()));
+QModelIndex topLeft = indexAt(tl);
+QModelIndex bottomRight = indexAt(br);
+if (!topLeft.isValid() && !bottomRight.isValid()) {
+if (command & QItemSelectionModel::Clear)
+selectionModel()->clear();
+return;
+}
+if (!topLeft.isValid() && !d->viewItems.isEmpty())
+topLeft = d->viewItems.first().index;
+if (!bottomRight.isValid() && !d->viewItems.isEmpty()) {
+const int column = d->header->logicalIndex(d->header->count() - 1);
+const QModelIndex index = d->viewItems.last().index;
+bottomRight = index.sibling(index.row(), column);
+}
+if (!d->isIndexEnabled(topLeft) || !d->isIndexEnabled(bottomRight))
+return;
+d->select(topLeft, bottomRight, command);
+}
+/*!
+Returns the rectangle from the viewport of the items in the given
+\a selection.
+*/
+QRegion QTreeView::visualRegionForSelection(const QItemSelection &selection) const
+{
+Q_D(const QTreeView);
+if (selection.isEmpty())
+return QRegion();
+QRegion selectionRegion;
+for (int i = 0; i < selection.count(); ++i) {
+QItemSelectionRange range = selection.at(i);
+if (!range.isValid())
+continue;
+QModelIndex parent = range.parent();
+QModelIndex leftIndex = range.topLeft();
+int columnCount = d->model->columnCount(parent);
+while (leftIndex.isValid() && isIndexHidden(leftIndex)) {
+if (leftIndex.column() + 1 < columnCount)
+leftIndex = d->model->index(leftIndex.row(), leftIndex.column() + 1, parent);
+else
+leftIndex = QModelIndex();
+}
+if (!leftIndex.isValid())
+continue;
+const QRect leftRect = visualRect(leftIndex);
+int top = leftRect.top();
+QModelIndex rightIndex = range.bottomRight();
+while (rightIndex.isValid() && isIndexHidden(rightIndex)) {
+if (rightIndex.column() - 1 >= 0)
+rightIndex = d->model->index(rightIndex.row(), rightIndex.column() - 1, parent);
+else
+rightIndex = QModelIndex();
+}
+if (!rightIndex.isValid())
+continue;
+const QRect rightRect = visualRect(rightIndex);
+int bottom = rightRect.bottom();
+if (top > bottom)
+qSwap<int>(top, bottom);
+int height = bottom - top + 1;
+if (d->header->sectionsMoved()) {
+for (int c = range.left(); c <= range.right(); ++c)
+selectionRegion += QRegion(QRect(columnViewportPosition(c), top,
+columnWidth(c), height));
+} else {
+QRect combined = leftRect|rightRect;
+combined.setX(columnViewportPosition(isRightToLeft() ? range.right() : range.left()));
+selectionRegion += combined;
+}
+}
+return selectionRegion;
+}
+/*!
+\reimp
+*/
+QModelIndexList QTreeView::selectedIndexes() const
+{
+QModelIndexList viewSelected;
+QModelIndexList modelSelected;
+if (selectionModel())
+modelSelected = selectionModel()->selectedIndexes();
+for (int i = 0; i < modelSelected.count(); ++i) {
+// check that neither the parents nor the index is hidden before we add
+QModelIndex index = modelSelected.at(i);
+while (index.isValid() && !isIndexHidden(index))
+index = index.parent();
+if (index.isValid())
+continue;
+viewSelected.append(modelSelected.at(i));
+}
+return viewSelected;
+}
+/*!
+Scrolls the contents of the tree view by (\a dx, \a dy).
+*/
+void QTreeView::scrollContentsBy(int dx, int dy)
+{
+Q_D(QTreeView);
+d->delayedAutoScroll.stop(); // auto scroll was canceled by the user scrolling
+dx = isRightToLeft() ? -dx : dx;
+if (dx) {
+if (horizontalScrollMode() == QAbstractItemView::ScrollPerItem) {
+int oldOffset = d->header->offset();
+if (horizontalScrollBar()->value() == horizontalScrollBar()->maximum())
+d->header->setOffsetToLastSection();
+else
+d->header->setOffsetToSectionPosition(horizontalScrollBar()->value());
+int newOffset = d->header->offset();
+dx = isRightToLeft() ? newOffset - oldOffset : oldOffset - newOffset;
+} else {
+d->header->setOffset(horizontalScrollBar()->value());
+}
+}
+const int itemHeight = d->defaultItemHeight <= 0 ? sizeHintForRow(0) : d->defaultItemHeight;
+if (d->viewItems.isEmpty() || itemHeight == 0)
+return;
+// guestimate the number of items in the viewport
+int viewCount = d->viewport->height() / itemHeight;
+int maxDeltaY = qMin(d->viewItems.count(), viewCount);
+// no need to do a lot of work if we are going to redraw the whole thing anyway
+if (qAbs(dy) > qAbs(maxDeltaY) && d->editors.isEmpty()) {
+verticalScrollBar()->update();
+d->viewport->update();
+return;
+}
+if (dy && verticalScrollMode() == QAbstractItemView::ScrollPerItem) {
+int currentScrollbarValue = verticalScrollBar()->value();
+int previousScrollbarValue = currentScrollbarValue + dy; // -(-dy)
+int currentViewIndex = currentScrollbarValue; // the first visible item
+int previousViewIndex = previousScrollbarValue;
+const QVector<QTreeViewItem> viewItems = d->viewItems;
+dy = 0;
+if (previousViewIndex < currentViewIndex) { // scrolling down
+for (int i = previousViewIndex; i < currentViewIndex; ++i) {
+if (i < d->viewItems.count())
+dy -= d->itemHeight(i);
+}
+} else if (previousViewIndex > currentViewIndex) { // scrolling up
+for (int i = previousViewIndex - 1; i >= currentViewIndex; --i) {
+if (i < d->viewItems.count())
+dy += d->itemHeight(i);
+}
+}
+}
+d->scrollContentsBy(dx, dy);
+}
+/*!
+This slot is called whenever a column has been moved.
+*/
+void QTreeView::columnMoved()
+{
+Q_D(QTreeView);
+updateEditorGeometries();
+d->viewport->update();
+}
+/*!
+\internal
+*/
+void QTreeView::reexpand()
+{
+// do nothing
+}
+/*!
+\internal
+*/
+static bool treeViewItemLessThan(const QTreeViewItem &left,
+const QTreeViewItem &right)
+{
+if (left.level != right.level) {
+Q_ASSERT(left.level > right.level);
+QModelIndex leftParent = left.index.parent();
+QModelIndex rightParent = right.index.parent();
+// computer parent, don't get
+while (leftParent.isValid() && leftParent.parent() != rightParent)
+leftParent = leftParent.parent();
+return (leftParent.row() < right.index.row());
+}
+return (left.index.row() < right.index.row());
+}
+/*!
+Informs the view that the rows from the \a start row to the \a end row
+inclusive have been inserted into the \a parent model item.
+*/
+void QTreeView::rowsInserted(const QModelIndex &parent, int start, int end)
+{
+Q_D(QTreeView);
+// if we are going to do a complete relayout anyway, there is no need to update
+if (d->delayedPendingLayout) {
+QAbstractItemView::rowsInserted(parent, start, end);
+return;
+}
+//don't add a hierarchy on a column != 0
+if (parent.column() != 0 && parent.isValid()) {
+QAbstractItemView::rowsInserted(parent, start, end);
+return;
+}
+const int parentRowCount = d->model->rowCount(parent);
+const int delta = end - start + 1;
+if (parent != d->root && !d->isIndexExpanded(parent) && parentRowCount > delta) {
+QAbstractItemView::rowsInserted(parent, start, end);
+return;
+}
+const int parentItem = d->viewIndex(parent);
+if (((parentItem != -1) && d->viewItems.at(parentItem).expanded && updatesEnabled())
+|| (parent == d->root)) {
+const uint childLevel = (parentItem == -1)
+? uint(0) : d->viewItems.at(parentItem).level + 1;
+const int firstChildItem = parentItem + 1;
+const int lastChildItem = firstChildItem + ((parentItem == -1)
+? d->viewItems.count()
+: d->viewItems.at(parentItem).total) - 1;
+if (parentRowCount == end + 1 && start > 0) {
+//need to Update hasMoreSiblings
+int previousRow = start - 1;
+QModelIndex previousSibilingModelIndex = d->model->index(previousRow, 0, parent);
+bool isHidden = d->isRowHidden(previousSibilingModelIndex);
+while (isHidden && previousRow > 0) {
+previousRow--;
+previousSibilingModelIndex = d->model->index(previousRow, 0, parent);
+isHidden = d->isRowHidden(previousSibilingModelIndex);
+}
+if (!isHidden) {
+const int previousSibilling = d->viewIndex(previousSibilingModelIndex);
+if(previousSibilling != -1)
+d->viewItems[previousSibilling].hasMoreSiblings = true;
+}
+}
+QVector<QTreeViewItem> insertedItems(delta);
+for (int i = 0; i < delta; ++i) {
+QTreeViewItem &item = insertedItems[i];
+item.index = d->model->index(i + start, 0, parent);
+item.level = childLevel;
+item.hasChildren = d->hasVisibleChildren(item.index);
+item.hasMoreSiblings = !((i == delta - 1) && (parentRowCount == end +1));
+}
+if (d->viewItems.isEmpty())
+d->defaultItemHeight = indexRowSizeHint(insertedItems[0].index);
+int insertPos;
+if (lastChildItem < firstChildItem) { // no children
+insertPos = firstChildItem;
+} else {
+// do a binary search to figure out where to insert
+QVector<QTreeViewItem>::iterator it;
+it = qLowerBound(d->viewItems.begin() + firstChildItem,
+d->viewItems.begin() + lastChildItem + 1,
+insertedItems.at(0), treeViewItemLessThan);
+insertPos = it - d->viewItems.begin();
+// update stale model indexes of siblings
+for (int item = insertPos; item <= lastChildItem; ) {
+Q_ASSERT(d->viewItems.at(item).level == childLevel);
+const QModelIndex modelIndex = d->viewItems.at(item).index;
+//Q_ASSERT(modelIndex.parent() == parent);
+d->viewItems[item].index = d->model->index(
+modelIndex.row() + delta, modelIndex.column(), parent);
+if (!d->viewItems[item].index.isValid()) {
+// Something really bad is happening, a bad model is
+// often the cause.  We can't optimize in this case :(
+qWarning() << "QTreeView::rowsInserted internal representation of the model has been corrupted, resetting.";
+doItemsLayout();
+return;
+}
+item += d->viewItems.at(item).total + 1;
+}
+}
+d->viewItems.insert(insertPos, delta, insertedItems.at(0));
+if (delta > 1) {
+qCopy(insertedItems.begin() + 1, insertedItems.end(),
+d->viewItems.begin() + insertPos + 1);
+}
+if (parentItem != -1)
+d->viewItems[parentItem].hasChildren = true;
+d->updateChildCount(parentItem, delta);
+updateGeometries();
+viewport()->update();
+} else if ((parentItem != -1) && d->viewItems.at(parentItem).expanded) {
+d->doDelayedItemsLayout();
+} else if (parentItem != -1 && (d->model->rowCount(parent) == end - start + 1)) {
+// the parent just went from 0 children to more. update to re-paint the decoration
+d->viewItems[parentItem].hasChildren = true;
+viewport()->update();
+}
+QAbstractItemView::rowsInserted(parent, start, end);
+}
+/*!
+Informs the view that the rows from the \a start row to the \a end row
+inclusive are about to removed from the given \a parent model item.
+*/
+void QTreeView::rowsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
+{
+Q_D(QTreeView);
+d->rowsRemoved(parent, start, end, false);
+QAbstractItemView::rowsAboutToBeRemoved(parent, start, end);
+}
+/*!
+\since 4.1
+Informs the view that the rows from the \a start row to the \a end row
+inclusive have been removed from the given \a parent model item.
+*/
+void QTreeView::rowsRemoved(const QModelIndex &parent, int start, int end)
+{
+Q_D(QTreeView);
+d->rowsRemoved(parent, start, end, true);
+}
+/*!
+Informs the tree view that the number of columns in the tree view has
+changed from \a oldCount to \a newCount.
+*/
+void QTreeView::columnCountChanged(int oldCount, int newCount)
+{
+Q_D(QTreeView);
+if (oldCount == 0 && newCount > 0) {
+//if the first column has just been added we need to relayout.
+d->doDelayedItemsLayout();
+}
+if (isVisible())
+updateGeometries();
+	viewport()->update();
+}
+/*!
+Resizes the \a column given to the size of its contents.
+\sa columnWidth(), setColumnWidth()
+*/
+void QTreeView::resizeColumnToContents(int column)
+{
+Q_D(QTreeView);
+d->executePostedLayout();
+if (column < 0 || column >= d->header->count())
+return;
+int contents = sizeHintForColumn(column);
+int header = d->header->isHidden() ? 0 : d->header->sectionSizeHint(column);
+d->header->resizeSection(column, qMax(contents, header));
+}
+/*!
+\obsolete
+\overload
+Sorts the model by the values in the given \a column.
+*/
+void QTreeView::sortByColumn(int column)
+{
+Q_D(QTreeView);
+sortByColumn(column, d->header->sortIndicatorOrder());
+}
+/*!
+\since 4.2
+Sets the model up for sorting by the values in the given \a column and \a order.
+\a column 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 sortingEnabled
+*/
+void QTreeView::sortByColumn(int column, Qt::SortOrder order)
+{
+Q_D(QTreeView);
+//If sorting is enabled  will emit a signal connected to _q_sortIndicatorChanged, which then actually sorts
+d->header->setSortIndicator(column, order);
+//If sorting is not enabled, force to sort now.
+if (!d->sortingEnabled)
+d->model->sort(column, order);
+}
+/*!
+\reimp
+*/
+void QTreeView::selectAll()
+{
+Q_D(QTreeView);
+if (!selectionModel())
+return;
+SelectionMode mode = d->selectionMode;
+d->executePostedLayout(); //make sure we lay out the items
+if (mode != SingleSelection && !d->viewItems.isEmpty()) {
+const QModelIndex &idx = d->viewItems.last().index;
+QModelIndex lastItemIndex = idx.sibling(idx.row(), d->model->columnCount(idx.parent()) - 1);
+d->select(d->viewItems.first().index, lastItemIndex,
+QItemSelectionModel::ClearAndSelect
+|QItemSelectionModel::Rows);
+}
+}
+/*!
+\since 4.2
+Expands all expandable items.
+Warning: if the model contains a large number of items,
+this function will take some time to execute.
+\sa collapseAll() expand()  collapse() setExpanded()
+*/
+void QTreeView::expandAll()
+{
+Q_D(QTreeView);
+d->viewItems.clear();
+d->expandedIndexes.clear();
+d->interruptDelayedItemsLayout();
+d->layout(-1);
+for (int i = 0; i < d->viewItems.count(); ++i) {
+if (d->viewItems[i].expanded)
+continue;
+d->viewItems[i].expanded = true;
+d->layout(i);
+QModelIndex idx = d->viewItems.at(i).index;
+d->expandedIndexes.insert(idx);
+}
+updateGeometries();
+d->viewport->update();
+}
+/*!
+\since 4.2
+Collapses all expanded items.
+\sa expandAll() expand()  collapse() setExpanded()
+*/
+void QTreeView::collapseAll()
+{
+Q_D(QTreeView);
+d->expandedIndexes.clear();
+doItemsLayout();
+}
+/*!
+\since 4.3
+Expands all expandable items to the given \a depth.
+\sa expandAll() collapseAll() expand()  collapse() setExpanded()
+*/
+void QTreeView::expandToDepth(int depth)
+{
+Q_D(QTreeView);
+d->viewItems.clear();
+d->expandedIndexes.clear();
+d->interruptDelayedItemsLayout();
+d->layout(-1);
+for (int i = 0; i < d->viewItems.count(); ++i) {
+if (d->viewItems.at(i).level <= (uint)depth) {
+d->viewItems[i].expanded = true;
+d->layout(i);
+d->storeExpanded(d->viewItems.at(i).index);
+}
+}
+updateGeometries();
+d->viewport->update();
+}
+/*!
+This function is called whenever \a{column}'s size is changed in
+the header. \a oldSize and \a newSize give the previous size and
+the new size in pixels.
+\sa setColumnWidth()
+*/
+void QTreeView::columnResized(int column, int /* oldSize */, int /* newSize */)
+{
+Q_D(QTreeView);
+d->columnsToUpdate.append(column);
+if (d->columnResizeTimerID == 0)
+d->columnResizeTimerID = startTimer(0);
+}
+/*!
+\reimp
+*/
+void QTreeView::updateGeometries()
+{
+Q_D(QTreeView);
+if (d->header) {
+if (d->geometryRecursionBlock)
+return;
+d->geometryRecursionBlock = true;
+QSize hint = d->header->isHidden() ? QSize(0, 0) : d->header->sizeHint();
+setViewportMargins(0, hint.height(), 0, 0);
+QRect vg = d->viewport->geometry();
+QRect geometryRect(vg.left(), vg.top() - hint.height(), vg.width(), hint.height());
+d->header->setGeometry(geometryRect);
+//d->header->setOffset(horizontalScrollBar()->value()); // ### bug ???
+QMetaObject::invokeMethod(d->header, "updateGeometries");
+d->updateScrollBars();
+d->geometryRecursionBlock = false;
+}
+QAbstractItemView::updateGeometries();
+}
+/*!
+Returns the size hint for the \a column's width or -1 if there is no
+model.
+If you need to set the width of a given column to a fixed value, call
+QHeaderView::resizeSection() on the view's header.
+If you reimplement this function in a subclass, note that the value you
+return is only used when resizeColumnToContents() is called. In that case,
+if a larger column width is required by either the view's header or
+the item delegate, that width will be used instead.
+\sa QWidget::sizeHint, header()
+*/
+int QTreeView::sizeHintForColumn(int column) const
+{
+Q_D(const QTreeView);
+d->executePostedLayout();
+if (d->viewItems.isEmpty())
+return -1;
+ensurePolished();
+int w = 0;
+QStyleOptionViewItemV4 option = d->viewOptionsV4();
+const QVector<QTreeViewItem> viewItems = d->viewItems;
+int start = 0;
+int end = viewItems.count();
+if(end > 1000) { //if we have too many item this function would be too slow.
+//we get a good approximation by only iterate over 1000 items.
+start = qMax(0, d->firstVisibleItem() - 100);
+end = qMin(end, start + 900);
+}
+for (int i = start; i < end; ++i) {
+if (viewItems.at(i).spanning)
+continue; // we have no good size hint
+QModelIndex index = viewItems.at(i).index;
+index = index.sibling(index.row(), column);
+QWidget *editor = d->editorForIndex(index).editor;
+if (editor && d->persistent.contains(editor)) {
+w = qMax(w, editor->sizeHint().width());
+int min = editor->minimumSize().width();
+int max = editor->maximumSize().width();
+w = qBound(min, w, max);
+}
+int hint = d->delegateForIndex(index)->sizeHint(option, index).width();
+w = qMax(w, hint + (column == 0 ? d->indentationForItem(i) : 0));
+}
+return w;
+}
+/*!
+Returns the size hint for the row indicated by \a index.
+\sa sizeHintForColumn(), uniformRowHeights()
+*/
+int QTreeView::indexRowSizeHint(const QModelIndex &index) const
+{
+Q_D(const QTreeView);
+if (!d->isIndexValid(index) || !d->itemDelegate)
+return 0;
+int start = -1;
+int end = -1;
+int count = d->header->count();
+bool emptyHeader = (count == 0);
+QModelIndex parent = index.parent();
+if (count && isVisible()) {
+// If the sections have moved, we end up checking too many or too few
+start = d->header->visualIndexAt(0);
+} else {
+// If the header has not been laid out yet, we use the model directly
+count = d->model->columnCount(parent);
+}
+if (isRightToLeft()) {
+start = (start == -1 ? count - 1 : start);
+end = 0;
+} else {
+start = (start == -1 ? 0 : start);
+end = count - 1;
+}
+if (end < start)
+qSwap(end, start);
+int height = -1;
+QStyleOptionViewItemV4 option = d->viewOptionsV4();
+// ### If we want word wrapping in the items,
+// ### we need to go through all the columns
+// ### and set the width of the column
+// Hack to speed up the function
+option.rect.setWidth(-1);
+for (int column = start; column <= end; ++column) {
+int logicalColumn = emptyHeader ? column : d->header->logicalIndex(column);
+if (d->header->isSectionHidden(logicalColumn))
+continue;
+QModelIndex idx = d->model->index(index.row(), logicalColumn, parent);
+if (idx.isValid()) {
+QWidget *editor = d->editorForIndex(idx).editor;
+if (editor && d->persistent.contains(editor)) {
+height = qMax(height, editor->sizeHint().height());
+int min = editor->minimumSize().height();
+int max = editor->maximumSize().height();
+height = qBound(min, height, max);
+}
+int hint = d->delegateForIndex(idx)->sizeHint(option, idx).height();
+height = qMax(height, hint);
+}
+}
+return height;
+}
+/*!
+\since 4.3
+Returns the height of the row indicated by the given \a index.
+\sa indexRowSizeHint()
+*/
+int QTreeView::rowHeight(const QModelIndex &index) const
+{
+Q_D(const QTreeView);
+d->executePostedLayout();
+int i = d->viewIndex(index);
+if (i == -1)
+return 0;
+return d->itemHeight(i);
+}
+/*!
+\internal
+*/
+void QTreeView::horizontalScrollbarAction(int action)
+{
+QAbstractItemView::horizontalScrollbarAction(action);
+}
+/*!
+\reimp
+*/
+bool QTreeView::isIndexHidden(const QModelIndex &index) const
+{
+return (isColumnHidden(index.column()) || isRowHidden(index.row(), index.parent()));
+}
+/*
+private implementation
+*/
+void QTreeViewPrivate::initialize()
+{
+Q_Q(QTreeView);
+updateStyledFrameWidths();
+q->setSelectionBehavior(QAbstractItemView::SelectRows);
+q->setSelectionMode(QAbstractItemView::SingleSelection);
+q->setHorizontalScrollMode(QAbstractItemView::ScrollPerPixel);
+q->setAttribute(Qt::WA_MacShowFocusRect);
+QHeaderView *header = new QHeaderView(Qt::Horizontal, q);
+header->setMovable(true);
+header->setStretchLastSection(true);
+header->setDefaultAlignment(Qt::AlignLeft|Qt::AlignVCenter);
+q->setHeader(header);
+#ifndef QT_NO_ANIMATION
+QObject::connect(&animatedOperation, SIGNAL(finished()), q, SLOT(_q_endAnimatedOperation()));
+#endif //QT_NO_ANIMATION
+}
+void QTreeViewPrivate::expand(int item, bool emitSignal)
+{
+Q_Q(QTreeView);
+if (item == -1 || viewItems.at(item).expanded)
+return;
+#ifndef QT_NO_ANIMATION
+if (emitSignal && animationsEnabled)
+prepareAnimatedOperation(item, QVariantAnimation::Forward);
+#endif //QT_NO_ANIMATION
+QAbstractItemView::State oldState = state;
+q->setState(QAbstractItemView::ExpandingState);
+const QModelIndex index = viewItems.at(item).index;
+storeExpanded(index);
+viewItems[item].expanded = true;
+layout(item);
+q->setState(oldState);
+if (model->canFetchMore(index))
+model->fetchMore(index);
+if (emitSignal) {
+emit q->expanded(index);
+#ifndef QT_NO_ANIMATION
+if (animationsEnabled)
+beginAnimatedOperation();
+#endif //QT_NO_ANIMATION
+}
+}
+void QTreeViewPrivate::collapse(int item, bool emitSignal)
+{
+Q_Q(QTreeView);
+if (item == -1 || expandedIndexes.isEmpty())
+return;
+//if the current item is now invisible, the autoscroll will expand the tree to see it, so disable the autoscroll
+delayedAutoScroll.stop();
+int total = viewItems.at(item).total;
+const QModelIndex &modelIndex = viewItems.at(item).index;
+if (!isPersistent(modelIndex))
+return; // if the index is not persistent, no chances it is expanded
+QSet<QPersistentModelIndex>::iterator it = expandedIndexes.find(modelIndex);
+if (it == expandedIndexes.end() || viewItems.at(item).expanded == false)
+return; // nothing to do
+#ifndef QT_NO_ANIMATION
+if (emitSignal && animationsEnabled)
+prepareAnimatedOperation(item, QVariantAnimation::Backward);
+#endif //QT_NO_ANIMATION
+QAbstractItemView::State oldState = state;
+q->setState(QAbstractItemView::CollapsingState);
+expandedIndexes.erase(it);
+viewItems[item].expanded = false;
+int index = item;
+QModelIndex parent = modelIndex;
+while (parent.isValid() && parent != root) {
+Q_ASSERT(index > -1);
+viewItems[index].total -= total;
+parent = parent.parent();
+index = viewIndex(parent);
+}
+viewItems.remove(item + 1, total); // collapse
+q->setState(oldState);
+if (emitSignal) {
+emit q->collapsed(modelIndex);
+#ifndef QT_NO_ANIMATION
+if (animationsEnabled)
+beginAnimatedOperation();
+#endif //QT_NO_ANIMATION
+}
+}
+#ifndef QT_NO_ANIMATION
+void QTreeViewPrivate::prepareAnimatedOperation(int item, QVariantAnimation::Direction direction)
+{
+animatedOperation.item = item;
+animatedOperation.viewport = viewport;
+animatedOperation.setDirection(direction);
+int top = coordinateForItem(item) + itemHeight(item);
+QRect rect = viewport->rect();
+rect.setTop(top);
+if (direction == QVariantAnimation::Backward) {
+const int limit = rect.height() * 2;
+int h = 0;
+int c = item + viewItems.at(item).total + 1;
+for (int i = item + 1; i < c && h < limit; ++i)
+h += itemHeight(i);
+rect.setHeight(h);
+animatedOperation.setEndValue(top + h);
+}
+animatedOperation.setStartValue(top);
+animatedOperation.before = renderTreeToPixmapForAnimation(rect);
+}
+void QTreeViewPrivate::beginAnimatedOperation()
+{
+Q_Q(QTreeView);
+QRect rect = viewport->rect();
+rect.setTop(animatedOperation.top());
+if (animatedOperation.direction() == QVariantAnimation::Forward) {
+const int limit = rect.height() * 2;
+int h = 0;
+int c = animatedOperation.item + viewItems.at(animatedOperation.item).total + 1;
+for (int i = animatedOperation.item + 1; i < c && h < limit; ++i)
+h += itemHeight(i);
+rect.setHeight(h);
+animatedOperation.setEndValue(animatedOperation.top() + h);
+}
+if (!rect.isEmpty()) {
+animatedOperation.after = renderTreeToPixmapForAnimation(rect);
+q->setState(QAbstractItemView::AnimatingState);
+animatedOperation.start(); //let's start the animation
+}
+}
+void QTreeViewPrivate::drawAnimatedOperation(QPainter *painter) const
+{
+const int start = animatedOperation.startValue().toInt(),
+end = animatedOperation.endValue().toInt(),
+current = animatedOperation.currentValue().toInt();
+bool collapsing = animatedOperation.direction() == QVariantAnimation::Backward;
+const QPixmap top = collapsing ? animatedOperation.before : animatedOperation.after;
+painter->drawPixmap(0, start, top, 0, end - current - 1, top.width(), top.height());
+const QPixmap bottom = collapsing ? animatedOperation.after : animatedOperation.before;
+painter->drawPixmap(0, current, bottom);
+}
+QPixmap QTreeViewPrivate::renderTreeToPixmapForAnimation(const QRect &rect) const
+{
+Q_Q(const QTreeView);
+QPixmap pixmap(rect.size());
+if (rect.size().isEmpty())
+return pixmap;
+pixmap.fill(Qt::transparent); //the base might not be opaque, and we don't want uninitialized pixels.
+QPainter painter(&pixmap);
+painter.fillRect(QRect(QPoint(0,0), rect.size()), q->palette().base());
+painter.translate(0, -rect.top());
+q->drawTree(&painter, QRegion(rect));
+painter.end();
+//and now let's render the editors the editors
+QStyleOptionViewItemV4 option = viewOptionsV4();
+for (QList<QEditorInfo>::const_iterator it = editors.constBegin(); it != editors.constEnd(); ++it) {
+QWidget *editor = it->editor;
+QModelIndex index = it->index;
+option.rect = q->visualRect(index);
+if (option.rect.isValid()) {
+if (QAbstractItemDelegate *delegate = delegateForIndex(index))
+delegate->updateEditorGeometry(editor, option, index);
+const QPoint pos = editor->pos();
+if (rect.contains(pos)) {
+editor->render(&pixmap, pos - rect.topLeft());
+//the animation uses pixmap to display the treeview's content
+//the editor is rendered on this pixmap and thus can (should) be hidden
+editor->hide();
+}
+}
+}
+return pixmap;
+}
+void QTreeViewPrivate::_q_endAnimatedOperation()
+{
+Q_Q(QTreeView);
+q->setState(QAbstractItemView::NoState);
+q->updateGeometries();
+viewport->update();
+}
+#endif //QT_NO_ANIMATION
+void QTreeViewPrivate::_q_modelAboutToBeReset()
+{
+viewItems.clear();
+}
+void QTreeViewPrivate::_q_columnsAboutToBeRemoved(const QModelIndex &parent, int start, int end)
+{
+if (start <= 0 && 0 <= end)
+viewItems.clear();
+QAbstractItemViewPrivate::_q_columnsAboutToBeRemoved(parent, start, end);
+}
+void QTreeViewPrivate::_q_columnsRemoved(const QModelIndex &parent, int start, int end)
+{
+if (start <= 0 && 0 <= end)
+doDelayedItemsLayout();
+QAbstractItemViewPrivate::_q_columnsRemoved(parent, start, end);
+}
+void QTreeViewPrivate::layout(int i)
+{
+Q_Q(QTreeView);
+QModelIndex current;
+QModelIndex parent = (i < 0) ? (QModelIndex)root : modelIndex(i);
+if (i>=0 && !parent.isValid()) {
+//modelIndex() should never return something invalid for the real items.
+//This can happen if columncount has been set to 0.
+//To avoid infinite loop we stop here.
+return;
+}
+int count = 0;
+if (model->hasChildren(parent)) {
+if (model->canFetchMore(parent))
+model->fetchMore(parent);
+count = model->rowCount(parent);
+}
+bool expanding = true;
+if (i == -1) {
+if (uniformRowHeights) {
+QModelIndex index = model->index(0, 0, parent);
+defaultItemHeight = q->indexRowSizeHint(index);
+}
+viewItems.resize(count);
+} else if (viewItems[i].total != (uint)count) {
+viewItems.insert(i + 1, count, QTreeViewItem()); // expand
+} else {
+expanding = false;
+}
+int first = i + 1;
+int level = (i >= 0 ? viewItems.at(i).level + 1 : 0);
+int hidden = 0;
+int last = 0;
+int children = 0;
+QTreeViewItem *item = 0;
+for (int j = first; j < first + count; ++j) {
+current = model->index(j - first, 0, parent);
+if (isRowHidden(current)) {
+++hidden;
+last = j - hidden + children;
+} else {
+last = j - hidden + children;
+if (item)
+item->hasMoreSiblings = true;
+item = &viewItems[last];
+item->index = current;
+item->level = level;
+item->height = 0;
+item->spanning = q->isFirstColumnSpanned(current.row(), parent);
+item->expanded = false;
+item->total = 0;
+item->hasMoreSiblings = false;
+if (isIndexExpanded(current)) {
+item->expanded = true;
+layout(last);
+item = &viewItems[last];
+children += item->total;
+item->hasChildren = item->total > 0;
+last = j - hidden + children;
+} else {
+item->hasChildren = hasVisibleChildren(current);
+}
+}
+}
+// remove hidden items
+if (hidden > 0)
+viewItems.remove(last + 1, hidden); // collapse
+if (!expanding)
+return; // nothing changed
+while (parent != root) {
+Q_ASSERT(i > -1);
+viewItems[i].total += count - hidden;
+parent = parent.parent();
+i = viewIndex(parent);
+}
+}
+int QTreeViewPrivate::pageUp(int i) const
+{
+int index = itemAtCoordinate(coordinateForItem(i) - viewport->height());
+return index == -1 ? 0 : index;
+}
+int QTreeViewPrivate::pageDown(int i) const
+{
+int index = itemAtCoordinate(coordinateForItem(i) + viewport->height());
+return index == -1 ? viewItems.count() - 1 : index;
+}
+int QTreeViewPrivate::indentationForItem(int item) const
+{
+if (item < 0 || item >= viewItems.count())
+return 0;
+int level = viewItems.at(item).level;
+if (rootDecoration)
+++level;
+return level * indent;
+}
+int QTreeViewPrivate::itemHeight(int item) const
+{
+if (uniformRowHeights)
+return defaultItemHeight;
+if (viewItems.isEmpty())
+return 0;
+const QModelIndex &index = viewItems.at(item).index;
+int height = viewItems.at(item).height;
+if (height <= 0 && index.isValid()) {
+height = q_func()->indexRowSizeHint(index);
+viewItems[item].height = height;
+}
+if (!index.isValid() || height < 0)
+return 0;
+return height;
+}
+/*!
+\internal
+Returns the viewport y coordinate for \a item.
+*/
+int QTreeViewPrivate::coordinateForItem(int item) const
+{
+if (verticalScrollMode == QAbstractItemView::ScrollPerPixel) {
+if (uniformRowHeights)
+return (item * defaultItemHeight) - vbar->value();
+// ### optimize (spans or caching)
+int y = 0;
+for (int i = 0; i < viewItems.count(); ++i) {
+if (i == item)
+return y - vbar->value();
+y += itemHeight(i);
+}
+} else { // ScrollPerItem
+int topViewItemIndex = vbar->value();
+if (uniformRowHeights)
+return defaultItemHeight * (item - topViewItemIndex);
+if (item >= topViewItemIndex) {
+// search in the visible area first and continue down
+// ### slow if the item is not visible
+int viewItemCoordinate = 0;
+int viewItemIndex = topViewItemIndex;
+while (viewItemIndex < viewItems.count()) {
+if (viewItemIndex == item)
+return viewItemCoordinate;
+viewItemCoordinate += itemHeight(viewItemIndex);
+++viewItemIndex;
+}
+// below the last item in the view
+Q_ASSERT(false);
+return viewItemCoordinate;
+} else {
+// search the area above the viewport (used for editor widgets)
+int viewItemCoordinate = 0;
+for (int viewItemIndex = topViewItemIndex; viewItemIndex > 0; --viewItemIndex) {
+if (viewItemIndex == item)
+return viewItemCoordinate;
+viewItemCoordinate -= itemHeight(viewItemIndex - 1);
+}
+return viewItemCoordinate;
+}
+}
+return 0;
+}
+/*!
+\internal
+Returns the index of the view item at the
+given viewport \a coordinate.
+\sa modelIndex()
+*/
+int QTreeViewPrivate::itemAtCoordinate(int coordinate) const
+{
+const int itemCount = viewItems.count();
+if (itemCount == 0)
+return -1;
+if (uniformRowHeights && defaultItemHeight <= 0)
+return -1;
+if (verticalScrollMode == QAbstractItemView::ScrollPerPixel) {
+if (uniformRowHeights) {
+const int viewItemIndex = (coordinate + vbar->value()) / defaultItemHeight;
+return ((viewItemIndex >= itemCount || viewItemIndex < 0) ? -1 : viewItemIndex);
+}
+// ### optimize
+int viewItemCoordinate = 0;
+const int contentsCoordinate = coordinate + vbar->value();
+for (int viewItemIndex = 0; viewItemIndex < viewItems.count(); ++viewItemIndex) {
+viewItemCoordinate += itemHeight(viewItemIndex);
+if (viewItemCoordinate >= contentsCoordinate)
+return (viewItemIndex >= itemCount ? -1 : viewItemIndex);
+}
+} else { // ScrollPerItem
+int topViewItemIndex = vbar->value();
+if (uniformRowHeights) {
+if (coordinate < 0)
+coordinate -= defaultItemHeight - 1;
+const int viewItemIndex = topViewItemIndex + (coordinate / defaultItemHeight);
+return ((viewItemIndex >= itemCount || viewItemIndex < 0) ? -1 : viewItemIndex);
+}
+if (coordinate >= 0) {
+// the coordinate is in or below the viewport
+int viewItemCoordinate = 0;
+for (int viewItemIndex = topViewItemIndex; viewItemIndex < viewItems.count(); ++viewItemIndex) {
+viewItemCoordinate += itemHeight(viewItemIndex);
+if (viewItemCoordinate > coordinate)
+return (viewItemIndex >= itemCount ? -1 : viewItemIndex);
+}
+} else {
+// the coordinate is above the viewport
+int viewItemCoordinate = 0;
+for (int viewItemIndex = topViewItemIndex; viewItemIndex >= 0; --viewItemIndex) {
+if (viewItemCoordinate <= coordinate)
+return (viewItemIndex >= itemCount ? -1 : viewItemIndex);
+viewItemCoordinate -= itemHeight(viewItemIndex);
+}
+}
+}
+return -1;
+}
+int QTreeViewPrivate::viewIndex(const QModelIndex &_index) const
+{
+if (!_index.isValid() || viewItems.isEmpty())
+return -1;
+const int totalCount = viewItems.count();
+const QModelIndex index = _index.sibling(_index.row(), 0);
+// A quick check near the last item to see if we are just incrementing
+const int start = lastViewedItem > 2 ? lastViewedItem - 2 : 0;
+const int end = lastViewedItem < totalCount - 2 ? lastViewedItem + 2 : totalCount;
+int row = index.row();
+for (int i = start; i < end; ++i) {
+const QModelIndex &idx = viewItems.at(i).index;
+if (idx.row() == row) {
+if (idx.internalId() == index.internalId()) {
+lastViewedItem = i;
+return i;
+}
+}
+}
+// NOTE: this function is slow if the item is outside the visible area
+// search in visible items first and below
+int t = firstVisibleItem();
+t = t > 100 ? t - 100 : 0; // start 100 items above the visible area
+for (int i = t; i < totalCount; ++i) {
+const QModelIndex &idx = viewItems.at(i).index;
+if (idx.row() == row) {
+if (idx.internalId() == index.internalId()) {
+lastViewedItem = i;
+return i;
+}
+}
+}
+// search from top to first visible
+for (int j = 0; j < t; ++j) {
+const QModelIndex &idx = viewItems.at(j).index;
+if (idx.row() == row) {
+if (idx.internalId() == index.internalId()) {
+lastViewedItem = j;
+return j;
+}
+}
+}
+// nothing found
+return -1;
+}
+QModelIndex QTreeViewPrivate::modelIndex(int i, int column) const
+{
+if (i < 0 || i >= viewItems.count())
+return QModelIndex();
+QModelIndex ret = viewItems.at(i).index;
+if (column)
+ret = ret.sibling(ret.row(), column);
+return ret;
+}
+int QTreeViewPrivate::firstVisibleItem(int *offset) const
+{
+const int value = vbar->value();
+if (verticalScrollMode == QAbstractItemView::ScrollPerItem) {
+if (offset)
+*offset = 0;
+return (value < 0 || value >= viewItems.count()) ? -1 : value;
+}
+// ScrollMode == ScrollPerPixel
+if (uniformRowHeights) {
+if (!defaultItemHeight)
+return -1;
+if (offset)
+*offset = -(value % defaultItemHeight);
+return value / defaultItemHeight;
+}
+int y = 0; // ### optimize (use spans ?)
+for (int i = 0; i < viewItems.count(); ++i) {
+y += itemHeight(i); // the height value is cached
+if (y > value) {
+if (offset)
+*offset = y - value - itemHeight(i);
+return i;
+}
+}
+return -1;
+}
+int QTreeViewPrivate::columnAt(int x) const
+{
+return header->logicalIndexAt(x);
+}
+void QTreeViewPrivate::relayout(const QModelIndex &parent)
+{
+Q_Q(QTreeView);
+// do a local relayout of the items
+if (parent.isValid()) {
+int parentViewIndex = viewIndex(parent);
+if (parentViewIndex > -1 && viewItems.at(parentViewIndex).expanded) {
+collapse(parentViewIndex, false); // remove the current layout
+expand(parentViewIndex, false); // do the relayout
+q->updateGeometries();
+viewport->update();
+}
+} else {
+viewItems.clear();
+q->doItemsLayout();
+}
+}
+void QTreeViewPrivate::updateScrollBars()
+{
+Q_Q(QTreeView);
+QSize viewportSize = viewport->size();
+if (!viewportSize.isValid())
+viewportSize = QSize(0, 0);
+int itemsInViewport = 0;
+if (uniformRowHeights) {
+if (defaultItemHeight <= 0)
+itemsInViewport = viewItems.count();
+else
+itemsInViewport = viewportSize.height() / defaultItemHeight;
+} else {
+const int itemsCount = viewItems.count();
+const int viewportHeight = viewportSize.height();
+for (int height = 0, item = itemsCount - 1; item >= 0; --item) {
+height += itemHeight(item);
+if (height > viewportHeight)
+break;
+++itemsInViewport;
+}
+}
+if (verticalScrollMode == QAbstractItemView::ScrollPerItem) {
+if (!viewItems.isEmpty())
+itemsInViewport = qMax(1, itemsInViewport);
+vbar->setRange(0, viewItems.count() - itemsInViewport);
+vbar->setPageStep(itemsInViewport);
+vbar->setSingleStep(1);
+} else { // scroll per pixel
+int contentsHeight = 0;
+if (uniformRowHeights) {
+contentsHeight = defaultItemHeight * viewItems.count();
+} else { // ### optimize (spans or caching)
+for (int i = 0; i < viewItems.count(); ++i)
+contentsHeight += itemHeight(i);
+}
+vbar->setRange(0, contentsHeight - viewportSize.height());
+vbar->setPageStep(viewportSize.height());
+vbar->setSingleStep(qMax(viewportSize.height() / (itemsInViewport + 1), 2));
+}
+const int columnCount = header->count();
+const int viewportWidth = viewportSize.width();
+int columnsInViewport = 0;
+for (int width = 0, column = columnCount - 1; column >= 0; --column) {
+int logical = header->logicalIndex(column);
+width += header->sectionSize(logical);
+if (width > viewportWidth)
+break;
+++columnsInViewport;
+}
+if (columnCount > 0)
+columnsInViewport = qMax(1, columnsInViewport);
+if (horizontalScrollMode == QAbstractItemView::ScrollPerItem) {
+hbar->setRange(0, columnCount - columnsInViewport);
+hbar->setPageStep(columnsInViewport);
+hbar->setSingleStep(1);
+} else { // scroll per pixel
+const int horizontalLength = header->length();
+const QSize maxSize = q->maximumViewportSize();
+if (maxSize.width() >= horizontalLength && vbar->maximum() <= 0)
+viewportSize = maxSize;
+hbar->setPageStep(viewportSize.width());
+hbar->setRange(0, qMax(horizontalLength - viewportSize.width(), 0));
+hbar->setSingleStep(qMax(viewportSize.width() / (columnsInViewport + 1), 2));
+}
+}
+int QTreeViewPrivate::itemDecorationAt(const QPoint &pos) const
+{
+executePostedLayout();
+int x = pos.x();
+int column = header->logicalIndexAt(x);
+if (column != 0)
+return -1; // no logical index at x
+int viewItemIndex = itemAtCoordinate(pos.y());
+QRect returning = itemDecorationRect(modelIndex(viewItemIndex));
+if (!returning.contains(pos))
+return -1;
+return viewItemIndex;
+}
+QRect QTreeViewPrivate::itemDecorationRect(const QModelIndex &index) const
+{
+Q_Q(const QTreeView);
+if (!rootDecoration && index.parent() == root)
+return QRect(); // no decoration at root
+int viewItemIndex = viewIndex(index);
+if (viewItemIndex < 0 || !hasVisibleChildren(viewItems.at(viewItemIndex).index))
+return QRect();
+int itemIndentation = indentationForItem(viewItemIndex);
+int position = header->sectionViewportPosition(0);
+int size = header->sectionSize(0);
+QRect rect;
+if (q->isRightToLeft())
+rect = QRect(position + size - itemIndentation, coordinateForItem(viewItemIndex),
+indent, itemHeight(viewItemIndex));
+else
+rect = QRect(position + itemIndentation - indent, coordinateForItem(viewItemIndex),
+indent, itemHeight(viewItemIndex));
+QStyleOption opt;
+opt.initFrom(q);
+opt.rect = rect;
+return q->style()->subElementRect(QStyle::SE_TreeViewDisclosureItem, &opt, q);
+}
+QList<QPair<int, int> > QTreeViewPrivate::columnRanges(const QModelIndex &topIndex,
+const QModelIndex &bottomIndex) const
+{
+const int topVisual = header->visualIndex(topIndex.column()),
+bottomVisual = header->visualIndex(bottomIndex.column());
+const int start = qMin(topVisual, bottomVisual);
+const int end = qMax(topVisual, bottomVisual);
+QList<int> logicalIndexes;
+//we iterate over the visual indexes to get the logical indexes
+for (int c = start; c <= end; c++) {
+const int logical = header->logicalIndex(c);
+if (!header->isSectionHidden(logical)) {
+logicalIndexes << logical;
+}
+}
+//let's sort the list
+qSort(logicalIndexes.begin(), logicalIndexes.end());
+QList<QPair<int, int> > ret;
+QPair<int, int> current;
+current.first = -2; // -1 is not enough because -1+1 = 0
+current.second = -2;
+for(int i = 0; i < logicalIndexes.count(); ++i) {
+const int logicalColumn = logicalIndexes.at(i);
+if (current.second + 1 != logicalColumn) {
+if (current.first != -2) {
+//let's save the current one
+ret += current;
+}
+//let's start a new one
+current.first = current.second = logicalColumn;
+} else {
+current.second++;
+}
+}
+//let's get the last range
+if (current.first != -2) {
+ret += current;
+}
+return ret;
+}
+void QTreeViewPrivate::select(const QModelIndex &topIndex, const QModelIndex &bottomIndex,
+QItemSelectionModel::SelectionFlags command)
+{
+Q_Q(QTreeView);
+QItemSelection selection;
+const int top = viewIndex(topIndex),
+bottom = viewIndex(bottomIndex);
+const QList< QPair<int, int> > colRanges = columnRanges(topIndex, bottomIndex);
+QList< QPair<int, int> >::const_iterator it;
+for (it = colRanges.begin(); it != colRanges.end(); ++it) {
+const int left = (*it).first,
+right = (*it).second;
+QModelIndex previous;
+QItemSelectionRange currentRange;
+QStack<QItemSelectionRange> rangeStack;
+for (int i = top; i <= bottom; ++i) {
+QModelIndex index = modelIndex(i);
+QModelIndex parent = index.parent();
+QModelIndex previousParent = previous.parent();
+if (previous.isValid() && parent == previousParent) {
+// same parent
+if (qAbs(previous.row() - index.row()) > 1) {
+//a hole (hidden index inside a range) has been detected
+if (currentRange.isValid()) {
+selection.append(currentRange);
+}
+//let's start a new range
+currentRange = QItemSelectionRange(index.sibling(index.row(), left), index.sibling(index.row(), right));
+} else {
+QModelIndex tl = model->index(currentRange.top(), currentRange.left(),
+currentRange.parent());
+currentRange = QItemSelectionRange(tl, index.sibling(index.row(), right));
+}
+} else if (previous.isValid() && parent == model->index(previous.row(), 0, previousParent)) {
+// item is child of previous
+rangeStack.push(currentRange);
+currentRange = QItemSelectionRange(index.sibling(index.row(), left), index.sibling(index.row(), right));
+} else {
+if (currentRange.isValid())
+selection.append(currentRange);
+if (rangeStack.isEmpty()) {
+currentRange = QItemSelectionRange(index.sibling(index.row(), left), index.sibling(index.row(), right));
+} else {
+currentRange = rangeStack.pop();
+index = currentRange.bottomRight(); //let's resume the range
+--i; //we process again the current item
+}
+}
+previous = index;
+}
+if (currentRange.isValid())
+selection.append(currentRange);
+for (int i = 0; i < rangeStack.count(); ++i)
+selection.append(rangeStack.at(i));
+}
+q->selectionModel()->select(selection, command);
+}
+QPair<int,int> QTreeViewPrivate::startAndEndColumns(const QRect &rect) const
+{
+Q_Q(const QTreeView);
+int start = header->visualIndexAt(rect.left());
+int end = header->visualIndexAt(rect.right());
+if (q->isRightToLeft()) {
+start = (start == -1 ? header->count() - 1 : start);
+end = (end == -1 ? 0 : end);
+} else {
+start = (start == -1 ? 0 : start);
+end = (end == -1 ? header->count() - 1 : end);
+}
+return qMakePair<int,int>(qMin(start, end), qMax(start, end));
+}
+bool QTreeViewPrivate::hasVisibleChildren(const QModelIndex& parent) const
+{
+Q_Q(const QTreeView);
+if (model->hasChildren(parent)) {
+if (hiddenIndexes.isEmpty())
+return true;
+if (q->isIndexHidden(parent))
+return false;
+int rowCount = model->rowCount(parent);
+for (int i = 0; i < rowCount; ++i) {
+if (!q->isRowHidden(i, parent))
+return true;
+}
+if (rowCount == 0)
+return true;
+}
+return false;
+}
+void QTreeViewPrivate::rowsRemoved(const QModelIndex &parent,
+int start, int end, bool after)
+{
+Q_Q(QTreeView);
+// if we are going to do a complete relayout anyway, there is no need to update
+if (delayedPendingLayout) {
+_q_rowsRemoved(parent, start, end);
+return;
+}
+const int parentItem = viewIndex(parent);
+if ((parentItem != -1) || (parent == root)) {
+const uint childLevel = (parentItem == -1)
+? uint(0) : viewItems.at(parentItem).level + 1;
+Q_UNUSED(childLevel); // unused in release mode, used in assert below
+const int firstChildItem = parentItem + 1;
+int lastChildItem = firstChildItem + ((parentItem == -1)
+? viewItems.count()
+: viewItems.at(parentItem).total) - 1;
+const int delta = end - start + 1;
+int previousSibiling = -1;
+int removedCount = 0;
+for (int item = firstChildItem; item <= lastChildItem; ) {
+Q_ASSERT(viewItems.at(item).level == childLevel);
+const QModelIndex modelIndex = viewItems.at(item).index;
+//Q_ASSERT(modelIndex.parent() == parent);
+const int count = viewItems.at(item).total + 1;
+if (modelIndex.row() < start) {
+previousSibiling = item;
+// not affected by the removal
+item += count;
+} else if (modelIndex.row() <= end) {
+// removed
+viewItems.remove(item, count);
+removedCount += count;
+lastChildItem -= count;
+} else {
+if (after) {
+// moved; update the model index
+viewItems[item].index = model->index(
+modelIndex.row() - delta, modelIndex.column(), parent);
+}
+item += count;
+}
+}
+if (previousSibiling != -1 && after && model->rowCount(parent) == start)
+viewItems[previousSibiling].hasMoreSiblings = false;
+if (parentItem != -1) {
+if (viewItems.at(parentItem).expanded) {
+updateChildCount(parentItem, -removedCount);
+if (viewItems.at(parentItem).total == 0)
+viewItems[parentItem].hasChildren = false; //every children have been removed;
+} else if (viewItems[parentItem].hasChildren && !hasVisibleChildren(parent)) {
+viewItems[parentItem].hasChildren = false;
+}
+}
+if (after) {
+q->updateGeometries();
+viewport->update();
+} else {
+//we have removed items: we should at least update the scroll bar values.
+// They are used to determine the item geometry.
+updateScrollBars();
+}
+} else {
+// If an ancestor of root is removed then relayout
+QModelIndex idx = root;
+while (idx.isValid()) {
+idx = idx.parent();
+if (idx == parent) {
+doDelayedItemsLayout();
+break;
+}
+}
+}
+_q_rowsRemoved(parent, start, end);
+QSet<QPersistentModelIndex>::iterator it = expandedIndexes.begin();
+while (it != expandedIndexes.constEnd()) {
+if (!it->isValid())
+it = expandedIndexes.erase(it);
+else
+++it;
+}
+it = hiddenIndexes.begin();
+while (it != hiddenIndexes.constEnd()) {
+if (!it->isValid())
+it = hiddenIndexes.erase(it);
+else
+++it;
+}
+}
+void QTreeViewPrivate::updateChildCount(const int parentItem, const int delta)
+{
+if ((parentItem != -1) && delta) {
+int level = viewItems.at(parentItem).level;
+int item = parentItem;
+do {
+Q_ASSERT(item >= 0);
+for ( ; int(viewItems.at(item).level) != level; --item) ;
+viewItems[item].total += delta;
+--level;
+} while (level >= 0);
+}
+}
+void QTreeViewPrivate::_q_sortIndicatorChanged(int column, Qt::SortOrder order)
+{
+model->sort(column, order);
+}
+/*!
+\reimp
+*/
+void QTreeView::currentChanged(const QModelIndex &current, const QModelIndex &previous)
+{
+#ifndef QT_NO_ACCESSIBILITY
+if (QAccessible::isActive()) {
+int entry = visualIndex(current) + 1;
+if (header())
+++entry;
+QAccessible::updateAccessibility(viewport(), entry, QAccessible::Focus);
+}
+#endif
+QAbstractItemView::currentChanged(current, previous);
+if (allColumnsShowFocus()) {
+if (previous.isValid()) {
+QRect previousRect = visualRect(previous);
+previousRect.setX(0);
+previousRect.setWidth(viewport()->width());
+viewport()->update(previousRect);
+}
+if (current.isValid()) {
+QRect currentRect = visualRect(current);
+currentRect.setX(0);
+currentRect.setWidth(viewport()->width());
+viewport()->update(currentRect);
+}
+}
+}
+/*!
+\reimp
+*/
+void QTreeView::selectionChanged(const QItemSelection &selected,
+const QItemSelection &deselected)
+{
+#ifndef QT_NO_ACCESSIBILITY
+if (QAccessible::isActive()) {
+// ### does not work properly for selection ranges.
+QModelIndex sel = selected.indexes().value(0);
+if (sel.isValid()) {
+int entry = visualIndex(sel) + 1;
+if (header())
+++entry;
+QAccessible::updateAccessibility(viewport(), entry, QAccessible::Selection);
+}
+QModelIndex desel = deselected.indexes().value(0);
+if (desel.isValid()) {
+int entry = visualIndex(desel) + 1;
+if (header())
+++entry;
+QAccessible::updateAccessibility(viewport(), entry, QAccessible::SelectionRemove);
+}
+}
+#endif
+QAbstractItemView::selectionChanged(selected, deselected);
+}
+int QTreeView::visualIndex(const QModelIndex &index) const
+{
+Q_D(const QTreeView);
+d->executePostedLayout();
+return d->viewIndex(index);
+}
+QT_END_NAMESPACE
+#include "moc_qtreeview.cpp"
+#endif // QT_NO_TREEVIEW