Long live Qt 4.5!

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diff --git a/src/gui/itemviews/qcolumnview.cpp b/src/gui/itemviews/qcolumnview.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <qglobal.h>
+
+#ifndef QT_NO_COLUMNVIEW
+
+#include "qcolumnview.h"
+#include "qcolumnview_p.h"
+#include "qcolumnviewgrip_p.h"
+
+#include <qlistview.h>
+#include <qabstractitemdelegate.h>
+#include <qscrollbar.h>
+#include <qpainter.h>
+#include <qdebug.h>
+#include <qpainterpath.h>
+
+QT_BEGIN_NAMESPACE
+
+#define ANIMATION_DURATION_MSEC 150
+
+/*!
+    \since 4.3
+    \class QColumnView
+    \brief The QColumnView class provides a model/view implementation of a column view.
+    \ingroup model-view
+    \ingroup advanced
+    \mainclass
+
+    QColumnView displays a model in a number of QListViews, one for each
+    hierarchy in the tree.  This is sometimes referred to as a cascading list.
+
+    The QColumnView class is one of the \l{Model/View Classes}
+    and is part of Qt's \l{Model/View Programming}{model/view framework}.
+
+    QColumnView implements the interfaces defined by the
+    QAbstractItemView class to allow it to display data provided by
+    models derived from the QAbstractItemModel class.
+
+    \image qcolumnview.png
+
+    \sa \link model-view-programming.html Model/View Programming\endlink
+*/
+
+/*!
+    Constructs a column view with a \a parent to represent a model's
+    data. Use setModel() to set the model.
+
+    \sa QAbstractItemModel
+*/
+QColumnView::QColumnView(QWidget * parent)
+:  QAbstractItemView(*new QColumnViewPrivate, parent)
+{
+    Q_D(QColumnView);
+    d->initialize();
+}
+
+/*!
+    \internal
+*/
+QColumnView::QColumnView(QColumnViewPrivate & dd, QWidget * parent)
+:  QAbstractItemView(dd, parent)
+{
+    Q_D(QColumnView);
+    d->initialize();
+}
+
+void QColumnViewPrivate::initialize()
+{
+    Q_Q(QColumnView);
+    q->setTextElideMode(Qt::ElideMiddle);
+    q->connect(&currentAnimation, SIGNAL(frameChanged(int)),
+            q->horizontalScrollBar(), SLOT(setValue(int)));
+    q->connect(&currentAnimation, SIGNAL(finished()), q, SLOT(_q_changeCurrentColumn()));
+    delete itemDelegate;
+    q->setItemDelegate(new QColumnViewDelegate(q));
+}
+
+/*!
+    Destroys the column view.
+*/
+QColumnView::~QColumnView()
+{
+}
+
+/*!
+    \property QColumnView::resizeGripsVisible
+    \brief the way to specify if the list views gets resize grips or not
+
+    By default, \c visible is set to true
+
+    \sa setRootIndex()
+*/
+void QColumnView::setResizeGripsVisible(bool visible)
+{
+    Q_D(QColumnView);
+    if (d->showResizeGrips == visible)
+        return;
+    d->showResizeGrips = visible;
+    for (int i = 0; i < d->columns.count(); ++i) {
+        QAbstractItemView *view = d->columns[i];
+        if (visible) {
+            QColumnViewGrip *grip = new QColumnViewGrip(view);
+            view->setCornerWidget(grip);
+            connect(grip, SIGNAL(gripMoved(int)), this, SLOT(_q_gripMoved(int)));
+        } else {
+            QWidget *widget = view->cornerWidget();
+            view->setCornerWidget(0);
+            widget->deleteLater();
+        }
+    }
+}
+
+bool QColumnView::resizeGripsVisible() const
+{
+    Q_D(const QColumnView);
+    return d->showResizeGrips;
+}
+
+/*!
+    \reimp
+*/
+void QColumnView::setModel(QAbstractItemModel *model)
+{
+    Q_D(QColumnView);
+    if (model == d->model)
+        return;
+    d->closeColumns();
+    QAbstractItemView::setModel(model);
+}
+
+/*!
+    \reimp
+*/
+void QColumnView::setRootIndex(const QModelIndex &index)
+{
+    Q_D(QColumnView);
+    if (!model())
+        return;
+
+    d->closeColumns();
+    Q_ASSERT(d->columns.count() == 0);
+
+    QAbstractItemView *view = d->createColumn(index, true);
+    if (view->selectionModel())
+        view->selectionModel()->deleteLater();
+    if (view->model())
+        view->setSelectionModel(selectionModel());
+
+    QAbstractItemView::setRootIndex(index);
+    d->updateScrollbars();
+}
+
+/*!
+    \reimp
+*/
+bool QColumnView::isIndexHidden(const QModelIndex &index) const
+{
+    Q_UNUSED(index);
+    return false;
+}
+
+/*!
+    \reimp
+*/
+QModelIndex QColumnView::indexAt(const QPoint &point) const
+{
+    Q_D(const QColumnView);
+    for (int i = 0; i < d->columns.size(); ++i) {
+        QPoint topLeft = d->columns.at(i)->frameGeometry().topLeft();
+        QPoint adjustedPoint(point.x() - topLeft.x(), point.y() - topLeft.y());
+        QModelIndex index = d->columns.at(i)->indexAt(adjustedPoint);
+        if (index.isValid())
+            return index;
+    }
+    return QModelIndex();
+}
+
+/*!
+    \reimp
+*/
+QRect QColumnView::visualRect(const QModelIndex &index) const
+{
+    if (!index.isValid())
+        return QRect();
+
+    Q_D(const QColumnView);
+    for (int i = 0; i < d->columns.size(); ++i) {
+        QRect rect = d->columns.at(i)->visualRect(index);
+        if (!rect.isNull()) {
+            rect.translate(d->columns.at(i)->frameGeometry().topLeft());
+            return rect;
+        }
+    }
+    return QRect();
+}
+
+/*!
+    \reimp
+ */
+void QColumnView::scrollContentsBy(int dx, int dy)
+{
+    Q_D(QColumnView);
+    if (d->columns.isEmpty() || dx == 0)
+        return;
+
+    dx = isRightToLeft() ? -dx : dx;
+    for (int i = 0; i < d->columns.count(); ++i)
+        d->columns.at(i)->move(d->columns.at(i)->x() + dx, 0);
+    d->offset += dx;
+    QAbstractItemView::scrollContentsBy(dx, dy);
+}
+
+/*!
+    \reimp
+*/
+void QColumnView::scrollTo(const QModelIndex &index, ScrollHint hint)
+{
+    Q_D(QColumnView);
+    Q_UNUSED(hint);
+    if (!index.isValid() || d->columns.isEmpty())
+        return;
+
+    if (d->currentAnimation.state() == QTimeLine::Running)
+        return;
+
+    d->currentAnimation.stop();
+
+    // Fill up what is needed to get to index
+    d->closeColumns(index, true);
+
+    QModelIndex indexParent = index.parent();
+    // Find the left edge of the column that contains index
+    int currentColumn = 0;
+    int leftEdge = 0;
+    while (currentColumn < d->columns.size()) {
+        if (indexParent == d->columns.at(currentColumn)->rootIndex())
+            break;
+        leftEdge += d->columns.at(currentColumn)->width();
+        ++currentColumn;
+    }
+
+    // Don't let us scroll above the root index
+    if (currentColumn == d->columns.size())
+        return;
+
+    int indexColumn = currentColumn;
+    // Find the width of what we want to show (i.e. the right edge)
+    int visibleWidth = d->columns.at(currentColumn)->width();
+    // We want to always try to show two columns
+    if (currentColumn + 1 < d->columns.size()) {
+        ++currentColumn;
+        visibleWidth += d->columns.at(currentColumn)->width();
+    }
+
+    int rightEdge = leftEdge + visibleWidth;
+    if (isRightToLeft()) {
+        leftEdge = viewport()->width() - leftEdge;
+        rightEdge = leftEdge - visibleWidth;
+        qSwap(rightEdge, leftEdge);
+    }
+
+    // If it is already visible don't animate
+    if (leftEdge > -horizontalOffset()
+        && rightEdge <= ( -horizontalOffset() + viewport()->size().width())) {
+            d->columns.at(indexColumn)->scrollTo(index);
+            d->_q_changeCurrentColumn();
+            return;
+    }
+
+    int newScrollbarValue = 0;
+    if (isRightToLeft()) {
+        if (leftEdge < 0) {
+            // scroll to the right
+            newScrollbarValue = viewport()->size().width() - leftEdge;
+        } else {
+            // scroll to the left
+            newScrollbarValue = rightEdge + horizontalOffset();
+        }
+    } else {
+        if (leftEdge > -horizontalOffset()) {
+            // scroll to the right
+            newScrollbarValue = rightEdge - viewport()->size().width();
+        } else {
+            // scroll to the left
+            newScrollbarValue = leftEdge;
+        }
+    }
+
+    //horizontalScrollBar()->setValue(newScrollbarValue);
+    //d->_q_changeCurrentColumn();
+    //return;
+    // or do the following currentAnimation
+
+    int oldValue = horizontalScrollBar()->value();
+
+    if (oldValue < newScrollbarValue) {
+        d->currentAnimation.setFrameRange(oldValue, newScrollbarValue);
+        d->currentAnimation.setDirection(QTimeLine::Forward);
+        d->currentAnimation.setCurrentTime(0);
+    } else {
+        d->currentAnimation.setFrameRange(newScrollbarValue, oldValue);
+        d->currentAnimation.setDirection(QTimeLine::Backward);
+    }
+    d->currentAnimation.start();
+}
+
+/*!
+    \reimp
+    Move left should go to the parent index
+    Move right should go to the child index or down if there is no child
+*/
+QModelIndex QColumnView::moveCursor(CursorAction cursorAction, Qt::KeyboardModifiers modifiers)
+{
+    // the child views which have focus get to deal with this first and if
+    // they don't accept it then it comes up this view and we only grip left/right
+    Q_UNUSED(modifiers);
+    if (!model())
+        return QModelIndex();
+
+    QModelIndex current = currentIndex();
+    if (isRightToLeft()) {
+        if (cursorAction == MoveLeft)
+            cursorAction = MoveRight;
+        else if (cursorAction == MoveRight)
+            cursorAction = MoveLeft;
+    }
+    switch (cursorAction) {
+    case MoveLeft:
+        if (current.parent().isValid() && current.parent() != rootIndex())
+            return (current.parent());
+        else
+            return current;
+        break;
+
+    case MoveRight:
+        if (model()->hasChildren(current))
+            return model()->index(0, 0, current);
+        else
+            return current.sibling(current.row() + 1, current.column());
+        break;
+
+    default:
+        break;
+    }
+
+    return QModelIndex();
+}
+
+/*!
+    \reimp
+*/
+void QColumnView::resizeEvent(QResizeEvent *event)
+{
+    Q_D(QColumnView);
+    d->doLayout();
+    d->updateScrollbars();
+    if (!isRightToLeft()) {
+        int diff = event->oldSize().width() - event->size().width();
+        if (diff < 0 && horizontalScrollBar()->isVisible()
+            && horizontalScrollBar()->value() == horizontalScrollBar()->maximum()) {
+            horizontalScrollBar()->setMaximum(horizontalScrollBar()->maximum() + diff);
+        }
+    }
+    QAbstractItemView::resizeEvent(event);
+}
+
+/*!
+    \internal
+*/
+void QColumnViewPrivate::updateScrollbars()
+{
+    Q_Q(QColumnView);
+    if (currentAnimation.state() == QTimeLine::Running)
+        return;
+
+    // find the total horizontal length of the laid out columns
+    int horizontalLength = 0;
+    if (!columns.isEmpty()) {
+        horizontalLength = (columns.last()->x() + columns.last()->width()) - columns.first()->x();
+        if (horizontalLength <= 0) // reverse mode
+            horizontalLength = (columns.first()->x() + columns.first()->width()) - columns.last()->x();
+    }
+
+    QSize viewportSize = q->viewport()->size();
+    if (horizontalLength < viewportSize.width() && q->horizontalScrollBar()->value() == 0) {
+        q->horizontalScrollBar()->setRange(0, 0);
+    } else {
+        int visibleLength = qMin(horizontalLength + q->horizontalOffset(), viewportSize.width());
+        int hiddenLength = horizontalLength - visibleLength;
+        if (hiddenLength != q->horizontalScrollBar()->maximum())
+            q->horizontalScrollBar()->setRange(0, hiddenLength);
+    }
+    if (!columns.isEmpty()) {
+        int pageStepSize = columns.at(0)->width();
+        if (pageStepSize != q->horizontalScrollBar()->pageStep())
+            q->horizontalScrollBar()->setPageStep(pageStepSize);
+    }
+    bool visible = (q->horizontalScrollBar()->maximum() > 0);
+    if (visible != q->horizontalScrollBar()->isVisible())
+        q->horizontalScrollBar()->setVisible(visible);
+}
+
+/*!
+    \reimp
+*/
+int QColumnView::horizontalOffset() const
+{
+    Q_D(const QColumnView);
+    return d->offset;
+}
+
+/*!
+    \reimp
+*/
+int QColumnView::verticalOffset() const
+{
+    return 0;
+}
+
+/*!
+    \reimp
+*/
+QRegion QColumnView::visualRegionForSelection(const QItemSelection &selection) const
+{
+    int ranges = selection.count();
+
+    if (ranges == 0)
+        return QRect();
+
+    // Note that we use the top and bottom functions of the selection range
+    // since the data is stored in rows.
+    int firstRow = selection.at(0).top();
+    int lastRow = selection.at(0).top();
+    for (int i = 0; i < ranges; ++i) {
+        firstRow = qMin(firstRow, selection.at(i).top());
+        lastRow = qMax(lastRow, selection.at(i).bottom());
+    }
+
+    QModelIndex firstIdx = model()->index(qMin(firstRow, lastRow), 0, rootIndex());
+    QModelIndex lastIdx = model()->index(qMax(firstRow, lastRow), 0, rootIndex());
+
+    if (firstIdx == lastIdx)
+        return visualRect(firstIdx);
+
+    QRegion firstRegion = visualRect(firstIdx);
+    QRegion lastRegion = visualRect(lastIdx);
+    return firstRegion.unite(lastRegion);
+}
+
+/*!
+    \reimp
+*/
+void QColumnView::setSelection(const QRect &rect, QItemSelectionModel::SelectionFlags command)
+{
+    Q_UNUSED(rect);
+    Q_UNUSED(command);
+}
+
+/*!
+    \reimp
+*/
+void QColumnView::setSelectionModel(QItemSelectionModel *newSelectionModel)
+{
+    Q_D(const QColumnView);
+    for (int i = 0; i < d->columns.size(); ++i) {
+        if (d->columns.at(i)->selectionModel() == selectionModel()) {
+            d->columns.at(i)->setSelectionModel(newSelectionModel);
+            break;
+        }
+    }
+    QAbstractItemView::setSelectionModel(newSelectionModel);
+}
+
+/*!
+    \reimp
+*/
+QSize QColumnView::sizeHint() const
+{
+    Q_D(const QColumnView);
+    QSize sizeHint;
+    for (int i = 0; i < d->columns.size(); ++i) {
+        sizeHint += d->columns.at(i)->sizeHint();
+    }
+    return sizeHint.expandedTo(QAbstractItemView::sizeHint());
+}
+
+/*!
+    \internal
+    Move all widgets from the corner grip and to the right
+  */
+void QColumnViewPrivate::_q_gripMoved(int offset)
+{
+    Q_Q(QColumnView);
+
+    QObject *grip = q->sender();
+    Q_ASSERT(grip);
+
+    if (q->isRightToLeft())
+        offset = -1 * offset;
+
+    bool found = false;
+    for (int i = 0; i < columns.size(); ++i) {
+        if (!found && columns.at(i)->cornerWidget() == grip) {
+            found = true;
+            columnSizes[i] = columns.at(i)->width();
+            if (q->isRightToLeft())
+                columns.at(i)->move(columns.at(i)->x() + offset, 0);
+            continue;
+        }
+        if (!found)
+            continue;
+
+        int currentX = columns.at(i)->x();
+        columns.at(i)->move(currentX + offset, 0);
+    }
+
+    updateScrollbars();
+}
+
+/*!
+    \internal
+
+    Find where the current columns intersect parent's columns
+
+    Delete any extra columns and insert any needed columns.
+  */
+void QColumnViewPrivate::closeColumns(const QModelIndex &parent, bool build)
+{
+    if (columns.isEmpty())
+        return;
+
+    bool clearAll = !parent.isValid();
+    bool passThroughRoot = false;
+
+    QList<QModelIndex> dirsToAppend;
+
+    // Find the last column that matches the parent's tree
+    int currentColumn = -1;
+    QModelIndex parentIndex = parent;
+    while (currentColumn == -1 && parentIndex.isValid()) {
+        if (columns.isEmpty())
+            break;
+        parentIndex = parentIndex.parent();
+        if (root == parentIndex)
+            passThroughRoot = true;
+        if (!parentIndex.isValid())
+            break;
+        for (int i = columns.size() - 1; i >= 0; --i) {
+            if (columns.at(i)->rootIndex() == parentIndex) {
+                currentColumn = i;
+                break;
+            }
+        }
+        if (currentColumn == -1)
+            dirsToAppend.append(parentIndex);
+    }
+
+    // Someone wants to go to an index that can be reached without changing
+    // the root index, don't allow them
+    if (!clearAll && !passThroughRoot && currentColumn == -1)
+        return;
+
+    if (currentColumn == -1 && parent.isValid())
+        currentColumn = 0;
+
+    // Optimization so we don't go deleting and then creating the same thing
+    bool alreadyExists = false;
+    if (build && columns.size() > currentColumn + 1) {
+        bool viewingParent = (columns.at(currentColumn + 1)->rootIndex() == parent);
+        bool viewingChild = (!model->hasChildren(parent)
+                             && !columns.at(currentColumn + 1)->rootIndex().isValid());
+        if (viewingParent || viewingChild) {
+            currentColumn++;
+            alreadyExists = true;
+        }
+    }
+
+    // Delete columns that don't match our path
+    for (int i = columns.size() - 1; i > currentColumn; --i) {
+        QAbstractItemView* notShownAnymore = columns.at(i);
+        columns.removeAt(i);
+        notShownAnymore->setVisible(false);
+        if (notShownAnymore != previewColumn)
+            notShownAnymore->deleteLater();
+    }
+
+    if (columns.isEmpty()) {
+        offset = 0;
+        updateScrollbars();
+    }
+
+    // Now fill in missing columns
+    while (!dirsToAppend.isEmpty()) {
+        QAbstractItemView *newView = createColumn(dirsToAppend.takeLast(), true);
+        if (!dirsToAppend.isEmpty())
+            newView->setCurrentIndex(dirsToAppend.last());
+    }
+
+    if (build && !alreadyExists)
+        createColumn(parent, false);
+}
+
+void QColumnViewPrivate::_q_clicked(const QModelIndex &index)
+{
+    Q_Q(QColumnView);
+    QModelIndex parent = index.parent();
+    QAbstractItemView *columnClicked = 0;
+    for (int column = 0; column < columns.count(); ++column) {
+        if (columns.at(column)->rootIndex() == parent) {
+            columnClicked = columns[column];
+            break;
+        }
+    }
+    if (q->selectionModel() && columnClicked) {
+        QItemSelectionModel::SelectionFlags flags = QItemSelectionModel::Current;
+        if (columnClicked->selectionModel()->isSelected(index))
+            flags |= QItemSelectionModel::Select;
+        q->selectionModel()->setCurrentIndex(index, flags);
+    }
+}
+
+/*!
+    \internal
+    Create a new column for \a index.  A grip is attached if requested and it is shown
+    if requested.
+
+    Return the new view
+
+    \sa createColumn() setPreviewWidget()
+    \sa doLayout()
+*/
+QAbstractItemView *QColumnViewPrivate::createColumn(const QModelIndex &index, bool show)
+{
+    Q_Q(QColumnView);
+    QAbstractItemView *view = 0;
+    if (model->hasChildren(index)) {
+        view = q->createColumn(index);
+        q->connect(view, SIGNAL(clicked(const QModelIndex &)),
+                   q, SLOT(_q_clicked(const QModelIndex &)));
+    } else {
+        if (!previewColumn)
+            setPreviewWidget(new QWidget(q));
+        view = previewColumn;
+        view->setMinimumWidth(qMax(view->minimumWidth(), previewWidget->minimumWidth()));
+    }
+
+    q->connect(view, SIGNAL(activated(const QModelIndex &)),
+            q, SIGNAL(activated(const QModelIndex &)));
+    q->connect(view, SIGNAL(clicked(const QModelIndex &)),
+            q, SIGNAL(clicked(const QModelIndex &)));
+    q->connect(view, SIGNAL(doubleClicked(const QModelIndex &)),
+            q, SIGNAL(doubleClicked(const QModelIndex &)));
+    q->connect(view, SIGNAL(entered(const QModelIndex &)),
+            q, SIGNAL(entered(const QModelIndex &)));
+    q->connect(view, SIGNAL(pressed(const QModelIndex &)),
+            q, SIGNAL(pressed(const QModelIndex &)));
+
+    view->setFocusPolicy(Qt::NoFocus);
+    view->setParent(q->viewport());
+    Q_ASSERT(view);
+
+    // Setup corner grip
+    if (showResizeGrips) {
+        QColumnViewGrip *grip = new QColumnViewGrip(view);
+        view->setCornerWidget(grip);
+        q->connect(grip, SIGNAL(gripMoved(int)), q, SLOT(_q_gripMoved(int)));
+    }
+
+    if (columnSizes.count() > columns.count()) {
+        view->setGeometry(0, 0, columnSizes.at(columns.count()), q->viewport()->height());
+    } else {
+        int initialWidth = view->sizeHint().width();
+        if (q->isRightToLeft())
+            view->setGeometry(q->viewport()->width() - initialWidth, 0, initialWidth, q->viewport()->height());
+        else
+            view->setGeometry(0, 0, initialWidth, q->viewport()->height());
+        columnSizes.resize(qMax(columnSizes.count(), columns.count() + 1));
+        columnSizes[columns.count()] = initialWidth;
+    }
+    if (!columns.isEmpty() && columns.last()->isHidden())
+        columns.last()->setVisible(true);
+
+    columns.append(view);
+    doLayout();
+    updateScrollbars();
+    if (show && view->isHidden())
+        view->setVisible(true);
+    return view;
+}
+
+/*!
+    \fn void QColumnView::updatePreviewWidget(const QModelIndex &index)
+
+    This signal is emitted when the preview widget should be updated to
+    provide rich information about \a index
+
+    \sa previewWidget()
+ */
+
+/*!
+    To use a custom widget for the final column when you select
+    an item overload this function and return a widget.
+    \a index is the root index that will be assigned to the view.
+
+    Return the new view.  QColumnView will automatically take ownership of the widget.
+
+    \sa setPreviewWidget()
+ */
+QAbstractItemView *QColumnView::createColumn(const QModelIndex &index)
+{
+    QListView *view = new QListView(viewport());
+
+    initializeColumn(view);
+
+    view->setRootIndex(index);
+    if (model()->canFetchMore(index))
+        model()->fetchMore(index);
+
+    return view;
+}
+
+/*!
+    Copies the behavior and options of the column view and applies them to
+    the \a column such as the iconSize(), textElideMode() and
+    alternatingRowColors(). This can be useful when reimplementing
+    createColumn().
+
+    \since 4.4
+    \sa createColumn()
+ */
+void QColumnView::initializeColumn(QAbstractItemView *column) const
+{
+    Q_D(const QColumnView);
+
+    column->setFrameShape(QFrame::NoFrame);
+    column->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
+    column->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
+    column->setMinimumWidth(100);
+    column->setAttribute(Qt::WA_MacShowFocusRect, false);
+
+#ifndef QT_NO_DRAGANDDROP
+    column->setDragDropMode(dragDropMode());
+    column->setDragDropOverwriteMode(dragDropOverwriteMode());
+    column->setDropIndicatorShown(showDropIndicator());
+#endif
+    column->setAlternatingRowColors(alternatingRowColors());
+    column->setAutoScroll(hasAutoScroll());
+    column->setEditTriggers(editTriggers());
+    column->setHorizontalScrollMode(horizontalScrollMode());
+    column->setIconSize(iconSize());
+    column->setSelectionBehavior(selectionBehavior());
+    column->setSelectionMode(selectionMode());
+    column->setTabKeyNavigation(tabKeyNavigation());
+    column->setTextElideMode(textElideMode());
+    column->setVerticalScrollMode(verticalScrollMode());
+
+    column->setModel(model());
+
+    // Copy the custom delegate per row
+    QMapIterator<int, QPointer<QAbstractItemDelegate> > i(d->rowDelegates);
+    while (i.hasNext()) {
+        i.next();
+        column->setItemDelegateForRow(i.key(), i.value());
+    }
+
+    // set the delegate to be the columnview delegate
+    QAbstractItemDelegate *delegate = column->itemDelegate();
+    column->setItemDelegate(d->itemDelegate);
+    delete delegate;
+}
+
+/*!
+    Returns the preview widget, or 0 if there is none.
+
+    \sa setPreviewWidget(), updatePreviewWidget()
+*/
+QWidget *QColumnView::previewWidget() const
+{
+    Q_D(const QColumnView);
+    return d->previewWidget;
+}
+
+/*!
+    Sets the preview \a widget.
+
+    The \a widget becomes a child of the column view, and will be
+    destroyed when the column area is deleted or when a new widget is
+    set.
+
+    \sa previewWidget(), updatePreviewWidget()
+*/
+void QColumnView::setPreviewWidget(QWidget *widget)
+{
+    Q_D(QColumnView);
+    d->setPreviewWidget(widget);
+}
+
+/*!
+    \internal
+*/
+void QColumnViewPrivate::setPreviewWidget(QWidget *widget)
+{
+    Q_Q(QColumnView);
+    if (previewColumn) {
+        if (!columns.isEmpty() && columns.last() == previewColumn)
+            columns.removeLast();
+        previewColumn->deleteLater();
+    }
+    QColumnViewPreviewColumn *column = new QColumnViewPreviewColumn(q);
+    column->setPreviewWidget(widget);
+    previewColumn = column;
+    previewColumn->hide();
+    previewColumn->setFrameShape(QFrame::NoFrame);
+    previewColumn->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
+    previewColumn->setSelectionMode(QAbstractItemView::NoSelection);
+    previewColumn->setMinimumWidth(qMax(previewColumn->verticalScrollBar()->width(),
+                previewColumn->minimumWidth()));
+    previewWidget = widget;
+    previewWidget->setParent(previewColumn->viewport());
+}
+
+/*!
+    Sets the column widths to the values given in the \a list.  Extra values in the list are
+    kept and used when the columns are created.
+
+    If list contains too few values, only width of the rest of the columns will not be modified.
+
+    \sa columnWidths(), createColumn()
+*/
+void QColumnView::setColumnWidths(const QList<int> &list)
+{
+    Q_D(QColumnView);
+    int i = 0;
+    for (; (i < list.count() && i < d->columns.count()); ++i) {
+        d->columns.at(i)->resize(list.at(i), d->columns.at(i)->height());
+        d->columnSizes[i] = list.at(i);
+    }
+    for (; i < list.count(); ++i)
+        d->columnSizes.append(list.at(i));
+}
+
+/*!
+    Returns a list of the width of all the columns in this view.
+
+    \sa setColumnWidths()
+*/
+QList<int> QColumnView::columnWidths() const
+{
+    Q_D(const QColumnView);
+    QList<int> list;
+    for (int i = 0; i < d->columns.count(); ++i)
+        list.append(d->columnSizes.at(i));
+    return list;
+}
+
+/*!
+    \reimp
+*/
+void QColumnView::currentChanged(const QModelIndex &current, const QModelIndex &previous)
+{
+    Q_D(QColumnView);
+    if (!current.isValid()) {
+        QAbstractItemView::currentChanged(current, previous);
+        return;
+    }
+
+    QModelIndex currentParent = current.parent();
+    // optimize for just moving up/down in a list where the child view doesn't change
+    if (currentParent == previous.parent()
+            && model()->hasChildren(current) && model()->hasChildren(previous)) {
+        for (int i = 0; i < d->columns.size(); ++i) {
+            if (currentParent == d->columns.at(i)->rootIndex()) {
+                if (d->columns.size() > i + 1) {
+                    QAbstractItemView::currentChanged(current, previous);
+                    return;
+                }
+                break;
+            }
+        }
+    }
+
+    // Scrolling to the right we need to have an empty spot
+    bool found = false;
+    if (currentParent == previous) {
+        for (int i = 0; i < d->columns.size(); ++i) {
+            if (currentParent == d->columns.at(i)->rootIndex()) {
+                found = true;
+                if (d->columns.size() < i + 2) {
+                    d->createColumn(current, false);
+                }
+                break;
+            }
+        }
+    }
+    if (!found)
+        d->closeColumns(current, true);
+
+    if (!model()->hasChildren(current))
+        emit updatePreviewWidget(current);
+
+    QAbstractItemView::currentChanged(current, previous);
+}
+
+/*
+    We have change the current column and need to update focus and selection models
+    on the new current column.
+*/
+void QColumnViewPrivate::_q_changeCurrentColumn()
+{
+    Q_Q(QColumnView);
+    if (columns.isEmpty())
+        return;
+
+    QModelIndex current = q->currentIndex();
+    if (!current.isValid())
+        return;
+
+    // We might have scrolled far to the left so we need to close all of the children
+    closeColumns(current, true);
+
+    // Set up the "current" column with focus
+    int currentColumn = qMax(0, columns.size() - 2);
+    QAbstractItemView *parentColumn = columns.at(currentColumn);
+    if (q->hasFocus())
+        parentColumn->setFocus(Qt::OtherFocusReason);
+    q->setFocusProxy(parentColumn);
+
+    // find the column that is our current selection model and give it a new one.
+    for (int i = 0; i < columns.size(); ++i) {
+        if (columns.at(i)->selectionModel() == q->selectionModel()) {
+            QItemSelectionModel *replacementSelectionModel =
+                new QItemSelectionModel(parentColumn->model());
+            replacementSelectionModel->setCurrentIndex(
+                q->selectionModel()->currentIndex(), QItemSelectionModel::Current);
+            replacementSelectionModel->select(
+                q->selectionModel()->selection(), QItemSelectionModel::Select);
+            QAbstractItemView *view = columns.at(i);
+            view->setSelectionModel(replacementSelectionModel);
+            view->setFocusPolicy(Qt::NoFocus);
+            if (columns.size() > i + 1)
+                view->setCurrentIndex(columns.at(i+1)->rootIndex());
+            break;
+        }
+    }
+    parentColumn->selectionModel()->deleteLater();
+    parentColumn->setFocusPolicy(Qt::StrongFocus);
+    parentColumn->setSelectionModel(q->selectionModel());
+    // We want the parent selection to stay highlighted (but dimmed depending upon the color theme)
+    if (currentColumn > 0) {
+        parentColumn = columns.at(currentColumn - 1);
+        if (parentColumn->currentIndex() != current.parent())
+            parentColumn->setCurrentIndex(current.parent());
+    }
+
+    if (columns.last()->isHidden()) {
+        columns.last()->setVisible(true);
+    }
+    if (columns.last()->selectionModel())
+        columns.last()->selectionModel()->clear();
+    updateScrollbars();
+}
+
+/*!
+    \reimp
+*/
+void QColumnView::selectAll()
+{
+    if (!model() || !selectionModel())
+        return;
+
+    QModelIndexList indexList = selectionModel()->selectedIndexes();
+    QModelIndex parent = rootIndex();
+    QItemSelection selection;
+    if (indexList.count() >= 1)
+        parent = indexList.at(0).parent();
+    if (indexList.count() == 1) {
+        parent = indexList.at(0);
+        if (!model()->hasChildren(parent))
+            parent = parent.parent();
+        else
+            selection.append(QItemSelectionRange(parent, parent));
+    }
+
+    QModelIndex tl = model()->index(0, 0, parent);
+    QModelIndex br = model()->index(model()->rowCount(parent) - 1,
+                                    model()->columnCount(parent) - 1,
+                                    parent);
+    selection.append(QItemSelectionRange(tl, br));
+    selectionModel()->select(selection, QItemSelectionModel::ClearAndSelect);
+}
+
+/*
+ * private object implementation
+ */
+QColumnViewPrivate::QColumnViewPrivate()
+:  QAbstractItemViewPrivate()
+,showResizeGrips(true)
+,offset(0)
+,currentAnimation(ANIMATION_DURATION_MSEC)
+,previewWidget(0)
+,previewColumn(0)
+{
+}
+
+QColumnViewPrivate::~QColumnViewPrivate()
+{
+}
+
+/*!
+    \internal
+    Place all of the columns where they belong inside of the viewport, resize as necessary.
+*/
+void QColumnViewPrivate::doLayout()
+{
+    Q_Q(QColumnView);
+    if (!model || columns.isEmpty())
+        return;
+
+    int viewportHeight = q->viewport()->height();
+    int x = columns.at(0)->x();
+
+    if (q->isRightToLeft()) {
+        x = q->viewport()->width() + q->horizontalOffset();
+        for (int i = 0; i < columns.size(); ++i) {
+            QAbstractItemView *view = columns.at(i);
+            x -= view->width();
+            if (x != view->x() || viewportHeight != view->height())
+                view->setGeometry(x, 0, view->width(), viewportHeight);
+        }
+    } else {
+        for (int i = 0; i < columns.size(); ++i) {
+            QAbstractItemView *view = columns.at(i);
+            int currentColumnWidth = view->width();
+            if (x != view->x() || viewportHeight != view->height())
+                view->setGeometry(x, 0, currentColumnWidth, viewportHeight);
+            x += currentColumnWidth;
+        }
+    }
+}
+
+/*!
+    \internal
+
+    Draws a delegate with a > if an object has children.
+
+    \sa {Model/View Programming}, QItemDelegate
+*/
+void QColumnViewDelegate::paint(QPainter *painter,
+                          const QStyleOptionViewItem &option,
+                          const QModelIndex &index) const
+{
+    drawBackground(painter, option, index );
+
+    bool reverse = (option.direction == Qt::RightToLeft);
+    int width = ((option.rect.height() * 2) / 3);
+    // Modify the options to give us room to add an arrow
+    QStyleOptionViewItemV4 opt = option;
+    if (reverse)
+        opt.rect.adjust(width,0,0,0);
+    else
+        opt.rect.adjust(0,0,-width,0);
+
+    if (!(index.model()->flags(index) & Qt::ItemIsEnabled)) {
+        opt.showDecorationSelected = true;
+        opt.state |= QStyle::State_Selected;
+    }
+
+    QItemDelegate::paint(painter, opt, index);
+
+    if (reverse)
+        opt.rect = QRect(option.rect.x(), option.rect.y(), width, option.rect.height());
+    else
+        opt.rect = QRect(option.rect.x() + option.rect.width() - width, option.rect.y(),
+                         width, option.rect.height());
+
+    // Draw >
+    if (index.model()->hasChildren(index)) {
+        const QWidget *view = opt.widget;
+        QStyle *style = view ? view->style() : qApp->style();
+        style->drawPrimitive(QStyle::PE_IndicatorColumnViewArrow, &opt, painter, view);
+    }
+}
+
+QT_END_NAMESPACE
+
+#include "moc_qcolumnview.cpp"
+
+#endif // QT_NO_COLUMNVIEW