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** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
** This file is part of the QtGui module of the Qt Toolkit.
** This file may be used under the terms of the GNU General Public
** License versions 2.0 or 3.0 as published by the Free Software
** Foundation and appearing in the files LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file.  Alternatively you may (at
** your option) use any later version of the GNU General Public
** License if such license has been publicly approved by Trolltech ASA
** (or its successors, if any) and the KDE Free Qt Foundation. In
** addition, as a special exception, Trolltech gives you certain
** additional rights. These rights are described in the Trolltech GPL
** Exception version 1.1, which can be found at
** http://www.trolltech.com/products/qt/gplexception/ and in the file
** GPL_EXCEPTION.txt in this package.
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
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** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
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** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE


//  W A R N I N G
//  -------------
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
// We mean it.

#include "private/qabstractscrollarea_p.h"
#include "QtGui/qapplication.h"
#include "QtCore/qdatetime.h"
#include "QtGui/qevent.h"
#include "QtGui/qmime.h"
#include "QtGui/qpainter.h"
#include "QtCore/qpair.h"
#include "QtCore/qtimer.h"
#include "QtCore/qtimeline.h"
#include "QtGui/qregion.h"
#include "QtCore/qdebug.h"
#include "QtGui/qpainter.h"


typedef QList<QPair<QPersistentModelIndex, QPointer<QWidget> > > _q_abstractitemview_editor_container;
typedef _q_abstractitemview_editor_container::const_iterator _q_abstractitemview_editor_const_iterator;
typedef _q_abstractitemview_editor_container::iterator _q_abstractitemview_editor_iterator;

class QEmptyModel : public QAbstractItemModel
    explicit QEmptyModel(QObject *parent = 0) : QAbstractItemModel(parent) {}
    QModelIndex index(int, int, const QModelIndex &) const { return QModelIndex(); }
    QModelIndex parent(const QModelIndex &) const { return QModelIndex(); }
    int rowCount(const QModelIndex &) const { return 0; }
    int columnCount(const QModelIndex &) const { return 0; }
    bool hasChildren(const QModelIndex &) const { return false; }
    QVariant data(const QModelIndex &, int) const { return QVariant(); }

class Q_GUI_EXPORT QAbstractItemViewPrivate : public QAbstractScrollAreaPrivate

    virtual ~QAbstractItemViewPrivate();

    void init();

    void _q_rowsRemoved(const QModelIndex &parent, int start, int end);
    void _q_columnsAboutToBeRemoved(const QModelIndex &parent, int start, int end);
    void _q_columnsRemoved(const QModelIndex &parent, int start, int end);
    void _q_modelDestroyed();
    void _q_layoutChanged();

    void fetchMore();
    bool shouldEdit(QAbstractItemView::EditTrigger trigger, const QModelIndex &index) const;
    bool shouldForwardEvent(QAbstractItemView::EditTrigger trigger, const QEvent *event) const;
    bool shouldAutoScroll(const QPoint &pos) const;
    void doDelayedItemsLayout();

    bool dropOn(QDropEvent *event, int *row, int *col, QModelIndex *index);
    bool droppingOnItself(QDropEvent *event, const QModelIndex &index);

    QWidget *editor(const QModelIndex &index, const QStyleOptionViewItem &options);
    bool sendDelegateEvent(const QModelIndex &index, QEvent *event) const;
    bool openEditor(const QModelIndex &index, QEvent *event);
    void updateEditorData(const QModelIndex &topLeft, const QModelIndex &bottomRight);

    QItemSelectionModel::SelectionFlags multiSelectionCommand(const QModelIndex &index,
                                                              const QEvent *event) const;
    QItemSelectionModel::SelectionFlags extendedSelectionCommand(const QModelIndex &index,
                                                                 const QEvent *event) const;
    QItemSelectionModel::SelectionFlags contiguousSelectionCommand(const QModelIndex &index,
                                                                   const QEvent *event) const;
    void selectAll(QItemSelectionModel::SelectionFlags command);

    inline QItemSelectionModel::SelectionFlags selectionBehaviorFlags() const
        switch (selectionBehavior) {
        case QAbstractItemView::SelectRows: return QItemSelectionModel::Rows;
        case QAbstractItemView::SelectColumns: return QItemSelectionModel::Columns;
        case QAbstractItemView::SelectItems: default: return QItemSelectionModel::NoUpdate;

    QAbstractItemView::DropIndicatorPosition position(const QPoint &pos, const QRect &rect, const QModelIndex &idx) const;
    inline bool canDecode(QDropEvent *e) const {
        QStringList modelTypes = model->mimeTypes();
        const QMimeData *mime = e->mimeData();
        for (int i = 0; i < modelTypes.count(); ++i)
            if (mime->hasFormat(modelTypes.at(i))
                && (e->proposedAction() & model->supportedDropActions()))
                return true;
        return false;

    inline void paintDropIndicator(QPainter *painter)
        if (showDropIndicator && state == QAbstractItemView::DraggingState
#ifndef QT_NO_CURSOR
            && viewport->cursor().shape() != Qt::ForbiddenCursor
            if (dropIndicatorRect.height() == 0) // FIXME: should be painted by style
                painter->drawLine(dropIndicatorRect.topLeft(), dropIndicatorRect.topRight());
            else painter->drawRect(dropIndicatorRect);

    inline void releaseEditor(QWidget *editor) const {
        if (editor) {
            QObject::disconnect(editor, SIGNAL(destroyed(QObject*)),
                                q_func(), SLOT(editorDestroyed(QObject*)));

    inline void executePostedLayout() const {
        if (delayedLayout.isActive() && state != QAbstractItemView::CollapsingState) {

    inline void setDirtyRegion(const QRegion &visualRegion) {
        updateRegion += visualRegion;
        if (!updateTimer.isActive())
            updateTimer.start(0, q_func());

    inline void scrollDirtyRegion(int dx, int dy) {
        scrollDelayOffset = QPoint(-dx, -dy);
        scrollDelayOffset = QPoint(0, 0);

    inline void scrollContentsBy(int dx, int dy) {
        scrollDirtyRegion(dx, dy);
        viewport->scroll(dx, dy);

    void updateDirtyRegion() {
        updateRegion = QRegion();

    void clearOrRemove();
    void checkPersistentEditorFocus();

    QPixmap renderToPixmap(const QModelIndexList &indexes, QRect *r = 0) const;

    inline bool isIndexValid(const QModelIndex &index) const {
         return (index.row() >= 0) && (index.column() >= 0) && (index.model() == model);

    virtual bool selectionAllowed(const QModelIndex &index) const {
        // in some views we want to go ahead with selections, even if the index is invalid
        return isIndexValid(index);

    inline QPoint offset() const {
        const Q_Q(QAbstractItemView);
        return QPoint(q->isRightToLeft() ? -q->horizontalOffset()
                      : q->horizontalOffset(), q->verticalOffset());

    QWidget *editorForIndex(const QModelIndex &index) const;
    inline bool hasEditor(const QModelIndex &index) const {
        return editorForIndex(index) != 0;

    QModelIndex indexForEditor(QWidget *editor) const;
    void addEditor(const QModelIndex &index, QWidget *editor);
    void removeEditor(QWidget *editor);

    inline QModelIndex indexForIterator(const _q_abstractitemview_editor_iterator &it) const {
        return (*it).first.operator const QModelIndex&();
    inline QWidget *editorForIterator(const _q_abstractitemview_editor_iterator &it) const {
        return (*it).second;
    inline QModelIndex indexForIterator(const _q_abstractitemview_editor_const_iterator &it) const {
        return (*it).first.operator const QModelIndex&();
    inline QWidget *editorForIterator(const _q_abstractitemview_editor_const_iterator &it) const {
        return (*it).second;

    inline bool isAnimating() const {
        return state == QAbstractItemView::AnimatingState;

    inline QAbstractItemDelegate *delegateForIndex(const QModelIndex &index) const {
      QAbstractItemDelegate *del;
      if ((del = rowDelegates.value(index.row(), 0))) return del;
      if ((del = columnDelegates.value(index.column(), 0))) return del;
      return itemDelegate;

    // reimplemented from QAbstractScrollAreaPrivate
    virtual QPoint contentsOffset() const {
        Q_Q(const QAbstractItemView);
        return QPoint(q->horizontalOffset(), q->verticalOffset());

     * For now, assume that we have few editors, if we need a more efficient implementation 
     * we should add a QMap<QAbstractItemDelegate*, int> member.
    int delegateRefCount(const QAbstractItemDelegate *delegate) const
        int ref = 0;
        if (itemDelegate == delegate)

        for (int maps = 0; maps < 2; ++maps) {
            const QMap<int, QPointer<QAbstractItemDelegate> > *delegates = maps ? &columnDelegates : &rowDelegates;
            for (QMap<int, QPointer<QAbstractItemDelegate> >::const_iterator it = delegates->begin(); 
                it != delegates->end(); ++it) {
                    if (it.value() == delegate) {
                        // optimization, we are only interested in the ref count values 0, 1 or >=2
                        if (ref >= 2) {
                            return ref;
        return ref;

    QStyleOptionViewItemV3 viewOptionsV3() const;

    QAbstractItemModel *model;
    QPointer<QAbstractItemDelegate> itemDelegate;
    QMap<int, QPointer<QAbstractItemDelegate> > rowDelegates;
    QMap<int, QPointer<QAbstractItemDelegate> > columnDelegates;
    QPointer<QItemSelectionModel> selectionModel;

    QAbstractItemView::SelectionMode selectionMode;
    QAbstractItemView::SelectionBehavior selectionBehavior;

    _q_abstractitemview_editor_container editors;
    QList<QWidget*> persistent;
    QWidget *currentlyCommittingEditor;

    QPersistentModelIndex enteredIndex;
    QPersistentModelIndex pressedIndex;
    Qt::KeyboardModifiers pressedModifiers;
    QPoint pressedPosition;
    bool pressedAlreadySelected;

    QAbstractItemView::State state;
    QAbstractItemView::EditTriggers editTriggers;
    QAbstractItemView::EditTrigger lastTrigger;

    QPersistentModelIndex root;
    QPersistentModelIndex hover;

    bool tabKeyNavigation;

    bool showDropIndicator;
    QRect dropIndicatorRect;
    bool dragEnabled;
    QAbstractItemView::DragDropMode dragDropMode;
    bool overwrite;
    QAbstractItemView::DropIndicatorPosition dropIndicatorPosition;

    QString keyboardInput;
    QTime keyboardInputTime;

    bool autoScroll;
    QBasicTimer autoScrollTimer;
    int autoScrollMargin;
    int autoScrollCount;

    bool alternatingColors;

    QSize iconSize;
    Qt::TextElideMode textElideMode;

    QRegion updateRegion; // used for the internal update system
    QPoint scrollDelayOffset;

    QBasicTimer updateTimer;
    QBasicTimer delayedEditing;
    mutable QBasicTimer delayedLayout;
    QBasicTimer delayedAutoScroll; //used when an item is clicked
    QTimeLine timeline;

    QAbstractItemView::ScrollMode verticalScrollMode;
    QAbstractItemView::ScrollMode horizontalScrollMode;

    bool currentIndexSet;

    bool wrapItemText;

#include <qvector.h>

template <typename T>
inline int qBinarySearch(const QVector<T> &vec, const T &item, int start, int end)
    int i = (start + end + 1) >> 1;
    while (end - start > 0) {
        if (vec.at(i) > item)
            end = i - 1;
            start = i;
        i = (start + end + 1) >> 1;
    return i;



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