/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (qt-info@nokia.com)

**

** This file is part of the QtGui module of the Qt Toolkit.

**

** $QT_BEGIN_LICENSE:LGPL$

** No Commercial Usage

** This file contains pre-release code and may not be distributed.

** You may use this file in accordance with the terms and conditions

** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

** Alternatively, this file may be used under the terms of the GNU Lesser

** General Public License version 2.1 as published by the Free Software

** Foundation and appearing in the file LICENSE.LGPL included in the

** packaging of this file.  Please review the following information to

** ensure the GNU Lesser General Public License version 2.1 requirements

** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

**

** In addition, as a special exception, Nokia gives you certain additional

** rights.  These rights are described in the Nokia Qt LGPL Exception

** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

**

** If you have questions regarding the use of this file, please contact

** Nokia at qt-info@nokia.com.

**

**

**

**

**

**

**

**

** $QT_END_LICENSE$

**

****************************************************************************/

#ifndef QABSTRACTITEMVIEW_P_H

#define QABSTRACTITEMVIEW_P_H

//

//  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 "private/qabstractitemmodel_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 "QtGui/qregion.h"

#include "QtCore/qdebug.h"

#include "QtGui/qpainter.h"

#include "QtCore/qbasictimer.h"

#ifndef QT_NO_ITEMVIEWS

QT_BEGIN_NAMESPACE

struct QEditorInfo

{

    QEditorInfo() : isStatic(false)

    {

    }

    QEditorInfo(const QPersistentModelIndex &i, QWidget *e, bool b) : index(i), editor(e), isStatic(b)

    {

    }

    QPersistentModelIndex index;

    QPointer<QWidget> editor;

    bool isStatic; //true when called from setIndexWidget

};

typedef QPair<QRect, QModelIndex> QItemViewPaintPair;

typedef QList<QItemViewPaintPair> QItemViewPaintPairs;

class QEmptyModel : public QAbstractItemModel

{

public:

    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_AUTOTEST_EXPORT QAbstractItemViewPrivate : public QAbstractScrollAreaPrivate

{

    Q_DECLARE_PUBLIC(QAbstractItemView)

public:

    QAbstractItemViewPrivate();

    virtual ~QAbstractItemViewPrivate();

    void init();

    virtual void _q_rowsRemoved(const QModelIndex &parent, int start, int end);

    virtual void _q_columnsAboutToBeRemoved(const QModelIndex &parent, int start, int end);

    virtual void _q_columnsRemoved(const QModelIndex &parent, int start, int end);

    virtual void _q_columnsInserted(const QModelIndex &parent, int start, int end);

    virtual void _q_modelDestroyed();

    virtual 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(int delay = 0);

    void interruptDelayedItemsLayout() const;

    void startAutoScroll()

    {   // ### it would be nice to make this into a style hint one day

        int scrollInterval = (verticalScrollMode == QAbstractItemView::ScrollPerItem) ? 150 : 50;

        autoScrollTimer.start(scrollInterval, q_func());

        autoScrollCount = 0;

    }

    void stopAutoScroll() { autoScrollTimer.stop(); autoScrollCount = 0;}

    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;

    virtual void selectAll(QItemSelectionModel::SelectionFlags command);

    void checkMouseMove(const QPersistentModelIndex &index);

    inline void checkMouseMove(const QPoint &pos) { checkMouseMove(q_func()->indexAt(pos)); }

    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;

        }

    }

#ifndef QT_NO_DRAGANDDROP

    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->dropAction() & 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

#endif

            ) {

            QStyleOption opt;

            opt.init(q_func());

            opt.rect = dropIndicatorRect;

            q_func()->style()->drawPrimitive(QStyle::PE_IndicatorItemViewItemDrop, &opt, painter, q_func());

        }

    }

#endif

    virtual QItemViewPaintPairs draggablePaintPairs(const QModelIndexList &indexes, QRect *r) const;

    inline void releaseEditor(QWidget *editor) const {

        if (editor) {

            QObject::disconnect(editor, SIGNAL(destroyed(QObject*)),

                                q_func(), SLOT(editorDestroyed(QObject*)));

            editor->removeEventFilter(itemDelegate);

            editor->hide();

            editor->deleteLater();

        }

    }

    inline void executePostedLayout() const {

        if (delayedPendingLayout && state != QAbstractItemView::CollapsingState) {

            interruptDelayedItemsLayout();

            const_cast<QAbstractItemView*>(q_func())->doItemsLayout();

        }

    }

    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);

        updateDirtyRegion();

        scrollDelayOffset = QPoint(0, 0);

    }

    inline void scrollContentsBy(int dx, int dy) {

        scrollDirtyRegion(dx, dy);

        viewport->scroll(dx, dy);

    }

    void updateDirtyRegion() {

        updateTimer.stop();

        viewport->update(updateRegion);

        updateRegion = QRegion();

    }

    void clearOrRemove();

    void checkPersistentEditorFocus();

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

    inline QPoint offset() const {

        const Q_Q(QAbstractItemView);

        return QPoint(q->isRightToLeft() ? -q->horizontalOffset()

                      : q->horizontalOffset(), q->verticalOffset());

    }

    QEditorInfo editorForIndex(const QModelIndex &index) const;

    inline bool hasEditor(const QModelIndex &index) const {

        return editorForIndex(index).editor != 0;

    }

    QModelIndex indexForEditor(QWidget *editor) const;

    void addEditor(const QModelIndex &index, QWidget *editor, bool isStatic);

    void removeEditor(QWidget *editor);

    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;

    }

    inline bool isIndexValid(const QModelIndex &index) const {

         return (index.row() >= 0) && (index.column() >= 0) && (index.model() == model);

    }

    inline bool isIndexSelectable(const QModelIndex &index) const {

        return (model->flags(index) & Qt::ItemIsSelectable);

    }

    inline bool isIndexEnabled(const QModelIndex &index) const {

        return (model->flags(index) & Qt::ItemIsEnabled);

    }

    inline bool isIndexDropEnabled(const QModelIndex &index) const {

        return (model->flags(index) & Qt::ItemIsDropEnabled);

    }

    inline bool isIndexDragEnabled(const QModelIndex &index) const {

        return (model->flags(index) & Qt::ItemIsDragEnabled);

    }

    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) && isIndexSelectable(index);

    }

    // 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)

            ++ref;

        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) {

                        ++ref;

                        // optimization, we are only interested in the ref count values 0, 1 or >=2

                        if (ref >= 2) {

                            return ref;

                        }

                    }

            }

        }

        return ref;

    }

    /**

     * return true if the index is registered as a QPersistentModelIndex

     */

    inline bool isPersistent(const QModelIndex &index) const

    {

        return static_cast<QAbstractItemModelPrivate *>(model->d_ptr.data())->persistent.indexes.contains(index);

    }

    QModelIndexList selectedDraggableIndexes() const;

    QStyleOptionViewItemV4 viewOptionsV4() const;

    void doDelayedReset()

    {

        //we delay the reset of the timer because some views (QTableView)

        //with headers can't handle the fact that the model has been destroyed

        //all _q_modelDestroyed slots must have been called

        if (!delayedReset.isActive())

            delayedReset.start(0, q_func());

    }

    QAbstractItemModel *model;

    QPointer<QAbstractItemDelegate> itemDelegate;

    QMap<int, QPointer<QAbstractItemDelegate> > rowDelegates;

    QMap<int, QPointer<QAbstractItemDelegate> > columnDelegates;

    QPointer<QItemSelectionModel> selectionModel;

    QItemSelectionModel::SelectionFlag ctrlDragSelectionFlag;

    QAbstractItemView::SelectionMode selectionMode;

    QAbstractItemView::SelectionBehavior selectionBehavior;

    QList<QEditorInfo> editors;

    QSet<QWidget*> persistent;

    QWidget *currentlyCommittingEditor;

    QPersistentModelIndex enteredIndex;

    QPersistentModelIndex pressedIndex;

    Qt::KeyboardModifiers pressedModifiers;

    QPoint pressedPosition;

    bool pressedAlreadySelected;

    //forces the next mouseMoveEvent to send the viewportEntered signal

    //if the mouse is over the viewport and not over an item

    bool viewportEnteredNeeded;

    QAbstractItemView::State state;

    QAbstractItemView::EditTriggers editTriggers;

    QAbstractItemView::EditTrigger lastTrigger;

    QPersistentModelIndex root;

    QPersistentModelIndex hover;

    bool tabKeyNavigation;

#ifndef QT_NO_DRAGANDDROP

    bool showDropIndicator;

    QRect dropIndicatorRect;

    bool dragEnabled;

    QAbstractItemView::DragDropMode dragDropMode;

    bool overwrite;

    QAbstractItemView::DropIndicatorPosition dropIndicatorPosition;

    Qt::DropAction defaultDropAction;

#endif

#ifdef QT_SOFTKEYS_ENABLED

    QAction *doneSoftKey;

#endif

    QString keyboardInput;

    QTime keyboardInputTime;

    bool autoScroll;

    QBasicTimer autoScrollTimer;

    int autoScrollMargin;

    int autoScrollCount;

    bool shouldScrollToCurrentOnShow; //used to know if we should scroll to current on show event

    bool alternatingColors;

    QSize iconSize;

    Qt::TextElideMode textElideMode;

    QRegion updateRegion; // used for the internal update system

    QPoint scrollDelayOffset;

    QBasicTimer updateTimer;

    QBasicTimer delayedEditing;

    QBasicTimer delayedAutoScroll; //used when an item is clicked

    QBasicTimer delayedReset;

    QAbstractItemView::ScrollMode verticalScrollMode;

    QAbstractItemView::ScrollMode horizontalScrollMode;

    bool currentIndexSet;

    bool wrapItemText;

    mutable bool delayedPendingLayout;

private:

    mutable QBasicTimer delayedLayout;

    mutable QBasicTimer fetchMoreTimer;

};

QT_BEGIN_INCLUDE_NAMESPACE

#include <qvector.h>

QT_END_INCLUDE_NAMESPACE

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;

        else

            start = i;

        i = (start + end + 1) >> 1;

    }

    return i;

}

QT_END_NAMESPACE

#endif // QT_NO_ITEMVIEWS

#endif // QABSTRACTITEMVIEW_P_H