/****************************************************************************
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** 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
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** file. Please review the following information to ensure the GNU General
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** $QT_END_LICENSE$
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****************************************************************************/

#ifndef QABSTRACTITEMDELEGATE_H
#define QABSTRACTITEMDELEGATE_H

#include <QtCore/qobject.h>
#include <QtWidgets/qstyleoption.h>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE


#ifndef QT_NO_ITEMVIEWS

class QPainter;
class QModelIndex;
class QAbstractItemModel;
class QAbstractItemView;
class QHelpEvent;

class Q_WIDGETS_EXPORT QAbstractItemDelegate : public QObject
{
    Q_OBJECT

public:

    enum EndEditHint {
        NoHint,
        EditNextItem,
        EditPreviousItem,
        SubmitModelCache,
        RevertModelCache
    };

    explicit QAbstractItemDelegate(QObject *parent = 0);
    virtual ~QAbstractItemDelegate();

    // painting
    virtual void paint(QPainter *painter,
                       const QStyleOptionViewItem &option,
                       const QModelIndex &index) const = 0;

    virtual QSize sizeHint(const QStyleOptionViewItem &option,
                           const QModelIndex &index) const = 0;

    // editing
    virtual QWidget *createEditor(QWidget *parent,
                                  const QStyleOptionViewItem &option,
                                  const QModelIndex &index) const;

    virtual void destroyEditor(QWidget *editor, const QModelIndex &index) const;

    virtual void setEditorData(QWidget *editor, const QModelIndex &index) const;

    virtual void setModelData(QWidget *editor,
                              QAbstractItemModel *model,
                              const QModelIndex &index) const;

    virtual void updateEditorGeometry(QWidget *editor,
                                      const QStyleOptionViewItem &option,
                                      const QModelIndex &index) const;

    // for non-widget editors
    virtual bool editorEvent(QEvent *event,
                             QAbstractItemModel *model,
                             const QStyleOptionViewItem &option,
                             const QModelIndex &index);

    static QString elidedText(const QFontMetrics &fontMetrics, int width,
                              Qt::TextElideMode mode, const QString &text);

    virtual bool helpEvent(QHelpEvent *event,
                           QAbstractItemView *view,
                           const QStyleOptionViewItem &option,
                           const QModelIndex &index);

Q_SIGNALS:
    void commitData(QWidget *editor);
    void closeEditor(QWidget *editor, QAbstractItemDelegate::EndEditHint hint = NoHint);
    void sizeHintChanged(const QModelIndex &);

protected:
    QAbstractItemDelegate(QObjectPrivate &, QObject *parent = 0);
private:
    Q_DISABLE_COPY(QAbstractItemDelegate)
};

#endif // QT_NO_ITEMVIEWS

QT_END_NAMESPACE

QT_END_HEADER

#endif // QABSTRACTITEMDELEGATE_H