/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWidgets module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QABSTRACTSCROLLAREA_H
#define QABSTRACTSCROLLAREA_H

#include <QtWidgets/qframe.h>

QT_BEGIN_NAMESPACE


#ifndef QT_NO_SCROLLAREA

class QMargins;
class QScrollBar;
class QAbstractScrollAreaPrivate;

class Q_WIDGETS_EXPORT QAbstractScrollArea : public QFrame
{
    Q_OBJECT

    Q_PROPERTY(Qt::ScrollBarPolicy verticalScrollBarPolicy READ verticalScrollBarPolicy WRITE setVerticalScrollBarPolicy)
    Q_PROPERTY(Qt::ScrollBarPolicy horizontalScrollBarPolicy READ horizontalScrollBarPolicy WRITE setHorizontalScrollBarPolicy)
    Q_PROPERTY(SizeAdjustPolicy sizeAdjustPolicy READ sizeAdjustPolicy WRITE setSizeAdjustPolicy)

public:
    explicit QAbstractScrollArea(QWidget *parent = Q_NULLPTR);
    ~QAbstractScrollArea();

    enum SizeAdjustPolicy {
        AdjustIgnored,
        AdjustToContentsOnFirstShow,
        AdjustToContents
    };
    Q_ENUM(SizeAdjustPolicy)

    Qt::ScrollBarPolicy verticalScrollBarPolicy() const;
    void setVerticalScrollBarPolicy(Qt::ScrollBarPolicy);
    QScrollBar *verticalScrollBar() const;
    void setVerticalScrollBar(QScrollBar *scrollbar);

    Qt::ScrollBarPolicy horizontalScrollBarPolicy() const;
    void setHorizontalScrollBarPolicy(Qt::ScrollBarPolicy);
    QScrollBar *horizontalScrollBar() const;
    void setHorizontalScrollBar(QScrollBar *scrollbar);

    QWidget *cornerWidget() const;
    void setCornerWidget(QWidget *widget);

    void addScrollBarWidget(QWidget *widget, Qt::Alignment alignment);
    QWidgetList scrollBarWidgets(Qt::Alignment alignment);

    QWidget *viewport() const;
    void setViewport(QWidget *widget);
    QSize maximumViewportSize() const;

    QSize minimumSizeHint() const Q_DECL_OVERRIDE;

    QSize sizeHint() const Q_DECL_OVERRIDE;

    virtual void setupViewport(QWidget *viewport);

    SizeAdjustPolicy sizeAdjustPolicy() const;
    void setSizeAdjustPolicy(SizeAdjustPolicy policy);

protected:
    QAbstractScrollArea(QAbstractScrollAreaPrivate &dd, QWidget *parent = Q_NULLPTR);
    void setViewportMargins(int left, int top, int right, int bottom);
    void setViewportMargins(const QMargins &margins);
    QMargins viewportMargins() const;

    bool eventFilter(QObject *, QEvent *) Q_DECL_OVERRIDE;
    bool event(QEvent *) Q_DECL_OVERRIDE;
    virtual bool viewportEvent(QEvent *);

    void resizeEvent(QResizeEvent *) Q_DECL_OVERRIDE;
    void paintEvent(QPaintEvent *) Q_DECL_OVERRIDE;
    void mousePressEvent(QMouseEvent *) Q_DECL_OVERRIDE;
    void mouseReleaseEvent(QMouseEvent *) Q_DECL_OVERRIDE;
    void mouseDoubleClickEvent(QMouseEvent *) Q_DECL_OVERRIDE;
    void mouseMoveEvent(QMouseEvent *) Q_DECL_OVERRIDE;
#ifndef QT_NO_WHEELEVENT
    void wheelEvent(QWheelEvent *) Q_DECL_OVERRIDE;
#endif
#ifndef QT_NO_CONTEXTMENU
    void contextMenuEvent(QContextMenuEvent *) Q_DECL_OVERRIDE;
#endif
#ifndef QT_NO_DRAGANDDROP
    void dragEnterEvent(QDragEnterEvent *) Q_DECL_OVERRIDE;
    void dragMoveEvent(QDragMoveEvent *) Q_DECL_OVERRIDE;
    void dragLeaveEvent(QDragLeaveEvent *) Q_DECL_OVERRIDE;
    void dropEvent(QDropEvent *) Q_DECL_OVERRIDE;
#endif

    void keyPressEvent(QKeyEvent *) Q_DECL_OVERRIDE;

    virtual void scrollContentsBy(int dx, int dy);

    virtual QSize viewportSizeHint() const;

private:
    Q_DECLARE_PRIVATE(QAbstractScrollArea)
    Q_DISABLE_COPY(QAbstractScrollArea)
    Q_PRIVATE_SLOT(d_func(), void _q_hslide(int))
    Q_PRIVATE_SLOT(d_func(), void _q_vslide(int))
    Q_PRIVATE_SLOT(d_func(), void _q_showOrHideScrollBars())

    friend class QStyleSheetStyle;
    friend class QWidgetPrivate;
};

#endif // QT_NO_SCROLLAREA

QT_END_NAMESPACE

#endif // QABSTRACTSCROLLAREA_H
