/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtWidgets module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 Digia. For licensing terms and
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** use the contact form at http://qt.digia.com/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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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** $QT_END_LICENSE$
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****************************************************************************/

#ifndef QSPLITTER_H
#define QSPLITTER_H

#include <QtWidgets/qframe.h>
#include <QtWidgets/qsizepolicy.h>

QT_BEGIN_NAMESPACE


#ifndef QT_NO_SPLITTER

class QSplitterPrivate;
class QTextStream;
template <typename T> class QList;

class QSplitterHandle;

class Q_WIDGETS_EXPORT QSplitter : public QFrame
{
    Q_OBJECT

    Q_PROPERTY(Qt::Orientation orientation READ orientation WRITE setOrientation)
    Q_PROPERTY(bool opaqueResize READ opaqueResize WRITE setOpaqueResize)
    Q_PROPERTY(int handleWidth READ handleWidth WRITE setHandleWidth)
    Q_PROPERTY(bool childrenCollapsible READ childrenCollapsible WRITE setChildrenCollapsible)

public:
    explicit QSplitter(QWidget* parent = 0);
    explicit QSplitter(Qt::Orientation, QWidget* parent = 0);
    ~QSplitter();

    void addWidget(QWidget *widget);
    void insertWidget(int index, QWidget *widget);

    void setOrientation(Qt::Orientation);
    Qt::Orientation orientation() const;

    void setChildrenCollapsible(bool);
    bool childrenCollapsible() const;

    void setCollapsible(int index, bool);
    bool isCollapsible(int index) const;
    void setOpaqueResize(bool opaque = true);
    bool opaqueResize() const;
    void refresh();

    QSize sizeHint() const;
    QSize minimumSizeHint() const;

    QList<int> sizes() const;
    void setSizes(const QList<int> &list);

    QByteArray saveState() const;
    bool restoreState(const QByteArray &state);

    int handleWidth() const;
    void setHandleWidth(int);

    int indexOf(QWidget *w) const;
    QWidget *widget(int index) const;
    int count() const;

    void getRange(int index, int *, int *) const;
    QSplitterHandle *handle(int index) const;

    void setStretchFactor(int index, int stretch);

Q_SIGNALS:
    void splitterMoved(int pos, int index);

protected:
    virtual QSplitterHandle *createHandle();

    void childEvent(QChildEvent *);

    bool event(QEvent *);
    void resizeEvent(QResizeEvent *);

    void changeEvent(QEvent *);
    void moveSplitter(int pos, int index);
    void setRubberBand(int position);
    int closestLegalPosition(int, int);


private:
    Q_DISABLE_COPY(QSplitter)
    Q_DECLARE_PRIVATE(QSplitter)
private:
    friend class QSplitterHandle;
};

Q_WIDGETS_EXPORT QTextStream& operator<<(QTextStream&, const QSplitter&);
Q_WIDGETS_EXPORT QTextStream& operator>>(QTextStream&, QSplitter&);

class QSplitterHandlePrivate;
class Q_WIDGETS_EXPORT QSplitterHandle : public QWidget
{
    Q_OBJECT
public:
    explicit QSplitterHandle(Qt::Orientation o, QSplitter *parent);
    ~QSplitterHandle();

    void setOrientation(Qt::Orientation o);
    Qt::Orientation orientation() const;
    bool opaqueResize() const;
    QSplitter *splitter() const;

    QSize sizeHint() const;

protected:
    void paintEvent(QPaintEvent *);
    void mouseMoveEvent(QMouseEvent *);
    void mousePressEvent(QMouseEvent *);
    void mouseReleaseEvent(QMouseEvent *);
    void resizeEvent(QResizeEvent *);
    bool event(QEvent *);

    void moveSplitter(int p);
    int closestLegalPosition(int p);

private:
    Q_DISABLE_COPY(QSplitterHandle)
    Q_DECLARE_PRIVATE(QSplitterHandle)
};

#endif // QT_NO_SPLITTER

QT_END_NAMESPACE

#endif // QSPLITTER_H
