89 lines
2.6 KiB
C++
89 lines
2.6 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:GPL-EXCEPT$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 as published by the Free Software
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** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#ifndef ABSTRACTSCROLLAREA_H
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#define ABSTRACTSCROLLAREA_H
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#include "gvbwidget.h"
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class ScrollBar;
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class QGraphicsGridLayout;
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class AbstractScrollArea : public GvbWidget
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{
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Q_OBJECT
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public:
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AbstractScrollArea(QGraphicsWidget *parent = 0);
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~AbstractScrollArea();
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public:
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void setHorizontalScrollBarPolicy(Qt::ScrollBarPolicy policy);
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void setVerticalScrollBarPolicy(Qt::ScrollBarPolicy policy);
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Qt::ScrollBarPolicy verticalScrollBarPolicy() const;
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Qt::ScrollBarPolicy horizontalScrollBarPolicy() const;
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QGraphicsWidget *viewport() const;
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void setViewport(QGraphicsWidget *viewport);
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ScrollBar *verticalScrollBar() const;
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ScrollBar *horizontalScrollBar() const;
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signals:
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void viewportChanged(QGraphicsWidget *viewport);
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protected:
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virtual bool event(QEvent *e);
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virtual void scrollContentsBy(qreal dx, qreal dy);
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private slots:
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void verticalScrollStart();
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void verticalScroll(qreal);
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void horizontalScrollStart();
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void horizontalScroll(qreal);
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private:
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void adjustScrollBars();
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QGraphicsWidget *m_viewport;
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ScrollBar *m_horizontalScrollBar;
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ScrollBar *m_verticalScrollBar;
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Qt::ScrollBarPolicy m_verticalScrollBarPolicy;
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Qt::ScrollBarPolicy m_horizontalScrollBarPolicy;
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qreal m_prevHorizontalValue;
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qreal m_prevVerticalValue;
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};
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#endif // ABSTRACTSCROLLAREA_H
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