qabstractscrollarea_p.h

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#ifndef QABSTRACTSCROLLAREA_P_H
#define QABSTRACTSCROLLAREA_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 <QtWidgets/private/qtwidgetsglobal_p.h>
#include "private/qframe_p.h"
#include "qabstractscrollarea.h"
#include <QtGui/private/qgridlayoutengine_p.h>
 
QT_BEGIN_NAMESPACE
 
#if QT_CONFIG(scrollarea)
 
class QScrollBar;
class QAbstractScrollAreaScrollBarContainer;
 
class Q_AUTOTEST_EXPORT QAbstractScrollAreaPrivate: public QFramePrivate
{
    Q_DECLARE_PUBLIC(QAbstractScrollArea)
 
public:
    QAbstractScrollAreaPrivate();
    ~QAbstractScrollAreaPrivate();
 
    void replaceScrollBar(QScrollBar *scrollBar, Qt::Orientation orientation);
 
    QHVContainer<QAbstractScrollAreaScrollBarContainer *> scrollBarContainers;
    QScrollBar *hbar, *vbar;
    Qt::ScrollBarPolicy vbarpolicy, hbarpolicy;
 
    bool shownOnce;
    bool inResize;
    mutable QSize sizeHint;
    QAbstractScrollArea::SizeAdjustPolicy sizeAdjustPolicy;
 
    QWidget *viewport;
    QWidget *cornerWidget;
    QRect cornerPaintingRect;
 
    int left, top, right, bottom; // viewport margin
 
    int xoffset, yoffset;
    QPoint overshoot;
 
    void init();
    void layoutChildren();
    void layoutChildren_helper(bool *needHorizontalScrollbar, bool *needVerticalScrollbar);
    virtual void scrollBarPolicyChanged(Qt::Orientation, Qt::ScrollBarPolicy) {}
    virtual bool canStartScrollingAt( const QPoint &startPos ) const;
 
    void flashScrollBars();
    void setScrollBarTransient(QScrollBar *scrollBar, bool transient);
 
    void _q_hslide(int);
    void _q_vslide(int);
    void _q_showOrHideScrollBars();
 
    virtual QPoint contentsOffset() const;
 
    inline bool viewportEvent(QEvent *event)
    { return q_func()->viewportEvent(event); }
    QScopedPointer<QObject> viewportFilter;
};
 
class QAbstractScrollAreaFilter : public QObject
{
    Q_OBJECT
public:
    QAbstractScrollAreaFilter(QAbstractScrollAreaPrivate *p) : d(p)
    { setObjectName(QLatin1StringView("qt_abstractscrollarea_filter")); }
    bool eventFilter(QObject *o, QEvent *e) override
    { return (o == d->viewport ? d->viewportEvent(e) : false); }
private:
    QAbstractScrollAreaPrivate *d;
};
 
class QBoxLayout;
class QAbstractScrollAreaScrollBarContainer : public QWidget
{
public:
    enum LogicalPosition { LogicalLeft = 1, LogicalRight = 2 };
 
    QAbstractScrollAreaScrollBarContainer(Qt::Orientation orientation, QWidget *parent);
    void addWidget(QWidget *widget, LogicalPosition position);
    QWidgetList widgets(LogicalPosition position);
    void removeWidget(QWidget *widget);
 
    QScrollBar *scrollBar;
    QBoxLayout *layout;
private:
    int scrollBarLayoutIndex() const;
 
    Qt::Orientation orientation;
};
 
#endif // QT_CONFIG(scrollarea)
 
QT_END_NAMESPACE
 
#endif // QABSTRACTSCROLLAREA_P_H