summaryrefslogtreecommitdiffstats
path: root/src/widgets/widgets/qabstractscrollarea_p.h
blob: 5cba21c97c08a206c3d77ab9200d46e80cdd5ef0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
/****************************************************************************
**
** 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_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"

QT_BEGIN_NAMESPACE

#if QT_CONFIG(scrollarea)

class QScrollBar;
class QAbstractScrollAreaScrollBarContainer;

// ### Qt 6: is the export still needed? If not, unexport QFramePrivate, too.
class Q_WIDGETS_EXPORT QAbstractScrollAreaPrivate: public QFramePrivate
{
    Q_DECLARE_PUBLIC(QAbstractScrollArea)

public:
    QAbstractScrollAreaPrivate();
    ~QAbstractScrollAreaPrivate();

    void replaceScrollBar(QScrollBar *scrollBar, Qt::Orientation orientation);

    QAbstractScrollAreaScrollBarContainer *scrollBarContainers[Qt::Vertical + 1];
    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(QLatin1String("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