1// Copyright (C) 2016 The Qt Company Ltd.
2// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
3
4#ifndef QQUICKSTACKLAYOUT_H
5#define QQUICKSTACKLAYOUT_H
6
7//
8// W A R N I N G
9// -------------
10//
11// This file is not part of the Qt API. It exists purely as an
12// implementation detail. This header file may change from version to
13// version without notice, or even be removed.
14//
15// We mean it.
16//
17
18#include <QtQuickLayouts/private/qquicklayoutglobal_p.h>
19#include <QtQuickLayouts/private/qquicklayout_p.h>
20
21QT_BEGIN_NAMESPACE
22
23class QQuickStackLayoutPrivate;
24class QQuickStackLayoutAttached;
25
26class Q_QUICKLAYOUTS_PRIVATE_EXPORT QQuickStackLayout : public QQuickLayout
27{
28 Q_OBJECT
29 Q_PROPERTY(int count READ count NOTIFY countChanged FINAL)
30 Q_PROPERTY(int currentIndex READ currentIndex WRITE setCurrentIndex NOTIFY currentIndexChanged FINAL)
31 QML_NAMED_ELEMENT(StackLayout)
32 QML_ADDED_IN_VERSION(1, 3)
33 QML_ATTACHED(QQuickStackLayoutAttached)
34
35public:
36 explicit QQuickStackLayout(QQuickItem *parent = nullptr);
37 int count() const;
38 int currentIndex() const;
39 void setCurrentIndex(int index);
40
41 void componentComplete() override;
42 void itemChange(ItemChange change, const ItemChangeData &value) override;
43 QSizeF sizeHint(Qt::SizeHint whichSizeHint) const override;
44 void setAlignment(QQuickItem *item, Qt::Alignment align) override;
45 void invalidate(QQuickItem *childItem = nullptr) override;
46 void updateLayoutItems() override { }
47 void rearrange(const QSizeF &) override;
48 void setStretchFactor(QQuickItem *item, int stretchFactor, Qt::Orientation orient) override;
49
50 // iterator
51 Q_INVOKABLE QQuickItem *itemAt(int index) const override;
52 int itemCount() const override;
53 int indexOf(QQuickItem *item) const;
54
55 /* QQuickItemChangeListener */
56 void itemSiblingOrderChanged(QQuickItem *item) override;
57
58 static QQuickStackLayoutAttached *qmlAttachedProperties(QObject *object);
59
60Q_SIGNALS:
61 void currentIndexChanged();
62 void countChanged();
63
64private:
65 enum AdjustCurrentIndexPolicy {
66 DontAdjustCurrentIndex,
67 AdjustCurrentIndex
68 };
69
70 static void collectItemSizeHints(QQuickItem *item, QSizeF *sizeHints);
71 bool shouldIgnoreItem(QQuickItem *item) const;
72 void childItemsChanged(AdjustCurrentIndexPolicy adjustCurrentIndexPolicy = DontAdjustCurrentIndex);
73 Q_DECLARE_PRIVATE(QQuickStackLayout)
74
75 friend class QQuickStackLayoutAttached;
76
77 QList<QQuickItem*> m_items;
78
79 struct SizeHints {
80 inline QSizeF &min() { return array[Qt::MinimumSize]; }
81 inline QSizeF &pref() { return array[Qt::PreferredSize]; }
82 inline QSizeF &max() { return array[Qt::MaximumSize]; }
83 QSizeF array[Qt::NSizeHints];
84 };
85
86 mutable QHash<QQuickItem*, SizeHints> m_cachedItemSizeHints;
87 mutable QSizeF m_cachedSizeHints[Qt::NSizeHints];
88 SizeHints &cachedItemSizeHints(int index) const;
89};
90
91class QQuickStackLayoutPrivate : public QQuickLayoutPrivate
92{
93 Q_DECLARE_PUBLIC(QQuickStackLayout)
94public:
95 QQuickStackLayoutPrivate() : count(0), currentIndex(-1), explicitCurrentIndex(false) {}
96private:
97 int count;
98 int currentIndex;
99 bool explicitCurrentIndex;
100};
101
102class Q_QUICKLAYOUTS_PRIVATE_EXPORT QQuickStackLayoutAttached : public QObject
103{
104 Q_OBJECT
105 Q_PROPERTY(int index READ index NOTIFY indexChanged FINAL)
106 Q_PROPERTY(bool isCurrentItem READ isCurrentItem NOTIFY isCurrentItemChanged FINAL)
107 Q_PROPERTY(QQuickStackLayout *layout READ layout NOTIFY layoutChanged FINAL)
108
109public:
110 QQuickStackLayoutAttached(QObject *object);
111
112 int index() const;
113 void setIndex(int index);
114
115 bool isCurrentItem() const;
116 void setIsCurrentItem(bool isCurrentItem);
117
118 QQuickStackLayout *layout() const;
119 void setLayout(QQuickStackLayout *layout);
120
121Q_SIGNALS:
122 void indexChanged();
123 void isCurrentItemChanged();
124 void layoutChanged();
125
126private:
127 int m_index = -1;
128 bool m_isCurrentItem = false;
129 QQuickStackLayout *m_layout = nullptr;
130};
131
132QT_END_NAMESPACE
133
134#endif // QQUICKSTACKLAYOUT_H
135

source code of qtdeclarative/src/quicklayouts/qquickstacklayout_p.h