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39
40#ifndef QQUICKGRIDLAYOUTENGINE_P_H
41#define QQUICKGRIDLAYOUTENGINE_P_H
42
43//
44// W A R N I N G
45// -------------
46//
47// This file is not part of the Qt API. It exists for the convenience
48// of the graphics view layout classes. This header
49// file may change from version to version without notice, or even be removed.
50//
51// We mean it.
52//
53
54#include <QtGui/private/qgridlayoutengine_p.h>
55#include <QtGui/private/qlayoutpolicy_p.h>
56#include <QtCore/qmath.h>
57
58#include "qquickitem.h"
59#include "qquicklayout_p.h"
60#include "qdebug.h"
61QT_BEGIN_NAMESPACE
62
63class QQuickGridLayoutItem : public QGridLayoutItem {
64public:
65 QQuickGridLayoutItem(QQuickItem *item, int row, int column,
66 int rowSpan = 1, int columnSpan = 1, Qt::Alignment alignment = { })
67 : QGridLayoutItem(row, column, rowSpan, columnSpan, alignment), m_item(item), sizeHintCacheDirty(true), useFallbackToWidthOrHeight(true) {}
68
69
70 QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint) const override
71 {
72 Q_UNUSED(constraint); // Quick Layouts does not support constraint atm
73 return effectiveSizeHints()[which];
74 }
75
76 QSizeF *effectiveSizeHints() const
77 {
78 if (!sizeHintCacheDirty)
79 return cachedSizeHints;
80
81 QQuickLayout::effectiveSizeHints_helper(item: m_item, cachedSizeHints, info: 0, useFallbackToWidthOrHeight);
82 useFallbackToWidthOrHeight = false;
83
84 sizeHintCacheDirty = false;
85 return cachedSizeHints;
86 }
87
88 void setCachedSizeHints(QSizeF *sizeHints)
89 {
90 for (int i = 0; i < Qt::NSizeHints; ++i) {
91 cachedSizeHints[i] = sizeHints[i];
92 }
93 sizeHintCacheDirty = false;
94 }
95
96 void invalidate()
97 {
98 qCDebug(lcQuickLayouts) << "QQuickGridLayoutItem::invalidate()";
99 sizeHintCacheDirty = true;
100 }
101
102 QLayoutPolicy::Policy sizePolicy(Qt::Orientation orientation) const override
103 {
104 return QQuickLayout::effectiveSizePolicy_helper(item: m_item, orientation, info: attachedLayoutObject(item: m_item, create: false));
105 }
106
107 void setGeometry(const QRectF &rect) override
108 {
109 QQuickLayoutAttached *info = attachedLayoutObject(item: m_item, create: false);
110 const QRectF r = info ? rect.marginsRemoved(margins: info->effectiveQMargins()) : rect;
111 const QSizeF oldSize(m_item->width(), m_item->height());
112 const QSizeF newSize = r.size();
113 m_item->setPosition(r.topLeft());
114 if (newSize == oldSize) {
115 // We need to enforce a rearrange when the geometry is the same
116 if (QQuickLayout *lay = qobject_cast<QQuickLayout *>(object: m_item)) {
117 if (lay->invalidatedArrangement())
118 lay->rearrange(newSize);
119 }
120 } else {
121 m_item->setSize(newSize);
122 }
123 }
124
125 QQuickItem *layoutItem() const { return m_item; }
126
127 QQuickItem *m_item;
128private:
129 mutable QSizeF cachedSizeHints[Qt::NSizeHints];
130 mutable unsigned sizeHintCacheDirty : 1;
131 mutable unsigned useFallbackToWidthOrHeight : 1;
132};
133
134class QQuickGridLayoutEngine : public QGridLayoutEngine {
135public:
136 QQuickGridLayoutEngine() : QGridLayoutEngine(Qt::AlignVCenter, true /*snapToPixelGrid*/) { }
137
138 int indexOf(QQuickItem *item) const {
139 for (int i = 0; i < q_items.size(); ++i) {
140 if (item == static_cast<QQuickGridLayoutItem*>(q_items.at(i))->layoutItem())
141 return i;
142 }
143 return -1;
144 }
145
146 QQuickGridLayoutItem *findLayoutItem(QQuickItem *layoutItem) const
147 {
148 for (int i = q_items.count() - 1; i >= 0; --i) {
149 QQuickGridLayoutItem *item = static_cast<QQuickGridLayoutItem*>(q_items.at(i));
150 if (item->layoutItem() == layoutItem)
151 return item;
152 }
153 return 0;
154 }
155
156 void setAlignment(QQuickItem *quickItem, Qt::Alignment alignment);
157 Qt::Alignment alignment(QQuickItem *quickItem) const;
158
159};
160
161
162
163QT_END_NAMESPACE
164
165#endif // QQUICKGRIDLAYOUTENGINE_P_H
166

source code of qtdeclarative/src/imports/layouts/qquickgridlayoutengine_p.h