1 /**************************************************************************** 2 ** 3 ** Copyright (C) 2016 The Qt Company Ltd. 4 ** Contact: https://www.qt.io/licensing/ 5 ** 6 ** This file is part of the Qt Quick Layouts module of the Qt Toolkit. 7 ** 8 ** $QT_BEGIN_LICENSE:LGPL$ 9 ** Commercial License Usage 10 ** Licensees holding valid commercial Qt licenses may use this file in 11 ** accordance with the commercial license agreement provided with the 12 ** Software or, alternatively, in accordance with the terms contained in 13 ** a written agreement between you and The Qt Company. For licensing terms 14 ** and conditions see https://www.qt.io/terms-conditions. For further 15 ** information use the contact form at https://www.qt.io/contact-us. 16 ** 17 ** GNU Lesser General Public License Usage 18 ** Alternatively, this file may be used under the terms of the GNU Lesser 19 ** General Public License version 3 as published by the Free Software 20 ** Foundation and appearing in the file LICENSE.LGPL3 included in the 21 ** packaging of this file. Please review the following information to 22 ** ensure the GNU Lesser General Public License version 3 requirements 23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. 24 ** 25 ** GNU General Public License Usage 26 ** Alternatively, this file may be used under the terms of the GNU 27 ** General Public License version 2.0 or (at your option) the GNU General 28 ** Public license version 3 or any later version approved by the KDE Free 29 ** Qt Foundation. The licenses are as published by the Free Software 30 ** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 31 ** included in the packaging of this file. Please review the following 32 ** information to ensure the GNU General Public License requirements will 33 ** be met: https://www.gnu.org/licenses/gpl-2.0.html and 34 ** https://www.gnu.org/licenses/gpl-3.0.html. 35 ** 36 ** $QT_END_LICENSE$ 37 ** 38 ****************************************************************************/ 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" 61 QT_BEGIN_NAMESPACE 62 63 class QQuickGridLayoutItem : public QGridLayoutItem { 64 public: 65 QQuickGridLayoutItem(QQuickItem *item, int row, int column, 66 int rowSpan = 1, int columnSpan = 1, Qt::Alignment alignment = { }) QGridLayoutItem(row,column,rowSpan,columnSpan,alignment)67 : QGridLayoutItem(row, column, rowSpan, columnSpan, alignment), m_item(item), sizeHintCacheDirty(true), useFallbackToWidthOrHeight(true) {} 68 69 sizeHint(Qt::SizeHint which,const QSizeF & constraint)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 effectiveSizeHints()76 QSizeF *effectiveSizeHints() const 77 { 78 if (!sizeHintCacheDirty) 79 return cachedSizeHints; 80 81 QQuickLayout::effectiveSizeHints_helper(m_item, cachedSizeHints, 0, useFallbackToWidthOrHeight); 82 useFallbackToWidthOrHeight = false; 83 84 sizeHintCacheDirty = false; 85 return cachedSizeHints; 86 } 87 setCachedSizeHints(QSizeF * sizeHints)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 invalidate()96 void invalidate() 97 { 98 qCDebug(lcQuickLayouts) << "QQuickGridLayoutItem::invalidate()"; 99 sizeHintCacheDirty = true; 100 } 101 sizePolicy(Qt::Orientation orientation)102 QLayoutPolicy::Policy sizePolicy(Qt::Orientation orientation) const override 103 { 104 return QQuickLayout::effectiveSizePolicy_helper(m_item, orientation, attachedLayoutObject(m_item, false)); 105 } 106 setGeometry(const QRectF & rect)107 void setGeometry(const QRectF &rect) override 108 { 109 QQuickLayoutAttached *info = attachedLayoutObject(m_item, false); 110 const QRectF r = info ? rect.marginsRemoved(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 *>(m_item)) { 117 if (lay->invalidatedArrangement()) 118 lay->rearrange(newSize); 119 } 120 } else { 121 m_item->setSize(newSize); 122 } 123 } 124 layoutItem()125 QQuickItem *layoutItem() const { return m_item; } 126 127 QQuickItem *m_item; 128 private: 129 mutable QSizeF cachedSizeHints[Qt::NSizeHints]; 130 mutable unsigned sizeHintCacheDirty : 1; 131 mutable unsigned useFallbackToWidthOrHeight : 1; 132 }; 133 134 class QQuickGridLayoutEngine : public QGridLayoutEngine { 135 public: QQuickGridLayoutEngine()136 QQuickGridLayoutEngine() : QGridLayoutEngine(Qt::AlignVCenter, true /*snapToPixelGrid*/) { } 137 indexOf(QQuickItem * item)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 findLayoutItem(QQuickItem * layoutItem)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 }; 160 161 162 163 QT_END_NAMESPACE 164 165 #endif // QQUICKGRIDLAYOUTENGINE_P_H 166