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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the Qt Quick Layouts module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QQUICKGRIDLAYOUTENGINE_P_H
#define QQUICKGRIDLAYOUTENGINE_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of the graphics view layout classes. This header
// file may change from version to version without notice, or even be removed.
//
// We mean it.
//
#include <QtGui/private/qgridlayoutengine_p.h>
#include <QtGui/private/qlayoutpolicy_p.h>
#include <QtCore/qmath.h>
#include "qquickitem.h"
#include "qquicklayout_p.h"
#include "qdebug.h"
QT_BEGIN_NAMESPACE
class QQuickGridLayoutItem : public QGridLayoutItem {
public:
QQuickGridLayoutItem(QQuickItem *item, int row, int column,
int rowSpan = 1, int columnSpan = 1, Qt::Alignment alignment = 0)
: QGridLayoutItem(row, column, rowSpan, columnSpan, alignment), m_item(item), sizeHintCacheDirty(true), useFallbackToWidthOrHeight(true) {}
typedef qreal (QQuickLayoutAttached::*SizeGetter)() const;
QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint) const
{
Q_UNUSED(constraint); // Quick Layouts does not support constraint atm
return effectiveSizeHints()[which];
}
static void effectiveSizeHints_helper(QQuickItem *item, QSizeF *cachedSizeHints, QQuickLayoutAttached **info, bool useFallbackToWidthOrHeight);
static QLayoutPolicy::Policy effectiveSizePolicy_helper(QQuickItem *item, Qt::Orientation orientation, QQuickLayoutAttached *info);
QSizeF *effectiveSizeHints() const
{
if (!sizeHintCacheDirty)
return cachedSizeHints;
effectiveSizeHints_helper(m_item, cachedSizeHints, 0, useFallbackToWidthOrHeight);
useFallbackToWidthOrHeight = false;
sizeHintCacheDirty = false;
return cachedSizeHints;
}
void setCachedSizeHints(QSizeF *sizeHints)
{
for (int i = 0; i < Qt::NSizeHints; ++i) {
cachedSizeHints[i] = sizeHints[i];
}
sizeHintCacheDirty = false;
}
void invalidate()
{
quickLayoutDebug() << "engine::invalidate()";
sizeHintCacheDirty = true;
}
QLayoutPolicy::Policy sizePolicy(Qt::Orientation orientation) const
{
return effectiveSizePolicy_helper(m_item, orientation, attachedLayoutObject(m_item, false));
}
void setGeometry(const QRectF &rect)
{
const QSizeF oldSize(m_item->width(), m_item->height());
const QSizeF newSize = rect.size();
const QPointF topLeft(qCeil(rect.x()), qCeil(rect.y()));
m_item->setPosition(topLeft);
if (newSize == oldSize) {
if (QQuickLayout *lay = qobject_cast<QQuickLayout *>(m_item)) {
if (lay->arrangementIsDirty())
lay->rearrange(newSize);
}
} else {
m_item->setSize(newSize);
}
}
QQuickItem *layoutItem() const { return m_item; }
QQuickItem *m_item;
private:
mutable QSizeF cachedSizeHints[Qt::NSizeHints];
mutable unsigned sizeHintCacheDirty : 1;
mutable unsigned useFallbackToWidthOrHeight : 1;
};
class QQuickGridLayoutEngine : public QGridLayoutEngine {
public:
QQuickGridLayoutEngine() : QGridLayoutEngine(Qt::AlignVCenter) { }
int indexOf(QQuickItem *item) const {
for (int i = 0; i < q_items.size(); ++i) {
if (item == static_cast<QQuickGridLayoutItem*>(q_items.at(i))->layoutItem())
return i;
}
return -1;
}
QQuickGridLayoutItem *findLayoutItem(QQuickItem *layoutItem) const
{
for (int i = q_items.count() - 1; i >= 0; --i) {
QQuickGridLayoutItem *item = static_cast<QQuickGridLayoutItem*>(q_items.at(i));
if (item->layoutItem() == layoutItem)
return item;
}
return 0;
}
void setAlignment(QQuickItem *quickItem, Qt::Alignment alignment);
Qt::Alignment alignment(QQuickItem *quickItem) const;
};
QT_END_NAMESPACE
#endif // QQUICKGRIDLAYOUTENGINE_P_H
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