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path: root/src/widgets/graphicsview/qgraphicsgridlayoutengine.cpp
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/****************************************************************************
**
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qgraphicsgridlayoutengine_p.h"

#include "qgraphicslayoutitem_p.h"
#include "qgraphicslayout_p.h"
#include "qgraphicswidget.h"
#include <private/qgraphicswidget_p.h>

QT_BEGIN_NAMESPACE

bool QGraphicsGridLayoutEngineItem::isHidden() const
{
    if (QGraphicsItem *item = q_layoutItem->graphicsItem())
        return QGraphicsItemPrivate::get(item)->explicitlyHidden;
    return false;
}

/*!
  \internal

  If this returns true, the layout will arrange just as if the item was never added to the layout.
  (Note that this shouldn't lead to a "double spacing" where the item was hidden)
  ### Qt6: Move to QGraphicsLayoutItem and make virtual
*/
bool QGraphicsGridLayoutEngineItem::isIgnored() const
{
    return isHidden() && !q_layoutItem->sizePolicy().retainSizeWhenHidden();
}

/*
  returns \c true if the size policy returns \c true for either hasHeightForWidth()
  or hasWidthForHeight()
 */
bool QGraphicsGridLayoutEngineItem::hasDynamicConstraint() const
{
    return QGraphicsLayoutItemPrivate::get(q_layoutItem)->hasHeightForWidth()
        || QGraphicsLayoutItemPrivate::get(q_layoutItem)->hasWidthForHeight();
}

Qt::Orientation QGraphicsGridLayoutEngineItem::dynamicConstraintOrientation() const
{
    if (QGraphicsLayoutItemPrivate::get(q_layoutItem)->hasHeightForWidth())
        return Qt::Vertical;
    else //if (QGraphicsLayoutItemPrivate::get(q_layoutItem)->hasWidthForHeight())
        return Qt::Horizontal;
}


void QGraphicsGridLayoutEngine::setAlignment(QGraphicsLayoutItem *graphicsLayoutItem, Qt::Alignment alignment)
{
    if (QGraphicsGridLayoutEngineItem *gridEngineItem = findLayoutItem(graphicsLayoutItem)) {
        gridEngineItem->setAlignment(alignment);
        invalidate();
    }
}

Qt::Alignment QGraphicsGridLayoutEngine::alignment(QGraphicsLayoutItem *graphicsLayoutItem) const
{
    if (QGraphicsGridLayoutEngineItem *gridEngineItem = findLayoutItem(graphicsLayoutItem))
        return gridEngineItem->alignment();
    return 0;
}


void QGraphicsGridLayoutEngine::setStretchFactor(QGraphicsLayoutItem *layoutItem, int stretch,
                                         Qt::Orientation orientation)
{
    Q_ASSERT(stretch >= 0);

    if (QGraphicsGridLayoutEngineItem *item = findLayoutItem(layoutItem))
        item->setStretchFactor(stretch, orientation);
}

int QGraphicsGridLayoutEngine::stretchFactor(QGraphicsLayoutItem *layoutItem, Qt::Orientation orientation) const
{
    if (QGraphicsGridLayoutEngineItem *item = findLayoutItem(layoutItem))
        return item->stretchFactor(orientation);
    return 0;
}

QT_END_NAMESPACE