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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the examples 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 The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://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 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.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <qmath.h>
#include <QGraphicsLinearLayout>
#include <QGraphicsScene>
#include "listitemcontainer.h"
#include "abstractviewitem.h"
#include "recycledlistitem.h"
#include "listitemcache.h"
#include "itemrecyclinglist.h"
ListItemContainer::ListItemContainer(int bufferSize, ItemRecyclingList *view, QGraphicsWidget *parent)
: AbstractItemContainer(bufferSize, parent)
, m_view(view)
, m_layout(new QGraphicsLinearLayout(Qt::Vertical))
, m_listItemCaching(false)
{
setContentsMargins(0,0,0,0);
m_layout->setContentsMargins(0,0,0,0);
m_layout->setSpacing(0);
setLayout(m_layout);
}
/*virtual*/
ListItemContainer::~ListItemContainer()
{
setListItemCaching(false);
for (int i = 0; i < m_items.count(); ++i) {
m_layout->removeItem(m_items.at(i));
m_items.at(i)->setParentItem(0);
}
qDeleteAll(m_items);
m_items.clear();
}
bool ListItemContainer::listItemCaching() const
{
return m_listItemCaching;
}
void ListItemContainer::setListItemCaching(const bool enabled)
{
if (m_listItemCaching == enabled)
return;
m_listItemCaching = enabled;
const int itemCount = m_layout->count();
for (int i = 0; i < itemCount; ++i)
setListItemCaching(enabled, i);
}
/*virtual*/
void ListItemContainer::adjustVisibleContainerSize(const QSizeF &size)
{
m_layout->setPreferredWidth(size.width());
}
/*virtual*/
void ListItemContainer::addItemToVisibleLayout(int index, AbstractViewItem *item)
{
m_layout->insertItem(index,item);
setListItemCaching(m_listItemCaching, index);
}
/*virtual*/
void ListItemContainer::removeItemFromVisibleLayout(AbstractViewItem *item)
{
m_layout->removeItem(item);
RecycledListItem *recycledItem = static_cast<RecycledListItem*>(item);
if (!recycledItem)
return;
ListItem *listItem = recycledItem->item();
setListItemCaching(false, listItem);
}
/*virtual*/
int ListItemContainer::maxItemCountInItemBuffer() const
{
int count = AbstractItemContainer::maxItemCountInItemBuffer();
if (count > 0) {
int currentItemCount = m_items.count();
qreal heightOfOneItem = 0;
if (currentItemCount > 0)
{
heightOfOneItem = m_layout->effectiveSizeHint(Qt::PreferredSize).height() / currentItemCount;
}
int guess = 0;
if( heightOfOneItem <= 0 ) {
if (m_prototype) {
heightOfOneItem = m_prototype->effectiveSizeHint(Qt::PreferredSize).height();
}
else
heightOfOneItem = 50; // TODO magic number, do we have better guess if prototype is not set?
}
if (heightOfOneItem > 0) {
guess = qCeil(m_itemView->boundingRect().height() / heightOfOneItem) + m_bufferSize;
if (guess < currentItemCount) {
if( guess > currentItemCount-2) { // TODO magic number here, Can we use buffer size?
guess = currentItemCount;
}
}
}
count = qMin(guess, count);
}
return count;
}
void ListItemContainer::setListItemCaching(const bool enabled, const int index)
{
RecycledListItem *recycledItem = static_cast<RecycledListItem*>(m_layout->itemAt(index));
if (!recycledItem)
return;
ListItem *listItem = recycledItem->item();
if (!listItem)
return;
setListItemCaching(enabled, listItem);
}
void ListItemContainer::setListItemCaching(const bool enabled, ListItem *listItem)
{
if (!listItem)
return;
// Deletes the effect.
listItem->setGraphicsEffect(0);
if (enabled) {
ListItemCache* cache = new ListItemCache;
Q_ASSERT(!listItem->graphicsEffect());
listItem->setGraphicsEffect(cache);
}
}
void ListItemContainer::setTwoColumns(const bool twoColumns)
{
AbstractItemContainer::setTwoColumns(twoColumns);
if (!m_layout->isActivated())
m_layout->activate();
}
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