629d6eda5c
Replace Nokia contact email address with Qt Project website. Change-Id: I431bbbf76d7c27d8b502f87947675c116994c415 Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
396 lines
11 KiB
C++
396 lines
11 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: http://www.qt-project.org/
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**
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** This file is part of the examples of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** GNU Lesser General Public License Usage
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** This file may be used under the terms of the GNU Lesser General Public
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** License version 2.1 as published by the Free Software Foundation and
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** appearing in the file LICENSE.LGPL included in the packaging of this
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** file. Please review the following information to ensure the GNU Lesser
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** General Public License version 2.1 requirements will be met:
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** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Nokia gives you certain additional
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** rights. These rights are described in the Nokia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU General
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** Public License version 3.0 as published by the Free Software Foundation
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** and appearing in the file LICENSE.GPL included in the packaging of this
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** file. Please review the following information to ensure the GNU General
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** Public License version 3.0 requirements will be met:
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** http://www.gnu.org/copyleft/gpl.html.
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**
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** Other Usage
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** Alternatively, this file may be used in accordance with the terms and
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** conditions contained in a signed written agreement between you and Nokia.
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**
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**
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**
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QDebug>
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#include <QGraphicsLayout>
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#include "abstractitemcontainer.h"
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#include "abstractitemview.h"
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#include "abstractviewitem.h"
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#include "scrollbar.h"
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AbstractItemContainer::AbstractItemContainer(int bufferSize, QGraphicsWidget *parent)
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: GvbWidget(parent),
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m_items(),
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m_itemView(0),
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m_prototype(0),
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m_bufferSize(bufferSize),
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m_twoColumns(false)
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{
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}
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AbstractItemContainer::~AbstractItemContainer()
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{
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delete m_prototype;
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m_prototype = 0;
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}
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AbstractViewItem *AbstractItemContainer::prototype()
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{
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return m_prototype;
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}
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int AbstractItemContainer::bufferSize() const
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{
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return m_bufferSize;
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}
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bool AbstractItemContainer::event(QEvent *e)
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{
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if (e->type() == QEvent::LayoutRequest)
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updateItemBuffer();
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return QGraphicsWidget::event(e);
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}
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bool AbstractItemContainer::eventFilter(QObject *obj, QEvent *event)
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{
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if (event->type()==QEvent::GraphicsSceneResize && m_itemView) {
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const bool caching = m_itemView->listItemCaching();
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m_itemView->setListItemCaching(false);
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QSizeF s = m_itemView->size();
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s.setWidth(s.width()-m_itemView->verticalScrollBar()->size().width());
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adjustVisibleContainerSize(s);
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m_itemView->updateViewContent();
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updateItemBuffer();
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m_itemView->setListItemCaching(caching);
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}
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return QGraphicsWidget::eventFilter(obj, event);
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}
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QVariant AbstractItemContainer::itemChange(GraphicsItemChange change, const QVariant &value)
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{
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QVariant ichange = QGraphicsWidget::itemChange(change,value);
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if (change == ItemPositionChange) {
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if (m_itemView && layout() && !layout()->isActivated())
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m_itemView->refreshContainerGeometry();
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}
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return ichange;
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}
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/*virtual*/
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void AbstractItemContainer::setItemView(AbstractItemView *view)
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{
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m_itemView = view;
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if (m_itemView) {
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setParentItem(m_itemView);
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m_itemView->installEventFilter(this);
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}
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}
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/*virtual*/
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void AbstractItemContainer::setItemPrototype(AbstractViewItem *ptype)
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{
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m_prototype = ptype;
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m_prototype->setParentItem(0);
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m_prototype->hide();
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}
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/*virtual*/
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void AbstractItemContainer::reset()
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{
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qDeleteAll(m_items);
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m_items.clear();
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updateItemBuffer();
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}
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/*virtual*/
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void AbstractItemContainer::addItem(const QModelIndex &index)
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{
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if (m_items.count() < maxItemCountInItemBuffer() ||
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(m_items.count() > 0 &&
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m_items.first()->modelIndex().row()-1 <= index.row() &&
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m_items.last()->modelIndex().row() >= index.row())) {
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int itemPos = 0;
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if (m_items.count() != 0)
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itemPos = qMax(0, index.row() - m_items.first()->modelIndex().row());
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if (itemPos >= m_items.count() || m_items.at(itemPos)->modelIndex() != index) {
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AbstractViewItem *item = 0;
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if (m_prototype)
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item = m_prototype->newItemInstance();
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if (item) {
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item->setModel(m_itemView->model());
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item->setTwoColumns(m_twoColumns);
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m_items.insert(itemPos, item);
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addItemToVisibleLayout(itemPos, item);
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if (item->modelIndex() != index) {
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item->setModelIndex(index);
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}
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}
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}
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updateItemBuffer();
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}
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}
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void AbstractItemContainer::removeItem(const QModelIndex &index)
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{
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AbstractViewItem *item = findItemByIndex(index);
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if (item) {
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if (maxItemCountInItemBuffer() < m_items.count()) {
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m_items.removeOne(item);
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removeItemFromVisibleLayout(item);
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delete item;
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}
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else {
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m_items.removeOne(item);
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removeItemFromVisibleLayout(item);
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QModelIndex newIndex = m_itemView->nextIndex(m_items.last()->modelIndex());
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if (newIndex.isValid()) {
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// Item readded as last item in buffer.
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m_items.append(item);
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addItemToVisibleLayout(m_items.count() - 1, item);
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item->setModelIndex(newIndex);
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} else {
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// Item readded as first item in buffer.
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newIndex = m_itemView->previousIndex(m_items.first()->modelIndex());
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m_items.prepend(item);
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addItemToVisibleLayout(0, item);
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item->setModelIndex(newIndex);
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}
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}
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}
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}
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/*virtual*/
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int AbstractItemContainer::itemCount() const
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{
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return m_items.count();
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}
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AbstractViewItem *AbstractItemContainer::firstItem()
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{
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return m_items.first();
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}
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/*virtual*/
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AbstractViewItem* AbstractItemContainer::itemAt(const int row) const
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{
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if (row<0 || row >= m_items.count())
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return 0;
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return m_items.at(row);
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}
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AbstractViewItem* AbstractItemContainer::findItemByIndex(const QModelIndex &index) const
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{
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AbstractViewItem *item = 0;
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for (int i = 0; i < m_items.count(); ++i) {
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if (m_items.at(i)->modelIndex() == index) {
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item = m_items.at(i);
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break;
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}
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}
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return item;
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}
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bool AbstractItemContainer::itemVisibleInView(AbstractViewItem* item, const QRectF &viewRect, bool fullyVisible) const
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{
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if (!item || !m_itemView)
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return false;
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QRectF itemRectBoundingRect = item->mapToItem(m_itemView, item->boundingRect()).boundingRect();
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if (fullyVisible && viewRect.contains(itemRectBoundingRect))
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return true;
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else if (viewRect.intersects(itemRectBoundingRect))
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return true;
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return false;
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}
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void AbstractItemContainer::updateItemBuffer()
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{
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if (!m_itemView || (m_itemView && !m_itemView->boundingRect().isValid()))
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return;
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int maxCount = maxItemCountInItemBuffer();
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if (m_items.count() < maxCount) {
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// New items needs to be added.
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QModelIndex index;
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if (m_items.count() > 0)
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index = m_items.last()->modelIndex();
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while (m_items.count() < maxCount) {
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index = m_itemView->nextIndex(index);
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if (!index.isValid())
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break;
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insertItem(m_items.count(), index);
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}
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index = m_items.first()->modelIndex();
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while (m_items.count() < maxCount) {
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index = m_itemView->previousIndex(index);
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if (!index.isValid())
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break;
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insertItem(0, index);
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}
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}
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QRectF viewRect = boundingRect();
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while (m_items.count() > maxCount) {
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int firstVisible = 0;
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int lastVisible = 0;
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findFirstAndLastVisibleBufferIndex(firstVisible, lastVisible, viewRect, false);
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AbstractViewItem* item = 0;
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if (lastVisible != m_items.count() - 1) {
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item = m_items.takeLast();
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}
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else if (firstVisible != 0 && m_items.first()->modelIndex().row() != firstVisible-1) {
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item = m_items.takeFirst();
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}
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else {
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// All the items are visible. Take the item at the end of the buffer.
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item = m_items.takeLast();
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}
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m_items.removeOne(item);
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removeItemFromVisibleLayout(item);
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delete item;
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}
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}
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void AbstractItemContainer::insertItem(int pos, const QModelIndex &index)
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{
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AbstractViewItem *item = 0;
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if (m_prototype)
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item = m_prototype->newItemInstance();
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if (item) {
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item->setModel(m_itemView->model());
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item->setModelIndex(index);
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item->setTwoColumns(m_twoColumns);
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m_items.insert(pos, item);
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addItemToVisibleLayout(pos, item);
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item->updateItemContents();
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if (pos == 0)
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m_itemView->scrollContentsBy(qreal(0.0),
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item->effectiveSizeHint(Qt::PreferredSize).height());
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}
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}
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void AbstractItemContainer::findFirstAndLastVisibleBufferIndex(int &firstVisibleBufferIndex,
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int &lastVisibleBufferIndex,
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const QRectF &viewRect,
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bool fullyVisible) const
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{
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if (layout() && !layout()->isActivated())
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layout()->activate();
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firstVisibleBufferIndex = -1;
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lastVisibleBufferIndex = -1;
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int count = m_items.count();
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for (int i = 0; i < count; ++i) {
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if (itemVisibleInView(m_items.at(i), viewRect, fullyVisible)) {
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if (firstVisibleBufferIndex == -1)
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firstVisibleBufferIndex = i;
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lastVisibleBufferIndex = i;
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}
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else if ( lastVisibleBufferIndex != -1 )
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break; // lastVisibleBufferIndex is already set
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}
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}
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/*virtual*/
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int AbstractItemContainer::maxItemCountInItemBuffer() const
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{
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if (m_itemView && !m_itemView->boundingRect().isEmpty())
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{
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return m_itemView->indexCount();
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}
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return 0;
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}
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void AbstractItemContainer::themeChange()
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{
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for (int i = 0; i <m_items.count(); ++i)
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m_items.at(i)->themeChange();
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}
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void AbstractItemContainer::updateContent()
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{
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for (int i = 0; i <m_items.count(); ++i)
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m_items.at(i)->updateItemContents();
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}
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void AbstractItemContainer::setSubtreeCacheEnabled(bool enabled)
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{
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for (int i = 0; i <m_items.count(); ++i)
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m_items.at(i)->setSubtreeCacheEnabled(enabled);
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if (m_prototype)
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m_prototype->setSubtreeCacheEnabled(enabled);
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}
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void AbstractItemContainer::setTwoColumns(const bool enabled)
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{
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if (m_twoColumns == enabled)
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return;
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m_twoColumns = enabled;
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for (int i = 0; i < m_items.count(); ++i)
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m_items.at(i)->setTwoColumns(enabled);
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}
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bool AbstractItemContainer::twoColumns()
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{
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return m_twoColumns;
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}
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