38be0d1383
This is the beginning of revision history for this module. If you want to look at revision history older than this, please refer to the Qt Git wiki for how to use Git history grafting. At the time of writing, this wiki is located here: http://qt.gitorious.org/qt/pages/GitIntroductionWithQt If you have already performed the grafting and you don't see any history beyond this commit, try running "git log" with the "--follow" argument. Branched from the monolithic repo, Qt master branch, at commit 896db169ea224deb96c59ce8af800d019de63f12
402 lines
11 KiB
C++
402 lines
11 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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** All rights reserved.
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** Contact: Nokia Corporation (qt-info@nokia.com)
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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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** No Commercial Usage
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** This file contains pre-release code and may not be distributed.
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** You may use this file in accordance with the terms and conditions
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** contained in the Technology Preview License Agreement accompanying
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** this package.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: 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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** If you have questions regarding the use of this file, please contact
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** Nokia at qt-info@nokia.com.
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**
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**
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**
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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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#if (QT_VERSION >= 0x040600)
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const bool caching = m_itemView->listItemCaching();
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m_itemView->setListItemCaching(false);
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#endif
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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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#if (QT_VERSION >= 0x040600)
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m_itemView->setListItemCaching(caching);
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#endif
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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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#if (QT_VERSION >= 0x040600)
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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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#endif
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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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