5635823e17
As in the past, to avoid rewriting various autotests that contain line-number information, an extra blank line has been inserted at the end of the license text to ensure that this commit does not change the total number of lines in the license header. Change-Id: I311e001373776812699d6efc045b5f742890c689 Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>
442 lines
14 KiB
C++
442 lines
14 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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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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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include <QGraphicsLayout>
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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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AbstractItemView::AbstractItemView(QGraphicsWidget *parent)
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: AbstractScrollArea(parent),
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m_model(0),
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m_rootIndex(),
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m_container(0),
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m_selectionModel(0),
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m_currentIndex(),
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m_scroller()
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{
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setRootIndex(QModelIndex());
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}
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/*virtual*/
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AbstractItemView::~AbstractItemView()
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{
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}
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/*virtual*/
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void AbstractItemView::setModel(QAbstractItemModel *model, AbstractViewItem *prototype)
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{
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if( m_model == model || !model)
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return;
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if (m_model) {
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disconnect(m_model, SIGNAL(destroyed()),
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this, SLOT(_q_modelDestroyed()));
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disconnect(m_model, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
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this, SLOT( dataChanged(QModelIndex,QModelIndex)));
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disconnect(m_model, SIGNAL(rowsInserted(QModelIndex,int,int)),
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this, SLOT(rowsInserted(QModelIndex,int,int)));
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disconnect(m_model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
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this, SLOT(rowsRemoved(QModelIndex,int,int)));
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disconnect(m_model, SIGNAL(rowsAboutToBeRemoved(QModelIndex,int,int)),
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this, SLOT(rowsAboutToBeRemoved(QModelIndex,int,int)));
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disconnect(m_model, SIGNAL(rowsAboutToBeInserted(QModelIndex,int,int)),
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this, SLOT(rowsAboutToBeInserted(QModelIndex,int,int)));
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disconnect(m_model, SIGNAL(columnsInserted(QModelIndex,int,int)),
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this, SLOT(columnsInserted(QModelIndex,int,int)));
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disconnect(m_model, SIGNAL(columnsAboutToBeInserted(QModelIndex,int,int)),
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this, SLOT(columnsAboutToBeInserted(QModelIndex,int,int)));
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disconnect(m_model, SIGNAL(columnsRemoved(QModelIndex,int,int)),
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this, SLOT(columnsRemoved(QModelIndex,int,int)));
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disconnect(m_model, SIGNAL(columnsAboutToBeRemoved(QModelIndex,int,int)),
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this, SLOT(columnsAboutToBeRemoved(QModelIndex,int,int)));
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disconnect(m_model, SIGNAL(modelReset()), this, SLOT(reset()));
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disconnect(m_model, SIGNAL(layoutChanged()), this, SLOT(_q_layoutChanged()));
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m_model = 0;
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}
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setSelectionModel(0);
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m_currentIndex = QModelIndex();
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m_rootIndex = QModelIndex();
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m_model = model;
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Q_ASSERT_X(m_model->index(0,0) == m_model->index(0,0),
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"AbstractItemView::setModel",
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"A model should return the exact same index "
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"(including its internal id/pointer) when asked for it twice in a row.");
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Q_ASSERT_X(m_model->index(0,0).parent() == QModelIndex(),
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"AbstractItemView::setModel",
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"The parent of a top level index should be invalid");
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connect(m_model, SIGNAL(destroyed()), this, SLOT(modelDestroyed()));
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connect(m_model, SIGNAL(dataChanged(QModelIndex,QModelIndex)),
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this, SLOT( dataChanged(QModelIndex,QModelIndex)));
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connect(m_model, SIGNAL(rowsAboutToBeInserted(QModelIndex,int,int)),
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this, SLOT(rowsAboutToBeInserted(QModelIndex,int,int)));
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connect(m_model, SIGNAL(rowsInserted(QModelIndex,int,int)),
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this, SLOT(rowsInserted(QModelIndex,int,int)));
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connect(m_model, SIGNAL(rowsAboutToBeRemoved(QModelIndex,int,int)),
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this, SLOT(rowsAboutToBeRemoved(QModelIndex,int,int)));
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connect(m_model, SIGNAL(rowsRemoved(QModelIndex,int,int)),
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this, SLOT(rowsRemoved(QModelIndex,int,int)));
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connect(m_model, SIGNAL(modelReset()), this, SLOT(reset()));
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connect(m_model, SIGNAL(layoutChanged()), this, SLOT(layoutChanged()));
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setSelectionModel(new QItemSelectionModel(m_model));
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if (prototype && m_container) {
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m_container->setItemPrototype(prototype);
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m_container->reset();
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}
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}
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/*virtual*/
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void AbstractItemView::setContainer(AbstractItemContainer *container)
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{
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m_container = container;
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m_container->setItemView(this);
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m_container->setParentItem(viewport());
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viewport()->setFlag(
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QGraphicsItem::ItemClipsChildrenToShape, true);
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m_scroller.setScrollable(this);
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installEventFilter(&m_scroller);
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}
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/*virtual*/
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void AbstractItemView::setRootIndex(const QModelIndex &index)
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{
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m_rootIndex = index;
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// TODO fix this if we change index, container should be updated? Or do we need root index?
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}
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/*virtual*/
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int AbstractItemView::indexCount() const
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{
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if (m_model)
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return m_model->rowCount(m_rootIndex);
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return 0;
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}
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/*virtual*/
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QAbstractItemModel* AbstractItemView::model() const
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{
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return m_model;
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}
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/*virtual*/
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QModelIndex AbstractItemView::nextIndex(const QModelIndex &index) const
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{
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if (!m_model)
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return QModelIndex();
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if (index.isValid())
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return m_model->index(index.row() + 1, 0, m_rootIndex);
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else
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return m_model->index(0, 0, m_rootIndex);
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}
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/*virtual*/
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QModelIndex AbstractItemView::previousIndex(const QModelIndex &index) const
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{
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if (!m_model)
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return QModelIndex();
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if (index.isValid())
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return m_model->index(index.row() - 1, 0, m_rootIndex);
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else
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return m_model->index(m_model->rowCount(m_rootIndex) - 1, 0, m_rootIndex);
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}
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/*virtual*/
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void AbstractItemView::setItemPrototype(AbstractViewItem* prototype)
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{
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if (prototype && m_container) {
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m_container->setItemPrototype(prototype);
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m_container->reset();
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}
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}
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void AbstractItemView::setSelectionModel(QItemSelectionModel *smodel)
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{
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if (smodel && smodel->model() != m_model) {
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return;
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}
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if (m_selectionModel) {
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disconnect(m_selectionModel, SIGNAL(selectionChanged(QItemSelection, QItemSelection)),
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this, SLOT(currentSelectionChanged(QItemSelection, QItemSelection)));
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disconnect(m_selectionModel, SIGNAL(currentChanged(QModelIndex, QModelIndex)),
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this, SLOT(currentIndexChanged(QModelIndex, QModelIndex)));
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delete m_selectionModel;
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m_selectionModel = 0;
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}
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m_selectionModel = smodel;
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if (m_selectionModel) {
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connect(m_selectionModel, SIGNAL(selectionChanged(QItemSelection, QItemSelection)),
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this, SLOT(currentSelectionChanged(QItemSelection, QItemSelection)));
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connect(m_selectionModel, SIGNAL(currentChanged(QModelIndex, QModelIndex)),
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this, SLOT(currentIndexChanged(QModelIndex, QModelIndex)));
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}
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}
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/*virtual*/
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void AbstractItemView::currentIndexChanged(const QModelIndex ¤t, const QModelIndex &previous)
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{
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Q_UNUSED(previous)
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if (current != m_currentIndex)
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m_currentIndex = current;
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}
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/*virtual*/
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void AbstractItemView::currentSelectionChanged(const QItemSelection &selected,
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const QItemSelection &deselected)
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{
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Q_UNUSED(selected)
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Q_UNUSED(deselected)
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}
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/*virtual*/
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void AbstractItemView::dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight)
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{
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Q_UNUSED(topLeft)
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Q_UNUSED(bottomRight)
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// TODO implement if we like to edit view items.
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}
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/*virtual*/
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void AbstractItemView::rowsAboutToBeInserted(const QModelIndex &index, int start, int end)
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{
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Q_UNUSED(index)
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Q_UNUSED(start)
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Q_UNUSED(end)
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// TODO implement
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}
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/*virtual*/
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void AbstractItemView::rowsAboutToBeRemoved(const QModelIndex &index,int start, int end)
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{
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Q_UNUSED(index)
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Q_UNUSED(start)
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Q_UNUSED(end)
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}
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/*virtual*/
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void AbstractItemView::rowsRemoved(const QModelIndex &parent,int start, int end)
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{
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Q_UNUSED(parent)
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Q_UNUSED(start)
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Q_UNUSED(end)
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if (start <= m_currentIndex.row() && m_currentIndex.row() <= end) {
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QModelIndex newCurrentIndex = m_model->index(start, 0, m_rootIndex);
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if (!newCurrentIndex.isValid()) {
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newCurrentIndex = m_model->index(qMax(0,start - 1), 0, m_rootIndex);
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}
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if (m_selectionModel) {
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m_selectionModel->setCurrentIndex(newCurrentIndex, QItemSelectionModel::NoUpdate);
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}
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}
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for (int i = end; i >= start; --i) //The items are already removed from the model.
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m_container->removeItem(QModelIndex()); // Indexes are already invalid.
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}
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/*virtual*/
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void AbstractItemView::reset()
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{
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m_rootIndex = QModelIndex();
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if (m_container)
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m_container->reset();
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setCurrentIndex(QModelIndex());
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ScrollBar *sb = verticalScrollBar();
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if (sb)
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sb->setSliderSize(0);
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}
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/*virtual*/
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void AbstractItemView::rowsInserted(const QModelIndex &parent, int start, int end)
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{
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if (!m_container)
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return;
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for (int i = start; i <= end; ++i)
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m_container->addItem(m_model->index(i, 0, parent));
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refreshContainerGeometry();
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}
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/*virtual*/
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void AbstractItemView::modelDestroyed()
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{
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m_model = 0;
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setSelectionModel(0);
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reset();
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}
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/*virtual*/
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void AbstractItemView::layoutChanged()
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{
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m_container->reset();
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}
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bool AbstractItemView::event(QEvent *e)
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{
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bool result = AbstractScrollArea::event(e);
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if (e && e->type()==QEvent::LayoutRequest) {
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refreshContainerGeometry();
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result = true;
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}
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if (e && e->type()==QEvent::GraphicsSceneResize) {
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m_scroller.stopScrolling();
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refreshContainerGeometry();
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m_container->resize(this->size().width()-verticalScrollBar()->size().width(),
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m_container->preferredHeight());
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if(verticalScrollBar()->sliderPosition() > verticalScrollBar()->sliderSize())
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verticalScrollBar()->setSliderPosition(verticalScrollBar()->sliderSize());
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result = true;
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}
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return result;
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}
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void AbstractItemView::setCurrentIndex(const QModelIndex &index, QItemSelectionModel::SelectionFlags selectionFlag)
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{
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if (m_selectionModel)
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m_selectionModel->setCurrentIndex(index, selectionFlag);
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}
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void AbstractItemView::refreshContainerGeometry()
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{
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if (!m_container || !m_model)
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return;
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if (m_container->layout() && !m_container->layout()->isActivated())
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m_container->layout()->activate();
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ScrollBar *sb = verticalScrollBar();
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if (sb) {
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AbstractViewItem *item = m_container->itemAt(0);
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if (item) {
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qreal oneItemH = item->size().height();
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sb->setSliderSize(oneItemH*m_model->rowCount(m_rootIndex)-size().height());
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}
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if (!sb->isVisible() && verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOff &&
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contentsRect().height() < m_container->boundingRect().height())
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sb->show();
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}
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}
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void AbstractItemView::scrollContentsBy(qreal dx, qreal dy)
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{
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AbstractScrollArea::scrollContentsBy(dx, dy);
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if (!viewport() || !m_container || (m_container && m_container->itemCount() <= 0) ||
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!m_model || (m_model && m_model->rowCount() <= 0) ||
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(viewport() && viewport()->boundingRect().height() < contentsRect().height()))
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return;
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qreal itemH = 1;
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AbstractViewItem *item = m_container->itemAt(0);
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if(item && item->size().height() > 1) {
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itemH = item->size().height();
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}
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else if(item && item->preferredHeight() > 1) {
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itemH = item->preferredHeight();
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}
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qreal vpx = m_container->pos().x();
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qreal vpy = m_container->pos().y();
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if ((vpy+m_container->size().height()-dy > pos().y()+size().height()) &&
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(qAbs(dy) < itemH) && (vpy-dy <= 0)) {
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m_container->setPos(vpx, vpy-dy);
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}
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else {
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qreal vPos = verticalScrollBar()->sliderPosition();
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int startRow = m_model->index(vPos/itemH, 0).row();
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int itemsInContainer = m_container->itemCount();
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for (int i = 0; i<itemsInContainer; ++i) {
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AbstractViewItem *changedItem = m_container->itemAt(i);
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changedItem->setModelIndex(m_model->index(startRow+i,0));
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m_container->setListItemCaching(listItemCaching(), i);
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}
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qreal diff = vPos-startRow*itemH;
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if (diff < 0)
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m_container->setPos(vpx, diff);
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else
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m_container->setPos(vpx, -diff);
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}
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}
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void AbstractItemView::changeTheme()
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{
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if (m_container)
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m_container->themeChange();
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}
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void AbstractItemView::updateViewContent()
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{
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if (m_container)
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m_container->updateContent();
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}
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