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Diffstat (limited to 'src/declarative/graphicsitems/qmlgraphicsrepeater.cpp')
| -rw-r--r-- | src/declarative/graphicsitems/qmlgraphicsrepeater.cpp | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/src/declarative/graphicsitems/qmlgraphicsrepeater.cpp b/src/declarative/graphicsitems/qmlgraphicsrepeater.cpp new file mode 100644 index 0000000..99f0faa --- /dev/null +++ b/src/declarative/graphicsitems/qmlgraphicsrepeater.cpp @@ -0,0 +1,320 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** 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 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qmlgraphicsrepeater_p.h" +#include "qmlgraphicsrepeater_p_p.h" + +#include "qmlgraphicsvisualitemmodel_p.h" + +#include <qmllistaccessor_p.h> + +#include <qlistmodelinterface_p.h> + +QT_BEGIN_NAMESPACE +QmlGraphicsRepeaterPrivate::QmlGraphicsRepeaterPrivate() +: model(0), ownModel(false) +{ +} + +QmlGraphicsRepeaterPrivate::~QmlGraphicsRepeaterPrivate() +{ + if (ownModel) + delete model; +} + +QML_DEFINE_TYPE(Qt,4,6,Repeater,QmlGraphicsRepeater) + +/*! + \qmlclass Repeater QmlGraphicsRepeater + \inherits Item + + \brief The Repeater item allows you to repeat a component based on a model. + + The Repeater item is used when you want to create a large number of + similar items. For each entry in the model, an item is instantiated + in a context seeded with data from the model. If the repeater will + be instantiating a large number of instances, it may be more efficient to + use one of Qt Declarative's \l {xmlViews}{view items}. + + The model may be either an object list, a string list, a number or a Qt model. + In each case, the data element and the index is exposed to each instantiated + component. + + The index is always exposed as an accessible \c index property. + In the case of an object or string list, the data element (of type string + or object) is available as the \c modelData property. In the case of a Qt model, + all roles are available as named properties just like in the view classes. The + following example shows how to use the index property inside the instantiated + items. + + \snippet doc/src/snippets/declarative/repeater-index.qml 0 + + \image repeater-index.png + + Items instantiated by the Repeater are inserted, in order, as + children of the Repeater's parent. The insertion starts immediately after + the repeater's position in its parent stacking list. This is to allow + you to use a Repeater inside a layout. The following QML example shows how + the instantiated items would visually appear stacked between the red and + blue rectangles. + + \snippet doc/src/snippets/declarative/repeater.qml 0 + + \image repeater.png + + The repeater instance continues to own all items it instantiates, even + if they are otherwise manipulated. It is illegal to manually remove an item + created by the Repeater. + */ + +/*! + \internal + \class QmlGraphicsRepeater + \qmlclass Repeater + + XXX Repeater is very conservative in how it instatiates/deletes items. Also + new model entries will not be created and old ones will not be removed. + */ + +/*! + Create a new QmlGraphicsRepeater instance. + */ +QmlGraphicsRepeater::QmlGraphicsRepeater(QmlGraphicsItem *parent) + : QmlGraphicsItem(*(new QmlGraphicsRepeaterPrivate), parent) +{ +} + +/*! + Destroy the repeater instance. All items it instantiated are also + destroyed. + */ +QmlGraphicsRepeater::~QmlGraphicsRepeater() +{ +} + +/*! + \qmlproperty any Repeater::model + + The model providing data for the repeater. + + The model may be either an object list, a string list, a number or a Qt model. + In each case, the data element and the index is exposed to each instantiated + component. The index is always exposed as an accessible \c index property. + In the case of an object or string list, the data element (of type string + or object) is available as the \c modelData property. In the case of a Qt model, + all roles are available as named properties just like in the view classes. + + As a special case the model can also be merely a number. In this case it will + create that many instances of the component. They will also be assigned an index + based on the order they are created. + + Models can also be created directly in QML, using a \l{ListModel} or \l{XmlListModel}. + + \sa {qmlmodels}{Data Models} +*/ +QVariant QmlGraphicsRepeater::model() const +{ + Q_D(const QmlGraphicsRepeater); + return d->dataSource; +} + +void QmlGraphicsRepeater::setModel(const QVariant &model) +{ + Q_D(QmlGraphicsRepeater); + clear(); + if (d->model) { + disconnect(d->model, SIGNAL(itemsInserted(int,int)), this, SLOT(itemsInserted(int,int))); + disconnect(d->model, SIGNAL(itemsRemoved(int,int)), this, SLOT(itemsRemoved(int,int))); + disconnect(d->model, SIGNAL(itemsMoved(int,int,int)), this, SLOT(itemsMoved(int,int,int))); + /* + disconnect(d->model, SIGNAL(createdItem(int, QmlGraphicsItem*)), this, SLOT(createdItem(int,QmlGraphicsItem*))); + disconnect(d->model, SIGNAL(destroyingItem(QmlGraphicsItem*)), this, SLOT(destroyingItem(QmlGraphicsItem*))); + */ + } + d->dataSource = model; + QObject *object = qvariant_cast<QObject*>(model); + QmlGraphicsVisualModel *vim = 0; + if (object && (vim = qobject_cast<QmlGraphicsVisualModel *>(object))) { + if (d->ownModel) { + delete d->model; + d->ownModel = false; + } + d->model = vim; + } else { + if (!d->ownModel) { + d->model = new QmlGraphicsVisualDataModel(qmlContext(this)); + d->ownModel = true; + } + if (QmlGraphicsVisualDataModel *dataModel = qobject_cast<QmlGraphicsVisualDataModel*>(d->model)) + dataModel->setModel(model); + } + if (d->model) { + connect(d->model, SIGNAL(itemsInserted(int,int)), this, SLOT(itemsInserted(int,int))); + connect(d->model, SIGNAL(itemsRemoved(int,int)), this, SLOT(itemsRemoved(int,int))); + connect(d->model, SIGNAL(itemsMoved(int,int,int)), this, SLOT(itemsMoved(int,int,int))); + /* + connect(d->model, SIGNAL(createdItem(int, QmlGraphicsItem*)), this, SLOT(createdItem(int,QmlGraphicsItem*))); + connect(d->model, SIGNAL(destroyingItem(QmlGraphicsItem*)), this, SLOT(destroyingItem(QmlGraphicsItem*))); + */ + regenerate(); + emit countChanged(); + } +} + +/*! + \qmlproperty Component Repeater::delegate + \default + + The delegate provides a template defining each item instantiated by the repeater. + The index is exposed as an accessible \c index property. Properties of the + model are also available depending upon the type of \l {qmlmodels}{Data Model}. + */ +QmlComponent *QmlGraphicsRepeater::delegate() const +{ + Q_D(const QmlGraphicsRepeater); + if (d->model) { + if (QmlGraphicsVisualDataModel *dataModel = qobject_cast<QmlGraphicsVisualDataModel*>(d->model)) + return dataModel->delegate(); + } + + return 0; +} + +void QmlGraphicsRepeater::setDelegate(QmlComponent *delegate) +{ + Q_D(QmlGraphicsRepeater); + if (!d->ownModel) { + d->model = new QmlGraphicsVisualDataModel(qmlContext(this)); + d->ownModel = true; + } + if (QmlGraphicsVisualDataModel *dataModel = qobject_cast<QmlGraphicsVisualDataModel*>(d->model)) { + dataModel->setDelegate(delegate); + regenerate(); + } +} + +/*! + \qmlproperty int Repeater::count + + This property holds the number of items in the repeater. +*/ +int QmlGraphicsRepeater::count() const +{ + Q_D(const QmlGraphicsRepeater); + if (d->model) + return d->model->count(); + return 0; +} + + +/*! + \internal + */ +void QmlGraphicsRepeater::componentComplete() +{ + QmlGraphicsItem::componentComplete(); + regenerate(); +} + +/*! + \internal + */ +QVariant QmlGraphicsRepeater::itemChange(GraphicsItemChange change, + const QVariant &value) +{ + QVariant rv = QmlGraphicsItem::itemChange(change, value); + if (change == ItemParentHasChanged) { + regenerate(); + } + + return rv; +} + +void QmlGraphicsRepeater::clear() +{ + Q_D(QmlGraphicsRepeater); + if (d->model) { + foreach (QmlGraphicsItem *item, d->deletables) { + item->setParentItem(this); + d->model->release(item); + } + } + d->deletables.clear(); +} + +/*! + \internal + */ +void QmlGraphicsRepeater::regenerate() +{ + Q_D(QmlGraphicsRepeater); + + clear(); + + if (!d->model || !d->model->count() || !d->model->isValid() || !parentItem() || !isComponentComplete()) + return; + + for (int ii = 0; ii < count(); ++ii) { + QmlGraphicsItem *item = d->model->item(ii); + if (item) { + item->setParent(parentItem()); + item->stackBefore(this); + d->deletables << item; + } + } +} + +void QmlGraphicsRepeater::itemsInserted(int, int) +{ + regenerate(); +} + +void QmlGraphicsRepeater::itemsRemoved(int, int) +{ + regenerate(); +} + +void QmlGraphicsRepeater::itemsMoved(int,int,int) +{ + regenerate(); +} + +QT_END_NAMESPACE |