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Diffstat (limited to 'src/declarative/items/qsgloader.cpp')
-rw-r--r-- | src/declarative/items/qsgloader.cpp | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/src/declarative/items/qsgloader.cpp b/src/declarative/items/qsgloader.cpp new file mode 100644 index 0000000000..6717098506 --- /dev/null +++ b/src/declarative/items/qsgloader.cpp @@ -0,0 +1,340 @@ +// Commit: 501180c6fbed0857126da2bb0ff1f17ee35472c6 +/**************************************************************************** +** +** Copyright (C) 2011 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 "qsgloader_p_p.h" + +#include <QtDeclarative/qdeclarativeinfo.h> + +#include <private/qdeclarativeengine_p.h> +#include <private/qdeclarativeglobal_p.h> + +QT_BEGIN_NAMESPACE + +QSGLoaderPrivate::QSGLoaderPrivate() + : item(0), component(0), ownComponent(false), updatingSize(false), + itemWidthValid(false), itemHeightValid(false) +{ +} + +QSGLoaderPrivate::~QSGLoaderPrivate() +{ +} + +void QSGLoaderPrivate::itemGeometryChanged(QSGItem *resizeItem, const QRectF &newGeometry, const QRectF &oldGeometry) +{ + if (resizeItem == item) { + if (!updatingSize && newGeometry.width() != oldGeometry.width()) + itemWidthValid = true; + if (!updatingSize && newGeometry.height() != oldGeometry.height()) + itemHeightValid = true; + _q_updateSize(false); + } + QSGItemChangeListener::itemGeometryChanged(resizeItem, newGeometry, oldGeometry); +} + +void QSGLoaderPrivate::clear() +{ + if (ownComponent) { + component->deleteLater(); + component = 0; + ownComponent = false; + } + source = QUrl(); + + if (item) { + QSGItemPrivate *p = QSGItemPrivate::get(item); + p->removeItemChangeListener(this, QSGItemPrivate::Geometry); + + // We can't delete immediately because our item may have triggered + // the Loader to load a different item. + item->setParentItem(0); + item->setVisible(false); + item->deleteLater(); + item = 0; + } +} + +void QSGLoaderPrivate::initResize() +{ + QSGItemPrivate *p = QSGItemPrivate::get(item); + p->addItemChangeListener(this, QSGItemPrivate::Geometry); + // We may override the item's size, so we need to remember + // whether the item provided its own valid size. + itemWidthValid = p->widthValid; + itemHeightValid = p->heightValid; + _q_updateSize(); +} + +QSGLoader::QSGLoader(QSGItem *parent) + : QSGImplicitSizeItem(*(new QSGLoaderPrivate), parent) +{ + setFlag(ItemIsFocusScope); +} + +QSGLoader::~QSGLoader() +{ + Q_D(QSGLoader); + if (d->item) { + QSGItemPrivate *p = QSGItemPrivate::get(d->item); + p->removeItemChangeListener(d, QSGItemPrivate::Geometry); + } +} + +QUrl QSGLoader::source() const +{ + Q_D(const QSGLoader); + return d->source; +} + +void QSGLoader::setSource(const QUrl &url) +{ + Q_D(QSGLoader); + if (d->source == url) + return; + + d->clear(); + + d->source = url; + if (d->source.isEmpty()) { + emit sourceChanged(); + emit statusChanged(); + emit progressChanged(); + emit itemChanged(); + return; + } + + d->component = new QDeclarativeComponent(qmlEngine(this), d->source, this); + d->ownComponent = true; + + if (isComponentComplete()) + d->load(); +} + +QDeclarativeComponent *QSGLoader::sourceComponent() const +{ + Q_D(const QSGLoader); + return d->component; +} + +void QSGLoader::setSourceComponent(QDeclarativeComponent *comp) +{ + Q_D(QSGLoader); + if (comp == d->component) + return; + + d->clear(); + + d->component = comp; + d->ownComponent = false; + if (!d->component) { + emit sourceChanged(); + emit statusChanged(); + emit progressChanged(); + emit itemChanged(); + return; + } + + if (isComponentComplete()) + d->load(); +} + +void QSGLoader::resetSourceComponent() +{ + setSourceComponent(0); +} + +void QSGLoaderPrivate::load() +{ + Q_Q(QSGLoader); + + if (!q->isComponentComplete() || !component) + return; + + if (!component->isLoading()) { + _q_sourceLoaded(); + } else { + QObject::connect(component, SIGNAL(statusChanged(QDeclarativeComponent::Status)), + q, SLOT(_q_sourceLoaded())); + QObject::connect(component, SIGNAL(progressChanged(qreal)), + q, SIGNAL(progressChanged())); + emit q->statusChanged(); + emit q->progressChanged(); + emit q->sourceChanged(); + emit q->itemChanged(); + } +} + +void QSGLoaderPrivate::_q_sourceLoaded() +{ + Q_Q(QSGLoader); + + if (component) { + if (!component->errors().isEmpty()) { + QDeclarativeEnginePrivate::warning(qmlEngine(q), component->errors()); + emit q->sourceChanged(); + emit q->statusChanged(); + emit q->progressChanged(); + return; + } + + QDeclarativeContext *creationContext = component->creationContext(); + if (!creationContext) creationContext = qmlContext(q); + QDeclarativeContext *ctxt = new QDeclarativeContext(creationContext); + ctxt->setContextObject(q); + + QDeclarativeGuard<QDeclarativeComponent> c = component; + QObject *obj = component->beginCreate(ctxt); + if (component != c) { + // component->create could trigger a change in source that causes + // component to be set to something else. In that case we just + // need to cleanup. + if (c) + c->completeCreate(); + delete obj; + delete ctxt; + return; + } + if (obj) { + item = qobject_cast<QSGItem *>(obj); + if (item) { + QDeclarative_setParent_noEvent(ctxt, obj); + QDeclarative_setParent_noEvent(item, q); + item->setParentItem(q); +// item->setFocus(true); + initResize(); + } else { + qmlInfo(q) << QSGLoader::tr("Loader does not support loading non-visual elements."); + delete obj; + delete ctxt; + } + } else { + if (!component->errors().isEmpty()) + QDeclarativeEnginePrivate::warning(qmlEngine(q), component->errors()); + delete obj; + delete ctxt; + source = QUrl(); + } + component->completeCreate(); + emit q->sourceChanged(); + emit q->statusChanged(); + emit q->progressChanged(); + emit q->itemChanged(); + emit q->loaded(); + } +} + +QSGLoader::Status QSGLoader::status() const +{ + Q_D(const QSGLoader); + + if (d->component) + return static_cast<QSGLoader::Status>(d->component->status()); + + if (d->item) + return Ready; + + return d->source.isEmpty() ? Null : Error; +} + +void QSGLoader::componentComplete() +{ + Q_D(QSGLoader); + QSGItem::componentComplete(); + d->load(); +} + +qreal QSGLoader::progress() const +{ + Q_D(const QSGLoader); + + if (d->item) + return 1.0; + + if (d->component) + return d->component->progress(); + + return 0.0; +} + +void QSGLoaderPrivate::_q_updateSize(bool loaderGeometryChanged) +{ + Q_Q(QSGLoader); + if (!item || updatingSize) + return; + + updatingSize = true; + + if (!itemWidthValid) + q->setImplicitWidth(item->implicitWidth()); + else + q->setImplicitWidth(item->width()); + if (loaderGeometryChanged && q->widthValid()) + item->setWidth(q->width()); + + if (!itemHeightValid) + q->setImplicitHeight(item->implicitHeight()); + else + q->setImplicitHeight(item->height()); + if (loaderGeometryChanged && q->heightValid()) + item->setHeight(q->height()); + + updatingSize = false; +} + +QSGItem *QSGLoader::item() const +{ + Q_D(const QSGLoader); + return d->item; +} + +void QSGLoader::geometryChanged(const QRectF &newGeometry, const QRectF &oldGeometry) +{ + Q_D(QSGLoader); + if (newGeometry != oldGeometry) { + d->_q_updateSize(); + } + QSGItem::geometryChanged(newGeometry, oldGeometry); +} + +#include <moc_qsgloader_p.cpp> + +QT_END_NAMESPACE |