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Diffstat (limited to 'src/gui/text/qtextdocumentresourceprovider.cpp')
-rw-r--r-- | src/gui/text/qtextdocumentresourceprovider.cpp | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/src/gui/text/qtextdocumentresourceprovider.cpp b/src/gui/text/qtextdocumentresourceprovider.cpp new file mode 100644 index 0000000000..1a03e1bb44 --- /dev/null +++ b/src/gui/text/qtextdocumentresourceprovider.cpp @@ -0,0 +1,100 @@ +/**************************************************************************** +** +** Copyright (C) 2020 Alexander Volkov <avolkov@astralinux.ru> +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtGui module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qtextdocumentresourceprovider.h" + +#include <QtCore/qatomic.h> + +QT_BEGIN_NAMESPACE + +/*! + \class QTextDocumentResourceProvider + \inmodule QtGui + \since 6.1 + \brief The QTextDocumentResourceProvider is the base class of resource providers for QTextDocument. + + Override resource() in a subclass, and set a subclass instance on a text document via + QTextDocument::setResourceProvider, or on a label via QLabel::setResourceProvider. This + allows customizing how resources are loaded in rich text documents without having to subclass + QTextDocument or QLabel, respectively. + + \note An implementation should be thread-safe if it can be accessed from different threads, + e.g. when the default resource provider lives in the main thread and a QTextDocument lives + outside the main thread. +*/ + +static QAtomicPointer<QTextDocumentResourceProvider> qt_provider; + +/*! + Destroys the resource provider. +*/ +QTextDocumentResourceProvider::~QTextDocumentResourceProvider() +{ + qt_provider.testAndSetRelease(this, nullptr); +} + +/*! + \fn virtual QVariant QTextDocumentResourceProvider::resource(const QUrl &url) = 0; + + Returns data specified by the \a url. + + \sa QTextDocument::loadResource +*/ + +/*! + Returns the default resource provider. + + \sa QTextDocument::loadResource +*/ +QTextDocumentResourceProvider *QTextDocumentResourceProvider::defaultProvider() +{ + return qt_provider.loadAcquire(); +} + +/*! + Set the default resource provider to \a provider. + + \sa QTextDocument::loadResource +*/ +void QTextDocumentResourceProvider::setDefaultProvider(QTextDocumentResourceProvider *provider) +{ + qt_provider.storeRelease(provider); +} + +QT_END_NAMESPACE |