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/****************************************************************************
**
** Copyright (C) 2016 Ivan Vizir <define-true-false@yandex.com>
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtWinExtras 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QQUICKICONLOADER_P_H
#define QQUICKICONLOADER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QObject>
#include <QVariant>
#include <QUrl>
#include <QIcon>
#include <QPixmap>
#include <QDebug>
QT_BEGIN_NAMESPACE
class QIcon;
class QQmlEngine;
class QNetworkReply;
class QQuickIconLoader
{
public:
enum LoadResult {
LoadOk,
LoadError,
LoadNetworkRequestStarted,
};
// Load a QIcon (pass type = QMetaType::QIcon) or a QPixmap (pass type =
// QMetaType::QPixmap) from url. The function takes an object and member
// function pointer to a slot accepting a QVariant. For resources that can
// loaded synchronously ("file", "qrc" or "image"), the member function pointer
// will be invoked immediately with the result. For network resources, it will be
// connected to an object handling the network reply and invoked once it finishes.
template <typename Object>
static LoadResult load(const QUrl &url, const QQmlEngine *engine,
QVariant::Type type, const QSize &requestedSize,
Object *receiver, void (Object::*function)(const QVariant &));
private:
QQuickIconLoader() = default;
static QVariant loadFromFile(const QUrl &url, QVariant::Type type);
static QVariant loadFromImageProvider(const QUrl &url, const QQmlEngine *engine,
QVariant::Type type, QSize requestedSize);
static QNetworkReply *loadFromNetwork(const QUrl &url, const QQmlEngine *engine);
};
// Internal handler which loads the resource once QNetworkReply finishes
class QQuickIconLoaderNetworkReplyHandler : public QObject
{
Q_OBJECT
public:
explicit QQuickIconLoaderNetworkReplyHandler(QNetworkReply *reply, QVariant::Type);
Q_SIGNALS:
void finished(const QVariant &);
private Q_SLOTS:
void onRequestFinished();
private:
const QVariant::Type m_type;
};
template <typename Object>
QQuickIconLoader::LoadResult
QQuickIconLoader::load(const QUrl &url, const QQmlEngine *engine,
QVariant::Type type, const QSize &requestedSize,
Object *receiver, void (Object::*function)(const QVariant &))
{
const QString scheme = url.scheme();
if (scheme.startsWith(QLatin1String("http"))) {
if (QNetworkReply *reply = QQuickIconLoader::loadFromNetwork(url, engine)) {
auto *handler = new QQuickIconLoaderNetworkReplyHandler(reply, type);
QObject::connect(handler, &QQuickIconLoaderNetworkReplyHandler::finished, receiver, function);
return LoadNetworkRequestStarted;
}
return LoadError;
}
const QVariant resource = scheme == QLatin1String("image")
? QQuickIconLoader::loadFromImageProvider(url, engine, type, requestedSize)
: QQuickIconLoader::loadFromFile(url, type); // qrc, file
if (resource.isValid()) {
(receiver->*function)(resource);
return LoadOk;
}
return LoadError;
}
QT_END_NAMESPACE
#endif // QQUICKICONLOADER_P_H
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