1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
|
/****************************************************************************
**
** Copyright (C) 2013 Ivan Vizir <define-true-false@yandex.com>
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtWinExtras module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QQUICKICONLOADER_P_H
#define QQUICKICONLOADER_P_H
#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() {}
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)) {
QQuickIconLoaderNetworkReplyHandler *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
|
