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
|
/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the demonstration applications 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 <qdeclarativeextensionplugin.h>
#include <qdeclarativeengine.h>
#include <qdeclarativecontext.h>
#include <qdeclarative.h>
#include <qdeclarativeitem.h>
#include <qdeclarativeimageprovider.h>
#include <qdeclarativeview.h>
#include <QImage>
#include <QPainter>
/*
This example illustrates using a QDeclarativeImageProvider to serve
images asynchronously.
*/
//![0]
class ColorImageProvider : public QDeclarativeImageProvider
{
public:
// This is run in a low priority thread.
QImage request(const QString &id, QSize *size, const QSize &req_size)
{
if (size) *size = QSize(100,50);
QImage image(
req_size.width() > 0 ? req_size.width() : 100,
req_size.height() > 0 ? req_size.height() : 50,
QImage::Format_RGB32);
image.fill(QColor(id).rgba());
QPainter p(&image);
QFont f = p.font();
f.setPixelSize(30);
p.setFont(f);
p.setPen(Qt::black);
if (req_size.isValid())
p.scale(req_size.width()/100.0, req_size.height()/50.0);
p.drawText(QRectF(0,0,100,50),Qt::AlignCenter,id);
return image;
}
};
class ImageProviderExtensionPlugin : public QDeclarativeExtensionPlugin
{
Q_OBJECT
public:
void registerTypes(const char *uri) {
Q_UNUSED(uri);
}
void initializeEngine(QDeclarativeEngine *engine, const char *uri) {
Q_UNUSED(uri);
engine->addImageProvider("colors", new ColorImageProvider);
QStringList dataList;
dataList.append("image://colors/red");
dataList.append("image://colors/green");
dataList.append("image://colors/blue");
dataList.append("image://colors/brown");
dataList.append("image://colors/orange");
dataList.append("image://colors/purple");
dataList.append("image://colors/yellow");
QDeclarativeContext *ctxt = engine->rootContext();
ctxt->setContextProperty("myModel", QVariant::fromValue(dataList));
}
};
#include "imageprovider.moc"
Q_EXPORT_PLUGIN(ImageProviderExtensionPlugin);
//![0]
|
