1/****************************************************************************
2**
3** Copyright (C) 2017 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:BSD$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** BSD License Usage
18** Alternatively, you may use this file under the terms of the BSD license
19** as follows:
20**
21** "Redistribution and use in source and binary forms, with or without
22** modification, are permitted provided that the following conditions are
23** met:
24** * Redistributions of source code must retain the above copyright
25** notice, this list of conditions and the following disclaimer.
26** * Redistributions in binary form must reproduce the above copyright
27** notice, this list of conditions and the following disclaimer in
28** the documentation and/or other materials provided with the
29** distribution.
30** * Neither the name of The Qt Company Ltd nor the names of its
31** contributors may be used to endorse or promote products derived
32** from this software without specific prior written permission.
33**
34**
35** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
36** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
37** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
38** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
39** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
42** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
43** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
44** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
45** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
46**
47** $QT_END_LICENSE$
48**
49****************************************************************************/
50
51#ifdef QT_WIDGETS_LIB
52#include <QtWidgets/QApplication>
53#else
54#include <QtGui/QGuiApplication>
55#endif
56#include <QtQml/QQmlApplicationEngine>
57#include <QtQml/QQmlContext>
58#include <QtQuick/QQuickWindow>
59#include <QtGui/QImageReader>
60#include <QtCore/QCommandLineParser>
61#include <QtCore/QCommandLineOption>
62#include <QtCore/QDebug>
63#include <QtCore/QDir>
64#include <QtCore/QMimeDatabase>
65#include <QtCore/QStandardPaths>
66#include <QtCore/QUrl>
67#ifdef REQUEST_PERMISSIONS_ON_ANDROID
68#include <QtAndroid>
69
70bool requestStoragePermission() {
71 using namespace QtAndroid;
72
73 QString permission = QStringLiteral("android.permission.WRITE_EXTERNAL_STORAGE");
74 const QHash<QString, PermissionResult> results = requestPermissionsSync(QStringList({permission}));
75 if (!results.contains(permission) || results[permission] == PermissionResult::Denied) {
76 qWarning() << "Couldn't get permission: " << permission;
77 return false;
78 }
79
80 return true;
81}
82#endif
83
84static QStringList imageNameFilters()
85{
86 QStringList result;
87 QMimeDatabase mimeDatabase;
88 const auto supportedMimeTypes = QImageReader::supportedMimeTypes();
89 for (const QByteArray &m : supportedMimeTypes) {
90 const auto suffixes = mimeDatabase.mimeTypeForName(nameOrAlias: m).suffixes();
91 for (const QString &suffix : suffixes)
92 result.append(t: QLatin1String("*.") + suffix);
93 }
94 return result;
95}
96
97int main(int argc, char* argv[])
98{
99 // The reason to use QApplication is that QWidget-based dialogs
100 // are the native dialogs on Qt-based platforms like KDE,
101 // but they cannot be instantiated if this is a QGuiApplication.
102#ifdef QT_WIDGETS_LIB
103 QApplication app(argc, argv);
104#else
105 QGuiApplication app(argc, argv);
106#endif
107#ifdef REQUEST_PERMISSIONS_ON_ANDROID
108 if (!requestStoragePermission())
109 return -1;
110#endif
111 QQuickWindow::setDefaultAlphaBuffer(true);
112
113 QCoreApplication::setApplicationName(QStringLiteral("Photosurface"));
114 QCoreApplication::setOrganizationName(QStringLiteral("QtProject"));
115 QCoreApplication::setApplicationVersion(QLatin1String(QT_VERSION_STR));
116 QCommandLineParser parser;
117 parser.setApplicationDescription(QStringLiteral("Qt Quick Demo - Photo Surface"));
118 parser.addHelpOption();
119 parser.addVersionOption();
120 parser.addPositionalArgument(QStringLiteral("directory"),
121 QStringLiteral("The image directory or URL to show."));
122 parser.process(app);
123
124 QUrl initialUrl;
125 if (!parser.positionalArguments().isEmpty()) {
126 initialUrl = QUrl::fromUserInput(userInput: parser.positionalArguments().first(),
127 workingDirectory: QDir::currentPath(), options: QUrl::AssumeLocalFile);
128 if (!initialUrl.isValid()) {
129 qWarning().nospace() << "Invalid argument: \""
130 << parser.positionalArguments().first() << "\": " << initialUrl.errorString();
131 return 1;
132 }
133 }
134
135 const QStringList nameFilters = imageNameFilters();
136
137 QQmlApplicationEngine engine;
138 QQmlContext *context = engine.rootContext();
139
140 QUrl picturesLocationUrl = QUrl::fromLocalFile(localfile: QDir::homePath());
141 const QStringList picturesLocations = QStandardPaths::standardLocations(type: QStandardPaths::PicturesLocation);
142 if (!picturesLocations.isEmpty()) {
143 picturesLocationUrl = QUrl::fromLocalFile(localfile: picturesLocations.first());
144 if (initialUrl.isEmpty()
145 && !QDir(picturesLocations.first()).entryInfoList(nameFilters, filters: QDir::Files).isEmpty()) {
146 initialUrl = picturesLocationUrl;
147 }
148 }
149
150 context->setContextProperty(QStringLiteral("contextPicturesLocation"), picturesLocationUrl);
151 context->setContextProperty(QStringLiteral("contextInitialUrl"), initialUrl);
152 context->setContextProperty(QStringLiteral("contextImageNameFilters"), nameFilters);
153
154 engine.load(url: QUrl("qrc:///photosurface.qml"));
155 if (engine.rootObjects().isEmpty())
156 return -1;
157
158 return app.exec();
159}
160

source code of qtdoc/examples/demos/photosurface/main.cpp