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50
51#include <QtWidgets>
52
53#include "mainwidget.h"
54
55static void showHelp(QCommandLineParser &parser, const QString errorMessage = QString())
56{
57 QString text;
58 QTextStream str(&text);
59 str << "<html><head/><body>";
60 if (!errorMessage.isEmpty())
61 str << "<p>" << errorMessage << "</p>";
62 str << "<pre>" << parser.helpText() << "</pre></body></html>";
63 QMessageBox box(errorMessage.isEmpty() ? QMessageBox::Information : QMessageBox::Warning,
64 QGuiApplication::applicationDisplayName(), text,
65 QMessageBox::Ok);
66 box.setTextInteractionFlags(Qt::TextBrowserInteraction);
67 box.exec();
68}
69
70int main(int argc, char *argv[])
71{
72 QApplication app(argc, argv);
73 QCoreApplication::setApplicationVersion(QT_VERSION_STR);
74 QCoreApplication::setApplicationName(QStringLiteral("imagegestures"));
75 QGuiApplication::setApplicationDisplayName(QStringLiteral("Image Gestures Example"));
76
77 QCommandLineParser commandLineParser;
78 const QCommandLineOption disablePanOption("no-pan", "Disable pan gesture");
79 commandLineParser.addOption(commandLineOption: disablePanOption);
80 const QCommandLineOption disablePinchOption("no-pinch", "Disable pinch gesture");
81 commandLineParser.addOption(commandLineOption: disablePinchOption);
82 const QCommandLineOption disableSwipeOption("no-swipe", "Disable swipe gesture");
83 commandLineParser.addOption(commandLineOption: disableSwipeOption);
84 const QCommandLineOption helpOption = commandLineParser.addHelpOption();
85 commandLineParser.addPositionalArgument(QStringLiteral("Directory"),
86 QStringLiteral("Directory to display"));
87
88 const QString description = QGuiApplication::applicationDisplayName()
89 + QLatin1String("\n\nEnable \"debug\" on the logging category \"qt.examples.imagegestures\" in order to\n"
90 "in order to obtain verbose information about Qt's gesture event processing,\n"
91 "for example by setting the environment variables QT_LOGGING_RULES to\n"
92 "qt.examples.imagegestures.debug=true\n");
93 commandLineParser.setApplicationDescription(description);
94
95 commandLineParser.process(arguments: QCoreApplication::arguments());
96
97 QStringList arguments = commandLineParser.positionalArguments();
98 if (!arguments.isEmpty() && !QFileInfo(arguments.front()).isDir()) {
99 showHelp(parser&: commandLineParser,
100 errorMessage: QLatin1Char('"') + QDir::toNativeSeparators(pathName: arguments.front())
101 + QStringLiteral("\" is not a directory."));
102 return -1;
103 }
104
105 QVector<Qt::GestureType> gestures;
106 if (!commandLineParser.isSet(option: disablePanOption))
107 gestures << Qt::PanGesture;
108 if (!commandLineParser.isSet(option: disablePinchOption))
109 gestures << Qt::PinchGesture;
110 if (!commandLineParser.isSet(option: disableSwipeOption))
111 gestures << Qt::SwipeGesture;
112
113 MainWidget w;
114 w.grabGestures(gestures);
115 w.show();
116
117 if (arguments.isEmpty()) {
118 const QStringList picturesLocations = QStandardPaths::standardLocations(type: QStandardPaths::PicturesLocation);
119 const QString directory =
120 QFileDialog::getExistingDirectory(parent: &w, caption: "Select image folder",
121 dir: picturesLocations.isEmpty() ? QString() : picturesLocations.front());
122 if (directory.isEmpty())
123 return 0;
124 arguments.append(t: directory);
125 }
126
127 w.openDirectory(path: arguments.front());
128
129 return app.exec();
130}
131

source code of qtbase/examples/widgets/gestures/imagegestures/main.cpp