Image Gestures Example▲
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#include <QtWidgets>
#include "mainwidget.h"
static void showHelp(QCommandLineParser &parser, const QString errorMessage = QString())
{
QString text;
QTextStream str(&text);
str << "<html><head/><body>";
if (!errorMessage.isEmpty())
str << "<p>" << errorMessage << "</p>";
str << "<pre>" << parser.helpText() << "</pre></body></html>";
QMessageBox box(errorMessage.isEmpty() ? QMessageBox::Information : QMessageBox::Warning,
QGuiApplication::applicationDisplayName(), text,
QMessageBox::Ok);
box.setTextInteractionFlags(Qt::TextBrowserInteraction);
box.exec();
}
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QCoreApplication::setApplicationVersion(QT_VERSION_STR);
QCoreApplication::setApplicationName(QStringLiteral("imagegestures"));
QGuiApplication::setApplicationDisplayName(QStringLiteral("Image Gestures Example"));
QCommandLineParser commandLineParser;
const QCommandLineOption disablePanOption("no-pan", "Disable pan gesture");
commandLineParser.addOption(disablePanOption);
const QCommandLineOption disablePinchOption("no-pinch", "Disable pinch gesture");
commandLineParser.addOption(disablePinchOption);
const QCommandLineOption disableSwipeOption("no-swipe", "Disable swipe gesture");
commandLineParser.addOption(disableSwipeOption);
const QCommandLineOption helpOption = commandLineParser.addHelpOption();
commandLineParser.addPositionalArgument(QStringLiteral("Directory"),
QStringLiteral("Directory to display"));
const QString description = QGuiApplication::applicationDisplayName()
+ QLatin1String("\n\nEnable \"debug\" on the logging category \"qt.examples.imagegestures\" in order to\n"
"in order to obtain verbose information about Qt's gesture event processing,\n"
"for example by setting the environment variables QT_LOGGING_RULES to\n"
"qt.examples.imagegestures.debug=true\n");
commandLineParser.setApplicationDescription(description);
commandLineParser.process(QCoreApplication::arguments());
QStringList arguments = commandLineParser.positionalArguments();
if (!arguments.isEmpty() && !QFileInfo(arguments.front()).isDir()) {
showHelp(commandLineParser,
QLatin1Char('"') + QDir::toNativeSeparators(arguments.front())
+ QStringLiteral("\" is not a directory."));
return -1;
}
QList<Qt::GestureType> gestures;
if (!commandLineParser.isSet(disablePanOption))
gestures << Qt::PanGesture;
if (!commandLineParser.isSet(disablePinchOption))
gestures << Qt::PinchGesture;
if (!commandLineParser.isSet(disableSwipeOption))
gestures << Qt::SwipeGesture;
MainWidget w;
w.grabGestures(gestures);
w.show();
if (arguments.isEmpty()) {
const QStringList picturesLocations = QStandardPaths::standardLocations(QStandardPaths::PicturesLocation);
const QString directory =
QFileDialog::getExistingDirectory(&w, "Select image folder",
picturesLocations.isEmpty() ? QString() : picturesLocations.front());
if (directory.isEmpty())
return 0;
arguments.append(directory);
}
w.openDirectory(arguments.front());
return app.exec();
}