qt5base-lts/tests/auto/uiloader/tst_screenshot/main.cpp

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/*
 * This programm takes a *.ui file and an output dir as argument in order to
 * create a screenshot of the widget defined in the ui file.
 *
 * The screenshot is saved in the output dir (default current dir), ".png" is
 * appended to the ui file name.
 */

#include <QApplication>
#include <QWidget>
#include <QFile>
#include <QDebug>

#include <QDir>

#include <iostream>

using namespace std;


#ifdef Q_WS_QWS
// we don't compile designer on embedded...

int main(int argc, char **argv)
{
    return 0;
}


#else

#include <QUiLoader>

/*
 * Take the path of an ui file and return appropriate QWidget.
 */

QWidget* getWidgetFromUiFile(const QString& fileNameUiFile)
{
    qDebug() << "\t\t\t...loading ui file" << fileNameUiFile;

    QUiLoader loader;
    QFile uiFile(fileNameUiFile);
    if (!uiFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
		qDebug("\t\tError: QFile.open() failed.");
		exit(EXIT_FAILURE);
	}

    QFileInfo fileInfo(fileNameUiFile);
    QDir::setCurrent(fileInfo.absolutePath()); //for the stylesheet to find their images

    QWidget *ui = loader.load(&uiFile);
	if (!ui) {
		qDebug("\t\tError: Quilodader.load() returned NULL pointer.");
		exit(EXIT_FAILURE);
	}
    uiFile.close();

    return ui;
}



/*
 * Takes the actual screenshot.
 *
 * Hint: provide filename without extension, ".png" will be added
 */

void makeScreenshot(QWidget* widget, const QString& fileName, const QString& pathOutputDir)
{
    QFileInfo fileInfo(fileName);
    QString realFileName = fileInfo.completeBaseName() + "." + fileInfo.suffix() + ".png";
    QString realPath = pathOutputDir + "/" + realFileName;


    //QString realFileName = fileName + ".png";
    qDebug() << "\t\t\t...Taking screenshot" << fileInfo.absoluteFilePath();

    //widget->show();
    qApp->processEvents();
    QImage originalPixmap(widget->size(),QImage::Format_ARGB32);
    widget->render(&originalPixmap);
	if ( originalPixmap.isNull() ) {
		qDebug("\t\tError: QPixmap::grabWidget() returned a NULL QPixmap.");
		exit(EXIT_FAILURE);
	}
    //QString fileName = QDir::currentPath() + "/secondwidget." + format;
    if ( !originalPixmap.save(realPath, "PNG") ) {
		qDebug("\t\tError: QPixmap.save() failed.");
		exit(EXIT_FAILURE);
	}
    qDebug() << "\t\t\t...Screenshot saved in" << realPath;

    widget->close();
}



/*
 * Call this if you just want to pass the ui file name and the output dir.
 */

void createScreenshotFromUiFile(const QString& fileNameUiFile, const QString pathOutputDir)
{
    qDebug() << "\t\tCreating screenshot from widget defined in" << fileNameUiFile;

    QWidget* w = getWidgetFromUiFile(fileNameUiFile);
    makeScreenshot(w, fileNameUiFile, pathOutputDir);
}



/*
 * Start here.
 */

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

    // check for necessary arguments
    if (argc == 1) {
        cout << "Syntax: " << argv[0] << " <path to *.ui file> [output directory]" << endl;
        cout << "" << endl;
        cout << "Takes a *.ui file and an output dir as argument in order to" << endl;
        cout << "create a screenshot of the widget defined in the ui file." << endl;
        cout << "" << endl;
        cout << "The screenshot is saved in the output dir (default current dir)," << endl;
        cout << "'.png' is appended to the ui file name." << endl;
        exit(EXIT_FAILURE);
    }


    // check for *.ui
    QString fileName = app.arguments().value(1);
    if ( !fileName.endsWith(".ui") ) {
        qDebug() << fileName + " is not a *.ui file.";
        exit(EXIT_FAILURE);
    }

    // does the file exist?
    QFile uiFile(fileName);
    if ( !uiFile.exists() ) {
        qDebug() << fileName + " does not exist.";
        exit(EXIT_FAILURE);
    }

    // check output directory
    QString pathOutputDir = QDir::currentPath();

    if (argc >= 3 ) {
        QDir outputDir = app.arguments().value(2);
        if ( outputDir.exists() ) {
            pathOutputDir = outputDir.absolutePath();
        } else {
            qDebug() << outputDir.absolutePath() + " does not exist or is not a directory.";
            exit(EXIT_FAILURE);
        }
    }

    // take the screenshot
    createScreenshotFromUiFile(fileName, pathOutputDir);

    app.quit();
    return 0;
}

#endif