General and Desktop

If the signal is not emitted then it's maybe a bug - create a minimal, reproducible example and create a bug report if you're sure it's not a failure on your side. But looks like https://bugreports.qt.io/browse/QTBUG-85830 so no need to create a new bug report then.

@eswaramrth03 As @VRonin has said. Please read the link @nagesh gave you and follow that QStandardItem::setData() pattern to correctly store numbers.

Hi. Please, check my repo. Set Qt App version from git. https://github.com/mrbindraw/TestVersion

Ok, this behaviour only happens when running in debug mode in Qt Creator, when running outside of Qt Creator it does not do this, again, this seems specific to the SDK. This doesn't happen in newer versions of the SDK.

Hi. Please, check my repo. Set Qt App version from git. https://github.com/mrbindraw/TestVersion

You can set the database name with QSqlDatabase::setDatabaseName()

Humor me, will you? constexpr int poolSize = 16; QVector<QThread *> threadPool(poolSize); QCoreApplication * app = QCoreApplication::instance(); for (size_t i = 0; i < poolSize; i++) { QThread * thread = new QThread(app); thread->start(); QObject::connect(thread, &QThread::finished, thread, &QThread::deleteLater); } QObject::connect(app, &QCoreApplication::aboutToQuit, [threadPool] () -> void { for (QThread * thread : threadPool) { thread->quit(); thread->wait(); } }); int index = 0; for (const QString &video : videoFiles) { ThumbnailExtractor *extractor = new ThumbnailExtractor(counter, folderPath + '/' + video); extractor->moveToThread(threadPool[index++ % poolSize]); QObject::connect(extractor, &ThumbnailExtractor::finished, extractor, &QObject::deleteLater); QMetaObject::invokeMethod(extractor, &ThumbnailExtractor::generateThumbnail, Qt::QueuedConnection); } A note here: QMediaPlayer and related classes don't seem to be reentrant so you can't use them from different threads. Stick to the main one.

On what platform are you ? You can't reuse every style on every platform because they contain platform specific code. Also having a macOS style combo box on Linux or Windows would be pretty awkward...

@Tempas Hi There is also https://forum.qt.io/topic/104100/diagram-schematic-components-library

It is late-oclock and I'm lazy so not reading your code, but the general reason people have problems with coordinates is because they forget that coordinates are relative to the parent widget, not global screen coordinates.

Hi You could also just make a custom widget that paint the cells as you want. #ifndef CELLWIDGET_H #define CELLWIDGET_H #include <QPainter> #include <QResizeEvent> #include <QWidget> #include <QDebug> struct Cell { QRect rect; QColor color{Qt::gray}; }; class CellWidget : public QWidget { Q_OBJECT int numCols; int numRows; int cellWidth; int cellHeight; std::vector<Cell>Cells; bool pressed = false; public: explicit CellWidget(QWidget *parent = nullptr, int nCols = 8, int nRows = 8 ) : QWidget(parent), numCols(nCols), numRows(nRows) { } void Layout() // calculate the cells { int y = 0; cellWidth = width() / numCols; cellHeight = height() / numRows; Cells.clear(); Cell tmp; for (int rows = 0; rows < numRows; ++rows) { int x = 0; for (int cols = 0; cols < numCols; ++cols) { //qDebug() << "col=" << cols << "- row=" << rows; tmp.rect.setCoords(x, y, x + cellWidth, y + cellHeight); Cells.push_back(tmp); x += cellWidth; } y += cellHeight; } } signals: protected: virtual void mouseMoveEvent(QMouseEvent *event) override { if (pressed) { for (Cell &cell : Cells) { // find cell under mouse if (cell.rect.contains(event->pos()) ) { cell.color = Qt::yellow; update(); continue; } } } } virtual void paintEvent(QPaintEvent *) override { QPainter p(this); for (const Cell &cell : Cells) { p.setBrush( cell.color); p.drawRect( cell.rect ) ; } } virtual void resizeEvent(QResizeEvent *event) override { Layout(); } virtual void mousePressEvent(QMouseEvent *) override { pressed = true; } virtual void mouseReleaseEvent(QMouseEvent *) override { pressed = false; } }; #endif // CELLWIDGET_H [image: drop4.gif]

@BobDon one solution would be as follows. 1)get the count of files that is being opened simultaneously. 2)If say 6 files are opened, you can set step count as 6*100 = 600 3)Each processing thread should check filesize and report the delta processed in percentage wise. 4)Accumulate the percentage progress reported from each thread and update the value in Progressbar

@RogerBreton Getters and setters are a thing that C++ books recommend. Personally, I don’t strictly follow that rule because it turns the code very verbose. It’s up to you but OOP people will hate you. Sometimes, I just want to read a variable from one class and give it to another. For example: SomeClass1 a; CubeClass b; a.thing=5; b.chocolate=a.thing; Anyway, that’s up to you. In C++, by default, like JonB said, your member functions and member variable are private. Sounds like you want to declare them as public. For structs, by default, they are public. I think what you want to do is to declare an instance of SomeClassName in your MainWindow class. And then, the code becomes SomeClassName TheObject; if (SUCCESSFUL(sdkError)) { TheObject.bWhiteCalibEndFlag = true; }