General and Desktop

@devman There is no Qt interface for that. Qt (via QPrinter) sends the job to the printer subsystem of the OS and that's it. You can, however, query the state of the printer (see QPrinter documentation!) and thus derive some assumptions. Any other solution would not be platform agnostic, you'll need to interface yourself with the respective printer subsystem.

Can you connect to it via another ODBC client (i.e., one not based on Qt)?

Yes .tif gathered from UAVs depicting land...with georeferencing...

@JonB said in QListWidget drag/drop documentation/behaviour: I don't know how that compares against your ui->listWidget->setDragDropMode(QAbstractItemView::DragOnly) setDragDropMode calls setAcceptDrops so either works

@SPlatten For example: you lay out 5 radio buttons in a group box: 3 are mutually exclusive and the other two are the same. In this case, you need two qbuttongroups for the three and two radio buttons. If all five are mutually exclusive, qbuttongroup is not needed. The buttons in a button group are usually checkable QPushButtons, QCheckBoxes (normally for non-exclusive button groups), or QRadioButtons. https://doc.qt.io/qt-5/qbuttongroup.html#details

@jsulm , I like that idea: QFormLayout* pobjForm(qobject_cast<QFormLayout*>(pobjLayout)); QGridLayout* pobjGrid(qobject_cast<QGridLayout*>(pobjLayout)); QHBoxLayout* pobjHBox(qobject_cast<QHBoxLayout*>(pobjLayout)); QVBoxLayout* pobjVBox(qobject_cast<QVBoxLayout*>(pobjLayout)); Simple and elegant.

Quick dirty example: class BigWidget : public QWidget { void paintEvent(QPaintEvent *event) { QPainter painter(this); auto reg = visibleRegion(); int w=80; QSize s{w,w}; QPoint pv=reg.boundingRect().topLeft(); QRect rv(pv,s); while(reg.intersects(rv)) { painter.drawRect(rv); painter.drawText(rv, Qt::AlignCenter,QString("%1,%2").arg(rv.x()).arg(rv.y())); QPoint ph=pv+QPoint(w,0); QRect rh=QRect(ph,s); while(reg.intersects(rh)) { qDebug()<<rh; painter.drawRect(rh); painter.drawText(rh, Qt::AlignCenter,QString("%1,%2").arg(rh.x()).arg(rh.y())); ph+=QPoint(w,0); rh=QRect(ph,s); } pv+=QPoint(0,w); rv=QRect(pv,s); } } };

i fixe my bug ! i create the object barreCalcul on the function but, the object as sub after and the pointer is not valid. I need to creat the object at out of my class for don't crash.

@jsulm Didn't notice that option. It's a possibility, thanks. I have a bash file scripts that set only 40 variables for each project version. Although, I don't want to have to do that for every project version. e.g. v1.03.51r, v2.0.5b, and so on.. Many thanks @jsulm ...looks like that's as good an option I'm going to find, although I may just create QtCreator launch scripts for each version. e.g. qt_launch_v1.03r.sh qt_launch_v2.0b.sh I appreciate your help!

Update: The font size of the QMenu and the QTabBar do not differ in the main windows constructor. But after waiting for the followup events to be processed these fonts differ in fact. To get the QTabBar having the same font size as the QMenu it doesn't help to just assign the menus font to the it. It is necessary to explicitly assign the pointSize to the font before assigning it to the destination widget (here the QTabBar). Additionally one can get the QFontMetrics::height() for concrete values. I mark this solved. Best Jazzco

You possibly need a compositor (Compton/Picom or the like) for translucency to work. You may also need a window manager even if there is only one window. These can all be launched from your Xsession script.

@orio said in using latest QMAKE binary with old qt ver: i dont realy think i can solve bug in a very old qmake version And you also can't use qmake from one Qt version with another one. But again: try with latest Qt4 version, maybe that one works with the symlinks.

The same way you link any other C++ dynamic library in VS2019. Putting "QT" in front does not make it magically different.

@john_hobbyist said in Trying to send 2 signals to different methods when button clicked and start in parallel: Any ideas? https://doc.qt.io/qt-5/thread-basics.html "Any ideas? Is thread programming the only way ?" - could be. It is not really clear what you are doing. If you have long lasting task and don't want to block main thread, then yes, threads are the way to go.

Okay, got a working (WINDOWS) solution, probably not perfect but oh well. .h file typedef double(*CalcFunction)(double); std::vector<CalcFunction> m_Plugins; void loadPlugins(); .cpp file void ImageMetrics::loadPlugins() { m_Plugins.clear(); QDir directory(QDir::currentPath()); directory.cd(QString("Plugins")); auto path = QDir::cleanPath(directory.path()); SetDllDirectoryA(path.toStdString().c_str()); QStringList plugins = directory.entryList(QStringList() << "*.dll", QDir::Files); foreach(QString plugin, plugins) { QLibrary lib(plugin); CalcFunction calc = (CalcFunction)lib.resolve("calc"); if (calc){ m_Plugins.push_back(calc); qDebug() << m_Plugins.back()(25); } else qDebug() << lib.errorString(); } } PSA if other get stuck and find their way here: Make sure your DLLs match your Qt Creator architecture (I was using 32 bit DLLs with 64 bit Creator. Your DLL functions have to be wrapped in extern "C" __declspec(dllexport) (I didn't have the extern part)

@mchinand Thanks :D

Hi, On macOS you have that option integrated through Sidecar. On Windows, there are several possibilities existing. Do you really want to re-implement that ?

Hi @Pl45m4, thanks for your response. I will play around with it, untill I find how I want it to be. Thanks for your answer.

I was asking for the exact Qt version because of this: https://bugreports.qt.io/browse/QTBUG-97054