General and Desktop

@Menre said in QSqlDatabase: QMYSQL driver not loaded: What am I doing wrong?: implement the line below with my code please? so what did you do until now? How did you configure the plugin? Please show use the output (as text, no pictures please)

@Parthasaradhi You will not find MSVC itself in Qt installer as it is not allowed by Microsoft. You need to download MSVC from microsoft and install it. Then install Qt for MSVC using Qt online installer.

Hi and welcome to devnet, This is a known issue: QTBUG-78086. It's fixed and will be part of Qt 5.12.6 and 5.13.2.

Hi, Are you looking to the date in the ISO-8601 format ? If so, I think this overload of toString will be of interest. Hope it helps

Hi SGaist and many thanks for your answer :)

@Chris-Kawa Thanks Chris, I will go for QTreeWidget, it will do the job.

@mrjj Thanks for posting the links.

The problem has been solved. I installed it in / usr / local / bin as root, but it seemed that the owner of the executable file was left as root. If I change the owner to user, I can execute it. The warning remains.

Try this: Here I was adding 4 standardItem in one row starting from column 1. The same I am deleting before clearing the Model. m_qsimAlarmModel is my object of QStandardItemModel. Below code is not tested, some change may required. for (int i = 0; i<m_qsimAlarmModel->rowCount();i++) { QStandardItem *test = nullptr; test = m_qsimAlarmModel->takeItem(i,1); delete test; test = nullptr; test = m_qsimAlarmModel->takeItem(i,2); delete test; test = nullptr; test = m_qsimAlarmModel->takeItem(i,3); delete test; test = nullptr; test = m_qsimAlarmModel->takeItem(i,4); delete test; test = nullptr; }

So when you take a look at this model you will see QVariant TreeItem::data(int column) const { if (column < 0 || column >= m_itemData.size()) return QVariant(); return m_itemData.at(column); } And here is the full description for this class: https://doc.qt.io/qt-5/qtwidgets-itemviews-simpletreemodel-example.html#treeitem-class-definition "Information about the number of columns associated with the item is provided by columnCount(), and the data in each column can be obtained with the data() function"

@Driftwood said in New to Qt - Layout issues: But, alas, I'm a man of my word. Just send me your first name and little John (or Jane) will get it stamped to their birth cert :D For the greater good of that human being to come, I won't hold you to that promise ;-) Just take the time to choose something wisely :-)

@SGaist Possibly yes... I'm back to this & lost again... I think I figured out the last problem without needing it, but now I need it again... Scenario = bezier curve, 4 points, first start, control left, control right, endpoints. Start and end can never cross each other on Z-axis. Control left can not pass end on the Z-axis and control Right can not pass start on z-axis either. Control points are children of start/endpoints. (Hope this make sense...) So what I need to find out is... location of End point while being inside Control Left event. I need to somehow map scenePos() of End point to my Control Left local space.... here is some debuging I was trying to do... (test case, moving right control point towards left Start item) targetPos : QPointF(348,-478) // scenePos() of Start item myPos : QPointF(336,-617) // scenePos() of rightControl scenePos() - already invalid position because we passed the Z location of targetPos item. myLocPos : QPointF(-237,2) This should match other item loc at some point... localPos of rightControl mapFromScene: QPointF(12,139) // mappings mapToItem : QPointF(113,-477) // mappings mapFromItem : QPointF(583,-479) // mappings one of mappings should return a number close to myLocPos but none of them do :- ( Debug code : qDebug() << "oh snap!" << "\n targetPos : " << itemPos << "\n myPos : " << myPos << "\n myLocPos : " << newPos << "local pos of rightControl item" << "\n mapFromScene: " << mapFromScene(itemPos) << "\n mapToItem : " << mapToItem(items[x], itemPos) << "\n mapFromItem : " << mapFromItem(items[x], itemPos); Esentially this : [image: 1e3b77d8-9ab6-40cb-a748-1377ac582d47.png] Top left item, is the myPos/newPos variable newPos being local and myPos being scenePos(), item below is the "Start"

Hi A talented friend of mine - made this library https://forum.qt.io/topic/104100/diagram-schematic-components-library which have many nice features out of the box. Have a look if would fit your requirements or be an option for a base for your own solution. There is also https://doc.qt.io/qt-5/qtwidgets-graphicsview-diagramscene-example.html Which is a mini flow chart-ish app.

@Asperamanca AFAIK, the code is highly optimized for size and speed. So beside the assertations the is no extra safety net - at least for the code I'm aware of. you can always check yourself - the sources are available after all. Regards

@Christian-Ehrlicher thank you!

You should look for mysql libraries, not for ones from windows.