General and Desktop

@hobbyProgrammer Ok. Good. :) It was my only guess how on earth the points list could become empty. Sometimes Im a lucky guesser :)

@hobbyProgrammer said in connecting context menu won't work: void alterRoom(QPolygonF room); it has a parameter which you did not mention in your connect() call. But since the triggered() signal does not provide such a parameter it will not works anyway. Do it with a lambda: QPolyF poly; connect(alterPoly, &QAction::triggered, [poly, this]() { alterPoly(poly); });

Solved: Derived from QAbstractTableModel + QTableView Create two QTableView, one for cell's data, another for header data. Frozen the first row of the QTableView used for header data, and refresh data in it (100Hz). (Refer to official demo: Frozen Column Example)

@J-Hilk Thank you very much. it works

@jsulm I am not sure whether I have fully understood your question but the toggle for enabling/disabling the dialog close button is handled and called within the dialog class.

@rahi444 I don't claim to understand why you want to do this. However, does the example (teh accepted solution to it) in, say, https://stackoverflow.com/questions/36778577/qstyleditemdelegate-how-to-make-checkbox-button-to-change-its-state-on-click give you what you need? It's using https://doc.qt.io/qt-5/qstyleditemdelegate.html#editorEvent to access the widget's state in an event. Seems a bit low-level to me, but maybe that's what you do....? Otherwise, I know the editor arranges to store the widget's value via editor widget's user property, see https://doc.qt.io/qt-5/qstyleditemdelegate.html#setModelData itself. Can you leverage that without actually calling setModelData()? Finally, https://doc.qt.io/qt-5/qstyleditemdelegate.html#createEditor returns the widget created for doing the editing. Can you put your own slots/call functions on that to recognise when it's edited and retrieve its value directly? If all else fails, what about looking at the source of the setModelData() method you do not want to use in page https://code.woboq.org/qt5/qtbase/src/widgets/itemviews/qstyleditemdelegate.cpp.html ? You can see there what it does (looks pretty simple), and decide what you want to do compared to that, since you don't want to call it yourself for whatever reason.

@Threadcore I think there is no limitation. Add to your image output a background color, like this: // Now create the output image QImage output(maxWidth, maxHeight, QImage::Format_RGB32); output.fill(Qt::white); In my case, this is a good solution.

@mrjj it works! thank you so much. for people watching this: you can change this: QGraphicsEllipseItem*node = qgraphicsitem_cast<QGraphicsEllipseItem*>(item); into this: QGraphicsPolygonItem*node = qgraphicsitem_cast<QGraphicsPolygonItem*>(item); and it will work for a polygon item or into this: QGraphicsPixmapItem*node = qgraphicsitem_cast<QGraphicsPixmapItem*>(item); and it will work for pixmapItems etc. you can change this line into anything to remove all the object that are that type of graphicsItem

Hi @bobby, Afer sql.exec(), you have to add sql.next() to get position of database record. Have a nice day.

@J-Hilk : Sure

@joseph_ho You should use the command prompt from MinGW installation, then the environment will be setup and ready.

@U7Development said in cant delete unused properties from ui_ prefixed headers: tryied to edit ui header To make it clear: this file is generated! Each time it is generated your changes will be lost, so do not edit it! Do as @JKSH suggested.

Also another problem with path.contains that I find is that the contains would use this as check area > https://doc.qt.io/archives/qt-4.8/images/graphicsview-pathitem.png Which means that the shape can be bigger/inaccurate comparing to the selection location... I think I will need to do some math and create another method for path click intersection. Ok I sorta managed to "fix" it... I ended up creating a forward and then reverse path during selection process. So that the path is a closed - precise - shape. This way I can get proper click detection, I still cant compute which path is closer, but at least selection works properly now.

@Christian-Ehrlicher MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); setWindowIcon(QIcon(":/image/logo.ico")); ui->tabWidget->setTabPosition(QTabWidget::West); ui->tabWidget->tabBar()->setStyle(new CustomTabStyle); } I did like this, it works. before, I set this in Ui form，that's wrong. Thank you.

I meant only that class to create your board. Why are you using QGraphicsWidget at all ?

Spaces are rarely a good idea with such a use case.