General and Desktop

@Christian-Ehrlicher Thanks :)

[image: 27f27e9f-9fb3-4814-85da-dd71d2032184.png] There seem to be 3 models. Why do you have 3 separate models? What you seem to have is one model, with 2 columns of input data (P & N) and 3 columns of calculated data colored column will be user input and other column have some formula when use enter data so other column should update accordingly if for one table i implement then i understand how to do so i just shared one table picture so i dont understand the implementation of formula . Unless you have some requirement I don't understand, that is what you want.

@JKSH When the system can access the LAN but cannot access the Internet, my http request in LAN will occurred an error "Network access is disabled",and i found call setNetworkAccessible(QNetworkAccessManager::UnknownAccessibility) can solve this problem.

@MohsenNz Still, it shouldn't be so slow. When I was faced with this problem, I am using qml too. As far as I know, using the method mentioned by @JonB in QML, use the item provided by QML, still very slow. Then, I transferred to QWT, which provide the chart component. I used QQuickPaintedItem to paint qwt chart canvas.

FYI After further steps ithe issue was recognised as the bug. Fix: https://bugreports.qt.io/browse/QTBUG-93021

No there's not, but you can easily build one with a QTooBar for example.

Hi, Did you put your QGrouoBox in a layout ?

Hi, Take a look at KDE's set of application: Kate, Krita, Kdevelop and many others.

@Pl45m4 thank you ! with your help i could figure out how the code should be: wCon = new myWindow(this); QMdiSubWindow *cw = new QMdiSubWindow; cw->setWidget(wCon); //destroy window on close cw->setAttribute(Qt::WA_DeleteOnClose); //add window to MDI area ui->mdiArea->addSubWindow(cw); //put window in middle of MDI cw->move(wCon->rect().center()); //show the window cw->show(); this code works well ! thanks !

@N-Sumi @gabor53 Hey, Sorry I get that this is quite old post. But asking incase if you have a solution. I understood how to add this in code and get it. But is there a way to set this property in QtDesigner? So that every time I modify my design, I need not type explicitly in the generated code. I cannot find this property. Could you please let me know if we can do this in Qt designer

https://stackoverflow.com/questions/10369826/how-can-i-disable-alt-f4-window-closing-using-qt

@Selvajothi as I said - you need an instance of serverAuthentication passed to connect QObject::connect(networkaccess, SIGNAL(finished(QNetworkReply*)), __here__, SLOT(getcredential(QNetworkReply*))); ^ //you need a pointer to instance of serverAuthentication Where do you get it from? That's up to you. Also you're still leaking memory and have all the other issues I listed previously. Usually when working with C style libraries you have it organized kinda like this: void init(); // Creates instances of any "global" things you need, e.g. serverAuthentication and QNetworkAccessManager something doSomething(); // Does something with the global instances, like your AuthenticateServer function void shutdown(); // Destroys the global instances

thank you

If you don't have to actually run the deployment from your laptop you can just download the MinGW version of the Qt version you can use and develop/test on that. Unless the software is super low level there shouldn't be any incompatibility due to changing the compiler

@sierdzio said in can anybody explain why QStringList() used in below line ?: sCommand.toLatin1().data() btw: this is useless and even wrong when the command contains non-latin1 characters

QStringListModel has (like every other QAbstractItemModel) the function https://doc.qt.io/qt-5/qstringlistmodel.html#insertRows and https://doc.qt.io/qt-5/qstringlistmodel.html#setData to insert rows and modify the data.

@texas Yeah, I believe the OP is still sitting in front of his computer looking for a solution :)

Exactly 8 months later, I finally managed to make it work the way that I want, so I'm posting the answer. Subclass both QGraphicsView and QGraphicsScene. For both of them mousePressEvent has to be reimplemented as follows: QGraphicsView subclass: void CustomView::mousePressEvent(QMouseEvent* event) { QGraphicsView::mousePressEvent(event); QGraphicsView::mousePressEvent(event); //yes, just call it twice // we're gonna lie to the view that the event is not handled >:) } QGraphicsScene subclass: void CustomScene::mousePressEvent(QGraphicsSceneMouseEvent* event) { if (event->button() != Qt::LeftButton) { event->accept(); return; } QGraphicsItem* item = itemAt(event->scenePos(), QTransform()); if (item != nullptr && !item->isSelected()) { item->setSelected(1); } } Debugging the code, I noticed, the last line - item->setSelected(1) is called on each of the two calls in the CustomView. However on the first call, the item is immediately deselected, since the event is not handled and the GraphicsView starts the rubberband selection, deselecting the item. The second call is where the item is permently selected, since the rubberband already exists. Not a very elegant solution, but it works like a charm. If anyone knows a better way, feel free to share it.