Layouts are actually easy to understand “I think”. 🙂 A simple explanation of layouts can be found in the QT book “C++ Gui programming with QT 2nd edition“ What you should be aware of regarding layouts and their size policies Most Qt widgets have a size policy. This size policy tells the system how the … Read more
QML is the name of the language (just like C++, which is another language…) QtQuick is a toolkit for QML, allowing to develop graphical interface in QML language (there are other toolkits for QML, some are graphical like Sailfish Silica or BlackBerry Cascade, and some are non-graphical like QBS which is a replacement for QMake/CMake/make…) … Read more
Deleting QObjects is usually safe (i.e. in normal practice; there might be pathological cases I am not aware of atm), if you follow two basic rules: Never delete an object in a slot or method that is called directly or indirectly by a (synchronous, connection type “direct”) signal from the object to be deleted. E.g. … Read more
Qt Creator is Qt’s IDE. You don’t have to use it, but it greatly simplifies Qt development. Qt Designer is a graphical tool that lets you build QWidget GUIs. Qt Quick Designer is similar, but for building QML GUIs. Both are built in to Qt Creator. This is explained in a little more detail over … Read more
Go in the “Project” part on the left of QtCreator and then in the “Run Settings” tab. There is a Arguments line edit where you can put all you need to pass to your app when launching it. For Qt Creator from Qt 5.6 Go in the “Projects part on the left and then in … Read more
With Qt 5 and a C++11 compiler, the idiomatic way to do such things is to give a functor to connect: connect(action1, &QAction::triggered, this, [this]{ onStepIncreased(1); }); connect(action5, &QAction::triggered, this, [this]{ onStepIncreased(5); }); connect(action10, &QAction::triggered, this, [this]{ onStepIncreased(10); }); connect(action25, &QAction::triggered, this, [this]{ onStepIncreased(25); }); connect(action50, &QAction::triggered, this, [this]{ onStepIncreased(50); }); The third argument to … Read more
If you do not need to modify the substring, then you can use QStringRef. The QStringRef class is a read only wrapper around an existing QString that references a substring within the existing string. This gives much better performance than creating a new QString object to contain the sub-string. E.g. QString myString(“This is a string”); … Read more
It seems you need to do combobox->itemData(combobox->currentIndex()) if you want to get the current data of the QComboBox. If you are using your own class derived from QComboBox, you can add a currentData() function.
There is one main difference between their targetted reuse: .pro This is usually called Project File. .pri This is usually called Project Include File. As you can see in their names, the main difference is that .pri files are meant to be include files. That is similar to including modules in programming language to share … Read more
// remove question mark from the title bar setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);