![]() The application consists of one source file, main.cpp and a UI file. It is based on the original Calculator Form example. To demonstrate, we create a simple Calculator Form application. This allows the widgets defined in the form to be used directly from within the scope of the subclass. The Multiple Inheritance Approach: you subclass both the form's base class and the form's user interface object.The Single Inheritance Approach: you subclass the form's base class ( QWidget or QDialog, for example), and include a private instance of the form's user interface object.The Direct Approach: you construct a widget to use as a placeholder for the component, and set up the user interface inside it.Alternatively, you can use it to extend subclasses of standard widgets.Ī compile time processed form can be used in your application with one of the following approaches: The generated code can be included in your application and used directly from it. For more information, see Reacting to Language Changes. A member function called retranslateUi() that handles the translation of the string properties of the form. ![]() A member function called setupUi() to build the widget tree on the parent widget.Pointers to the form's widgets, layouts, layout items, button groups, and actions.The generated code contains the form's user interface object. You create user interface components with Qt Designer and use Qt's integrated build tools, qmake and uic, to generate code for them when the application is built. At runtime, which means that forms are processed by the QUiLoader class that dynamically constructs the widget tree while parsing the XML file.At compile time, which means that forms are converted to C++ code that can be compiled.Qt Designer UI files represent the widget tree of the form in XML format.
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