We include qwidget.h since we'll be deriving our custom widget from QWidget. Vcr( QWidget *parent = 0, const char *name = 0 ) We'll look at the header file, qt/tools/designer/examples/vcr/vcr.h first. We will combine some QPushButton widgets to form the basis of our custom widget. Coding the Custom WidgetĪ custom widget may consist of one or more standard widgets placed together in a particular combination, or may be written from scratch. The widget will emit signals according to which button is clicked. We will create a VCR style widget comprising four buttons, rewind, play, next and stop. Creating the widget has to be done whether we are creating a simple custom widget or a plugin, but for simple custom widgets the incorporation into Qt Designer is very easy. Firstly we must create a class that defines the widget, and secondly we must incorporate the widget into Qt Designer. There are two stages to creating a custom widget. This approach provides more power and flexibility than the original method and is covered in Creating Custom Widgets with Plugins. Widgets that are incorporated through plugins appear in their true form in Qt Designer, both when laying out the form and in preview mode. The new method involves embedding the widgets in a plugin. We'll explain how to create custom widgets using the original approach in "Simple Custom Widgets". They only appear in their true form at runtime. Widgets incorporated this way appear as flat pixmaps when added to a form in Qt Designer, even in preview mode. The original method involves little more than completing a dialog box. Qt Designer provides two mechanisms for incorporating custom widgets: They may comprise a combination of existing widgets but with additional functionality, slots and signals, or they may be written from scratch, or a mixture of both. Creating Custom WidgetsĬustom widgets are created in code.
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