# “Goodbye” example

This is a bare-minimum example egg that shows how one can define their own
custom QT widgets and bind to their methods in a way compatible with qt-light.

It defines an `OurButton` C++ class that is derived from 
[`QPushButton`](https://doc.qt.io/qt-6/qpushbutton.html) with one change:  
It adds a `SayGoodbye()` method that changes the button’s label to “Goodbye”.

We write a wrapper C-function `gb_saygoodbye()` and bind this function into
our `goodbye-widgets` module under the name `gb:saygoodbye`. It is run on the
button (originally labelled “Quit” in the `goodbye.ui` file), so changing its
text to “Goodbye”.