extend funcitionality of Designer widgets

[dexli]

Hi,
sorry maybe I don't make things clear enough.

As far as I understud if I setup a new class which inherit from a widget class I have to write a plugin for designer to use this class in the designer. This is only efficient if you reuse this class serveral times. (not ony onetime)

After I setup a gui with Qt designer, I switch to code editor in order to implement the functionality ( add methods to some of the used widgets ).

And if you have to change the layout all the work is gone because this file is overwritten by the designer. So that seem not to be a good choice to me.

Or, you can perform the inheritance step offline, then use Designer's promotion feature to include your custom widget in the layout. It won't display any custom functionality like signals or slots you might have implemented, but it'll appear in the layout and the generated code will use the correct class.

That sounds like it is what i'm looking for. Can you please tell me where I find a howto about this promotion feature.

Thanks

dexli

[wysota]

Place a base class for your widget on the form and invoke the context menu on it.

[dexli]

Place a base class for your widget on the form and invoke the context menu on it.

Thanks a lot.

How can I mark this thread as solved ?

[stampede]

And if you have to change the layout all the work is gone because this file is overwritten by the designer

Nothing is gone, because designer form is used only to manage layout, not behavior of widgets. If you want to change the layout, you just have to edit .ui file, implementation for the class (.cpp / .h ) is left untouched, only ui_*.h is automatically generated, but I don't think anyone edits this file by hand. Right click and "Promote to..." is what you are looking for.

[wysota]

but I don't think anyone edits this file by hand

Unfortunately lots of people do it.