Event and inheritance

[Vincent_MERCEY]

Hi All

I have a super class called myBaseClass which implements an event (say myEvent)
I have different subclasses based on myBaseClass (say subclasses1 and subclasses2)
I have something that must use one of these subclasses whatever it is and need to receive calls from myEvent (with “AddHandler”).
→ it is impossible in subclasses1 or subclasses2 to raise myEvent !
The strange thing is that this event is known outside (for adding addhandler) but not by the derived subclasses.
So my workaround is adding a method in myBaseClass only to raise the event.
It doesn’t look very optimized to me…
Does someone has an other idea ?

[Eric_Williams]

You can only use RaiseEvent from inside a class - you can’t order a class instance to fire an event from the outside. Sounds like you’ve figured that out; is that the answer you’re looking for?

[Vincent_MERCEY]

…from outside, no but from a subclass of the class where the event is declared why not ?
Why events are declared as private and not “protected” ?

[Tim_Parnell]

You can use fancy footwork to achieve that design like this:
ParentEventChild.xojo_xml_project

[Vincent_MERCEY]

yes, that is my workaround.

[Aaron_Hunt]

It’s an issue that has been discussed for a long time …

RaiseEvent problem

I have a subclassed generic Listbox I use a lot, which has an added an Event Definition for “ColumnWidthsChanged”. In my current project, I have subclassed this subclassed Listbox (so I now have a subclass of a subclass). I want to Raise the event ColumnWidthsChanged in a method, so I write: RaiseEvent ColumnWidthsChanged And it doesn’t work. Xojo tells me “This item does not exist”. But it does exist in the parent class (my subclass). If I try to add an Event Definition for ColumnWidthsChang…

[Tim_Hare]

@Vincent_MERCEY

So my workaround is adding a method in myBaseClass only to raise the event.

That is the correct approach.