[Gambas-user] gb.ncurses component would be unusable?

[Benoît Minisini]

Le 20/05/2021 à 13:28, Tobias Boege a écrit :
> On Thu, 20 May 2021, Bruce Steers wrote:
>> On Thu, 20 May 2021 at 11:21, CD <claude.dessere at orange.fr> wrote:
>>
>>> Hello,
>>>
>>> when, in Project/Properties/Component,
>>> I check gb.ncurses, and I launch the execution (in the IDE in design mode) of the program,
>>> I have a message (a balloon that points to native code):
>>> "'Screen.Height' is incorrectly overridden in class 'Screen'"
>>> the program goes into pauses.
>>> If I continue the execution by pressing Play again, message (info):
>>> "The program returned the value: 1"
>>> Click on OK, the program stops.
>>>
>>> Is the NCurses component unusable?
>>>
>> I have made this same mistake.
>>
>> ncurses is CLI only and cannot be used with any sort of GUI application.
>>
> 
> To expand on this: the error you see comes from the fact that you apparently
> have one of the GUI components (gb.gtk*, gb.qt*, gb.gui.*) loaded, which
> provides a class named Screen representing on your computer screen.
> 
> gb.ncurses also exports a class named Screen to represent the terminal of
> the ncurses application.
> 
> These two classes of the same name have incompatible interfaces. This happened
> by bad luck. gb.ncurses is not unusable, but it is not usable together with a
> GUI component. You either pick GUI or TUI.
> 
> The proposed work on namespaces would fix this incompatibility in the future.
> It is not that the two kinds of UI are inherently or by design incompatible,
> but by accident of a class name collision.
> 
> Best,
> Tobias
> 

The symbol clash is logical, as effectively you can't have two GUI 
components, even if one only uses the terminal. So I'm not sure in that 
case you should use a different name of the class.

On the contrary, I think all components should use the same class names 
if they are roughly doing the same thing in a mutually exclusive way.

-- 
Benoît Minisini