[Gambas-user] [Gambas Bug Tracker] Bug #753: Rich text editor

[Benoît Minisini]

Le 22/09/2015 18:22, Fabien Bodard a écrit :
> 2015-09-22 18:08 GMT+02:00 Benoît Minisini <gambas at ...1...>:
>> Le 22/09/2015 18:03, Benoît Minisini a écrit :
>>> Le 22/09/2015 17:49, Moviga Technologies a écrit :
>>>>> yes :-)... and maybe with a better synthax. But for that i think you
>>>>> will wait or do it yourself.
>>>>
>>>> (Since you reply by mail, and not in the bugtracker, I reply you also by
>>>> mail)
>>>>
>>>> I am afraid my competence is not enough to undertake such a task. I have
>>>> been trying to look at the gb.form.editor code, and it is a bit hard to
>>>> get a hold on, and there are very few comments explaining what is going
>>>> on.
>>>>
>>>
>>> It won't help you a lot. TextEditor is really made and optimized for
>>> displaying and editing text using a monospace font. Automatic
>>> line-breaking was added recently, and is a sort of hack.
>>>
>>> Making a rich-text editor is a bit like programming something like
>>> LibreOffice Writer, with less features.
>>>
>>> You must have paragraphs, using any font, size, colours, style...
>>> applied to any group of characters in the paragraph.
>>>
>>> Then you need a layouting routine that handle where and how to display
>>> paragraph.
>>>
>>> Then you need to display a cursor, the selected text.
>>>
>>> You need to be able to transform any mouse position in the editor window
>>> into a position in the text.
>>>
>>> You have to implement an undo/redo system.
>>>
>>> Only the rest is similar to what exists in TextEditor: keyboard
>>> handling, shortcuts, saving and loading. It's the simpler.
>>>
>>> Maybe if I have time I will make a library that implement the paragraph
>>> stuff on top of a vectorial canvas (i.e. a sort of DrawingArea that
>>> contains vectorial objects).
>>>
>>> It's interesting to have a "canvas" layer between the paragraphs and the
>>> final ScrollArea. Because after you can "easily" add other objects, like
>>> images, tables, vectorial drawings... until you have a real text processor.
>>>
>>> Interesting project if you have at least six months.
>>>
> 5 years for me
>>
>> And there is (of course) many technical problems like : displaying fonts
>> correctly in all situations when format changes. LibreOffice is now able
>> to do that yet.
>>
>> For example, Gambas paint methods need more feature to be able to
>> displaying text using no hinting whatever how the font system is configured.
>>
>> And you need handle right-to-left languages too!
>>
>> And you need to handle paragraphs having left-to-right and right-to-left
>> languages mixed!
>>
>> ...etc.
> Well i will concentrate my effort on my term :-) for now.
>
> ... and grappe cutting because it's time... 3 weeks of hard work at least.


Good luck! With my family we have just picked almost half a ton of 
apples on just three apple trees. It's time too...

-- 
Benoît Minisini