Selection with alpha transparency

[Jean-Marc Lasgouttes]

Le 04/08/2020 à 22:19, Daniel a écrit :
> Qt supports color alpha transparency. This can be used, for example, for 
> semi-transparent selection boxes as is used in Libre and MS Office. The 
> attached patch is only a very rough attempt. The screen captures show 
> contrast the result.

Using transparency for selections is an excellent idea. Actually, I have 
had thoughts about using transparency in othe rplaces, but it did not 
occur to me that selections where the best place.

However, the code is currently built to create selections withouth help 
from transparency, which means that the correct patch will not be that 
easy, although it may end up simplifying the code. If we do that, we 
lose the possibility to change (invert) the selected text, though. But 
this is how libreoffice does it.

> The alpha transparency is applied only when "Use system colors" is 
> enabled in Preferences > Color. This leaves it still possible for people 
> to set their own selection color.

I do not think this is the best approach. It will probably be possible 
to apply it everywhere, but we'll see.

> One still unresolved bug of the patch is, for example, that in certain 
> situations certain elements, like pictures and insets start blinking 
> together with the caret. Is the re-painting of certain elements when the 
> caret blinks is on purpose?

Yes, this is what I was hinting at earlier.

JMarc

PS: I will not have time to work on this AFAIK.