Re: Elements for inactive additional selections

[email protected]:
 

Is there a way within Scintilla of physically disabling the 
SELECTION_INACTIVE_BACK element? "Just not setting it" lets it pull in the 
OS default.


Elements can be set to nothing with SCI_RESETELEMENTCOLOUR but that is 
unlikely to help here as another element, commonly SELECTION_BACK, will be 
used. If you reset all the potential choices for selection background then 
Scintilla will draw with bugColour (which is magenta) since it *has* to 
clear those otherwise uninitialized pixels to provide a consistent 
appearance.

Please allow me to expand on that.  Setting the Alpha value to 0 does not 
work. Setting the selection inactive back to the Qt::transparent color does 
not work. If I change the selection layer to other than zero the selection 
isn't displayed and the text gets blanked out when clicking on a different 
window.


If you are using SC_LAYER_BASE then the selection is the first thing drawn 
over those pixels: there's nothing behind it so it is drawn opaquely. 
Translucency only works with 

Distinct colours for SELECTION_BACK and SELECTION_SECONDARY_BACK will help 
spot issues with primary selection.

Until more progress is seen, use SC_LAYER_OVER_TEXT in preference 
to SC_LAYER_UNDER_TEXT as that requires multi-phase drawing.

That brings up the next potential issue: what is PHASESDRAW set 
to? SC_PHASES_MULTIPLE is the safest choice and should be used until 
drawing is correct. Once drawing is correct, this may be dialled down 
to SC_PHASES_TWO for performance if needed.

Neil

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