I’ll make a rash assumption that this is a homogeneous attribute range.  The
method apparently then calls
fillBackgroundRectArray:count:forCharacterRange:color to fill in the
(possibly) disjoint rects covering that range.  If so, then it looks like
that is where I need to test the applicable attributes to see if my custom
attribute background is applicable, or else call inherited.


On 7/23/13 10:05 AM, "Fritz Anderson" <[email protected]> wrote:

> If I understand your need, -[NSLayoutManager
> drawBackgroundForGlyphRange:atPoint:]?
> 
>  ― F
> 
> On 23 Jul 2013, at 9:55 AM, Gordon Apple <[email protected]> wrote:
> 
>> > Ok, so that¹s out.  I could create a custom attribute which would work as I
>> > described, but I¹m not clear on what NSLayoutManager background method(s) I
>> > would need to override to implement this.
>> > 
>> > 
>> > On 7/22/13 7:30 PM, "Ken Thomases" <[email protected]> wrote:
>> > 
>>> >> I don't think you should attempt to use marked text for this purpose.
>>> >> 
>>> >> Your code would not normally control which text is marked.  This is
>>> normally
>>> >> controlled by Cocoa and/or the input method.  The text view implements
>>> the
>>> >> methods of the NSTextInputClient protocol and through those methods, the
>>> >> framework tells it which text should be marked and when the marking
>>> should be
>>> >> cleared.
> 


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