[Lazarus] Showing selection on drawing under Cocoa

[C Western]

On 17/10/2019 03:44, Dmitry Boyarintsev via lazarus wrote:
> On Wed, Oct 16, 2019 at 4:33 PM C Western via lazarus 
> <lazarus at lists.lazarus-ide.org <mailto:lazarus at lists.lazarus-ide.org>> 
> wrote:
>
>     Am I missing something? How does the Cocoa toolkit expect this to
>     be done?
>
> I'm see 3 ways of doing that.
> 1) you just invalidate the needed rectangle lines (or the entire 
> selected area) and do xor drawing  on paint event.

I hadn't thought of that possibility at all - thank you! (It obviously 
requires some work on the paint handler, but this is likely to be the 
most straightforward.)

Colin