There is a bit of a problem I encountered trying to code this up.
I'm not 100% sure yet if it's a bug, though I think it must be. Comments
anyone ?
If I set the 'spacebelow' of the last (Nth) line of a field, and get the
formattedheight of the field, that includes the spacebelow value just set.
However, none of
the formattedheight of line N of fld ...
the formattedheight of line 1 to N of fld ...
the formattedheight of line 1 to -1 of fld ...
include it. The same is true of 'internal' lines - it's not just the
last one in the field - the formattedheight of a chunk doesn't include
any spacebelow set on the last line of the chunk.
This makes it near impossible to use a binary search accurately (or
indeed to reliably use "the formattedheight of chunk xx of fld yy").
So now that I've describe it like that, I'm pretty sure it is a bug ....
but comments welcome before I report it.
-- Alex.
On 28/03/2017 05:30, hh via use-livecode wrote:
The solution of Alex T. was the first example I saw of a useful
usage of the styledText array. TMHO this is the way to go for the
future of more and more complicated styled text.
As was said elsewhere, there could be a considerable speed up if
first the visible range of lines, say numbers L1 to L2, is determined.
We had once a thread in the forum about that. The fastest method:
Compare the formattedHeight of line 1 to L of fld T to the vscroll v0
of fld T. Not by walking with L up from one, but by using a binary
search for L1 and then starting from there to find L2 by comparing to
v0+the height of fld T. This needs only a few millisecs even for large
chunks.
Then use Alex's method with the styledText array of these lines. Or,
quick and dirty, save the selectedChunk, select before each line L
in the range L1 to L1 and collect the selectedLocs and then restore
the selectedChunk.
Now draw the line numbers each into an own freshly created field or
use Alex's space below method.
p.s. Hopefully you will share your final code.
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