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capture.love
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speed up some obvious common cases 

This is probably not worth the effort. First sign of trouble, back it out.
This commit is contained in:
Kartik K. Agaram 2022-05-16 21:10:35 -07:00
parent 0da2ec3850
commit c06e744feb
1 changed files with 16 additions and 3 deletions
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19
main.lua
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@ -546,13 +546,13 @@ function keychord_pressed(chord)
if cursor_line > 1 then
local old_x = cursor_x(lines[cursor_line], cursor_pos)
cursor_line = cursor_line-1
cursor_pos = nearest_cursor_pos(lines[cursor_line], old_x)
cursor_pos = nearest_cursor_pos(lines[cursor_line], old_x, cursor_pos)
end
elseif chord == 'down' then
if cursor_line < #lines then
local old_x = cursor_x(lines[cursor_line], cursor_pos)
cursor_line = cursor_line+1
cursor_pos = nearest_cursor_pos(lines[cursor_line], old_x)
cursor_pos = nearest_cursor_pos(lines[cursor_line], old_x, cursor_pos)
end
elseif chord == 'delete' then
if cursor_pos <= #lines[cursor_line] then
@ -712,11 +712,24 @@ function cursor_x(line, cursor_pos)
return text_before_cursor:getWidth()
end
function nearest_cursor_pos(line, x)
function nearest_cursor_pos(line, x, hint)
if x == 0 then
return 1
end
local max_x = cursor_x(line, #line+1)
if x > max_x then
return #line+1
end
local currx = cursor_x(line, hint)
if currx > x-2 and currx < x+2 then
return hint
end
local left, right = 1, #line+1
if currx > x then
right = hint
else
left = hint
end
while left < right-1 do
local curr = math.floor((left+right)/2)
local currx = cursor_x(line, curr)