akkartik/lines.love
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left/right cursor movement, deleting characters

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This commit is contained in:
Kartik K. Agaram 2022-05-16 20:16:27 -07:00
parent 71cb28e474
commit ad17f4b9e4
1 changed files with 51 additions and 6 deletions
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57
main.lua
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@ -28,7 +28,14 @@ local utf8 = require 'utf8'
-- We'll continue to persist them just to keep the option open to continue
-- solving for them. But for now, this is a program to create static drawings
-- once, and read them passively thereafter.
lines = {}
lines = {''}
cursor_line = 1
-- this is a line
-- ^cursor_pos = 1
-- ^cursor_pos = 2
-- ...
-- ^cursor_pos past end of line is 15
cursor_pos = #lines[cursor_line]+1
screenw, screenh, screenflags = 0, 0, nil
@ -152,7 +159,9 @@ function love.draw()
end
-- cursor
love.graphics.setColor(0,0,0)
love.graphics.print('_', 25+text:getWidth()*1.5, y+6) -- drop the cursor down a bit to account for the increased font size
local line_before_cursor = lines[cursor_line]:sub(1, cursor_pos-1)
local text_before_cursor = love.graphics.newText(love.graphics.getFont(), line_before_cursor)
love.graphics.print('_', 25+text_before_cursor:getWidth()*1.5, y+6) -- drop the cursor down a bit to account for the increased font size
end
function love.update(dt)
@ -484,7 +493,14 @@ end
function love.textinput(t)
if love.mouse.isDown('1') then return end
if in_drawing() then return end
lines[#lines] = lines[#lines]..t
local byteoffset
if cursor_pos > 1 then
byteoffset = utf8.offset(lines[cursor_line], cursor_pos-1)
else
byteoffset = 0
end
lines[cursor_line] = string.sub(lines[cursor_line], 1, byteoffset)..t..string.sub(lines[cursor_line], byteoffset+1)
cursor_pos = cursor_pos+1
if filename then
save_to_disk(lines, filename)
end
@ -500,9 +516,38 @@ function keychord_pressed(chord)
elseif type(lines[#lines]) == 'table' then
table.remove(lines) -- we'll add undo soon
else
local byteoffset = utf8.offset(lines[#lines], -1)
if byteoffset then
lines[#lines] = string.sub(lines[#lines], 1, byteoffset-1)
if cursor_pos > 1 then
local byte_start = utf8.offset(lines[cursor_line], cursor_pos-1)
local byte_end = utf8.offset(lines[cursor_line], cursor_pos)
if byte_start then
if byte_end then
lines[cursor_line] = string.sub(lines[cursor_line], 1, byte_start-1)..string.sub(lines[cursor_line], byte_end)
else
lines[cursor_line] = string.sub(lines[cursor_line], 1, byte_start-1)
end
cursor_pos = cursor_pos-1
end
end
end
elseif chord == 'left' then
if cursor_pos > 1 then
cursor_pos = cursor_pos - 1
end
elseif chord == 'right' then
if cursor_pos <= #lines[cursor_line] then
cursor_pos = cursor_pos + 1
end
elseif chord == 'delete' then
if cursor_pos <= #lines[cursor_line] then
local byte_start = utf8.offset(lines[cursor_line], cursor_pos)
local byte_end = utf8.offset(lines[cursor_line], cursor_pos+1)
if byte_start then
if byte_end then
lines[cursor_line] = string.sub(lines[cursor_line], 1, byte_start-1)..string.sub(lines[cursor_line], byte_end)
else
lines[cursor_line] = string.sub(lines[cursor_line], 1, byte_start-1)
end
-- no change to cursor_pos
end
end
elseif chord == 'escape' and love.mouse.isDown('1') then