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-- primitives for editing text
Text = {}
local utf8 = require 'utf8'
function Text.draw(line, line_index, cursor_line, y, cursor_pos)
love.graphics.setColor(0,0,0)
local love_text = love.graphics.newText(love.graphics.getFont(), line.data)
love.graphics.draw(love_text, 25,y, 0, Zoom)
if line_index == cursor_line then
-- cursor
love.graphics.print('_', Text.cursor_x(line.data, cursor_pos), y+6) -- drop the cursor down a bit to account for the increased font size
end
end
function love.textinput(t)
if love.mouse.isDown('1') then return end
if Lines[Cursor_line].mode == 'drawing' then return end
local byte_offset
if Cursor_pos > 1 then
byte_offset = utf8.offset(Lines[Cursor_line].data, Cursor_pos-1)
else
byte_offset = 0
end
Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_offset)..t..string.sub(Lines[Cursor_line].data, byte_offset+1)
Cursor_pos = Cursor_pos+1
save_to_disk(Lines, Filename)
end
-- Don't handle any keys here that would trigger love.textinput above.
function Text.keychord_pressed(chord)
if chord == 'return' then
local byte_offset = utf8.offset(Lines[Cursor_line].data, Cursor_pos)
table.insert(Lines, Cursor_line+1, {mode='text', data=string.sub(Lines[Cursor_line].data, byte_offset)})
Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_offset-1)
Cursor_line = Cursor_line+1
Cursor_pos = 1
save_to_disk(Lines, Filename)
elseif chord == 'left' then
assert(Lines[Cursor_line].mode == 'text')
if Cursor_pos > 1 then
Cursor_pos = Cursor_pos-1
else
local new_cursor_line = Cursor_line
while new_cursor_line > 1 do
new_cursor_line = new_cursor_line-1
if Lines[new_cursor_line].mode == 'text' then
Cursor_line = new_cursor_line
Cursor_pos = #Lines[Cursor_line].data+1
break
end
end
if Cursor_line < Screen_top_line then
Screen_top_line = Cursor_line
end
end
elseif chord == 'right' then
assert(Lines[Cursor_line].mode == 'text')
if Cursor_pos <= #Lines[Cursor_line].data then
Cursor_pos = Cursor_pos+1
else
local new_cursor_line = Cursor_line
while new_cursor_line <= #Lines-1 do
new_cursor_line = new_cursor_line+1
if Lines[new_cursor_line].mode == 'text' then
Cursor_line = new_cursor_line
Cursor_pos = 1
break
end
end
if Cursor_line > Screen_bottom_line then
Screen_top_line = Cursor_line
end
end
elseif chord == 'home' then
Cursor_pos = 1
elseif chord == 'end' then
Cursor_pos = #Lines[Cursor_line].data+1
elseif chord == 'backspace' then
if Cursor_pos > 1 then
local byte_start = utf8.offset(Lines[Cursor_line].data, Cursor_pos-1)
local byte_end = utf8.offset(Lines[Cursor_line].data, Cursor_pos)
if byte_start then
if byte_end then
Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_start-1)..string.sub(Lines[Cursor_line].data, byte_end)
else
Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_start-1)
end
Cursor_pos = Cursor_pos-1
end
elseif Cursor_line > 1 then
if Lines[Cursor_line-1].mode == 'drawing' then
table.remove(Lines, Cursor_line-1)
else
-- join lines
Cursor_pos = utf8.len(Lines[Cursor_line-1].data)+1
Lines[Cursor_line-1].data = Lines[Cursor_line-1].data..Lines[Cursor_line].data
table.remove(Lines, Cursor_line)
end
Cursor_line = Cursor_line-1
end
save_to_disk(Lines, Filename)
elseif chord == 'delete' then
if Cursor_pos <= #Lines[Cursor_line].data then
local byte_start = utf8.offset(Lines[Cursor_line].data, Cursor_pos)
local byte_end = utf8.offset(Lines[Cursor_line].data, Cursor_pos+1)
if byte_start then
if byte_end then
Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_start-1)..string.sub(Lines[Cursor_line].data, byte_end)
else
Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_start-1)
end
-- no change to Cursor_pos
end
elseif Cursor_line < #Lines then
if Lines[Cursor_line+1].mode == 'drawing' then
table.remove(Lines, Cursor_line+1)
else
-- join lines
Lines[Cursor_line].data = Lines[Cursor_line].data..Lines[Cursor_line+1].data
table.remove(Lines, Cursor_line+1)
end
end
save_to_disk(Lines, Filename)
elseif chord == 'up' then
assert(Lines[Cursor_line].mode == 'text')
local new_cursor_line = Cursor_line
while new_cursor_line > 1 do
new_cursor_line = new_cursor_line-1
if Lines[new_cursor_line].mode == 'text' then
local old_x = Text.cursor_x(Lines[new_cursor_line].data, Cursor_pos)
Cursor_line = new_cursor_line
Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, old_x, Cursor_pos)
break
end
end
if Cursor_line < Screen_top_line then
Screen_top_line = Cursor_line
end
elseif chord == 'down' then
assert(Lines[Cursor_line].mode == 'text')
local new_cursor_line = Cursor_line
while new_cursor_line < #Lines do
new_cursor_line = new_cursor_line+1
if Lines[new_cursor_line].mode == 'text' then
local old_x = Text.cursor_x(Lines[new_cursor_line].data, Cursor_pos)
Cursor_line = new_cursor_line
Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, old_x, Cursor_pos)
break
end
end
if Cursor_line > Screen_bottom_line then
Screen_top_line = Cursor_line
end
end
end
function Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary()
while Cursor_line <= #Lines do
if Lines[Cursor_line].mode == 'text' then
break
end
Cursor_line = Cursor_line + 1
end
-- hack: insert a text line at bottom of file if necessary
if Cursor_line > #Lines then
assert(Cursor_line == #Lines+1)
table.insert(Lines, {mode='text', data=''})
end
if Cursor_line > Screen_bottom_line then
Screen_top_line = Cursor_line
Text.scroll_up_while_cursor_on_screen()
end
end
function Text.scroll_up_while_cursor_on_screen()
local y = Screen_height - 15*Zoom -- for Cursor_line
while true do
if Screen_top_line == 1 then break end
y = y - 15*Zoom
if Lines[Screen_top_line].mode == 'drawing' then
y = y - Drawing.pixels(Lines[Screen_top_line].h)
end
if y < 15*Zoom then
break
end
Screen_top_line = Screen_top_line - 1
end
end
function Text.in_line(line, x,y)
if line.y == nil then return false end -- outside current page
return x >= 16 and y >= line.y and y < line.y+15*Zoom
end
function Text.move_cursor(line_index, line, x, hint)
Cursor_line = line_index
Cursor_pos = Text.nearest_cursor_pos(line.data, x)
end
function Text.nearest_cursor_pos(line, x, hint)
if x == 0 then
return 1
end
local max_x = Text.cursor_x(line, #line+1)
if x > max_x then
return #line+1
end
if hint then
local currx = Text.cursor_x(line, hint)
if currx > x-2 and currx < x+2 then
return hint
end
end
local left, right = 1, #line+1
if hint then
if currx > x then
right = hint
else
left = hint
end
end
while left < right-1 do
local curr = math.floor((left+right)/2)
local currxmin = Text.cursor_x(line, curr)
local currxmax = Text.cursor_x(line, curr+1)
if currxmin <= x and x < currxmax then
return curr
end
if currxmin > x then
right = curr
else
left = curr
end
end
return right
end
function Text.cursor_x(line_data, cursor_pos)
local line_before_cursor = line_data:sub(1, cursor_pos-1)
local text_before_cursor = love.graphics.newText(love.graphics.getFont(), line_before_cursor)
return 25+text_before_cursor:getWidth()*Zoom
end
return Text
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