2022-05-18 04:29:08 +01:00
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-- primitives for editing text
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Text = {}
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2022-05-18 06:36:10 +01:00
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local utf8 = require 'utf8'
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2022-05-19 13:44:57 +01:00
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function Text.draw(line, line_index, cursor_line, cursor_pos)
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2022-05-18 04:29:08 +01:00
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love.graphics.setColor(0,0,0)
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local love_text = love.graphics.newText(love.graphics.getFont(), line.data)
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2022-05-19 13:44:57 +01:00
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love.graphics.draw(love_text, 25,line.y, 0, Zoom)
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2022-05-18 04:29:08 +01:00
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if line_index == cursor_line then
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-- cursor
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2022-05-19 13:44:57 +01:00
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love.graphics.print('_', Text.cursor_x(line.data, cursor_pos), line.y+6) -- drop the cursor down a bit to account for the increased font size
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2022-05-18 04:29:08 +01:00
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end
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end
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2022-05-18 06:36:10 +01:00
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function love.textinput(t)
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if love.mouse.isDown('1') then return end
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if Lines[Cursor_line].mode == 'drawing' then return end
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2022-05-19 04:22:57 +01:00
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Text.insert_at_cursor(t)
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save_to_disk(Lines, Filename)
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end
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function Text.insert_at_cursor(t)
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2022-05-18 06:36:10 +01:00
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local byte_offset
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if Cursor_pos > 1 then
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byte_offset = utf8.offset(Lines[Cursor_line].data, Cursor_pos-1)
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else
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byte_offset = 0
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end
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Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_offset)..t..string.sub(Lines[Cursor_line].data, byte_offset+1)
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Cursor_pos = Cursor_pos+1
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end
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-- Don't handle any keys here that would trigger love.textinput above.
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function Text.keychord_pressed(chord)
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if chord == 'return' then
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local byte_offset = utf8.offset(Lines[Cursor_line].data, Cursor_pos)
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table.insert(Lines, Cursor_line+1, {mode='text', data=string.sub(Lines[Cursor_line].data, byte_offset)})
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Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_offset-1)
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Cursor_line = Cursor_line+1
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Cursor_pos = 1
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save_to_disk(Lines, Filename)
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2022-05-19 04:22:57 +01:00
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elseif chord == 'tab' then
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Text.insert_at_cursor('\t')
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save_to_disk(Lines, Filename)
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2022-05-18 06:36:10 +01:00
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elseif chord == 'left' then
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assert(Lines[Cursor_line].mode == 'text')
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if Cursor_pos > 1 then
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Cursor_pos = Cursor_pos-1
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else
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local new_cursor_line = Cursor_line
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while new_cursor_line > 1 do
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new_cursor_line = new_cursor_line-1
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if Lines[new_cursor_line].mode == 'text' then
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Cursor_line = new_cursor_line
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Cursor_pos = #Lines[Cursor_line].data+1
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break
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end
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end
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2022-05-19 01:22:04 +01:00
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if Cursor_line < Screen_top_line then
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Screen_top_line = Cursor_line
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end
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2022-05-18 06:36:10 +01:00
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end
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elseif chord == 'right' then
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assert(Lines[Cursor_line].mode == 'text')
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if Cursor_pos <= #Lines[Cursor_line].data then
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Cursor_pos = Cursor_pos+1
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else
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local new_cursor_line = Cursor_line
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while new_cursor_line <= #Lines-1 do
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new_cursor_line = new_cursor_line+1
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if Lines[new_cursor_line].mode == 'text' then
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Cursor_line = new_cursor_line
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Cursor_pos = 1
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break
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end
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end
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2022-05-19 01:22:04 +01:00
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if Cursor_line > Screen_bottom_line then
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Screen_top_line = Cursor_line
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end
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2022-05-18 06:36:10 +01:00
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end
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elseif chord == 'home' then
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Cursor_pos = 1
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elseif chord == 'end' then
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Cursor_pos = #Lines[Cursor_line].data+1
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elseif chord == 'backspace' then
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if Cursor_pos > 1 then
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local byte_start = utf8.offset(Lines[Cursor_line].data, Cursor_pos-1)
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local byte_end = utf8.offset(Lines[Cursor_line].data, Cursor_pos)
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if byte_start then
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if byte_end then
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Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_start-1)..string.sub(Lines[Cursor_line].data, byte_end)
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else
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Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_start-1)
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end
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Cursor_pos = Cursor_pos-1
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end
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elseif Cursor_line > 1 then
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if Lines[Cursor_line-1].mode == 'drawing' then
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table.remove(Lines, Cursor_line-1)
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else
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-- join lines
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Cursor_pos = utf8.len(Lines[Cursor_line-1].data)+1
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Lines[Cursor_line-1].data = Lines[Cursor_line-1].data..Lines[Cursor_line].data
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table.remove(Lines, Cursor_line)
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end
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Cursor_line = Cursor_line-1
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end
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save_to_disk(Lines, Filename)
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elseif chord == 'delete' then
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if Cursor_pos <= #Lines[Cursor_line].data then
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local byte_start = utf8.offset(Lines[Cursor_line].data, Cursor_pos)
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local byte_end = utf8.offset(Lines[Cursor_line].data, Cursor_pos+1)
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if byte_start then
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if byte_end then
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Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_start-1)..string.sub(Lines[Cursor_line].data, byte_end)
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else
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Lines[Cursor_line].data = string.sub(Lines[Cursor_line].data, 1, byte_start-1)
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end
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-- no change to Cursor_pos
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end
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elseif Cursor_line < #Lines then
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if Lines[Cursor_line+1].mode == 'drawing' then
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table.remove(Lines, Cursor_line+1)
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else
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-- join lines
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Lines[Cursor_line].data = Lines[Cursor_line].data..Lines[Cursor_line+1].data
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table.remove(Lines, Cursor_line+1)
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end
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end
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save_to_disk(Lines, Filename)
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elseif chord == 'up' then
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assert(Lines[Cursor_line].mode == 'text')
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local new_cursor_line = Cursor_line
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while new_cursor_line > 1 do
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new_cursor_line = new_cursor_line-1
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if Lines[new_cursor_line].mode == 'text' then
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local old_x = Text.cursor_x(Lines[new_cursor_line].data, Cursor_pos)
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Cursor_line = new_cursor_line
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Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, old_x, Cursor_pos)
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break
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end
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end
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2022-05-19 01:22:04 +01:00
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if Cursor_line < Screen_top_line then
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Screen_top_line = Cursor_line
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end
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2022-05-18 06:36:10 +01:00
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elseif chord == 'down' then
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assert(Lines[Cursor_line].mode == 'text')
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local new_cursor_line = Cursor_line
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while new_cursor_line < #Lines do
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new_cursor_line = new_cursor_line+1
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if Lines[new_cursor_line].mode == 'text' then
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local old_x = Text.cursor_x(Lines[new_cursor_line].data, Cursor_pos)
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Cursor_line = new_cursor_line
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Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, old_x, Cursor_pos)
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break
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end
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end
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2022-05-19 01:22:04 +01:00
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if Cursor_line > Screen_bottom_line then
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Screen_top_line = Cursor_line
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end
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2022-05-18 06:36:10 +01:00
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end
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end
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2022-05-19 02:19:27 +01:00
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function Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary()
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while Cursor_line <= #Lines do
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if Lines[Cursor_line].mode == 'text' then
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break
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end
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Cursor_line = Cursor_line + 1
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end
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-- hack: insert a text line at bottom of file if necessary
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if Cursor_line > #Lines then
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assert(Cursor_line == #Lines+1)
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table.insert(Lines, {mode='text', data=''})
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end
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if Cursor_line > Screen_bottom_line then
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Screen_top_line = Cursor_line
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Text.scroll_up_while_cursor_on_screen()
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end
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end
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function Text.scroll_up_while_cursor_on_screen()
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local y = Screen_height - 15*Zoom -- for Cursor_line
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while true do
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if Screen_top_line == 1 then break end
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y = y - 15*Zoom
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if Lines[Screen_top_line].mode == 'drawing' then
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y = y - Drawing.pixels(Lines[Screen_top_line].h)
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end
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if y < 15*Zoom then
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break
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end
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Screen_top_line = Screen_top_line - 1
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end
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end
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2022-05-18 06:53:09 +01:00
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function Text.in_line(line, x,y)
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2022-05-19 01:22:04 +01:00
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if line.y == nil then return false end -- outside current page
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2022-05-18 06:53:09 +01:00
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return x >= 16 and y >= line.y and y < line.y+15*Zoom
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end
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2022-05-19 16:17:34 +01:00
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function Text.move_cursor(line_index, line, x)
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2022-05-18 06:53:09 +01:00
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Cursor_line = line_index
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Cursor_pos = Text.nearest_cursor_pos(line.data, x)
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end
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2022-05-18 04:29:08 +01:00
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function Text.nearest_cursor_pos(line, x, hint)
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if x == 0 then
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return 1
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end
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local max_x = Text.cursor_x(line, #line+1)
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if x > max_x then
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return #line+1
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end
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2022-05-18 06:53:09 +01:00
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if hint then
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local currx = Text.cursor_x(line, hint)
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if currx > x-2 and currx < x+2 then
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return hint
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end
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2022-05-18 04:29:08 +01:00
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end
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local left, right = 1, #line+1
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2022-05-18 06:53:09 +01:00
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if hint then
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if currx > x then
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right = hint
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else
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left = hint
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end
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2022-05-18 04:29:08 +01:00
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end
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while left < right-1 do
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local curr = math.floor((left+right)/2)
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local currxmin = Text.cursor_x(line, curr)
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local currxmax = Text.cursor_x(line, curr+1)
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if currxmin <= x and x < currxmax then
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return curr
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end
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if currxmin > x then
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right = curr
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else
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left = curr
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end
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end
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return right
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end
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function Text.cursor_x(line_data, cursor_pos)
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local line_before_cursor = line_data:sub(1, cursor_pos-1)
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local text_before_cursor = love.graphics.newText(love.graphics.getFont(), line_before_cursor)
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return 25+text_before_cursor:getWidth()*Zoom
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end
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return Text
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