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|
-- primitives for editing text
Text = {}
local utf8 = require 'utf8'
-- return values:
-- y coordinate drawn until in px
-- position of start of final screen line drawn
function Text.draw(line, line_width, line_index)
--? print('text.draw')
love.graphics.setColor(0,0,0)
-- wrap long lines
local x = 25
local y = line.y
local pos = 1
local screen_line_starting_pos = 1
if line.fragments == nil then
Text.compute_fragments(line, line_width)
end
if line.screen_line_starting_pos == nil then
Text.populate_screen_line_starting_pos(line_index)
end
--? print('--')
for _, f in ipairs(line.fragments) do
local frag, frag_text = f.data, f.text
-- render fragment
local frag_width = math.floor(App.width(frag_text)*Zoom)
--? local s=tostring
--? print('('..s(x)..','..s(y)..') '..frag..'('..s(frag_width)..' vs '..s(line_width)..') '..s(line_index)..' vs '..s(Screen_top1.line)..'; '..s(pos)..' vs '..s(Screen_top1.pos)..'; bottom: '..s(Screen_bottom1.line)..'/'..s(Screen_bottom1.pos))
if x + frag_width > line_width then
assert(x > 25) -- no overfull lines
-- update y only after drawing the first screen line of screen top
if Text.lt1(Screen_top1, {line=line_index, pos=pos}) then
y = y + math.floor(15*Zoom)
if y + math.floor(15*Zoom) > App.screen.height then
--? print('b', y, App.screen.height, '=>', screen_line_starting_pos)
return y, screen_line_starting_pos
end
screen_line_starting_pos = pos
--? print('text: new screen line', y, App.screen.height, screen_line_starting_pos)
end
x = 25
end
--? print('checking to draw', pos, Screen_top1.pos)
-- don't draw text above screen top
if Text.le1(Screen_top1, {line=line_index, pos=pos}) then
--? print('drawing '..frag)
App.screen.draw(frag_text, x,y, 0, Zoom)
end
-- render cursor if necessary
local frag_len = utf8.len(frag)
if line_index == Cursor1.line then
if pos <= Cursor1.pos and pos + frag_len > Cursor1.pos then
Text.draw_cursor(x+Text.x(frag, Cursor1.pos-pos+1), y)
end
end
x = x + frag_width
pos = pos + frag_len
end
if line_index == Cursor1.line and Cursor1.pos == pos then
Text.draw_cursor(x, y)
end
return y, screen_line_starting_pos
end
-- manual tests:
-- draw with small line_width of 100
-- short words break on spaces
-- long words break when they must
function Text.draw_cursor(x, y)
love.graphics.setColor(1,0,0)
love.graphics.circle('fill', x,y+math.floor(15*Zoom), 2)
love.graphics.setColor(0,0,0)
Cursor_x = x
Cursor_y = y+math.floor(15*Zoom)
end
function test_draw_text()
io.write('\ntest_draw_text')
App.screen.init{width=120, height=60}
Lines = load_array{'abc', 'def', 'ghi'}
Line_width = App.screen.width
Cursor1 = {line=1, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
App.draw()
local screen_top_margin = 15 -- pixels
local line_height = 15 -- pixels
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_draw_text/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_draw_text/screen:2')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_draw_text/screen:3')
end
function test_draw_wrapping_text()
io.write('\ntest_draw_wrapping_text')
App.screen.init{width=50, height=60}
Lines = load_array{'abc', 'defgh', 'xyz'}
Line_width = App.screen.width
Cursor1 = {line=1, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
App.draw()
local screen_top_margin = 15 -- pixels
local line_height = 15 -- pixels
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_draw_wrapping_text/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_draw_wrapping_text/screen:2')
y = y + line_height
App.screen.check(y, 'gh', 'F - test_draw_wrapping_text/screen:3')
end
function test_draw_word_wrapping_text()
io.write('\ntest_draw_word_wrapping_text')
App.screen.init{width=60, height=60}
Lines = load_array{'abc def ghi', 'jkl'}
Line_width = App.screen.width
Cursor1 = {line=1, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
App.draw()
local screen_top_margin = 15 -- pixels
local line_height = 15 -- pixels
local y = screen_top_margin
App.screen.check(y, 'abc ', 'F - test_draw_word_wrapping_text/screen:1')
y = y + line_height
App.screen.check(y, 'def ', 'F - test_draw_word_wrapping_text/screen:2')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_draw_word_wrapping_text/screen:3')
end
function test_draw_text_wrapping_within_word()
-- arrange a screen line that needs to be split within a word
io.write('\ntest_draw_text_wrapping_within_word')
App.screen.init{width=60, height=60}
Lines = load_array{'abcd e fghijk', 'xyz'}
Line_width = App.screen.width
Cursor1 = {line=1, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
App.draw()
local screen_top_margin = 15 -- pixels
local line_height = 15 -- pixels
local y = screen_top_margin
App.screen.check(y, 'abcd ', 'F - test_draw_text_wrapping_within_word/screen:1')
y = y + line_height
App.screen.check(y, 'e fghi', 'F - test_draw_text_wrapping_within_word/screen:2')
y = y + line_height
App.screen.check(y, 'jk', 'F - test_draw_text_wrapping_within_word/screen:3')
end
function test_edit_wrapping_text()
io.write('\ntest_edit_wrapping_text')
App.screen.init{width=50, height=60}
Lines = load_array{'abc', 'def', 'xyz'}
Line_width = App.screen.width
Cursor1 = {line=2, pos=4}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
App.run_after_textinput('g')
App.run_after_textinput('h')
App.run_after_textinput('i')
App.run_after_textinput('j')
App.run_after_textinput('k')
App.run_after_textinput('l')
local screen_top_margin = 15 -- pixels
local line_height = 15 -- pixels
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_edit_wrapping_text/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_edit_wrapping_text/screen:2')
y = y + line_height
App.screen.check(y, 'ghij', 'F - test_edit_wrapping_text/screen:3')
end
function test_move_cursor_using_mouse()
io.write('\ntest_move_cursor_using_mouse')
App.screen.init{width=50, height=60}
Lines = load_array{'abc', 'def', 'xyz'}
Line_width = App.screen.width
Cursor1 = {line=1, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
App.draw() -- populate line.y for each line in Lines
local screen_top_margin = 15 -- pixels
local screen_left_margin = 25 -- pixels
App.run_after_mousepress(screen_left_margin+8,screen_top_margin+5, '1')
check_eq(Cursor1.line, 1, 'F - test_move_cursor_using_mouse/cursor:line')
check_eq(Cursor1.pos, 2, 'F - test_move_cursor_using_mouse/cursor:pos')
end
function test_pagedown()
io.write('\ntest_pagedown')
App.screen.init{width=120, height=45}
Lines = load_array{'abc', 'def', 'ghi'}
Line_width = App.screen.width
Cursor1 = {line=1, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
-- initially the first two lines are displayed
App.draw()
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_pagedown/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_pagedown/baseline/screen:2')
-- after pagedown the bottom line becomes the top
App.run_after_keychord('pagedown')
check_eq(Screen_top1.line, 2, 'F - test_pagedown/screen_top')
check_eq(Cursor1.line, 2, 'F - test_pagedown/cursor')
y = screen_top_margin
App.screen.check(y, 'def', 'F - test_pagedown/screen:1')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_pagedown/screen:2')
end
function test_pagedown_skips_drawings()
io.write('\ntest_pagedown_skips_drawings')
-- some lines of text with a drawing intermixed
App.screen.init{width=50, height=80}
Lines = load_array{'abc', -- height 15
'```lines', '```', -- height 25
'def', -- height 15
'ghi'} -- height 15
check_eq(Lines[2].mode, 'drawing', 'F - test_pagedown_skips_drawings/baseline/lines')
Line_width = App.screen.width
Cursor1 = {line=1, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local drawing_height = 20 + App.screen.width / 2 -- default
-- initially the screen displays the first line and the drawing
-- 15px margin + 15px line1 + 10px margin + 25px drawing + 10px margin = 75px < screen height 80px
App.draw()
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_pagedown_skips_drawings/baseline/screen:1')
-- after pagedown the screen draws the drawing up top
-- 15px margin + 10px margin + 25px drawing + 10px margin + 15px line3 = 75px < screen height 80px
App.run_after_keychord('pagedown')
check_eq(Screen_top1.line, 2, 'F - test_pagedown_skips_drawings/screen_top')
check_eq(Cursor1.line, 3, 'F - test_pagedown_skips_drawings/cursor')
y = screen_top_margin + drawing_height
App.screen.check(y, 'def', 'F - test_pagedown_skips_drawings/screen:1')
end
function test_pagedown_shows_one_screen_line_in_common()
io.write('\ntest_pagedown_shows_one_screen_line_in_common')
-- some lines of text with a drawing intermixed
App.screen.init{width=50, height=60}
Lines = load_array{'abc', 'def ghi jkl', 'mno'}
Line_width = App.screen.width
Cursor1 = {line=1, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_pagedown_shows_one_screen_line_in_common/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'def ', 'F - test_pagedown_shows_one_screen_line_in_common/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'ghi ', 'F - test_pagedown_shows_one_screen_line_in_common/baseline/screen:3')
-- after pagedown the bottom screen line becomes the top
App.run_after_keychord('pagedown')
check_eq(Screen_top1.line, 2, 'F - test_pagedown_shows_one_screen_line_in_common/screen_top:line')
check_eq(Screen_top1.pos, 5, 'F - test_pagedown_shows_one_screen_line_in_common/screen_top:pos')
check_eq(Cursor1.line, 2, 'F - test_pagedown_shows_one_screen_line_in_common/cursor:line')
check_eq(Cursor1.pos, 5, 'F - test_pagedown_shows_one_screen_line_in_common/cursor:pos')
y = screen_top_margin
App.screen.check(y, 'ghi ', 'F - test_pagedown_shows_one_screen_line_in_common/screen:1')
y = y + line_height
App.screen.check(y, 'jkl', 'F - test_pagedown_shows_one_screen_line_in_common/screen:2')
y = y + line_height
App.screen.check(y, 'mn', 'F - test_pagedown_shows_one_screen_line_in_common/screen:3')
end
function test_down_arrow_moves_cursor()
io.write('\ntest_down_arrow_moves_cursor')
App.screen.init{width=120, height=60}
Lines = load_array{'abc', 'def', 'ghi', 'jkl'}
Line_width = App.screen.width
Cursor1 = {line=1, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
-- initially the first three lines are displayed
App.draw()
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_down_arrow_moves_cursor/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_down_arrow_moves_cursor/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_down_arrow_moves_cursor/baseline/screen:3')
-- after hitting the down arrow, the cursor moves down by 1 line
App.run_after_keychord('down')
check_eq(Screen_top1.line, 1, 'F - test_down_arrow_moves_cursor/screen_top')
check_eq(Cursor1.line, 2, 'F - test_down_arrow_moves_cursor/cursor')
-- the screen is unchanged
y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_down_arrow_moves_cursor/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_down_arrow_moves_cursor/screen:2')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_down_arrow_moves_cursor/screen:3')
end
function test_down_arrow_scrolls_down_by_one_line()
io.write('\ntest_down_arrow_scrolls_down_by_one_line')
-- display the first three lines with the cursor on the bottom line
App.screen.init{width=120, height=60}
Lines = load_array{'abc', 'def', 'ghi', 'jkl'}
Line_width = App.screen.width
Cursor1 = {line=3, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_down_arrow_scrolls_down_by_one_line/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_down_arrow_scrolls_down_by_one_line/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_down_arrow_scrolls_down_by_one_line/baseline/screen:3')
-- after hitting the down arrow the screen scrolls down by one line
App.run_after_keychord('down')
check_eq(Screen_top1.line, 2, 'F - test_down_arrow_scrolls_down_by_one_line/screen_top')
check_eq(Cursor1.line, 4, 'F - test_down_arrow_scrolls_down_by_one_line/cursor')
y = screen_top_margin
App.screen.check(y, 'def', 'F - test_down_arrow_scrolls_down_by_one_line/screen:1')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_down_arrow_scrolls_down_by_one_line/screen:2')
y = y + line_height
App.screen.check(y, 'jkl', 'F - test_down_arrow_scrolls_down_by_one_line/screen:3')
end
function test_down_arrow_scrolls_down_by_one_screen_line()
io.write('\ntest_down_arrow_scrolls_down_by_one_screen_line')
-- display the first three lines with the cursor on the bottom line
App.screen.init{width=25+30, height=60}
Lines = load_array{'abc', 'def', 'ghi jkl', 'mno'}
Line_width = App.screen.width
Cursor1 = {line=3, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_down_arrow_scrolls_down_by_one_screen_line/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_down_arrow_scrolls_down_by_one_screen_line/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'ghi ', 'F - test_down_arrow_scrolls_down_by_one_screen_line/baseline/screen:3') -- line wrapping includes trailing whitespace
-- after hitting the down arrow the screen scrolls down by one line
App.run_after_keychord('down')
check_eq(Screen_top1.line, 2, 'F - test_down_arrow_scrolls_down_by_one_screen_line/screen_top')
check_eq(Cursor1.line, 3, 'F - test_down_arrow_scrolls_down_by_one_screen_line/cursor:line')
check_eq(Cursor1.pos, 5, 'F - test_down_arrow_scrolls_down_by_one_screen_line/cursor:pos')
y = screen_top_margin
App.screen.check(y, 'def', 'F - test_down_arrow_scrolls_down_by_one_screen_line/screen:1')
y = y + line_height
App.screen.check(y, 'ghi ', 'F - test_down_arrow_scrolls_down_by_one_screen_line/screen:2')
y = y + line_height
App.screen.check(y, 'jkl', 'F - test_down_arrow_scrolls_down_by_one_screen_line/screen:3')
end
function test_down_arrow_scrolls_down_by_one_screen_line_after_splitting_within_word()
io.write('\ntest_down_arrow_scrolls_down_by_one_screen_line_after_splitting_within_word')
-- display the first three lines with the cursor on the bottom line
App.screen.init{width=25+30, height=60}
Lines = load_array{'abc', 'def', 'ghijkl', 'mno'}
Line_width = App.screen.width
Cursor1 = {line=3, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_down_arrow_scrolls_down_by_one_screen_line_after_splitting_within_word/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_down_arrow_scrolls_down_by_one_screen_line_after_splitting_within_word/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'ghijk', 'F - test_down_arrow_scrolls_down_by_one_screen_line_after_splitting_within_word/baseline/screen:3')
-- after hitting the down arrow the screen scrolls down by one line
App.run_after_keychord('down')
check_eq(Screen_top1.line, 2, 'F - test_down_arrow_scrolls_down_by_one_screen_line_after_splitting_within_word/screen_top')
check_eq(Cursor1.line, 3, 'F - test_down_arrow_scrolls_down_by_one_screen_line_after_splitting_within_word/cursor:line')
check_eq(Cursor1.pos, 6, 'F - test_down_arrow_scrolls_down_by_one_screen_line_after_splitting_within_word/cursor:pos')
y = screen_top_margin
App.screen.check(y, 'def', 'F - test_down_arrow_scrolls_down_by_one_screen_line_after_splitting_within_word/screen:1')
y = y + line_height
App.screen.check(y, 'ghijk', 'F - test_down_arrow_scrolls_down_by_one_screen_line_after_splitting_within_word/screen:2')
y = y + line_height
App.screen.check(y, 'l', 'F - test_down_arrow_scrolls_down_by_one_screen_line_after_splitting_within_word/screen:3')
end
function test_page_down_followed_by_down_arrow_does_not_scroll_screen_up()
io.write('\ntest_page_down_followed_by_down_arrow_does_not_scroll_screen_up')
App.screen.init{width=25+30, height=60}
Lines = load_array{'abc', 'def', 'ghijkl', 'mno'}
Line_width = App.screen.width
Cursor1 = {line=3, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_page_down_followed_by_down_arrow_does_not_scroll_screen_up/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_page_down_followed_by_down_arrow_does_not_scroll_screen_up/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'ghijk', 'F - test_page_down_followed_by_down_arrow_does_not_scroll_screen_up/baseline/screen:3')
-- after hitting pagedown the screen scrolls down to start of a long line
App.run_after_keychord('pagedown')
check_eq(Screen_top1.line, 3, 'F - test_page_down_followed_by_down_arrow_does_not_scroll_screen_up/baseline2/screen_top')
check_eq(Cursor1.line, 3, 'F - test_page_down_followed_by_down_arrow_does_not_scroll_screen_up/baseline2/cursor:line')
check_eq(Cursor1.pos, 1, 'F - test_page_down_followed_by_down_arrow_does_not_scroll_screen_up/baseline2/cursor:pos')
-- after hitting down arrow the screen doesn't scroll down further, and certainly doesn't scroll up
App.run_after_keychord('down')
check_eq(Screen_top1.line, 3, 'F - test_page_down_followed_by_down_arrow_does_not_scroll_screen_up/screen_top')
check_eq(Cursor1.line, 3, 'F - test_page_down_followed_by_down_arrow_does_not_scroll_screen_up/cursor:line')
check_eq(Cursor1.pos, 6, 'F - test_page_down_followed_by_down_arrow_does_not_scroll_screen_up/cursor:pos')
y = screen_top_margin
App.screen.check(y, 'ghijk', 'F - test_page_down_followed_by_down_arrow_does_not_scroll_screen_up/screen:1')
y = y + line_height
App.screen.check(y, 'l', 'F - test_page_down_followed_by_down_arrow_does_not_scroll_screen_up/screen:2')
y = y + line_height
App.screen.check(y, 'mno', 'F - test_page_down_followed_by_down_arrow_does_not_scroll_screen_up/screen:3')
end
function test_up_arrow_moves_cursor()
io.write('\ntest_up_arrow_moves_cursor')
-- display the first 3 lines with the cursor on the bottom line
App.screen.init{width=120, height=60}
Lines = load_array{'abc', 'def', 'ghi', 'jkl'}
Line_width = 120
Cursor1 = {line=3, pos=1}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_up_arrow_moves_cursor/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_up_arrow_moves_cursor/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_up_arrow_moves_cursor/baseline/screen:3')
-- after hitting the up arrow the cursor moves up by 1 line
App.run_after_keychord('up')
check_eq(Screen_top1.line, 1, 'F - test_up_arrow_moves_cursor/screen_top')
check_eq(Cursor1.line, 2, 'F - test_up_arrow_moves_cursor/cursor')
-- the screen is unchanged
y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_up_arrow_moves_cursor/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_up_arrow_moves_cursor/screen:2')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_up_arrow_moves_cursor/screen:3')
end
function test_up_arrow_scrolls_up_by_one_line()
io.write('\ntest_up_arrow_scrolls_up_by_one_line')
-- display the lines 2/3/4 with the cursor on line 2
App.screen.init{width=120, height=60}
Lines = load_array{'abc', 'def', 'ghi', 'jkl'}
Line_width = 120
Cursor1 = {line=2, pos=1}
Screen_top1 = {line=2, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'def', 'F - test_up_arrow_scrolls_up_by_one_line/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_up_arrow_scrolls_up_by_one_line/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'jkl', 'F - test_up_arrow_scrolls_up_by_one_line/baseline/screen:3')
-- after hitting the up arrow the screen scrolls up by one line
App.run_after_keychord('up')
check_eq(Screen_top1.line, 1, 'F - test_up_arrow_scrolls_up_by_one_line/screen_top')
check_eq(Cursor1.line, 1, 'F - test_up_arrow_scrolls_up_by_one_line/cursor')
y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_up_arrow_scrolls_up_by_one_line/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_up_arrow_scrolls_up_by_one_line/screen:2')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_up_arrow_scrolls_up_by_one_line/screen:3')
end
function test_up_arrow_scrolls_up_by_one_screen_line()
io.write('\ntest_up_arrow_scrolls_up_by_one_screen_line')
-- display lines starting from second screen line of a line
App.screen.init{width=25+30, height=60}
Lines = load_array{'abc', 'def', 'ghi jkl', 'mno'}
Line_width = App.screen.width
Cursor1 = {line=3, pos=6}
Screen_top1 = {line=3, pos=5}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'jkl', 'F - test_up_arrow_scrolls_up_by_one_screen_line/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'mno', 'F - test_up_arrow_scrolls_up_by_one_screen_line/baseline/screen:2')
-- after hitting the up arrow the screen scrolls up to first screen line
App.run_after_keychord('up')
y = screen_top_margin
App.screen.check(y, 'ghi ', 'F - test_up_arrow_scrolls_up_by_one_screen_line/screen:1')
y = y + line_height
App.screen.check(y, 'jkl', 'F - test_up_arrow_scrolls_up_by_one_screen_line/screen:2')
y = y + line_height
App.screen.check(y, 'mno', 'F - test_up_arrow_scrolls_up_by_one_screen_line/screen:3')
check_eq(Screen_top1.line, 3, 'F - test_up_arrow_scrolls_up_by_one_screen_line/screen_top')
check_eq(Screen_top1.pos, 1, 'F - test_up_arrow_scrolls_up_by_one_screen_line/screen_top')
check_eq(Cursor1.line, 3, 'F - test_up_arrow_scrolls_up_by_one_screen_line/cursor:line')
check_eq(Cursor1.pos, 1, 'F - test_up_arrow_scrolls_up_by_one_screen_line/cursor:pos')
end
function test_up_arrow_scrolls_up_to_final_screen_line()
io.write('\ntest_up_arrow_scrolls_up_to_final_screen_line')
-- display lines starting just after a long line
App.screen.init{width=25+30, height=60}
Lines = load_array{'abc def', 'ghi', 'jkl', 'mno'}
Line_width = App.screen.width
Cursor1 = {line=2, pos=1}
Screen_top1 = {line=2, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'ghi', 'F - test_up_arrow_scrolls_up_to_final_screen_line/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'jkl', 'F - test_up_arrow_scrolls_up_to_final_screen_line/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'mno', 'F - test_up_arrow_scrolls_up_to_final_screen_line/baseline/screen:3')
-- after hitting the up arrow the screen scrolls up to final screen line of previous line
App.run_after_keychord('up')
y = screen_top_margin
App.screen.check(y, 'def', 'F - test_up_arrow_scrolls_up_to_final_screen_line/screen:1')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_up_arrow_scrolls_up_to_final_screen_line/screen:2')
y = y + line_height
App.screen.check(y, 'jkl', 'F - test_up_arrow_scrolls_up_to_final_screen_line/screen:3')
check_eq(Screen_top1.line, 1, 'F - test_up_arrow_scrolls_up_to_final_screen_line/screen_top')
check_eq(Screen_top1.pos, 5, 'F - test_up_arrow_scrolls_up_to_final_screen_line/screen_top')
check_eq(Cursor1.line, 1, 'F - test_up_arrow_scrolls_up_to_final_screen_line/cursor:line')
check_eq(Cursor1.pos, 5, 'F - test_up_arrow_scrolls_up_to_final_screen_line/cursor:pos')
end
function test_up_arrow_scrolls_up_to_empty_line()
io.write('\ntest_up_arrow_scrolls_up_to_empty_line')
-- display a screenful of text with an empty line just above it outside the screen
App.screen.init{width=120, height=60}
Lines = load_array{'', 'abc', 'def', 'ghi', 'jkl'}
Line_width = 120
Cursor1 = {line=2, pos=1}
Screen_top1 = {line=2, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_up_arrow_scrolls_up_to_empty_line/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_up_arrow_scrolls_up_to_empty_line/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_up_arrow_scrolls_up_to_empty_line/baseline/screen:3')
-- after hitting the up arrow the screen scrolls up by one line
App.run_after_keychord('up')
check_eq(Screen_top1.line, 1, 'F - test_up_arrow_scrolls_up_to_empty_line/screen_top')
check_eq(Cursor1.line, 1, 'F - test_up_arrow_scrolls_up_to_empty_line/cursor')
y = screen_top_margin
-- empty first line
y = y + line_height
App.screen.check(y, 'abc', 'F - test_up_arrow_scrolls_up_to_empty_line/screen:2')
y = y + line_height
App.screen.check(y, 'def', 'F - test_up_arrow_scrolls_up_to_empty_line/screen:3')
end
function test_pageup()
io.write('\ntest_pageup')
App.screen.init{width=120, height=45}
Lines = load_array{'abc', 'def', 'ghi'}
Line_width = App.screen.width
Cursor1 = {line=2, pos=1}
Screen_top1 = {line=2, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
-- initially the last two lines are displayed
App.draw()
local y = screen_top_margin
App.screen.check(y, 'def', 'F - test_pageup/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_pageup/baseline/screen:2')
-- after pageup the cursor goes to first line
App.run_after_keychord('pageup')
check_eq(Screen_top1.line, 1, 'F - test_pageup/screen_top')
check_eq(Cursor1.line, 1, 'F - test_pageup/cursor')
y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_pageup/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_pageup/screen:2')
end
function test_pageup_scrolls_up_by_screen_line()
io.write('\ntest_pageup_scrolls_up_by_screen_line')
-- display the first three lines with the cursor on the bottom line
App.screen.init{width=25+30, height=60}
Lines = load_array{'abc def', 'ghi', 'jkl', 'mno'}
Line_width = App.screen.width
Cursor1 = {line=2, pos=1}
Screen_top1 = {line=2, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'ghi', 'F - test_pageup_scrolls_up_by_screen_line/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'jkl', 'F - test_pageup_scrolls_up_by_screen_line/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'mno', 'F - test_pageup_scrolls_up_by_screen_line/baseline/screen:3') -- line wrapping includes trailing whitespace
-- after hitting the page-up key the screen scrolls up to top
App.run_after_keychord('pageup')
check_eq(Screen_top1.line, 1, 'F - test_pageup_scrolls_up_by_screen_line/screen_top')
check_eq(Cursor1.line, 1, 'F - test_pageup_scrolls_up_by_screen_line/cursor:line')
check_eq(Cursor1.pos, 1, 'F - test_pageup_scrolls_up_by_screen_line/cursor:pos')
y = screen_top_margin
App.screen.check(y, 'abc ', 'F - test_pageup_scrolls_up_by_screen_line/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_pageup_scrolls_up_by_screen_line/screen:2')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_pageup_scrolls_up_by_screen_line/screen:3')
end
function test_pageup_scrolls_up_from_middle_screen_line()
io.write('\ntest_pageup_scrolls_up_from_middle_screen_line')
-- display a few lines starting from the middle of a line (Cursor1.pos > 1)
App.screen.init{width=25+30, height=60}
Lines = load_array{'abc def', 'ghi jkl', 'mno'}
Line_width = App.screen.width
Cursor1 = {line=2, pos=5}
Screen_top1 = {line=2, pos=5}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'jkl', 'F - test_pageup_scrolls_up_from_middle_screen_line/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'mno', 'F - test_pageup_scrolls_up_from_middle_screen_line/baseline/screen:3') -- line wrapping includes trailing whitespace
-- after hitting the page-up key the screen scrolls up to top
App.run_after_keychord('pageup')
check_eq(Screen_top1.line, 1, 'F - test_pageup_scrolls_up_from_middle_screen_line/screen_top')
check_eq(Cursor1.line, 1, 'F - test_pageup_scrolls_up_from_middle_screen_line/cursor:line')
check_eq(Cursor1.pos, 1, 'F - test_pageup_scrolls_up_from_middle_screen_line/cursor:pos')
y = screen_top_margin
App.screen.check(y, 'abc ', 'F - test_pageup_scrolls_up_from_middle_screen_line/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_pageup_scrolls_up_from_middle_screen_line/screen:2')
y = y + line_height
App.screen.check(y, 'ghi ', 'F - test_pageup_scrolls_up_from_middle_screen_line/screen:3')
end
function test_enter_on_bottom_line_scrolls_down()
io.write('\ntest_enter_on_bottom_line_scrolls_down')
-- display a few lines with cursor on bottom line
App.screen.init{width=25+30, height=60}
Lines = load_array{'abc', 'def', 'ghi', 'jkl'}
Line_width = App.screen.width
Cursor1 = {line=3, pos=2}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'abc', 'F - test_enter_on_bottom_line_scrolls_down/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'def', 'F - test_enter_on_bottom_line_scrolls_down/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_enter_on_bottom_line_scrolls_down/baseline/screen:3')
-- after hitting the enter key the screen scrolls down
App.run_after_keychord('return')
check_eq(Screen_top1.line, 2, 'F - test_enter_on_bottom_line_scrolls_down/screen_top')
check_eq(Cursor1.line, 4, 'F - test_enter_on_bottom_line_scrolls_down/cursor:line')
check_eq(Cursor1.pos, 1, 'F - test_enter_on_bottom_line_scrolls_down/cursor:pos')
y = screen_top_margin
App.screen.check(y, 'def', 'F - test_enter_on_bottom_line_scrolls_down/screen:1')
y = y + line_height
App.screen.check(y, 'g', 'F - test_enter_on_bottom_line_scrolls_down/screen:2')
y = y + line_height
App.screen.check(y, 'hi', 'F - test_enter_on_bottom_line_scrolls_down/screen:3')
end
function test_position_cursor_on_recently_edited_wrapping_line()
-- draw a line wrapping over 2 screen lines
io.write('\ntest_position_cursor_on_recently_edited_wrapping_line')
App.screen.init{width=120, height=200}
Lines = load_array{'abc def ghi jkl mno pqr ', 'xyz'}
Line_width = 100
Cursor1 = {line=1, pos=25}
Screen_top1 = {line=1, pos=1}
Screen_bottom1 = {}
Zoom = 1
App.draw()
local screen_top_margin = 15 -- pixels
local line_height = 15 -- pixels
local y = screen_top_margin
-- I don't understand why 120px fits so much on a fake screen, but whatever..
App.screen.check(y, 'abc def ghi ', 'F - test_position_cursor_on_recently_edited_wrapping_line/baseline1/screen:1')
y = y + line_height
App.screen.check(y, 'jkl mno pqr ', 'F - test_position_cursor_on_recently_edited_wrapping_line/baseline1/screen:2')
y = y + line_height
App.screen.check(y, 'xyz', 'F - test_position_cursor_on_recently_edited_wrapping_line/baseline1/screen:3')
-- add to the line until it's wrapping over 3 screen lines
App.run_after_textinput('s')
App.run_after_textinput('t')
App.run_after_textinput('u')
check_eq(Cursor1.pos, 28, 'F - test_move_cursor_using_mouse/cursor:pos')
y = screen_top_margin
App.screen.check(y, 'abc def ghi ', 'F - test_position_cursor_on_recently_edited_wrapping_line/baseline2/screen:1')
y = y + line_height
App.screen.check(y, 'jkl mno pqr ', 'F - test_position_cursor_on_recently_edited_wrapping_line/baseline2/screen:2')
y = y + line_height
App.screen.check(y, 'stu', 'F - test_position_cursor_on_recently_edited_wrapping_line/baseline2/screen:3')
-- try to move the cursor earlier in the third screen line by clicking the mouse
local screen_top_margin = 15 -- pixels
local screen_left_margin = 25 -- pixels
App.run_after_mousepress(screen_left_margin+8,screen_top_margin+15*2+5, '1')
-- cursor should move
check_eq(Cursor1.line, 1, 'F - test_move_cursor_using_mouse/cursor:line')
check_eq(Cursor1.pos, 26, 'F - test_move_cursor_using_mouse/cursor:pos')
end
function test_backspace_can_scroll_up()
io.write('\ntest_backspace_can_scroll_up')
-- display the lines 2/3/4 with the cursor on line 2
App.screen.init{width=120, height=60}
Lines = load_array{'abc', 'def', 'ghi', 'jkl'}
Line_width = 120
Cursor1 = {line=2, pos=1}
Screen_top1 = {line=2, pos=1}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'def', 'F - test_backspace_can_scroll_up/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_backspace_can_scroll_up/baseline/screen:2')
y = y + line_height
App.screen.check(y, 'jkl', 'F - test_backspace_can_scroll_up/baseline/screen:3')
-- after hitting backspace the screen scrolls up by one line
App.run_after_keychord('backspace')
check_eq(Screen_top1.line, 1, 'F - test_backspace_can_scroll_up/screen_top')
check_eq(Cursor1.line, 1, 'F - test_backspace_can_scroll_up/cursor')
y = screen_top_margin
App.screen.check(y, 'abcdef', 'F - test_backspace_can_scroll_up/screen:1')
y = y + line_height
App.screen.check(y, 'ghi', 'F - test_backspace_can_scroll_up/screen:2')
y = y + line_height
App.screen.check(y, 'jkl', 'F - test_backspace_can_scroll_up/screen:3')
end
function test_backspace_can_scroll_up_screen_line()
io.write('\ntest_backspace_can_scroll_up_screen_line')
-- display lines starting from second screen line of a line
App.screen.init{width=25+30, height=60}
Lines = load_array{'abc', 'def', 'ghi jkl', 'mno'}
Line_width = App.screen.width
Cursor1 = {line=3, pos=5}
Screen_top1 = {line=3, pos=5}
Screen_bottom1 = {}
Zoom = 1
local screen_top_margin = 15 -- pixels
local line_height = math.floor(15*Zoom) -- pixels
App.draw()
local y = screen_top_margin
App.screen.check(y, 'jkl', 'F - test_backspace_can_scroll_up_screen_line/baseline/screen:1')
y = y + line_height
App.screen.check(y, 'mno', 'F - test_backspace_can_scroll_up_screen_line/baseline/screen:2')
-- after hitting backspace the screen scrolls up by one screen line
App.run_after_keychord('backspace')
y = screen_top_margin
App.screen.check(y, 'ghijk', 'F - test_backspace_can_scroll_up_screen_line/screen:1')
y = y + line_height
App.screen.check(y, 'l', 'F - test_backspace_can_scroll_up_screen_line/screen:2')
y = y + line_height
App.screen.check(y, 'mno', 'F - test_backspace_can_scroll_up_screen_line/screen:3')
check_eq(Screen_top1.line, 3, 'F - test_backspace_can_scroll_up_screen_line/screen_top')
check_eq(Screen_top1.pos, 1, 'F - test_backspace_can_scroll_up_screen_line/screen_top')
check_eq(Cursor1.line, 3, 'F - test_backspace_can_scroll_up_screen_line/cursor:line')
check_eq(Cursor1.pos, 4, 'F - test_backspace_can_scroll_up_screen_line/cursor:pos')
end
function Text.compute_fragments(line, line_width)
--? print('compute_fragments', line_width)
line.fragments = {}
local x = 25
-- try to wrap at word boundaries
for frag in line.data:gmatch('%S*%s*') do
local frag_text = App.newText(love.graphics.getFont(), frag)
local frag_width = math.floor(App.width(frag_text)*Zoom)
--? print('x: '..tostring(x)..'; '..tostring(line_width-x)..'px to go')
--? print('frag: ^'..frag..'$ is '..tostring(frag_width)..'px wide')
if x + frag_width > line_width then
while x + frag_width > line_width do
--? print(x, frag, frag_width, line_width)
if x < 0.8*line_width then
--? print(frag, x, frag_width, line_width)
-- long word; chop it at some letter
-- We're not going to reimplement TeX here.
local b = Text.nearest_pos_less_than(frag, line_width - x)
assert(b > 0) -- avoid infinite loop when window is too narrow
--? print('space for '..tostring(b)..' graphemes')
local frag1 = string.sub(frag, 1, b)
local frag1_text = App.newText(love.graphics.getFont(), frag1)
local frag1_width = math.floor(App.width(frag1_text)*Zoom)
--? print(frag, x, frag1_width, line_width)
assert(x + frag1_width <= line_width)
--? print('inserting '..frag1..' of width '..tostring(frag1_width)..'px')
table.insert(line.fragments, {data=frag1, text=frag1_text})
frag = string.sub(frag, b+1)
frag_text = App.newText(love.graphics.getFont(), frag)
frag_width = math.floor(App.width(frag_text)*Zoom)
end
x = 25 -- new line
end
end
if #frag > 0 then
--? print('inserting '..frag..' of width '..tostring(frag_width)..'px')
table.insert(line.fragments, {data=frag, text=frag_text})
end
x = x + frag_width
end
end
function Text.textinput(t)
if love.mouse.isDown('1') then return end
if App.modifier_down() then return end
local down = love.keyboard.isDown
Text.insert_at_cursor(t)
end
function Text.insert_at_cursor(t)
if Selection1.line then Text.delete_selection() end
local byte_offset
if Cursor1.pos > 1 then
byte_offset = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos)
else
byte_offset = 1
end
Lines[Cursor1.line].data = string.sub(Lines[Cursor1.line].data, 1, byte_offset-1)..t..string.sub(Lines[Cursor1.line].data, byte_offset)
Lines[Cursor1.line].fragments = nil
Lines[Cursor1.line].screen_line_starting_pos = nil
Cursor1.pos = Cursor1.pos+1
end
-- Don't handle any keys here that would trigger love.textinput above.
function Text.keychord_pressed(chord)
--== shortcuts that mutate text
if chord == 'return' then
local byte_offset = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos)
table.insert(Lines, Cursor1.line+1, {mode='text', data=string.sub(Lines[Cursor1.line].data, byte_offset)})
Lines[Cursor1.line].data = string.sub(Lines[Cursor1.line].data, 1, byte_offset-1)
Lines[Cursor1.line].fragments = nil
Cursor1.line = Cursor1.line+1
Cursor1.pos = 1
save_to_disk(Lines, Filename)
if Cursor1.line > Screen_bottom1.line then
Screen_top1.line = Cursor1.line
Text.scroll_up_while_cursor_on_screen()
end
elseif chord == 'tab' then
Text.insert_at_cursor('\t')
save_to_disk(Lines, Filename)
elseif chord == 'backspace' then
if Cursor1.pos > 1 then
local byte_start = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos-1)
local byte_end = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos)
if byte_start then
if byte_end then
Lines[Cursor1.line].data = string.sub(Lines[Cursor1.line].data, 1, byte_start-1)..string.sub(Lines[Cursor1.line].data, byte_end)
else
Lines[Cursor1.line].data = string.sub(Lines[Cursor1.line].data, 1, byte_start-1)
end
Lines[Cursor1.line].fragments = nil
Cursor1.pos = Cursor1.pos-1
end
elseif Cursor1.line > 1 then
if Lines[Cursor1.line-1].mode == 'drawing' then
table.remove(Lines, Cursor1.line-1)
else
-- join lines
Cursor1.pos = utf8.len(Lines[Cursor1.line-1].data)+1
Lines[Cursor1.line-1].data = Lines[Cursor1.line-1].data..Lines[Cursor1.line].data
Lines[Cursor1.line-1].fragments = nil
table.remove(Lines, Cursor1.line)
end
Cursor1.line = Cursor1.line-1
end
if Text.lt1(Cursor1, Screen_top1) then
local top2 = Text.to2(Screen_top1)
top2 = Text.previous_screen_line(top2)
Screen_top1 = Text.to1(top2)
end
assert(Text.le1(Screen_top1, Cursor1))
save_to_disk(Lines, Filename)
elseif chord == 'delete' then
if Cursor1.pos <= utf8.len(Lines[Cursor1.line].data) then
local byte_start = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos)
local byte_end = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos+1)
if byte_start then
if byte_end then
Lines[Cursor1.line].data = string.sub(Lines[Cursor1.line].data, 1, byte_start-1)..string.sub(Lines[Cursor1.line].data, byte_end)
else
Lines[Cursor1.line].data = string.sub(Lines[Cursor1.line].data, 1, byte_start-1)
end
Lines[Cursor1.line].fragments = nil
-- no change to Cursor1.pos
end
elseif Cursor1.line < #Lines then
if Lines[Cursor1.line+1].mode == 'drawing' then
table.remove(Lines, Cursor1.line+1)
else
-- join lines
Lines[Cursor1.line].data = Lines[Cursor1.line].data..Lines[Cursor1.line+1].data
Lines[Cursor1.line].fragments = nil
table.remove(Lines, Cursor1.line+1)
end
end
save_to_disk(Lines, Filename)
-- paste
elseif chord == 'M-v' then
local s = love.system.getClipboardText()
for _,code in utf8.codes(s) do
Text.insert_at_cursor(utf8.char(code))
end
--== shortcuts that move the cursor
elseif chord == 'left' then
Text.left()
elseif chord == 'right' then
Text.right()
-- C- hotkeys reserved for drawings, so we'll use M-
elseif chord == 'M-left' then
Text.word_left()
elseif chord == 'M-right' then
Text.word_right()
elseif chord == 'home' then
Cursor1.pos = 1
elseif chord == 'end' then
Cursor1.pos = utf8.len(Lines[Cursor1.line].data) + 1
elseif chord == 'up' then
Text.up()
elseif chord == 'down' then
Text.down()
elseif chord == 'pageup' then
Text.pageup()
elseif chord == 'pagedown' then
Text.pagedown()
end
end
function Text.pageup()
-- duplicate some logic from love.draw
local top2 = Text.to2(Screen_top1)
--? print(App.screen.height)
local y = App.screen.height - math.floor(15*Zoom)
while y >= 15 do
--? print(y, top2.line)
if Screen_top1.line == 1 and Screen_top1.pos == 1 then break end
if Lines[Screen_top1.line].mode == 'text' then
y = y - math.floor(15*Zoom)
elseif Lines[Screen_top1.line].mode == 'drawing' then
y = y - 20 - Drawing.pixels(Lines[Screen_top1.line].h)
end
top2 = Text.previous_screen_line(top2)
end
Screen_top1 = Text.to1(top2)
Cursor1.line = Screen_top1.line
Cursor1.pos = Screen_top1.pos
Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary()
--? print(Cursor1.line, Cursor1.pos, Screen_top1.line, Screen_top1.pos)
end
function Text.pagedown()
Screen_top1.line = Screen_bottom1.line
Screen_top1.pos = Screen_bottom1.pos
--? print('setting top to', Screen_top1.line, Screen_top1.pos)
Cursor1.line = Screen_top1.line
Cursor1.pos = Screen_top1.pos
Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary()
--? print('top now', Screen_top1.line)
end
function Text.up()
assert(Lines[Cursor1.line].mode == 'text')
--? print('up', Cursor1.pos, Screen_top1.pos)
local screen_line_index,screen_line_starting_pos = Text.pos_at_start_of_cursor_screen_line()
if screen_line_starting_pos == 1 then
--? print('cursor is at first screen line of its line')
-- line is done; skip to previous text line
local new_cursor_line = Cursor1.line
while new_cursor_line > 1 do
new_cursor_line = new_cursor_line-1
if Lines[new_cursor_line].mode == 'text' then
--? print('found previous text line')
Cursor1.line = new_cursor_line
Text.populate_screen_line_starting_pos(Cursor1.line)
if Lines[Cursor1.line].screen_line_starting_pos == nil then
Cursor1.pos = Text.nearest_cursor_pos(Lines[Cursor1.line].data, Cursor_x)
break
end
-- previous text line found, pick its final screen line
--? print('has multiple screen lines')
local screen_line_starting_pos = Lines[Cursor1.line].screen_line_starting_pos
--? print(#screen_line_starting_pos)
screen_line_starting_pos = screen_line_starting_pos[#screen_line_starting_pos]
--? print('previous screen line starts at pos '..tostring(screen_line_starting_pos)..' of its line')
if Screen_top1.line > Cursor1.line then
Screen_top1.line = Cursor1.line
Screen_top1.pos = screen_line_starting_pos
--? print('pos of top of screen is also '..tostring(Screen_top1.pos)..' of the same line')
end
local s = string.sub(Lines[Cursor1.line].data, screen_line_starting_pos)
Cursor1.pos = screen_line_starting_pos + Text.nearest_cursor_pos(s, Cursor_x) - 1
break
end
end
if Cursor1.line < Screen_top1.line then
Screen_top1.line = Cursor1.line
end
else
-- move up one screen line in current line
--? print('cursor is NOT at first screen line of its line')
assert(screen_line_index > 1)
new_screen_line_starting_pos = Lines[Cursor1.line].screen_line_starting_pos[screen_line_index-1]
--? print('switching pos of screen line at cursor from '..tostring(screen_line_starting_pos)..' to '..tostring(new_screen_line_starting_pos))
if Screen_top1.line == Cursor1.line and Screen_top1.pos == screen_line_starting_pos then
Screen_top1.pos = new_screen_line_starting_pos
--? print('also setting pos of top of screen to '..tostring(Screen_top1.pos))
end
local s = string.sub(Lines[Cursor1.line].data, new_screen_line_starting_pos)
Cursor1.pos = new_screen_line_starting_pos + Text.nearest_cursor_pos(s, Cursor_x) - 1
--? print('cursor pos is now '..tostring(Cursor1.pos))
end
end
function Text.down()
assert(Lines[Cursor1.line].mode == 'text')
--? print('down', Cursor1.line, Cursor1.pos, Screen_top1.line, Screen_top1.pos, Screen_bottom1.line, Screen_bottom1.pos)
if Text.cursor_at_final_screen_line() then
-- line is done, skip to next text line
--? print('cursor at final screen line of its line')
local new_cursor_line = Cursor1.line
while new_cursor_line < #Lines do
new_cursor_line = new_cursor_line+1
if Lines[new_cursor_line].mode == 'text' then
Cursor1.line = new_cursor_line
Cursor1.pos = Text.nearest_cursor_pos(Lines[Cursor1.line].data, Cursor_x)
--? print(Cursor1.pos)
break
end
end
if Cursor1.line > Screen_bottom1.line then
--? print('screen top before:', Screen_top1.line, Screen_top1.pos)
Screen_top1.line = Cursor1.line
--? print('scroll up preserving cursor')
Text.scroll_up_while_cursor_on_screen()
--? print('screen top after:', Screen_top1.line, Screen_top1.pos)
end
else
-- move down one screen line in current line
local scroll_up = false
if Text.le1(Screen_bottom1, Cursor1) then
scroll_up = true
end
--? print('cursor is NOT at final screen line of its line')
local screen_line_index, screen_line_starting_pos = Text.pos_at_start_of_cursor_screen_line()
new_screen_line_starting_pos = Lines[Cursor1.line].screen_line_starting_pos[screen_line_index+1]
--? print('switching pos of screen line at cursor from '..tostring(screen_line_starting_pos)..' to '..tostring(new_screen_line_starting_pos))
local s = string.sub(Lines[Cursor1.line].data, new_screen_line_starting_pos)
Cursor1.pos = new_screen_line_starting_pos + Text.nearest_cursor_pos(s, Cursor_x) - 1
--? print('cursor pos is now', Cursor1.line, Cursor1.pos)
if scroll_up then
Screen_top1.line = Cursor1.line
--? print('scroll up preserving cursor')
Text.scroll_up_while_cursor_on_screen()
--? print('screen top after:', Screen_top1.line, Screen_top1.pos)
end
end
--? print('=>', Cursor1.line, Cursor1.pos, Screen_top1.line, Screen_top1.pos, Screen_bottom1.line, Screen_bottom1.pos)
end
function Text.word_left()
while true do
Text.left()
if Cursor1.pos == 1 then break end
assert(Cursor1.pos > 1)
local offset = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos)
assert(offset > 1)
if Lines[Cursor1.line].data:sub(offset-1,offset-1) == ' ' then
break
end
end
end
function Text.word_right()
while true do
Text.right()
if Cursor1.pos > utf8.len(Lines[Cursor1.line].data) then break end
local offset = utf8.offset(Lines[Cursor1.line].data, Cursor1.pos)
if Lines[Cursor1.line].data:sub(offset,offset) == ' ' then
break
end
end
end
function Text.left()
assert(Lines[Cursor1.line].mode == 'text')
if Cursor1.pos > 1 then
Cursor1.pos = Cursor1.pos-1
else
local new_cursor_line = Cursor1.line
while new_cursor_line > 1 do
new_cursor_line = new_cursor_line-1
if Lines[new_cursor_line].mode == 'text' then
Cursor1.line = new_cursor_line
Cursor1.pos = utf8.len(Lines[Cursor1.line].data) + 1
break
end
end
if Cursor1.line < Screen_top1.line then
Screen_top1.line = Cursor1.line
end
end
end
function Text.right()
assert(Lines[Cursor1.line].mode == 'text')
if Cursor1.pos <= utf8.len(Lines[Cursor1.line].data) then
Cursor1.pos = Cursor1.pos+1
else
local new_cursor_line = Cursor1.line
while new_cursor_line <= #Lines-1 do
new_cursor_line = new_cursor_line+1
if Lines[new_cursor_line].mode == 'text' then
Cursor1.line = new_cursor_line
Cursor1.pos = 1
break
end
end
if Cursor1.line > Screen_bottom1.line then
Screen_top1.line = Cursor1.line
end
end
end
function Text.pos_at_start_of_cursor_screen_line()
if Lines[Cursor1.line].screen_line_starting_pos == nil then
return 1,1
end
for i=#Lines[Cursor1.line].screen_line_starting_pos,1,-1 do
local spos = Lines[Cursor1.line].screen_line_starting_pos[i]
if spos <= Cursor1.pos then
return i,spos
end
end
assert(false)
end
function Text.cursor_at_final_screen_line()
if Lines[Cursor1.line].screen_line_starting_pos == nil then
return true
end
local screen_lines = Lines[Cursor1.line].screen_line_starting_pos
--? print(screen_lines[#screen_lines], Cursor1.pos)
return screen_lines[#screen_lines] <= Cursor1.pos
end
function Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary()
local y = 15 -- top margin
while Cursor1.line <= #Lines do
if Lines[Cursor1.line].mode == 'text' then
break
end
--? print('cursor skips', Cursor1.line)
y = y + 20 + Drawing.pixels(Lines[Cursor1.line].h)
Cursor1.line = Cursor1.line + 1
end
-- hack: insert a text line at bottom of file if necessary
if Cursor1.line > #Lines then
assert(Cursor1.line == #Lines+1)
table.insert(Lines, {mode='text', data=''})
end
--? print(y, App.screen.height, App.screen.height-math.floor(15*Zoom))
if y > App.screen.height - math.floor(15*Zoom) then
--? if Cursor1.line > Screen_bottom1.line then
--? print('scroll up')
Screen_top1.line = Cursor1.line
Text.scroll_up_while_cursor_on_screen()
end
end
function Text.scroll_up_while_cursor_on_screen()
local top2 = Text.to2(Cursor1)
--? print('cursor pos '..tostring(Cursor1.pos)..' is on the #'..tostring(top2.screen_line)..' screen line down')
local y = App.screen.height - math.floor(15*Zoom)
-- duplicate some logic from love.draw
while true do
--? print(y, 'top2:', top2.line, top2.screen_line, top2.screen_pos)
if top2.line == 1 and top2.screen_line == 1 then break end
if top2.screen_line > 1 or Lines[top2.line-1].mode == 'text' then
local h = math.floor(15*Zoom)
if y - h < 15 then -- top margin = 15
break
end
y = y - h
else
assert(top2.line > 1)
assert(Lines[top2.line-1].mode == 'drawing')
-- We currently can't draw partial drawings, so either skip it entirely
-- or not at all.
local h = 20 + Drawing.pixels(Lines[top2.line-1].h)
if y - h < 15 then
break
end
--? print('skipping drawing of height', h)
y = y - h
end
top2 = Text.previous_screen_line(top2)
end
--? print('top2 finally:', top2.line, top2.screen_line, top2.screen_pos)
Screen_top1 = Text.to1(top2)
--? print('top1 finally:', Screen_top1.line, Screen_top1.pos)
end
function Text.in_line(line, x,y)
if line.y == nil then return false end -- outside current page
if x < 25 then return false end
if y < line.y then return false end
if line.screen_line_starting_pos == nil then return y < line.y + math.floor(15*Zoom) end
return y < line.y + #line.screen_line_starting_pos * math.floor(15*Zoom)
end
-- mx,my in pixels
function Text.move_cursor(line_index, line, mx, my)
Cursor1.line = line_index
if line.screen_line_starting_pos == nil then
Cursor1.pos = Text.nearest_cursor_pos(line.data, mx)
return
end
assert(line.fragments)
assert(my >= line.y)
-- duplicate some logic from Text.draw
local y = line.y
for screen_line_index,screen_line_starting_pos in ipairs(line.screen_line_starting_pos) do
local nexty = y + math.floor(15*Zoom)
if my < nexty then
-- On all wrapped screen lines but the final one, clicks past end of
-- line position cursor on final character of screen line.
-- (The final screen line positions past end of screen line as always.)
if mx > Line_width and screen_line_index < #line.screen_line_starting_pos then
Cursor1.pos = line.screen_line_starting_pos[screen_line_index+1]
return
end
local s = string.sub(line.data, screen_line_starting_pos)
Cursor1.pos = screen_line_starting_pos + Text.nearest_cursor_pos(s, mx) - 1
return
end
y = nexty
end
assert(false)
end
-- manual test:
-- line: abc
-- def
-- gh
-- fragments: abc, def, gh
-- click inside e
-- line_starting_pos = 1 + 3 = 4
-- nearest_cursor_pos('defgh', mx) = 2
-- Cursor1.pos = 4 + 2 - 1 = 5
-- manual test:
-- click inside h
-- line_starting_pos = 1 + 3 + 3 = 7
-- nearest_cursor_pos('gh', mx) = 2
-- Cursor1.pos = 7 + 2 - 1 = 8
function Text.nearest_cursor_pos(line, x) -- x includes left margin
if x == 0 then
return 1
end
local len = utf8.len(line)
local max_x = 25+Text.x(line, len+1)
if x > max_x then
return len+1
end
local left, right = 1, len+1
--? print('-- nearest', x)
while true do
--? print('nearest', x, '^'..line..'$', left, right)
if left == right then
return left
end
local curr = math.floor((left+right)/2)
local currxmin = 25+Text.x(line, curr)
local currxmax = 25+Text.x(line, curr+1)
--? print('nearest', x, left, right, curr, currxmin, currxmax)
if currxmin <= x and x < currxmax then
if x-currxmin < currxmax-x then
return curr
else
return curr+1
end
end
if left >= right-1 then
return right
end
if currxmin > x then
right = curr
else
left = curr
end
end
assert(false)
end
function Text.nearest_pos_less_than(line, x) -- x DOES NOT include left margin
if x == 0 then
return 1
end
local len = utf8.len(line)
local max_x = Text.x(line, len+1)
if x > max_x then
return len+1
end
local left, right = 1, len+1
--? print('--')
while true do
local curr = math.floor((left+right)/2)
local currxmin = Text.x(line, curr+1)
local currxmax = Text.x(line, curr+2)
--? print(x, left, right, curr, currxmin, currxmax)
if currxmin <= x and x < currxmax then
return curr
end
if left >= right-1 then
return left
end
if currxmin > x then
right = curr
else
left = curr
end
end
assert(false)
end
function Text.x(s, pos)
local offset = utf8.offset(s, pos)
assert(offset)
local s_before = s:sub(1, offset-1)
local text_before = App.newText(love.graphics.getFont(), s_before)
return math.floor(App.width(text_before)*Zoom)
end
function Text.to2(pos1)
assert(Lines[pos1.line].mode == 'text')
local result = {line=pos1.line, screen_line=1}
if Lines[pos1.line].screen_line_starting_pos == nil then
result.screen_pos = pos1.pos
else
for i=#Lines[pos1.line].screen_line_starting_pos,1,-1 do
local spos = Lines[pos1.line].screen_line_starting_pos[i]
if spos <= pos1.pos then
result.screen_line = i
result.screen_pos = pos1.pos - spos + 1
break
end
end
end
assert(result.screen_pos)
return result
end
function Text.to1(pos2)
local result = {line=pos2.line, pos=pos2.screen_pos}
if pos2.screen_line > 1 then
result.pos = Lines[pos2.line].screen_line_starting_pos[pos2.screen_line] + pos2.screen_pos - 1
end
return result
end
function Text.lt1(a, b)
if a.line < b.line then
return true
end
if a.line > b.line then
return false
end
return a.pos < b.pos
end
function Text.le1(a, b)
if a.line < b.line then
return true
end
if a.line > b.line then
return false
end
return a.pos <= b.pos
end
function Text.previous_screen_line(pos2)
if pos2.screen_line > 1 then
return {line=pos2.line, screen_line=pos2.screen_line-1, screen_pos=1}
elseif pos2.line == 1 then
return pos2
elseif Lines[pos2.line-1].mode == 'drawing' then
return {line=pos2.line-1, screen_line=1, screen_pos=1}
else
local l = Lines[pos2.line-1]
if l.screen_line_starting_pos == nil then
return {line=pos2.line-1, screen_line=1, screen_pos=1}
else
return {line=pos2.line-1, screen_line=#Lines[pos2.line-1].screen_line_starting_pos, screen_pos=1}
end
end
end
function Text.populate_screen_line_starting_pos(line_index)
--? print('Text.populate_screen_line_starting_pos')
local line = Lines[line_index]
if line.screen_line_starting_pos then
return
end
-- duplicate some logic from Text.draw
if line.fragments == nil then
Text.compute_fragments(line, Line_width)
end
local x = 25
local pos = 1
for _, f in ipairs(line.fragments) do
local frag, frag_text = f.data, f.text
--? print(x, frag)
-- render fragment
local frag_width = math.floor(App.width(frag_text)*Zoom)
if x + frag_width > Line_width then
x = 25
if line.screen_line_starting_pos == nil then
line.screen_line_starting_pos = {1, pos}
else
--? print(' ', #line.screen_line_starting_pos, line.data)
table.insert(line.screen_line_starting_pos, pos)
end
end
x = x + frag_width
local frag_len = utf8.len(frag)
pos = pos + frag_len
end
end
return Text
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