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first stab at equally hacky cursor down support

This commit is contained in:
Kartik K. Agaram 2022-05-20 20:33:30 -07:00
parent ec5706e1ea
commit 6b91c0688e
1 changed files with 42 additions and 11 deletions
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53
text.lua
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@ -26,6 +26,13 @@ function Text.draw(line, line_width, line_index)
y = y + math.floor(15*Zoom)
if New_render then print('y', y) end
end
if y > Screen_height then
if line.screen_line_starting_pos then
Bottom_screen_line_starting_pos = line.screen_line_starting_pos[#line.screen_line_starting_pos]
else
Bottom_screen_line_starting_pos = 1
end
end
x = 25
if line.screen_line_starting_pos == nil then
line.screen_line_starting_pos = {1, pos}
@ -273,18 +280,33 @@ function Text.keychord_pressed(chord)
end
elseif chord == 'down' then
assert(Lines[Cursor_line].mode == 'text')
-- next text line
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
Cursor_line = new_cursor_line
Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, Cursor_x)
break
if Text.cursor_at_final_screen_line() then
-- line is done, skip to next text line
print('down: cursor at final screen line of its line')
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
Cursor_line = new_cursor_line
Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, Cursor_x)
print(Cursor_pos)
break
end
end
end
if Cursor_line > Screen_bottom_line then
Screen_top_line = Cursor_line
if Cursor_line > Screen_bottom_line then
Screen_top_line = Cursor_line
Text.scroll_up_while_cursor_on_screen()
end
else
-- move down one screen line in current line
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[Cursor_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[Cursor_line].data, new_screen_line_starting_pos)
Cursor_pos = new_screen_line_starting_pos + Text.nearest_cursor_pos(s, Cursor_x) - 1
print('cursor pos is now '..tostring(Cursor_pos))
Text.scroll_up_while_cursor_on_screen()
end
end
end
@ -302,6 +324,15 @@ function Text.pos_at_start_of_cursor_screen_line()
assert(false)
end
function Text.cursor_at_final_screen_line()
if Lines[Cursor_line].screen_line_starting_pos == nil then
return true
end
i=#Lines[Cursor_line].screen_line_starting_pos
local spos = Lines[Cursor_line].screen_line_starting_pos[i]
return spos <= Cursor_pos
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