more precise height calculation when scrolling up as much as possible while keeping cursor on screen

[?]

May 21, 2022, 5:43 AM

TRNWIQN6RPLDLYWULLKG5L255E7E3DPNGLCSLAF6IJWYQRCCLARQC

Dependencies

[2] 2POFQQLW keep cursor on screen when pressing 'down'
[3] 242L3OQX bugfix: ensure Cursor_line is always on a text line
[4] HYEAFRZ2 split mouse_pressed events between Text and Drawing
[5] PR4KIAZD first stab at equally hacky cursor down support
[6] DXT4QTAH a few more integer coordinates
[*] BULPIBEG beginnings of a module for the text editor
[*] XNFTJHC4 split keyboard handling between Text and Drawing
[*] SVJZZDC3 snapshot - no, that's all wrong

Change contents

edit in text.lua at line 297

[9.4909]

[3.923]

print('=>', Cursor_line, Cursor_pos, Screen_bottom_line)
edit in text.lua at line 308

[2.158]

[3.1620]

print('scroll up preserving cursor')
edit in text.lua at line 310

[3.1666]

[10.1313]

print('screen top after:', Screen_top_line, Top_screen_line_starting_pos)
replacement in text.lua at line 356

[3.589]→[3.1:68](∅→∅)

local y = Screen_height - math.floor(15*Zoom) -- for Cursor_line

[3.589]

[3.644]

local cursor_pos_screen_lines = Text.pos_at_start_of_cursor_screen_line()
print('cursor pos '..tostring(Cursor_pos)..' is on the #'..tostring(cursor_pos_screen_lines)..' screen line down')
local y = Screen_height - cursor_pos_screen_lines*math.floor(15*Zoom)
-- duplicate some logic from love.draw
replacement in text.lua at line 362

[3.703]→[3.69:101](∅→∅),[3.101]→[3.723:831](∅→∅),[3.723]→[3.723:831](∅→∅)

y = y - math.floor(15*Zoom)
if Lines[Screen_top_line].mode == 'drawing' then
y = y - Drawing.pixels(Lines[Screen_top_line].h)

[3.703]

[3.831]

print('y', y)
local h = 0
if Lines[Screen_top_line-1].mode == 'drawing' then
h = 20 + Drawing.pixels(Lines[Screen_top_line-1].h)
elseif Lines[Screen_top_line-1].screen_line_starting_pos == nil then
h = h + math.floor(15*Zoom) -- text height
else
local n = #Lines[Screen_top_line-1].screen_line_starting_pos
h = h + n*math.floor(15*Zoom) -- text height
end
print('height:', h)
if y - h < 0 then
break
edit in text.lua at line 376

[3.839]

[3.102]

y = y - h