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

This commit is contained in:
Kartik K. Agaram 2022-05-20 22:43:09 -07:00
parent e420245ee3
commit 0773b986dd
1 changed files with 21 additions and 4 deletions
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25
text.lua
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@ -294,6 +294,7 @@ function Text.keychord_pressed(chord)
Text.scroll_up_while_cursor_on_screen()
print('screen top after:', Screen_top_line, Top_screen_line_starting_pos)
end
print('=>', Cursor_line, Cursor_pos, Screen_bottom_line)
else
-- move down one screen line in current line
print('cursor is NOT at final screen line of its line')
@ -304,7 +305,9 @@ function Text.keychord_pressed(chord)
Cursor_pos = new_screen_line_starting_pos + Text.nearest_cursor_pos(s, Cursor_x) - 1
print('cursor pos is now '..tostring(Cursor_pos))
Screen_top_line = Cursor_line
print('scroll up preserving cursor')
Text.scroll_up_while_cursor_on_screen()
print('screen top after:', Screen_top_line, Top_screen_line_starting_pos)
end
end
end
@ -350,13 +353,27 @@ function Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necess
end
function Text.scroll_up_while_cursor_on_screen()
local y = Screen_height - math.floor(15*Zoom) -- for Cursor_line
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
while true do
if Screen_top_line == 1 then break end
y = y - math.floor(15*Zoom)
if Lines[Screen_top_line].mode == 'drawing' then
y = y - Drawing.pixels(Lines[Screen_top_line].h)
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
end
y = y - h
if y < math.floor(15*Zoom) then
break
end