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avoid scrolling down if possible

This commit is contained in:
Kartik K. Agaram 2022-05-30 17:24:23 -07:00
parent d0d22fffbc
commit 819cb4b1cc
1 changed files with 28 additions and 1 deletions
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29
text.lua
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@ -862,6 +862,32 @@ function test_enter_on_bottom_line_scrolls_down()
App.screen.check(y, 'hi', 'F - test_enter_on_bottom_line_scrolls_down/screen:3')
end
function test_enter_on_final_line_avoids_scrolling_down_when_not_at_bottom()
io.write('\ntest_enter_on_final_line_avoids_scrolling_down_when_not_at_bottom')
-- display just the bottom line on screen
App.screen.init{width=25+30, height=60}
Lines = load_array{'abc', 'def', 'ghi', 'jkl'}
Line_width = App.screen.width
Cursor1 = {line=4, pos=2}
Screen_top1 = {line=4, 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, 'jkl', 'F - test_enter_on_final_line_avoids_scrolling_down_when_not_at_bottom/baseline/screen:1')
-- after hitting the enter key the screen does not scroll down
App.run_after_keychord('return')
check_eq(Screen_top1.line, 4, 'F - test_enter_on_final_line_avoids_scrolling_down_when_not_at_bottom/screen_top')
check_eq(Cursor1.line, 5, 'F - test_enter_on_final_line_avoids_scrolling_down_when_not_at_bottom/cursor:line')
check_eq(Cursor1.pos, 1, 'F - test_enter_on_final_line_avoids_scrolling_down_when_not_at_bottom/cursor:pos')
y = screen_top_margin
App.screen.check(y, 'j', 'F - test_enter_on_final_line_avoids_scrolling_down_when_not_at_bottom/screen:1')
y = y + line_height
App.screen.check(y, 'kl', 'F - test_enter_on_final_line_avoids_scrolling_down_when_not_at_bottom/screen:2')
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')
@ -1135,12 +1161,13 @@ function Text.keychord_pressed(chord)
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)})
local scroll_down = (Cursor_y + math.floor(15*Zoom)) > App.screen.height
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
if scroll_down then
Screen_top1.line = Cursor1.line
Text.scroll_up_while_cursor_on_screen()
end