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lines.love
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scroll on backspace

This commit is contained in:
Kartik K. Agaram 2022-05-28 09:41:02 -07:00
parent cf94d36a5f
commit 916e4ce341
1 changed files with 68 additions and 0 deletions
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68
text.lua
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@ -770,6 +770,68 @@ function test_position_cursor_on_recently_edited_wrapping_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 = {}
@ -910,6 +972,12 @@ function Text.keychord_pressed(chord)
end
Cursor1.line = Cursor1.line-1
end
if Cursor1.line < Screen_top1.line or (Cursor1.line == Screen_top1.line and Cursor1.pos < Screen_top1.pos) then
local top2 = Text.to2(Screen_top1)
top2 = Text.previous_screen_line(top2)
Screen_top1 = Text.to1(top2)
end
assert(Cursor1.line > Screen_top1.line or (Cursor1.line == Screen_top1.line and Cursor1.pos >= Screen_top1.pos))
save_to_disk(Lines, Filename)
elseif chord == 'delete' then
if Cursor1.pos <= utf8.len(Lines[Cursor1.line].data) then