first stab at supporting wrapping in cursor up
Looks pretty clean.
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parent
1c20d514f2
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11
manual_tests
11
manual_tests
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@ -14,3 +14,14 @@ backspace
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enter
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cursor_pos == 0 -> insert empty line above current line
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scrolling:
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given moby dick, a file containing all text:
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page up moves top line on screen to bottom
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page down moves bottom line on screen to top
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cursor remains on screen
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cursor remains on text line
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'up' arrow with cursor at top of screen scrolls up one line (drawings still fully in or out)
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if top line wrapped before, it scrolls up by only one screen line
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'down' arrow with cursor at bottom of screen scrolls down one line (drawings still fully in or out)
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if top line wrapped before, it scrolls down by only one screen line
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35
text.lua
35
text.lua
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@ -19,7 +19,7 @@ function Text.draw(line, line_width, line_index)
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local frag_width = math.floor(frag_text:getWidth()*Zoom)
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if x + frag_width > line_width then
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assert(x > 25) -- no overfull lines
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if line_index > Screen_top_line or pos >= Top_screen_line_starting_pos then
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if line_index > Screen_top_line or pos > Top_screen_line_starting_pos then
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y = y + math.floor(15*Zoom)
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end
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x = 25
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@ -219,19 +219,28 @@ function Text.keychord_pressed(chord)
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save_to_disk(Lines, Filename)
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elseif chord == 'up' then
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assert(Lines[Cursor_line].mode == 'text')
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-- previous text line
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local new_cursor_line = Cursor_line
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while new_cursor_line > 1 do
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new_cursor_line = new_cursor_line-1
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if Lines[new_cursor_line].mode == 'text' then
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local old_x = Text.cursor_x(Lines[new_cursor_line].data, Cursor_pos)
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Cursor_line = new_cursor_line
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Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, old_x)
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break
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if Top_screen_line_starting_pos == 1 then
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-- top line is done; skip to previous text line
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local new_cursor_line = Cursor_line
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while new_cursor_line > 1 do
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new_cursor_line = new_cursor_line-1
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if Lines[new_cursor_line].mode == 'text' then
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local old_x = Text.cursor_x(Lines[new_cursor_line].data, Cursor_pos)
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Cursor_line = new_cursor_line
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Cursor_pos = Text.nearest_cursor_pos(Lines[Cursor_line].data, old_x)
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break
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end
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end
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end
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if Cursor_line < Screen_top_line then
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Screen_top_line = Cursor_line
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if Cursor_line < Screen_top_line then
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Screen_top_line = Cursor_line
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end
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else
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-- scroll up just one screen line in current line
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local screen_line_index = table.find(Lines[Cursor_line].screen_line_starting_pos, Top_screen_line_starting_pos)
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assert(screen_line_index > 1)
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Top_screen_line_starting_pos = Lines[Cursor_line].screen_line_starting_pos[screen_line_index-1]
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local s = string.sub(Lines[Cursor_line].data, Top_screen_line_starting_pos)
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Cursor_pos = Text.nearest_cursor_pos(s, Cursor_x)
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end
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elseif chord == 'down' then
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assert(Lines[Cursor_line].mode == 'text')
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