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author | Kartik K. Agaram <vc@akkartik.com> | 2022-07-11 22:14:59 -0700 |
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committer | Kartik K. Agaram <vc@akkartik.com> | 2022-07-11 23:18:26 -0700 |
commit | 2e3a85d94be44bfb53554d0e7ba8a36f8e91c605 (patch) | |
tree | 8f677e27e45ba8e57db5eaea1380825531bb78b4 /main.lua | |
parent | 3dccd7f81abff050a37b5a65eb5e3cc6756a4b7f (diff) | |
download | lines.love-2e3a85d94be44bfb53554d0e7ba8a36f8e91c605.tar.gz |
experiment: new edit namespace
Still lots to do, but the eventual hope is that this will make this project's code easier to reuse from other LÖVE projects. One gotcha: even as we start putting code more aggressively into nested tables, tests must remain at the top-level. Otherwise they won't run.
Diffstat (limited to 'main.lua')
-rw-r--r-- | main.lua | 429 |
1 files changed, 13 insertions, 416 deletions
diff --git a/main.lua b/main.lua index 72b6834..6a4e30c 100644 --- a/main.lua +++ b/main.lua @@ -2,106 +2,17 @@ utf8 = require 'utf8' require 'app' require 'test' - require 'keychord' -require 'file' -require 'button' -require 'text' -require 'drawing' -require 'geom' -require 'help' -require 'icons' require 'main_tests' +-- delegate most business logic to a layer that can be reused by other projects +require 'edit' + -- called both in tests and real run function App.initialize_globals() --- a line is either text or a drawing --- a text is a table with: --- mode = 'text', --- string data, --- startpos, the index of data the line starts rendering from (if currently on screen), can only be >1 for topmost line on screen --- starty, the y coord in pixels --- some cached data that's blown away and recomputed when data changes: --- fragments: snippets of rendered love.graphics.Text, guaranteed to not wrap --- screen_line_starting_pos: optional array of grapheme indices if it wraps over more than one screen line --- a drawing is a table with: --- mode = 'drawing' --- a (y) coord in pixels (updated while painting screen), --- a (h)eight, --- an array of points, and --- an array of shapes --- a shape is a table containing: --- a mode --- an array points for mode 'freehand' (raw x,y coords; freehand drawings don't pollute the points array of a drawing) --- an array vertices for mode 'polygon', 'rectangle', 'square' --- p1, p2 for mode 'line' --- center, radius for mode 'circle' --- center, radius, start_angle, end_angle for mode 'arc' --- Unless otherwise specified, coord fields are normalized; a drawing is always 256 units wide --- The field names are carefully chosen so that switching modes in midstream --- remembers previously entered points where that makes sense. -Lines = {{mode='text', data=''}} - --- Lines can be too long to fit on screen, in which case they _wrap_ into --- multiple _screen lines_. --- --- Therefore, any potential location for the cursor can be described in two ways: --- * schema 1: As a combination of line index and position within a line (in utf8 codepoint units) --- * schema 2: As a combination of line index, screen line index within the line, and a position within the screen line. --- --- Most of the time we'll only persist positions in schema 1, translating to --- schema 2 when that's convenient. --- --- Make sure these coordinates are never aliased, so that changing one causes --- action at a distance. -Screen_top1 = {line=1, pos=1} -- position of start of screen line at top of screen -Cursor1 = {line=1, pos=1} -- position of cursor -Screen_bottom1 = {line=1, pos=1} -- position of start of screen line at bottom of screen - -Selection1 = {} -Old_cursor1, Old_selection1, Mousepress_shift = nil -- some extra state to compute selection between mouse press and release -Recent_mouse = {} -- when selecting text, avoid recomputing some state on every single frame - -Cursor_x, Cursor_y = 0, 0 -- in pixels - -Current_drawing_mode = 'line' -Previous_drawing_mode = nil - --- values for tests -Font_height = 14 -Line_height = 15 --- widest possible character width -Em = App.newText(love.graphics.getFont(), 'm') - -Margin_top = 15 -Margin_left = 25 -Margin_right = 25 -Margin_width = Margin_left + Margin_right - -Drawing_padding_top = 10 -Drawing_padding_bottom = 10 -Drawing_padding_height = Drawing_padding_top + Drawing_padding_bottom - -Filename = love.filesystem.getUserDirectory()..'/lines.txt' -Next_save = nil - --- undo -History = {} -Next_history = 1 - --- search -Search_term = nil -Search_text = nil -Search_backup = nil -- stuff to restore when cancelling search - --- resize -Last_resize_time = nil - --- blinking cursor -Cursor_time = 0 - -end -- App.initialize_globals + return edit.initialize_globals() +end -- called only for real run function App.initialize(arg) @@ -225,96 +136,15 @@ function App.filedropped(file) end function App.draw() - Button_handlers = {} - - love.graphics.setColor(0, 0, 0) ---? print(Screen_top1.line, Screen_top1.pos, Cursor1.line, Cursor1.pos) - assert(Text.le1(Screen_top1, Cursor1)) - Cursor_y = -1 - local y = Margin_top ---? print('== draw') - for line_index = Screen_top1.line,#Lines do - local line = Lines[line_index] ---? print('draw:', y, line_index, line) - if y + Line_height > App.screen.height then break end - Screen_bottom1.line = line_index - if line.mode == 'text' and line.data == '' then - line.starty = y - line.startpos = 1 - -- insert new drawing - button('draw', {x=4,y=y+4, w=12,h=12, color={1,1,0}, - icon = icon.insert_drawing, - onpress1 = function() - Drawing.before = snapshot(line_index-1, line_index) - table.insert(Lines, line_index, {mode='drawing', y=y, h=256/2, points={}, shapes={}, pending={}}) - if Cursor1.line >= line_index then - Cursor1.line = Cursor1.line+1 - end - schedule_save() - record_undo_event({before=Drawing.before, after=snapshot(line_index-1, line_index+1)}) - end - }) - if Search_term == nil then - if line_index == Cursor1.line then - Text.draw_cursor(Margin_left, y) - end - end - Screen_bottom1.pos = Screen_top1.pos - y = y + Line_height - elseif line.mode == 'drawing' then - y = y+Drawing_padding_top - line.y = y - Drawing.draw(line) - y = y + Drawing.pixels(line.h) + Drawing_padding_bottom - else - line.starty = y - line.startpos = 1 - if line_index == Screen_top1.line then - line.startpos = Screen_top1.pos - end ---? print('text.draw', y, line_index) - y, Screen_bottom1.pos = Text.draw(line, line_index, line.starty, Margin_left, App.screen.width-Margin_right) - y = y + Line_height ---? print('=> y', y) - end - end - if Cursor_y == -1 then - Cursor_y = App.screen.height - end ---? print('screen bottom: '..tostring(Screen_bottom1.pos)..' in '..tostring(Lines[Screen_bottom1.line].data)) - if Search_term then - Text.draw_search_bar() - end + edit.draw() end function App.update(dt) - Cursor_time = Cursor_time + dt - -- some hysteresis while resizing - if Last_resize_time then - if App.getTime() - Last_resize_time < 0.1 then - return - else - Last_resize_time = nil - end - end - Drawing.update(dt) - if Next_save and Next_save < App.getTime() then - save_to_disk(Lines, Filename) - Next_save = nil - end -end - -function schedule_save() - if Next_save == nil then - Next_save = App.getTime() + 3 -- short enough that you're likely to still remember what you did - end + edit.update(dt) end function love.quit() - -- make sure to save before quitting - if Next_save then - save_to_disk(Lines, Filename) - end + edit.quit() -- save some important settings local x,y,displayindex = love.window.getPosition() local filename = Filename @@ -331,254 +161,21 @@ function love.quit() end function App.mousepressed(x,y, mouse_button) - if Search_term then return end - -- ensure cursor is visible immediately after it moves - Cursor_time = 0 ---? print('press', Selection1.line, Selection1.pos) - propagate_to_button_handlers(x,y, mouse_button) - - for line_index,line in ipairs(Lines) do - if line.mode == 'text' then - if Text.in_line(line, x,y, Margin_left, App.screen.width-Margin_right) then - -- delicate dance between cursor, selection and old cursor/selection - -- scenarios: - -- regular press+release: sets cursor, clears selection - -- shift press+release: - -- sets selection to old cursor if not set otherwise leaves it untouched - -- sets cursor - -- press and hold to start a selection: sets selection on press, cursor on release - -- press and hold, then press shift: ignore shift - -- i.e. mousereleased should never look at shift state - Old_cursor1 = Cursor1 - Old_selection1 = Selection1 - Mousepress_shift = App.shift_down() - Selection1 = { - line=line_index, - pos=Text.to_pos_on_line(line, x, y, Margin_left, App.screen.width-Margin_right), - } ---? print('selection', Selection1.line, Selection1.pos) - break - end - elseif line.mode == 'drawing' then - if Drawing.in_drawing(line, x, y) then - Lines.current_drawing_index = line_index - Lines.current_drawing = line - Drawing.before = snapshot(line_index) - Drawing.mouse_pressed(line, x,y, mouse_button) - break - end - end - end + return edit.mouse_pressed(x,y, mouse_button) end function App.mousereleased(x,y, mouse_button) - if Search_term then return end ---? print('release') - -- ensure cursor is visible immediately after it moves - Cursor_time = 0 - if Lines.current_drawing then - Drawing.mouse_released(x,y, mouse_button) - schedule_save() - if Drawing.before then - record_undo_event({before=Drawing.before, after=snapshot(Lines.current_drawing_index)}) - Drawing.before = nil - end - else - for line_index,line in ipairs(Lines) do - if line.mode == 'text' then - if Text.in_line(line, x,y, Margin_left, App.screen.width-Margin_right) then ---? print('reset selection') - Cursor1 = { - line=line_index, - pos=Text.to_pos_on_line(line, x, y, Margin_left, App.screen.width-Margin_right), - } ---? print('cursor', Cursor1.line, Cursor1.pos) - if Mousepress_shift then - if Old_selection1.line == nil then - Selection1 = Old_cursor1 - else - Selection1 = Old_selection1 - end - end - Old_cursor1, Old_selection1, Mousepress_shift = nil - if eq(Cursor1, Selection1) then - Selection1 = {} - end - break - end - end - end ---? print('selection:', Selection1.line, Selection1.pos) - end + return edit.mouse_released(x,y, mouse_button) end function App.textinput(t) - -- ensure cursor is visible immediately after it moves - Cursor_time = 0 - for _,line in ipairs(Lines) do line.y = nil end -- just in case we scroll - if Search_term then - Search_term = Search_term..t - Search_text = nil - Text.search_next() - elseif Current_drawing_mode == 'name' then - local before = snapshot(Lines.current_drawing_index) - local drawing = Lines.current_drawing - local p = drawing.points[drawing.pending.target_point] - p.name = p.name..t - record_undo_event({before=before, after=snapshot(Lines.current_drawing_index)}) - else - Text.textinput(t) - end - schedule_save() + return edit.textinput(t) end function App.keychord_pressed(chord, key) - -- ensure cursor is visible immediately after it moves - Cursor_time = 0 - if Selection1.line and - not Lines.current_drawing and - -- printable character created using shift key => delete selection - -- (we're not creating any ctrl-shift- or alt-shift- combinations using regular/printable keys) - (not App.shift_down() or utf8.len(key) == 1) and - chord ~= 'C-c' and chord ~= 'C-x' and chord ~= 'backspace' and backspace ~= 'delete' and not App.is_cursor_movement(chord) then - Text.delete_selection(Margin_left, App.screen.width-Margin_right) - end - if Search_term then - if chord == 'escape' then - Search_term = nil - Search_text = nil - Cursor1 = Search_backup.cursor - Screen_top1 = Search_backup.screen_top - Search_backup = nil - Text.redraw_all() -- if we're scrolling, reclaim all fragments to avoid memory leaks - elseif chord == 'return' then - Search_term = nil - Search_text = nil - Search_backup = nil - elseif chord == 'backspace' then - local len = utf8.len(Search_term) - local byte_offset = Text.offset(Search_term, len) - Search_term = string.sub(Search_term, 1, byte_offset-1) - Search_text = nil - elseif chord == 'down' then - Cursor1.pos = Cursor1.pos+1 - Text.search_next() - elseif chord == 'up' then - Text.search_previous() - end - return - elseif chord == 'C-f' then - Search_term = '' - Search_backup = {cursor={line=Cursor1.line, pos=Cursor1.pos}, screen_top={line=Screen_top1.line, pos=Screen_top1.pos}} - assert(Search_text == nil) - elseif chord == 'C-=' then - initialize_font_settings(Font_height+2) - Text.redraw_all() - elseif chord == 'C--' then - initialize_font_settings(Font_height-2) - Text.redraw_all() - elseif chord == 'C-0' then - initialize_font_settings(20) - Text.redraw_all() - elseif chord == 'C-z' then - for _,line in ipairs(Lines) do line.y = nil end -- just in case we scroll - local event = undo_event() - if event then - local src = event.before - Screen_top1 = deepcopy(src.screen_top) - Cursor1 = deepcopy(src.cursor) - Selection1 = deepcopy(src.selection) - patch(Lines, event.after, event.before) - Text.redraw_all() -- if we're scrolling, reclaim all fragments to avoid memory leaks - schedule_save() - end - elseif chord == 'C-y' then - for _,line in ipairs(Lines) do line.y = nil end -- just in case we scroll - local event = redo_event() - if event then - local src = event.after - Screen_top1 = deepcopy(src.screen_top) - Cursor1 = deepcopy(src.cursor) - Selection1 = deepcopy(src.selection) - patch(Lines, event.before, event.after) - Text.redraw_all() -- if we're scrolling, reclaim all fragments to avoid memory leaks - schedule_save() - end - -- clipboard - elseif chord == 'C-c' then - for _,line in ipairs(Lines) do line.y = nil end -- just in case we scroll - local s = Text.selection() - if s then - App.setClipboardText(s) - end - elseif chord == 'C-x' then - for _,line in ipairs(Lines) do line.y = nil end -- just in case we scroll - local s = Text.cut_selection(Margin_left, App.screen.width-Margin_right) - if s then - App.setClipboardText(s) - end - schedule_save() - elseif chord == 'C-v' then - for _,line in ipairs(Lines) do line.y = nil end -- just in case we scroll - -- We don't have a good sense of when to scroll, so we'll be conservative - -- and sometimes scroll when we didn't quite need to. - local before_line = Cursor1.line - local before = snapshot(before_line) - local clipboard_data = App.getClipboardText() - for _,code in utf8.codes(clipboard_data) do - local c = utf8.char(code) - if c == '\n' then - Text.insert_return() - else - Text.insert_at_cursor(c) - end - end - if Text.cursor_past_screen_bottom() then - Text.snap_cursor_to_bottom_of_screen(Margin_left, App.screen.height-Margin_right) - end - schedule_save() - record_undo_event({before=before, after=snapshot(before_line, Cursor1.line)}) - -- dispatch to drawing or text - elseif App.mouse_down(1) or chord:sub(1,2) == 'C-' then - -- DON'T reset line.y here - local drawing_index, drawing = Drawing.current_drawing() - if drawing_index then - local before = snapshot(drawing_index) - Drawing.keychord_pressed(chord) - record_undo_event({before=before, after=snapshot(drawing_index)}) - schedule_save() - end - elseif chord == 'escape' and not App.mouse_down(1) then - for _,line in ipairs(Lines) do - if line.mode == 'drawing' then - line.show_help = false - end - end - elseif Current_drawing_mode == 'name' then - if chord == 'return' then - Current_drawing_mode = Previous_drawing_mode - Previous_drawing_mode = nil - else - local before = snapshot(Lines.current_drawing_index) - local drawing = Lines.current_drawing - local p = drawing.points[drawing.pending.target_point] - if chord == 'escape' then - p.name = nil - record_undo_event({before=before, after=snapshot(Lines.current_drawing_index)}) - elseif chord == 'backspace' then - local len = utf8.len(p.name) - local byte_offset = Text.offset(p.name, len-1) - if len == 1 then byte_offset = 0 end - p.name = string.sub(p.name, 1, byte_offset) - record_undo_event({before=before, after=snapshot(Lines.current_drawing_index)}) - end - end - schedule_save() - else - for _,line in ipairs(Lines) do line.y = nil end -- just in case we scroll - Text.keychord_pressed(chord) - end + return edit.keychord_pressed(chord, key) end function App.keyreleased(key, scancode) + return edit.key_released(key, scancode) end |