edit.lua

   1 -- some constants people might like to tweak
   2 Text_color = {r=0, g=0, b=0}
   3 Cursor_color = {r=1, g=0, b=0}
   4 Stroke_color = {r=0, g=0, b=0}
   5 Current_stroke_color = {r=0.7, g=0.7, b=0.7}  -- in process of being drawn
   6 Current_name_background_color = {r=1, g=0, b=0, a=0.1}  -- name currently being edited
   7 Focus_stroke_color = {r=1, g=0, b=0}  -- what mouse is hovering over
   8 Highlight_color = {r=0.7, g=0.7, b=0.9}  -- selected text
   9 Icon_color = {r=0.7, g=0.7, b=0.7}  -- color of current mode icon in drawings
  10 Help_color = {r=0, g=0.5, b=0}
  11 Help_background_color = {r=0, g=0.5, b=0, a=0.1}
  12
  13 Margin_top = 15
  14 Margin_left = 25
  15 Margin_right = 25
  16
  17 Drawing_padding_top = 10
  18 Drawing_padding_bottom = 10
  19 Drawing_padding_height = Drawing_padding_top + Drawing_padding_bottom
  20
  21 Same_point_distance = 4  -- pixel distance at which two points are considered the same
  22
  23 edit = {}
  24
  25 -- run in both tests and a real run
  26 function edit.initialize_state(top, left, right, font_height, line_height)  -- currently always draws to bottom of screen
  27   local result = {
  28     -- a line is either text or a drawing
  29     -- a text is a table with:
  30     --    mode = 'text',
  31     --    string data,
  32     -- a drawing is a table with:
  33     --    mode = 'drawing'
  34     --    a (y) coord in pixels (updated while painting screen),
  35     --    a (h)eight,
  36     --    an array of points, and
  37     --    an array of shapes
  38     -- a shape is a table containing:
  39     --    a mode
  40     --    an array points for mode 'freehand' (raw x,y coords; freehand drawings don't pollute the points array of a drawing)
  41     --    an array vertices for mode 'polygon', 'rectangle', 'square'
  42     --    p1, p2 for mode 'line'
  43     --    center, radius for mode 'circle'
  44     --    center, radius, start_angle, end_angle for mode 'arc'
  45     -- Unless otherwise specified, coord fields are normalized; a drawing is always 256 units wide
  46     -- The field names are carefully chosen so that switching modes in midstream
  47     -- remembers previously entered points where that makes sense.
  48     lines = {{mode='text', data=''}},  -- array of lines
  49
  50     -- Lines can be too long to fit on screen, in which case they _wrap_ into
  51     -- multiple _screen lines_.
  52
  53     -- rendering wrapped text lines needs some additional short-lived data per line:
  54     --   startpos, the index of data the line starts rendering from, can only be >1 for topmost line on screen
  55     --   starty, the y coord in pixels the line starts rendering from
  56     --   fragments: snippets of the line guaranteed to not straddle screen lines
  57     --   screen_line_starting_pos: optional array of grapheme indices if it wraps over more than one screen line
  58     line_cache = {},
  59
  60     -- Given wrapping, any potential location for the text cursor can be described in two ways:
  61     -- * schema 1: As a combination of line index and position within a line (in utf8 codepoint units)
  62     -- * schema 2: As a combination of line index, screen line index within the line, and a position within the screen line.
  63     --
  64     -- Most of the time we'll only persist positions in schema 1, translating to
  65     -- schema 2 when that's convenient.
  66     --
  67     -- Make sure these coordinates are never aliased, so that changing one causes
  68     -- action at a distance.
  69     screen_top1 = {line=1, pos=1},  -- position of start of screen line at top of screen
  70     cursor1 = {line=1, pos=1},  -- position of cursor
  71     screen_bottom1 = {line=1, pos=1},  -- position of start of screen line at bottom of screen
  72
  73     selection1 = {},
  74     -- some extra state to compute selection between mouse press and release
  75     old_cursor1 = nil,
  76     old_selection1 = nil,
  77     mousepress_shift = nil,
  78
  79     -- cursor coordinates in pixels
  80     cursor_x = 0,
  81     cursor_y = 0,
  82
  83     current_drawing_mode = 'line',
  84     previous_drawing_mode = nil,  -- extra state for some ephemeral modes like moving/deleting/naming points
  85
  86     font_height = font_height,
  87     line_height = line_height,
  88
  89     top = top,
  90     left = math.floor(left),
  91     right = math.floor(right),
  92     width = right-left,
  93
  94     filename = love.filesystem.getSourceBaseDirectory()..'/lines.txt',  -- '/' should work even on Windows
  95     next_save = nil,
  96
  97     -- undo
  98     history = {},
  99     next_history = 1,
 100
 101     -- search
 102     search_term = nil,
 103     search_backup = nil,  -- stuff to restore when cancelling search
 104   }
 105   return result
 106 end  -- App.initialize_state
 107
 108 function edit.check_locs(State)
 109   -- if State is inconsistent (i.e. file changed by some other program),
 110   --   throw away all cursor state entirely
 111   if edit.invalid1(State, State.screen_top1)
 112       or edit.invalid_cursor1(State)
 113       or not edit.cursor_on_text(State)
 114       or not Text.le1(State.screen_top1, State.cursor1) then
 115     State.screen_top1 = {line=1, pos=1}
 116     edit.put_cursor_on_next_text_line(State)
 117   end
 118 end
 119
 120 function edit.invalid1(State, loc1)
 121   if loc1.line > #State.lines then return true end
 122   local l = State.lines[loc1.line]
 123   if l.mode ~= 'text' then return false end  -- pos is irrelevant to validity for a drawing line
 124   return loc1.pos > #State.lines[loc1.line].data
 125 end
 126
 127 -- cursor loc in particular differs from other locs in one way:
 128 -- pos might occur just after end of line
 129 function edit.invalid_cursor1(State)
 130   local cursor1 = State.cursor1
 131   if cursor1.line > #State.lines then return true end
 132   local l = State.lines[cursor1.line]
 133   if l.mode ~= 'text' then return false end  -- pos is irrelevant to validity for a drawing line
 134   return cursor1.pos > #State.lines[cursor1.line].data + 1
 135 end
 136
 137 function edit.cursor_on_text(State)
 138   return State.cursor1.line <= #State.lines
 139       and State.lines[State.cursor1.line].mode == 'text'
 140 end
 141
 142 function edit.put_cursor_on_next_text_line(State)
 143   while true do
 144   if State.cursor1.line >= #State.lines then
 145     break
 146   end
 147   if State.lines[State.cursor1.line].mode == 'text' then
 148     break
 149   end
 150   State.cursor1.line = State.cursor1.line+1
 151   State.cursor1.pos = 1
 152   end
 153 end
 154
 155 -- return y drawn until
 156 function edit.draw(State)
 157   State.button_handlers = {}
 158   App.color(Text_color)
 159   if #State.lines ~= #State.line_cache then
 160     print(('line_cache is out of date; %d when it should be %d'):format(#State.line_cache, #State.lines))
 161     assert(false)
 162   end
 163   if not Text.le1(State.screen_top1, State.cursor1) then
 164     print(State.screen_top1.line, State.screen_top1.pos, State.cursor1.line, State.cursor1.pos)
 165     assert(false)
 166   end
 167   State.cursor_x = nil
 168   State.cursor_y = nil
 169   local y = State.top
 170   local screen_bottom1 = {line=nil, pos=nil}
 171 --?   print('== draw')
 172   for line_index = State.screen_top1.line,#State.lines do
 173     local line = State.lines[line_index]
 174 --?     print('draw:', y, line_index, line)
 175     if y + State.line_height > App.screen.height then break end
 176     screen_bottom1.line = line_index
 177     if line.mode == 'text' then
 178 --?       print('text.draw', y, line_index)
 179       local startpos = 1
 180       if line_index == State.screen_top1.line then
 181         startpos = State.screen_top1.pos
 182       end
 183       if line.data == '' then
 184         -- button to insert new drawing
 185         button(State, 'draw', {x=State.left-Margin_left+4, y=y+4, w=12,h=12, color={1,1,0},
 186           icon = icon.insert_drawing,
 187           onpress1 = function()
 188                        Drawing.before = snapshot(State, line_index-1, line_index)
 189                        table.insert(State.lines, line_index, {mode='drawing', y=y, h=256/2, points={}, shapes={}, pending={}})
 190                        table.insert(State.line_cache, line_index, {})
 191                        if State.cursor1.line >= line_index then
 192                          State.cursor1.line = State.cursor1.line+1
 193                        end
 194                        schedule_save(State)
 195                        record_undo_event(State, {before=Drawing.before, after=snapshot(State, line_index-1, line_index+1)})
 196                      end,
 197         })
 198       end
 199       y, screen_bottom1.pos = Text.draw(State, line_index, y, startpos)
 200 --?       print('=> y', y)
 201     elseif line.mode == 'drawing' then
 202       y = y+Drawing_padding_top
 203       Drawing.draw(State, line_index, y)
 204       y = y + Drawing.pixels(line.h, State.width) + Drawing_padding_bottom
 205     else
 206       print(line.mode)
 207       assert(false)
 208     end
 209   end
 210   State.screen_bottom1 = screen_bottom1
 211   if State.search_term then
 212     Text.draw_search_bar(State)
 213   end
 214   return y
 215 end
 216
 217 function edit.update(State, dt)
 218   Drawing.update(State, dt)
 219   if State.next_save and State.next_save < Current_time then
 220     save_to_disk(State)
 221     State.next_save = nil
 222   end
 223 end
 224
 225 function schedule_save(State)
 226   if State.next_save == nil then
 227     State.next_save = Current_time + 3  -- short enough that you're likely to still remember what you did
 228   end
 229 end
 230
 231 function edit.quit(State)
 232   -- make sure to save before quitting
 233   if State.next_save then
 234     save_to_disk(State)
 235     -- give some time for the OS to flush everything to disk
 236     love.timer.sleep(0.1)
 237   end
 238 end
 239
 240 function edit.mouse_press(State, x,y, mouse_button)
 241   if State.search_term then return end
 242 --?   print_and_log(('edit.mouse_press: cursor at %d,%d'):format(State.cursor1.line, State.cursor1.pos))
 243   if mouse_press_consumed_by_any_button_handler(State, x,y, mouse_button) then
 244     -- press on a button and it returned 'true' to short-circuit
 245     return
 246   end
 247
 248   if y < State.top then
 249     State.old_cursor1 = State.cursor1
 250     State.old_selection1 = State.selection1
 251     State.mousepress_shift = App.shift_down()
 252     State.selection1 = {
 253         line=State.screen_top1.line,
 254         pos=State.screen_top1.pos,
 255     }
 256     return
 257   end
 258
 259   for line_index,line in ipairs(State.lines) do
 260     if line.mode == 'text' then
 261       if Text.in_line(State, line_index, x,y) then
 262         -- delicate dance between cursor, selection and old cursor/selection
 263         -- scenarios:
 264         --  regular press+release: sets cursor, clears selection
 265         --  shift press+release:
 266         --    sets selection to old cursor if not set otherwise leaves it untouched
 267         --    sets cursor
 268         --  press and hold to start a selection: sets selection on press, cursor on release
 269         --  press and hold, then press shift: ignore shift
 270         --    i.e. mouse_release should never look at shift state
 271 --?         print_and_log(('edit.mouse_press: in line %d'):format(line_index))
 272         State.old_cursor1 = State.cursor1
 273         State.old_selection1 = State.selection1
 274         State.mousepress_shift = App.shift_down()
 275         State.selection1 = {
 276             line=line_index,
 277             pos=Text.to_pos_on_line(State, line_index, x, y),
 278         }
 279         return
 280       end
 281     elseif line.mode == 'drawing' then
 282       local line_cache = State.line_cache[line_index]
 283       if Drawing.in_drawing(line, line_cache, x, y, State.left,State.right) then
 284         State.lines.current_drawing_index = line_index
 285         State.lines.current_drawing = line
 286         Drawing.before = snapshot(State, line_index)
 287         Drawing.mouse_press(State, line_index, x,y, mouse_button)
 288         return
 289       end
 290     end
 291   end
 292
 293   -- still here? click is below all screen lines
 294   State.old_cursor1 = State.cursor1
 295   State.old_selection1 = State.selection1
 296   State.mousepress_shift = App.shift_down()
 297   State.selection1 = {
 298       line=State.screen_bottom1.line,
 299       pos=Text.pos_at_end_of_screen_line(State, State.screen_bottom1),
 300   }
 301 end
 302
 303 function edit.mouse_release(State, x,y, mouse_button)
 304   if State.search_term then return end
 305 --?   print_and_log(('edit.mouse_release: cursor at %d,%d'):format(State.cursor1.line, State.cursor1.pos))
 306   if State.lines.current_drawing then
 307     Drawing.mouse_release(State, x,y, mouse_button)
 308     schedule_save(State)
 309     if Drawing.before then
 310       record_undo_event(State, {before=Drawing.before, after=snapshot(State, State.lines.current_drawing_index)})
 311       Drawing.before = nil
 312     end
 313   else
 314 --?     print_and_log('edit.mouse_release: no current drawing')
 315     for line_index,line in ipairs(State.lines) do
 316       if line.mode == 'text' then
 317         if Text.in_line(State, line_index, x,y) then
 318 --?           print_and_log(('edit.mouse_release: in line %d'):format(line_index))
 319           State.cursor1 = {
 320               line=line_index,
 321               pos=Text.to_pos_on_line(State, line_index, x, y),
 322           }
 323 --?           print_and_log(('edit.mouse_release: cursor now %d,%d'):format(State.cursor1.line, State.cursor1.pos))
 324           if State.mousepress_shift then
 325             if State.old_selection1.line == nil then
 326               State.selection1 = State.old_cursor1
 327             else
 328               State.selection1 = State.old_selection1
 329             end
 330           end
 331           State.old_cursor1, State.old_selection1, State.mousepress_shift = nil
 332           if eq(State.cursor1, State.selection1) then
 333             State.selection1 = {}
 334           end
 335           break
 336         end
 337       end
 338     end
 339 --?     print_and_log(('edit.mouse_release: finally selection %s,%s cursor %d,%d'):format(tostring(State.selection1.line), tostring(State.selection1.pos), State.cursor1.line, State.cursor1.pos))
 340   end
 341 end
 342
 343 function edit.mouse_wheel_move(State, dx,dy)
 344   if dy > 0 then
 345     State.cursor1 = {line=State.screen_top1.line, pos=State.screen_top1.pos}
 346     edit.put_cursor_on_next_text_line(State)
 347     for i=1,math.floor(dy) do
 348       Text.up(State)
 349     end
 350   elseif dy < 0 then
 351     State.cursor1 = {line=State.screen_bottom1.line, pos=State.screen_bottom1.pos}
 352     edit.put_cursor_on_next_text_line(State)
 353     for i=1,math.floor(-dy) do
 354       Text.down(State)
 355     end
 356   end
 357 end
 358
 359 function edit.text_input(State, t)
 360 --?   print('text input', t)
 361   if State.search_term then
 362     State.search_term = State.search_term..t
 363     Text.search_next(State)
 364   elseif State.lines.current_drawing and State.current_drawing_mode == 'name' then
 365     local before = snapshot(State, State.lines.current_drawing_index)
 366     local drawing = State.lines.current_drawing
 367     local p = drawing.points[drawing.pending.target_point]
 368     p.name = p.name..t
 369     record_undo_event(State, {before=before, after=snapshot(State, State.lines.current_drawing_index)})
 370   else
 371     local drawing_index, drawing = Drawing.current_drawing(State)
 372     if drawing_index == nil then
 373       for _,line_cache in ipairs(State.line_cache) do line_cache.starty = nil end  -- just in case we scroll
 374       Text.text_input(State, t)
 375     end
 376   end
 377   schedule_save(State)
 378 end
 379
 380 function edit.keychord_press(State, chord, key)
 381   if State.selection1.line and
 382       not State.lines.current_drawing and
 383       -- printable character created using shift key => delete selection
 384       -- (we're not creating any ctrl-shift- or alt-shift- combinations using regular/printable keys)
 385       (not App.shift_down() or utf8.len(key) == 1) and
 386       chord ~= 'C-a' and chord ~= 'C-c' and chord ~= 'C-x' and chord ~= 'backspace' and chord ~= 'delete' and chord ~= 'C-z' and chord ~= 'C-y' and not App.is_cursor_movement(chord) then
 387     Text.delete_selection(State, State.left, State.right)
 388   end
 389   if State.search_term then
 390     for _,line_cache in ipairs(State.line_cache) do line_cache.starty = nil end  -- just in case we scroll
 391     if chord == 'escape' then
 392       State.search_term = nil
 393       State.cursor1 = State.search_backup.cursor
 394       State.screen_top1 = State.search_backup.screen_top
 395       State.search_backup = nil
 396       Text.redraw_all(State)  -- if we're scrolling, reclaim all fragments to avoid memory leaks
 397     elseif chord == 'return' then
 398       State.search_term = nil
 399       State.search_backup = nil
 400     elseif chord == 'backspace' then
 401       local len = utf8.len(State.search_term)
 402       local byte_offset = Text.offset(State.search_term, len)
 403       State.search_term = string.sub(State.search_term, 1, byte_offset-1)
 404     elseif chord == 'down' then
 405       State.cursor1.pos = State.cursor1.pos+1
 406       Text.search_next(State)
 407     elseif chord == 'up' then
 408       Text.search_previous(State)
 409     end
 410     return
 411   elseif chord == 'C-f' then
 412     State.search_term = ''
 413     State.search_backup = {
 414       cursor={line=State.cursor1.line, pos=State.cursor1.pos},
 415       screen_top={line=State.screen_top1.line, pos=State.screen_top1.pos},
 416     }
 417   -- zoom
 418   elseif chord == 'C-=' then
 419     edit.update_font_settings(State, State.font_height+2)
 420     Text.redraw_all(State)
 421   elseif chord == 'C--' then
 422     if State.font_height > 2 then
 423       edit.update_font_settings(State, State.font_height-2)
 424       Text.redraw_all(State)
 425     end
 426   elseif chord == 'C-0' then
 427     edit.update_font_settings(State, 20)
 428     Text.redraw_all(State)
 429   -- undo
 430   elseif chord == 'C-z' then
 431     for _,line_cache in ipairs(State.line_cache) do line_cache.starty = nil end  -- just in case we scroll
 432     local event = undo_event(State)
 433     if event then
 434       local src = event.before
 435       State.screen_top1 = deepcopy(src.screen_top)
 436       State.cursor1 = deepcopy(src.cursor)
 437       State.selection1 = deepcopy(src.selection)
 438       patch(State.lines, event.after, event.before)
 439       patch_placeholders(State.line_cache, event.after, event.before)
 440       -- invalidate various cached bits of lines
 441       State.lines.current_drawing = nil
 442       -- if we're scrolling, reclaim all fragments to avoid memory leaks
 443       Text.redraw_all(State)
 444       schedule_save(State)
 445     end
 446   elseif chord == 'C-y' then
 447     for _,line_cache in ipairs(State.line_cache) do line_cache.starty = nil end  -- just in case we scroll
 448     local event = redo_event(State)
 449     if event then
 450       local src = event.after
 451       State.screen_top1 = deepcopy(src.screen_top)
 452       State.cursor1 = deepcopy(src.cursor)
 453       State.selection1 = deepcopy(src.selection)
 454       patch(State.lines, event.before, event.after)
 455       -- invalidate various cached bits of lines
 456       State.lines.current_drawing = nil
 457       -- if we're scrolling, reclaim all fragments to avoid memory leaks
 458       Text.redraw_all(State)
 459       schedule_save(State)
 460     end
 461   -- clipboard
 462   elseif chord == 'C-a' then
 463     State.selection1 = {line=1, pos=1}
 464     State.cursor1 = {line=#State.lines, pos=utf8.len(State.lines[#State.lines].data)+1}
 465   elseif chord == 'C-c' then
 466     local s = Text.selection(State)
 467     if s then
 468       App.set_clipboard(s)
 469     end
 470   elseif chord == 'C-x' then
 471     for _,line_cache in ipairs(State.line_cache) do line_cache.starty = nil end  -- just in case we scroll
 472     local s = Text.cut_selection(State, State.left, State.right)
 473     if s then
 474       App.set_clipboard(s)
 475     end
 476     schedule_save(State)
 477   elseif chord == 'C-v' then
 478     for _,line_cache in ipairs(State.line_cache) do line_cache.starty = nil end  -- just in case we scroll
 479     -- We don't have a good sense of when to scroll, so we'll be conservative
 480     -- and sometimes scroll when we didn't quite need to.
 481     local before_line = State.cursor1.line
 482     local before = snapshot(State, before_line)
 483     local clipboard_data = App.get_clipboard()
 484     for _,code in utf8.codes(clipboard_data) do
 485       local c = utf8.char(code)
 486       if c == '\n' then
 487         Text.insert_return(State)
 488       else
 489         Text.insert_at_cursor(State, c)
 490       end
 491     end
 492     if Text.cursor_out_of_screen(State) then
 493       Text.snap_cursor_to_bottom_of_screen(State, State.left, State.right)
 494     end
 495     schedule_save(State)
 496     record_undo_event(State, {before=before, after=snapshot(State, before_line, State.cursor1.line)})
 497   -- dispatch to drawing or text
 498   elseif App.mouse_down(1) or chord:sub(1,2) == 'C-' then
 499     -- DON'T reset line_cache.starty here
 500     local drawing_index, drawing = Drawing.current_drawing(State)
 501     if drawing_index then
 502       local before = snapshot(State, drawing_index)
 503       Drawing.keychord_press(State, chord)
 504       record_undo_event(State, {before=before, after=snapshot(State, drawing_index)})
 505       schedule_save(State)
 506     end
 507   elseif chord == 'escape' and not App.mouse_down(1) then
 508     for _,line in ipairs(State.lines) do
 509       if line.mode == 'drawing' then
 510         line.show_help = false
 511       end
 512     end
 513   elseif State.lines.current_drawing and State.current_drawing_mode == 'name' then
 514     if chord == 'return' then
 515       State.current_drawing_mode = State.previous_drawing_mode
 516       State.previous_drawing_mode = nil
 517     else
 518       local before = snapshot(State, State.lines.current_drawing_index)
 519       local drawing = State.lines.current_drawing
 520       local p = drawing.points[drawing.pending.target_point]
 521       if chord == 'escape' then
 522         p.name = nil
 523         record_undo_event(State, {before=before, after=snapshot(State, State.lines.current_drawing_index)})
 524       elseif chord == 'backspace' then
 525         local len = utf8.len(p.name)
 526         if len > 0 then
 527           local byte_offset = Text.offset(p.name, len-1)
 528           if len == 1 then byte_offset = 0 end
 529           p.name = string.sub(p.name, 1, byte_offset)
 530           record_undo_event(State, {before=before, after=snapshot(State, State.lines.current_drawing_index)})
 531         end
 532       end
 533     end
 534     schedule_save(State)
 535   else
 536     for _,line_cache in ipairs(State.line_cache) do line_cache.starty = nil end  -- just in case we scroll
 537     Text.keychord_press(State, chord)
 538   end
 539 end
 540
 541 function edit.key_release(State, key, scancode)
 542 end
 543
 544 function edit.update_font_settings(State, font_height)
 545   State.font_height = font_height
 546   love.graphics.setFont(love.graphics.newFont(State.font_height))
 547   State.line_height = math.floor(font_height*1.3)
 548 end
 549
 550 --== some methods for tests
 551
 552 -- Insulate tests from some key globals so I don't have to change the vast
 553 -- majority of tests when they're modified for the real app.
 554 Test_margin_left = 25
 555 Test_margin_right = 0
 556
 557 function edit.initialize_test_state()
 558   -- if you change these values, tests will start failing
 559   return edit.initialize_state(
 560       15,  -- top margin
 561       Test_margin_left,
 562       App.screen.width - Test_margin_right,
 563       14,  -- font height assuming default LÖVE font
 564       15)  -- line height
 565 end
 566
 567 -- all text_input events are also keypresses
 568 -- TODO: handle chords of multiple keys
 569 function edit.run_after_text_input(State, t)
 570   edit.keychord_press(State, t)
 571   edit.text_input(State, t)
 572   edit.key_release(State, t)
 573   App.screen.contents = {}
 574   edit.update(State, 0)
 575   edit.draw(State)
 576 end
 577
 578 -- not all keys are text_input
 579 function edit.run_after_keychord(State, chord)
 580   edit.keychord_press(State, chord)
 581   edit.key_release(State, chord)
 582   App.screen.contents = {}
 583   edit.update(State, 0)
 584   edit.draw(State)
 585 end
 586
 587 function edit.run_after_mouse_click(State, x,y, mouse_button)
 588   App.fake_mouse_press(x,y, mouse_button)
 589   edit.mouse_press(State, x,y, mouse_button)
 590   App.fake_mouse_release(x,y, mouse_button)
 591   edit.mouse_release(State, x,y, mouse_button)
 592   App.screen.contents = {}
 593   edit.update(State, 0)
 594   edit.draw(State)
 595 end
 596
 597 function edit.run_after_mouse_press(State, x,y, mouse_button)
 598   App.fake_mouse_press(x,y, mouse_button)
 599   edit.mouse_press(State, x,y, mouse_button)
 600   App.screen.contents = {}
 601   edit.update(State, 0)
 602   edit.draw(State)
 603 end
 604
 605 function edit.run_after_mouse_release(State, x,y, mouse_button)
 606   App.fake_mouse_release(x,y, mouse_button)
 607   edit.mouse_release(State, x,y, mouse_button)
 608   App.screen.contents = {}
 609   edit.update(State, 0)
 610   edit.draw(State)
 611 end