# SETTINGS
overlay_padding = 10
+breathing_room = 30 # minimum pixels above/below cursor
timeout = (ms, cb) -> return setTimeout cb, ms
next_frame = (cb) ->
throw "how is this possible?"
next_i -= 1
return 1
- whitespace_to_space = (undo) ->
+ replace_with_space = (undo) ->
if undo
cur.text = (cur.text.substr 0, cur_i) + removed_char + (cur.text.substr cur_i + 1)
cur.el.textContent = cur.text
else
removed_char = cur.text.charAt(cur_i)
- cur.text = (cur.text.substr 0, cur_i) + ' ' + (cur.text.substr cur_i + 1)
- cur.el.textContent = cur.text
+ if removed_char isnt ' '
+ cur.text = (cur.text.substr 0, cur_i) + ' ' + (cur.text.substr cur_i + 1)
+ cur.el.textContent = cur.text
return 0
# return true if cur was removed from the dom (ie re-use same prev)
operate = ->
# cur definitately set
# prev and/or next might be null, indicating the start/end of a display:block
return false unless is_space_code cur.text.charCodeAt cur_i
- fixers = [remove, whitespace_to_space]
+ fixers = [remove, replace_with_space]
+ # check for common case: single whitespace surrounded by non-whitespace chars
+ if prev? and next?
+ unless (is_space_code prev.text.charCodeAt prev_i) or (is_space_code next.text.charCodeAt next_i)
+ dbg = cur.text.charCodeAt cur_i
+ if cur.text.charAt(cur_i) is ' ' # perens required
+ # single space can't collapse, doesn't need fixin'
+ return false
+ else
+ # tab, newline, etc, can't collapse, but maybe should be replaced
+ fixers = [replace_with_space]
bounds = text_range_bounds cur.el, cur_i, cur_i + 1
# consistent cases:
# 1. zero rects returned by getClientRects() means collapsed space
return remove()
# 2. width greater than zero means visible space
if bounds.w > 0
- fixers.shift() # don't try removing
+ # has bounds, don't try removing
+ fixers = [replace_with_space]
# now the weird edge cases...
#
# firefox and chromium both report zero width for characters at the end
# collapsed spaces via the range/bounds api, so...
#
# remove it from the dom, and if prev or next moves, put it back.
+ #
+ # this block (try changing it, put it back if something moves) is also
+ # used on collapsable whitespace characters besides space. In this case
+ # the character is replaced with a normal space character instead of
+ # removed
if prev? and not prev_px?
prev_px = new_cursor_position n: prev, i: prev_i
if next? and not next_px?
when KEY_INSERT
return false
when KEY_PAGE_UP
+ @on_page_up_key e
return false
when KEY_PAGE_DOWN
+ @on_page_down_key e
return false
when KEY_TAB
return false
@kill_cursor
return
else if @cursor.i is 0
- console.log 'not implemented yet'
+ console.log 'unimplemented: backspace at start of non-empty tag'
# TODO if block, merge parent into prev
# TODO if inline, delete char from prev text node
return false
else
# TODO handle case of removing last char
- @remove_character @cursor.n, @cursor.i - 1
+ # CONTINUE
+ if @is_only_char_in_tag @cursor.n
+ if is_display_block @cursor.n.parent.el
+ @cursor.n.el.textContent = @cursor.n.text = ' '
+ else
+ console.log "unimplemented: delete last char in inline" # FIXME
+ return
+ else
+ @remove_character @cursor.n, @cursor.i - 1
@adjust_whitespace_style @cursor.n
@changed()
new_cursor = new_cursor_position n: @cursor.n, i: @cursor.i - 1
@move_cursor new_cursor
else
@kill_cursor()
+ return
+ on_page_up_key: (e) ->
+ if @wrap2.scrollTop is 0
+ return unless @cursor?
+ new_cursor = first_cursor_position @tree
+ if new_cursor?
+ if new_cursor.n isnt @cursor.n or new_cursor.i isnt @cursor.i
+ @move_cursor new_cursor
+ return
+ if @cursor?
+ screen_y = @cursor.y - @wrap2.scrollTop
+ scroll_amount = @wrap2_height - breathing_room
+ @wrap2.scrollTop = Math.max 0, @wrap2.scrollTop - scroll_amount
+ if @cursor?
+ @move_cursor_into_view screen_y + @wrap2.scrollTop
+ on_page_down_key: (e) ->
+ lowest_scrollpos = @wrap2.scrollHeight - @wrap2_height
+ if @wrap2.scrollTop is lowest_scrollpos
+ return unless @cursor?
+ new_cursor = last_cursor_position @tree
+ if new_cursor?
+ if new_cursor.n isnt @cursor.n or new_cursor.i isnt @cursor.i
+ @move_cursor new_cursor
+ return
+ if @cursor?
+ screen_y = @cursor.y - @wrap2.scrollTop
+ scroll_amount = @wrap2_height - breathing_room
+ @wrap2.scrollTop = Math.min lowest_scrollpos, @wrap2.scrollTop + scroll_amount
+ if @cursor?
+ @move_cursor_into_view screen_y + @wrap2.scrollTop
+ return
+ move_cursor_into_view: (y_target) ->
+ return if y_target is @cursor.y
+ was = @cursor
+ y_min = @wrap2.scrollTop
+ unless @wrap2.scrollTop is 0
+ y_min += breathing_room
+ y_max = @wrap2.scrollTop + @wrap2_height
+ unless @wrap2.scrollTop is @wrap2.scrollHeight - @wrap2_height # downmost
+ y_max -= breathing_room
+ y_target = Math.min y_target, y_max
+ y_target = Math.max y_target, y_min
+ if y_target < @cursor.y
+ finder = find_up_cursor_position
+ far_enough = (cur, target_y) ->
+ return cur.y + cur.h <= target_y
+ else
+ finder = find_down_cursor_position
+ far_enough = (cur, y_target) ->
+ return cur.y >= y_target
+ loop
+ cur = finder @tree, was, @cursor_ideal_x
+ break unless cur?
+ break if far_enough cur, y_target
+ was = cur
+ if was is @cursor
+ was = null
+ if was?
+ if was.y + was.h > y_max
+ was = null
+ else if was.y < y_min
+ was = null
+ if cur?
+ if cur.y + cur.h > y_max
+ cur = null
+ else if cur.y < y_min
+ cur = null
+ if cur? and was?
+ # both valid, pick best
+ if cur.y < y_min
+ new_cursor = was
+ else if was.y + was.h > y_max
+ new_cursor = cur
+ else if cur.y - y_target < y_target - was.y
+ new_cursor = cur
+ else
+ new_cursor = was
+ else
+ new_cursor = was ? cur
+ if new_cursor?
+ saved_ideal_x = @cursor_ideal_x
+ @move_cursor new_cursor
+ @cursor_ideal_x = saved_ideal_x
+ return
clear_dom: -> # remove all the editable content (and cursor, overlays, etc)
while @idoc.body.childNodes.length
@idoc.body.removeChild @idoc.body.childNodes[0]
if needle is n.attrs.style.substr n.attrs.style.length - needle
n.attrs.style = n.attrs.style.substr 0, n.attrs.style.length - needle
n.el.setAttribute n.attrs.style
+ # true if n is text node with only one caracter, and the only child of a tag
+ is_only_char_in_tag: (n, i) ->
+ return false unless n.type is 'text'
+ return false unless n.text.length is 1
+ return false if n.parent is @tree_parent
+ return false unless n.parent.children.length is 1
+ return true
# true if n is text node with just a space in it, and the only child of a tag
is_lone_space: (n, i) ->
return false unless n.type is 'text'
return false unless n.text is ' '
return false if n.parent is @tree_parent
- if n.parent.children.length is 1
- if n.parent.children[0] is n
- # n is only child
- return true
- return false
+ return false unless n.parent.children.length is 1
+ return true
# detect special case: typing before a space that's the only thing in a block/doc
# reason: enter key creates blocks with just a space in them
insert_should_replace: (n, i) ->
@annotate cursor.n
@scroll_into_view cursor.y, height
scroll_into_view: (y, h = 0) ->
- closest = 30 # setting: smallest pixels from top/bottom of screet that's OK
y += overlay_padding # convert units from @idoc to @wrap2
# very top of document
- if y <= closest
+ if y <= breathing_room
@wrap2.scrollTop = 0
return
# very bottom of document
- if y + h >= @wrap2.scrollHeight - closest
+ if y + h >= @wrap2.scrollHeight - breathing_room
@wrap2.scrollTop = @wrap2.scrollHeight - @wrap2_height
return
# The most scrolled up (lowest value for scrollTop) that would be OK
- upmost = y + h + closest - @wrap2_height
+ upmost = y + h + breathing_room - @wrap2_height
upmost = Math.max(upmost, 0)
# the most scrolled down (highest value for scrollTop) that would be OK
- downmost = y - closest
+ downmost = y - breathing_room
downmost = Math.min(downmost, @wrap2.scrollHeight - @wrap2_height)
if upmost > downmost # means h is too big to fit
# scroll so top is visible