throw 'bork bork' unless new_cursor?
@move_cursor new_cursor
# TODO move content past cursor into this new block
+ # unlike the global function, this takes a Node, not an element
+ is_display_block: (n) ->
+ # TODO stop calling global function, merge it into here, use iframe's window object
+ return false unless n.type is 'tag'
+ return is_display_block n.el
+ find_block_parent: (n) ->
+ loop
+ n = n.parent
+ return null unless n?
+ return n if is_display_block n.el
+ return n if n is @tree_parent
+ return null
on_key_backspace: (e) ->
return false unless @cursor?
if @is_lone_space @cursor.n # false if it's not in a tag
else
@kill_cursor()
else
+ # cursor at the begining of an element that contains only a space
parent = @cursor.n.parent
new_cursor = find_prev_cursor_position @tree, @cursor
if new_cursor?
else
@kill_cursor
return
- else if @cursor.i is 0
- 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 if @cursor.i is 0 # start of text chunk
+ # FIXME clean this up: use new code for text runs
+ # FIXME handle backspacing a <br> even if it's near a inline tag boundary
+ # determine if cursor is at start of text run (text formatted inline)
+ block = @find_block_parent @cursor.n
+ return unless block
+ at_block_start = true
+ prev_pos = find_prev_cursor_position @tree, @cursor
+ unless prev_pos?
+ # if the cursor can't go back, then there's probably nowhere we can merge into
+ # TODO consider case of nested blocks. should backspace remove one?
+ return
+ prev_pos_block = @find_block_parent prev_pos.n
+ if prev_pos_block is block
+ # context: there is text before the cursor within the same block.
+ # FIXME clean up this hack for looking for <br> (see above)
+ cursor_text_pi = @cursor.n.parent.children.indexOf @cursor.n
+ if cursor_text_pi > 0
+ prev_node = @cursor.n.parent.children[cursor_text_pi - 1]
+ if prev_node.type is 'tag' and prev_node.name is 'br'
+ @remove_node prev_node
+ @text_cleanup @cursor.n.parent
+ @changed()
+ new_cursor = new_cursor_position n: prev_pos.n, i: prev_pos.i
+ if new_cursor?
+ @move_cursor new_cursor
+ else
+ @kill_cursor
+ return
+ # note: find_prev_cursor_position just crossed a boundary, not a character
+ # prev_pos is within the same block, try deleting there
+ @move_cursor prev_pos
+ # FIXME cleanup: don't call @move_cursor twice if the next line succeeds
+ return @on_key_backspace()
+ # context: backspace pressed at start of a display:block
+ return if block is @tree_parent # top level text
+ parent = block.parent
+ parent_i = parent.children.indexOf block
+ if parent_i is -1
+ throw "BUG #98270918347"
+ return
+ if parent_i is 0
+ # no previous sibling to merge into, so instead move contents into parent
+ dest = parent
+ before = block
+ else
+ # FIXME prev_sib should be the previous in-flow element
+ # ie it should skip comments, hidden things, floating things, etc.
+ prev_sib = parent.children[parent_i - 1]
+ if @is_display_block prev_sib
+ dest = prev_sib
+ before = null # null means append
+ else
+ dest = parent
+ before = block
+ if dest is @tree_parent
+ # don't remove outer-most blocks
+ return
+ while block.children.length > 0
+ n = block.children[block.children.length - 1]
+ @move_node n, dest, before
+ block.children.pop()
+ before = n
+ @remove_node block
+ @text_cleanup dest
+ @changed()
+ new_cursor = new_cursor_position n: prev_pos.n, i: prev_pos.i
+ if new_cursor?
+ @move_cursor new_cursor
+ else
+ @kill_cursor
+ return
else
# TODO handle case of removing last char
# CONTINUE
if @is_only_char_in_tag @cursor.n
- if is_display_block @cursor.n.parent.el
+ if @is_display_block @cursor.n.parent
@cursor.n.el.textContent = @cursor.n.text = ' '
else
console.log "unimplemented: delete last char in inline" # FIXME
# does this node have whitespace that would be collapsed by white-space: normal?
# note: this checks direct text children, and does _not_ recurse into child tags
# tag is a node with type:"tag"
+ # FIXME use new textrun api
has_collapsable_space: (tag) ->
for n in tag.children
if n.type is 'text'
return true
if is_space_code n.text.charCodeAt n.text.length - 1
return true
+ return false
# add/remove "white-space: pre[-wrap]" to/from style="" on tags with direct
# child text nodes with multiple spaces in a row, or spaces at the
# start/end.
# text inside child tags are not consulted. Child tags are expected to have
# this function applied to them when their content changes.
adjust_whitespace_style: (n) ->
- if n.type is 'text'
+ loop
+ break if @is_display_block n
n = n.parent
- return unless n?.el?
+ return unless n?
+ return if n is @tree_parent
# which css rule should be used to preserve spaces (should we need to)
style = @iframe.contentWindow.getComputedStyle n.el, null
ws = style.getPropertyValue 'white-space'
return false
# after calling this, you MUST call changed() and adjust_whitespace_style()
insert_character: (n, i, char) ->
- return if @cursor.n.parent is @tree_parent # FIXME implement text nodes at top level
- parent = @cursor.n.parent
+ return if n.parent is @tree_parent # FIXME implement text nodes at top level
# insert the character
if @insert_should_replace n, i
n.text = char
char +
n.text.substr(i)
n.el.nodeValue = n.text
- # after calling this, you MUST call changed() and adjust_whitespace_style()
+ # WARNING: after calling this, you MUST call changed() and adjust_whitespace_style()
remove_character: (n, i) ->
n.text = n.text.substr(0, i) + n.text.substr(i + 1)
n.el.nodeValue = n.text
+ # call this after you insert or remove inline nodes. It will:
+ # merge consecutive text nodes
+ # remove empty text nodes
+ # adjust white-space property
+ text_cleanup: (n) ->
+ return
+ # FIXME implement this
+ # WARNING: after calling this one or more times, you MUST:
+ # if it's inline: call @text_cleanup
+ # call @changed()
+ remove_node: (n) ->
+ i = n.parent.children.indexOf n
+ if i is -1
+ throw "BUG #9187112313"
+ n.el.parentNode.removeChild n.el
+ n.parent.children.splice i, 1
+ return
+ # remove a node from the tree/dom, insert into new_parent before insert_before?end
+ # WARNING: after calling this one or more times, you MUST:
+ # if it's inline: call @text_cleanup
+ # call @changed()
+ move_node: (n, new_parent, insert_before = null) ->
+ i = n.parent.children.indexOf n
+ if i is -1
+ throw "Error: tried to remove node, but it's not in it's parents list of children"
+ return
+ if insert_before?
+ before_i = new_parent.children.indexOf insert_before
+ if i is -1
+ throw "Error: tried to move a node to be before a non-existent node"
+ insert_before = insert_before.el
+ @remove_node n
+ if insert_before?
+ new_parent.el.insertBefore n.el, insert_before
+ new_parent.children.splice before_i, 0, n
+ else
+ new_parent.el.appendChild n.el, insert_before
+ new_parent.children.push n
+ n.parent = new_parent
+ return
kill_cursor: -> # remove it, forget where it was
if @cursor_visible
@cursor_el.parentNode.removeChild @cursor_el
@cursor_visible = false
@cursor = null
@annotate null
+ return
move_cursor: (cursor) ->
@cursor_ideal_x = cursor.x
@cursor = cursor
@cursor_el.style.height = "#{Math.round height * 0.82}px"
@annotate cursor.n
@scroll_into_view cursor.y, height
+ return
scroll_into_view: (y, h = 0) ->
y += overlay_padding # convert units from @idoc to @wrap2
# very top of document
Got questions, comments, patches, etc.? Contact Jason Woofenden