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atom/src/styles-element.js at master · torwei/atom · GitHub
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styles-element.js
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atom
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styles-element.js
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const
{
Emitter
,
CompositeDisposable
}
=
require
(
'event-kit'
)
;
class
StylesElement
extends
HTMLElement
{
constructor
(
)
{
super
(
)
;
this
.
subscriptions
=
new
CompositeDisposable
(
)
;
this
.
emitter
=
new
Emitter
(
)
;
this
.
styleElementClonesByOriginalElement
=
new
WeakMap
(
)
;
this
.
context
=
null
;
}
onDidAddStyleElement
(
callback
)
{
this
.
emitter
.
on
(
'did-add-style-element'
,
callback
)
;
}
onDidRemoveStyleElement
(
callback
)
{
this
.
emitter
.
on
(
'did-remove-style-element'
,
callback
)
;
}
onDidUpdateStyleElement
(
callback
)
{
this
.
emitter
.
on
(
'did-update-style-element'
,
callback
)
;
}
connectedCallback
(
)
{
let
left
;
this
.
context
=
(
left
=
this
.
getAttribute
(
'context'
)
)
!=
null
?
left
:
undefined
;
}
disconnectedCallback
(
)
{
this
.
subscriptions
.
dispose
(
)
;
this
.
subscriptions
=
new
CompositeDisposable
(
)
;
}
static
get
observedAttributes
(
)
{
return
[
'context'
]
;
}
attributeChangedCallback
(
attrName
)
{
if
(
attrName
===
'context'
)
{
return
this
.
contextChanged
(
)
;
}
}
initialize
(
styleManager
)
{
this
.
styleManager
=
styleManager
;
if
(
this
.
styleManager
==
null
)
{
throw
new
Error
(
'Must pass a styleManager parameter when initializing a StylesElement'
)
;
}
this
.
subscriptions
.
add
(
this
.
styleManager
.
observeStyleElements
(
this
.
styleElementAdded
.
bind
(
this
)
)
)
;
this
.
subscriptions
.
add
(
this
.
styleManager
.
onDidRemoveStyleElement
(
this
.
styleElementRemoved
.
bind
(
this
)
)
)
;
this
.
subscriptions
.
add
(
this
.
styleManager
.
onDidUpdateStyleElement
(
this
.
styleElementUpdated
.
bind
(
this
)
)
)
;
}
contextChanged
(
)
{
if
(
this
.
subscriptions
==
null
)
{
return
;
}
for
(
let
child
of
Array
.
from
(
Array
.
prototype
.
slice
.
call
(
this
.
children
)
)
)
{
this
.
styleElementRemoved
(
child
)
;
}
this
.
context
=
this
.
getAttribute
(
'context'
)
;
for
(
let
styleElement
of
Array
.
from
(
this
.
styleManager
.
getStyleElements
(
)
)
)
{
this
.
styleElementAdded
(
styleElement
)
;
}
}
styleElementAdded
(
styleElement
)
{
let
insertBefore
;
if
(
!
this
.
styleElementMatchesContext
(
styleElement
)
)
{
return
;
}
const
styleElementClone
=
styleElement
.
cloneNode
(
true
)
;
styleElementClone
.
sourcePath
=
styleElement
.
sourcePath
;
styleElementClone
.
context
=
styleElement
.
context
;
styleElementClone
.
priority
=
styleElement
.
priority
;
this
.
styleElementClonesByOriginalElement
.
set
(
styleElement
,
styleElementClone
)
;
const
{
priority
}
=
styleElement
;
if
(
priority
!=
null
)
{
for
(
let
child
of
this
.
children
)
{
if
(
child
.
priority
>
priority
)
{
insertBefore
=
child
;
break
;
}
}
}
this
.
insertBefore
(
styleElementClone
,
insertBefore
)
;
this
.
emitter
.
emit
(
'did-add-style-element'
,
styleElementClone
)
;
}
styleElementRemoved
(
styleElement
)
{
let
left
;
if
(
!
this
.
styleElementMatchesContext
(
styleElement
)
)
{
return
;
}
const
styleElementClone
=
(
left
=
this
.
styleElementClonesByOriginalElement
.
get
(
styleElement
)
)
!=
null
?
left
:
styleElement
;
styleElementClone
.
remove
(
)
;
this
.
emitter
.
emit
(
'did-remove-style-element'
,
styleElementClone
)
;
}
styleElementUpdated
(
styleElement
)
{
if
(
!
this
.
styleElementMatchesContext
(
styleElement
)
)
{
return
;
}
const
styleElementClone
=
this
.
styleElementClonesByOriginalElement
.
get
(
styleElement
)
;
styleElementClone
.
textContent
=
styleElement
.
textContent
;
this
.
emitter
.
emit
(
'did-update-style-element'
,
styleElementClone
)
;
}
styleElementMatchesContext
(
styleElement
)
{
return
this
.
context
==
null
||
styleElement
.
context
===
this
.
context
;
}
}
window
.
customElements
.
define
(
'atom-styles'
,
StylesElement
)
;
function
createStylesElement
(
)
{
return
document
.
createElement
(
'atom-styles'
)
;
}
module
.
exports
=
{
createStylesElement
}
;
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