atom/src/lines-component.coffee at master · jforge/atom · GitHub

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{$$} = require 'space-pen'

CursorsComponent = require './cursors-component'

TileComponent = require './tile-component'

DummyLineNode = $$(-> @div className: 'line', style: 'position: absolute; visibility: hidden;', => @span 'x')[0]

cloneObject = (object) ->

clone = {}

clone[key] = value for key, value of object

clone

module.exports =

class LinesComponent

placeholderTextDiv: null

constructor: ({@presenter, @hostElement, @useShadowDOM, visible}) ->

@tileComponentsByTileId = {}

@domNode = document.createElement('div')

@domNode.classList.add('lines')

@cursorsComponent = new CursorsComponent(@presenter)

@domNode.appendChild(@cursorsComponent.getDomNode())

if @useShadowDOM

insertionPoint = document.createElement('content')

insertionPoint.setAttribute('select', '.overlayer')

@domNode.appendChild(insertionPoint)

getDomNode: ->

@domNode

updateSync: (state) ->

@newState = state.content

@oldState ?= {tiles: {}}

if @newState.scrollHeight isnt @oldState.scrollHeight

@domNode.style.height = @newState.scrollHeight + 'px'

@oldState.scrollHeight = @newState.scrollHeight

if @newState.backgroundColor isnt @oldState.backgroundColor

@domNode.style.backgroundColor = @newState.backgroundColor

@oldState.backgroundColor = @newState.backgroundColor

if @newState.placeholderText isnt @oldState.placeholderText

@placeholderTextDiv?.remove()

if @newState.placeholderText?

@placeholderTextDiv = document.createElement('div')

@placeholderTextDiv.classList.add('placeholder-text')

@placeholderTextDiv.textContent = @newState.placeholderText

@domNode.appendChild(@placeholderTextDiv)

@removeTileNodes() unless @oldState.indentGuidesVisible is @newState.indentGuidesVisible

@updateTileNodes()

if @newState.width isnt @oldState.width

@domNode.style.width = @newState.width + 'px'

@cursorsComponent.updateSync(state)

@oldState.indentGuidesVisible = @newState.indentGuidesVisible

@oldState.scrollWidth = @newState.scrollWidth

@oldState.width = @newState.width

removeTileNodes: ->

@removeTileNode(id) for id of @oldState.tiles

return

removeTileNode: (id) ->

node = @tileComponentsByTileId[id].getDomNode()

node.remove()

delete @tileComponentsByTileId[id]

delete @oldState.tiles[id]

updateTileNodes: ->

for id of @oldState.tiles

unless @newState.tiles.hasOwnProperty(id)

@removeTileNode(id)

for id, tileState of @newState.tiles

if @oldState.tiles.hasOwnProperty(id)

tileComponent = @tileComponentsByTileId[id]

else

tileComponent = @tileComponentsByTileId[id] = new TileComponent({id, @presenter})

@domNode.appendChild(tileComponent.getDomNode())

@oldState.tiles[id] = cloneObject(tileState)

tileComponent.updateSync(@newState)

return

measureLineHeightAndDefaultCharWidth: ->

@domNode.appendChild(DummyLineNode)

lineHeightInPixels = DummyLineNode.getBoundingClientRect().height

charWidth = DummyLineNode.firstChild.getBoundingClientRect().width

@domNode.removeChild(DummyLineNode)

@presenter.setLineHeight(lineHeightInPixels)

@presenter.setBaseCharacterWidth(charWidth)

remeasureCharacterWidths: ->

return unless @presenter.baseCharacterWidth

@clearScopedCharWidths()

@measureCharactersInNewLines()

measureCharactersInNewLines: ->

@presenter.batchCharacterMeasurement =>

for id, component of @tileComponentsByTileId

component.measureCharactersInNewLines()

return

clearScopedCharWidths: ->

for id, component of @tileComponentsByTileId

component.clearMeasurements()

@presenter.clearScopedCharacterWidths()

lineNodeForScreenRow: (screenRow) ->

tile = @presenter.tileForRow(screenRow)

@tileComponentsByTileId[tile]?.lineNodeForScreenRow(screenRow)

atom/src/lines-component.coffee at master · jforge/atom · GitHub

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