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Rewrite LinesTileComponent in JavaScript
This commit is contained in:
Antonio Scandurra
348
src/lines-tile-component.js
Normal file
348
src/lines-tile-component.js
Normal file
@@ -0,0 +1,348 @@
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const HighlightsComponent = require('./highlights-component')
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const ZERO_WIDTH_NBSP = '\ufeff'
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module.exports = class LinesTileComponent {
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constructor ({presenter, id, domElementPool, assert}) {
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this.presenter = presenter
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this.id = id
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this.domElementPool = domElementPool
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this.assert = assert
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this.measuredLines = new Set()
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this.lineNodesByLineId = {}
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this.screenRowsByLineId = {}
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this.lineIdsByScreenRow = {}
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this.textNodesByLineId = {}
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this.insertionPointsBeforeLineById = {}
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this.insertionPointsAfterLineById = {}
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this.domNode = this.domElementPool.buildElement('div')
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this.domNode.style.position = 'absolute'
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this.domNode.style.display = 'block'
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this.highlightsComponent = new HighlightsComponent(this.domElementPool)
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this.domNode.appendChild(this.highlightsComponent.getDomNode())
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}
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destroy () {
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this.domElementPool.freeElementAndDescendants(this.domNode)
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}
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getDomNode () {
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return this.domNode
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}
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updateSync (state) {
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this.newState = state
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if (this.oldState == null) {
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this.oldState = {tiles: {}}
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this.oldState.tiles[this.id] = {lines: {}}
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}
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this.newTileState = this.newState.tiles[this.id]
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this.oldTileState = this.oldState.tiles[this.id]
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if (this.newState.backgroundColor !== this.oldState.backgroundColor) {
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this.domNode.style.backgroundColor = this.newState.backgroundColor
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this.oldState.backgroundColor = this.newState.backgroundColor
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}
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if (this.newTileState.zIndex !== this.oldTileState.zIndex) {
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this.domNode.style.zIndex = this.newTileState.zIndex
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this.oldTileState.zIndex = this.newTileState.zIndex
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}
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if (this.newTileState.display !== this.oldTileState.display) {
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this.domNode.style.display = this.newTileState.display
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this.oldTileState.display = this.newTileState.display
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}
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if (this.newTileState.height !== this.oldTileState.height) {
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this.domNode.style.height = this.newTileState.height + 'px'
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this.oldTileState.height = this.newTileState.height
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}
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if (this.newState.width !== this.oldState.width) {
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this.domNode.style.width = this.newState.width + 'px'
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this.oldTileState.width = this.newTileState.width
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}
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if (this.newTileState.top !== this.oldTileState.top || this.newTileState.left !== this.oldTileState.left) {
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this.domNode.style.transform = `translate3d(${this.newTileState.left}px, ${this.newTileState.top}px, 0px)`
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this.oldTileState.top = this.newTileState.top
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this.oldTileState.left = this.newTileState.left
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}
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this.updateLineNodes()
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this.highlightsComponent.updateSync(this.newTileState)
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}
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removeLineNodes () {
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for (const id of Object.keys(this.oldTileState.lines)) {
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this.removeLineNode(id)
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}
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}
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removeLineNode (id) {
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this.domElementPool.freeElementAndDescendants(this.lineNodesByLineId[id])
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this.removeBlockDecorationInsertionPointBeforeLine(id)
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this.removeBlockDecorationInsertionPointAfterLine(id)
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delete this.lineNodesByLineId[id]
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delete this.textNodesByLineId[id]
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delete this.lineIdsByScreenRow[this.screenRowsByLineId[id]]
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delete this.screenRowsByLineId[id]
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delete this.oldTileState.lines[id]
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}
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updateLineNodes () {
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for (const id of Object.keys(this.oldTileState.lines)) {
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if (!this.newTileState.lines.hasOwnProperty(id)) {
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this.removeLineNode(id)
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}
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}
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const newLineIds = []
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const newLineNodes = []
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for (const id of Object.keys(this.newTileState.lines)) {
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const lineState = this.newTileState.lines[id]
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if (this.oldTileState.lines.hasOwnProperty(id)) {
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this.updateLineNode(id)
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} else {
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newLineIds.push(id)
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newLineNodes.push(this.buildLineNode(id))
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this.screenRowsByLineId[id] = lineState.screenRow
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this.lineIdsByScreenRow[lineState.screenRow] = id
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this.oldTileState.lines[id] = Object.assign({}, lineState)
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}
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}
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while (newLineIds.length > 0) {
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const id = newLineIds.shift()
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const lineNode = newLineNodes.shift()
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this.lineNodesByLineId[id] = lineNode
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const nextNode = this.findNodeNextTo(lineNode)
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if (nextNode == null) {
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this.domNode.appendChild(lineNode)
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} else {
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this.domNode.insertBefore(lineNode, nextNode)
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}
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this.insertBlockDecorationInsertionPointBeforeLine(id)
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this.insertBlockDecorationInsertionPointAfterLine(id)
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}
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}
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removeBlockDecorationInsertionPointBeforeLine (id) {
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const insertionPoint = this.insertionPointsBeforeLineById[id]
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if (insertionPoint != null) {
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this.domElementPool.freeElementAndDescendants(insertionPoint)
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delete this.insertionPointsBeforeLineById[id]
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}
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}
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insertBlockDecorationInsertionPointBeforeLine (id) {
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const {hasPrecedingBlockDecorations, screenRow} = this.newTileState.lines[id]
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if (hasPrecedingBlockDecorations) {
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const lineNode = this.lineNodesByLineId[id]
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const insertionPoint = this.domElementPool.buildElement('content')
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this.domNode.insertBefore(insertionPoint, lineNode)
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this.insertionPointsBeforeLineById[id] = insertionPoint
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insertionPoint.dataset.screenRow = screenRow
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this.updateBlockDecorationInsertionPointBeforeLine(id)
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}
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}
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updateBlockDecorationInsertionPointBeforeLine (id) {
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const oldLineState = this.oldTileState.lines[id]
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const newLineState = this.newTileState.lines[id]
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const insertionPoint = this.insertionPointsBeforeLineById[id]
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if (insertionPoint != null) {
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if (newLineState.screenRow !== oldLineState.screenRow) {
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insertionPoint.dataset.screenRow = newLineState.screenRow
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}
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const precedingBlockDecorationsSelector = newLineState.precedingBlockDecorations
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.map((d) => `.atom--block-decoration-${d.id}`)
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.join(',')
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if (precedingBlockDecorationsSelector !== oldLineState.precedingBlockDecorationsSelector) {
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insertionPoint.setAttribute('select', precedingBlockDecorationsSelector)
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oldLineState.precedingBlockDecorationsSelector = precedingBlockDecorationsSelector
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}
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}
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}
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removeBlockDecorationInsertionPointAfterLine (id) {
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const insertionPoint = this.insertionPointsAfterLineById[id]
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if (insertionPoint != null) {
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this.domElementPool.freeElementAndDescendants(insertionPoint)
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delete this.insertionPointsAfterLineById[id]
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}
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}
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insertBlockDecorationInsertionPointAfterLine (id) {
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const {hasFollowingBlockDecorations, screenRow} = this.newTileState.lines[id]
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if (hasFollowingBlockDecorations) {
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const lineNode = this.lineNodesByLineId[id]
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const insertionPoint = this.domElementPool.buildElement('content')
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this.domNode.insertBefore(insertionPoint, lineNode.nextSibling)
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this.insertionPointsAfterLineById[id] = insertionPoint
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insertionPoint.dataset.screenRow = screenRow
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this.updateBlockDecorationInsertionPointAfterLine(id)
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}
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}
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updateBlockDecorationInsertionPointAfterLine (id) {
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const oldLineState = this.oldTileState.lines[id]
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const newLineState = this.newTileState.lines[id]
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const insertionPoint = this.insertionPointsAfterLineById[id]
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if (insertionPoint != null) {
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if (newLineState.screenRow !== oldLineState.screenRow) {
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insertionPoint.dataset.screenRow = newLineState.screenRow
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}
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const followingBlockDecorationsSelector = newLineState.followingBlockDecorations
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.map((d) => `.atom--block-decoration-${d.id}`)
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.join(',')
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if (followingBlockDecorationsSelector !== oldLineState.followingBlockDecorationsSelector) {
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insertionPoint.setAttribute('select', followingBlockDecorationsSelector)
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oldLineState.followingBlockDecorationsSelector = followingBlockDecorationsSelector
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}
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}
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}
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findNodeNextTo (node) {
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let i = 1 // skip highlights node
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while (i < this.domNode.children.length) {
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const nextNode = this.domNode.children[i]
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if (this.screenRowForNode(node) < this.screenRowForNode(nextNode)) {
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return nextNode
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}
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i++
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}
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return null
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}
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screenRowForNode (node) {
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return parseInt(node.dataset.screenRow)
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}
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buildLineNode (id) {
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const {lineText, tagCodes, screenRow, decorationClasses} = this.newTileState.lines[id]
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const lineNode = this.domElementPool.buildElement('div', 'line')
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lineNode.dataset.screenRow = screenRow
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if (decorationClasses != null) {
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for (const decorationClass of decorationClasses) {
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lineNode.classList.add(decorationClass)
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}
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}
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const textNodes = []
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let startIndex = 0
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let openScopeNode = lineNode
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for (const tagCode of tagCodes) {
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if (tagCode !== 0) {
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if (this.presenter.isCloseTagCode(tagCode)) {
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openScopeNode = openScopeNode.parentElement
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} else if (this.presenter.isOpenTagCode(tagCode)) {
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const scope = this.presenter.tagForCode(tagCode)
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const newScopeNode = this.domElementPool.buildElement('span', scope.replace(/\.+/g, ' '))
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openScopeNode.appendChild(newScopeNode)
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openScopeNode = newScopeNode
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} else {
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const textNode = this.domElementPool.buildText(lineText.substr(startIndex, tagCode))
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startIndex += tagCode
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openScopeNode.appendChild(textNode)
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textNodes.push(textNode)
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}
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}
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}
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if (startIndex === 0) {
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const textNode = this.domElementPool.buildText(' ')
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lineNode.appendChild(textNode)
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textNodes.push(textNode)
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}
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if (lineText.endsWith(this.presenter.displayLayer.foldCharacter)) {
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const textNode = this.domElementPool.buildText(ZERO_WIDTH_NBSP)
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lineNode.appendChild(textNode)
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textNodes.push(textNode)
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}
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this.textNodesByLineId[id] = textNodes
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return lineNode
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}
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updateLineNode (id) {
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const oldLineState = this.oldTileState.lines[id]
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const newLineState = this.newTileState.lines[id]
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const lineNode = this.lineNodesByLineId[id]
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const newDecorationClasses = newLineState.decorationClasses
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const oldDecorationClasses = oldLineState.decorationClasses
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if (oldDecorationClasses != null) {
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for (const decorationClass of oldDecorationClasses) {
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if (newDecorationClasses == null || !newDecorationClasses.includes(decorationClass)) {
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lineNode.classList.remove(decorationClass)
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}
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}
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}
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if (newDecorationClasses != null) {
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for (const decorationClass of newDecorationClasses) {
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if (oldDecorationClasses == null || !oldDecorationClasses.includes(decorationClass)) {
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lineNode.classList.add(decorationClass)
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}
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}
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}
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oldLineState.decorationClasses = newLineState.decorationClasses
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if (!oldLineState.hasPrecedingBlockDecorations && newLineState.hasPrecedingBlockDecorations) {
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this.insertBlockDecorationInsertionPointBeforeLine(id)
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} else if (oldLineState.hasPrecedingBlockDecorations && !newLineState.hasPrecedingBlockDecorations) {
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this.removeBlockDecorationInsertionPointBeforeLine(id)
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}
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if (!oldLineState.hasFollowingBlockDecorations && newLineState.hasFollowingBlockDecorations) {
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this.insertBlockDecorationInsertionPointAfterLine(id)
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} else if (oldLineState.hasFollowingBlockDecorations && !newLineState.hasFollowingBlockDecorations) {
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this.removeBlockDecorationInsertionPointAfterLine(id)
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}
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if (newLineState.screenRow !== oldLineState.screenRow) {
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lineNode.dataset.screenRow = newLineState.screenRow
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this.lineIdsByScreenRow[newLineState.screenRow] = id
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this.screenRowsByLineId[id] = newLineState.screenRow
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}
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this.updateBlockDecorationInsertionPointBeforeLine(id)
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this.updateBlockDecorationInsertionPointAfterLine(id)
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oldLineState.screenRow = newLineState.screenRow
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oldLineState.hasPrecedingBlockDecorations = newLineState.hasPrecedingBlockDecorations
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oldLineState.hasFollowingBlockDecorations = newLineState.hasFollowingBlockDecorations
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}
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lineNodeForScreenRow (screenRow) {
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return this.lineNodesByLineId[this.lineIdsByScreenRow[screenRow]]
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}
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lineNodeForLineId (lineId) {
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return this.lineNodesByLineId[lineId]
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}
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textNodesForLineId (lineId) {
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return this.textNodesByLineId[lineId].slice()
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}
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lineIdForScreenRow (screenRow) {
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return this.lineIdsByScreenRow[screenRow]
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}
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textNodesForScreenRow (screenRow) {
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const textNodes = this.textNodesByLineId[this.lineIdsByScreenRow[screenRow]]
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if (textNodes == null) {
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return null
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} else {
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return textNodes.slice()
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}
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}
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}
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