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121 lines
4.2 KiB
CoffeeScript
121 lines
4.2 KiB
CoffeeScript
RegionStyleProperties = ['top', 'left', 'right', 'width', 'height']
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SpaceRegex = /\s+/
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module.exports =
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class HighlightsComponent
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oldState: null
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constructor: (@domElementPool) ->
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@highlightNodesById = {}
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@regionNodesByHighlightId = {}
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@domNode = @domElementPool.build("div", "highlights")
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getDomNode: ->
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@domNode
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updateSync: (state) ->
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newState = state.highlights
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@oldState ?= {}
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# remove highlights
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for id of @oldState
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unless newState[id]?
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@highlightNodesById[id].remove()
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delete @highlightNodesById[id]
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delete @regionNodesByHighlightId[id]
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delete @oldState[id]
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# add or update highlights
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for id, highlightState of newState
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unless @oldState[id]?
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highlightNode = @domElementPool.build("div", "highlight")
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@highlightNodesById[id] = highlightNode
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@regionNodesByHighlightId[id] = {}
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@domNode.appendChild(highlightNode)
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@updateHighlightNode(id, highlightState)
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return
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updateHighlightNode: (id, newHighlightState) ->
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highlightNode = @highlightNodesById[id]
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oldHighlightState = (@oldState[id] ?= {regions: [], flashCount: 0})
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# update class
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if newHighlightState.class isnt oldHighlightState.class
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if oldHighlightState.class?
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if SpaceRegex.test(oldHighlightState.class)
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highlightNode.classList.remove(oldHighlightState.class.split(SpaceRegex)...)
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else
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highlightNode.classList.remove(oldHighlightState.class)
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if SpaceRegex.test(newHighlightState.class)
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highlightNode.classList.add(newHighlightState.class.split(SpaceRegex)...)
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else
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highlightNode.classList.add(newHighlightState.class)
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oldHighlightState.class = newHighlightState.class
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@updateHighlightRegions(id, newHighlightState)
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@flashHighlightNodeIfRequested(id, newHighlightState)
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updateHighlightRegions: (id, newHighlightState) ->
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oldHighlightState = @oldState[id]
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highlightNode = @highlightNodesById[id]
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# remove regions
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while oldHighlightState.regions.length > newHighlightState.regions.length
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oldHighlightState.regions.pop()
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@regionNodesByHighlightId[id][oldHighlightState.regions.length].remove()
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delete @regionNodesByHighlightId[id][oldHighlightState.regions.length]
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# add or update regions
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for newRegionState, i in newHighlightState.regions
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unless oldHighlightState.regions[i]?
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oldHighlightState.regions[i] = {}
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regionNode = @domElementPool.build("div", "region")
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# This prevents highlights at the tiles boundaries to be hidden by the
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# subsequent tile. When this happens, subpixel anti-aliasing gets
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# disabled.
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regionNode.style.boxSizing = "border-box"
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regionNode.classList.add(newHighlightState.deprecatedRegionClass) if newHighlightState.deprecatedRegionClass?
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@regionNodesByHighlightId[id][i] = regionNode
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highlightNode.appendChild(regionNode)
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oldRegionState = oldHighlightState.regions[i]
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regionNode = @regionNodesByHighlightId[id][i]
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for property in RegionStyleProperties
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if newRegionState[property] isnt oldRegionState[property]
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oldRegionState[property] = newRegionState[property]
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if newRegionState[property]?
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regionNode.style[property] = newRegionState[property] + 'px'
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else
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regionNode.style[property] = ''
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return
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flashHighlightNodeIfRequested: (id, newHighlightState) ->
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oldHighlightState = @oldState[id]
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return unless newHighlightState.flashCount > oldHighlightState.flashCount
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highlightNode = @highlightNodesById[id]
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addFlashClass = =>
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highlightNode.classList.add(newHighlightState.flashClass)
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oldHighlightState.flashClass = newHighlightState.flashClass
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@flashTimeoutId = setTimeout(removeFlashClass, newHighlightState.flashDuration)
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removeFlashClass = =>
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highlightNode.classList.remove(oldHighlightState.flashClass)
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oldHighlightState.flashClass = null
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clearTimeout(@flashTimeoutId)
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if oldHighlightState.flashClass?
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removeFlashClass()
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requestAnimationFrame(addFlashClass)
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else
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addFlashClass()
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oldHighlightState.flashCount = newHighlightState.flashCount
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