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46 lines
1.9 KiB
CoffeeScript
46 lines
1.9 KiB
CoffeeScript
module.exports =
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class OverlayManager
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constructor: (@presenter, @container, @views) ->
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@overlaysById = {}
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render: (state) ->
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for decorationId, overlay of state.content.overlays
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if @shouldUpdateOverlay(decorationId, overlay)
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@renderOverlay(state, decorationId, overlay)
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for id, {overlayNode} of @overlaysById
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unless state.content.overlays.hasOwnProperty(id)
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delete @overlaysById[id]
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overlayNode.remove()
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shouldUpdateOverlay: (decorationId, overlay) ->
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cachedOverlay = @overlaysById[decorationId]
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return true unless cachedOverlay?
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cachedOverlay.pixelPosition?.top isnt overlay.pixelPosition?.top or
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cachedOverlay.pixelPosition?.left isnt overlay.pixelPosition?.left
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measureOverlays: ->
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for decorationId, {itemView} of @overlaysById
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@measureOverlay(decorationId, itemView)
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measureOverlay: (decorationId, itemView) ->
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contentMargin = parseInt(getComputedStyle(itemView)['margin-left']) ? 0
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@presenter.setOverlayDimensions(decorationId, itemView.offsetWidth, itemView.offsetHeight, contentMargin)
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renderOverlay: (state, decorationId, {item, pixelPosition, class: klass}) ->
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itemView = @views.getView(item)
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cachedOverlay = @overlaysById[decorationId]
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unless overlayNode = cachedOverlay?.overlayNode
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overlayNode = document.createElement('atom-overlay')
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overlayNode.classList.add(klass) if klass?
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@container.appendChild(overlayNode)
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@overlaysById[decorationId] = cachedOverlay = {overlayNode, itemView}
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# The same node may be used in more than one overlay. This steals the node
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# back if it has been displayed in another overlay.
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overlayNode.appendChild(itemView) if overlayNode.childNodes.length is 0
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cachedOverlay.pixelPosition = pixelPosition
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overlayNode.style.top = pixelPosition.top + 'px'
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overlayNode.style.left = pixelPosition.left + 'px'
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