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111 lines
4.0 KiB
CoffeeScript
111 lines
4.0 KiB
CoffeeScript
{setDimensionsAndBackground} = require './gutter-component-helpers'
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# This class represents a gutter other than the 'line-numbers' gutter.
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# The contents of this gutter may be specified by Decorations.
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module.exports =
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class CustomGutterComponent
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constructor: ({@gutter}) ->
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@decorationNodesById = {}
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@decorationItemsById = {}
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@visible = true
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@domNode = atom.views.getView(@gutter)
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@decorationsNode = @domNode.firstChild
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# Clear the contents in case the domNode is being reused.
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@decorationsNode.innerHTML = ''
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getDomNode: ->
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@domNode
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hideNode: ->
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if @visible
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@domNode.style.display = 'none'
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@visible = false
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showNode: ->
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if not @visible
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@domNode.style.removeProperty('display')
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@visible = true
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# `state` is a subset of the TextEditorPresenter state that is specific
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# to this line number gutter.
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updateSync: (state) ->
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@oldDimensionsAndBackgroundState ?= {}
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setDimensionsAndBackground(@oldDimensionsAndBackgroundState, state.styles, @decorationsNode)
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@oldDecorationPositionState ?= {}
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decorationState = state.content
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updatedDecorationIds = new Set
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for decorationId, decorationInfo of decorationState
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updatedDecorationIds.add(decorationId)
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existingDecoration = @decorationNodesById[decorationId]
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if existingDecoration
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@updateDecorationNode(existingDecoration, decorationId, decorationInfo)
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else
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newNode = @buildDecorationNode(decorationId, decorationInfo)
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@decorationNodesById[decorationId] = newNode
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@decorationsNode.appendChild(newNode)
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for decorationId, decorationNode of @decorationNodesById
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if not updatedDecorationIds.has(decorationId)
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decorationNode.remove()
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delete @decorationNodesById[decorationId]
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delete @decorationItemsById[decorationId]
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delete @oldDecorationPositionState[decorationId]
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###
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Section: Private Methods
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###
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# Builds and returns an HTMLElement to represent the specified decoration.
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buildDecorationNode: (decorationId, decorationInfo) ->
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@oldDecorationPositionState[decorationId] = {}
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newNode = document.createElement('div')
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newNode.style.position = 'absolute'
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@updateDecorationNode(newNode, decorationId, decorationInfo)
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newNode
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# Updates the existing HTMLNode with the new decoration info. Attempts to
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# minimize changes to the DOM.
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updateDecorationNode: (node, decorationId, newDecorationInfo) ->
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oldPositionState = @oldDecorationPositionState[decorationId]
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if oldPositionState.top isnt newDecorationInfo.top + 'px'
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node.style.top = newDecorationInfo.top + 'px'
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oldPositionState.top = newDecorationInfo.top + 'px'
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if oldPositionState.height isnt newDecorationInfo.height + 'px'
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node.style.height = newDecorationInfo.height + 'px'
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oldPositionState.height = newDecorationInfo.height + 'px'
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if newDecorationInfo.class and not node.classList.contains(newDecorationInfo.class)
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node.className = 'decoration'
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node.classList.add(newDecorationInfo.class)
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else if not newDecorationInfo.class
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node.className = 'decoration'
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@setDecorationItem(newDecorationInfo.item, newDecorationInfo.height, decorationId, node)
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# Sets the decorationItem on the decorationNode.
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# If `decorationItem` is undefined, the decorationNode's child item will be cleared.
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setDecorationItem: (newItem, decorationHeight, decorationId, decorationNode) ->
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if newItem isnt @decorationItemsById[decorationId]
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while decorationNode.firstChild
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decorationNode.removeChild(decorationNode.firstChild)
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delete @decorationItemsById[decorationId]
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if newItem
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# `item` should be either an HTMLElement or a space-pen View.
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newItemNode = null
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if newItem instanceof HTMLElement
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newItemNode = newItem
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else
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newItemNode = newItem.element
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newItemNode.style.height = decorationHeight + 'px'
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decorationNode.appendChild(newItemNode)
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@decorationItemsById[decorationId] = newItem
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