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51 lines
1.3 KiB
CoffeeScript
51 lines
1.3 KiB
CoffeeScript
Point = require 'point'
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module.exports =
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class Anchor
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editor: null
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bufferPosition: null
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screenPosition: null
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constructor: (editor, screenPosition) ->
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@editor = editor
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if screenPosition
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@setScreenPosition(screenPosition)
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else
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@bufferPosition = new Point(0,0)
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@screenPosition = new Point(0,0)
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handleBufferChange: (e) ->
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{ oldRange, newRange } = e
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position = @getBufferPosition()
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return if position.isLessThan(oldRange.end)
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newRow = newRange.end.row
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newColumn = newRange.end.column
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if position.row == oldRange.end.row
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newColumn += position.column - oldRange.end.column
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else
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newColumn = position.column
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newRow += position.row - oldRange.end.row
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@setBufferPosition [newRow, newColumn]
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getBufferPosition: ->
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@bufferPosition
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setBufferPosition: (position) ->
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screenPosition = @editor.screenPositionForBufferPosition(position)
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@setScreenPosition(screenPosition, clip: false)
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getScreenPosition: ->
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@screenPosition
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setScreenPosition: (position, options={}) ->
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position = Point.fromObject(position)
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clip = options.clip ? true
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@screenPosition = if clip then @editor.clipScreenPosition(position) else position
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@bufferPosition = @editor.bufferPositionForScreenPosition(position)
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Object.freeze @screenPosition
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Object.freeze @bufferPosition |