neft/src/renderer/impl/base/level1/binding.coffee

Universal Platform

'use strict'

Binding = require 'src/binding'

module.exports = (impl) ->

    class RendererBinding extends Binding
        pool = []

        @factory = (obj, prop, binding, component, ctx) ->
            if elem = pool.pop()
                RendererBinding.call elem, obj, prop, binding, component, ctx
            RendererBinding.New obj, prop, binding, component, ctx, elem

        @New = (obj, prop, binding, component, ctx, target) ->
            target ?= new RendererBinding obj, prop, binding, component, ctx
            Binding.New binding, ctx, target
            target.update()
            target

        onComponentObjectChange = (id) ->
            for conn in @connections
                while conn.child
                    conn = conn.child
                if conn.itemId is id
                    conn.updateItem()
            return

        constructor: (@obj, @prop, binding, component, ctx) ->
            super binding, ctx
            @component = component
            @args = component.objectsOrder

            if @listensOnComponentObjectChange = @component.onObjectChange?
                @component.onObjectChange onComponentObjectChange, @

        getItemById: (item) ->
            if item is 'this'
                @ctx
            else if item is 'view'
                impl.Renderer.window
            else
                @component.objects[item] or impl.Renderer[item] or null

        getValue: ->
            @obj[@prop]

        setValue: (val) ->
            if not val? or val isnt val
                val = @getDefaultValue()
            @obj[@prop] = val
            return

        getLoopDetectedErrorMessage: ->
            "Potential loop detected. Property binding '#{@prop}' on '#{@item.toString()}' has been disabled."

        destroy: ->
            # remove from the list
            @obj._impl.bindings[@prop] = null

            if @listensOnComponentObjectChange
                @component.onObjectChange.disconnect onComponentObjectChange, @

            super()

            pool.push @
            return

    setItemBinding: (prop, binding, component, ctx) ->
        data = @_impl
        data.bindings ?= {}

        data.bindings[prop]?.destroy()

        if binding?
            data.bindings[prop] = RendererBinding.factory @, prop, binding, component, ctx

        return