neft

# Image ```javascript Image { source: 'http://lorempixel.com/200/140/' onLoad: function(error){ if (error){ console.error("Can't load this image"); } else { console.log("Image has been loaded"); } } } ``` 'use strict' assert = require 'src/assert' signal = require 'src/signal' log = require 'src/log' utils = require 'src/utils' Resources = require 'src/resources' log = log.scope 'Renderer', 'Image' module.exports = (Renderer, Impl, itemUtils) -> class Image extends Renderer.Item @__name__ = 'Image' @__path__ = 'Renderer.Image' ## *Image* Image.New([*Object* options]) @New = (opts) -> item = new Image itemUtils.Object.initialize item, opts item ## *Image* Image::constructor() : *Item* constructor: -> super() @_source = '' @_loaded = false @_resolution = 1 @_sourceWidth = 0 @_sourceHeight = 0 @_autoWidth = true @_autoHeight = true @_width = -1 @_height = -1 ## *Float* Image.pixelRatio = `1` ## *Signal* Image.onPixelRatioChange(*Float* oldValue) signal.create @, 'onPixelRatioChange' pixelRatio = 1 utils.defineProperty @, 'pixelRatio', utils.CONFIGURABLE, -> pixelRatio , (val) -> assert.isFloat val, "Image.pixelRatio needs to be a float, but #{val} given" if val is pixelRatio return oldVal = pixelRatio pixelRatio = val @onPixelRatioChange.emit oldVal ## *Float* Image::width = `-1` updateSize = -> if @_autoHeight is @_autoWidth return if @_autoHeight itemHeightSetter.call @, @_width / @sourceWidth * @sourceHeight or 0 if @_autoWidth itemWidthSetter.call @, @_height / @sourceHeight * @sourceWidth or 0 return _width: -1 getter = utils.lookupGetter @::, 'width' itemWidthSetter = utils.lookupSetter @::, 'width' utils.defineProperty @::, 'width', null, getter, do (_super = itemWidthSetter) -> (val) -> @_autoWidth = val is -1 _super.call @, val updateSize.call @ return ## *Float* Image::height = `-1` _height: -1 getter = utils.lookupGetter @::, 'height' itemHeightSetter = utils.lookupSetter @::, 'height' utils.defineProperty @::, 'height', null, getter, do (_super = itemHeightSetter) -> (val) -> @_autoHeight = val is -1 _super.call @, val updateSize.call @ return ## *String* Image::source The image source URL or data URI. ## *Signal* Image::onSourceChange(*String* oldValue) itemUtils.defineProperty constructor: @ name: 'source' defaultValue: '' developmentSetter: (val) -> assert.isString val, "Image.source needs to be a string, but #{val} given" setter: do -> RESOURCE_REQUEST = resolution: 1 defaultResult = source: '' width: 0 height: 0 setSize = (size) -> assert.isFloat size.width assert.isFloat size.height itemUtils.setPropertyValue @, 'sourceWidth', size.width itemUtils.setPropertyValue @, 'sourceHeight', size.height if @_autoWidth itemWidthSetter.call @, size.width if @_autoHeight itemHeightSetter.call @, size.height updateSize.call @ return loadCallback = (err = null, opts) -> if err log.warn "Can't load '#{@source}' image at #{@toString()}" else assert.isString opts.source if @sourceWidth is 0 or @sourceHeight is 0 setSize.call @, opts else itemUtils.setPropertyValue @, 'resolution', opts.width / @sourceWidth @_loaded = true @onLoadedChange.emit false if err @onError.emit err else @onLoad.emit() return (_super) -> (val) -> _super.call @, val if @_loaded @_loaded = false @onLoadedChange.emit true itemUtils.setPropertyValue @, 'sourceWidth', 0 itemUtils.setPropertyValue @, 'sourceHeight', 0 itemUtils.setPropertyValue @, 'resolution', 1 if Resources.testUri(val) if res = Impl.resources?.getResource(val) resolution = Renderer.Device.pixelRatio * Image.pixelRatio RESOURCE_REQUEST.resolution = resolution val = res.resolve RESOURCE_REQUEST setSize.call @, res else log.warn "Unknown resource given '#{val}'" val = '' if val Impl.setImageSource.call @, val, loadCallback else Impl.setImageSource.call @, null, null defaultResult.source = val loadCallback.call @, null, defaultResult return ## ReadOnly *Float* Image::resolution = `1` itemUtils.defineProperty constructor: @ name: 'resolution' defaultValue: 1 setter: (_super) -> -> ## ReadOnly *Float* Image::sourceWidth = `0` ## *Signal* Image::onSourceWidthChange(*Float* oldValue) itemUtils.defineProperty constructor: @ name: 'sourceWidth' defaultValue: 0 setter: (_super) -> -> ## ReadOnly *Float* Image::sourceHeight = `0` ## *Signal* Image::onSourceHeightChange(*Float* oldValue) itemUtils.defineProperty constructor: @ name: 'sourceHeight' defaultValue: 0 setter: (_super) -> -> ## ReadOnly *Boolean* Image::loaded = `false` utils.defineProperty @::, 'loaded', null, -> @_loaded , null ## *Signal* Image::onLoadedChange(*Boolean* oldValue) signal.Emitter.createSignal @, 'onLoadedChange' ## *Signal* Image::onLoad() signal.Emitter.createSignal @, 'onLoad' ## *Signal* Image::onError(*Error* error) signal.Emitter.createSignal @, 'onError'