all files / lib/src/instance/methods/ reveal.js

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import style from '../functions/style'
import initialize from '../functions/initialize'
 
import { getNode, getNodes, logger } from '../../utils/core'
import { deepAssign, each, nextUniqueId } from '../../utils/generic'
import { isMobile } from '../../utils/browser'
 
 
export default function reveal (target, options, interval, sync) {
	var this$1 = this;
 
 
	/**
	 * The reveal method has an optional 2nd parameter,
	 * so here we just shuffle things around to accept
	 * the interval being passed as the 2nd argument.
	 */
	if (typeof options === 'number') {
		interval = Math.abs(parseInt(options))
		options = {}
	} else {
		interval = Math.abs(parseInt(interval))
		options = options || {}
	}
 
	var config = deepAssign({}, this.defaults, options)
	var containers = this.store.containers
 
	var container
	var targets
	try {
		container = getNode(config.container)
		if (!container) {
			throw new Error('Invalid container.')
		}
		targets = getNodes(target, container)
		if (!targets) {
			throw new Error('Nothing to animate.')
		}
	} catch (e) {
		return logger.call(this, 'Reveal failed.', e.message)
	}
 
	/**
	 * Verify our platform matches our platform configuration.
	 */
	if (!config.mobile && isMobile() || !config.desktop && !isMobile()) {
		return logger.call(this, 'Reveal aborted.', 'This platform has been disabled.')
	}
 
	/**
	 * Sequence intervals must be at least 16ms (60fps).
	 */
	var sequence
	if (interval) {
		if (interval >= 16) {
			var sequenceId = nextUniqueId()
			sequence = {
				elementIds: [],
				nose: { blocked: false, index: null, pointer: null },
				tail: { blocked: false, index: null, pointer: null },
				id: sequenceId,
				interval: Math.abs(interval),
			}
		} else {
			return logger.call(this, 'Reveal failed.', 'Sequence interval must be at least 16ms.')
		}
	}
 
	var containerId
	each(containers, function (storedContainer) {
		if (!containerId && storedContainer.node === container) {
			containerId = storedContainer.id
		}
	})
 
	if (isNaN(containerId)) {
		containerId = nextUniqueId()
	}
 
	try {
		var elements = targets.map(function (node) {
			var element = {}
			var existingId = node.getAttribute('data-sr-id')
 
			if (existingId) {
				deepAssign(element, this$1.store.elements[existingId])
 
				/**
				 * In order to prevent previously generated styles
				 * from throwing off the new styles, the style tag
				 * has to be reverted to it's pre-reveal state.
				 */
				element.node.setAttribute('style', element.styles.inline)
 
			} else {
				element.id = nextUniqueId()
				element.node = node
				element.seen = false
				element.revealed = false
				element.visible = false
			}
 
			element.config = config
			element.containerId = containerId
			element.styles = style(element)
 
			if (sequence) {
				element.sequence = {
					id: sequence.id,
					index: sequence.elementIds.length,
				}
				sequence.elementIds.push(element.id)
			}
 
			return element
		})
 
		/**
		* Modifying the DOM via setAttribute needs to be handled
		* separately from reading computed styles in the map above
		* for the browser to batch DOM changes (limiting reflows)
		*/
		each(elements, function (element) {
			this$1.store.elements[element.id] = element
			element.node.setAttribute('data-sr-id', element.id)
		})
 
	} catch (e) {
		return logger.call(this, 'Reveal failed.', e.message)
	}
 
	containers[containerId] = containers[containerId] || {
		id: containerId,
		node: container,
	}
 
	if (sequence) {
		this.store.sequences[sequence.id] = sequence
	}
 
	/**
	* If reveal wasn't invoked by sync, we want to
	* make sure to add this call to the history.
	*/
	if (!sync) {
		this.store.history.push({ target: target, options: options, interval: interval })
 
		/**
		* Push initialization to the event queue, giving
		* multiple reveal calls time to be interpretted.
		*/
		if (this.initTimeout) {
			window.clearTimeout(this.initTimeout)
		}
		this.initTimeout = window.setTimeout(initialize.bind(this), 0)
	}
}