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'use strict';
var helpers = require('../helpers/index');
var basic = require('./platform.basic');
var dom = require('./platform.dom');
// @TODO Make possible to select another platform at build time.
var implementation = dom._enabled ? dom : basic;
/**
* @namespace Chart.platform
* @see https://chartjs.gitbooks.io/proposals/content/Platform.html
* @since 2.4.0
*/
module.exports = helpers.extend({
/**
* @since 2.7.0
*/
initialize: function() {},
/**
* Called at chart construction time, returns a context2d instance implementing
* the [W3C Canvas 2D Context API standard]{@link https://www.w3.org/TR/2dcontext/}.
* @param {*} item - The native item from which to acquire context (platform specific)
* @param {object} options - The chart options
* @returns {CanvasRenderingContext2D} context2d instance
*/
acquireContext: function() {},
/**
* Called at chart destruction time, releases any resources associated to the context
* previously returned by the acquireContext() method.
* @param {CanvasRenderingContext2D} context - The context2d instance
* @returns {boolean} true if the method succeeded, else false
*/
releaseContext: function() {},
/**
* Registers the specified listener on the given chart.
* @param {Chart} chart - Chart from which to listen for event
* @param {string} type - The ({@link IEvent}) type to listen for
* @param {function} listener - Receives a notification (an object that implements
* the {@link IEvent} interface) when an event of the specified type occurs.
*/
addEventListener: function() {},
/**
* Removes the specified listener previously registered with addEventListener.
* @param {Chart} chart - Chart from which to remove the listener
* @param {string} type - The ({@link IEvent}) type to remove
* @param {function} listener - The listener function to remove from the event target.
*/
removeEventListener: function() {}
}, implementation);
/**
* @interface IPlatform
* Allows abstracting platform dependencies away from the chart
* @borrows Chart.platform.acquireContext as acquireContext
* @borrows Chart.platform.releaseContext as releaseContext
* @borrows Chart.platform.addEventListener as addEventListener
* @borrows Chart.platform.removeEventListener as removeEventListener
*/
/**
* @interface IEvent
* @prop {string} type - The event type name, possible values are:
* 'contextmenu', 'mouseenter', 'mousedown', 'mousemove', 'mouseup', 'mouseout',
* 'click', 'dblclick', 'keydown', 'keypress', 'keyup' and 'resize'
* @prop {*} native - The original native event (null for emulated events, e.g. 'resize')
* @prop {number} x - The mouse x position, relative to the canvas (null for incompatible events)
* @prop {number} y - The mouse y position, relative to the canvas (null for incompatible events)
*/