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'use strict';
var defaults = require('./core.defaults');
var helpers = require('../helpers/index');
defaults._set('global', {
plugins: {}
});
/**
* The plugin service singleton
* @namespace Chart.plugins
* @since 2.1.0
*/
module.exports = {
/**
* Globally registered plugins.
* @private
*/
_plugins: [],
/**
* This identifier is used to invalidate the descriptors cache attached to each chart
* when a global plugin is registered or unregistered. In this case, the cache ID is
* incremented and descriptors are regenerated during following API calls.
* @private
*/
_cacheId: 0,
/**
* Registers the given plugin(s) if not already registered.
* @param {IPlugin[]|IPlugin} plugins plugin instance(s).
*/
register: function(plugins) {
var p = this._plugins;
([]).concat(plugins).forEach(function(plugin) {
if (p.indexOf(plugin) === -1) {
p.push(plugin);
}
});
this._cacheId++;
},
/**
* Unregisters the given plugin(s) only if registered.
* @param {IPlugin[]|IPlugin} plugins plugin instance(s).
*/
unregister: function(plugins) {
var p = this._plugins;
([]).concat(plugins).forEach(function(plugin) {
var idx = p.indexOf(plugin);
if (idx !== -1) {
p.splice(idx, 1);
}
});
this._cacheId++;
},
/**
* Remove all registered plugins.
* @since 2.1.5
*/
clear: function() {
this._plugins = [];
this._cacheId++;
},
/**
* Returns the number of registered plugins?
* @returns {number}
* @since 2.1.5
*/
count: function() {
return this._plugins.length;
},
/**
* Returns all registered plugin instances.
* @returns {IPlugin[]} array of plugin objects.
* @since 2.1.5
*/
getAll: function() {
return this._plugins;
},
/**
* Calls enabled plugins for `chart` on the specified hook and with the given args.
* This method immediately returns as soon as a plugin explicitly returns false. The
* returned value can be used, for instance, to interrupt the current action.
* @param {Chart} chart - The chart instance for which plugins should be called.
* @param {string} hook - The name of the plugin method to call (e.g. 'beforeUpdate').
* @param {Array} [args] - Extra arguments to apply to the hook call.
* @returns {boolean} false if any of the plugins return false, else returns true.
*/
notify: function(chart, hook, args) {
var descriptors = this.descriptors(chart);
var ilen = descriptors.length;
var i, descriptor, plugin, params, method;
for (i = 0; i < ilen; ++i) {
descriptor = descriptors[i];
plugin = descriptor.plugin;
method = plugin[hook];
if (typeof method === 'function') {
params = [chart].concat(args || []);
params.push(descriptor.options);
if (method.apply(plugin, params) === false) {
return false;
}
}
}
return true;
},
/**
* Returns descriptors of enabled plugins for the given chart.
* @returns {object[]} [{ plugin, options }]
* @private
*/
descriptors: function(chart) {
var cache = chart.$plugins || (chart.$plugins = {});
if (cache.id === this._cacheId) {
return cache.descriptors;
}
var plugins = [];
var descriptors = [];
var config = (chart && chart.config) || {};
var options = (config.options && config.options.plugins) || {};
this._plugins.concat(config.plugins || []).forEach(function(plugin) {
var idx = plugins.indexOf(plugin);
if (idx !== -1) {
return;
}
var id = plugin.id;
var opts = options[id];
if (opts === false) {
return;
}
if (opts === true) {
opts = helpers.clone(defaults.global.plugins[id]);
}
plugins.push(plugin);
descriptors.push({
plugin: plugin,
options: opts || {}
});
});
cache.descriptors = descriptors;
cache.id = this._cacheId;
return descriptors;
},
/**
* Invalidates cache for the given chart: descriptors hold a reference on plugin option,
* but in some cases, this reference can be changed by the user when updating options.
* https://github.com/chartjs/Chart.js/issues/5111#issuecomment-355934167
* @private
*/
_invalidate: function(chart) {
delete chart.$plugins;
}
};
/**
* Plugin extension hooks.
* @interface IPlugin
* @since 2.1.0
*/
/**
* @method IPlugin#beforeInit
* @desc Called before initializing `chart`.
* @param {Chart.Controller} chart - The chart instance.
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#afterInit
* @desc Called after `chart` has been initialized and before the first update.
* @param {Chart.Controller} chart - The chart instance.
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#beforeUpdate
* @desc Called before updating `chart`. If any plugin returns `false`, the update
* is cancelled (and thus subsequent render(s)) until another `update` is triggered.
* @param {Chart.Controller} chart - The chart instance.
* @param {object} options - The plugin options.
* @returns {boolean} `false` to cancel the chart update.
*/
/**
* @method IPlugin#afterUpdate
* @desc Called after `chart` has been updated and before rendering. Note that this
* hook will not be called if the chart update has been previously cancelled.
* @param {Chart.Controller} chart - The chart instance.
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#beforeDatasetsUpdate
* @desc Called before updating the `chart` datasets. If any plugin returns `false`,
* the datasets update is cancelled until another `update` is triggered.
* @param {Chart.Controller} chart - The chart instance.
* @param {object} options - The plugin options.
* @returns {boolean} false to cancel the datasets update.
* @since version 2.1.5
*/
/**
* @method IPlugin#afterDatasetsUpdate
* @desc Called after the `chart` datasets have been updated. Note that this hook
* will not be called if the datasets update has been previously cancelled.
* @param {Chart.Controller} chart - The chart instance.
* @param {object} options - The plugin options.
* @since version 2.1.5
*/
/**
* @method IPlugin#beforeDatasetUpdate
* @desc Called before updating the `chart` dataset at the given `args.index`. If any plugin
* returns `false`, the datasets update is cancelled until another `update` is triggered.
* @param {Chart} chart - The chart instance.
* @param {object} args - The call arguments.
* @param {number} args.index - The dataset index.
* @param {object} args.meta - The dataset metadata.
* @param {object} options - The plugin options.
* @returns {boolean} `false` to cancel the chart datasets drawing.
*/
/**
* @method IPlugin#afterDatasetUpdate
* @desc Called after the `chart` datasets at the given `args.index` has been updated. Note
* that this hook will not be called if the datasets update has been previously cancelled.
* @param {Chart} chart - The chart instance.
* @param {object} args - The call arguments.
* @param {number} args.index - The dataset index.
* @param {object} args.meta - The dataset metadata.
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#beforeLayout
* @desc Called before laying out `chart`. If any plugin returns `false`,
* the layout update is cancelled until another `update` is triggered.
* @param {Chart.Controller} chart - The chart instance.
* @param {object} options - The plugin options.
* @returns {boolean} `false` to cancel the chart layout.
*/
/**
* @method IPlugin#afterLayout
* @desc Called after the `chart` has been layed out. Note that this hook will not
* be called if the layout update has been previously cancelled.
* @param {Chart.Controller} chart - The chart instance.
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#beforeRender
* @desc Called before rendering `chart`. If any plugin returns `false`,
* the rendering is cancelled until another `render` is triggered.
* @param {Chart.Controller} chart - The chart instance.
* @param {object} options - The plugin options.
* @returns {boolean} `false` to cancel the chart rendering.
*/
/**
* @method IPlugin#afterRender
* @desc Called after the `chart` has been fully rendered (and animation completed). Note
* that this hook will not be called if the rendering has been previously cancelled.
* @param {Chart.Controller} chart - The chart instance.
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#beforeDraw
* @desc Called before drawing `chart` at every animation frame specified by the given
* easing value. If any plugin returns `false`, the frame drawing is cancelled until
* another `render` is triggered.
* @param {Chart.Controller} chart - The chart instance.
* @param {number} easingValue - The current animation value, between 0.0 and 1.0.
* @param {object} options - The plugin options.
* @returns {boolean} `false` to cancel the chart drawing.
*/
/**
* @method IPlugin#afterDraw
* @desc Called after the `chart` has been drawn for the specific easing value. Note
* that this hook will not be called if the drawing has been previously cancelled.
* @param {Chart.Controller} chart - The chart instance.
* @param {number} easingValue - The current animation value, between 0.0 and 1.0.
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#beforeDatasetsDraw
* @desc Called before drawing the `chart` datasets. If any plugin returns `false`,
* the datasets drawing is cancelled until another `render` is triggered.
* @param {Chart.Controller} chart - The chart instance.
* @param {number} easingValue - The current animation value, between 0.0 and 1.0.
* @param {object} options - The plugin options.
* @returns {boolean} `false` to cancel the chart datasets drawing.
*/
/**
* @method IPlugin#afterDatasetsDraw
* @desc Called after the `chart` datasets have been drawn. Note that this hook
* will not be called if the datasets drawing has been previously cancelled.
* @param {Chart.Controller} chart - The chart instance.
* @param {number} easingValue - The current animation value, between 0.0 and 1.0.
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#beforeDatasetDraw
* @desc Called before drawing the `chart` dataset at the given `args.index` (datasets
* are drawn in the reverse order). If any plugin returns `false`, the datasets drawing
* is cancelled until another `render` is triggered.
* @param {Chart} chart - The chart instance.
* @param {object} args - The call arguments.
* @param {number} args.index - The dataset index.
* @param {object} args.meta - The dataset metadata.
* @param {number} args.easingValue - The current animation value, between 0.0 and 1.0.
* @param {object} options - The plugin options.
* @returns {boolean} `false` to cancel the chart datasets drawing.
*/
/**
* @method IPlugin#afterDatasetDraw
* @desc Called after the `chart` datasets at the given `args.index` have been drawn
* (datasets are drawn in the reverse order). Note that this hook will not be called
* if the datasets drawing has been previously cancelled.
* @param {Chart} chart - The chart instance.
* @param {object} args - The call arguments.
* @param {number} args.index - The dataset index.
* @param {object} args.meta - The dataset metadata.
* @param {number} args.easingValue - The current animation value, between 0.0 and 1.0.
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#beforeTooltipDraw
* @desc Called before drawing the `tooltip`. If any plugin returns `false`,
* the tooltip drawing is cancelled until another `render` is triggered.
* @param {Chart} chart - The chart instance.
* @param {object} args - The call arguments.
* @param {Tooltip} args.tooltip - The tooltip.
* @param {number} args.easingValue - The current animation value, between 0.0 and 1.0.
* @param {object} options - The plugin options.
* @returns {boolean} `false` to cancel the chart tooltip drawing.
*/
/**
* @method IPlugin#afterTooltipDraw
* @desc Called after drawing the `tooltip`. Note that this hook will not
* be called if the tooltip drawing has been previously cancelled.
* @param {Chart} chart - The chart instance.
* @param {object} args - The call arguments.
* @param {Tooltip} args.tooltip - The tooltip.
* @param {number} args.easingValue - The current animation value, between 0.0 and 1.0.
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#beforeEvent
* @desc Called before processing the specified `event`. If any plugin returns `false`,
* the event will be discarded.
* @param {Chart.Controller} chart - The chart instance.
* @param {IEvent} event - The event object.
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#afterEvent
* @desc Called after the `event` has been consumed. Note that this hook
* will not be called if the `event` has been previously discarded.
* @param {Chart.Controller} chart - The chart instance.
* @param {IEvent} event - The event object.
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#resize
* @desc Called after the chart as been resized.
* @param {Chart.Controller} chart - The chart instance.
* @param {number} size - The new canvas display size (eq. canvas.style width & height).
* @param {object} options - The plugin options.
*/
/**
* @method IPlugin#destroy
* @desc Called after the chart as been destroyed.
* @param {Chart.Controller} chart - The chart instance.
* @param {object} options - The plugin options.
*/