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elements.js
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elements.js
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import {Animations} from 'chart.js';
import {isObject, isArray, defined} from 'chart.js/helpers';
import {eventHooks} from './events';
import {elementHooks} from './hooks';
import {annotationTypes} from './types';
const directUpdater = {
update: Object.assign
};
const hooks = eventHooks.concat(elementHooks);
const resolve = (value, optDefs) => isObject(optDefs) ? resolveObj(value, optDefs) : value;
/**
* @typedef { import("chart.js").Chart } Chart
* @typedef { import("chart.js").UpdateMode } UpdateMode
* @typedef { import('../../types/options').AnnotationPluginOptions } AnnotationPluginOptions
*/
/**
* @param {string} prop
* @returns {boolean}
*/
export const isIndexable = (prop) => prop === 'color' || prop === 'font';
/**
* Resolve the annotation type, checking if is supported.
* @param {string} [type=line] - annotation type
* @returns {string} resolved annotation type
*/
export function resolveType(type = 'line') {
if (annotationTypes[type]) {
return type;
}
console.warn(`Unknown annotation type: '${type}', defaulting to 'line'`);
return 'line';
}
/**
* @param {Chart} chart
* @param {Object} state
* @param {AnnotationPluginOptions} options
* @param {UpdateMode} mode
*/
export function updateElements(chart, state, options, mode) {
const animations = resolveAnimations(chart, options.animations, mode);
const annotations = state.annotations;
const elements = resyncElements(state.elements, annotations);
for (let i = 0; i < annotations.length; i++) {
const annotationOptions = annotations[i];
const element = getOrCreateElement(elements, i, annotationOptions.type);
const resolver = annotationOptions.setContext(getContext(chart, element, elements, annotationOptions));
const properties = element.resolveElementProperties(chart, resolver);
properties.skip = toSkip(properties);
if ('elements' in properties) {
updateSubElements(element, properties.elements, resolver, animations);
// Remove the sub-element definitions from properties, so the actual elements
// are not overwritten by their definitions
delete properties.elements;
}
if (!defined(element.x)) {
// If the element is newly created, assing the properties directly - to
// make them readily awailable to any scriptable options. If we do not do this,
// the properties retruned by `resolveElementProperties` are available only
// after options resolution.
Object.assign(element, properties);
}
Object.assign(element, properties.initProperties);
properties.options = resolveAnnotationOptions(resolver);
animations.update(element, properties);
}
}
function toSkip(properties) {
return isNaN(properties.x) || isNaN(properties.y);
}
function resolveAnimations(chart, animOpts, mode) {
if (mode === 'reset' || mode === 'none' || mode === 'resize') {
return directUpdater;
}
return new Animations(chart, animOpts);
}
function updateSubElements(mainElement, elements, resolver, animations) {
const subElements = mainElement.elements || (mainElement.elements = []);
subElements.length = elements.length;
for (let i = 0; i < elements.length; i++) {
const definition = elements[i];
const properties = definition.properties;
const subElement = getOrCreateElement(subElements, i, definition.type, definition.initProperties);
const subResolver = resolver[definition.optionScope].override(definition);
properties.options = resolveAnnotationOptions(subResolver);
animations.update(subElement, properties);
}
}
function getOrCreateElement(elements, index, type, initProperties) {
const elementClass = annotationTypes[resolveType(type)];
let element = elements[index];
if (!element || !(element instanceof elementClass)) {
element = elements[index] = new elementClass();
Object.assign(element, initProperties);
}
return element;
}
function resolveAnnotationOptions(resolver) {
const elementClass = annotationTypes[resolveType(resolver.type)];
const result = {};
result.id = resolver.id;
result.type = resolver.type;
result.drawTime = resolver.drawTime;
Object.assign(result,
resolveObj(resolver, elementClass.defaults),
resolveObj(resolver, elementClass.defaultRoutes));
for (const hook of hooks) {
result[hook] = resolver[hook];
}
return result;
}
function resolveObj(resolver, defs) {
const result = {};
for (const prop of Object.keys(defs)) {
const optDefs = defs[prop];
const value = resolver[prop];
if (isIndexable(prop) && isArray(value)) {
result[prop] = value.map((item) => resolve(item, optDefs));
} else {
result[prop] = resolve(value, optDefs);
}
}
return result;
}
function getContext(chart, element, elements, annotation) {
return element.$context || (element.$context = Object.assign(Object.create(chart.getContext()), {
element,
get elements() {
return elements.filter((el) => el && el.options);
},
id: annotation.id,
type: 'annotation'
}));
}
function resyncElements(elements, annotations) {
const count = annotations.length;
const start = elements.length;
if (start < count) {
const add = count - start;
elements.splice(start, 0, ...new Array(add));
} else if (start > count) {
elements.splice(count, start - count);
}
return elements;
}