@angular/animations
Version:
Angular - animations integration with web-animations
107 lines • 14.3 kB
JavaScript
/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import { eraseStyles, setStyles } from '../util';
/**
* Returns an instance of `SpecialCasedStyles` if and when any special (non animateable) styles are
* detected.
*
* In CSS there exist properties that cannot be animated within a keyframe animation
* (whether it be via CSS keyframes or web-animations) and the animation implementation
* will ignore them. This function is designed to detect those special cased styles and
* return a container that will be executed at the start and end of the animation.
*
* @returns an instance of `SpecialCasedStyles` if any special styles are detected otherwise `null`
*/
export function packageNonAnimatableStyles(element, styles) {
let startStyles = null;
let endStyles = null;
if (Array.isArray(styles) && styles.length) {
startStyles = filterNonAnimatableStyles(styles[0]);
if (styles.length > 1) {
endStyles = filterNonAnimatableStyles(styles[styles.length - 1]);
}
}
else if (styles) {
startStyles = filterNonAnimatableStyles(styles);
}
return (startStyles || endStyles) ? new SpecialCasedStyles(element, startStyles, endStyles) :
null;
}
/**
* Designed to be executed during a keyframe-based animation to apply any special-cased styles.
*
* When started (when the `start()` method is run) then the provided `startStyles`
* will be applied. When finished (when the `finish()` method is called) the
* `endStyles` will be applied as well any any starting styles. Finally when
* `destroy()` is called then all styles will be removed.
*/
export class SpecialCasedStyles {
constructor(_element, _startStyles, _endStyles) {
this._element = _element;
this._startStyles = _startStyles;
this._endStyles = _endStyles;
this._state = 0 /* Pending */;
let initialStyles = SpecialCasedStyles.initialStylesByElement.get(_element);
if (!initialStyles) {
SpecialCasedStyles.initialStylesByElement.set(_element, initialStyles = {});
}
this._initialStyles = initialStyles;
}
start() {
if (this._state < 1 /* Started */) {
if (this._startStyles) {
setStyles(this._element, this._startStyles, this._initialStyles);
}
this._state = 1 /* Started */;
}
}
finish() {
this.start();
if (this._state < 2 /* Finished */) {
setStyles(this._element, this._initialStyles);
if (this._endStyles) {
setStyles(this._element, this._endStyles);
this._endStyles = null;
}
this._state = 1 /* Started */;
}
}
destroy() {
this.finish();
if (this._state < 3 /* Destroyed */) {
SpecialCasedStyles.initialStylesByElement.delete(this._element);
if (this._startStyles) {
eraseStyles(this._element, this._startStyles);
this._endStyles = null;
}
if (this._endStyles) {
eraseStyles(this._element, this._endStyles);
this._endStyles = null;
}
setStyles(this._element, this._initialStyles);
this._state = 3 /* Destroyed */;
}
}
}
SpecialCasedStyles.initialStylesByElement = new WeakMap();
function filterNonAnimatableStyles(styles) {
let result = null;
const props = Object.keys(styles);
for (let i = 0; i < props.length; i++) {
const prop = props[i];
if (isNonAnimatableStyle(prop)) {
result = result || {};
result[prop] = styles[prop];
}
}
return result;
}
function isNonAnimatableStyle(prop) {
return prop === 'display' || prop === 'position';
}
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This function is designed to detect those special cased styles and\n * return a container that will be executed at the start and end of the animation.\n *\n * @returns an instance of `SpecialCasedStyles` if any special styles are detected otherwise `null`\n */\nexport function packageNonAnimatableStyles(\n    element: any, styles: {[key: string]: any}|{[key: string]: any}[]): SpecialCasedStyles|null {\n  let startStyles: {[key: string]: any}|null = null;\n  let endStyles: {[key: string]: any}|null = null;\n  if (Array.isArray(styles) && styles.length) {\n    startStyles = filterNonAnimatableStyles(styles[0]);\n    if (styles.length > 1) {\n      endStyles = filterNonAnimatableStyles(styles[styles.length - 1]);\n    }\n  } else if (styles) {\n    startStyles = filterNonAnimatableStyles(styles);\n  }\n\n  return (startStyles || endStyles) ? new SpecialCasedStyles(element, startStyles, endStyles) :\n                                      null;\n}\n\n/**\n * Designed to be executed during a keyframe-based animation to apply any special-cased styles.\n *\n * When started (when the `start()` method is run) then the provided `startStyles`\n * will be applied. When finished (when the `finish()` method is called) the\n * `endStyles` will be applied as well any any starting styles. Finally when\n * `destroy()` is called then all styles will be removed.\n */\nexport class SpecialCasedStyles {\n  static initialStylesByElement = new WeakMap<any, {[key: string]: any}>();\n\n  private _state = SpecialCasedStylesState.Pending;\n  private _initialStyles!: {[key: string]: any};\n\n  constructor(\n      private _element: any, private _startStyles: {[key: string]: any}|null,\n      private _endStyles: {[key: string]: any}|null) {\n    let initialStyles = SpecialCasedStyles.initialStylesByElement.get(_element);\n    if (!initialStyles) {\n      SpecialCasedStyles.initialStylesByElement.set(_element, initialStyles = {});\n    }\n    this._initialStyles = initialStyles;\n  }\n\n  start() {\n    if (this._state < SpecialCasedStylesState.Started) {\n      if (this._startStyles) {\n        setStyles(this._element, this._startStyles, this._initialStyles);\n      }\n      this._state = SpecialCasedStylesState.Started;\n    }\n  }\n\n  finish() {\n    this.start();\n    if (this._state < SpecialCasedStylesState.Finished) {\n      setStyles(this._element, this._initialStyles);\n      if (this._endStyles) {\n        setStyles(this._element, this._endStyles);\n        this._endStyles = null;\n      }\n      this._state = SpecialCasedStylesState.Started;\n    }\n  }\n\n  destroy() {\n    this.finish();\n    if (this._state < SpecialCasedStylesState.Destroyed) {\n      SpecialCasedStyles.initialStylesByElement.delete(this._element);\n      if (this._startStyles) {\n        eraseStyles(this._element, this._startStyles);\n        this._endStyles = null;\n      }\n      if (this._endStyles) {\n        eraseStyles(this._element, this._endStyles);\n        this._endStyles = null;\n      }\n      setStyles(this._element, this._initialStyles);\n      this._state = SpecialCasedStylesState.Destroyed;\n    }\n  }\n}\n\n/**\n * An enum of states reflective of what the status of `SpecialCasedStyles` is.\n *\n * Depending on how `SpecialCasedStyles` is interacted with, the start and end\n * styles may not be applied in the same way. This enum ensures that if and when\n * the ending styles are applied then the starting styles are applied. It is\n * also used to reflect what the current status of the special cased styles are\n * which helps prevent the starting/ending styles not be applied twice. It is\n * also used to cleanup the styles once `SpecialCasedStyles` is destroyed.\n */\nconst enum SpecialCasedStylesState {\n  Pending = 0,\n  Started = 1,\n  Finished = 2,\n  Destroyed = 3,\n}\n\nfunction filterNonAnimatableStyles(styles: {[key: string]: any}) {\n  let result: {[key: string]: any}|null = null;\n  const props = Object.keys(styles);\n  for (let i = 0; i < props.length; i++) {\n    const prop = props[i];\n    if (isNonAnimatableStyle(prop)) {\n      result = result || {};\n      result[prop] = styles[prop];\n    }\n  }\n  return result;\n}\n\nfunction isNonAnimatableStyle(prop: string) {\n  return prop === 'display' || prop === 'position';\n}\n"]}