@angular/common
Version:
Angular - commonly needed directives and services
261 lines • 33.4 kB
JavaScript
/**
* @license
* Copyright Google Inc. 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
*/
/**
* Used to diff and convert ngStyle/ngClass instructions into [style] and [class] bindings.
*
* ngStyle and ngClass both accept various forms of input and behave differently than that
* of how [style] and [class] behave in Angular.
*
* The differences are:
* - ngStyle and ngClass both **watch** their binding values for changes each time CD runs
* while [style] and [class] bindings do not (they check for identity changes)
* - ngStyle allows for unit-based keys (e.g. `{'max-width.px':value}`) and [style] does not
* - ngClass supports arrays of class values and [class] only accepts map and string values
* - ngClass allows for multiple className keys (space-separated) within an array or map
* (as the * key) while [class] only accepts a simple key/value map object
*
* Having Angular understand and adapt to all the different forms of behavior is complicated
* and unnecessary. Instead, ngClass and ngStyle should have their input values be converted
* into something that the core-level [style] and [class] bindings understand.
*
* This [StylingDiffer] class handles this conversion by creating a new input value each time
* the inner representation of the binding value have changed.
*
* ## Why do we care about ngStyle/ngClass?
* The styling algorithm code (documented inside of `render3/interfaces/styling.ts`) needs to
* respect and understand the styling values emitted through ngStyle and ngClass (when they
* are present and used in a template).
*
* Instead of having these directives manage styling on their own, they should be included
* into the Angular styling algorithm that exists for [style] and [class] bindings.
*
* Here's why:
*
* - If ngStyle/ngClass is used in combination with [style]/[class] bindings then the
* styles and classes would fall out of sync and be applied and updated at
* inconsistent times
* - Both ngClass/ngStyle do not respect [class.name] and [style.prop] bindings
* (they will write over them given the right combination of events)
*
* ```
* <!-- if `w1` is updated then it will always override `w2`
* if `w2` is updated then it will always override `w1`
* if both are updated at the same time then `w1` wins -->
* <div [ngStyle]="{width:w1}" [style.width]="w2">...</div>
*
* <!-- if `w1` is updated then it will always lose to `w2`
* if `w2` is updated then it will always override `w1`
* if both are updated at the same time then `w2` wins -->
* <div [style]="{width:w1}" [style.width]="w2">...</div>
* ```
* - ngClass/ngStyle were written as a directives and made use of maps, closures and other
* expensive data structures which were evaluated each time CD runs
*/
var StylingDiffer = /** @class */ (function () {
function StylingDiffer(_name, _options) {
this._name = _name;
this._options = _options;
this.value = null;
this._lastSetValue = null;
this._lastSetValueType = 0 /* Null */;
this._lastSetValueIdentityChange = false;
}
/**
* Sets (updates) the styling value within the differ.
*
* Only when `hasValueChanged` is called then this new value will be evaluted
* and checked against the previous value.
*
* @param value the new styling value provided from the ngClass/ngStyle binding
*/
StylingDiffer.prototype.setValue = function (value) {
if (Array.isArray(value)) {
this._lastSetValueType = 4 /* Array */;
}
else if (value instanceof Set) {
this._lastSetValueType = 8 /* Set */;
}
else if (value && typeof value === 'string') {
if (!(this._options & 4 /* AllowStringValue */)) {
throw new Error(this._name + ' string values are not allowed');
}
this._lastSetValueType = 1 /* String */;
}
else {
this._lastSetValueType = value ? 2 /* Map */ : 0 /* Null */;
}
this._lastSetValueIdentityChange = true;
this._lastSetValue = value || null;
};
/**
* Determines whether or not the value has changed.
*
* This function can be called right after `setValue()` is called, but it can also be
* called incase the existing value (if it's a collection) changes internally. If the
* value is indeed a collection it will do the necessary diffing work and produce a
* new object value as assign that to `value`.
*
* @returns whether or not the value has changed in some way.
*/
StylingDiffer.prototype.hasValueChanged = function () {
var valueHasChanged = this._lastSetValueIdentityChange;
if (!valueHasChanged && !(this._lastSetValueType & 14 /* Collection */))
return false;
var finalValue = null;
var trimValues = (this._options & 1 /* TrimProperties */) ? true : false;
var parseOutUnits = (this._options & 8 /* AllowUnits */) ? true : false;
var allowSubKeys = (this._options & 2 /* AllowSubKeys */) ? true : false;
switch (this._lastSetValueType) {
// case 1: [input]="string"
case 1 /* String */:
var tokens = this._lastSetValue.split(/\s+/g);
if (this._options & 16 /* ForceAsMap */) {
finalValue = {};
tokens.forEach(function (token, i) { return finalValue[token] = true; });
}
else {
finalValue = tokens.reduce(function (str, token, i) { return str + (i ? ' ' : '') + token; });
}
break;
// case 2: [input]="{key:value}"
case 2 /* Map */:
var map = this._lastSetValue;
var keys = Object.keys(map);
if (!valueHasChanged) {
if (this.value) {
// we know that the classExp value exists and that it is
// a map (otherwise an identity change would have occurred)
valueHasChanged = mapHasChanged(keys, this.value, map);
}
else {
valueHasChanged = true;
}
}
if (valueHasChanged) {
finalValue =
bulidMapFromValues(this._name, trimValues, parseOutUnits, allowSubKeys, map, keys);
}
break;
// case 3a: [input]="[str1, str2, ...]"
// case 3b: [input]="Set"
case 4 /* Array */:
case 8 /* Set */:
var values = Array.from(this._lastSetValue);
if (!valueHasChanged) {
var keys_1 = Object.keys(this.value);
valueHasChanged = !arrayEqualsArray(keys_1, values);
}
if (valueHasChanged) {
finalValue =
bulidMapFromValues(this._name, trimValues, parseOutUnits, allowSubKeys, values);
}
break;
// case 4: [input]="null|undefined"
default:
finalValue = null;
break;
}
if (valueHasChanged) {
this.value = finalValue;
}
return valueHasChanged;
};
return StylingDiffer;
}());
export { StylingDiffer };
/**
* builds and returns a map based on the values input value
*
* If the `keys` param is provided then the `values` param is treated as a
* string map. Otherwise `values` is treated as a string array.
*/
function bulidMapFromValues(errorPrefix, trim, parseOutUnits, allowSubKeys, values, keys) {
var map = {};
if (keys) {
// case 1: map
for (var i = 0; i < keys.length; i++) {
var key = keys[i];
key = trim ? key.trim() : key;
var value = values[key];
setMapValues(map, key, value, parseOutUnits, allowSubKeys);
}
}
else {
// case 2: array
for (var i = 0; i < values.length; i++) {
var value = values[i];
assertValidValue(errorPrefix, value);
value = trim ? value.trim() : value;
setMapValues(map, value, true, false, allowSubKeys);
}
}
return map;
}
function assertValidValue(errorPrefix, value) {
if (typeof value !== 'string') {
throw new Error(errorPrefix + " can only toggle CSS classes expressed as strings, got " + value);
}
}
function setMapValues(map, key, value, parseOutUnits, allowSubKeys) {
if (allowSubKeys && key.indexOf(' ') > 0) {
var innerKeys = key.split(/\s+/g);
for (var j = 0; j < innerKeys.length; j++) {
setIndividualMapValue(map, innerKeys[j], value, parseOutUnits);
}
}
else {
setIndividualMapValue(map, key, value, parseOutUnits);
}
}
function setIndividualMapValue(map, key, value, parseOutUnits) {
if (parseOutUnits) {
var values = normalizeStyleKeyAndValue(key, value);
value = values.value;
key = values.key;
}
map[key] = value;
}
function normalizeStyleKeyAndValue(key, value) {
var index = key.indexOf('.');
if (index > 0) {
var unit = key.substr(index + 1); // ignore the . ([width.px]="'40'" => "40px")
key = key.substring(0, index);
if (value != null) { // we should not convert null values to string
value += unit;
}
}
return { key: key, value: value };
}
function mapHasChanged(keys, a, b) {
var oldKeys = Object.keys(a);
var newKeys = keys;
// the keys are different which means the map changed
if (!arrayEqualsArray(oldKeys, newKeys)) {
return true;
}
for (var i = 0; i < newKeys.length; i++) {
var key = newKeys[i];
if (a[key] !== b[key]) {
return true;
}
}
return false;
}
function arrayEqualsArray(a, b) {
if (a && b) {
if (a.length !== b.length)
return false;
for (var i = 0; i < a.length; i++) {
if (b.indexOf(a[i]) === -1)
return false;
}
return true;
}
return false;
}
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* @license\n * Copyright Google Inc. All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\n/**\n * Used to diff and convert ngStyle/ngClass instructions into [style] and [class] bindings.\n *\n * ngStyle and ngClass both accept various forms of input and behave differently than that\n * of how [style] and [class] behave in Angular.\n *\n * The differences are:\n *  - ngStyle and ngClass both **watch** their binding values for changes each time CD runs\n *    while [style] and [class] bindings do not (they check for identity changes)\n *  - ngStyle allows for unit-based keys (e.g. `{'max-width.px':value}`) and [style] does not\n *  - ngClass supports arrays of class values and [class] only accepts map and string values\n *  - ngClass allows for multiple className keys (space-separated) within an array or map\n *     (as the * key) while [class] only accepts a simple key/value map object\n *\n * Having Angular understand and adapt to all the different forms of behavior is complicated\n * and unnecessary. Instead, ngClass and ngStyle should have their input values be converted\n * into something that the core-level [style] and [class] bindings understand.\n *\n * This [StylingDiffer] class handles this conversion by creating a new input value each time\n * the inner representation of the binding value have changed.\n *\n * ## Why do we care about ngStyle/ngClass?\n * The styling algorithm code (documented inside of `render3/interfaces/styling.ts`) needs to\n * respect and understand the styling values emitted through ngStyle and ngClass (when they\n * are present and used in a template).\n *\n * Instead of having these directives manage styling on their own, they should be included\n * into the Angular styling algorithm that exists for [style] and [class] bindings.\n *\n * Here's why:\n *\n * - If ngStyle/ngClass is used in combination with [style]/[class] bindings then the\n *   styles and classes would fall out of sync and be applied and updated at\n *   inconsistent times\n * - Both ngClass/ngStyle do not respect [class.name] and [style.prop] bindings\n *   (they will write over them given the right combination of events)\n *\n *   ```\n *   <!-- if `w1` is updated then it will always override `w2`\n *        if `w2` is updated then it will always override `w1`\n *        if both are updated at the same time then `w1` wins -->\n *   <div [ngStyle]=\"{width:w1}\" [style.width]=\"w2\">...</div>\n *\n *   <!-- if `w1` is updated then it will always lose to `w2`\n *        if `w2` is updated then it will always override `w1`\n *        if both are updated at the same time then `w2` wins -->\n *   <div [style]=\"{width:w1}\" [style.width]=\"w2\">...</div>\n *   ```\n * - ngClass/ngStyle were written as a directives and made use of maps, closures and other\n *   expensive data structures which were evaluated each time CD runs\n */\nexport class StylingDiffer<T> {\n  public readonly value: T|null = null;\n\n  private _lastSetValue: {[key: string]: any}|string|string[]|null = null;\n  private _lastSetValueType: StylingDifferValueTypes = StylingDifferValueTypes.Null;\n  private _lastSetValueIdentityChange = false;\n\n  constructor(private _name: string, private _options: StylingDifferOptions) {}\n\n  /**\n   * Sets (updates) the styling value within the differ.\n   *\n   * Only when `hasValueChanged` is called then this new value will be evaluted\n   * and checked against the previous value.\n   *\n   * @param value the new styling value provided from the ngClass/ngStyle binding\n   */\n  setValue(value: {[key: string]: any}|string[]|string|null) {\n    if (Array.isArray(value)) {\n      this._lastSetValueType = StylingDifferValueTypes.Array;\n    } else if (value instanceof Set) {\n      this._lastSetValueType = StylingDifferValueTypes.Set;\n    } else if (value && typeof value === 'string') {\n      if (!(this._options & StylingDifferOptions.AllowStringValue)) {\n        throw new Error(this._name + ' string values are not allowed');\n      }\n      this._lastSetValueType = StylingDifferValueTypes.String;\n    } else {\n      this._lastSetValueType = value ? StylingDifferValueTypes.Map : StylingDifferValueTypes.Null;\n    }\n\n    this._lastSetValueIdentityChange = true;\n    this._lastSetValue = value || null;\n  }\n\n  /**\n   * Determines whether or not the value has changed.\n   *\n   * This function can be called right after `setValue()` is called, but it can also be\n   * called incase the existing value (if it's a collection) changes internally. If the\n   * value is indeed a collection it will do the necessary diffing work and produce a\n   * new object value as assign that to `value`.\n   *\n   * @returns whether or not the value has changed in some way.\n   */\n  hasValueChanged(): boolean {\n    let valueHasChanged = this._lastSetValueIdentityChange;\n    if (!valueHasChanged && !(this._lastSetValueType & StylingDifferValueTypes.Collection))\n      return false;\n\n    let finalValue: {[key: string]: any}|string|null = null;\n    const trimValues = (this._options & StylingDifferOptions.TrimProperties) ? true : false;\n    const parseOutUnits = (this._options & StylingDifferOptions.AllowUnits) ? true : false;\n    const allowSubKeys = (this._options & StylingDifferOptions.AllowSubKeys) ? true : false;\n\n    switch (this._lastSetValueType) {\n      // case 1: [input]=\"string\"\n      case StylingDifferValueTypes.String:\n        const tokens = (this._lastSetValue as string).split(/\\s+/g);\n        if (this._options & StylingDifferOptions.ForceAsMap) {\n          finalValue = {};\n          tokens.forEach((token, i) => (finalValue as{[key: string]: any})[token] = true);\n        } else {\n          finalValue = tokens.reduce((str, token, i) => str + (i ? ' ' : '') + token);\n        }\n        break;\n\n      // case 2: [input]=\"{key:value}\"\n      case StylingDifferValueTypes.Map:\n        const map: {[key: string]: any} = this._lastSetValue as{[key: string]: any};\n        const keys = Object.keys(map);\n        if (!valueHasChanged) {\n          if (this.value) {\n            // we know that the classExp value exists and that it is\n            // a map (otherwise an identity change would have occurred)\n            valueHasChanged = mapHasChanged(keys, this.value as{[key: string]: any}, map);\n          } else {\n            valueHasChanged = true;\n          }\n        }\n\n        if (valueHasChanged) {\n          finalValue =\n              bulidMapFromValues(this._name, trimValues, parseOutUnits, allowSubKeys, map, keys);\n        }\n        break;\n\n      // case 3a: [input]=\"[str1, str2, ...]\"\n      // case 3b: [input]=\"Set\"\n      case StylingDifferValueTypes.Array:\n      case StylingDifferValueTypes.Set:\n        const values = Array.from(this._lastSetValue as string[] | Set<string>);\n        if (!valueHasChanged) {\n          const keys = Object.keys(this.value !);\n          valueHasChanged = !arrayEqualsArray(keys, values);\n        }\n        if (valueHasChanged) {\n          finalValue =\n              bulidMapFromValues(this._name, trimValues, parseOutUnits, allowSubKeys, values);\n        }\n        break;\n\n      // case 4: [input]=\"null|undefined\"\n      default:\n        finalValue = null;\n        break;\n    }\n\n    if (valueHasChanged) {\n      (this as any).value = finalValue !;\n    }\n\n    return valueHasChanged;\n  }\n}\n\n/**\n * Various options that are consumed by the [StylingDiffer] class.\n */\nexport const enum StylingDifferOptions {\n  None = 0b00000,\n  TrimProperties = 0b00001,\n  AllowSubKeys = 0b00010,\n  AllowStringValue = 0b00100,\n  AllowUnits = 0b01000,\n  ForceAsMap = 0b10000,\n}\n\n/**\n * The different types of inputs that the [StylingDiffer] can deal with\n */\nconst enum StylingDifferValueTypes {\n  Null = 0b0000,\n  String = 0b0001,\n  Map = 0b0010,\n  Array = 0b0100,\n  Set = 0b1000,\n  Collection = 0b1110,\n}\n\n\n/**\n * builds and returns a map based on the values input value\n *\n * If the `keys` param is provided then the `values` param is treated as a\n * string map. Otherwise `values` is treated as a string array.\n */\nfunction bulidMapFromValues(\n    errorPrefix: string, trim: boolean, parseOutUnits: boolean, allowSubKeys: boolean,\n    values: {[key: string]: any} | string[], keys?: string[]) {\n  const map: {[key: string]: any} = {};\n  if (keys) {\n    // case 1: map\n    for (let i = 0; i < keys.length; i++) {\n      let key = keys[i];\n      key = trim ? key.trim() : key;\n      const value = (values as{[key: string]: any})[key];\n      setMapValues(map, key, value, parseOutUnits, allowSubKeys);\n    }\n  } else {\n    // case 2: array\n    for (let i = 0; i < values.length; i++) {\n      let value = (values as string[])[i];\n      assertValidValue(errorPrefix, value);\n      value = trim ? value.trim() : value;\n      setMapValues(map, value, true, false, allowSubKeys);\n    }\n  }\n\n  return map;\n}\n\nfunction assertValidValue(errorPrefix: string, value: any) {\n  if (typeof value !== 'string') {\n    throw new Error(\n        `${errorPrefix} can only toggle CSS classes expressed as strings, got ${value}`);\n  }\n}\n\nfunction setMapValues(\n    map: {[key: string]: any}, key: string, value: any, parseOutUnits: boolean,\n    allowSubKeys: boolean) {\n  if (allowSubKeys && key.indexOf(' ') > 0) {\n    const innerKeys = key.split(/\\s+/g);\n    for (let j = 0; j < innerKeys.length; j++) {\n      setIndividualMapValue(map, innerKeys[j], value, parseOutUnits);\n    }\n  } else {\n    setIndividualMapValue(map, key, value, parseOutUnits);\n  }\n}\n\nfunction setIndividualMapValue(\n    map: {[key: string]: any}, key: string, value: any, parseOutUnits: boolean) {\n  if (parseOutUnits) {\n    const values = normalizeStyleKeyAndValue(key, value);\n    value = values.value;\n    key = values.key;\n  }\n  map[key] = value;\n}\n\nfunction normalizeStyleKeyAndValue(key: string, value: string | null) {\n  const index = key.indexOf('.');\n  if (index > 0) {\n    const unit = key.substr(index + 1);  // ignore the . ([width.px]=\"'40'\" => \"40px\")\n    key = key.substring(0, index);\n    if (value != null) {  // we should not convert null values to string\n      value += unit;\n    }\n  }\n  return {key, value};\n}\n\nfunction mapHasChanged(keys: string[], a: {[key: string]: any}, b: {[key: string]: any}) {\n  const oldKeys = Object.keys(a);\n  const newKeys = keys;\n\n  // the keys are different which means the map changed\n  if (!arrayEqualsArray(oldKeys, newKeys)) {\n    return true;\n  }\n\n  for (let i = 0; i < newKeys.length; i++) {\n    const key = newKeys[i];\n    if (a[key] !== b[key]) {\n      return true;\n    }\n  }\n\n  return false;\n}\n\nfunction arrayEqualsArray(a: any[] | null, b: any[] | null) {\n  if (a && b) {\n    if (a.length !== b.length) return false;\n    for (let i = 0; i < a.length; i++) {\n      if (b.indexOf(a[i]) === -1) return false;\n    }\n    return true;\n  }\n  return false;\n}\n"]}