@angular/cdk/fesm2022/_selection-model-chunk.mjs.map

Angular Material Component Development Kit

{"version":3,"file":"_selection-model-chunk.mjs","sources":["../../../../../darwin_arm64-fastbuild-ST-fdfa778d11ba/bin/src/cdk/collections/selection-model.ts"],"sourcesContent":["/**\n * @license\n * Copyright Google LLC 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.dev/license\n */\n\nimport {Subject} from 'rxjs';\n\n/**\n * Class to be used to power selecting one or more options from a list.\n */\nexport class SelectionModel<T> {\n  /** Currently-selected values. */\n  private _selection = new Set<T>();\n\n  /** Keeps track of the deselected options that haven't been emitted by the change event. */\n  private _deselectedToEmit: T[] = [];\n\n  /** Keeps track of the selected options that haven't been emitted by the change event. */\n  private _selectedToEmit: T[] = [];\n\n  /** Cache for the array value of the selected items. */\n  private _selected: T[] | null = null;\n\n  /** Selected values. */\n  get selected(): T[] {\n    if (!this._selected) {\n      this._selected = Array.from(this._selection.values());\n    }\n\n    return this._selected;\n  }\n\n  /** Event emitted when the value has changed. */\n  readonly changed = new Subject<SelectionChange<T>>();\n\n  /**\n   * Exposes selection/deselection methods that work on array of values and don't expect a spread.\n   * This is useful in the cases where you may have a large collection of items that can't be\n   * easily spread into the existing methods without hitting browser limits.\n   */\n  readonly bulk: Readonly<{\n    select: (values: T[]) => boolean;\n    deselect: (values: T[]) => boolean;\n    setSelection: (values: T[]) => boolean;\n  }> = {\n    select: values => this._select(values),\n    deselect: values => this._deselect(values),\n    setSelection: values => this._setSelection(values),\n  };\n\n  constructor(\n    private _multiple = false,\n    initiallySelectedValues?: T[],\n    private _emitChanges = true,\n    public compareWith?: (o1: T, o2: T) => boolean,\n  ) {\n    if (initiallySelectedValues && initiallySelectedValues.length) {\n      if (_multiple) {\n        initiallySelectedValues.forEach(value => this._markSelected(value));\n      } else {\n        this._markSelected(initiallySelectedValues[0]);\n      }\n\n      // Clear the array in order to avoid firing the change event for preselected values.\n      this._selectedToEmit.length = 0;\n    }\n  }\n\n  /**\n   * Selects a value or an array of values.\n   * @param values The values to select\n   * @return Whether the selection changed as a result of this call\n   */\n  select(...values: T[]): boolean {\n    return this._select(values);\n  }\n\n  /**\n   * Deselects a value or an array of values.\n   * @param values The values to deselect\n   * @return Whether the selection changed as a result of this call\n   */\n  deselect(...values: T[]): boolean {\n    return this._deselect(values);\n  }\n\n  /**\n   * Sets the selected values\n   * @param values The new selected values\n   * @return Whether the selection changed as a result of this call\n   */\n  setSelection(...values: T[]): boolean {\n    return this._setSelection(values);\n  }\n\n  /**\n   * Toggles a value between selected and deselected.\n   * @param value The value to toggle\n   * @return Whether the selection changed as a result of this call\n   */\n  toggle(value: T): boolean {\n    return this.isSelected(value) ? this.deselect(value) : this.select(value);\n  }\n\n  /**\n   * Clears all of the selected values.\n   * @param flushEvent Whether to flush the changes in an event.\n   *   If false, the changes to the selection will be flushed along with the next event.\n   * @return Whether the selection changed as a result of this call\n   */\n  clear(flushEvent = true): boolean {\n    this._unmarkAll();\n    const changed = this._hasQueuedChanges();\n    if (flushEvent) {\n      this._emitChangeEvent();\n    }\n    return changed;\n  }\n\n  /**\n   * Determines whether a value is selected.\n   */\n  isSelected(value: T): boolean {\n    return this._selection.has(this._getConcreteValue(value));\n  }\n\n  /**\n   * Determines whether the model does not have a value.\n   */\n  isEmpty(): boolean {\n    return this._selection.size === 0;\n  }\n\n  /**\n   * Determines whether the model has a value.\n   */\n  hasValue(): boolean {\n    return !this.isEmpty();\n  }\n\n  /**\n   * Sorts the selected values based on a predicate function.\n   */\n  sort(predicate?: (a: T, b: T) => number): void {\n    if (this._multiple && this.selected) {\n      this._selected!.sort(predicate);\n    }\n  }\n\n  /**\n   * Gets whether multiple values can be selected.\n   */\n  isMultipleSelection() {\n    return this._multiple;\n  }\n\n  /** Selects an array of values. */\n  private _select(values: T[]) {\n    this._verifyValueAssignment(values);\n    values.forEach(value => this._markSelected(value));\n    const changed = this._hasQueuedChanges();\n    this._emitChangeEvent();\n    return changed;\n  }\n\n  /** Deselects an array of values. */\n  private _deselect(values: T[]) {\n    this._verifyValueAssignment(values);\n    values.forEach(value => this._unmarkSelected(value));\n    const changed = this._hasQueuedChanges();\n    this._emitChangeEvent();\n    return changed;\n  }\n\n  /** Sets the current selection from an array of items. */\n  private _setSelection(values: T[]) {\n    this._verifyValueAssignment(values);\n    const oldValues = this.selected;\n    const newSelectedSet = new Set(values.map(value => this._getConcreteValue(value)));\n    values.forEach(value => this._markSelected(value));\n    oldValues\n      .filter(value => !newSelectedSet.has(this._getConcreteValue(value, newSelectedSet)))\n      .forEach(value => this._unmarkSelected(value));\n    const changed = this._hasQueuedChanges();\n    this._emitChangeEvent();\n    return changed;\n  }\n\n  /** Emits a change event and clears the records of selected and deselected values. */\n  private _emitChangeEvent() {\n    // Clear the selected values so they can be re-cached.\n    this._selected = null;\n\n    if (this._selectedToEmit.length || this._deselectedToEmit.length) {\n      this.changed.next({\n        source: this,\n        added: this._selectedToEmit,\n        removed: this._deselectedToEmit,\n      });\n\n      this._deselectedToEmit = [];\n      this._selectedToEmit = [];\n    }\n  }\n\n  /** Selects a value. */\n  private _markSelected(value: T) {\n    value = this._getConcreteValue(value);\n    if (!this.isSelected(value)) {\n      if (!this._multiple) {\n        this._unmarkAll();\n      }\n\n      if (!this.isSelected(value)) {\n        this._selection.add(value);\n      }\n\n      if (this._emitChanges) {\n        this._selectedToEmit.push(value);\n      }\n    }\n  }\n\n  /** Deselects a value. */\n  private _unmarkSelected(value: T) {\n    value = this._getConcreteValue(value);\n    if (this.isSelected(value)) {\n      this._selection.delete(value);\n\n      if (this._emitChanges) {\n        this._deselectedToEmit.push(value);\n      }\n    }\n  }\n\n  /** Clears out the selected values. */\n  private _unmarkAll() {\n    if (!this.isEmpty()) {\n      this._selection.forEach(value => this._unmarkSelected(value));\n    }\n  }\n\n  /**\n   * Verifies the value assignment and throws an error if the specified value array is\n   * including multiple values while the selection model is not supporting multiple values.\n   */\n  private _verifyValueAssignment(values: T[]) {\n    if (values.length > 1 && !this._multiple && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw getMultipleValuesInSingleSelectionError();\n    }\n  }\n\n  /** Whether there are queued up change to be emitted. */\n  private _hasQueuedChanges() {\n    return !!(this._deselectedToEmit.length || this._selectedToEmit.length);\n  }\n\n  /** Returns a value that is comparable to inputValue by 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