@angular/cdk
Version:
Angular Material Component Development Kit
182 lines • 18.8 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 { Subject } from 'rxjs';
/**
* Class to be used to power selecting one or more options from a list.
*/
var SelectionModel = /** @class */ (function () {
function SelectionModel(_multiple, initiallySelectedValues, _emitChanges) {
var _this = this;
if (_multiple === void 0) { _multiple = false; }
if (_emitChanges === void 0) { _emitChanges = true; }
this._multiple = _multiple;
this._emitChanges = _emitChanges;
/** Currently-selected values. */
this._selection = new Set();
/** Keeps track of the deselected options that haven't been emitted by the change event. */
this._deselectedToEmit = [];
/** Keeps track of the selected options that haven't been emitted by the change event. */
this._selectedToEmit = [];
/** Event emitted when the value has changed. */
this.changed = new Subject();
if (initiallySelectedValues && initiallySelectedValues.length) {
if (_multiple) {
initiallySelectedValues.forEach(function (value) { return _this._markSelected(value); });
}
else {
this._markSelected(initiallySelectedValues[0]);
}
// Clear the array in order to avoid firing the change event for preselected values.
this._selectedToEmit.length = 0;
}
}
Object.defineProperty(SelectionModel.prototype, "selected", {
/** Selected values. */
get: function () {
if (!this._selected) {
this._selected = Array.from(this._selection.values());
}
return this._selected;
},
enumerable: true,
configurable: true
});
/**
* Selects a value or an array of values.
*/
SelectionModel.prototype.select = function () {
var _this = this;
var values = [];
for (var _i = 0; _i < arguments.length; _i++) {
values[_i] = arguments[_i];
}
this._verifyValueAssignment(values);
values.forEach(function (value) { return _this._markSelected(value); });
this._emitChangeEvent();
};
/**
* Deselects a value or an array of values.
*/
SelectionModel.prototype.deselect = function () {
var _this = this;
var values = [];
for (var _i = 0; _i < arguments.length; _i++) {
values[_i] = arguments[_i];
}
this._verifyValueAssignment(values);
values.forEach(function (value) { return _this._unmarkSelected(value); });
this._emitChangeEvent();
};
/**
* Toggles a value between selected and deselected.
*/
SelectionModel.prototype.toggle = function (value) {
this.isSelected(value) ? this.deselect(value) : this.select(value);
};
/**
* Clears all of the selected values.
*/
SelectionModel.prototype.clear = function () {
this._unmarkAll();
this._emitChangeEvent();
};
/**
* Determines whether a value is selected.
*/
SelectionModel.prototype.isSelected = function (value) {
return this._selection.has(value);
};
/**
* Determines whether the model does not have a value.
*/
SelectionModel.prototype.isEmpty = function () {
return this._selection.size === 0;
};
/**
* Determines whether the model has a value.
*/
SelectionModel.prototype.hasValue = function () {
return !this.isEmpty();
};
/**
* Sorts the selected values based on a predicate function.
*/
SelectionModel.prototype.sort = function (predicate) {
if (this._multiple && this.selected) {
this._selected.sort(predicate);
}
};
/**
* Gets whether multiple values can be selected.
*/
SelectionModel.prototype.isMultipleSelection = function () {
return this._multiple;
};
/** Emits a change event and clears the records of selected and deselected values. */
SelectionModel.prototype._emitChangeEvent = function () {
// Clear the selected values so they can be re-cached.
this._selected = null;
if (this._selectedToEmit.length || this._deselectedToEmit.length) {
this.changed.next({
source: this,
added: this._selectedToEmit,
removed: this._deselectedToEmit
});
this._deselectedToEmit = [];
this._selectedToEmit = [];
}
};
/** Selects a value. */
SelectionModel.prototype._markSelected = function (value) {
if (!this.isSelected(value)) {
if (!this._multiple) {
this._unmarkAll();
}
this._selection.add(value);
if (this._emitChanges) {
this._selectedToEmit.push(value);
}
}
};
/** Deselects a value. */
SelectionModel.prototype._unmarkSelected = function (value) {
if (this.isSelected(value)) {
this._selection.delete(value);
if (this._emitChanges) {
this._deselectedToEmit.push(value);
}
}
};
/** Clears out the selected values. */
SelectionModel.prototype._unmarkAll = function () {
var _this = this;
if (!this.isEmpty()) {
this._selection.forEach(function (value) { return _this._unmarkSelected(value); });
}
};
/**
* Verifies the value assignment and throws an error if the specified value array is
* including multiple values while the selection model is not supporting multiple values.
*/
SelectionModel.prototype._verifyValueAssignment = function (values) {
if (values.length > 1 && !this._multiple) {
throw getMultipleValuesInSingleSelectionError();
}
};
return SelectionModel;
}());
export { SelectionModel };
/**
* Returns an error that reports that multiple values are passed into a selection model
* with a single value.
* @docs-private
*/
export function getMultipleValuesInSingleSelectionError() {
return Error('Cannot pass multiple values into SelectionModel with single-value mode.');
}
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* @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.io/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;\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  changed: Subject<SelectionChange<T>> = new Subject();\n\n  constructor(\n    private _multiple = false,\n    initiallySelectedValues?: T[],\n    private _emitChanges = true) {\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   */\n  select(...values: T[]): void {\n    this._verifyValueAssignment(values);\n    values.forEach(value => this._markSelected(value));\n    this._emitChangeEvent();\n  }\n\n  /**\n   * Deselects a value or an array of values.\n   */\n  deselect(...values: T[]): void {\n    this._verifyValueAssignment(values);\n    values.forEach(value => this._unmarkSelected(value));\n    this._emitChangeEvent();\n  }\n\n  /**\n   * Toggles a value between selected and deselected.\n   */\n  toggle(value: T): void {\n    this.isSelected(value) ? this.deselect(value) : this.select(value);\n  }\n\n  /**\n   * Clears all of the selected values.\n   */\n  clear(): void {\n    this._unmarkAll();\n    this._emitChangeEvent();\n  }\n\n  /**\n   * Determines whether a value is selected.\n   */\n  isSelected(value: T): boolean {\n    return this._selection.has(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  /** 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    if (!this.isSelected(value)) {\n      if (!this._multiple) {\n        this._unmarkAll();\n      }\n\n      this._selection.add(value);\n\n      if (this._emitChanges) {\n        this._selectedToEmit.push(value);\n      }\n    }\n  }\n\n  /** Deselects a value. */\n  private _unmarkSelected(value: T) {\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) {\n      throw getMultipleValuesInSingleSelectionError();\n    }\n  }\n}\n\n/**\n * Event emitted when the value of a MatSelectionModel has changed.\n * @docs-private\n */\nexport interface SelectionChange<T> {\n  /** Model that dispatched the event. */\n  source: SelectionModel<T>;\n  /** Options that were added to the model. */\n  added: T[];\n  /** Options that were removed from the model. */\n  removed: T[];\n}\n\n/**\n * Returns an error that reports that multiple values are passed into a selection model\n * with a single value.\n * @docs-private\n */\nexport function getMultipleValuesInSingleSelectionError() {\n  return Error('Cannot pass multiple values into SelectionModel with single-value mode.');\n}\n"]}