ng-zorro-antd
Version:
An enterprise-class UI components based on Ant Design and Angular
610 lines • 52.7 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @license
* Copyright Alibaba.com 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://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE
*/
import { Injectable } from '@angular/core';
import { BehaviorSubject, Subject } from 'rxjs';
import { arraysEqual } from 'ng-zorro-antd/core';
import { isShowSearchObject } from './nz-cascader-definitions';
import { isChildOption, isParentOption } from './nz-cascader-utils';
/**
* All data is stored and parsed in NzCascaderService.
*/
export class NzCascaderService {
constructor() {
/**
* Activated options in each column.
*/
this.activatedOptions = [];
/**
* An array to store cascader items arranged in different layers.
*/
this.columns = [[]];
/**
* If user has entered searching mode.
*/
this.inSearchingMode = false;
/**
* Selected options would be output to user.
*/
this.selectedOptions = [];
this.values = []; // tslint:disable-line:no-any
// tslint:disable-line:no-any
this.$loading = new BehaviorSubject(false);
/**
* Emit an event to notify cascader it needs to redraw because activated or
* selected options are changed.
*/
this.$redraw = new Subject();
/**
* Emit an event when an option gets selected.
* Emit true if a leaf options is selected.
*/
this.$optionSelected = new Subject();
/**
* Emit an event to notify cascader it needs to quit searching mode.
* Only emit when user do select a searching option.
*/
this.$quitSearching = new Subject();
/**
* To hold columns before entering searching mode.
*/
this.columnsSnapshot = [[]];
/**
* To hold activated options before entering searching mode.
*/
this.activatedOptionsSnapshot = [];
}
/**
* Return cascader options in the first layer.
* @return {?}
*/
get nzOptions() {
return this.columns[0];
}
/**
* @return {?}
*/
ngOnDestroy() {
this.$redraw.complete();
this.$quitSearching.complete();
this.$optionSelected.complete();
this.$loading.complete();
}
/**
* Make sure that value matches what is displayed in the dropdown.
* @param {?=} first
* @return {?}
*/
syncOptions(first = false) {
/** @type {?} */
const values = this.values;
/** @type {?} */
const hasValue = values && values.length;
/** @type {?} */
const lastColumnIndex = values.length - 1;
/** @type {?} */
const initColumnWithIndex = (/**
* @param {?} columnIndex
* @return {?}
*/
(columnIndex) => {
/** @type {?} */
const activatedOptionSetter = (/**
* @return {?}
*/
() => {
/** @type {?} */
const currentValue = values[columnIndex];
if (!currentValue) {
this.$redraw.next();
return;
}
/** @type {?} */
const option = this.findOptionWithValue(columnIndex, values[columnIndex]) ||
(typeof currentValue === 'object'
? currentValue
: {
[`${this.cascaderComponent.nzValueProperty}`]: currentValue,
[`${this.cascaderComponent.nzLabelProperty}`]: currentValue
});
this.setOptionActivated(option, columnIndex, false, false);
if (columnIndex < lastColumnIndex) {
initColumnWithIndex(columnIndex + 1);
}
else {
this.dropBehindColumns(columnIndex);
this.selectedOptions = [...this.activatedOptions];
this.$redraw.next();
}
});
if (this.isLoaded(columnIndex) || !this.cascaderComponent.nzLoadData) {
activatedOptionSetter();
}
else {
/** @type {?} */
const option = this.activatedOptions[columnIndex - 1] || {};
this.loadChildren(option, columnIndex - 1, activatedOptionSetter);
}
});
this.activatedOptions = [];
this.selectedOptions = [];
if (first && this.cascaderComponent.nzLoadData && !hasValue) {
return;
}
else {
initColumnWithIndex(0);
}
}
/**
* Bind cascader component so this service could use inputs.
* @param {?} cascaderComponent
* @return {?}
*/
withComponent(cascaderComponent) {
this.cascaderComponent = cascaderComponent;
}
/**
* Reset all options. Rebuild searching options if in searching mode.
* @param {?} options
* @return {?}
*/
withOptions(options) {
this.columnsSnapshot = this.columns = options && options.length ? [options] : [];
if (this.inSearchingMode) {
this.prepareSearchOptions(this.cascaderComponent.inputValue);
}
else if (this.columns.length) {
this.syncOptions();
}
}
/**
* Try to set a option as activated.
* @param {?} option Cascader option
* @param {?} columnIndex Of which column this option is in
* @param {?=} select Select
* @param {?=} loadingChildren Try to load children asynchronously.
* @return {?}
*/
setOptionActivated(option, columnIndex, select = false, loadingChildren = true) {
if (option.disabled) {
return;
}
this.activatedOptions[columnIndex] = option;
this.trackAncestorActivatedOptions(columnIndex);
this.dropBehindActivatedOptions(columnIndex);
/** @type {?} */
const isParent = isParentOption(option);
if (isParent) {
// Parent option that has children.
this.setColumnData((/** @type {?} */ (option.children)), columnIndex + 1, option);
}
else if (!option.isLeaf && loadingChildren) {
// Parent option that should try to load children asynchronously.
this.loadChildren(option, columnIndex);
}
else if (option.isLeaf) {
// Leaf option.
this.dropBehindColumns(columnIndex);
}
// Actually perform selection to make an options not only activated but also selected.
if (select) {
this.setOptionSelected(option, columnIndex);
}
this.$redraw.next();
}
/**
* Set a searching option as activated, finishing up things.
* @param {?} option
* @return {?}
*/
setSearchOptionSelected(option) {
this.activatedOptions = [option];
this.selectedOptions = [...option.path];
this.prepareEmitValue();
this.$redraw.next();
this.$optionSelected.next({ option, index: 0 });
setTimeout((/**
* @return {?}
*/
() => {
// Reset data and tell UI only to remove input and reset dropdown width style.
this.$quitSearching.next();
this.$redraw.next();
this.inSearchingMode = false;
this.columns = [...this.columnsSnapshot];
this.activatedOptions = [...this.selectedOptions];
}), 200);
}
/**
* Filter cascader options to reset `columns`.
* @param {?} searchValue The string user wants to search.
* @return {?}
*/
prepareSearchOptions(searchValue) {
/** @type {?} */
const results = [];
// Search results only have one layer.
/** @type {?} */
const path = [];
/** @type {?} */
const defaultFilter = (/**
* @param {?} i
* @param {?} p
* @return {?}
*/
(i, p) => {
return p.some((/**
* @param {?} o
* @return {?}
*/
o => {
/** @type {?} */
const label = this.getOptionLabel(o);
return !!label && label.indexOf(i) !== -1;
}));
});
/** @type {?} */
const showSearch = this.cascaderComponent.nzShowSearch;
/** @type {?} */
const filter = isShowSearchObject(showSearch) && showSearch.filter ? showSearch.filter : defaultFilter;
/** @type {?} */
const sorter = isShowSearchObject(showSearch) && showSearch.sorter ? showSearch.sorter : null;
/** @type {?} */
const loopChild = (/**
* @param {?} node
* @param {?=} forceDisabled
* @return {?}
*/
(node, forceDisabled = false) => {
path.push(node);
/** @type {?} */
const cPath = Array.from(path);
if (filter(searchValue, cPath)) {
/** @type {?} */
const disabled = forceDisabled || node.disabled;
/** @type {?} */
const option = {
disabled,
isLeaf: true,
path: cPath,
[this.cascaderComponent.nzLabelProperty]: cPath.map((/**
* @param {?} p
* @return {?}
*/
p => this.getOptionLabel(p))).join(' / ')
};
results.push(option);
}
path.pop();
});
/** @type {?} */
const loopParent = (/**
* @param {?} node
* @param {?=} forceDisabled
* @return {?}
*/
(node, forceDisabled = false) => {
/** @type {?} */
const disabled = forceDisabled || node.disabled;
path.push(node);
(/** @type {?} */ (node.children)).forEach((/**
* @param {?} sNode
* @return {?}
*/
sNode => {
if (!sNode.parent) {
sNode.parent = node;
}
if (!sNode.isLeaf) {
loopParent(sNode, disabled);
}
if (sNode.isLeaf || !sNode.children || !sNode.children.length) {
loopChild(sNode, disabled);
}
}));
path.pop();
});
if (!this.columnsSnapshot.length) {
this.columns = [[]];
return;
}
this.columnsSnapshot[0].forEach((/**
* @param {?} o
* @return {?}
*/
o => (isChildOption(o) ? loopChild(o) : loopParent(o))));
if (sorter) {
results.sort((/**
* @param {?} a
* @param {?} b
* @return {?}
*/
(a, b) => sorter(a.path, b.path, searchValue)));
}
this.columns = [results];
}
/**
* Toggle searching mode by UI. It deals with things not directly related to UI.
* @param {?} toSearching If this cascader is entering searching mode
* @return {?}
*/
toggleSearchingMode(toSearching) {
this.inSearchingMode = toSearching;
if (toSearching) {
this.activatedOptionsSnapshot = [...this.activatedOptions];
this.activatedOptions = [];
this.selectedOptions = [];
this.$redraw.next();
}
else {
// User quit searching mode without selecting an option.
this.activatedOptions = [...this.activatedOptionsSnapshot];
this.selectedOptions = [...this.activatedOptions];
this.columns = [...this.columnsSnapshot];
this.syncOptions();
this.$redraw.next();
}
}
/**
* @param {?} option
* @param {?} index
* @return {?}
*/
setOptionSelected(option, index) {
/** @type {?} */
const changeOn = this.cascaderComponent.nzChangeOn;
/** @type {?} */
const shouldPerformSelection = (/**
* @param {?} o
* @param {?} i
* @return {?}
*/
(o, i) => {
return typeof changeOn === 'function' ? changeOn(o, i) : false;
});
if (option.isLeaf || this.cascaderComponent.nzChangeOnSelect || shouldPerformSelection(option, index)) {
this.selectedOptions = [...this.activatedOptions];
this.prepareEmitValue();
this.$redraw.next();
this.$optionSelected.next({ option, index });
}
}
/**
* Clear selected options.
* @return {?}
*/
clear() {
this.values = [];
this.selectedOptions = [];
this.activatedOptions = [];
this.dropBehindColumns(0);
this.prepareEmitValue();
this.$redraw.next();
this.$optionSelected.next(null);
}
/**
* @param {?} o
* @return {?}
*/
getOptionLabel(o) {
return (/** @type {?} */ (o[this.cascaderComponent.nzLabelProperty || 'label']));
}
// tslint:disable-next-line:no-any
/**
* @param {?} o
* @return {?}
*/
getOptionValue(o) {
return o[this.cascaderComponent.nzValueProperty || 'value'];
}
/**
* Try to insert options into a column.
* @private
* @param {?} options Options to insert
* @param {?} columnIndex Position
* @param {?} parent
* @return {?}
*/
setColumnData(options, columnIndex, parent) {
/** @type {?} */
const existingOptions = this.columns[columnIndex];
if (!arraysEqual(existingOptions, options)) {
options.forEach((/**
* @param {?} o
* @return {?}
*/
o => (o.parent = parent)));
this.columns[columnIndex] = options;
this.dropBehindColumns(columnIndex);
}
}
/**
* Set all ancestor options as activated.
* @private
* @param {?} startIndex
* @return {?}
*/
trackAncestorActivatedOptions(startIndex) {
for (let i = startIndex - 1; i >= 0; i--) {
if (!this.activatedOptions[i]) {
this.activatedOptions[i] = (/** @type {?} */ (this.activatedOptions[i + 1].parent));
}
}
}
/**
* @private
* @param {?} lastReserveIndex
* @return {?}
*/
dropBehindActivatedOptions(lastReserveIndex) {
this.activatedOptions = this.activatedOptions.splice(0, lastReserveIndex + 1);
}
/**
* @private
* @param {?} lastReserveIndex
* @return {?}
*/
dropBehindColumns(lastReserveIndex) {
if (lastReserveIndex < this.columns.length - 1) {
this.columns = this.columns.slice(0, lastReserveIndex + 1);
}
}
/**
* Load children of an option asynchronously.
* @param {?} option
* @param {?} columnIndex
* @param {?=} success
* @param {?=} failure
* @return {?}
*/
loadChildren(option, // tslint:disable-line:no-any
columnIndex, success, failure) {
/** @type {?} */
const loadFn = this.cascaderComponent.nzLoadData;
if (loadFn) {
// If there isn't any option in columns.
this.$loading.next(columnIndex < 0);
if (typeof option === 'object') {
option.loading = true;
}
loadFn(option, columnIndex).then((/**
* @return {?}
*/
() => {
option.loading = false;
if (option.children) {
this.setColumnData(option.children, columnIndex + 1, option);
}
if (success) {
success();
}
this.$loading.next(false);
this.$redraw.next();
}), (/**
* @return {?}
*/
() => {
option.loading = false;
option.isLeaf = true;
if (failure) {
failure();
}
this.$redraw.next();
}));
}
}
/**
* @private
* @param {?} index
* @return {?}
*/
isLoaded(index) {
return this.columns[index] && this.columns[index].length > 0;
}
/**
* Find a option that has a given value in a given column.
* @private
* @param {?} columnIndex
* @param {?} value
* @return {?}
*/
findOptionWithValue(columnIndex, value // tslint:disable-line:no-any
) {
/** @type {?} */
const targetColumn = this.columns[columnIndex];
if (targetColumn) {
/** @type {?} */
const v = typeof value === 'object' ? this.getOptionValue(value) : value;
return (/** @type {?} */ (targetColumn.find((/**
* @param {?} o
* @return {?}
*/
o => v === this.getOptionValue(o)))));
}
return null;
}
/**
* @private
* @return {?}
*/
prepareEmitValue() {
this.values = this.selectedOptions.map((/**
* @param {?} o
* @return {?}
*/
o => this.getOptionValue(o)));
}
}
NzCascaderService.decorators = [
{ type: Injectable }
];
if (false) {
/**
* Activated options in each column.
* @type {?}
*/
NzCascaderService.prototype.activatedOptions;
/**
* An array to store cascader items arranged in different layers.
* @type {?}
*/
NzCascaderService.prototype.columns;
/**
* If user has entered searching mode.
* @type {?}
*/
NzCascaderService.prototype.inSearchingMode;
/**
* Selected options would be output to user.
* @type {?}
*/
NzCascaderService.prototype.selectedOptions;
/** @type {?} */
NzCascaderService.prototype.values;
/** @type {?} */
NzCascaderService.prototype.$loading;
/**
* Emit an event to notify cascader it needs to redraw because activated or
* selected options are changed.
* @type {?}
*/
NzCascaderService.prototype.$redraw;
/**
* Emit an event when an option gets selected.
* Emit true if a leaf options is selected.
* @type {?}
*/
NzCascaderService.prototype.$optionSelected;
/**
* Emit an event to notify cascader it needs to quit searching mode.
* Only emit when user do select a searching option.
* @type {?}
*/
NzCascaderService.prototype.$quitSearching;
/**
* To hold columns before entering searching mode.
* @type {?}
* @private
*/
NzCascaderService.prototype.columnsSnapshot;
/**
* To hold activated options before entering searching mode.
* @type {?}
* @private
*/
NzCascaderService.prototype.activatedOptionsSnapshot;
/**
* @type {?}
* @private
*/
NzCascaderService.prototype.cascaderComponent;
}
//# 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* @license\n * Copyright Alibaba.com 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://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE\n */\n\nimport { Injectable, OnDestroy } from '@angular/core';\nimport { BehaviorSubject, Subject } from 'rxjs';\n\nimport { arraysEqual } from 'ng-zorro-antd/core';\n\nimport {\n  isShowSearchObject,\n  CascaderOption,\n  CascaderSearchOption,\n  NzCascaderComponentAsSource,\n  NzCascaderFilter\n} from './nz-cascader-definitions';\nimport { isChildOption, isParentOption } from './nz-cascader-utils';\n\n/**\n * All data is stored and parsed in NzCascaderService.\n */\n@Injectable()\nexport class NzCascaderService implements OnDestroy {\n  /** Activated options in each column. */\n  activatedOptions: CascaderOption[] = [];\n\n  /** An array to store cascader items arranged in different layers. */\n  columns: CascaderOption[][] = [[]];\n\n  /** If user has entered searching mode. */\n  inSearchingMode = false;\n\n  /** Selected options would be output to user. */\n  selectedOptions: CascaderOption[] = [];\n\n  values: any[] = []; // tslint:disable-line:no-any\n\n  readonly $loading = new BehaviorSubject<boolean>(false);\n\n  /**\n   * Emit an event to notify cascader it needs to redraw because activated or\n   * selected options are changed.\n   */\n  readonly $redraw = new Subject<void>();\n\n  /**\n   * Emit an event when an option gets selected.\n   * Emit true if a leaf options is selected.\n   */\n  readonly $optionSelected = new Subject<{\n    option: CascaderOption;\n    index: number;\n  } | null>();\n\n  /**\n   * Emit an event to notify cascader it needs to quit searching mode.\n   * Only emit when user do select a searching option.\n   */\n  readonly $quitSearching = new Subject<void>();\n\n  /** To hold columns before entering searching mode. */\n  private columnsSnapshot: CascaderOption[][] = [[]];\n\n  /** To hold activated options before entering searching mode. */\n  private activatedOptionsSnapshot: CascaderOption[] = [];\n\n  private cascaderComponent: NzCascaderComponentAsSource;\n\n  /** Return cascader options in the first layer. */\n  get nzOptions(): CascaderOption[] {\n    return this.columns[0];\n  }\n\n  ngOnDestroy(): void {\n    this.$redraw.complete();\n    this.$quitSearching.complete();\n    this.$optionSelected.complete();\n    this.$loading.complete();\n  }\n\n  /**\n   * Make sure that value matches what is displayed in the dropdown.\n   */\n  syncOptions(first: boolean = false): void {\n    const values = this.values;\n    const hasValue = values && values.length;\n    const lastColumnIndex = values.length - 1;\n    const initColumnWithIndex = (columnIndex: number) => {\n      const activatedOptionSetter = () => {\n        const currentValue = values[columnIndex];\n\n        if (!currentValue) {\n          this.$redraw.next();\n          return;\n        }\n\n        const option =\n          this.findOptionWithValue(columnIndex, values[columnIndex]) ||\n          (typeof currentValue === 'object'\n            ? currentValue\n            : {\n                [`${this.cascaderComponent.nzValueProperty}`]: currentValue,\n                [`${this.cascaderComponent.nzLabelProperty}`]: currentValue\n              });\n\n        this.setOptionActivated(option, columnIndex, false, false);\n\n        if (columnIndex < lastColumnIndex) {\n          initColumnWithIndex(columnIndex + 1);\n        } else {\n          this.dropBehindColumns(columnIndex);\n          this.selectedOptions = [...this.activatedOptions];\n          this.$redraw.next();\n        }\n      };\n\n      if (this.isLoaded(columnIndex) || !this.cascaderComponent.nzLoadData) {\n        activatedOptionSetter();\n      } else {\n        const option = this.activatedOptions[columnIndex - 1] || {};\n        this.loadChildren(option, columnIndex - 1, activatedOptionSetter);\n      }\n    };\n\n    this.activatedOptions = [];\n    this.selectedOptions = [];\n\n    if (first && this.cascaderComponent.nzLoadData && !hasValue) {\n      return;\n    } else {\n      initColumnWithIndex(0);\n    }\n  }\n\n  /**\n   * Bind cascader component so this service could use inputs.\n   */\n  withComponent(cascaderComponent: NzCascaderComponentAsSource): void {\n    this.cascaderComponent = cascaderComponent;\n  }\n\n  /**\n   * Reset all options. Rebuild searching options if in searching mode.\n   */\n  withOptions(options: CascaderOption[] | null): void {\n    this.columnsSnapshot = this.columns = options && options.length ? [options] : [];\n\n    if (this.inSearchingMode) {\n      this.prepareSearchOptions(this.cascaderComponent.inputValue);\n    } else if (this.columns.length) {\n      this.syncOptions();\n    }\n  }\n\n  /**\n   * Try to set a option as activated.\n   * @param option Cascader option\n   * @param columnIndex Of which column this option is in\n   * @param select Select\n   * @param loadingChildren Try to load children asynchronously.\n   */\n  setOptionActivated(\n    option: CascaderOption,\n    columnIndex: number,\n    select: boolean = false,\n    loadingChildren: boolean = true\n  ): void {\n    if (option.disabled) {\n      return;\n    }\n\n    this.activatedOptions[columnIndex] = option;\n    this.trackAncestorActivatedOptions(columnIndex);\n    this.dropBehindActivatedOptions(columnIndex);\n\n    const isParent = isParentOption(option);\n\n    if (isParent) {\n      // Parent option that has children.\n      this.setColumnData(option.children!, columnIndex + 1, option);\n    } else if (!option.isLeaf && loadingChildren) {\n      // Parent option that should try to load children asynchronously.\n      this.loadChildren(option, columnIndex);\n    } else if (option.isLeaf) {\n      // Leaf option.\n      this.dropBehindColumns(columnIndex);\n    }\n\n    // Actually perform selection to make an options not only activated but also selected.\n    if (select) {\n      this.setOptionSelected(option, columnIndex);\n    }\n\n    this.$redraw.next();\n  }\n\n  /**\n   * Set a searching option as activated, finishing up things.\n   * @param option\n   */\n  setSearchOptionSelected(option: CascaderSearchOption): void {\n    this.activatedOptions = [option];\n    this.selectedOptions = [...option.path];\n    this.prepareEmitValue();\n    this.$redraw.next();\n    this.$optionSelected.next({ option, index: 0 });\n\n    setTimeout(() => {\n      // Reset data and tell UI only to remove input and reset dropdown width style.\n      this.$quitSearching.next();\n      this.$redraw.next();\n      this.inSearchingMode = false;\n      this.columns = [...this.columnsSnapshot];\n      this.activatedOptions = [...this.selectedOptions];\n    }, 200);\n  }\n\n  /**\n   * Filter cascader options to reset `columns`.\n   * @param searchValue The string user wants to search.\n   */\n  prepareSearchOptions(searchValue: string): void {\n    const results: CascaderOption[] = []; // Search results only have one layer.\n    const path: CascaderOption[] = [];\n    const defaultFilter: NzCascaderFilter = (i, p) => {\n      return p.some(o => {\n        const label = this.getOptionLabel(o);\n        return !!label && label.indexOf(i) !== -1;\n      });\n    };\n    const showSearch = this.cascaderComponent.nzShowSearch;\n    const filter = isShowSearchObject(showSearch) && showSearch.filter ? showSearch.filter : defaultFilter;\n    const sorter = isShowSearchObject(showSearch) && showSearch.sorter ? showSearch.sorter : null;\n    const loopChild = (node: CascaderOption, forceDisabled = false) => {\n      path.push(node);\n      const cPath = Array.from(path);\n      if (filter(searchValue, cPath)) {\n        const disabled = forceDisabled || node.disabled;\n        const option: CascaderSearchOption = {\n          disabled,\n          isLeaf: true,\n          path: cPath,\n          [this.cascaderComponent.nzLabelProperty]: cPath.map(p => this.getOptionLabel(p)).join(' / ')\n        };\n        results.push(option);\n      }\n      path.pop();\n    };\n    const loopParent = (node: CascaderOption, forceDisabled = false) => {\n      const disabled = forceDisabled || node.disabled;\n      path.push(node);\n      node.children!.forEach(sNode => {\n        if (!sNode.parent) {\n          sNode.parent = node;\n        }\n        if (!sNode.isLeaf) {\n          loopParent(sNode, disabled);\n        }\n        if (sNode.isLeaf || !sNode.children || !sNode.children.length) {\n          loopChild(sNode, disabled);\n        }\n      });\n      path.pop();\n    };\n\n    if (!this.columnsSnapshot.length) {\n      this.columns = [[]];\n      return;\n    }\n\n    this.columnsSnapshot[0].forEach(o => (isChildOption(o) ? loopChild(o) : loopParent(o)));\n\n    if (sorter) {\n      results.sort((a, b) => sorter(a.path, b.path, searchValue));\n    }\n\n    this.columns = [results];\n  }\n\n  /**\n   * Toggle searching mode by UI. It deals with things not directly related to UI.\n   * @param toSearching If this cascader is entering searching mode\n   */\n  toggleSearchingMode(toSearching: boolean): void {\n    this.inSearchingMode = toSearching;\n\n    if (toSearching) {\n      this.activatedOptionsSnapshot = [...this.activatedOptions];\n      this.activatedOptions = [];\n      this.selectedOptions = [];\n      this.$redraw.next();\n    } else {\n      // User quit searching mode without selecting an option.\n      this.activatedOptions = [...this.activatedOptionsSnapshot];\n      this.selectedOptions = [...this.activatedOptions];\n      this.columns = [...this.columnsSnapshot];\n      this.syncOptions();\n      this.$redraw.next();\n    }\n  }\n\n  setOptionSelected(option: CascaderOption, index: number): void {\n    const changeOn = this.cascaderComponent.nzChangeOn;\n    const shouldPerformSelection = (o: CascaderOption, i: number): boolean => {\n      return typeof changeOn === 'function' ? changeOn(o, i) : false;\n    };\n\n    if (option.isLeaf || this.cascaderComponent.nzChangeOnSelect || shouldPerformSelection(option, index)) {\n      this.selectedOptions = [...this.activatedOptions];\n      this.prepareEmitValue();\n      this.$redraw.next();\n      this.$optionSelected.next({ option, index });\n    }\n  }\n\n  /**\n   * Clear selected options.\n   */\n  clear(): void {\n    this.values = [];\n    this.selectedOptions = [];\n    this.activatedOptions = [];\n    this.dropBehindColumns(0);\n    this.prepareEmitValue();\n    this.$redraw.next();\n    this.$optionSelected.next(null);\n  }\n\n  getOptionLabel(o: CascaderOption): string {\n    return o[this.cascaderComponent.nzLabelProperty || 'label'] as string;\n  }\n\n  // tslint:disable-next-line:no-any\n  getOptionValue(o: CascaderOption): any {\n    return o[this.cascaderComponent.nzValueProperty || 'value'];\n  }\n\n  /**\n   * Try to insert options into a column.\n   * @param options Options to insert\n   * @param columnIndex Position\n   */\n  private setColumnData(options: CascaderOption[], columnIndex: number, parent: CascaderOption): void {\n    const existingOptions = this.columns[columnIndex];\n    if (!arraysEqual(existingOptions, options)) {\n      options.forEach(o => (o.parent = parent));\n      this.columns[columnIndex] = options;\n      this.dropBehindColumns(columnIndex);\n    }\n  }\n\n  /**\n   * Set all ancestor options as activated.\n   */\n  private trackAncestorActivatedOptions(startIndex: number): void {\n    for (let i = startIndex - 1; i >= 0; i--) {\n      if (!this.activatedOptions[i]) {\n        this.activatedOptions[i] = this.activatedOptions[i + 1].parent!;\n      }\n    }\n  }\n\n  private dropBehindActivatedOptions(lastReserveIndex: number): void {\n    this.activatedOptions = this.activatedOptions.splice(0, lastReserveIndex + 1);\n  }\n\n  private dropBehindColumns(lastReserveIndex: number): void {\n    if (lastReserveIndex < this.columns.length - 1) {\n      this.columns = this.columns.slice(0, lastReserveIndex + 1);\n    }\n  }\n\n  /**\n   * Load children of an option asynchronously.\n   */\n  loadChildren(\n    option: CascaderOption | any, // tslint:disable-line:no-any\n    columnIndex: number,\n    success?: VoidFunction,\n    failure?: VoidFunction\n  ): void {\n    const loadFn = this.cascaderComponent.nzLoadData;\n\n    if (loadFn) {\n      // If there isn't any option in columns.\n      this.$loading.next(columnIndex < 0);\n\n      if (typeof option === 'object') {\n        option.loading = true;\n      }\n\n      loadFn(option, columnIndex).then(\n        () => {\n          option.loading = false;\n          if (option.children) {\n            this.setColumnData(option.children, columnIndex + 1, option);\n          }\n          if (success) {\n            success();\n          }\n          this.$loading.next(false);\n          this.$redraw.next();\n        },\n        () => {\n          option.loading = false;\n          option.isLeaf = true;\n          if (failure) {\n            failure();\n          }\n          this.$redraw.next();\n        }\n      );\n    }\n  }\n\n  private isLoaded(index: number): boolean {\n    return this.columns[index] && this.columns[index].length > 0;\n  }\n\n  /**\n   * Find a option that has a given value in a given column.\n   */\n  private findOptionWithValue(\n    columnIndex: number,\n    value: CascaderOption | any // tslint:disable-line:no-any\n  ): CascaderOption | null {\n    const targetColumn = this.columns[columnIndex];\n    if (targetColumn) {\n      const v = typeof value === 'object' ? this.getOptionValue(value) : value;\n      return targetColumn.find(o => v === this.getOptionValue(o))!;\n    }\n    return null;\n  }\n\n  private prepareEmitValue(): void {\n    this.values = this.selectedOptions.map(o => this.getOptionValue(o));\n  }\n}\n"]}