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ng-zorro-antd

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An enterprise-class UI components based on Ant Design and Angular

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/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
import * as tslib_1 from "tslib";
/**
 * @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.
 */
var NzCascaderService = /** @class */ (function () {
    function NzCascaderService() {
        /**
         * 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 = [];
    }
    Object.defineProperty(NzCascaderService.prototype, "nzOptions", {
        /** Return cascader options in the first layer. */
        get: /**
         * Return cascader options in the first layer.
         * @return {?}
         */
        function () {
            return this.columns[0];
        },
        enumerable: true,
        configurable: true
    });
    /**
     * @return {?}
     */
    NzCascaderService.prototype.ngOnDestroy = /**
     * @return {?}
     */
    function () {
        this.$redraw.complete();
        this.$quitSearching.complete();
        this.$optionSelected.complete();
        this.$loading.complete();
    };
    /**
     * Make sure that value matches what is displayed in the dropdown.
     */
    /**
     * Make sure that value matches what is displayed in the dropdown.
     * @param {?=} first
     * @return {?}
     */
    NzCascaderService.prototype.syncOptions = /**
     * Make sure that value matches what is displayed in the dropdown.
     * @param {?=} first
     * @return {?}
     */
    function (first) {
        var _this = this;
        if (first === void 0) { first = false; }
        /** @type {?} */
        var values = this.values;
        /** @type {?} */
        var hasValue = values && values.length;
        /** @type {?} */
        var lastColumnIndex = values.length - 1;
        /** @type {?} */
        var initColumnWithIndex = (/**
         * @param {?} columnIndex
         * @return {?}
         */
        function (columnIndex) {
            /** @type {?} */
            var activatedOptionSetter = (/**
             * @return {?}
             */
            function () {
                var _a;
                /** @type {?} */
                var currentValue = values[columnIndex];
                if (!currentValue) {
                    _this.$redraw.next();
                    return;
                }
                /** @type {?} */
                var option = _this.findOptionWithValue(columnIndex, values[columnIndex]) ||
                    (typeof currentValue === 'object'
                        ? currentValue
                        : (_a = {},
                            _a["" + _this.cascaderComponent.nzValueProperty] = currentValue,
                            _a["" + _this.cascaderComponent.nzLabelProperty] = currentValue,
                            _a));
                _this.setOptionActivated(option, columnIndex, false, false);
                if (columnIndex < lastColumnIndex) {
                    initColumnWithIndex(columnIndex + 1);
                }
                else {
                    _this.dropBehindColumns(columnIndex);
                    _this.selectedOptions = tslib_1.__spread(_this.activatedOptions);
                    _this.$redraw.next();
                }
            });
            if (_this.isLoaded(columnIndex) || !_this.cascaderComponent.nzLoadData) {
                activatedOptionSetter();
            }
            else {
                /** @type {?} */
                var 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.
     */
    /**
     * Bind cascader component so this service could use inputs.
     * @param {?} cascaderComponent
     * @return {?}
     */
    NzCascaderService.prototype.withComponent = /**
     * Bind cascader component so this service could use inputs.
     * @param {?} cascaderComponent
     * @return {?}
     */
    function (cascaderComponent) {
        this.cascaderComponent = cascaderComponent;
    };
    /**
     * Reset all options. Rebuild searching options if in searching mode.
     */
    /**
     * Reset all options. Rebuild searching options if in searching mode.
     * @param {?} options
     * @return {?}
     */
    NzCascaderService.prototype.withOptions = /**
     * Reset all options. Rebuild searching options if in searching mode.
     * @param {?} options
     * @return {?}
     */
    function (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.
     */
    /**
     * 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 {?}
     */
    NzCascaderService.prototype.setOptionActivated = /**
     * 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 {?}
     */
    function (option, columnIndex, select, loadingChildren) {
        if (select === void 0) { select = false; }
        if (loadingChildren === void 0) { loadingChildren = true; }
        if (option.disabled) {
            return;
        }
        this.activatedOptions[columnIndex] = option;
        this.trackAncestorActivatedOptions(columnIndex);
        this.dropBehindActivatedOptions(columnIndex);
        /** @type {?} */
        var 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.$redraw.next();
    };
    /**
     * Set a searching option as activated, finishing up things.
     * @param option
     */
    /**
     * Set a searching option as activated, finishing up things.
     * @param {?} option
     * @return {?}
     */
    NzCascaderService.prototype.setSearchOptionSelected = /**
     * Set a searching option as activated, finishing up things.
     * @param {?} option
     * @return {?}
     */
    function (option) {
        var _this = this;
        this.activatedOptions = [option];
        this.selectedOptions = tslib_1.__spread(option.path);
        this.prepareEmitValue();
        this.$redraw.next();
        this.$optionSelected.next({ option: option, index: 0 });
        setTimeout((/**
         * @return {?}
         */
        function () {
            // Reset data and tell UI only to remove input and reset dropdown width style.
            _this.$quitSearching.next();
            _this.$redraw.next();
            _this.inSearchingMode = false;
            _this.columns = tslib_1.__spread(_this.columnsSnapshot);
            _this.activatedOptions = tslib_1.__spread(_this.selectedOptions);
        }), 200);
    };
    /**
     * Filter cascader options to reset `columns`.
     * @param searchValue The string user wants to search.
     */
    /**
     * Filter cascader options to reset `columns`.
     * @param {?} searchValue The string user wants to search.
     * @return {?}
     */
    NzCascaderService.prototype.prepareSearchOptions = /**
     * Filter cascader options to reset `columns`.
     * @param {?} searchValue The string user wants to search.
     * @return {?}
     */
    function (searchValue) {
        var _this = this;
        /** @type {?} */
        var results = [];
        // Search results only have one layer.
        /** @type {?} */
        var path = [];
        /** @type {?} */
        var defaultFilter = (/**
         * @param {?} i
         * @param {?} p
         * @return {?}
         */
        function (i, p) {
            return p.some((/**
             * @param {?} o
             * @return {?}
             */
            function (o) {
                /** @type {?} */
                var label = _this.getOptionLabel(o);
                return !!label && label.indexOf(i) !== -1;
            }));
        });
        /** @type {?} */
        var showSearch = this.cascaderComponent.nzShowSearch;
        /** @type {?} */
        var filter = isShowSearchObject(showSearch) && showSearch.filter ? showSearch.filter : defaultFilter;
        /** @type {?} */
        var sorter = isShowSearchObject(showSearch) && showSearch.sorter ? showSearch.sorter : null;
        /** @type {?} */
        var loopChild = (/**
         * @param {?} node
         * @param {?=} forceDisabled
         * @return {?}
         */
        function (node, forceDisabled) {
            if (forceDisabled === void 0) { forceDisabled = false; }
            var _a;
            path.push(node);
            /** @type {?} */
            var cPath = Array.from(path);
            if (filter(searchValue, cPath)) {
                /** @type {?} */
                var disabled = forceDisabled || node.disabled;
                /** @type {?} */
                var option = (_a = {
                        disabled: disabled,
                        isLeaf: true,
                        path: cPath
                    },
                    _a[_this.cascaderComponent.nzLabelProperty] = cPath.map((/**
                     * @param {?} p
                     * @return {?}
                     */
                    function (p) { return _this.getOptionLabel(p); })).join(' / '),
                    _a);
                results.push(option);
            }
            path.pop();
        });
        /** @type {?} */
        var loopParent = (/**
         * @param {?} node
         * @param {?=} forceDisabled
         * @return {?}
         */
        function (node, forceDisabled) {
            if (forceDisabled === void 0) { forceDisabled = false; }
            /** @type {?} */
            var disabled = forceDisabled || node.disabled;
            path.push(node);
            (/** @type {?} */ (node.children)).forEach((/**
             * @param {?} sNode
             * @return {?}
             */
            function (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 {?}
         */
        function (o) { return (isChildOption(o) ? loopChild(o) : loopParent(o)); }));
        if (sorter) {
            results.sort((/**
             * @param {?} a
             * @param {?} b
             * @return {?}
             */
            function (a, b) { return 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
     */
    /**
     * Toggle searching mode by UI. It deals with things not directly related to UI.
     * @param {?} toSearching If this cascader is entering searching mode
     * @return {?}
     */
    NzCascaderService.prototype.toggleSearchingMode = /**
     * Toggle searching mode by UI. It deals with things not directly related to UI.
     * @param {?} toSearching If this cascader is entering searching mode
     * @return {?}
     */
    function (toSearching) {
        this.inSearchingMode = toSearching;
        if (toSearching) {
            this.activatedOptionsSnapshot = tslib_1.__spread(this.activatedOptions);
            this.activatedOptions = [];
            this.selectedOptions = [];
            this.$redraw.next();
        }
        else {
            // User quit searching mode without selecting an option.
            this.activatedOptions = tslib_1.__spread(this.activatedOptionsSnapshot);
            this.selectedOptions = tslib_1.__spread(this.activatedOptions);
            this.columns = tslib_1.__spread(this.columnsSnapshot);
            this.syncOptions();
            this.$redraw.next();
        }
    };
    /**
     * @param {?} option
     * @param {?} index
     * @return {?}
     */
    NzCascaderService.prototype.setOptionSelected = /**
     * @param {?} option
     * @param {?} index
     * @return {?}
     */
    function (option, index) {
        /** @type {?} */
        var changeOn = this.cascaderComponent.nzChangeOn;
        /** @type {?} */
        var shouldPerformSelection = (/**
         * @param {?} o
         * @param {?} i
         * @return {?}
         */
        function (o, i) {
            return typeof changeOn === 'function' ? changeOn(o, i) : false;
        });
        if (option.isLeaf || this.cascaderComponent.nzChangeOnSelect || shouldPerformSelection(option, index)) {
            this.selectedOptions = tslib_1.__spread(this.activatedOptions);
            this.prepareEmitValue();
            this.$redraw.next();
            this.$optionSelected.next({ option: option, index: index });
        }
    };
    /**
     * Clear selected options.
     */
    /**
     * Clear selected options.
     * @return {?}
     */
    NzCascaderService.prototype.clear = /**
     * Clear selected options.
     * @return {?}
     */
    function () {
        this.values = [];
        this.selectedOptions = [];
        this.activatedOptions = [];
        this.dropBehindColumns(0);
        this.prepareEmitValue();
        this.$redraw.next();
        this.$optionSelected.next(null);
    };
    /**
     * @param {?} o
     * @return {?}
     */
    NzCascaderService.prototype.getOptionLabel = /**
     * @param {?} o
     * @return {?}
     */
    function (o) {
        return (/** @type {?} */ (o[this.cascaderComponent.nzLabelProperty || 'label']));
    };
    // tslint:disable-next-line:no-any
    // tslint:disable-next-line:no-any
    /**
     * @param {?} o
     * @return {?}
     */
    NzCascaderService.prototype.getOptionValue = 
    // tslint:disable-next-line:no-any
    /**
     * @param {?} o
     * @return {?}
     */
    function (o) {
        return o[this.cascaderComponent.nzValueProperty || 'value'];
    };
    /**
     * Try to insert options into a column.
     * @param options Options to insert
     * @param columnIndex Position
     */
    /**
     * Try to insert options into a column.
     * @private
     * @param {?} options Options to insert
     * @param {?} columnIndex Position
     * @param {?} parent
     * @return {?}
     */
    NzCascaderService.prototype.setColumnData = /**
     * Try to insert options into a column.
     * @private
     * @param {?} options Options to insert
     * @param {?} columnIndex Position
     * @param {?} parent
     * @return {?}
     */
    function (options, columnIndex, parent) {
        /** @type {?} */
        var existingOptions = this.columns[columnIndex];
        if (!arraysEqual(existingOptions, options)) {
            options.forEach((/**
             * @param {?} o
             * @return {?}
             */
            function (o) { return (o.parent = parent); }));
            this.columns[columnIndex] = options;
            this.dropBehindColumns(columnIndex);
        }
    };
    /**
     * Set all ancestor options as activated.
     */
    /**
     * Set all ancestor options as activated.
     * @private
     * @param {?} startIndex
     * @return {?}
     */
    NzCascaderService.prototype.trackAncestorActivatedOptions = /**
     * Set all ancestor options as activated.
     * @private
     * @param {?} startIndex
     * @return {?}
     */
    function (startIndex) {
        for (var i = startIndex - 1; i >= 0; i--) {
            if (!this.activatedOptions[i]) {
                this.activatedOptions[i] = (/** @type {?} */ (this.activatedOptions[i + 1].parent));
            }
        }
    };
    /**
     * @private
     * @param {?} lastReserveIndex
     * @return {?}
     */
    NzCascaderService.prototype.dropBehindActivatedOptions = /**
     * @private
     * @param {?} lastReserveIndex
     * @return {?}
     */
    function (lastReserveIndex) {
        this.activatedOptions = this.activatedOptions.splice(0, lastReserveIndex + 1);
    };
    /**
     * @private
     * @param {?} lastReserveIndex
     * @return {?}
     */
    NzCascaderService.prototype.dropBehindColumns = /**
     * @private
     * @param {?} lastReserveIndex
     * @return {?}
     */
    function (lastReserveIndex) {
        if (lastReserveIndex < this.columns.length - 1) {
            this.columns = this.columns.slice(0, lastReserveIndex + 1);
        }
    };
    /**
     * Load children of an option asynchronously.
     */
    /**
     * Load children of an option asynchronously.
     * @param {?} option
     * @param {?} columnIndex
     * @param {?=} success
     * @param {?=} failure
     * @return {?}
     */
    NzCascaderService.prototype.loadChildren = /**
     * Load children of an option asynchronously.
     * @param {?} option
     * @param {?} columnIndex
     * @param {?=} success
     * @param {?=} failure
     * @return {?}
     */
    function (option, // tslint:disable-line:no-any
    columnIndex, success, failure) {
        var _this = this;
        /** @type {?} */
        var 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 {?}
             */
            function () {
                option.loading = false;
                if (option.children) {
                    _this.setColumnData(option.children, columnIndex + 1, option);
                }
                if (success) {
                    success();
                }
                _this.$loading.next(false);
                _this.$redraw.next();
            }), (/**
             * @return {?}
             */
            function () {
                option.loading = false;
                option.isLeaf = true;
                if (failure) {
                    failure();
                }
                _this.$redraw.next();
            }));
        }
    };
    /**
     * @private
     * @param {?} index
     * @return {?}
     */
    NzCascaderService.prototype.isLoaded = /**
     * @private
     * @param {?} index
     * @return {?}
     */
    function (index) {
        return this.columns[index] && this.columns[index].length > 0;
    };
    /**
     * Find a option that has a given value in a given column.
     */
    /**
     * Find a option that has a given value in a given column.
     * @private
     * @param {?} columnIndex
     * @param {?} value
     * @return {?}
     */
    NzCascaderService.prototype.findOptionWithValue = /**
     * Find a option that has a given value in a given column.
     * @private
     * @param {?} columnIndex
     * @param {?} value
     * @return {?}
     */
    function (columnIndex, value // tslint:disable-line:no-any
    ) {
        var _this = this;
        /** @type {?} */
        var targetColumn = this.columns[columnIndex];
        if (targetColumn) {
            /** @type {?} */
            var v_1 = typeof value === 'object' ? this.getOptionValue(value) : value;
            return (/** @type {?} */ (targetColumn.find((/**
             * @param {?} o
             * @return {?}
             */
            function (o) { return v_1 === _this.getOptionValue(o); }))));
        }
        return null;
    };
    /**
     * @private
     * @return {?}
     */
    NzCascaderService.prototype.prepareEmitValue = /**
     * @private
     * @return {?}
     */
    function () {
        var _this = this;
        this.values = this.selectedOptions.map((/**
         * @param {?} o
         * @return {?}
         */
        function (o) { return _this.getOptionValue(o); }));
    };
    NzCascaderService.decorators = [
        { type: Injectable }
    ];
    return NzCascaderService;
}());
export { NzCascaderService };
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.$quitSearching;
    /**
     * To hold columns before entering searching mode.
     * @type {?}
     * @private
     */
    NzCascaderService.prototype.columnsSnapshot;
    /**
     * To hold activated options before entering searching mode.
     * @type {?}
     * @private
     */
    NzCascaderService.prototype.activatedOptionsSnapshot;
    /**
     * @type {?}
     * @private
     */
    NzCascaderService.prototype.cascaderComponent;
}
//# 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* @license\n * Copyright Alibaba.com All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://github.com/NG-ZORRO/ng-zorro-antd/blob/master/LICENSE\n */\n\nimport { Injectable, OnDestroy } from '@angular/core';\nimport { BehaviorSubject, Subject } from 'rxjs';\n\nimport { arraysEqual } from 'ng-zorro-antd/core';\n\nimport {\n  isShowSearchObject,\n  CascaderOption,\n  CascaderSearchOption,\n  NzCascaderComponentAsSource,\n  NzCascaderFilter\n} from './nz-cascader-definitions';\nimport { isChildOption, isParentOption } from './nz-cascader-utils';\n\n/**\n * All data is stored and parsed in NzCascaderService.\n */\n@Injectable()\nexport class NzCascaderService implements OnDestroy {\n  /** Activated options in each column. */\n  activatedOptions: CascaderOption[] = [];\n\n  /** An array to store cascader items arranged in different layers. */\n  columns: CascaderOption[][] = [[]];\n\n  /** If user has 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options before entering searching mode. */\n  private activatedOptionsSnapshot: CascaderOption[] = [];\n\n  private cascaderComponent: NzCascaderComponentAsSource;\n\n  /** Return cascader options in the first layer. */\n  get nzOptions(): CascaderOption[] {\n    return this.columns[0];\n  }\n\n  ngOnDestroy(): void {\n    this.$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  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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"]}