source: trip-planner-front/node_modules/@angular/cdk/fesm2015/tree.js@ ceaed42

import { SelectionModel, isDataSource } from '@angular/cdk/collections';
import { isObservable, Subject, BehaviorSubject, of } from 'rxjs';
import { take, filter, takeUntil } from 'rxjs/operators';
import { InjectionToken, Directive, ViewContainerRef, Inject, Optional, TemplateRef, Component, ViewEncapsulation, ChangeDetectionStrategy, IterableDiffers, ChangeDetectorRef, Input, ViewChild, ContentChildren, ElementRef, HostListener, NgModule } from '@angular/core';
import { coerceNumberProperty, coerceBooleanProperty } from '@angular/cdk/coercion';
import { Directionality } from '@angular/cdk/bidi';

/**
 * @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
 */
/** Base tree control. It has basic toggle/expand/collapse operations on a single data node. */
class BaseTreeControl {
    constructor() {
        /** A selection model with multi-selection to track expansion status. */
        this.expansionModel = new SelectionModel(true);
    }
    /** Toggles one single data node's expanded/collapsed state. */
    toggle(dataNode) {
        this.expansionModel.toggle(this._trackByValue(dataNode));
    }
    /** Expands one single data node. */
    expand(dataNode) {
        this.expansionModel.select(this._trackByValue(dataNode));
    }
    /** Collapses one single data node. */
    collapse(dataNode) {
        this.expansionModel.deselect(this._trackByValue(dataNode));
    }
    /** Whether a given data node is expanded or not. Returns true if the data node is expanded. */
    isExpanded(dataNode) {
        return this.expansionModel.isSelected(this._trackByValue(dataNode));
    }
    /** Toggles a subtree rooted at `node` recursively. */
    toggleDescendants(dataNode) {
        this.expansionModel.isSelected(this._trackByValue(dataNode)) ?
            this.collapseDescendants(dataNode) :
            this.expandDescendants(dataNode);
    }
    /** Collapse all dataNodes in the tree. */
    collapseAll() {
        this.expansionModel.clear();
    }
    /** Expands a subtree rooted at given data node recursively. */
    expandDescendants(dataNode) {
        let toBeProcessed = [dataNode];
        toBeProcessed.push(...this.getDescendants(dataNode));
        this.expansionModel.select(...toBeProcessed.map(value => this._trackByValue(value)));
    }
    /** Collapses a subtree rooted at given data node recursively. */
    collapseDescendants(dataNode) {
        let toBeProcessed = [dataNode];
        toBeProcessed.push(...this.getDescendants(dataNode));
        this.expansionModel.deselect(...toBeProcessed.map(value => this._trackByValue(value)));
    }
    _trackByValue(value) {
        return this.trackBy ? this.trackBy(value) : value;
    }
}

/**
 * @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
 */
/** Flat tree control. Able to expand/collapse a subtree recursively for flattened tree. */
class FlatTreeControl extends BaseTreeControl {
    /** Construct with flat tree data node functions getLevel and isExpandable. */
    constructor(getLevel, isExpandable, options) {
        super();
        this.getLevel = getLevel;
        this.isExpandable = isExpandable;
        this.options = options;
        if (this.options) {
            this.trackBy = this.options.trackBy;
        }
    }
    /**
     * Gets a list of the data node's subtree of descendent data nodes.
     *
     * To make this working, the `dataNodes` of the TreeControl must be flattened tree nodes
     * with correct levels.
     */
    getDescendants(dataNode) {
        const startIndex = this.dataNodes.indexOf(dataNode);
        const results = [];
        // Goes through flattened tree nodes in the `dataNodes` array, and get all descendants.
        // The level of descendants of a tree node must be greater than the level of the given
        // tree node.
        // If we reach a node whose level is equal to the level of the tree node, we hit a sibling.
        // If we reach a node whose level is greater than the level of the tree node, we hit a
        // sibling of an ancestor.
        for (let i = startIndex + 1; i < this.dataNodes.length && this.getLevel(dataNode) < this.getLevel(this.dataNodes[i]); i++) {
            results.push(this.dataNodes[i]);
        }
        return results;
    }
    /**
     * Expands all data nodes in the tree.
     *
     * To make this working, the `dataNodes` variable of the TreeControl must be set to all flattened
     * data nodes of the tree.
     */
    expandAll() {
        this.expansionModel.select(...this.dataNodes.map(node => this._trackByValue(node)));
    }
}

/**
 * @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
 */
/** Nested tree control. Able to expand/collapse a subtree recursively for NestedNode type. */
class NestedTreeControl extends BaseTreeControl {
    /** Construct with nested tree function getChildren. */
    constructor(getChildren, options) {
        super();
        this.getChildren = getChildren;
        this.options = options;
        if (this.options) {
            this.trackBy = this.options.trackBy;
        }
    }
    /**
     * Expands all dataNodes in the tree.
     *
     * To make this working, the `dataNodes` variable of the TreeControl must be set to all root level
     * data nodes of the tree.
     */
    expandAll() {
        this.expansionModel.clear();
        const allNodes = this.dataNodes.reduce((accumulator, dataNode) => [...accumulator, ...this.getDescendants(dataNode), dataNode], []);
        this.expansionModel.select(...allNodes.map(node => this._trackByValue(node)));
    }
    /** Gets a list of descendant dataNodes of a subtree rooted at given data node recursively. */
    getDescendants(dataNode) {
        const descendants = [];
        this._getDescendants(descendants, dataNode);
        // Remove the node itself
        return descendants.splice(1);
    }
    /** A helper function to get descendants recursively. */
    _getDescendants(descendants, dataNode) {
        descendants.push(dataNode);
        const childrenNodes = this.getChildren(dataNode);
        if (Array.isArray(childrenNodes)) {
            childrenNodes.forEach((child) => this._getDescendants(descendants, child));
        }
        else if (isObservable(childrenNodes)) {
            // TypeScript as of version 3.5 doesn't seem to treat `Boolean` like a function that
            // returns a `boolean` specifically in the context of `filter`, so we manually clarify that.
            childrenNodes.pipe(take(1), filter(Boolean))
                .subscribe(children => {
                for (const child of children) {
                    this._getDescendants(descendants, child);
                }
            });
        }
    }
}

/**
 * @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
 */
/**
 * Injection token used to provide a `CdkTreeNode` to its outlet.
 * Used primarily to avoid circular imports.
 * @docs-private
 */
const CDK_TREE_NODE_OUTLET_NODE = new InjectionToken('CDK_TREE_NODE_OUTLET_NODE');
/**
 * Outlet for nested CdkNode. Put `[cdkTreeNodeOutlet]` on a tag to place children dataNodes
 * inside the outlet.
 */
class CdkTreeNodeOutlet {
    constructor(viewContainer, _node) {
        this.viewContainer = viewContainer;
        this._node = _node;
    }
}
CdkTreeNodeOutlet.decorators = [
    { type: Directive, args: [{
                selector: '[cdkTreeNodeOutlet]'
            },] }
];
CdkTreeNodeOutlet.ctorParameters = () => [
    { type: ViewContainerRef },
    { type: undefined, decorators: [{ type: Inject, args: [CDK_TREE_NODE_OUTLET_NODE,] }, { type: Optional }] }
];

/**
 * @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
 */
/** Context provided to the tree node component. */
class CdkTreeNodeOutletContext {
    constructor(data) {
        this.$implicit = data;
    }
}
/**
 * Data node definition for the CdkTree.
 * Captures the node's template and a when predicate that describes when this node should be used.
 */
class CdkTreeNodeDef {
    /** @docs-private */
    constructor(template) {
        this.template = template;
    }
}
CdkTreeNodeDef.decorators = [
    { type: Directive, args: [{
                selector: '[cdkTreeNodeDef]',
                inputs: [
                    'when: cdkTreeNodeDefWhen'
                ],
            },] }
];
CdkTreeNodeDef.ctorParameters = () => [
    { type: TemplateRef }
];

/**
 * @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
 */
/**
 * Returns an error to be thrown when there is no usable data.
 * @docs-private
 */
function getTreeNoValidDataSourceError() {
    return Error(`A valid data source must be provided.`);
}
/**
 * Returns an error to be thrown when there are multiple nodes that are missing a when function.
 * @docs-private
 */
function getTreeMultipleDefaultNodeDefsError() {
    return Error(`There can only be one default row without a when predicate function.`);
}
/**
 * Returns an error to be thrown when there are no matching node defs for a particular set of data.
 * @docs-private
 */
function getTreeMissingMatchingNodeDefError() {
    return Error(`Could not find a matching node definition for the provided node data.`);
}
/**
 * Returns an error to be thrown when there are tree control.
 * @docs-private
 */
function getTreeControlMissingError() {
    return Error(`Could not find a tree control for the tree.`);
}
/**
 * Returns an error to be thrown when tree control did not implement functions for flat/nested node.
 * @docs-private
 */
function getTreeControlFunctionsMissingError() {
    return Error(`Could not find functions for nested/flat tree in tree control.`);
}

/**
 * CDK tree component that connects with a data source to retrieve data of type `T` and renders
 * dataNodes with hierarchy. Updates the dataNodes when new data is provided by the data source.
 */
class CdkTree {
    constructor(_differs, _changeDetectorRef) {
        this._differs = _differs;
        this._changeDetectorRef = _changeDetectorRef;
        /** Subject that emits when the component has been destroyed. */
        this._onDestroy = new Subject();
        /** Level of nodes */
        this._levels = new Map();
        // TODO(tinayuangao): Setup a listener for scrolling, emit the calculated view to viewChange.
        //     Remove the MAX_VALUE in viewChange
        /**
         * Stream containing the latest information on what rows are being displayed on screen.
         * Can be used by the data source to as a heuristic of what data should be provided.
         */
        this.viewChange = new BehaviorSubject({ start: 0, end: Number.MAX_VALUE });
    }
    /**
     * Provides a stream containing the latest data array to render. Influenced by the tree's
     * stream of view window (what dataNodes are currently on screen).
     * Data source can be an observable of data array, or a data array to render.
     */
    get dataSource() { return this._dataSource; }
    set dataSource(dataSource) {
        if (this._dataSource !== dataSource) {
            this._switchDataSource(dataSource);
        }
    }
    ngOnInit() {
        this._dataDiffer = this._differs.find([]).create(this.trackBy);
        if (!this.treeControl && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw getTreeControlMissingError();
        }
    }
    ngOnDestroy() {
        this._nodeOutlet.viewContainer.clear();
        this.viewChange.complete();
        this._onDestroy.next();
        this._onDestroy.complete();
        if (this._dataSource && typeof this._dataSource.disconnect === 'function') {
            this.dataSource.disconnect(this);
        }
        if (this._dataSubscription) {
            this._dataSubscription.unsubscribe();
            this._dataSubscription = null;
        }
    }
    ngAfterContentChecked() {
        const defaultNodeDefs = this._nodeDefs.filter(def => !def.when);
        if (defaultNodeDefs.length > 1 && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw getTreeMultipleDefaultNodeDefsError();
        }
        this._defaultNodeDef = defaultNodeDefs[0];
        if (this.dataSource && this._nodeDefs && !this._dataSubscription) {
            this._observeRenderChanges();
        }
    }
    // TODO(tinayuangao): Work on keyboard traversal and actions, make sure it's working for RTL
    //     and nested trees.
    /**
     * Switch to the provided data source by resetting the data and unsubscribing from the current
     * render change subscription if one exists. If the data source is null, interpret this by
     * clearing the node outlet. Otherwise start listening for new data.
     */
    _switchDataSource(dataSource) {
        if (this._dataSource && typeof this._dataSource.disconnect === 'function') {
            this.dataSource.disconnect(this);
        }
        if (this._dataSubscription) {
            this._dataSubscription.unsubscribe();
            this._dataSubscription = null;
        }
        // Remove the all dataNodes if there is now no data source
        if (!dataSource) {
            this._nodeOutlet.viewContainer.clear();
        }
        this._dataSource = dataSource;
        if (this._nodeDefs) {
            this._observeRenderChanges();
        }
    }
    /** Set up a subscription for the data provided by the data source. */
    _observeRenderChanges() {
        let dataStream;
        if (isDataSource(this._dataSource)) {
            dataStream = this._dataSource.connect(this);
        }
        else if (isObservable(this._dataSource)) {
            dataStream = this._dataSource;
        }
        else if (Array.isArray(this._dataSource)) {
            dataStream = of(this._dataSource);
        }
        if (dataStream) {
            this._dataSubscription = dataStream.pipe(takeUntil(this._onDestroy))
                .subscribe(data => this.renderNodeChanges(data));
        }
        else if (typeof ngDevMode === 'undefined' || ngDevMode) {
            throw getTreeNoValidDataSourceError();
        }
    }
    /** Check for changes made in the data and render each change (node added/removed/moved). */
    renderNodeChanges(data, dataDiffer = this._dataDiffer, viewContainer = this._nodeOutlet.viewContainer, parentData) {
        const changes = dataDiffer.diff(data);
        if (!changes) {
            return;
        }
        changes.forEachOperation((item, adjustedPreviousIndex, currentIndex) => {
            if (item.previousIndex == null) {
                this.insertNode(data[currentIndex], currentIndex, viewContainer, parentData);
            }
            else if (currentIndex == null) {
                viewContainer.remove(adjustedPreviousIndex);
                this._levels.delete(item.item);
            }
            else {
                const view = viewContainer.get(adjustedPreviousIndex);
                viewContainer.move(view, currentIndex);
            }
        });
        this._changeDetectorRef.detectChanges();
    }
    /**
     * Finds the matching node definition that should be used for this node data. If there is only
     * one node definition, it is returned. Otherwise, find the node definition that has a when
     * predicate that returns true with the data. If none return true, return the default node
     * definition.
     */
    _getNodeDef(data, i) {
        if (this._nodeDefs.length === 1) {
            return this._nodeDefs.first;
        }
        const nodeDef = this._nodeDefs.find(def => def.when && def.when(i, data)) || this._defaultNodeDef;
        if (!nodeDef && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw getTreeMissingMatchingNodeDefError();
        }
        return nodeDef;
    }
    /**
     * Create the embedded view for the data node template and place it in the correct index location
     * within the data node view container.
     */
    insertNode(nodeData, index, viewContainer, parentData) {
        const node = this._getNodeDef(nodeData, index);
        // Node context that will be provided to created embedded view
        const context = new CdkTreeNodeOutletContext(nodeData);
        // If the tree is flat tree, then use the `getLevel` function in flat tree control
        // Otherwise, use the level of parent node.
        if (this.treeControl.getLevel) {
            context.level = this.treeControl.getLevel(nodeData);
        }
        else if (typeof parentData !== 'undefined' && this._levels.has(parentData)) {
            context.level = this._levels.get(parentData) + 1;
        }
        else {
            context.level = 0;
        }
        this._levels.set(nodeData, context.level);
        // Use default tree nodeOutlet, or nested node's nodeOutlet
        const container = viewContainer ? viewContainer : this._nodeOutlet.viewContainer;
        container.createEmbeddedView(node.template, context, index);
        // Set the data to just created `CdkTreeNode`.
        // The `CdkTreeNode` created from `createEmbeddedView` will be saved in static variable
        //     `mostRecentTreeNode`. We get it from static variable and pass the node data to it.
        if (CdkTreeNode.mostRecentTreeNode) {
            CdkTreeNode.mostRecentTreeNode.data = nodeData;
        }
    }
}
CdkTree.decorators = [
    { type: Component, args: [{
                selector: 'cdk-tree',
                exportAs: 'cdkTree',
                template: `<ng-container cdkTreeNodeOutlet></ng-container>`,
                host: {
                    'class': 'cdk-tree',
                    'role': 'tree',
                },
                encapsulation: ViewEncapsulation.None,
                // The "OnPush" status for the `CdkTree` component is effectively a noop, so we are removing it.
                // The view for `CdkTree` consists entirely of templates declared in other views. As they are
                // declared elsewhere, they are checked when their declaration points are checked.
                // tslint:disable-next-line:validate-decorators
                changeDetection: ChangeDetectionStrategy.Default
            },] }
];
CdkTree.ctorParameters = () => [
    { type: IterableDiffers },
    { type: ChangeDetectorRef }
];
CdkTree.propDecorators = {
    dataSource: [{ type: Input }],
    treeControl: [{ type: Input }],
    trackBy: [{ type: Input }],
    _nodeOutlet: [{ type: ViewChild, args: [CdkTreeNodeOutlet, { static: true },] }],
    _nodeDefs: [{ type: ContentChildren, args: [CdkTreeNodeDef, {
                    // We need to use `descendants: true`, because Ivy will no longer match
                    // indirect descendants if it's left as false.
                    descendants: true
                },] }]
};
/**
 * Tree node for CdkTree. It contains the data in the tree node.
 */
class CdkTreeNode {
    constructor(_elementRef, _tree) {
        this._elementRef = _elementRef;
        this._tree = _tree;
        /** Subject that emits when the component has been destroyed. */
        this._destroyed = new Subject();
        /** Emits when the node's data has changed. */
        this._dataChanges = new Subject();
        CdkTreeNode.mostRecentTreeNode = this;
        // The classes are directly added here instead of in the host property because classes on
        // the host property are not inherited with View Engine. It is not set as a @HostBinding because
        // it is not set by the time it's children nodes try to read the class from it.
        // TODO: move to host after View Engine deprecation
        this._elementRef.nativeElement.classList.add('cdk-tree-node');
        this.role = 'treeitem';
    }
    /**
     * The role of the tree node.
     * @deprecated The correct role is 'treeitem', 'group' should not be used. This input will be
     *   removed in a future version.
     * @breaking-change 12.0.0 Remove this input
     */
    get role() { return 'treeitem'; }
    set role(_role) {
        // TODO: move to host after View Engine deprecation
        this._elementRef.nativeElement.setAttribute('role', _role);
    }
    /** The tree node's data. */
    get data() { return this._data; }
    set data(value) {
        if (value !== this._data) {
            this._data = value;
            this._setRoleFromData();
            this._dataChanges.next();
        }
    }
    get isExpanded() {
        return this._tree.treeControl.isExpanded(this._data);
    }
    _setExpanded(_expanded) {
        this._isAriaExpanded = _expanded;
        this._elementRef.nativeElement.setAttribute('aria-expanded', `${_expanded}`);
    }
    get level() {
        // If the treeControl has a getLevel method, use it to get the level. Otherwise read the
        // aria-level off the parent node and use it as the level for this node (note aria-level is
        // 1-indexed, while this property is 0-indexed, so we don't need to increment).
        return this._tree.treeControl.getLevel ?
            this._tree.treeControl.getLevel(this._data) : this._parentNodeAriaLevel;
    }
    ngOnInit() {
        this._parentNodeAriaLevel = getParentNodeAriaLevel(this._elementRef.nativeElement);
        this._elementRef.nativeElement.setAttribute('aria-level', `${this.level + 1}`);
    }
    ngDoCheck() {
        // aria-expanded is be set here because the expanded state is stored in the tree control and
        // the node isn't aware when the state is changed.
        // It is not set using a @HostBinding because they sometimes get lost with Mixin based classes.
        // TODO: move to host after View Engine deprecation
        if (this.isExpanded != this._isAriaExpanded) {
            this._setExpanded(this.isExpanded);
        }
    }
    ngOnDestroy() {
        // If this is the last tree node being destroyed,
        // clear out the reference to avoid leaking memory.
        if (CdkTreeNode.mostRecentTreeNode === this) {
            CdkTreeNode.mostRecentTreeNode = null;
        }
        this._dataChanges.complete();
        this._destroyed.next();
        this._destroyed.complete();
    }
    /** Focuses the menu item. Implements for FocusableOption. */
    focus() {
        this._elementRef.nativeElement.focus();
    }
    // TODO: role should eventually just be set in the component host
    _setRoleFromData() {
        if (!this._tree.treeControl.isExpandable && !this._tree.treeControl.getChildren &&
            (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw getTreeControlFunctionsMissingError();
        }
        this.role = 'treeitem';
    }
}
/**
 * The most recently created `CdkTreeNode`. We save it in static variable so we can retrieve it
 * in `CdkTree` and set the data to it.
 */
CdkTreeNode.mostRecentTreeNode = null;
CdkTreeNode.decorators = [
    { type: Directive, args: [{
                selector: 'cdk-tree-node',
                exportAs: 'cdkTreeNode',
            },] }
];
CdkTreeNode.ctorParameters = () => [
    { type: ElementRef },
    { type: CdkTree }
];
CdkTreeNode.propDecorators = {
    role: [{ type: Input }]
};
function getParentNodeAriaLevel(nodeElement) {
    let parent = nodeElement.parentElement;
    while (parent && !isNodeElement(parent)) {
        parent = parent.parentElement;
    }
    if (!parent) {
        if (typeof ngDevMode === 'undefined' || ngDevMode) {
            throw Error('Incorrect tree structure containing detached node.');
        }
        else {
            return -1;
        }
    }
    else if (parent.classList.contains('cdk-nested-tree-node')) {
        return coerceNumberProperty(parent.getAttribute('aria-level'));
    }
    else {
        // The ancestor element is the cdk-tree itself
        return 0;
    }
}
function isNodeElement(element) {
    const classList = element.classList;
    return !!((classList === null || classList === void 0 ? void 0 : classList.contains('cdk-nested-tree-node')) || (classList === null || classList === void 0 ? void 0 : classList.contains('cdk-tree')));
}

/**
 * @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
 */
/**
 * Nested node is a child of `<cdk-tree>`. It works with nested tree.
 * By using `cdk-nested-tree-node` component in tree node template, children of the parent node will
 * be added in the `cdkTreeNodeOutlet` in tree node template.
 * The children of node will be automatically added to `cdkTreeNodeOutlet`.
 */
class CdkNestedTreeNode extends CdkTreeNode {
    constructor(elementRef, tree, _differs) {
        super(elementRef, tree);
        this._differs = _differs;
        // The classes are directly added here instead of in the host property because classes on
        // the host property are not inherited with View Engine. It is not set as a @HostBinding because
        // it is not set by the time it's children nodes try to read the class from it.
        // TODO: move to host after View Engine deprecation
        elementRef.nativeElement.classList.add('cdk-nested-tree-node');
    }
    ngAfterContentInit() {
        this._dataDiffer = this._differs.find([]).create(this._tree.trackBy);
        if (!this._tree.treeControl.getChildren && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            throw getTreeControlFunctionsMissingError();
        }
        const childrenNodes = this._tree.treeControl.getChildren(this.data);
        if (Array.isArray(childrenNodes)) {
            this.updateChildrenNodes(childrenNodes);
        }
        else if (isObservable(childrenNodes)) {
            childrenNodes.pipe(takeUntil(this._destroyed))
                .subscribe(result => this.updateChildrenNodes(result));
        }
        this.nodeOutlet.changes.pipe(takeUntil(this._destroyed))
            .subscribe(() => this.updateChildrenNodes());
    }
    // This is a workaround for https://github.com/angular/angular/issues/23091
    // In aot mode, the lifecycle hooks from parent class are not called.
    ngOnInit() {
        super.ngOnInit();
    }
    ngDoCheck() {
        super.ngDoCheck();
    }
    ngOnDestroy() {
        this._clear();
        super.ngOnDestroy();
    }
    /** Add children dataNodes to the NodeOutlet */
    updateChildrenNodes(children) {
        const outlet = this._getNodeOutlet();
        if (children) {
            this._children = children;
        }
        if (outlet && this._children) {
            const viewContainer = outlet.viewContainer;
            this._tree.renderNodeChanges(this._children, this._dataDiffer, viewContainer, this._data);
        }
        else {
            // Reset the data differ if there's no children nodes displayed
            this._dataDiffer.diff([]);
        }
    }
    /** Clear the children dataNodes. */
    _clear() {
        const outlet = this._getNodeOutlet();
        if (outlet) {
            outlet.viewContainer.clear();
            this._dataDiffer.diff([]);
        }
    }
    /** Gets the outlet for the current node. */
    _getNodeOutlet() {
        const outlets = this.nodeOutlet;
        // Note that since we use `descendants: true` on the query, we have to ensure
        // that we don't pick up the outlet of a child node by accident.
        return outlets && outlets.find(outlet => !outlet._node || outlet._node === this);
    }
}
CdkNestedTreeNode.decorators = [
    { type: Directive, args: [{
                selector: 'cdk-nested-tree-node',
                exportAs: 'cdkNestedTreeNode',
                inputs: ['role', 'disabled', 'tabIndex'],
                providers: [
                    { provide: CdkTreeNode, useExisting: CdkNestedTreeNode },
                    { provide: CDK_TREE_NODE_OUTLET_NODE, useExisting: CdkNestedTreeNode }
                ]
            },] }
];
CdkNestedTreeNode.ctorParameters = () => [
    { type: ElementRef },
    { type: CdkTree },
    { type: IterableDiffers }
];
CdkNestedTreeNode.propDecorators = {
    nodeOutlet: [{ type: ContentChildren, args: [CdkTreeNodeOutlet, {
                    // We need to use `descendants: true`, because Ivy will no longer match
                    // indirect descendants if it's left as false.
                    descendants: true
                },] }]
};

/**
 * @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
 */
/** Regex used to split a string on its CSS units. */
const cssUnitPattern = /([A-Za-z%]+)$/;
/**
 * Indent for the children tree dataNodes.
 * This directive will add left-padding to the node to show hierarchy.
 */
class CdkTreeNodePadding {
    constructor(_treeNode, _tree, _element, _dir) {
        this._treeNode = _treeNode;
        this._tree = _tree;
        this._element = _element;
        this._dir = _dir;
        /** Subject that emits when the component has been destroyed. */
        this._destroyed = new Subject();
        /** CSS units used for the indentation value. */
        this.indentUnits = 'px';
        this._indent = 40;
        this._setPadding();
        if (_dir) {
            _dir.change.pipe(takeUntil(this._destroyed)).subscribe(() => this._setPadding(true));
        }
        // In Ivy the indentation binding might be set before the tree node's data has been added,
        // which means that we'll miss the first render. We have to subscribe to changes in the
        // data to ensure that everything is up to date.
        _treeNode._dataChanges.subscribe(() => this._setPadding());
    }
    /** The level of depth of the tree node. The padding will be `level * indent` pixels. */
    get level() { return this._level; }
    set level(value) { this._setLevelInput(value); }
    /**
     * The indent for each level. Can be a number or a CSS string.
     * Default number 40px from material design menu sub-menu spec.
     */
    get indent() { return this._indent; }
    set indent(indent) { this._setIndentInput(indent); }
    ngOnDestroy() {
        this._destroyed.next();
        this._destroyed.complete();
    }
    /** The padding indent value for the tree node. Returns a string with px numbers if not null. */
    _paddingIndent() {
        const nodeLevel = (this._treeNode.data && this._tree.treeControl.getLevel)
            ? this._tree.treeControl.getLevel(this._treeNode.data)
            : null;
        const level = this._level == null ? nodeLevel : this._level;
        return typeof level === 'number' ? `${level * this._indent}${this.indentUnits}` : null;
    }
    _setPadding(forceChange = false) {
        const padding = this._paddingIndent();
        if (padding !== this._currentPadding || forceChange) {
            const element = this._element.nativeElement;
            const paddingProp = this._dir && this._dir.value === 'rtl' ? 'paddingRight' : 'paddingLeft';
            const resetProp = paddingProp === 'paddingLeft' ? 'paddingRight' : 'paddingLeft';
            element.style[paddingProp] = padding || '';
            element.style[resetProp] = '';
            this._currentPadding = padding;
        }
    }
    /**
     * This has been extracted to a util because of TS 4 and VE.
     * View Engine doesn't support property rename inheritance.
     * TS 4.0 doesn't allow properties to override accessors or vice-versa.
     * @docs-private
     */
    _setLevelInput(value) {
        // Set to null as the fallback value so that _setPadding can fall back to the node level if the
        // consumer set the directive as `cdkTreeNodePadding=""`. We still want to take this value if
        // they set 0 explicitly.
        this._level = coerceNumberProperty(value, null);
        this._setPadding();
    }
    /**
     * This has been extracted to a util because of TS 4 and VE.
     * View Engine doesn't support property rename inheritance.
     * TS 4.0 doesn't allow properties to override accessors or vice-versa.
     * @docs-private
     */
    _setIndentInput(indent) {
        let value = indent;
        let units = 'px';
        if (typeof indent === 'string') {
            const parts = indent.split(cssUnitPattern);
            value = parts[0];
            units = parts[1] || units;
        }
        this.indentUnits = units;
        this._indent = coerceNumberProperty(value);
        this._setPadding();
    }
}
CdkTreeNodePadding.decorators = [
    { type: Directive, args: [{
                selector: '[cdkTreeNodePadding]',
            },] }
];
CdkTreeNodePadding.ctorParameters = () => [
    { type: CdkTreeNode },
    { type: CdkTree },
    { type: ElementRef },
    { type: Directionality, decorators: [{ type: Optional }] }
];
CdkTreeNodePadding.propDecorators = {
    level: [{ type: Input, args: ['cdkTreeNodePadding',] }],
    indent: [{ type: Input, args: ['cdkTreeNodePaddingIndent',] }]
};

/**
 * @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
 */
/**
 * Node toggle to expand/collapse the node.
 */
class CdkTreeNodeToggle {
    constructor(_tree, _treeNode) {
        this._tree = _tree;
        this._treeNode = _treeNode;
        this._recursive = false;
    }
    /** Whether expand/collapse the node recursively. */
    get recursive() { return this._recursive; }
    set recursive(value) { this._recursive = coerceBooleanProperty(value); }
    // We have to use a `HostListener` here in order to support both Ivy and ViewEngine.
    // In Ivy the `host` bindings will be merged when this class is extended, whereas in
    // ViewEngine they're overwritten.
    // TODO(crisbeto): we move this back into `host` once Ivy is turned on by default.
    // tslint:disable-next-line:no-host-decorator-in-concrete
    _toggle(event) {
        this.recursive
            ? this._tree.treeControl.toggleDescendants(this._treeNode.data)
            : this._tree.treeControl.toggle(this._treeNode.data);
        event.stopPropagation();
    }
}
CdkTreeNodeToggle.decorators = [
    { type: Directive, args: [{ selector: '[cdkTreeNodeToggle]' },] }
];
CdkTreeNodeToggle.ctorParameters = () => [
    { type: CdkTree },
    { type: CdkTreeNode }
];
CdkTreeNodeToggle.propDecorators = {
    recursive: [{ type: Input, args: ['cdkTreeNodeToggleRecursive',] }],
    _toggle: [{ type: HostListener, args: ['click', ['$event'],] }]
};

/**
 * @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
 */
const EXPORTED_DECLARATIONS = [
    CdkNestedTreeNode,
    CdkTreeNodeDef,
    CdkTreeNodePadding,
    CdkTreeNodeToggle,
    CdkTree,
    CdkTreeNode,
    CdkTreeNodeOutlet,
];
class CdkTreeModule {
}
CdkTreeModule.decorators = [
    { type: NgModule, args: [{
                exports: EXPORTED_DECLARATIONS,
                declarations: EXPORTED_DECLARATIONS,
            },] }
];

/**
 * @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
 */

/**
 * Generated bundle index. Do not edit.
 */

export { BaseTreeControl, CDK_TREE_NODE_OUTLET_NODE, CdkNestedTreeNode, CdkTree, CdkTreeModule, CdkTreeNode, CdkTreeNodeDef, CdkTreeNodeOutlet, CdkTreeNodeOutletContext, CdkTreeNodePadding, CdkTreeNodeToggle, FlatTreeControl, NestedTreeControl, getTreeControlFunctionsMissingError, getTreeControlMissingError, getTreeMissingMatchingNodeDefError, getTreeMultipleDefaultNodeDefsError, getTreeNoValidDataSourceError };
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