dropdown.js 54 KB

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  1. /**
  2. * @fileoverview added by tsickle
  3. * @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
  4. */
  5. import { ChangeDetectorRef, ContentChild, ContentChildren, Directive, ElementRef, EventEmitter, forwardRef, Inject, Input, NgZone, Output, QueryList, Renderer2, Optional } from '@angular/core';
  6. import { DOCUMENT } from '@angular/common';
  7. import { fromEvent, Subject } from 'rxjs';
  8. import { take } from 'rxjs/operators';
  9. import { positionElements } from '../util/positioning';
  10. import { ngbAutoClose } from '../util/autoclose';
  11. import { Key } from '../util/key';
  12. import { NgbDropdownConfig } from './dropdown-config';
  13. export class NgbNavbar {
  14. }
  15. NgbNavbar.decorators = [
  16. { type: Directive, args: [{ selector: '.navbar' },] }
  17. ];
  18. /**
  19. * A directive you should put on a dropdown item to enable keyboard navigation.
  20. * Arrow keys will move focus between items marked with this directive.
  21. *
  22. * \@since 4.1.0
  23. */
  24. export class NgbDropdownItem {
  25. /**
  26. * @param {?} elementRef
  27. */
  28. constructor(elementRef) {
  29. this.elementRef = elementRef;
  30. this._disabled = false;
  31. }
  32. /**
  33. * @param {?} value
  34. * @return {?}
  35. */
  36. set disabled(value) {
  37. this._disabled = (/** @type {?} */ (value)) === '' || value === true; // accept an empty attribute as true
  38. }
  39. /**
  40. * @return {?}
  41. */
  42. get disabled() { return this._disabled; }
  43. }
  44. NgbDropdownItem.decorators = [
  45. { type: Directive, args: [{ selector: '[ngbDropdownItem]', host: { 'class': 'dropdown-item', '[class.disabled]': 'disabled' } },] }
  46. ];
  47. /** @nocollapse */
  48. NgbDropdownItem.ctorParameters = () => [
  49. { type: ElementRef }
  50. ];
  51. NgbDropdownItem.propDecorators = {
  52. disabled: [{ type: Input }]
  53. };
  54. if (false) {
  55. /**
  56. * @type {?}
  57. * @private
  58. */
  59. NgbDropdownItem.prototype._disabled;
  60. /** @type {?} */
  61. NgbDropdownItem.prototype.elementRef;
  62. }
  63. /**
  64. * A directive that wraps dropdown menu content and dropdown items.
  65. */
  66. export class NgbDropdownMenu {
  67. /**
  68. * @param {?} dropdown
  69. */
  70. constructor(dropdown) {
  71. this.dropdown = dropdown;
  72. this.placement = 'bottom';
  73. this.isOpen = false;
  74. }
  75. }
  76. NgbDropdownMenu.decorators = [
  77. { type: Directive, args: [{
  78. selector: '[ngbDropdownMenu]',
  79. host: {
  80. '[class.dropdown-menu]': 'true',
  81. '[class.show]': 'dropdown.isOpen()',
  82. '[attr.x-placement]': 'placement',
  83. '(keydown.ArrowUp)': 'dropdown.onKeyDown($event)',
  84. '(keydown.ArrowDown)': 'dropdown.onKeyDown($event)',
  85. '(keydown.Home)': 'dropdown.onKeyDown($event)',
  86. '(keydown.End)': 'dropdown.onKeyDown($event)',
  87. '(keydown.Enter)': 'dropdown.onKeyDown($event)',
  88. '(keydown.Space)': 'dropdown.onKeyDown($event)'
  89. }
  90. },] }
  91. ];
  92. /** @nocollapse */
  93. NgbDropdownMenu.ctorParameters = () => [
  94. { type: undefined, decorators: [{ type: Inject, args: [forwardRef((/**
  95. * @return {?}
  96. */
  97. () => NgbDropdown)),] }] }
  98. ];
  99. NgbDropdownMenu.propDecorators = {
  100. menuItems: [{ type: ContentChildren, args: [NgbDropdownItem,] }]
  101. };
  102. if (false) {
  103. /** @type {?} */
  104. NgbDropdownMenu.prototype.placement;
  105. /** @type {?} */
  106. NgbDropdownMenu.prototype.isOpen;
  107. /** @type {?} */
  108. NgbDropdownMenu.prototype.menuItems;
  109. /** @type {?} */
  110. NgbDropdownMenu.prototype.dropdown;
  111. }
  112. /**
  113. * A directive to mark an element to which dropdown menu will be anchored.
  114. *
  115. * This is a simple version of the `NgbDropdownToggle` directive.
  116. * It plays the same role, but doesn't listen to click events to toggle dropdown menu thus enabling support
  117. * for events other than click.
  118. *
  119. * \@since 1.1.0
  120. */
  121. export class NgbDropdownAnchor {
  122. /**
  123. * @param {?} dropdown
  124. * @param {?} _elementRef
  125. */
  126. constructor(dropdown, _elementRef) {
  127. this.dropdown = dropdown;
  128. this._elementRef = _elementRef;
  129. this.anchorEl = _elementRef.nativeElement;
  130. }
  131. /**
  132. * @return {?}
  133. */
  134. getNativeElement() { return this._elementRef.nativeElement; }
  135. }
  136. NgbDropdownAnchor.decorators = [
  137. { type: Directive, args: [{
  138. selector: '[ngbDropdownAnchor]',
  139. host: { 'class': 'dropdown-toggle', 'aria-haspopup': 'true', '[attr.aria-expanded]': 'dropdown.isOpen()' }
  140. },] }
  141. ];
  142. /** @nocollapse */
  143. NgbDropdownAnchor.ctorParameters = () => [
  144. { type: undefined, decorators: [{ type: Inject, args: [forwardRef((/**
  145. * @return {?}
  146. */
  147. () => NgbDropdown)),] }] },
  148. { type: ElementRef }
  149. ];
  150. if (false) {
  151. /** @type {?} */
  152. NgbDropdownAnchor.prototype.anchorEl;
  153. /** @type {?} */
  154. NgbDropdownAnchor.prototype.dropdown;
  155. /**
  156. * @type {?}
  157. * @private
  158. */
  159. NgbDropdownAnchor.prototype._elementRef;
  160. }
  161. /**
  162. * A directive to mark an element that will toggle dropdown via the `click` event.
  163. *
  164. * You can also use `NgbDropdownAnchor` as an alternative.
  165. */
  166. export class NgbDropdownToggle extends NgbDropdownAnchor {
  167. /**
  168. * @param {?} dropdown
  169. * @param {?} elementRef
  170. */
  171. constructor(dropdown, elementRef) {
  172. super(dropdown, elementRef);
  173. }
  174. }
  175. NgbDropdownToggle.decorators = [
  176. { type: Directive, args: [{
  177. selector: '[ngbDropdownToggle]',
  178. host: {
  179. 'class': 'dropdown-toggle',
  180. 'aria-haspopup': 'true',
  181. '[attr.aria-expanded]': 'dropdown.isOpen()',
  182. '(click)': 'dropdown.toggle()',
  183. '(keydown.ArrowUp)': 'dropdown.onKeyDown($event)',
  184. '(keydown.ArrowDown)': 'dropdown.onKeyDown($event)',
  185. '(keydown.Home)': 'dropdown.onKeyDown($event)',
  186. '(keydown.End)': 'dropdown.onKeyDown($event)'
  187. },
  188. providers: [{ provide: NgbDropdownAnchor, useExisting: forwardRef((/**
  189. * @return {?}
  190. */
  191. () => NgbDropdownToggle)) }]
  192. },] }
  193. ];
  194. /** @nocollapse */
  195. NgbDropdownToggle.ctorParameters = () => [
  196. { type: undefined, decorators: [{ type: Inject, args: [forwardRef((/**
  197. * @return {?}
  198. */
  199. () => NgbDropdown)),] }] },
  200. { type: ElementRef }
  201. ];
  202. /**
  203. * A directive that provides contextual overlays for displaying lists of links and more.
  204. */
  205. export class NgbDropdown {
  206. /**
  207. * @param {?} _changeDetector
  208. * @param {?} config
  209. * @param {?} _document
  210. * @param {?} _ngZone
  211. * @param {?} _elementRef
  212. * @param {?} _renderer
  213. * @param {?} ngbNavbar
  214. */
  215. constructor(_changeDetector, config, _document, _ngZone, _elementRef, _renderer, ngbNavbar) {
  216. this._changeDetector = _changeDetector;
  217. this._document = _document;
  218. this._ngZone = _ngZone;
  219. this._elementRef = _elementRef;
  220. this._renderer = _renderer;
  221. this._closed$ = new Subject();
  222. /**
  223. * Defines whether or not the dropdown menu is opened initially.
  224. */
  225. this._open = false;
  226. /**
  227. * An event fired when the dropdown is opened or closed.
  228. *
  229. * The event payload is a `boolean`:
  230. * * `true` - the dropdown was opened
  231. * * `false` - the dropdown was closed
  232. */
  233. this.openChange = new EventEmitter();
  234. this.placement = config.placement;
  235. this.container = config.container;
  236. this.autoClose = config.autoClose;
  237. this.display = ngbNavbar ? 'static' : 'dynamic';
  238. this._zoneSubscription = _ngZone.onStable.subscribe((/**
  239. * @return {?}
  240. */
  241. () => { this._positionMenu(); }));
  242. }
  243. /**
  244. * @return {?}
  245. */
  246. ngAfterContentInit() {
  247. this._ngZone.onStable.pipe(take(1)).subscribe((/**
  248. * @return {?}
  249. */
  250. () => {
  251. this._applyPlacementClasses();
  252. if (this._open) {
  253. this._setCloseHandlers();
  254. }
  255. }));
  256. }
  257. /**
  258. * @param {?} changes
  259. * @return {?}
  260. */
  261. ngOnChanges(changes) {
  262. if (changes.container && this._open) {
  263. this._applyContainer(this.container);
  264. }
  265. if (changes.placement && !changes.placement.isFirstChange) {
  266. this._applyPlacementClasses();
  267. }
  268. }
  269. /**
  270. * Checks if the dropdown menu is open.
  271. * @return {?}
  272. */
  273. isOpen() { return this._open; }
  274. /**
  275. * Opens the dropdown menu.
  276. * @return {?}
  277. */
  278. open() {
  279. if (!this._open) {
  280. this._open = true;
  281. this._applyContainer(this.container);
  282. this.openChange.emit(true);
  283. this._setCloseHandlers();
  284. }
  285. }
  286. /**
  287. * @private
  288. * @return {?}
  289. */
  290. _setCloseHandlers() {
  291. /** @type {?} */
  292. const anchor = this._anchor;
  293. ngbAutoClose(this._ngZone, this._document, this.autoClose, (/**
  294. * @return {?}
  295. */
  296. () => this.close()), this._closed$, this._menu ? [this._menuElement.nativeElement] : [], anchor ? [anchor.getNativeElement()] : [], '.dropdown-item,.dropdown-divider');
  297. }
  298. /**
  299. * Closes the dropdown menu.
  300. * @return {?}
  301. */
  302. close() {
  303. if (this._open) {
  304. this._open = false;
  305. this._resetContainer();
  306. this._closed$.next();
  307. this.openChange.emit(false);
  308. this._changeDetector.markForCheck();
  309. }
  310. }
  311. /**
  312. * Toggles the dropdown menu.
  313. * @return {?}
  314. */
  315. toggle() {
  316. if (this.isOpen()) {
  317. this.close();
  318. }
  319. else {
  320. this.open();
  321. }
  322. }
  323. /**
  324. * @return {?}
  325. */
  326. ngOnDestroy() {
  327. this._resetContainer();
  328. this._closed$.next();
  329. this._zoneSubscription.unsubscribe();
  330. }
  331. /**
  332. * @param {?} event
  333. * @return {?}
  334. */
  335. onKeyDown(event) {
  336. // tslint:disable-next-line:deprecation
  337. /** @type {?} */
  338. const key = event.which;
  339. /** @type {?} */
  340. const itemElements = this._getMenuElements();
  341. /** @type {?} */
  342. let position = -1;
  343. /** @type {?} */
  344. let isEventFromItems = false;
  345. /** @type {?} */
  346. let itemElement = null;
  347. /** @type {?} */
  348. const isEventFromToggle = this._isEventFromToggle(event);
  349. if (!isEventFromToggle && itemElements.length) {
  350. itemElements.forEach((/**
  351. * @param {?} item
  352. * @param {?} index
  353. * @return {?}
  354. */
  355. (item, index) => {
  356. if (item.contains((/** @type {?} */ (event.target)))) {
  357. isEventFromItems = true;
  358. itemElement = item;
  359. }
  360. if (item === this._document.activeElement) {
  361. position = index;
  362. }
  363. }));
  364. }
  365. // closing on Enter / Space
  366. if (key === Key.Space || key === Key.Enter) {
  367. if (isEventFromItems && (this.autoClose === true || this.autoClose === 'inside')) {
  368. // Item is either a button or a link, so click will be triggered by the browser on Enter or Space.
  369. // So we have to register a one-time click handler that will fire after any user defined click handlers
  370. // to close the dropdown
  371. fromEvent(itemElement, 'click').pipe(take(1)).subscribe((/**
  372. * @return {?}
  373. */
  374. () => this.close()));
  375. }
  376. return;
  377. }
  378. // opening / navigating
  379. if (isEventFromToggle || isEventFromItems) {
  380. this.open();
  381. if (itemElements.length) {
  382. switch (key) {
  383. case Key.ArrowDown:
  384. position = Math.min(position + 1, itemElements.length - 1);
  385. break;
  386. case Key.ArrowUp:
  387. if (this._isDropup() && position === -1) {
  388. position = itemElements.length - 1;
  389. break;
  390. }
  391. position = Math.max(position - 1, 0);
  392. break;
  393. case Key.Home:
  394. position = 0;
  395. break;
  396. case Key.End:
  397. position = itemElements.length - 1;
  398. break;
  399. }
  400. itemElements[position].focus();
  401. }
  402. event.preventDefault();
  403. }
  404. }
  405. /**
  406. * @private
  407. * @return {?}
  408. */
  409. _isDropup() { return this._elementRef.nativeElement.classList.contains('dropup'); }
  410. /**
  411. * @private
  412. * @param {?} event
  413. * @return {?}
  414. */
  415. _isEventFromToggle(event) {
  416. return this._anchor.getNativeElement().contains((/** @type {?} */ (event.target)));
  417. }
  418. /**
  419. * @private
  420. * @return {?}
  421. */
  422. _getMenuElements() {
  423. /** @type {?} */
  424. const menu = this._menu;
  425. if (menu == null) {
  426. return [];
  427. }
  428. return menu.menuItems.filter((/**
  429. * @param {?} item
  430. * @return {?}
  431. */
  432. item => !item.disabled)).map((/**
  433. * @param {?} item
  434. * @return {?}
  435. */
  436. item => item.elementRef.nativeElement));
  437. }
  438. /**
  439. * @private
  440. * @return {?}
  441. */
  442. _positionMenu() {
  443. /** @type {?} */
  444. const menu = this._menu;
  445. if (this.isOpen() && menu) {
  446. this._applyPlacementClasses(this.display === 'dynamic' ?
  447. positionElements(this._anchor.anchorEl, this._bodyContainer || this._menuElement.nativeElement, this.placement, this.container === 'body') :
  448. this._getFirstPlacement(this.placement));
  449. }
  450. }
  451. /**
  452. * @private
  453. * @param {?} placement
  454. * @return {?}
  455. */
  456. _getFirstPlacement(placement) {
  457. return Array.isArray(placement) ? placement[0] : (/** @type {?} */ (placement.split(' ')[0]));
  458. }
  459. /**
  460. * @private
  461. * @return {?}
  462. */
  463. _resetContainer() {
  464. /** @type {?} */
  465. const renderer = this._renderer;
  466. /** @type {?} */
  467. const menuElement = this._menuElement;
  468. if (menuElement) {
  469. /** @type {?} */
  470. const dropdownElement = this._elementRef.nativeElement;
  471. /** @type {?} */
  472. const dropdownMenuElement = menuElement.nativeElement;
  473. renderer.appendChild(dropdownElement, dropdownMenuElement);
  474. renderer.removeStyle(dropdownMenuElement, 'position');
  475. renderer.removeStyle(dropdownMenuElement, 'transform');
  476. }
  477. if (this._bodyContainer) {
  478. renderer.removeChild(this._document.body, this._bodyContainer);
  479. this._bodyContainer = null;
  480. }
  481. }
  482. /**
  483. * @private
  484. * @param {?=} container
  485. * @return {?}
  486. */
  487. _applyContainer(container = null) {
  488. this._resetContainer();
  489. if (container === 'body') {
  490. /** @type {?} */
  491. const renderer = this._renderer;
  492. /** @type {?} */
  493. const dropdownMenuElement = this._menuElement.nativeElement;
  494. /** @type {?} */
  495. const bodyContainer = this._bodyContainer = this._bodyContainer || renderer.createElement('div');
  496. // Override some styles to have the positionning working
  497. renderer.setStyle(bodyContainer, 'position', 'absolute');
  498. renderer.setStyle(dropdownMenuElement, 'position', 'static');
  499. renderer.setStyle(bodyContainer, 'z-index', '1050');
  500. renderer.appendChild(bodyContainer, dropdownMenuElement);
  501. renderer.appendChild(this._document.body, bodyContainer);
  502. }
  503. }
  504. /**
  505. * @private
  506. * @param {?=} placement
  507. * @return {?}
  508. */
  509. _applyPlacementClasses(placement) {
  510. /** @type {?} */
  511. const menu = this._menu;
  512. if (menu) {
  513. if (!placement) {
  514. placement = this._getFirstPlacement(this.placement);
  515. }
  516. /** @type {?} */
  517. const renderer = this._renderer;
  518. /** @type {?} */
  519. const dropdownElement = this._elementRef.nativeElement;
  520. // remove the current placement classes
  521. renderer.removeClass(dropdownElement, 'dropup');
  522. renderer.removeClass(dropdownElement, 'dropdown');
  523. menu.placement = this.display === 'static' ? null : placement;
  524. /*
  525. * apply the new placement
  526. * in case of top use up-arrow or down-arrow otherwise
  527. */
  528. /** @type {?} */
  529. const dropdownClass = placement.search('^top') !== -1 ? 'dropup' : 'dropdown';
  530. renderer.addClass(dropdownElement, dropdownClass);
  531. /** @type {?} */
  532. const bodyContainer = this._bodyContainer;
  533. if (bodyContainer) {
  534. renderer.removeClass(bodyContainer, 'dropup');
  535. renderer.removeClass(bodyContainer, 'dropdown');
  536. renderer.addClass(bodyContainer, dropdownClass);
  537. }
  538. }
  539. }
  540. }
  541. NgbDropdown.decorators = [
  542. { type: Directive, args: [{ selector: '[ngbDropdown]', exportAs: 'ngbDropdown', host: { '[class.show]': 'isOpen()' } },] }
  543. ];
  544. /** @nocollapse */
  545. NgbDropdown.ctorParameters = () => [
  546. { type: ChangeDetectorRef },
  547. { type: NgbDropdownConfig },
  548. { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] },
  549. { type: NgZone },
  550. { type: ElementRef },
  551. { type: Renderer2 },
  552. { type: NgbNavbar, decorators: [{ type: Optional }] }
  553. ];
  554. NgbDropdown.propDecorators = {
  555. _menu: [{ type: ContentChild, args: [NgbDropdownMenu, { static: false },] }],
  556. _menuElement: [{ type: ContentChild, args: [NgbDropdownMenu, { read: ElementRef, static: false },] }],
  557. _anchor: [{ type: ContentChild, args: [NgbDropdownAnchor, { static: false },] }],
  558. autoClose: [{ type: Input }],
  559. _open: [{ type: Input, args: ['open',] }],
  560. placement: [{ type: Input }],
  561. container: [{ type: Input }],
  562. display: [{ type: Input }],
  563. openChange: [{ type: Output }]
  564. };
  565. if (false) {
  566. /**
  567. * @type {?}
  568. * @private
  569. */
  570. NgbDropdown.prototype._closed$;
  571. /**
  572. * @type {?}
  573. * @private
  574. */
  575. NgbDropdown.prototype._zoneSubscription;
  576. /**
  577. * @type {?}
  578. * @private
  579. */
  580. NgbDropdown.prototype._bodyContainer;
  581. /**
  582. * @type {?}
  583. * @private
  584. */
  585. NgbDropdown.prototype._menu;
  586. /**
  587. * @type {?}
  588. * @private
  589. */
  590. NgbDropdown.prototype._menuElement;
  591. /**
  592. * @type {?}
  593. * @private
  594. */
  595. NgbDropdown.prototype._anchor;
  596. /**
  597. * Indicates whether the dropdown should be closed when clicking one of dropdown items or pressing ESC.
  598. *
  599. * * `true` - the dropdown will close on both outside and inside (menu) clicks.
  600. * * `false` - the dropdown can only be closed manually via `close()` or `toggle()` methods.
  601. * * `"inside"` - the dropdown will close on inside menu clicks, but not outside clicks.
  602. * * `"outside"` - the dropdown will close only on the outside clicks and not on menu clicks.
  603. * @type {?}
  604. */
  605. NgbDropdown.prototype.autoClose;
  606. /**
  607. * Defines whether or not the dropdown menu is opened initially.
  608. * @type {?}
  609. */
  610. NgbDropdown.prototype._open;
  611. /**
  612. * The preferred placement of the dropdown.
  613. *
  614. * Possible values are `"top"`, `"top-left"`, `"top-right"`, `"bottom"`, `"bottom-left"`,
  615. * `"bottom-right"`, `"left"`, `"left-top"`, `"left-bottom"`, `"right"`, `"right-top"`,
  616. * `"right-bottom"`
  617. *
  618. * Accepts an array of strings or a string with space separated possible values.
  619. *
  620. * The default order of preference is `"bottom-left bottom-right top-left top-right"`
  621. *
  622. * Please see the [positioning overview](#/positioning) for more details.
  623. * @type {?}
  624. */
  625. NgbDropdown.prototype.placement;
  626. /**
  627. * A selector specifying the element the dropdown should be appended to.
  628. * Currently only supports "body".
  629. *
  630. * \@since 4.1.0
  631. * @type {?}
  632. */
  633. NgbDropdown.prototype.container;
  634. /**
  635. * Enable or disable the dynamic positioning. The default value is dynamic unless the dropdown is used
  636. * inside a Bootstrap navbar. If you need custom placement for a dropdown in a navbar, set it to
  637. * dynamic explicitly. See the [positioning of dropdown](#/positioning#dropdown)
  638. * and the [navbar demo](/#/components/dropdown/examples#navbar) for more details.
  639. *
  640. * \@since 4.2.0
  641. * @type {?}
  642. */
  643. NgbDropdown.prototype.display;
  644. /**
  645. * An event fired when the dropdown is opened or closed.
  646. *
  647. * The event payload is a `boolean`:
  648. * * `true` - the dropdown was opened
  649. * * `false` - the dropdown was closed
  650. * @type {?}
  651. */
  652. NgbDropdown.prototype.openChange;
  653. /**
  654. * @type {?}
  655. * @private
  656. */
  657. NgbDropdown.prototype._changeDetector;
  658. /**
  659. * @type {?}
  660. * @private
  661. */
  662. NgbDropdown.prototype._document;
  663. /**
  664. * @type {?}
  665. * @private
  666. */
  667. NgbDropdown.prototype._ngZone;
  668. /**
  669. * @type {?}
  670. * @private
  671. */
  672. NgbDropdown.prototype._elementRef;
  673. /**
  674. * @type {?}
  675. * @private
  676. */
  677. NgbDropdown.prototype._renderer;
  678. }
  679. //# 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{\n  ChangeDetectorRef,\n  ContentChild,\n  ContentChildren,\n  Directive,\n  ElementRef,\n  EventEmitter,\n  forwardRef,\n  Inject,\n  Input,\n  NgZone,\n  AfterContentInit,\n  OnDestroy,\n  Output,\n  QueryList,\n  Renderer2,\n  SimpleChanges,\n  Optional\n} from '@angular/core';\nimport {DOCUMENT} from '@angular/common';\nimport {fromEvent, Subject, Subscription} from 'rxjs';\nimport {take} from 'rxjs/operators';\n\nimport {Placement, PlacementArray, positionElements} from '../util/positioning';\nimport {ngbAutoClose} from '../util/autoclose';\nimport {Key} from '../util/key';\n\nimport {NgbDropdownConfig} from './dropdown-config';\n\n@Directive({selector: '.navbar'})\nexport class NgbNavbar {\n}\n\n/**\n * A directive you should put on a dropdown item to enable keyboard navigation.\n * Arrow keys will move focus between items marked with this directive.\n *\n * @since 4.1.0\n */\n@Directive({selector: '[ngbDropdownItem]', host: {'class': 'dropdown-item', '[class.disabled]': 'disabled'}})\nexport class NgbDropdownItem {\n  private _disabled = false;\n\n  @Input()\n  set disabled(value: boolean) {\n    this._disabled = <any>value === '' || value === true;  // accept an empty attribute as true\n  }\n\n  get disabled(): boolean { return this._disabled; }\n\n  constructor(public elementRef: ElementRef<HTMLElement>) {}\n}\n\n/**\n * A directive that wraps dropdown menu content and dropdown items.\n */\n@Directive({\n  selector: '[ngbDropdownMenu]',\n  host: {\n    '[class.dropdown-menu]': 'true',\n    '[class.show]': 'dropdown.isOpen()',\n    '[attr.x-placement]': 'placement',\n    '(keydown.ArrowUp)': 'dropdown.onKeyDown($event)',\n    '(keydown.ArrowDown)': 'dropdown.onKeyDown($event)',\n    '(keydown.Home)': 'dropdown.onKeyDown($event)',\n    '(keydown.End)': 'dropdown.onKeyDown($event)',\n    '(keydown.Enter)': 'dropdown.onKeyDown($event)',\n    '(keydown.Space)': 'dropdown.onKeyDown($event)'\n  }\n})\nexport class NgbDropdownMenu {\n  placement: Placement = 'bottom';\n  isOpen = false;\n\n  @ContentChildren(NgbDropdownItem) menuItems: QueryList<NgbDropdownItem>;\n\n  constructor(@Inject(forwardRef(() => NgbDropdown)) public dropdown) {}\n}\n\n/**\n * A directive to mark an element to which dropdown menu will be anchored.\n *\n * This is a simple version of the `NgbDropdownToggle` directive.\n * It plays the same role, but doesn't listen to click events to toggle dropdown menu thus enabling support\n * for events other than click.\n *\n * @since 1.1.0\n */\n@Directive({\n  selector: '[ngbDropdownAnchor]',\n  host: {'class': 'dropdown-toggle', 'aria-haspopup': 'true', '[attr.aria-expanded]': 'dropdown.isOpen()'}\n})\nexport class NgbDropdownAnchor {\n  anchorEl;\n\n  constructor(@Inject(forwardRef(() => NgbDropdown)) public dropdown, private _elementRef: ElementRef<HTMLElement>) {\n    this.anchorEl = _elementRef.nativeElement;\n  }\n\n  getNativeElement() { return this._elementRef.nativeElement; }\n}\n\n/**\n * A directive to mark an element that will toggle dropdown via the `click` event.\n *\n * You can also use `NgbDropdownAnchor` as an alternative.\n */\n@Directive({\n  selector: '[ngbDropdownToggle]',\n  host: {\n    'class': 'dropdown-toggle',\n    'aria-haspopup': 'true',\n    '[attr.aria-expanded]': 'dropdown.isOpen()',\n    '(click)': 'dropdown.toggle()',\n    '(keydown.ArrowUp)': 'dropdown.onKeyDown($event)',\n    '(keydown.ArrowDown)': 'dropdown.onKeyDown($event)',\n    '(keydown.Home)': 'dropdown.onKeyDown($event)',\n    '(keydown.End)': 'dropdown.onKeyDown($event)'\n  },\n  providers: [{provide: NgbDropdownAnchor, useExisting: forwardRef(() => NgbDropdownToggle)}]\n})\nexport class NgbDropdownToggle extends NgbDropdownAnchor {\n  constructor(@Inject(forwardRef(() => NgbDropdown)) dropdown, elementRef: ElementRef<HTMLElement>) {\n    super(dropdown, elementRef);\n  }\n}\n\n/**\n * A directive that provides contextual overlays for displaying lists of links and more.\n */\n@Directive({selector: '[ngbDropdown]', exportAs: 'ngbDropdown', host: {'[class.show]': 'isOpen()'}})\nexport class NgbDropdown implements AfterContentInit, OnDestroy {\n  private _closed$ = new Subject<void>();\n  private _zoneSubscription: Subscription;\n  private _bodyContainer: HTMLElement;\n\n  @ContentChild(NgbDropdownMenu, {static: false}) private _menu: NgbDropdownMenu;\n  @ContentChild(NgbDropdownMenu, {read: ElementRef, static: false}) private _menuElement: ElementRef;\n  @ContentChild(NgbDropdownAnchor, {static: false}) private _anchor: NgbDropdownAnchor;\n\n  /**\n   * Indicates whether the dropdown should be closed when clicking one of dropdown items or pressing ESC.\n   *\n   * * `true` - the dropdown will close on both outside and inside (menu) clicks.\n   * * `false` - the dropdown can only be closed manually via `close()` or `toggle()` methods.\n   * * `\"inside\"` - the dropdown will close on inside menu clicks, but not outside clicks.\n   * * `\"outside\"` - the dropdown will close only on the outside clicks and not on menu clicks.\n   */\n  @Input() autoClose: boolean | 'outside' | 'inside';\n\n  /**\n   * Defines whether or not the dropdown menu is opened initially.\n   */\n  @Input('open') _open = false;\n\n  /**\n   * The preferred placement of the dropdown.\n   *\n   * Possible values are `\"top\"`, `\"top-left\"`, `\"top-right\"`, `\"bottom\"`, `\"bottom-left\"`,\n   * `\"bottom-right\"`, `\"left\"`, `\"left-top\"`, `\"left-bottom\"`, `\"right\"`, `\"right-top\"`,\n   * `\"right-bottom\"`\n   *\n   * Accepts an array of strings or a string with space separated possible values.\n   *\n   * The default order of preference is `\"bottom-left bottom-right top-left top-right\"`\n   *\n   * Please see the [positioning overview](#/positioning) for more details.\n   */\n  @Input() placement: PlacementArray;\n\n  /**\n  * A selector specifying the element the dropdown should be appended to.\n  * Currently only supports \"body\".\n  *\n  * @since 4.1.0\n  */\n  @Input() container: null | 'body';\n\n  /**\n   * Enable or disable the dynamic positioning. The default value is dynamic unless the dropdown is used\n   * inside a Bootstrap navbar. If you need custom placement for a dropdown in a navbar, set it to\n   * dynamic explicitly. See the [positioning of dropdown](#/positioning#dropdown)\n   * and the [navbar demo](/#/components/dropdown/examples#navbar) for more details.\n   *\n   * @since 4.2.0\n   */\n  @Input() display: 'dynamic' | 'static';\n\n  /**\n   * An event fired when the dropdown is opened or closed.\n   *\n   * The event payload is a `boolean`:\n   * * `true` - the dropdown was opened\n   * * `false` - the dropdown was closed\n   */\n  @Output() openChange = new EventEmitter<boolean>();\n\n  constructor(\n      private _changeDetector: ChangeDetectorRef, config: NgbDropdownConfig, @Inject(DOCUMENT) private _document: any,\n      private _ngZone: NgZone, private _elementRef: ElementRef<HTMLElement>, private _renderer: Renderer2,\n      @Optional() ngbNavbar: NgbNavbar) {\n    this.placement = config.placement;\n    this.container = config.container;\n    this.autoClose = config.autoClose;\n\n    this.display = ngbNavbar ? 'static' : 'dynamic';\n\n    this._zoneSubscription = _ngZone.onStable.subscribe(() => { this._positionMenu(); });\n  }\n\n  ngAfterContentInit() {\n    this._ngZone.onStable.pipe(take(1)).subscribe(() => {\n      this._applyPlacementClasses();\n      if (this._open) {\n        this._setCloseHandlers();\n      }\n    });\n  }\n\n  ngOnChanges(changes: SimpleChanges) {\n    if (changes.container && this._open) {\n      this._applyContainer(this.container);\n    }\n\n    if (changes.placement && !changes.placement.isFirstChange) {\n      this._applyPlacementClasses();\n    }\n  }\n\n  /**\n   * Checks if the dropdown menu is open.\n   */\n  isOpen(): boolean { return this._open; }\n\n  /**\n   * Opens the dropdown menu.\n   */\n  open(): void {\n    if (!this._open) {\n      this._open = true;\n      this._applyContainer(this.container);\n      this.openChange.emit(true);\n      this._setCloseHandlers();\n    }\n  }\n\n  private _setCloseHandlers() {\n    const anchor = this._anchor;\n    ngbAutoClose(\n        this._ngZone, this._document, this.autoClose, () => this.close(), this._closed$,\n        this._menu ? [this._menuElement.nativeElement] : [], anchor ? [anchor.getNativeElement()] : [],\n        '.dropdown-item,.dropdown-divider');\n  }\n\n  /**\n   * Closes the dropdown menu.\n   */\n  close(): void {\n    if (this._open) {\n      this._open = false;\n      this._resetContainer();\n      this._closed$.next();\n      this.openChange.emit(false);\n      this._changeDetector.markForCheck();\n    }\n  }\n\n  /**\n   * Toggles the dropdown menu.\n   */\n  toggle(): void {\n    if (this.isOpen()) {\n      this.close();\n    } else {\n      this.open();\n    }\n  }\n\n  ngOnDestroy() {\n    this._resetContainer();\n\n    this._closed$.next();\n    this._zoneSubscription.unsubscribe();\n  }\n\n  onKeyDown(event: KeyboardEvent) {\n    // tslint:disable-next-line:deprecation\n    const key = event.which;\n    const itemElements = this._getMenuElements();\n\n    let position = -1;\n    let isEventFromItems = false;\n    let itemElement: HTMLElement = null;\n    const isEventFromToggle = this._isEventFromToggle(event);\n\n    if (!isEventFromToggle && itemElements.length) {\n      itemElements.forEach((item, index) => {\n        if (item.contains(event.target as HTMLElement)) {\n          isEventFromItems = true;\n          itemElement = item;\n        }\n        if (item === this._document.activeElement) {\n          position = index;\n        }\n      });\n    }\n\n    // closing on Enter / Space\n    if (key === Key.Space || key === Key.Enter) {\n      if (isEventFromItems && (this.autoClose === true || this.autoClose === 'inside')) {\n        // Item is either a button or a link, so click will be triggered by the browser on Enter or Space.\n        // So we have to register a one-time click handler that will fire after any user defined click handlers\n        // to close the dropdown\n        fromEvent(itemElement, 'click').pipe(take(1)).subscribe(() => this.close());\n      }\n      return;\n    }\n\n    // opening / navigating\n    if (isEventFromToggle || isEventFromItems) {\n      this.open();\n\n      if (itemElements.length) {\n        switch (key) {\n          case Key.ArrowDown:\n            position = Math.min(position + 1, itemElements.length - 1);\n            break;\n          case Key.ArrowUp:\n            if (this._isDropup() && position === -1) {\n              position = itemElements.length - 1;\n              break;\n            }\n            position = Math.max(position - 1, 0);\n            break;\n          case Key.Home:\n            position = 0;\n            break;\n          case Key.End:\n            position = itemElements.length - 1;\n            break;\n        }\n        itemElements[position].focus();\n      }\n      event.preventDefault();\n    }\n  }\n\n  private _isDropup(): boolean { return this._elementRef.nativeElement.classList.contains('dropup'); }\n\n  private _isEventFromToggle(event: KeyboardEvent) {\n    return this._anchor.getNativeElement().contains(event.target as HTMLElement);\n  }\n\n  private _getMenuElements(): HTMLElement[] {\n    const menu = this._menu;\n    if (menu == null) {\n      return [];\n    }\n    return menu.menuItems.filter(item => !item.disabled).map(item => item.elementRef.nativeElement);\n  }\n\n  private _positionMenu() {\n    const menu = this._menu;\n    if (this.isOpen() && menu) {\n      this._applyPlacementClasses(\n          this.display === 'dynamic' ?\n              positionElements(\n                  this._anchor.anchorEl, this._bodyContainer || this._menuElement.nativeElement, this.placement,\n                  this.container === 'body') :\n              this._getFirstPlacement(this.placement));\n    }\n  }\n\n  private _getFirstPlacement(placement: PlacementArray): Placement {\n    return Array.isArray(placement) ? placement[0] : placement.split(' ')[0] as Placement;\n  }\n\n  private _resetContainer() {\n    const renderer = this._renderer;\n    const menuElement = this._menuElement;\n    if (menuElement) {\n      const dropdownElement = this._elementRef.nativeElement;\n      const dropdownMenuElement = menuElement.nativeElement;\n\n      renderer.appendChild(dropdownElement, dropdownMenuElement);\n      renderer.removeStyle(dropdownMenuElement, 'position');\n      renderer.removeStyle(dropdownMenuElement, 'transform');\n    }\n    if (this._bodyContainer) {\n      renderer.removeChild(this._document.body, this._bodyContainer);\n      this._bodyContainer = null;\n    }\n  }\n\n  private _applyContainer(container: null | 'body' = null) {\n    this._resetContainer();\n    if (container === 'body') {\n      const renderer = this._renderer;\n      const dropdownMenuElement = this._menuElement.nativeElement;\n      const bodyContainer = this._bodyContainer = this._bodyContainer || renderer.createElement('div');\n\n      // Override some styles to have the positionning working\n      renderer.setStyle(bodyContainer, 'position', 'absolute');\n      renderer.setStyle(dropdownMenuElement, 'position', 'static');\n      renderer.setStyle(bodyContainer, 'z-index', '1050');\n\n      renderer.appendChild(bodyContainer, dropdownMenuElement);\n      renderer.appendChild(this._document.body, bodyContainer);\n    }\n  }\n\n  private _applyPlacementClasses(placement?: Placement) {\n    const menu = this._menu;\n    if (menu) {\n      if (!placement) {\n        placement = this._getFirstPlacement(this.placement);\n      }\n\n      const renderer = this._renderer;\n      const dropdownElement = this._elementRef.nativeElement;\n\n      // remove the current placement classes\n      renderer.removeClass(dropdownElement, 'dropup');\n      renderer.removeClass(dropdownElement, 'dropdown');\n      menu.placement = this.display === 'static' ? null : placement;\n\n      /*\n      * apply the new placement\n      * in case of top use up-arrow or down-arrow otherwise\n      */\n      const dropdownClass = placement.search('^top') !== -1 ? 'dropup' : 'dropdown';\n      renderer.addClass(dropdownElement, dropdownClass);\n\n      const bodyContainer = this._bodyContainer;\n      if (bodyContainer) {\n        renderer.removeClass(bodyContainer, 'dropup');\n        renderer.removeClass(bodyContainer, 'dropdown');\n        renderer.addClass(bodyContainer, dropdownClass);\n      }\n    }\n  }\n}\n"]}