@ionic/core/dist/cjs/ion-nav_2.cjs.entry.js

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

const index = require('./index-a0a08b2a.js');
const ionicGlobal = require('./ionic-global-06f21c1a.js');
const cubicBezier = require('./cubic-bezier-0b2ccc35.js');
const helpers = require('./helpers-d381ec4d.js');
const index$1 = require('./index-222357e4.js');
const frameworkDelegate = require('./framework-delegate-45524d8c.js');

const VIEW_STATE_NEW = 1;
const VIEW_STATE_ATTACHED = 2;
const VIEW_STATE_DESTROYED = 3;
class ViewController {
  constructor(component, params) {
    this.component = component;
    this.params = params;
    this.state = VIEW_STATE_NEW;
  }
  async init(container) {
    this.state = VIEW_STATE_ATTACHED;
    if (!this.element) {
      const component = this.component;
      this.element = await frameworkDelegate.attachComponent(this.delegate, container, component, ['ion-page', 'ion-page-invisible'], this.params);
    }
  }
  /**
   * DOM WRITE
   */
  _destroy() {
    helpers.assert(this.state !== VIEW_STATE_DESTROYED, 'view state must be ATTACHED');
    const element = this.element;
    if (element) {
      if (this.delegate) {
        this.delegate.removeViewFromDom(element.parentElement, element);
      }
      else {
        element.remove();
      }
    }
    this.nav = undefined;
    this.state = VIEW_STATE_DESTROYED;
  }
}
const matches = (view, id, params) => {
  if (!view) {
    return false;
  }
  if (view.component !== id) {
    return false;
  }
  const currentParams = view.params;
  if (currentParams === params) {
    return true;
  }
  if (!currentParams && !params) {
    return true;
  }
  if (!currentParams || !params) {
    return false;
  }
  const keysA = Object.keys(currentParams);
  const keysB = Object.keys(params);
  if (keysA.length !== keysB.length) {
    return false;
  }
  // Test for A's keys different from B.
  for (const key of keysA) {
    if (currentParams[key] !== params[key]) {
      return false;
    }
  }
  return true;
};
const convertToView = (page, params) => {
  if (!page) {
    return null;
  }
  if (page instanceof ViewController) {
    return page;
  }
  return new ViewController(page, params);
};
const convertToViews = (pages) => {
  return pages.map(page => {
    if (page instanceof ViewController) {
      return page;
    }
    if ('component' in page) {
      /**
       * TODO Ionic 6:
       * Consider switching to just using `undefined` here
       * as well as on the public interfaces and on
       * `NavComponentWithProps`. Previously `pages` was
       * of type `any[]` so TypeScript did not catch this.
       */
      return convertToView(page.component, (page.componentProps === null) ? undefined : page.componentProps);
    }
    return convertToView(page, undefined);
  }).filter(v => v !== null);
};

const navCss = ":host{left:0;right:0;top:0;bottom:0;position:absolute;contain:layout size style;overflow:hidden;z-index:0}";

const Nav = class {
  constructor(hostRef) {
    index.registerInstance(this, hostRef);
    this.ionNavWillLoad = index.createEvent(this, "ionNavWillLoad", 7);
    this.ionNavWillChange = index.createEvent(this, "ionNavWillChange", 3);
    this.ionNavDidChange = index.createEvent(this, "ionNavDidChange", 3);
    this.transInstr = [];
    this.animationEnabled = true;
    this.useRouter = false;
    this.isTransitioning = false;
    this.destroyed = false;
    this.views = [];
    /**
     * If `true`, the nav should animate the transition of components.
     */
    this.animated = true;
  }
  swipeGestureChanged() {
    if (this.gesture) {
      this.gesture.enable(this.swipeGesture === true);
    }
  }
  rootChanged() {
    if (this.root !== undefined) {
      if (!this.useRouter) {
        this.setRoot(this.root, this.rootParams);
      }
    }
  }
  componentWillLoad() {
    this.useRouter =
      !!document.querySelector('ion-router') &&
        !this.el.closest('[no-router]');
    if (this.swipeGesture === undefined) {
      const mode = ionicGlobal.getIonMode(this);
      this.swipeGesture = ionicGlobal.config.getBoolean('swipeBackEnabled', mode === 'ios');
    }
    this.ionNavWillLoad.emit();
  }
  async componentDidLoad() {
    this.rootChanged();
    this.gesture = (await Promise.resolve().then(function () { return require('./swipe-back-e654d7fd.js'); })).createSwipeBackGesture(this.el, this.canStart.bind(this), this.onStart.bind(this), this.onMove.bind(this), this.onEnd.bind(this));
    this.swipeGestureChanged();
  }
  disconnectedCallback() {
    for (const view of this.views) {
      index$1.lifecycle(view.element, index$1.LIFECYCLE_WILL_UNLOAD);
      view._destroy();
    }
    if (this.gesture) {
      this.gesture.destroy();
      this.gesture = undefined;
    }
    // release swipe back gesture and transition
    this.transInstr.length = this.views.length = 0;
    this.destroyed = true;
  }
  /**
   * Push a new component onto the current navigation stack. Pass any additional
   * information along as an object. This additional information is accessible
   * through NavParams.
   *
   * @param component The component to push onto the navigation stack.
   * @param componentProps Any properties of the component.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  push(component, componentProps, opts, done) {
    return this.queueTrns({
      insertStart: -1,
      insertViews: [{ component, componentProps }],
      opts
    }, done);
  }
  /**
   * Inserts a component into the navigation stack at the specified index.
   * This is useful to add a component at any point in the navigation stack.
   *
   * @param insertIndex The index to insert the component at in the stack.
   * @param component The component to insert into the navigation stack.
   * @param componentProps Any properties of the component.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  insert(insertIndex, component, componentProps, opts, done) {
    return this.queueTrns({
      insertStart: insertIndex,
      insertViews: [{ component, componentProps }],
      opts
    }, done);
  }
  /**
   * Inserts an array of components into the navigation stack at the specified index.
   * The last component in the array will become instantiated as a view, and animate
   * in to become the active view.
   *
   * @param insertIndex The index to insert the components at in the stack.
   * @param insertComponents The components to insert into the navigation stack.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  insertPages(insertIndex, insertComponents, opts, done) {
    return this.queueTrns({
      insertStart: insertIndex,
      insertViews: insertComponents,
      opts
    }, done);
  }
  /**
   * Pop a component off of the navigation stack. Navigates back from the current
   * component.
   *
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  pop(opts, done) {
    return this.queueTrns({
      removeStart: -1,
      removeCount: 1,
      opts
    }, done);
  }
  /**
   * Pop to a specific index in the navigation stack.
   *
   * @param indexOrViewCtrl The index or view controller to pop to.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  popTo(indexOrViewCtrl, opts, done) {
    const tiConfig = {
      removeStart: -1,
      removeCount: -1,
      opts
    };
    if (typeof indexOrViewCtrl === 'object' && indexOrViewCtrl.component) {
      tiConfig.removeView = indexOrViewCtrl;
      tiConfig.removeStart = 1;
    }
    else if (typeof indexOrViewCtrl === 'number') {
      tiConfig.removeStart = indexOrViewCtrl + 1;
    }
    return this.queueTrns(tiConfig, done);
  }
  /**
   * Navigate back to the root of the stack, no matter how far back that is.
   *
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  popToRoot(opts, done) {
    return this.queueTrns({
      removeStart: 1,
      removeCount: -1,
      opts
    }, done);
  }
  /**
   * Removes a component from the navigation stack at the specified index.
   *
   * @param startIndex The number to begin removal at.
   * @param removeCount The number of components to remove.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  removeIndex(startIndex, removeCount = 1, opts, done) {
    return this.queueTrns({
      removeStart: startIndex,
      removeCount,
      opts
    }, done);
  }
  /**
   * Set the root for the current navigation stack to a component.
   *
   * @param component The component to set as the root of the navigation stack.
   * @param componentProps Any properties of the component.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  setRoot(component, componentProps, opts, done) {
    return this.setPages([{ component, componentProps }], opts, done);
  }
  /**
   * Set the views of the current navigation stack and navigate to the last view.
   * By default animations are disabled, but they can be enabled by passing options
   * to the navigation controller. Navigation parameters can also be passed to the
   * individual pages in the array.
   *
   * @param views The list of views to set as the navigation stack.
   * @param opts The navigation options.
   * @param done The transition complete function.
   */
  setPages(views, opts, done) {
    if (opts == null) {
      opts = {};
    }
    // if animation wasn't set to true then default it to NOT animate
    if (opts.animated !== true) {
      opts.animated = false;
    }
    return this.queueTrns({
      insertStart: 0,
      insertViews: views,
      removeStart: 0,
      removeCount: -1,
      opts
    }, done);
  }
  /** @internal */
  setRouteId(id, params, direction, animation) {
    const active = this.getActiveSync();
    if (matches(active, id, params)) {
      return Promise.resolve({
        changed: false,
        element: active.element
      });
    }
    let resolve;
    const promise = new Promise(r => (resolve = r));
    let finish;
    const commonOpts = {
      updateURL: false,
      viewIsReady: enteringEl => {
        let mark;
        const p = new Promise(r => (mark = r));
        resolve({
          changed: true,
          element: enteringEl,
          markVisible: async () => {
            mark();
            await finish;
          }
        });
        return p;
      }
    };
    if (direction === 'root') {
      finish = this.setRoot(id, params, commonOpts);
    }
    else {
      const viewController = this.views.find(v => matches(v, id, params));
      if (viewController) {
        finish = this.popTo(viewController, Object.assign(Object.assign({}, commonOpts), { direction: 'back', animationBuilder: animation }));
      }
      else if (direction === 'forward') {
        finish = this.push(id, params, Object.assign(Object.assign({}, commonOpts), { animationBuilder: animation }));
      }
      else if (direction === 'back') {
        finish = this.setRoot(id, params, Object.assign(Object.assign({}, commonOpts), { direction: 'back', animated: true, animationBuilder: animation }));
      }
    }
    return promise;
  }
  /** @internal */
  async getRouteId() {
    const active = this.getActiveSync();
    return active
      ? {
        id: active.element.tagName,
        params: active.params,
        element: active.element
      }
      : undefined;
  }
  /**
   * Get the active view.
   */
  getActive() {
    return Promise.resolve(this.getActiveSync());
  }
  /**
   * Get the view at the specified index.
   *
   * @param index The index of the view.
   */
  getByIndex(index) {
    return Promise.resolve(this.views[index]);
  }
  /**
   * Returns `true` if the current view can go back.
   *
   * @param view The view to check.
   */
  canGoBack(view) {
    return Promise.resolve(this.canGoBackSync(view));
  }
  /**
   * Get the previous view.
   *
   * @param view The view to get.
   */
  getPrevious(view) {
    return Promise.resolve(this.getPreviousSync(view));
  }
  getLength() {
    return this.views.length;
  }
  getActiveSync() {
    return this.views[this.views.length - 1];
  }
  canGoBackSync(view = this.getActiveSync()) {
    return !!(view && this.getPreviousSync(view));
  }
  getPreviousSync(view = this.getActiveSync()) {
    if (!view) {
      return undefined;
    }
    const views = this.views;
    const index = views.indexOf(view);
    return index > 0 ? views[index - 1] : undefined;
  }
  // _queueTrns() adds a navigation stack change to the queue and schedules it to run:
  // 1. _nextTrns(): consumes the next transition in the queue
  // 2. _viewInit(): initializes enteringView if required
  // 3. _viewTest(): ensures canLeave/canEnter Returns `true`, so the operation can continue
  // 4. _postViewInit(): add/remove the views from the navigation stack
  // 5. _transitionInit(): initializes the visual transition if required and schedules it to run
  // 6. _viewAttachToDOM(): attaches the enteringView to the DOM
  // 7. _transitionStart(): called once the transition actually starts, it initializes the Animation underneath.
  // 8. _transitionFinish(): called once the transition finishes
  // 9. _cleanup(): syncs the navigation internal state with the DOM. For example it removes the pages from the DOM or hides/show them.
  async queueTrns(ti, done) {
    if (this.isTransitioning && ti.opts != null && ti.opts.skipIfBusy) {
      return Promise.resolve(false);
    }
    const promise = new Promise((resolve, reject) => {
      ti.resolve = resolve;
      ti.reject = reject;
    });
    ti.done = done;
    /**
     * If using router, check to see if navigation hooks
     * will allow us to perform this transition. This
     * is required in order for hooks to work with
     * the ion-back-button or swipe to go back.
     */
    if (ti.opts && ti.opts.updateURL !== false && this.useRouter) {
      const router = document.querySelector('ion-router');
      if (router) {
        const canTransition = await router.canTransition();
        if (canTransition === false) {
          return Promise.resolve(false);
        }
        else if (typeof canTransition === 'string') {
          router.push(canTransition, ti.opts.direction || 'back');
          return Promise.resolve(false);
        }
      }
    }
    // Normalize empty
    if (ti.insertViews && ti.insertViews.length === 0) {
      ti.insertViews = undefined;
    }
    // Enqueue transition instruction
    this.transInstr.push(ti);
    // if there isn't a transition already happening
    // then this will kick off this transition
    this.nextTrns();
    return promise;
  }
  success(result, ti) {
    if (this.destroyed) {
      this.fireError('nav controller was destroyed', ti);
      return;
    }
    if (ti.done) {
      ti.done(result.hasCompleted, result.requiresTransition, result.enteringView, result.leavingView, result.direction);
    }
    ti.resolve(result.hasCompleted);
    if (ti.opts.updateURL !== false && this.useRouter) {
      const router = document.querySelector('ion-router');
      if (router) {
        const direction = result.direction === 'back' ? 'back' : 'forward';
        router.navChanged(direction);
      }
    }
  }
  failed(rejectReason, ti) {
    if (this.destroyed) {
      this.fireError('nav controller was destroyed', ti);
      return;
    }
    this.transInstr.length = 0;
    this.fireError(rejectReason, ti);
  }
  fireError(rejectReason, ti) {
    if (ti.done) {
      ti.done(false, false, rejectReason);
    }
    if (ti.reject && !this.destroyed) {
      ti.reject(rejectReason);
    }
    else {
      ti.resolve(false);
    }
  }
  nextTrns() {
    // this is the framework's bread 'n butta function
    // only one transition is allowed at any given time
    if (this.isTransitioning) {
      return false;
    }
    // there is no transition happening right now
    // get the next instruction
    const ti = this.transInstr.shift();
    if (!ti) {
      return false;
    }
    this.runTransition(ti);
    return true;
  }
  async runTransition(ti) {
    try {
      // set that this nav is actively transitioning
      this.ionNavWillChange.emit();
      this.isTransitioning = true;
      this.prepareTI(ti);
      const leavingView = this.getActiveSync();
      const enteringView = this.getEnteringView(ti, leavingView);
      if (!leavingView && !enteringView) {
        throw new Error('no views in the stack to be removed');
      }
      if (enteringView && enteringView.state === VIEW_STATE_NEW) {
        await enteringView.init(this.el);
      }
      this.postViewInit(enteringView, leavingView, ti);
      // Needs transition?
      const requiresTransition = (ti.enteringRequiresTransition || ti.leavingRequiresTransition) &&
        enteringView !== leavingView;
      if (requiresTransition && ti.opts && leavingView) {
        const isBackDirection = ti.opts.direction === 'back';
        /**
         * If heading back, use the entering page's animation
         * unless otherwise specified by the developer.
         */
        if (isBackDirection) {
          ti.opts.animationBuilder = ti.opts.animationBuilder || (enteringView && enteringView.animationBuilder);
        }
        leavingView.animationBuilder = ti.opts.animationBuilder;
      }
      const result = requiresTransition
        ? await this.transition(enteringView, leavingView, ti)
        : {
          // transition is not required, so we are already done!
          // they're inserting/removing the views somewhere in the middle or
          // beginning, so visually nothing needs to animate/transition
          // resolve immediately because there's no animation that's happening
          hasCompleted: true,
          requiresTransition: false
        };
      this.success(result, ti);
      this.ionNavDidChange.emit();
    }
    catch (rejectReason) {
      this.failed(rejectReason, ti);
    }
    this.isTransitioning = false;
    this.nextTrns();
  }
  prepareTI(ti) {
    const viewsLength = this.views.length;
    ti.opts = ti.opts || {};
    if (ti.opts.delegate === undefined) {
      ti.opts.delegate = this.delegate;
    }
    if (ti.removeView !== undefined) {
      helpers.assert(ti.removeStart !== undefined, 'removeView needs removeStart');
      helpers.assert(ti.removeCount !== undefined, 'removeView needs removeCount');
      const index = this.views.indexOf(ti.removeView);
      if (index < 0) {
        throw new Error('removeView was not found');
      }
      ti.removeStart += index;
    }
    if (ti.removeStart !== undefined) {
      if (ti.removeStart < 0) {
        ti.removeStart = viewsLength - 1;
      }
      if (ti.removeCount < 0) {
        ti.removeCount = viewsLength - ti.removeStart;
      }
      ti.leavingRequiresTransition =
        ti.removeCount > 0 && ti.removeStart + ti.removeCount === viewsLength;
    }
    if (ti.insertViews) {
      // allow -1 to be passed in to auto push it on the end
      // and clean up the index if it's larger then the size of the stack
      if (ti.insertStart < 0 || ti.insertStart > viewsLength) {
        ti.insertStart = viewsLength;
      }
      ti.enteringRequiresTransition = ti.insertStart === viewsLength;
    }
    const insertViews = ti.insertViews;
    if (!insertViews) {
      return;
    }
    helpers.assert(insertViews.length > 0, 'length can not be zero');
    const viewControllers = convertToViews(insertViews);
    if (viewControllers.length === 0) {
      throw new Error('invalid views to insert');
    }
    // Check all the inserted view are correct
    for (const view of viewControllers) {
      view.delegate = ti.opts.delegate;
      const nav = view.nav;
      if (nav && nav !== this) {
        throw new Error('inserted view was already inserted');
      }
      if (view.state === VIEW_STATE_DESTROYED) {
        throw new Error('inserted view was already destroyed');
      }
    }
    ti.insertViews = viewControllers;
  }
  getEnteringView(ti, leavingView) {
    const insertViews = ti.insertViews;
    if (insertViews !== undefined) {
      // grab the very last view of the views to be inserted
      // and initialize it as the new entering view
      return insertViews[insertViews.length - 1];
    }
    const removeStart = ti.removeStart;
    if (removeStart !== undefined) {
      const views = this.views;
      const removeEnd = removeStart + ti.removeCount;
      for (let i = views.length - 1; i >= 0; i--) {
        const view = views[i];
        if ((i < removeStart || i >= removeEnd) && view !== leavingView) {
          return view;
        }
      }
    }
    return undefined;
  }
  postViewInit(enteringView, leavingView, ti) {
    helpers.assert(leavingView || enteringView, 'Both leavingView and enteringView are null');
    helpers.assert(ti.resolve, 'resolve must be valid');
    helpers.assert(ti.reject, 'reject must be valid');
    const opts = ti.opts;
    const insertViews = ti.insertViews;
    const removeStart = ti.removeStart;
    const removeCount = ti.removeCount;
    let destroyQueue;
    // there are views to remove
    if (removeStart !== undefined && removeCount !== undefined) {
      helpers.assert(removeStart >= 0, 'removeStart can not be negative');
      helpers.assert(removeCount >= 0, 'removeCount can not be negative');
      destroyQueue = [];
      for (let i = 0; i < removeCount; i++) {
        const view = this.views[i + removeStart];
        if (view && view !== enteringView && view !== leavingView) {
          destroyQueue.push(view);
        }
      }
      // default the direction to "back"
      opts.direction = opts.direction || 'back';
    }
    const finalBalance = this.views.length +
      (insertViews !== undefined ? insertViews.length : 0) -
      (removeCount !== undefined ? removeCount : 0);
    helpers.assert(finalBalance >= 0, 'final balance can not be negative');
    if (finalBalance === 0) {
      console.warn(`You can't remove all the pages in the navigation stack. nav.pop() is probably called too many times.`, this, this.el);
      throw new Error('navigation stack needs at least one root page');
    }
    // At this point the transition can not be rejected, any throw should be an error
    // there are views to insert
    if (insertViews) {
      // add the views to the
      let insertIndex = ti.insertStart;
      for (const view of insertViews) {
        this.insertViewAt(view, insertIndex);
        insertIndex++;
      }
      if (ti.enteringRequiresTransition) {
        // default to forward if not already set
        opts.direction = opts.direction || 'forward';
      }
    }
    // if the views to be removed are in the beginning or middle
    // and there is not a view that needs to visually transition out
    // then just destroy them and don't transition anything
    // batch all of lifecycles together
    // let's make sure, callbacks are zoned
    if (destroyQueue && destroyQueue.length > 0) {
      for (const view of destroyQueue) {
        index$1.lifecycle(view.element, index$1.LIFECYCLE_WILL_LEAVE);
        index$1.lifecycle(view.element, index$1.LIFECYCLE_DID_LEAVE);
        index$1.lifecycle(view.element, index$1.LIFECYCLE_WILL_UNLOAD);
      }
      // once all lifecycle events has been delivered, we can safely detroy the views
      for (const view of destroyQueue) {
        this.destroyView(view);
      }
    }
  }
  async transition(enteringView, leavingView, ti) {
    // we should animate (duration > 0) if the pushed page is not the first one (startup)
    // or if it is a portal (modal, actionsheet, etc.)
    const opts = ti.opts;
    const progressCallback = opts.progressAnimation
      ? (ani) => this.sbAni = ani
      : undefined;
    const mode = ionicGlobal.getIonMode(this);
    const enteringEl = enteringView.element;
    const leavingEl = leavingView && leavingView.element;
    const animationOpts = Object.assign(Object.assign({ mode, showGoBack: this.canGoBackSync(enteringView), baseEl: this.el, progressCallback, animated: this.animated && ionicGlobal.config.getBoolean('animated', true), enteringEl,
      leavingEl }, opts), { animationBuilder: opts.animationBuilder || this.animation || ionicGlobal.config.get('navAnimation') });
    const { hasCompleted } = await index$1.transition(animationOpts);
    return this.transitionFinish(hasCompleted, enteringView, leavingView, opts);
  }
  transitionFinish(hasCompleted, enteringView, leavingView, opts) {
    const cleanupView = hasCompleted ? enteringView : leavingView;
    if (cleanupView) {
      this.cleanup(cleanupView);
    }
    return {
      hasCompleted,
      requiresTransition: true,
      enteringView,
      leavingView,
      direction: opts.direction
    };
  }
  insertViewAt(view, index) {
    const views = this.views;
    const existingIndex = views.indexOf(view);
    if (existingIndex > -1) {
      // this view is already in the stack!!
      // move it to its new location
      helpers.assert(view.nav === this, 'view is not part of the nav');
      views.splice(index, 0, views.splice(existingIndex, 1)[0]);
    }
    else {
      helpers.assert(!view.nav, 'nav is used');
      // this is a new view to add to the stack
      // create the new entering view
      view.nav = this;
      // insert the entering view into the correct index in the stack
      views.splice(index, 0, view);
    }
  }
  removeView(view) {
    helpers.assert(view.state === VIEW_STATE_ATTACHED || view.state === VIEW_STATE_DESTROYED, 'view state should be loaded or destroyed');
    const views = this.views;
    const index = views.indexOf(view);
    helpers.assert(index > -1, 'view must be part of the stack');
    if (index >= 0) {
      views.splice(index, 1);
    }
  }
  destroyView(view) {
    view._destroy();
    this.removeView(view);
  }
  /**
   * DOM WRITE
   */
  cleanup(activeView) {
    // ok, cleanup time!! Destroy all of the views that are
    // INACTIVE and come after the active view
    // only do this if the views exist, though
    if (this.destroyed) {
      return;
    }
    const views = this.views;
    const activeViewIndex = views.indexOf(activeView);
    for (let i = views.length - 1; i >= 0; i--) {
      const view = views[i];
      /**
       * When inserting multiple views via insertPages
       * the last page will be transitioned to, but the
       * others will not be. As a result, a DOM element
       * will only be created for the last page inserted.
       * As a result, it is possible to have views in the
       * stack that do not have `view.element` yet.
       */
      const element = view.element;
      if (element) {
        if (i > activeViewIndex) {
          // this view comes after the active view
          // let's unload it
          index$1.lifecycle(element, index$1.LIFECYCLE_WILL_UNLOAD);
          this.destroyView(view);
        }
        else if (i < activeViewIndex) {
          // this view comes before the active view
          // and it is not a portal then ensure it is hidden
          index$1.setPageHidden(element, true);
        }
      }
    }
  }
  canStart() {
    return (!!this.swipeGesture &&
      !this.isTransitioning &&
      this.transInstr.length === 0 &&
      this.animationEnabled &&
      this.canGoBackSync());
  }
  onStart() {
    this.queueTrns({
      removeStart: -1,
      removeCount: 1,
      opts: {
        direction: 'back',
        progressAnimation: true
      }
    }, undefined);
  }
  onMove(stepValue) {
    if (this.sbAni) {
      this.sbAni.progressStep(stepValue);
    }
  }
  onEnd(shouldComplete, stepValue, dur) {
    if (this.sbAni) {
      this.animationEnabled = false;
      this.sbAni.onFinish(() => {
        this.animationEnabled = true;
      }, { oneTimeCallback: true });
      // Account for rounding errors in JS
      let newStepValue = (shouldComplete) ? -0.001 : 0.001;
      /**
       * Animation will be reversed here, so need to
       * reverse the easing curve as well
       *
       * Additionally, we need to account for the time relative
       * to the new easing curve, as `stepValue` is going to be given
       * in terms of a linear curve.
       */
      if (!shouldComplete) {
        this.sbAni.easing('cubic-bezier(1, 0, 0.68, 0.28)');
        newStepValue += cubicBezier.getTimeGivenProgression([0, 0], [1, 0], [0.68, 0.28], [1, 1], stepValue)[0];
      }
      else {
        newStepValue += cubicBezier.getTimeGivenProgression([0, 0], [0.32, 0.72], [0, 1], [1, 1], stepValue)[0];
      }
      this.sbAni.progressEnd(shouldComplete ? 1 : 0, newStepValue, dur);
    }
  }
  render() {
    return (index.h("slot", null));
  }
  get el() { return index.getElement(this); }
  static get watchers() { return {
    "swipeGesture": ["swipeGestureChanged"],
    "root": ["rootChanged"]
  }; }
};
Nav.style = navCss;

const navLink = (el, routerDirection, component, componentProps, routerAnimation) => {
  const nav = el.closest('ion-nav');
  if (nav) {
    if (routerDirection === 'forward') {
      if (component !== undefined) {
        return nav.push(component, componentProps, { skipIfBusy: true, animationBuilder: routerAnimation });
      }
    }
    else if (routerDirection === 'root') {
      if (component !== undefined) {
        return nav.setRoot(component, componentProps, { skipIfBusy: true, animationBuilder: routerAnimation });
      }
    }
    else if (routerDirection === 'back') {
      return nav.pop({ skipIfBusy: true, animationBuilder: routerAnimation });
    }
  }
  return Promise.resolve(false);
};

const NavLink = class {
  constructor(hostRef) {
    index.registerInstance(this, hostRef);
    /**
     * The transition direction when navigating to another page.
     */
    this.routerDirection = 'forward';
    this.onClick = () => {
      return navLink(this.el, this.routerDirection, this.component, this.componentProps, this.routerAnimation);
    };
  }
  render() {
    return (index.h(index.Host, { onClick: this.onClick }));
  }
  get el() { return index.getElement(this); }
};

exports.ion_nav = Nav;
exports.ion_nav_link = NavLink;