text: import { r as registerInstance, c as createEvent, w as writeTask, f as readTask, d as getIonMode, h, e as getElement, H as Host } from './chunk-d0403a2f.js';
  import { b as config } from './chunk-1074393c.js';
  import { s as sanitizeDOMString } from './chunk-cae2ca23.js';
  
  class InfiniteScroll {
      constructor(hostRef) {
          registerInstance(this, hostRef);
          this.thrPx = 0;
          this.thrPc = 0;
          this.didFire = false;
          this.isBusy = false;
          this.isLoading = false;
          /**
           * The threshold distance from the bottom
           * of the content to call the `infinite` output event when scrolled.
           * The threshold value can be either a percent, or
           * in pixels. For example, use the value of `10%` for the `infinite`
           * output event to get called when the user has scrolled 10%
           * from the bottom of the page. Use the value `100px` when the
           * scroll is within 100 pixels from the bottom of the page.
           */
          this.threshold = '15%';
          /**
           * If `true`, the infinite scroll will be hidden and scroll event listeners
           * will be removed.
           *
           * Set this to true to disable the infinite scroll from actively
           * trying to receive new data while scrolling. This is useful
           * when it is known that there is no more data that can be added, and
           * the infinite scroll is no longer needed.
           */
          this.disabled = false;
          /**
           * The position of the infinite scroll element.
           * The value can be either `top` or `bottom`.
           */
          this.position = 'bottom';
          this.onScroll = () => {
              const scrollEl = this.scrollEl;
              if (!scrollEl || !this.canStart()) {
                  return 1;
              }
              const infiniteHeight = this.el.offsetHeight;
              if (infiniteHeight === 0) {
                  // if there is no height of this element then do nothing
                  return 2;
              }
              const scrollTop = scrollEl.scrollTop;
              const scrollHeight = scrollEl.scrollHeight;
              const height = scrollEl.offsetHeight;
              const threshold = this.thrPc !== 0 ? (height * this.thrPc) : this.thrPx;
              const distanceFromInfinite = (this.position === 'bottom')
                  ? scrollHeight - infiniteHeight - scrollTop - threshold - height
                  : scrollTop - infiniteHeight - threshold;
              if (distanceFromInfinite < 0) {
                  if (!this.didFire) {
                      this.isLoading = true;
                      this.didFire = true;
                      this.ionInfinite.emit();
                      return 3;
                  }
              }
              else {
                  this.didFire = false;
              }
              return 4;
          };
          this.ionInfinite = createEvent(this, "ionInfinite", 7);
      }
      thresholdChanged() {
          const val = this.threshold;
          if (val.lastIndexOf('%') > -1) {
              this.thrPx = 0;
              this.thrPc = (parseFloat(val) / 100);
          }
          else {
              this.thrPx = parseFloat(val);
              this.thrPc = 0;
          }
      }
      disabledChanged() {
          const disabled = this.disabled;
          if (disabled) {
              this.isLoading = false;
              this.isBusy = false;
          }
          this.enableScrollEvents(!disabled);
      }
      async componentDidLoad() {
          const contentEl = this.el.closest('ion-content');
          if (contentEl) {
              this.scrollEl = await contentEl.getScrollElement();
          }
          this.thresholdChanged();
          this.disabledChanged();
          if (this.position === 'top') {
              writeTask(() => {
                  if (this.scrollEl) {
                      this.scrollEl.scrollTop = this.scrollEl.scrollHeight - this.scrollEl.clientHeight;
                  }
              });
          }
      }
      componentDidUnload() {
          this.enableScrollEvents(false);
          this.scrollEl = undefined;
      }
      /**
       * Call `complete()` within the `ionInfinite` output event handler when
       * your async operation has completed. For example, the `loading`
       * state is while the app is performing an asynchronous operation,
       * such as receiving more data from an AJAX request to add more items
       * to a data list. Once the data has been received and UI updated, you
       * then call this method to signify that the loading has completed.
       * This method will change the infinite scroll's state from `loading`
       * to `enabled`.
       */
      async complete() {
          const scrollEl = this.scrollEl;
          if (!this.isLoading || !scrollEl) {
              return;
          }
          this.isLoading = false;
          if (this.position === 'top') {
              /**
               * New content is being added at the top, but the scrollTop position stays the same,
               * which causes a scroll jump visually. This algorithm makes sure to prevent this.
               * (Frame 1)
               *    - complete() is called, but the UI hasn't had time to update yet.
               *    - Save the current content dimensions.
               *    - Wait for the next frame using _dom.read, so the UI will be updated.
               * (Frame 2)
               *    - Read the new content dimensions.
               *    - Calculate the height difference and the new scroll position.
               *    - Delay the scroll position change until other possible dom reads are done using _dom.write to be performant.
               * (Still frame 2, if I'm correct)
               *    - Change the scroll position (= visually maintain the scroll position).
               *    - Change the state to re-enable the InfiniteScroll.
               *    - This should be after changing the scroll position, or it could
               *    cause the InfiniteScroll to be triggered again immediately.
               * (Frame 3)
               *    Done.
               */
              this.isBusy = true;
              // ******** DOM READ ****************
              // Save the current content dimensions before the UI updates
              const prev = scrollEl.scrollHeight - scrollEl.scrollTop;
              // ******** DOM READ ****************
              requestAnimationFrame(() => {
                  readTask(() => {
                      // UI has updated, save the new content dimensions
                      const scrollHeight = scrollEl.scrollHeight;
                      // New content was added on top, so the scroll position should be changed immediately to prevent it from jumping around
                      const newScrollTop = scrollHeight - prev;
                      // ******** DOM WRITE ****************
                      requestAnimationFrame(() => {
                          writeTask(() => {
                              scrollEl.scrollTop = newScrollTop;
                              this.isBusy = false;
                          });
                      });
                  });
              });
          }
      }
      canStart() {
          return (!this.disabled &&
              !this.isBusy &&
              !!this.scrollEl &&
              !this.isLoading);
      }
      enableScrollEvents(shouldListen) {
          if (this.scrollEl) {
              if (shouldListen) {
                  this.scrollEl.addEventListener('scroll', this.onScroll);
              }
              else {
                  this.scrollEl.removeEventListener('scroll', this.onScroll);
              }
          }
      }
      render() {
          const mode = getIonMode(this);
          const disabled = this.disabled;
          return (h(Host, { class: {
                  [mode]: true,
                  'infinite-scroll-loading': this.isLoading,
                  'infinite-scroll-enabled': !disabled
              } }));
      }
      get el() { return getElement(this); }
      static get watchers() { return {
          "threshold": ["thresholdChanged"],
          "disabled": ["disabledChanged"]
      }; }
      static get style() { return "ion-infinite-scroll{display:none;width:100%}.infinite-scroll-enabled{display:block}"; }
  }
  
  class InfiniteScrollContent {
      constructor(hostRef) {
          registerInstance(this, hostRef);
      }
      componentDidLoad() {
          if (this.loadingSpinner === undefined) {
              const mode = getIonMode(this);
              this.loadingSpinner = config.get('infiniteLoadingSpinner', config.get('spinner', mode === 'ios' ? 'lines' : 'crescent'));
          }
      }
      render() {
          const mode = getIonMode(this);
          return (h(Host, { class: {
                  [mode]: true,
                  // Used internally for styling
                  [`infinite-scroll-content-${mode}`]: true
              } }, h("div", { class: "infinite-loading" }, this.loadingSpinner && (h("div", { class: "infinite-loading-spinner" }, h("ion-spinner", { name: this.loadingSpinner }))), this.loadingText && (h("div", { class: "infinite-loading-text", innerHTML: sanitizeDOMString(this.loadingText) })))));
      }
      static get style() { return "ion-infinite-scroll-content{display:-ms-flexbox;display:flex;-ms-flex-direction:column;flex-direction:column;-ms-flex-pack:center;justify-content:center;min-height:84px;text-align:center;-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}.infinite-loading{margin-left:0;margin-right:0;margin-top:0;margin-bottom:32px;display:none;width:100%}.infinite-loading-text{margin-left:32px;margin-right:32px;margin-top:4px;margin-bottom:0}\@supports ((-webkit-margin-start:0) or (margin-inline-start:0)) or (-webkit-margin-start:0){.infinite-loading-text{margin-left:unset;margin-right:unset;-webkit-margin-start:32px;margin-inline-start:32px;-webkit-margin-end:32px;margin-inline-end:32px}}.infinite-scroll-loading ion-infinite-scroll-content>.infinite-loading{display:block}.infinite-scroll-content-ios .infinite-loading-text{color:var(--ion-color-step-600,#666)}.infinite-scroll-content-ios .infinite-loading-spinner .spinner-crescent circle,.infinite-scroll-content-ios .infinite-loading-spinner .spinner-lines-ios line,.infinite-scroll-content-ios .infinite-loading-spinner .spinner-lines-small-ios line{stroke:var(--ion-color-step-600,#666)}.infinite-scroll-content-ios .infinite-loading-spinner .spinner-bubbles circle,.infinite-scroll-content-ios .infinite-loading-spinner .spinner-circles circle,.infinite-scroll-content-ios .infinite-loading-spinner .spinner-dots circle{fill:var(--ion-color-step-600,#666)}"; }
  }
  
  export { InfiniteScroll as ion_infinite_scroll, InfiniteScrollContent as ion_infinite_scroll_content };
  