@ionic/core/components/ion-reorder-group.js

/*!
 * (C) Ionic http://ionicframework.com - MIT License
 */
import { proxyCustomElement, HTMLElement, createEvent, h, Host } from '@stencil/core/internal/client';
import { b as getIonMode } from './ionic-global.js';
import { c as componentOnReady } from './helpers.js';
import { a as hapticSelectionStart, b as hapticSelectionChanged, h as hapticSelectionEnd } from './haptic.js';

const reorderGroupCss = ".reorder-list-active>*{-webkit-transition:-webkit-transform 300ms;transition:-webkit-transform 300ms;transition:transform 300ms;transition:transform 300ms, -webkit-transform 300ms;will-change:transform}.reorder-enabled{-webkit-user-select:none;-moz-user-select:none;-ms-user-select:none;user-select:none}.reorder-enabled ion-reorder{display:block;cursor:-webkit-grab;cursor:grab;pointer-events:all;-ms-touch-action:none;touch-action:none}.reorder-selected,.reorder-selected ion-reorder{cursor:-webkit-grabbing;cursor:grabbing}.reorder-selected{position:relative;-webkit-transition:none !important;transition:none !important;-webkit-box-shadow:0 0 10px rgba(0, 0, 0, 0.4);box-shadow:0 0 10px rgba(0, 0, 0, 0.4);opacity:0.8;z-index:100}.reorder-visible ion-reorder .reorder-icon{-webkit-transform:translate3d(0,  0,  0);transform:translate3d(0,  0,  0)}";

const ReorderGroup = /*@__PURE__*/ proxyCustomElement(class extends HTMLElement {
  constructor() {
    super();
    this.__registerHost();
    this.ionItemReorder = createEvent(this, "ionItemReorder", 7);
    this.lastToIndex = -1;
    this.cachedHeights = [];
    this.scrollElTop = 0;
    this.scrollElBottom = 0;
    this.scrollElInitial = 0;
    this.containerTop = 0;
    this.containerBottom = 0;
    this.state = 0 /* Idle */;
    /**
     * If `true`, the reorder will be hidden.
     */
    this.disabled = true;
  }
  disabledChanged() {
    if (this.gesture) {
      this.gesture.enable(!this.disabled);
    }
  }
  async connectedCallback() {
    const contentEl = this.el.closest('ion-content');
    if (contentEl) {
      await new Promise(resolve => componentOnReady(contentEl, resolve));
      this.scrollEl = await contentEl.getScrollElement();
    }
    this.gesture = (await import('./index2.js')).createGesture({
      el: this.el,
      gestureName: 'reorder',
      gesturePriority: 110,
      threshold: 0,
      direction: 'y',
      passive: false,
      canStart: detail => this.canStart(detail),
      onStart: ev => this.onStart(ev),
      onMove: ev => this.onMove(ev),
      onEnd: () => this.onEnd(),
    });
    this.disabledChanged();
  }
  disconnectedCallback() {
    this.onEnd();
    if (this.gesture) {
      this.gesture.destroy();
      this.gesture = undefined;
    }
  }
  /**
   * Completes the reorder operation. Must be called by the `ionItemReorder` event.
   *
   * If a list of items is passed, the list will be reordered and returned in the
   * proper order.
   *
   * If no parameters are passed or if `true` is passed in, the reorder will complete
   * and the item will remain in the position it was dragged to. If `false` is passed,
   * the reorder will complete and the item will bounce back to its original position.
   *
   * @param listOrReorder A list of items to be sorted and returned in the new order or a
   * boolean of whether or not the reorder should reposition the item.
   */
  complete(listOrReorder) {
    return Promise.resolve(this.completeSync(listOrReorder));
  }
  canStart(ev) {
    if (this.selectedItemEl || this.state !== 0 /* Idle */) {
      return false;
    }
    const target = ev.event.target;
    const reorderEl = target.closest('ion-reorder');
    if (!reorderEl) {
      return false;
    }
    const item = findReorderItem(reorderEl, this.el);
    if (!item) {
      return false;
    }
    ev.data = item;
    return true;
  }
  onStart(ev) {
    ev.event.preventDefault();
    const item = this.selectedItemEl = ev.data;
    const heights = this.cachedHeights;
    heights.length = 0;
    const el = this.el;
    const children = el.children;
    if (!children || children.length === 0) {
      return;
    }
    let sum = 0;
    for (let i = 0; i < children.length; i++) {
      const child = children[i];
      sum += child.offsetHeight;
      heights.push(sum);
      child.$ionIndex = i;
    }
    const box = el.getBoundingClientRect();
    this.containerTop = box.top;
    this.containerBottom = box.bottom;
    if (this.scrollEl) {
      const scrollBox = this.scrollEl.getBoundingClientRect();
      this.scrollElInitial = this.scrollEl.scrollTop;
      this.scrollElTop = scrollBox.top + AUTO_SCROLL_MARGIN;
      this.scrollElBottom = scrollBox.bottom - AUTO_SCROLL_MARGIN;
    }
    else {
      this.scrollElInitial = 0;
      this.scrollElTop = 0;
      this.scrollElBottom = 0;
    }
    this.lastToIndex = indexForItem(item);
    this.selectedItemHeight = item.offsetHeight;
    this.state = 1 /* Active */;
    item.classList.add(ITEM_REORDER_SELECTED);
    hapticSelectionStart();
  }
  onMove(ev) {
    const selectedItem = this.selectedItemEl;
    if (!selectedItem) {
      return;
    }
    // Scroll if we reach the scroll margins
    const scroll = this.autoscroll(ev.currentY);
    // // Get coordinate
    const top = this.containerTop - scroll;
    const bottom = this.containerBottom - scroll;
    const currentY = Math.max(top, Math.min(ev.currentY, bottom));
    const deltaY = scroll + currentY - ev.startY;
    const normalizedY = currentY - top;
    const toIndex = this.itemIndexForTop(normalizedY);
    if (toIndex !== this.lastToIndex) {
      const fromIndex = indexForItem(selectedItem);
      this.lastToIndex = toIndex;
      hapticSelectionChanged();
      this.reorderMove(fromIndex, toIndex);
    }
    // Update selected item position
    selectedItem.style.transform = `translateY(${deltaY}px)`;
  }
  onEnd() {
    const selectedItemEl = this.selectedItemEl;
    this.state = 2 /* Complete */;
    if (!selectedItemEl) {
      this.state = 0 /* Idle */;
      return;
    }
    const toIndex = this.lastToIndex;
    const fromIndex = indexForItem(selectedItemEl);
    if (toIndex === fromIndex) {
      this.completeSync();
    }
    else {
      this.ionItemReorder.emit({
        from: fromIndex,
        to: toIndex,
        complete: this.completeSync.bind(this)
      });
    }
    hapticSelectionEnd();
  }
  completeSync(listOrReorder) {
    const selectedItemEl = this.selectedItemEl;
    if (selectedItemEl && this.state === 2 /* Complete */) {
      const children = this.el.children;
      const len = children.length;
      const toIndex = this.lastToIndex;
      const fromIndex = indexForItem(selectedItemEl);
      if (toIndex !== fromIndex && (listOrReorder === undefined || listOrReorder === true)) {
        const ref = (fromIndex < toIndex)
          ? children[toIndex + 1]
          : children[toIndex];
        this.el.insertBefore(selectedItemEl, ref);
      }
      if (Array.isArray(listOrReorder)) {
        listOrReorder = reorderArray(listOrReorder, fromIndex, toIndex);
      }
      for (let i = 0; i < len; i++) {
        children[i].style['transform'] = '';
      }
      selectedItemEl.style.transition = '';
      selectedItemEl.classList.remove(ITEM_REORDER_SELECTED);
      this.selectedItemEl = undefined;
      this.state = 0 /* Idle */;
    }
    return listOrReorder;
  }
  itemIndexForTop(deltaY) {
    const heights = this.cachedHeights;
    // TODO: since heights is a sorted array of integers, we can do
    // speed up the search using binary search. Remember that linear-search is still
    // faster than binary-search for small arrays (<64) due CPU branch misprediction.
    for (let i = 0; i < heights.length; i++) {
      if (heights[i] > deltaY) {
        return i;
      }
    }
    return heights.length - 1;
  }
  /********* DOM WRITE ********* */
  reorderMove(fromIndex, toIndex) {
    const itemHeight = this.selectedItemHeight;
    const children = this.el.children;
    for (let i = 0; i < children.length; i++) {
      const style = children[i].style;
      let value = '';
      if (i > fromIndex && i <= toIndex) {
        value = `translateY(${-itemHeight}px)`;
      }
      else if (i < fromIndex && i >= toIndex) {
        value = `translateY(${itemHeight}px)`;
      }
      style['transform'] = value;
    }
  }
  autoscroll(posY) {
    if (!this.scrollEl) {
      return 0;
    }
    let amount = 0;
    if (posY < this.scrollElTop) {
      amount = -SCROLL_JUMP;
    }
    else if (posY > this.scrollElBottom) {
      amount = SCROLL_JUMP;
    }
    if (amount !== 0) {
      this.scrollEl.scrollBy(0, amount);
    }
    return this.scrollEl.scrollTop - this.scrollElInitial;
  }
  render() {
    const mode = getIonMode(this);
    return (h(Host, { class: {
        [mode]: true,
        'reorder-enabled': !this.disabled,
        'reorder-list-active': this.state !== 0 /* Idle */,
      } }));
  }
  get el() { return this; }
  static get watchers() { return {
    "disabled": ["disabledChanged"]
  }; }
  static get style() { return reorderGroupCss; }
}, [0, "ion-reorder-group", {
    "disabled": [4],
    "state": [32],
    "complete": [64]
  }]);
const indexForItem = (element) => {
  return element['$ionIndex'];
};
const findReorderItem = (node, container) => {
  let parent;
  while (node) {
    parent = node.parentElement;
    if (parent === container) {
      return node;
    }
    node = parent;
  }
  return undefined;
};
const AUTO_SCROLL_MARGIN = 60;
const SCROLL_JUMP = 10;
const ITEM_REORDER_SELECTED = 'reorder-selected';
const reorderArray = (array, from, to) => {
  const element = array[from];
  array.splice(from, 1);
  array.splice(to, 0, element);
  return array.slice();
};
function defineCustomElement$1() {
  if (typeof customElements === "undefined") {
    return;
  }
  const components = ["ion-reorder-group"];
  components.forEach(tagName => { switch (tagName) {
    case "ion-reorder-group":
      if (!customElements.get(tagName)) {
        customElements.define(tagName, ReorderGroup);
      }
      break;
  } });
}

const IonReorderGroup = ReorderGroup;
const defineCustomElement = defineCustomElement$1;

export { IonReorderGroup, defineCustomElement };