package.src.vaadin-grid-selection-mixin.js Maven / Gradle / Ivy

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A free, flexible and high-quality Web Component for showing large amounts of tabular data

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/**
 * @license
 * Copyright (c) 2016 - 2023 Vaadin Ltd.
 * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
 */

/**
 * @polymerMixin
 */
export const SelectionMixin = (superClass) =>
  class SelectionMixin extends superClass {
    static get properties() {
      return {
        /**
         * An array that contains the selected items.
         * @type {!Array}
         */
        selectedItems: {
          type: Object,
          notify: true,
          value: () => [],
          sync: true,
        },

        /**
         * Set of selected item ids
         * @private
         */
        __selectedKeys: {
          type: Object,
          computed: '__computeSelectedKeys(itemIdPath, selectedItems)',
        },
      };
    }

    static get observers() {
      return ['__selectedItemsChanged(itemIdPath, selectedItems)'];
    }

    /**
     * @param {!GridItem} item
     * @return {boolean}
     * @protected
     */
    _isSelected(item) {
      return this.__selectedKeys.has(this.getItemId(item));
    }

    /**
     * Selects the given item.
     *
     * @method selectItem
     * @param {!GridItem} item The item object
     */
    selectItem(item) {
      if (!this._isSelected(item)) {
        this.selectedItems = [...this.selectedItems, item];
      }
    }

    /**
     * Deselects the given item if it is already selected.
     *
     * @method deselect
     * @param {!GridItem} item The item object
     */
    deselectItem(item) {
      if (this._isSelected(item)) {
        this.selectedItems = this.selectedItems.filter((i) => !this._itemsEqual(i, item));
      }
    }

    /**
     * Toggles the selected state of the given item.
     *
     * @method toggle
     * @param {!GridItem} item The item object
     * @protected
     */
    _toggleItem(item) {
      if (!this._isSelected(item)) {
        this.selectItem(item);
      } else {
        this.deselectItem(item);
      }
    }

    /** @private */
    __selectedItemsChanged() {
      this.requestContentUpdate();
    }

    /** @private */
    __computeSelectedKeys(itemIdPath, selectedItems) {
      const selected = selectedItems || [];
      const selectedKeys = new Set();
      selected.forEach((item) => {
        selectedKeys.add(this.getItemId(item));
      });

      return selectedKeys;
    }

    /**
     * Fired when the `selectedItems` property changes.
     *
     * @event selected-items-changed
     */
  };