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/**
 * @file
 * A Backbone View that provides the visual view of a contextual link.
 */

(function (Drupal, Backbone) {
  /**
   * @deprecated in drupal:9.4.0 and is removed from drupal:12.0.0. There is no
   *  replacement.
   */
  Drupal.contextual.VisualView = Backbone.View.extend(
    /** @lends Drupal.contextual.VisualView# */ {
      /**
       * Events for the Backbone view.
       *
       * @return {object}
       *   A mapping of events to be used in the view.
       */
      events() {
        // Prevents delay and simulated mouse events.
        const touchEndToClick = function (event) {
          event.preventDefault();
          event.target.click();
        };

        // Used for tracking the presence of touch events. When true, the
        // mousemove and mouseenter event handlers are effectively disabled.
        // This is used instead of preventDefault() on touchstart as some
        // touchstart events are not cancelable.
        let touchStart = false;

        return {
          touchstart() {
            // Set to true so the mouseenter events that follows knows to not
            // execute any hover related logic.
            touchStart = true;
          },
          mouseenter() {
            // We only want mouse hover events on non-touch.
            if (!touchStart) {
              this.model.focus();
            }
          },
          mousemove() {
            // Because there are scenarios where there are both touchscreens
            // and pointer devices, the touchStart flag should be set back to
            // false after mouseenter and mouseleave complete. It will be set to
            // true if another touchstart event occurs.
            touchStart = false;
          },
          'click .trigger': function () {
            this.model.toggleOpen();
          },
          'touchend .trigger': touchEndToClick,
          'click .contextual-links a': function () {
            this.model.close().blur();
          },
          'touchend .contextual-links a': touchEndToClick,
        };
      },

      /**
       * Renders the visual view of a contextual link. Listens to mouse & touch.
       *
       * @constructs
       *
       * @augments Backbone.View
       */
      initialize() {
        this.listenTo(this.model, 'change', this.render);
      },

      /**
       * {@inheritdoc}
       *
       * @return {Drupal.contextual.VisualView}
       *   The current contextual visual view.
       */
      render() {
        const isOpen = this.model.get('isOpen');
        // The trigger should be visible when:
        //  - the mouse hovered over the region,
        //  - the trigger is locked,
        //  - and for as long as the contextual menu is open.
        const isVisible =
          this.model.get('isLocked') ||
          this.model.get('regionIsHovered') ||
          isOpen;

        this.$el
          // The open state determines if the links are visible.
          .toggleClass('open', isOpen)
          // Update the visibility of the trigger.
          .find('.trigger')
          .toggleClass('visually-hidden', !isVisible);

        // Nested contextual region handling: hide any nested contextual triggers.
        if ('isOpen' in this.model.changed) {
          this.$el
            .closest('.contextual-region')
            .find('.contextual .trigger:not(:first)')
            .toggle(!isOpen);
        }

        return this;
      },
    },
  );
})(Drupal, Backbone);