Collapse panel

components.collapsible-panels.collapsible-panel-body.js

import Component from '@ember/component';

export default Component.extend({
  classNames: ['panel-body'],
  classNameBindings: ['isOpen:is-open']
});

components.collapsible-panels.collapsible-panel-header.js

import Component from '@ember/component';
import { inject as service } from '@ember/service';

export default Component.extend({
  panelActionsService: service('panel-actions'),
  group: null,
  disabled: false,
  classNames: ['panel-header'],
  toggleAllPanels: false,
  actions: {
    expandAllPanels() {
      if (this.get("disabled")) {
        return;
      }
      this.get('panelActionsService').openAllPanels(this.get('group'));
    },
    collapseAllPanels() {
      if (this.get("disabled")) {
        return;
      }
      this.get('panelActionsService').closeAllPanels(this.get('group'));
    }
  }
});

components.collapsible-panels.collapsible-panel-toggle.js

import Component from '@ember/component';

export default Component.extend({
  classNames: ['panel-toggle', 'u-cursor-pointer'],
  classNameBindings: ['isOpen:is-open'],

  click(e) {
    e.preventDefault();
    this.get('onClick')();
  }
});

components.collapsible-panels.collapsible-panel.js

import EmberObject, { computed } from '@ember/object';
import { reads, not }  from '@ember/object/computed';
import Component from '@ember/component';
import { inject as service } from '@ember/service';
import { run } from '@ember/runloop';

export default Component.extend({
  classNames: ['panel'],
  classNameBindings: ['isOpen:is-open:is-closed', 'disabled:is-disabled'],
  panelActionsService: service('panel-actions'),
  panelId: null,
  disabled: false,
  panelState: computed('panelActionsService.panels.[]', 'panelId', {
    get() {
      let panelActionsService = this.get('panelActionsService');
      let currentPanel = panelActionsService.getPanelById(this.get('panelId'));
      return currentPanel;
    }
  }),
  isOpen: reads('panelState.isOpen'),
  isClosed: not('isOpen'),
  init() {
    this._super(...arguments);
    run.next(() => {
      let panels = this.get('panelActionsService.panels');
      panels.addObject(EmberObject.create({
        id: this.get('panelId'),
        isOpen: true,
        group: this.get('group')
      }));
    });
  },
  actions: {
    toggleIsOpen() {
      if (this.get("disabled")) {
        return;
      }
      this.get('panelActionsService').togglePanel(this.get('panelId'));
    }
  }
});

components.collapsible-panels.js

import Component from '@ember/component';
import { computed } from '@ember/object';
import { inject as service } from '@ember/service';

export default Component.extend({
  panelActionsService: service('panel-actions'),
  classNames: ['panels'],
  group: null,
  canExpandAllPanels:computed('panelActionsService.panels.@each.isOpen', {
    get() {
      return this.get('panelActionsService.panels').isEvery('isOpen', false);
    }
  })
});

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName: 'Ember Twiddle',
  reports: [{
  	"id": 1,
    "name": "Report 1",
    "pages":[{
    	"id": "11",
      "name": "Page 1"
    }, {
    	"id": "12",
      "name": "Page 2"
    }]
  }, {
  	"id": 2,
    "name": "Report 2",
    "pages":[{
    	"id": "13",
      "name": "Page 3 - Report 2"
    }]
  }]
});

services.panel-actions.js

import Service from '@ember/service';
import { A } from '@ember/array';

export default Service.extend({
  panels: A(),
  getPanelById(panelId) {
    return this.get('panels').findBy('id', panelId);
  },
  getPanelsForGroup(group) {
    return this.get('panels').filterBy('group', group);
  },
  togglePanel(panelId) {
    let panel = this.getPanelById(panelId);
    panel.toggleProperty('isOpen');
  },
  openAllPanels(group) {
    let panels = this.getPanelsForGroup(group);
    panels.forEach((panel) => {
      panel.set('isOpen', true);
    });
  },
  closeAllPanels(group) {
    let panels = this.getPanelsForGroup(group);
    panels.forEach((panel) => {
      panel.set('isOpen', false);
    });
  }
});

styles.app.css

body {
  margin: 12px 16px;
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  font-size: 12pt;
}
.panel {
  margin-bottom: 5px;
}

.panel-toggle {
  .u-vertically-centered-container;
  width: 100%;
  padding: 5px;
  border-radius: 4px;
  background-color: green;
  font-size: 14px;
  font-weight: bold;
  &::before {
    content: '';
    background-image: url(svgs/chevron-right.svg);
    width: 17px;
    height: 17px;
    background-size: 17px 17px;
  }
}

.panel-toggle.is-open {
  &::before {
    background-image: url(svgs/chevron-down.svg);
  }
}

.panel-body {
  &.is-open {
    padding: 10px 5px 5px;
  }
  .field:last-of-type {
    margin-bottom: 0px;
  }
}

.navigation-pane_reports_panel {
  margin-right: 20px;
  .panel {
    margin-bottom: 10px;
  }
  .panel.is-open {
    margin-bottom: 0;
  }
  .panel-toggle {
    padding: 0 0 0 5px;
  }
  .panel-body.is-open {
    padding: 5px 0;
  }
}

templates.application.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>
{{outlet}}
<br>
{{#collapsible-panels class="navigation-pane_reports_panel" group="reports-sidebar" as |panels|}}
      {{#panels.header toggleAllPanels=true as |header|}}{{/panels.header}}
      {{#each reports as |report|}}
        {{#panels.panel panelId=report.id as |panel|}}
          {{#panel.toggle}}
            <div class="navigation-pane_reports_panel_header">
              <div class="navigation-pane_reports_panel_header_title">
                {{report.name}}
              </div>
            </div>
          {{/panel.toggle}}
          {{#panel.body}}
            {{#each report.pages as |page|}}
              <div>{{page.name}}</div>
            {{/each}}
          {{/panel.body}}
        {{/panels.panel}}
      {{/each}}
    {{/collapsible-panels}}
<br>

templates.components.collapsible-panels.collapsible-panel-body.hbs

{{#if isOpen}}
  <div class="panel-body">
    {{yield}}
  </div>
{{/if}}

templates.components.collapsible-panels.collapsible-panel-header.hbs

{{yield}}
{{#if toggleAllPanels}}
  <div>
    {{#if canExpandAllPanels}}
      <div class="" {{action "expandAllPanels"}} role="button"> <h3>expand-all</h3></div>
    {{else}}
      <div class="" {{action "collapseAllPanels"}} role="button"><h3>Collapse All</h3></div>
    {{/if}}
  </div>
{{/if}}

templates.components.collapsible-panels.collapsible-panel-toggle.hbs

{{yield}}

templates.components.collapsible-panels.collapsible-panel.hbs

{{yield (hash
  toggle=(component 'collapsible-panels/collapsible-panel-toggle' onClick=(action 'toggleIsOpen') isOpen=isOpen)
  body=(component 'collapsible-panels/collapsible-panel-body' isOpen=isOpen)
  isOpen=isOpen
)}}

templates.components.collapsible-panels.hbs

{{yield (hash header=(component 'collapsible-panels/collapsible-panel-header' group=group   canExpandAllPanels=canExpandAllPanels) panel=(component 'collapsible-panels/collapsible-panel' group=group))}}

twiddle.json

{
  "version": "0.15.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.js",
    "ember": "3.4.3",
    "ember-template-compiler": "3.4.3",
    "ember-testing": "3.4.3"
  },
  "addons": {
    "ember-data": "3.4.2"
  }
}