style(attestation): preview on side

app/assets/stylesheets/attestation_template_2_edit.scss

@@ -1,11 +1,17 @@
 @import "constants";
 
 #attestation-edit {
-  .attestation-schema {
+  .attestation-preview {
     width: 100%;
-    margin-top: 3em;
-    top: 3em;
-    position: sticky;
+
+    @media (min-width: 62em) {
+      height: 664px; // empirical height for an A4 ratio at this width
+    }
+
+    @media (max-width: 62em) {
+      // PDF height is approximately tied to width
+      height: calc(90vw * 29.7 / 21);
+    }
   }
 
   .tiptap {

app/assets/stylesheets/layouts.scss

@@ -57,7 +57,7 @@
   // scss-lint:disable VendorPrefix
   position: -webkit-sticky; // This is needed on Safari (tested on 12.1)
   // scss-lint:enable VendorPrefix
-  top: 0;
+  top: 1rem;
 }
 
 .sticky--bottom {

app/javascript/controllers/attestation_controller.ts

@@ -5,7 +5,8 @@ export class AttestationController extends ApplicationController {
   static targets = [
     'layoutToggle',
     'logoMarianneLabelFieldset',
-    'logoAttachmentFieldset'
+    'logoAttachmentFieldset',
+    'preview'
   ];
   static values = {
     logoAttachmentOfficialLabel: String,
@@ -15,6 +16,7 @@ export class AttestationController extends ApplicationController {
   declare readonly layoutToggleTarget: HTMLInputElement;
   declare readonly logoMarianneLabelFieldsetTarget: HTMLElement;
   declare readonly logoAttachmentFieldsetTarget: HTMLElement;
+  declare readonly previewTarget: HTMLIFrameElement;
 
   declare readonly logoAttachmentOfficialLabelValue: string;
   declare readonly logoAttachmentFreeLabelValue: string;
@@ -23,6 +25,11 @@ export class AttestationController extends ApplicationController {
     this.layoutToggleTarget.addEventListener('change', () => {
       this.update();
     });
+
+    this.on('turbo:submit-end', () => {
+      // eslint-disable-next-line no-self-assign
+      this.previewTarget.src = this.previewTarget.src; // reload the iframe
+    });
   }
 
   private get isStateLayout() {

app/views/administrateurs/attestation_template_v2s/edit.html.haml

@@ -11,7 +11,7 @@
     attestation_logo_attachment_official_label_value: AttestationTemplate.human_attribute_name(:logo_additional),
     attestation_logo_attachment_free_label_value: AttestationTemplate.human_attribute_name(:logo) } do |f|
 
-  #attestation-edit.fr-container.fr-mt-4w{ data: { controller: 'tiptap', tiptap_insert_after_tag_value: ' ' } }
+  #attestation-edit.fr-container.fr-my-4w{ data: { controller: 'tiptap', tiptap_insert_after_tag_value: ' ' } }
     .fr-mb-6w
       = render Dsfr::AlertComponent.new(state: :info, title: "Nouvel éditeur d’attestation", heading_level: 'h3') do |c|
         - c.with_body do
@@ -26,7 +26,7 @@
           = link_to("Suivez ce lien pour revenir aux attestations actuellement délivrées", edit_admin_procedure_attestation_template_path(@procedure))
 
     .fr-grid-row.fr-grid-row--gutters
-      .fr-col-12.fr-col-md-8
+      .fr-col-12.fr-col-lg-7
         %fieldset.fr-fieldset{ aria: { labelledby: 'edit-attestation' } }
           %legend.fr-fieldset__legend#edit-attestation
             %h1.fr-h2 Attestation
@@ -107,9 +107,15 @@
             = render Dsfr::InputComponent.new(form: f, attribute: :footer, input_type: :text_area, required: false, opts: { rows: 3, data: { controller: :textarea, textarea_max_rows_value: 3 } }) do |c|
               - c.with_hint { "Exemple: 20 avenue de Ségur, 75007 Paris" }
 
-      .fr-col-12.fr-col-md-4.fr-background-alt--blue-france
-        = image_tag("attestation-template-schema-official.jpg", class: "attestation-schema", alt: "Schéma d’une attestation au modèle de l’état")
-
+      #preview-column.fr-col-12.fr-col-lg-5.fr-background-alt--blue-france
+        .sticky--top.fr-px-1w
+          .flex.justify-between.align-center
+            %h2.fr-h4 Aperçu
+            %p= link_to 'Prévisualiser en taille réelle', admin_procedure_attestation_template_v2_path(@procedure, format: :pdf), class: 'fr-link', target: '_blank', rel: 'noopener'
+          %iframe.attestation-preview{ title: "Aperçu", src: admin_procedure_attestation_template_v2_path(@procedure, format: :pdf), data: { attestation_target: 'preview' } }
+          %p.fr-hint-text
+            L’aperçu est mis à jour automatiquement après chaque modification.
+            Pour générer un aperçu fidèle avec tous les champs et les dates, créez-vous un dossier et acceptez-le : l’aperçu l’utilisera.
 
   .padded-fixed-footer
     .fixed-footer
@@ -117,8 +123,6 @@
         .fr-grid-row
           .fr-col-12.fr-col-md-7
             %ul.fr-btns-group.fr-btns-group--inline-md
-              %li
-                = link_to 'Prévisualiser l’attestation PDF', admin_procedure_attestation_template_v2_path(@procedure, format: :pdf), class: 'fr-btn fr-btn', target: '_blank', rel: 'noopener'
               %li
                 = link_to admin_procedure_path(id: @procedure), class: 'fr-btn fr-btn--secondary' do
                   %span.fr-icon-arrow-go-back-line.fr-icon--sm.fr-mr-1v