[IMP] mail: introduce AttachmentViewer/onLoadImage

Task-2579306

Part-of: odoo/odoo#88152

addons/mail/static/src/components/attachment_viewer/attachment_viewer.js

@@ -397,20 +397,6 @@ export class AttachmentViewer extends Component {
         ev.stopPropagation();
     }
 
-    /**
-     * Called when new image has been loaded
-     *
-     * @private
-     * @param {Event} ev
-     */
-    _onLoadImage(ev) {
-        if (!this.attachmentViewer) {
-            return;
-        }
-        ev.stopPropagation();
-        this.attachmentViewer.update({ isImageLoading: false });
-    }
-
     /**
      * @private
      * @param {DragEvent} ev

addons/mail/static/src/components/attachment_viewer/attachment_viewer.xml

@@ -43,7 +43,7 @@
                                     <i class="fa fa-3x fa-circle-o-notch fa-fw fa-spin text-white" role="img" title="Loading"/>
                                 </div>
                             </t>
-                            <img class="o_AttachmentViewer_view o_AttachmentViewer_viewImage mw-100 mh-100 bg-black" t-on-click="attachmentViewer.onClickImage" t-on-mousedown="_onMousedownImage" t-on-wheel="_onWheelImage" t-on-load="_onLoadImage" t-att-src="attachmentViewer.imageUrl" t-att-style="attachmentViewer.imageStyle" draggable="false" alt="Viewer" t-key="'image_' + attachmentViewer.attachment.id" t-ref="image_{{ attachmentViewer.attachment.id }}"/>
+                            <img class="o_AttachmentViewer_view o_AttachmentViewer_viewImage mw-100 mh-100 bg-black" t-on-click="attachmentViewer.onClickImage" t-on-mousedown="_onMousedownImage" t-on-wheel="_onWheelImage" t-on-load="attachmentViewer.onLoadImage" t-att-src="attachmentViewer.imageUrl" t-att-style="attachmentViewer.imageStyle" draggable="false" alt="Viewer" t-key="'image_' + attachmentViewer.attachment.id" t-ref="image_{{ attachmentViewer.attachment.id }}"/>
                         </div>
                     </t>
                     <t t-if="attachmentViewer.attachment.isPdf">

addons/mail/static/src/models/attachment_viewer.js

@@ -82,6 +82,18 @@ registerModel({
         onClickVideo(ev) {
             ev.stopPropagation();
         },
+        /**
+         * Called when new image has been loaded
+         *
+         * @param {Event} ev
+         */
+        onLoadImage(ev) {
+            if (!this.exists()) {
+                return;
+            }
+            ev.stopPropagation();
+            this.update({ isImageLoading: false });
+        },
         /**
          * @private
          * @returns {string}