WYSWIYG: Allowed video/embed alignment controls

Required a lot of working around TinyMCE since it added a
preview/wrapper element in the editor which complicates things.
Added view new "fixes.js" file so large hacks to default TinyMCe
functionality are kept in one place.

resources/js/wysiwyg/config.js

@@ -13,6 +13,7 @@ import {getPlugin as getImagemanagerPlugin} from './plugins-imagemanager';
 import {getPlugin as getAboutPlugin} from './plugins-about';
 import {getPlugin as getDetailsPlugin} from './plugins-details';
 import {getPlugin as getTasklistPlugin} from './plugins-tasklist';
+import {handleEmbedAlignmentChanges} from './fixes';
 
 const styleFormats = [
     {title: 'Large Header', format: 'h2', preview: 'color: blue;'},
@@ -35,9 +36,9 @@ const styleFormats = [
 ];
 
 const formats = {
-    alignleft: {selector: 'p,h1,h2,h3,h4,h5,h6,td,th,div,ul,ol,li,table,img', classes: 'align-left'},
-    aligncenter: {selector: 'p,h1,h2,h3,h4,h5,h6,td,th,div,ul,ol,li,table,img', classes: 'align-center'},
-    alignright: {selector: 'p,h1,h2,h3,h4,h5,h6,td,th,div,ul,ol,li,table,img', classes: 'align-right'},
+    alignleft: {selector: 'p,h1,h2,h3,h4,h5,h6,td,th,div,ul,ol,li,table,img,iframe,video,span', classes: 'align-left'},
+    aligncenter: {selector: 'p,h1,h2,h3,h4,h5,h6,td,th,div,ul,ol,li,table,img,iframe,video,span', classes: 'align-center'},
+    alignright: {selector: 'p,h1,h2,h3,h4,h5,h6,td,th,div,ul,ol,li,table,img,iframe,video,span', classes: 'align-right'},
     calloutsuccess: {block: 'p', exact: true, attributes: {class: 'callout success'}},
     calloutinfo: {block: 'p', exact: true, attributes: {class: 'callout info'}},
     calloutwarning: {block: 'p', exact: true, attributes: {class: 'callout warning'}},
@@ -177,6 +178,8 @@ function getSetupCallback(options) {
             setupFilters(editor);
         });
 
+        handleEmbedAlignmentChanges(editor);
+
         // Custom handler hook
         window.$events.emitPublic(options.containerElement, 'editor-tinymce::setup', {editor});
 

resources/js/wysiwyg/fixes.js

@@ -0,0 +1,55 @@
+/**
+ * Handle alignment for embed (iframe/video) content.
+ * TinyMCE built-in handling doesn't work well for these when classes are used for
+ * alignment, since the editor wraps these elements in a non-editable preview span
+ * which looses tracking and setting of alignment options.
+ * Here we manually manage these properties and formatting events, by effectively
+ * syncing the alignment classes to the parent preview span.
+ * @param {Editor} editor
+ */
+export function handleEmbedAlignmentChanges(editor) {
+    function updateClassesForPreview(previewElem) {
+        const mediaTarget = previewElem.querySelector('iframe, video');
+        if (!mediaTarget) {
+            return;
+        }
+
+        const alignmentClasses = [...mediaTarget.classList.values()].filter(c => c.startsWith('align-'));
+        const previewAlignClasses = [...previewElem.classList.values()].filter(c => c.startsWith('align-'));
+        previewElem.classList.remove(...previewAlignClasses);
+        previewElem.classList.add(...alignmentClasses);
+    }
+
+    editor.on('SetContent', () => {
+        const previewElems = editor.dom.select('span.mce-preview-object');
+        for (const previewElem of previewElems) {
+            updateClassesForPreview(previewElem);
+        }
+    });
+
+    editor.on('FormatApply', event => {
+        const isAlignment = event.format.startsWith('align');
+        if (!event.node || !event.node.matches('.mce-preview-object')) {
+            return;
+        }
+
+        const realTarget = event.node.querySelector('iframe, video');
+        if (isAlignment && realTarget) {
+            const className = (editor.formatter.get(event.format)[0]?.classes || [])[0];
+            const toAdd = !realTarget.classList.contains(className);
+
+            const wrapperClasses = (event.node.getAttribute('data-mce-p-class') || '').split(' ');
+            const wrapperClassesFiltered = wrapperClasses.filter(c => !c.startsWith('align-'));
+            if (toAdd) {
+                wrapperClassesFiltered.push(className);
+            }
+
+            const classesToApply = wrapperClassesFiltered.join(' ');
+            event.node.setAttribute('data-mce-p-class', classesToApply);
+
+            realTarget.setAttribute('class', classesToApply);
+            editor.formatter.apply(event.format, {}, realTarget);
+            updateClassesForPreview(event.node);
+        }
+    });
+}

resources/sass/_content.scss

@@ -11,24 +11,24 @@
   .align-left {
     text-align: left;
   }
-  img.align-left, table.align-left {
+  img.align-left, table.align-left, iframe.align-left, video.align-left {
     float: left !important;
     margin: $-xs $-m $-m 0;
   }
   .align-right {
     text-align: right !important;
   }
-  img.align-right, table.align-right {
+  img.align-right, table.align-right, iframe.align-right, video.align-right {
     float: right !important;
     margin: $-xs 0 $-xs $-s;
   }
   .align-center {
     text-align: center;
   }
-  img.align-center {
+  img.align-center, video.align-center, iframe.align-center {
     display: block;
   }
-  img.align-center, table.align-center {
+  img.align-center, table.align-center, iframe.align-center, video.align-center {
     margin-left: auto;
     margin-right: auto;
   }

resources/sass/_tinymce.scss

@@ -72,6 +72,30 @@ body.page-content.mce-content-body  {
   overflow: hidden;
 }
 
+// Allow alignment to be reflected in media embed wrappers
+.page-content.mce-content-body .mce-preview-object.align-right {
+  float: right !important;
+  margin: $-xs 0 $-xs $-s;
+}
+
+.page-content.mce-content-body .mce-preview-object.align-left {
+  float: left !important;
+  margin: $-xs $-m $-m 0;
+}
+
+.page-content.mce-content-body .mce-preview-object.align-center {
+  display: block;
+  margin-left: auto;
+  margin-right: auto;
+}
+
+.page-content.mce-content-body .mce-preview-object iframe,
+.page-content.mce-content-body .mce-preview-object video {
+  display: block;
+  margin: 0 !important;
+  float: none !important;
+}
+
 /**
  * Dark Mode Overrides
  */