Add @@translate route for creating and editing content translations

docs/how-to-guides/index.md

@@ -30,4 +30,5 @@ icons
 configure-plate-code-block-languages
 bind-metadata-fields-to-plate-text-blocks
 custom-content-types
+translate-content
 ```

docs/how-to-guides/translate-content.md

@@ -0,0 +1,65 @@
+---
+myst:
+  html_meta:
+    "description": "How to create a translation of a content item in Plone Aurora while reading the original side by side"
+    "property=og:description": "How to create a translation of a content item in Plone Aurora while reading the original side by side"
+    "property=og:title": "Translate content"
+    "keywords": "Plone Aurora, translate, translation, multilingual, babel"
+---
+
+# Translate content
+
+This guide shows you how to create a translation of a content item while reading the original side by side.
+
+## Requirements
+
+Your site must be multilingual.
+Install the `plone.app.multilingual` add-on, and configure at least two site languages in the {guilabel}`Language` control panel.
+The backend then provides one root folder per language, and Aurora places every translation in the folder of its language.
+
+## Open the translation view
+
+Open the translation view directly by URL.
+Append the path of the item to translate to `@@translate`, and pass the target language as a query parameter.
+
+```text
+https://example.com/@@translate/<path-to-item>?language=<language-code>
+```
+
+For example, to translate the English page at `/en/welcome` to German, open the following URL.
+
+```text
+https://example.com/@@translate/en/welcome?language=de
+```
+
+If a translation in the target language already exists, the view redirects to the edit view of that translation.
+
+```{todo}
+Describe the user interface entry point for the translation view, once the toolbar provides a {guilabel}`Translate` action.
+See [issue 21](https://github.com/plone/aurora/issues/21) and [issue 31](https://github.com/plone/aurora/issues/31).
+```
+
+## Translate the content
+
+The view shows the original on the left, and the new translation on the right.
+The {guilabel}`Blocks` and {guilabel}`Content` tabs switch both columns at the same time.
+
+In the {guilabel}`Blocks` tab, the left column shows the rendered original, and the right column shows the block editor for the translation.
+The translation starts with the same block structure as the original.
+
+-   Text blocks contain the original text.
+    Overwrite it with your translation.
+-   All other blocks, such as a teaser, appear empty at their original position.
+    Fill them as you would fill a manually added block.
+
+In the {guilabel}`Content` tab, the left column shows the field values of the original, and the right column shows the fields of the translation.
+The fields start empty and show the values of the original as placeholders.
+Enter the translated values, starting with the {guilabel}`Title`.
+
+## Save the translation
+
+Select the {guilabel}`Save` button in the toolbar.
+Aurora creates the translation in the root folder of the target language, links it to the original, and opens the edit view of the new translation.
+
+Fields that you leave empty stay empty on the translation.
+The link between the original and the translation lets visitors switch between the two language versions of the item.

packages/cmsui/components/ContentForm/ContentForm.tsx

@@ -40,13 +40,19 @@ interface ContentFormProps {
   schema: Schema;
   heading: ReactNode;
   submitMethod: 'post' | 'patch';
+  /** Per-tab sticky panels rendered left of the form (eg. translation source). */
+  asidePanels?: { header?: ReactNode; blocks?: ReactNode; content?: ReactNode };
+  /** Placeholder text per field name (eg. the source values of a translation). */
+  fieldPlaceholders?: Record<string, string>;
 }
 
 export default function ContentForm({
   content,
   schema,
   heading,
   submitMethod,
+  asidePanels,
+  fieldPlaceholders,
 }: ContentFormProps) {
   const { t } = useTranslation();
   const fetcher = useFetcher();
@@ -64,6 +70,68 @@ export default function ContentForm({
     },
   });
 
+  const fieldsetsForm = (
+    <form>
+      {schema.fieldsets.map((fieldset) => (
+        <Accordion defaultExpandedKeys={['default']} key={fieldset.id}>
+          <AccordionItem id={fieldset.id} key={fieldset.id}>
+            <AccordionItemTrigger>{fieldset.title}</AccordionItemTrigger>
+            <AccordionPanel>
+              {(fieldset.fields as DeepKeys<Content>[]).map(
+                (schemaField, index) => (
+                  <form.AppField
+                    name={schemaField}
+                    key={index}
+                    // eslint-disable-next-line react/no-children-prop
+                    children={(field) => (
+                      <field.Quanta
+                        {...schema.properties[schemaField]}
+                        className="mb-4"
+                        label={schema.properties[field.name].title}
+                        name={field.name}
+                        defaultValue={field.state.value}
+                        required={schema.required.indexOf(schemaField) !== -1}
+                        error={field.state.meta.errors}
+                        formAtom={formAtom}
+                        value={field.state.value}
+                        {...(fieldPlaceholders?.[field.name]
+                          ? { placeholder: fieldPlaceholders[field.name] }
+                          : {})}
+                      />
+                    )}
+                  />
+                ),
+              )}
+            </AccordionPanel>
+          </AccordionItem>
+        </Accordion>
+      ))}
+    </form>
+  );
+
+  // The shared header row keeps both columns starting level; px-6 mirrors the
+  // blocks editor's own gutters, padBody pads bodies that lack them.
+  const withAside = (panel: ReactNode, body: ReactNode, padBody = false) =>
+    asidePanels ? (
+      <div
+        className={`
+          grid grid-cols-1 gap-x-8 pt-4
+          lg:grid-cols-2 lg:grid-rows-[auto_1fr]
+        `}
+      >
+        <div className="mb-4 self-end px-6">{asidePanels.header}</div>
+        <h1 className="mb-4 self-end px-6 text-2xl font-bold">{heading}</h1>
+        <aside className="sticky top-0 max-h-screen self-start overflow-y-auto px-6">
+          {panel}
+        </aside>
+        <div className={padBody ? 'flex flex-col px-6' : 'flex flex-col'}>
+          {body}
+        </div>
+      </div>
+    ) : (
+      body
+    );
+
   return (
     <Provider store={store}>
       <InitAtoms atomValues={[[formAtom, content]]}>
@@ -86,59 +154,22 @@ export default function ContentForm({
                 {
                   id: 'blocks',
                   title: t('cmsui.blocksEditor.blocksTab'),
-                  content: <BlocksEditor />,
+                  content: withAside(asidePanels?.blocks, <BlocksEditor />),
                 },
                 {
                   id: 'content',
                   title: t('cmsui.blocksEditor.contentTab'),
-                  content: (
-                    <div className="flex flex-col">
-                      <h1 className="mb-4 text-2xl font-bold">{heading}</h1>
-                      <form>
-                        {schema.fieldsets.map((fieldset) => (
-                          <Accordion
-                            defaultExpandedKeys={['default']}
-                            key={fieldset.id}
-                          >
-                            <AccordionItem id={fieldset.id} key={fieldset.id}>
-                              <AccordionItemTrigger>
-                                {fieldset.title}
-                              </AccordionItemTrigger>
-                              <AccordionPanel>
-                                {(fieldset.fields as DeepKeys<Content>[]).map(
-                                  (schemaField, index) => (
-                                    <form.AppField
-                                      name={schemaField}
-                                      key={index}
-                                      // eslint-disable-next-line react/no-children-prop
-                                      children={(field) => (
-                                        <field.Quanta
-                                          {...schema.properties[schemaField]}
-                                          className="mb-4"
-                                          label={
-                                            schema.properties[field.name].title
-                                          }
-                                          name={field.name}
-                                          defaultValue={field.state.value}
-                                          required={
-                                            schema.required.indexOf(
-                                              schemaField,
-                                            ) !== -1
-                                          }
-                                          error={field.state.meta.errors}
-                                          formAtom={formAtom}
-                                          value={field.state.value}
-                                        />
-                                      )}
-                                    />
-                                  ),
-                                )}
-                              </AccordionPanel>
-                            </AccordionItem>
-                          </Accordion>
-                        ))}
-                      </form>
-                    </div>
+                  content: withAside(
+                    asidePanels?.content,
+                    asidePanels ? (
+                      fieldsetsForm
+                    ) : (
+                      <div className="flex flex-col">
+                        <h1 className="mb-4 text-2xl font-bold">{heading}</h1>
+                        {fieldsetsForm}
+                      </div>
+                    ),
+                    true,
                   ),
                 },
               ]}

packages/cmsui/config/routes.ts

@@ -49,6 +49,17 @@ export default function install(config: ConfigType) {
           },
         ],
       },
+      {
+        type: 'prefix',
+        path: '@@translate',
+        children: [
+          {
+            type: 'route',
+            path: '*',
+            file: '@plone/cmsui/routes/translate.tsx',
+          },
+        ],
+      },
       {
         type: 'prefix',
         path: 'controlpanel',

packages/cmsui/locales/de/common.json

@@ -56,6 +56,11 @@
       "groupMembership": "Gruppenmitgliedschaft",
       "groups": "Gruppen"
     },
+    "translate": {
+      "source": "Quelle",
+      "view_source": "Quellinhalt ansehen",
+      "heading_new": "\"{{title}}\" nach {{language}} übersetzen"
+    },
     "blocksEditor": {
       "blocksTab": "Blöcke",
       "contentTab": "Inhalt"

packages/cmsui/locales/en/common.json

@@ -104,6 +104,11 @@
       "groupMembership": "Group Membership",
       "groups": "Groups"
     },
+    "translate": {
+      "source": "Source",
+      "view_source": "View source content",
+      "heading_new": "Translate \"{{title}}\" to {{language}}"
+    },
     "blocksEditor": {
       "blocksTab": "Blocks",
       "contentTab": "Content"

packages/cmsui/locales/it/common.json

@@ -94,6 +94,11 @@
       "groupMembership": "Appartenenza ai gruppi",
       "groups": "Gruppi"
     },
+    "translate": {
+      "source": "Origine",
+      "view_source": "Visualizza il contenuto di origine",
+      "heading_new": "Traduci \"{{title}}\" in {{language}}"
+    },
     "blocksEditor": {
       "blocksTab": "Blocchi",
       "contentTab": "Contenuto"

packages/cmsui/news/+translate-route.feature

@@ -0,0 +1 @@
+Add `@@translate` route to create and edit translations of a content item. The form is pre-filled with the source content (or the existing translation), and saving creates the translation in the target language root folder and links it to the source. @nils-pzr