Compose translate subject

app/src/main/java/eu/faircode/email/FragmentCompose.java

@@ -2643,6 +2643,13 @@ public class FragmentCompose extends FragmentBase {
         if (languages == null)
             languages = new ArrayList<>();
 
+        boolean subjectHasFocus = etSubject.hasFocus();
+
+        boolean canTranslate;
+        if (subjectHasFocus) {
+            CharSequence text = etSubject.getText();
+            canTranslate = (text != null && !TextUtils.isEmpty(text.toString().trim()));
+        } else {
             int s = etBody.getSelectionStart();
             Editable edit = etBody.getText();
             if (s > 1 && s <= edit.length() &&
@@ -2652,7 +2659,8 @@ public class FragmentCompose extends FragmentBase {
                 etBody.setSelection(s - 1, s - 1);
 
             Pair<Integer, Integer> paragraph = StyleHelper.getParagraph(etBody);
-        boolean canTranslate = (DeepL.canTranslate(context) && paragraph != null);
+            canTranslate = (DeepL.canTranslate(context) && paragraph != null);
+        }
 
         PopupMenuLifecycle popupMenu = new PopupMenuLifecycle(context, getViewLifecycleOwner(), anchor);
 
@@ -2696,6 +2704,34 @@ public class FragmentCompose extends FragmentBase {
             }
 
             private void onMenuTranslate(String target) {
+                if (subjectHasFocus) {
+                    CharSequence text = etSubject.getText();
+                    if (text == null && TextUtils.isEmpty(text.toString().trim()))
+                        return;
+
+                    Bundle args = new Bundle();
+                    args.putString("target", target);
+                    args.putCharSequence("text", text);
+
+                    new SimpleTask<DeepL.Translation>() {
+                        @Override
+                        protected DeepL.Translation onExecute(Context context, Bundle args) throws Throwable {
+                            String target = args.getString("target");
+                            CharSequence text = args.getCharSequence("text");
+                            return DeepL.translate(text, true, target, context);
+                        }
+
+                        @Override
+                        protected void onExecuted(Bundle args, DeepL.Translation translation) {
+                            etSubject.setText(translation.translated_text);
+                        }
+
+                        @Override
+                        protected void onException(Bundle args, Throwable ex) {
+                            Log.unexpectedError(getParentFragmentManager(), ex, !(ex instanceof IOException));
+                        }
+                    }.serial().execute(FragmentCompose.this, args, "compose:translate");
+                } else {
                     final Pair<Integer, Integer> paragraph = StyleHelper.getParagraph(etBody);
                     if (paragraph == null)
                         return;
@@ -2819,6 +2855,7 @@ public class FragmentCompose extends FragmentBase {
                         }
                     }.serial().execute(FragmentCompose.this, args, "compose:translate");
                 }
+            }
         });
 
         popupMenu.showWithIcons(context, anchor);