Added legend to compose

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

@@ -90,6 +90,9 @@ import androidx.constraintlayout.widget.Group;
 import androidx.core.content.FileProvider;
 import androidx.cursoradapter.widget.SimpleCursorAdapter;
 import androidx.documentfile.provider.DocumentFile;
+import androidx.fragment.app.Fragment;
+import androidx.fragment.app.FragmentManager;
+import androidx.fragment.app.FragmentTransaction;
 import androidx.lifecycle.Lifecycle;
 import androidx.lifecycle.Observer;
 import androidx.preference.PreferenceManager;
@@ -1027,6 +1030,9 @@ public class FragmentCompose extends FragmentBase {
             case R.id.menu_clear:
                 StyleHelper.apply(R.id.menu_clear, etBody);
                 return true;
+            case R.id.menu_legend:
+                onMenuLegend();
+                return true;
             case R.id.menu_contact_group:
                 onMenuContactGroup();
                 return true;
@@ -1141,6 +1147,21 @@ public class FragmentCompose extends FragmentBase {
         bottom_navigation.setLayoutParams(params);
     }
 
+    private void onMenuLegend() {
+        if (getLifecycle().getCurrentState().isAtLeast(Lifecycle.State.STARTED))
+            getParentFragmentManager().popBackStack("legend", FragmentManager.POP_BACK_STACK_INCLUSIVE);
+
+        Bundle args = new Bundle();
+        args.putString("tab", "compose");
+
+        Fragment fragment = new FragmentLegend();
+        fragment.setArguments(args);
+
+        FragmentTransaction fragmentTransaction = getParentFragmentManager().beginTransaction();
+        fragmentTransaction.replace(R.id.content_frame, fragment).addToBackStack("legend");
+        fragmentTransaction.commit();
+    }
+
     private void onMenuContactGroup() {
         Bundle args = new Bundle();
         args.putLong("working", working);

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

@@ -72,6 +72,16 @@ public class FragmentLegend extends FragmentBase {
         if (layout < 0) {
             TabLayout tabLayout = view.findViewById(R.id.tab_layout);
             tabLayout.setupWithViewPager(pager);
+
+            Bundle args = getArguments();
+            if (args != null) {
+                String tab = args.getString("tab");
+                if ("compose".equals(tab))
+                    pager.setCurrentItem(3);
+
+                args.remove("tab");
+                setArguments(args);
+            }
         }
     }
 

app/src/main/res/menu/menu_compose.xml

@@ -25,6 +25,11 @@
         android:title="@string/title_compact"
         app:showAsAction="never" />
 
+    <item
+        android:id="@+id/menu_legend"
+        android:title="@string/menu_legend"
+        app:showAsAction="never" />
+
     <item
         android:id="@+id/menu_clear"
         android:title="@string/title_style_clear"