feat: support click to create content inside empty toggle list (#6854)

* feat: support click to create content inside empty toggle list

* test: support click to create content inside empty toggle list

* fix: toggle list rtl issue

* chore: optimize cover title request node logic

frontend/appflowy_flutter/integration_test/desktop/document/document_with_toggle_list_test.dart

@@ -1,7 +1,9 @@
 import 'dart:io';
 
+import 'package:appflowy/generated/locale_keys.g.dart';
 import 'package:appflowy/plugins/document/presentation/editor_plugins/plugins.dart';
 import 'package:appflowy_editor/appflowy_editor.dart';
+import 'package:easy_localization/easy_localization.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
@@ -263,5 +265,24 @@ void main() {
       expect(node.attributes[ToggleListBlockKeys.level], 3);
       expect(node.delta!.toPlainText(), 'Hello');
     });
+
+    testWidgets('click the toggle list to create a new paragraph',
+        (tester) async {
+      await prepareToggleHeadingBlock(tester, '> # Hello');
+      final emptyHintText = find.text(
+        LocaleKeys.document_plugins_emptyToggleHeading.tr(
+          args: ['1'],
+        ),
+      );
+      expect(emptyHintText, findsOneWidget);
+
+      await tester.tapButton(emptyHintText);
+      await tester.pumpAndSettle();
+
+      // check the new paragraph is created
+      final editorState = tester.editor.getCurrentEditorState();
+      final node = editorState.getNodeAtPath([0, 0])!;
+      expect(node.type, ParagraphBlockKeys.type);
+    });
   });
 }

frontend/appflowy_flutter/lib/plugins/document/document_page.dart

@@ -163,7 +163,11 @@ class _DocumentPageState extends State<DocumentPage>
     return Provider(
       create: (_) {
         final context = SharedEditorContext();
-        if (widget.view.name.isEmpty) {
+        final children = editorState.document.root.children;
+        final firstDelta = children.firstOrNull?.delta;
+        final isEmptyDocument =
+            children.length == 1 && (firstDelta == null || firstDelta.isEmpty);
+        if (widget.view.name.isEmpty && isEmptyDocument) {
           context.requestCoverTitleFocus = true;
         }
         return context;

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/header/cover_title.dart

@@ -163,6 +163,10 @@ class _InnerCoverTitleState extends State<_InnerCoverTitle> {
   bool _shouldFocus(ViewPB view, ViewState? state) {
     final name = state?.view.name ?? view.name;
 
+    if (editorState.document.root.children.isNotEmpty) {
+      return false;
+    }
+
     // if the view's name is empty, focus on the title
     if (name.isEmpty) {
       return true;
@@ -180,6 +184,15 @@ class _InnerCoverTitleState extends State<_InnerCoverTitle> {
 
   void _onFocusChanged() {
     if (titleFocusNode.hasFocus) {
+      // if the document is empty, disable the keyboard service
+      final children = editorState.document.root.children;
+      final firstDelta = children.firstOrNull?.delta;
+      final isEmptyDocument =
+          children.length == 1 && (firstDelta == null || firstDelta.isEmpty);
+      if (!isEmptyDocument) {
+        return;
+      }
+
       if (editorState.selection != null) {
         Log.info('cover title got focus, clear the editor selection');
         editorState.selection = null;

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/toggle/toggle_block_component.dart

@@ -1,6 +1,6 @@
 import 'package:appflowy/generated/locale_keys.g.dart';
 import 'package:appflowy_editor/appflowy_editor.dart';
-import 'package:easy_localization/easy_localization.dart';
+import 'package:easy_localization/easy_localization.dart' hide TextDirection;
 import 'package:flowy_infra_ui/flowy_infra_ui.dart';
 import 'package:flutter/material.dart';
 import 'package:universal_platform/universal_platform.dart';
@@ -211,25 +211,7 @@ class _ToggleListBlockComponentWidgetState
     BuildContext context, {
     bool withBackgroundColor = false,
   }) {
-    final textDirection = calculateTextDirection(
-      layoutDirection: Directionality.maybeOf(context),
-    );
-
-    Widget child = Container(
-      width: double.infinity,
-      alignment: alignment,
-      child: Row(
-        mainAxisSize: MainAxisSize.min,
-        crossAxisAlignment: CrossAxisAlignment.start,
-        textDirection: textDirection,
-        children: [
-          _buildExpandIcon(),
-          Flexible(
-            child: _buildRichText(),
-          ),
-        ],
-      ),
-    );
+    Widget child = _buildToggleBlock();
 
     child = BlockSelectionContainer(
       node: node,
@@ -265,6 +247,58 @@ class _ToggleListBlockComponentWidgetState
     return child;
   }
 
+  Widget _buildToggleBlock() {
+    final textDirection = calculateTextDirection(
+      layoutDirection: Directionality.maybeOf(context),
+    );
+    final crossAxisAlignment = textDirection == TextDirection.ltr
+        ? CrossAxisAlignment.start
+        : CrossAxisAlignment.end;
+
+    return Container(
+      width: double.infinity,
+      alignment: alignment,
+      child: Column(
+        mainAxisSize: MainAxisSize.min,
+        crossAxisAlignment: crossAxisAlignment,
+        children: [
+          Row(
+            mainAxisSize: MainAxisSize.min,
+            crossAxisAlignment: CrossAxisAlignment.start,
+            textDirection: textDirection,
+            children: [
+              _buildExpandIcon(),
+              Flexible(
+                child: _buildRichText(),
+              ),
+            ],
+          ),
+          _buildPlaceholder(),
+        ],
+      ),
+    );
+  }
+
+  Widget _buildPlaceholder() {
+    // if the toggle block is collapsed or it contains children, don't show the
+    // placeholder.
+    if (collapsed || node.children.isNotEmpty) {
+      return const SizedBox.shrink();
+    }
+
+    return Padding(
+      padding: indentPadding,
+      child: FlowyButton(
+        text: FlowyText(
+          buildPlaceholderText(),
+          color: Theme.of(context).hintColor,
+        ),
+        margin: const EdgeInsets.symmetric(horizontal: 3.0, vertical: 8),
+        onTap: onAddContent,
+      ),
+    );
+  }
+
   Widget _buildRichText() {
     final textDirection = calculateTextDirection(
       layoutDirection: Directionality.maybeOf(context),
@@ -304,6 +338,9 @@ class _ToggleListBlockComponentWidgetState
 
   Widget _buildExpandIcon() {
     double buttonHeight = UniversalPlatform.isDesktop ? 22.0 : 26.0;
+    final textDirection = calculateTextDirection(
+      layoutDirection: Directionality.maybeOf(context),
+    );
 
     if (level != null) {
       // top padding * 2 + button height = height of the heading text
@@ -316,23 +353,27 @@ class _ToggleListBlockComponentWidgetState
       }
     }
 
+    final turns = switch (textDirection) {
+      TextDirection.ltr => collapsed ? 0.0 : 0.25,
+      TextDirection.rtl => collapsed ? -0.5 : -0.75,
+    };
+
     return Container(
       constraints: BoxConstraints(
         minWidth: 26,
         minHeight: buttonHeight,
       ),
-      child: FlowyIconButton(
-        width: 20.0,
-        onPressed: onCollapsed,
-        icon: Container(
-          padding: const EdgeInsets.only(right: 4.0),
-          child: AnimatedRotation(
-            turns: collapsed ? 0.0 : 0.25,
-            duration: const Duration(milliseconds: 200),
-            child: const Icon(
-              Icons.arrow_right,
-              size: 18.0,
-            ),
+      alignment: Alignment.center,
+      child: FlowyButton(
+        margin: const EdgeInsets.all(2.0),
+        useIntrinsicWidth: true,
+        onTap: onCollapsed,
+        text: AnimatedRotation(
+          turns: turns,
+          duration: const Duration(milliseconds: 200),
+          child: const Icon(
+            Icons.arrow_right,
+            size: 18.0,
           ),
         ),
       ),
@@ -347,4 +388,24 @@ class _ToggleListBlockComponentWidgetState
     transaction.afterSelection = editorState.selection;
     await editorState.apply(transaction);
   }
+
+  Future<void> onAddContent() async {
+    final transaction = editorState.transaction;
+    final path = node.path.child(0);
+    transaction.insertNode(
+      path,
+      paragraphNode(),
+    );
+    transaction.afterSelection = Selection.collapsed(Position(path: path));
+    await editorState.apply(transaction);
+  }
+
+  String buildPlaceholderText() {
+    if (level != null) {
+      return LocaleKeys.document_plugins_emptyToggleHeading.tr(
+        args: [level.toString()],
+      );
+    }
+    return LocaleKeys.document_plugins_emptyToggleList.tr();
+  }
 }

frontend/resources/translations/en.json

@@ -1704,6 +1704,8 @@
       "insertDate": "Insert date",
       "emoji": "Emoji",
       "toggleList": "Toggle list",
+      "emptyToggleHeading": "Empty toggle heading {}. Click to add content",
+      "emptyToggleList": "Empty toggle list. Click to add content",
       "quoteList": "Quote list",
       "numberedList": "Numbered list",
       "bulletedList": "Bulleted list",