feat: support aligning the text block using shortcuts (#4319)

frontend/appflowy_flutter/integration_test/document/document_alignment_test.dart

@@ -1,8 +1,11 @@
 import 'package:appflowy/generated/flowy_svgs.g.dart';
+import 'package:appflowy/plugins/document/presentation/editor_plugins/plugins.dart';
 import 'package:appflowy_editor/appflowy_editor.dart';
+import 'package:flutter/services.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:integration_test/integration_test.dart';
 
+import '../util/keyboard.dart';
 import '../util/util.dart';
 
 void main() {
@@ -42,5 +45,51 @@ void main() {
       await tester.tapButtonWithFlowySvgData(FlowySvgs.toolbar_align_left_s);
       expect(first.attributes[blockComponentAlign], 'left');
     });
+
+    testWidgets('edit alignment using shortcut', (tester) async {
+      await tester.initializeAppFlowy();
+      await tester.tapGoButton();
+
+      // click the first line of the readme
+      await tester.editor.tapLineOfEditorAt(0);
+
+      await tester.pumpAndSettle();
+
+      final editorState = tester.editor.getCurrentEditorState();
+      final first = editorState.getNodeAtPath([0])!;
+      
+      // expect to see text aligned to the right
+      await FlowyTestKeyboard.simulateKeyDownEvent(
+        [
+          LogicalKeyboardKey.control,
+          LogicalKeyboardKey.shift,
+          LogicalKeyboardKey.keyR,
+        ],
+        tester: tester,
+      );
+      expect(first.attributes[blockComponentAlign], rightAlignmentKey);
+
+      // expect to see text aligned to the center
+      await FlowyTestKeyboard.simulateKeyDownEvent(
+        [
+          LogicalKeyboardKey.control,
+          LogicalKeyboardKey.shift,
+          LogicalKeyboardKey.keyE,
+        ],
+        tester: tester,
+      );
+      expect(first.attributes[blockComponentAlign], centerAlignmentKey);
+
+      // expect to see text aligned to the left
+      await FlowyTestKeyboard.simulateKeyDownEvent(
+        [
+          LogicalKeyboardKey.control,
+          LogicalKeyboardKey.shift,
+          LogicalKeyboardKey.keyL,
+        ],
+        tester: tester,
+      );
+      expect(first.attributes[blockComponentAlign], leftAlignmentKey);
+    });
   });
 }

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_page.dart

@@ -1,5 +1,6 @@
 import 'package:appflowy/plugins/document/application/doc_bloc.dart';
 import 'package:appflowy/plugins/document/presentation/editor_configuration.dart';
+import 'package:appflowy/plugins/document/presentation/editor_plugins/align_toolbar_item/custom_text_align_command.dart';
 import 'package:appflowy/plugins/document/presentation/editor_plugins/background_color/theme_background_color.dart';
 import 'package:appflowy/plugins/document/presentation/editor_plugins/base/page_reference_commands.dart';
 import 'package:appflowy/plugins/document/presentation/editor_plugins/i18n/editor_i18n.dart';
@@ -31,6 +32,7 @@ final List<CommandShortcutEvent> commandShortcutEvents = [
   customCopyCommand,
   customPasteCommand,
   customCutCommand,
+  ...customTextAlignCommands,
   ...standardCommandShortcutEvents,
 ];
 
@@ -86,6 +88,7 @@ class _AppFlowyEditorPageState extends State<AppFlowyEditorPage> {
     customCopyCommand,
     customPasteCommand,
     customCutCommand,
+    ...customTextAlignCommands,
     ...standardCommandShortcutEvents,
     ..._buildFindAndReplaceCommands(),
   ];

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/align_toolbar_item/align_toolbar_item.dart

@@ -7,6 +7,10 @@ import 'package:flowy_infra_ui/flowy_infra_ui.dart';
 import 'package:flowy_infra_ui/widget/flowy_tooltip.dart';
 import 'package:flutter/material.dart';
 
+const String leftAlignmentKey = 'left';
+const String centerAlignmentKey = 'center';
+const String rightAlignmentKey = 'right'; 
+
 final alignToolbarItem = ToolbarItem(
   id: 'editor.align',
   group: 4,
@@ -23,13 +27,13 @@ final alignToolbarItem = ToolbarItem(
 
     bool isHighlight = false;
     FlowySvgData data = FlowySvgs.toolbar_align_left_s;
-    if (isSatisfyCondition((value) => value == 'left')) {
+    if (isSatisfyCondition((value) => value == leftAlignmentKey)) {
       isHighlight = true;
       data = FlowySvgs.toolbar_align_left_s;
-    } else if (isSatisfyCondition((value) => value == 'center')) {
+    } else if (isSatisfyCondition((value) => value == centerAlignmentKey)) {
       isHighlight = true;
       data = FlowySvgs.toolbar_align_center_s;
-    } else if (isSatisfyCondition((value) => value == 'right')) {
+    } else if (isSatisfyCondition((value) => value == rightAlignmentKey)) {
       isHighlight = true;
       data = FlowySvgs.toolbar_align_right_s;
     }
@@ -121,19 +125,19 @@ class _AlignButtons extends StatelessWidget {
           _AlignButton(
             icon: FlowySvgs.toolbar_align_left_s,
             tooltips: LocaleKeys.document_plugins_optionAction_left.tr(),
-            onTap: () => onAlignChanged('left'),
+            onTap: () => onAlignChanged(leftAlignmentKey),
           ),
           const _Divider(),
           _AlignButton(
             icon: FlowySvgs.toolbar_align_center_s,
             tooltips: LocaleKeys.document_plugins_optionAction_center.tr(),
-            onTap: () => onAlignChanged('center'),
+            onTap: () => onAlignChanged(centerAlignmentKey),
           ),
           const _Divider(),
           _AlignButton(
             icon: FlowySvgs.toolbar_align_right_s,
             tooltips: LocaleKeys.document_plugins_optionAction_right.tr(),
-            onTap: () => onAlignChanged('right'),
+            onTap: () => onAlignChanged(rightAlignmentKey),
           ),
           const HSpace(4),
         ],

frontend/appflowy_flutter/lib/plugins/document/presentation/editor_plugins/align_toolbar_item/custom_text_align_command.dart

@@ -0,0 +1,71 @@
+import 'package:appflowy/plugins/document/presentation/editor_plugins/plugins.dart';
+import 'package:appflowy_editor/appflowy_editor.dart';
+import 'package:flutter/material.dart';
+
+final List<CommandShortcutEvent> customTextAlignCommands = [
+  customTextLeftAlignCommand,
+  customTextCenterAlignCommand,
+  customTextRightAlignCommand,
+];
+
+/// Windows / Linux : ctrl + shift + l
+/// macOS           : ctrl + shift + l
+/// Allows the user to align text to the left
+///
+/// - support
+///   - desktop
+///   - web
+///
+final CommandShortcutEvent customTextLeftAlignCommand = CommandShortcutEvent(
+  key: 'Align text to the left',
+  command: 'ctrl+shift+l',
+  handler: (editorState) => _textAlignHandler(editorState, leftAlignmentKey),
+);
+
+/// Windows / Linux : ctrl + shift + e
+/// macOS           : ctrl + shift + e
+/// Allows the user to align text to the center
+///
+/// - support
+///   - desktop
+///   - web
+///
+final CommandShortcutEvent customTextCenterAlignCommand = CommandShortcutEvent(
+  key: 'Align text to the center',
+  command: 'ctrl+shift+e',
+  handler: (editorState) => _textAlignHandler(editorState, centerAlignmentKey),
+);
+
+/// Windows / Linux : ctrl + shift + r
+/// macOS           : ctrl + shift + r
+/// Allows the user to align text to the right
+///
+/// - support
+///   - desktop
+///   - web
+///
+final CommandShortcutEvent customTextRightAlignCommand = CommandShortcutEvent(
+  key: 'Align text to the right',
+  command: 'ctrl+shift+r',
+  handler: (editorState) => _textAlignHandler(editorState, rightAlignmentKey),
+);
+
+KeyEventResult _textAlignHandler(EditorState editorState, String align) {
+  final Selection? selection = editorState.selection;
+
+  if (selection == null) {
+    return KeyEventResult.ignored;
+  }
+  
+  editorState.updateNode(
+    selection,
+    (node) => node.copyWith(
+      attributes: {
+        ...node.attributes,
+        blockComponentAlign: align,
+      },
+    ),
+  );
+
+  return KeyEventResult.handled;
+}