[PAINTROID-792] Create fill tool

lib/core/commands/command_factory/command_factory.dart

@@ -12,6 +12,7 @@ import 'package:paintroid/core/commands/command_implementation/graphic/shape/hea
 import 'package:paintroid/core/commands/command_implementation/graphic/shape/square_shape_command.dart';
 import 'package:paintroid/core/commands/command_implementation/graphic/shape/star_shape_command.dart';
 import 'package:paintroid/core/commands/command_implementation/graphic/spray_command.dart';
+import 'package:paintroid/core/commands/command_implementation/graphic/fill_command.dart';
 import 'package:paintroid/core/commands/command_implementation/graphic/color_changed_command.dart';
 import 'package:paintroid/core/commands/path_with_action_history.dart';
 import 'package:paintroid/core/enums/shape_style.dart';
@@ -131,6 +132,10 @@ class CommandFactory {
     return SprayCommand(points, paint);
   }
 
+  FillCommand createFillCommand(List<Offset> points, Paint paint) {
+    return FillCommand(points, paint);
+  }
+
   DeleteRegionCommand createDeleteRegionCommand(
     ui.Rect region,
   ) =>

lib/core/commands/command_implementation/graphic/fill_command.dart

@@ -0,0 +1,53 @@
+// ignore_for_file: must_be_immutable
+
+import 'dart:ui';
+
+import 'package:freezed_annotation/freezed_annotation.dart';
+import 'package:paintroid/core/commands/command_implementation/graphic/graphic_command.dart';
+import 'package:paintroid/core/json_serialization/converter/offset_converter.dart';
+import 'package:paintroid/core/json_serialization/converter/paint_converter.dart';
+import 'package:paintroid/core/json_serialization/versioning/serializer_version.dart';
+import 'package:paintroid/core/json_serialization/versioning/version_strategy.dart';
+
+part 'fill_command.g.dart';
+
+@JsonSerializable()
+class FillCommand extends GraphicCommand {
+  final String type;
+  final int version;
+
+  @OffsetConverter()
+  List<Offset> points;
+
+  FillCommand(
+    this.points,
+    super.paint, {
+    this.type = SerializerType.FILL_COMMAND,
+    int? version,
+  }) : version =
+            version ?? VersionStrategyManager.strategy.getFillCommandVersion();
+
+  @override
+  void call(Canvas canvas) {
+    for (int i = 0; i < points.length; i+=2) {
+      canvas.drawLine(points[i], points[i+1], paint);
+    }
+  }
+
+  @override
+  List<Object?> get props => [paint, points];
+
+  @override
+  Map<String, dynamic> toJson() => _$FillCommandToJson(this);
+
+  factory FillCommand.fromJson(Map<String, dynamic> json) {
+    int version = json['version'] as int;
+
+    switch (version) {
+      case Version.v1:
+        return _$FillCommandFromJson(json);
+      default:
+        return _$FillCommandFromJson(json);
+    }
+  }
+}

lib/core/commands/command_manager/command_manager.dart

@@ -15,6 +15,7 @@ import 'package:paintroid/core/tools/line_tool/vertex_stack.dart';
 import 'package:paintroid/core/tools/tool_data.dart';
 import 'package:paintroid/core/commands/command_implementation/graphic/spray_command.dart';
 import 'package:paintroid/core/commands/command_implementation/graphic/color_changed_command.dart';
+import 'package:paintroid/core/commands/command_implementation/graphic/fill_command.dart';
 
 enum ActionType { UNDO, REDO }
 
@@ -128,6 +129,8 @@ class CommandManager {
       return ToolData.SHAPES;
     } else if (command.runtimeType == HeartShapeCommand) {
       return ToolData.SHAPES;
+    } else if (command is FillCommand) {
+      return ToolData.FILL;
     } else if (command is PathCommand) {
       if (command.isCursorPath) {
         return ToolData.CURSOR;

lib/core/json_serialization/versioning/serializer_version.dart

@@ -9,6 +9,7 @@ class SerializerVersion {
   static const int STAR_SHAPE_COMMAND_VERSION = Version.v1;
   static const int HEART_SHAPE_COMMAND_VERSION = Version.v1;
   static const int SPRAY_COMMAND_VERSION = Version.v1;
+  static const int FILL_COMMAND_VERSION = Version.v1;
   static const int CLIPBOARD_COMMAND_VERSION = Version.v1;
   static const int DELETE_REGION_COMMAND_VERSION = Version.v1;
   static const int COLOR_CHANGED_COMMAND_VERSION = Version.v1;
@@ -32,6 +33,7 @@ class SerializerType {
   static const String STAR_SHAPE_COMMAND = 'StarShapeCommand';
   static const String HEART_SHAPE_COMMAND = 'HeartShapeCommand';
   static const String SPRAY_COMMAND = 'SprayCommand';
+  static const String FILL_COMMAND = 'FillCommand';
   static const String CLIPBOARD_COMMAND = 'ClipboardCommand';
   static const String DELETE_REGION_COMMAND = 'DeleteRegionCommand';
   static const String COLOR_CHANGED_COMMAND = 'ColorChangedCommand';

lib/core/json_serialization/versioning/version_strategy.dart

@@ -19,6 +19,8 @@ abstract class IVersionStrategy {
 
   int getSprayCommandVersion();
 
+  int getFillCommandVersion();
+
   int getClipboardCommandVersion();
 
   int getDeleteRegionCommandVersion();
@@ -58,6 +60,9 @@ class ProductionVersionStrategy implements IVersionStrategy {
   @override
   int getSprayCommandVersion() => SerializerVersion.SPRAY_COMMAND_VERSION;
 
+  @override
+  int getFillCommandVersion() => SerializerVersion.FILL_COMMAND_VERSION;
+
   @override
   int getClipboardCommandVersion() =>
       SerializerVersion.CLIPBOARD_COMMAND_VERSION;

lib/core/providers/object/tools/fill_tool_provider.dart

@@ -0,0 +1,25 @@
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+import 'package:paintroid/core/commands/command_factory/command_factory_provider.dart';
+import 'package:paintroid/core/commands/command_manager/command_manager_provider.dart';
+import 'package:paintroid/core/commands/graphic_factory/graphic_factory_provider.dart';
+import 'package:paintroid/core/providers/state/canvas_state_provider.dart';
+import 'package:paintroid/core/enums/tool_types.dart';
+import 'package:paintroid/core/tools/implementation/fill_tool.dart';
+import 'package:paintroid/core/providers/object/canvas_painter_provider.dart';
+
+part 'fill_tool_provider.g.dart';
+
+@riverpod
+class FillToolProvider extends _$FillToolProvider {
+  @override
+  FillTool build() {
+    return FillTool(
+      type: ToolType.FILL,
+      commandManager: ref.watch(commandManagerProvider),
+      commandFactory: ref.watch(commandFactoryProvider),
+      graphicFactory: ref.watch(graphicFactoryProvider),
+      canvasStateProvider: ref.watch(canvasStateProvider.notifier),
+      canvasPainterProvider: ref.watch(canvasPainterProvider.notifier)
+    );
+  }
+}

lib/core/providers/state/toolbox_state_provider.dart

@@ -7,6 +7,7 @@ import 'package:paintroid/core/providers/object/tools/brush_tool_provider.dart';
 import 'package:paintroid/core/providers/object/tools/clipboard_tool_provider.dart';
 import 'package:paintroid/core/providers/object/tools/cursor_tool_provider.dart';
 import 'package:paintroid/core/providers/object/tools/eraser_tool_provider.dart';
+import 'package:paintroid/core/providers/object/tools/fill_tool_provider.dart';
 import 'package:paintroid/core/providers/object/tools/hand_tool_provider.dart';
 import 'package:paintroid/core/providers/object/tools/line_tool_provider.dart';
 import 'package:paintroid/core/providers/object/tools/pipette_tool_provider.dart';
@@ -16,6 +17,7 @@ import 'package:paintroid/core/providers/object/tools/watercolor_tool_provider.d
 import 'package:paintroid/core/providers/state/paint_provider.dart';
 import 'package:paintroid/core/providers/state/spray_tool_provider.dart';
 import 'package:paintroid/core/providers/state/toolbox_state_data.dart';
+import 'package:paintroid/core/tools/implementation/fill_tool.dart';
 import 'package:paintroid/core/tools/implementation/spray_tool.dart';
 import 'package:paintroid/core/tools/tool_data.dart';
 import 'package:paintroid/ui/utils/toast_utils.dart';
@@ -59,6 +61,10 @@ class ToolBoxStateProvider extends _$ToolBoxStateProvider {
       final currentRadius = (state.currentTool as SprayTool).sprayRadius;
       ref.read(paintProvider.notifier).updateStrokeWidth(currentRadius);
     }
+    if (state.currentTool is FillTool) {
+      final prevStrokeSize = (state.currentTool as FillTool).prevStrokeSize;
+      ref.read(paintProvider.notifier).updateStrokeWidth(prevStrokeSize);
+    }
     switch (data.type) {
       case ToolType.BRUSH:
         state = state.copyWith(currentTool: ref.read(brushToolProvider));
@@ -75,6 +81,12 @@ class ToolBoxStateProvider extends _$ToolBoxStateProvider {
       case ToolType.LINE:
         state = state.copyWith(currentTool: ref.read(lineToolProvider));
         break;
+      case ToolType.FILL:
+        state = state.copyWith(currentTool: ref.read(fillToolProvider));
+        final currentStrokeWidth = ref.read(paintProvider).strokeWidth;
+        (state.currentTool as FillTool).savePrevStrokeSize(currentStrokeWidth);
+        ref.read(paintProvider.notifier).updateStrokeWidth(1);
+        break;
       case ToolType.SHAPES:
         state = state.copyWith(currentTool: ref.read(shapesToolProvider));
         ref.read(canvasPainterProvider.notifier).repaint();