Akiba So
b1f131814e
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ToolSettings: the active tool + each tool's OWN remembered ToolConfig (color/width), so pen→highlighter→pen restores the pen's last color/width instead of bleeding the highlighter's. Immutable copy-on-write (withActive/ withColor/withWidth only touch the active tool); sensible defaults (black thin pen, yellow fat highlighter, medium eraser). The toolbar holds + persists one. Pure model; fully unit-tested (per-tool isolation, immutability, equality). flutter analyze lib/editor clean; 204/204 tests (+6). Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
89 lines
2.9 KiB
Dart
89 lines
2.9 KiB
Dart
// lib/editor/input/tool_settings.dart
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//
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// Per-tool settings memory for the tool palette (F1/F5/F11). Each tool keeps its
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// OWN color + width, so switching pen → highlighter → pen restores the pen's
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// last color/width instead of bleeding the highlighter's. Immutable value type
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// with copy-on-write updates; the toolbar holds one of these and persists it.
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//
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// Pure (no widgets/storage); fully unit-tested.
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import 'package:flutter/foundation.dart';
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enum EditorToolType { pen, highlighter, eraser }
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/// Color (ARGB int) + width (fraction of page width) for one tool. The eraser
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/// ignores color but keeps a width (its radius).
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@immutable
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class ToolConfig {
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const ToolConfig({required this.color, required this.width});
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final int color;
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final double width;
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ToolConfig copyWith({int? color, double? width}) =>
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ToolConfig(color: color ?? this.color, width: width ?? this.width);
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@override
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bool operator ==(Object other) =>
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other is ToolConfig && other.color == color && other.width == width;
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@override
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int get hashCode => Object.hash(color, width);
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}
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/// The active tool + each tool's remembered [ToolConfig].
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@immutable
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class ToolSettings {
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const ToolSettings({required this.active, required Map<EditorToolType, ToolConfig> configs})
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: _configs = configs;
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/// Sensible starting state: black thin pen, yellow fat highlighter, medium
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/// eraser; pen active.
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factory ToolSettings.defaults() => const ToolSettings(
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active: EditorToolType.pen,
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configs: {
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EditorToolType.pen: ToolConfig(color: 0xFF000000, width: 0.003),
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EditorToolType.highlighter:
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ToolConfig(color: 0x80FFEB3B, width: 0.02),
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EditorToolType.eraser: ToolConfig(color: 0x00000000, width: 0.02),
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},
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);
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final EditorToolType active;
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final Map<EditorToolType, ToolConfig> _configs;
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ToolConfig configFor(EditorToolType tool) =>
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_configs[tool] ?? const ToolConfig(color: 0xFF000000, width: 0.003);
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ToolConfig get activeConfig => configFor(active);
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/// Switch the active tool (each tool's own color/width is remembered).
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ToolSettings withActive(EditorToolType tool) =>
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ToolSettings(active: tool, configs: _configs);
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ToolSettings _withConfig(EditorToolType tool, ToolConfig config) {
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return ToolSettings(
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active: active,
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configs: {..._configs, tool: config},
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);
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}
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/// Set the ACTIVE tool's color (no-op semantics for the eraser are the
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/// caller's choice; the value is still stored).
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ToolSettings withColor(int color) =>
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_withConfig(active, activeConfig.copyWith(color: color));
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/// Set the ACTIVE tool's width.
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ToolSettings withWidth(double width) =>
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_withConfig(active, activeConfig.copyWith(width: width));
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@override
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bool operator ==(Object other) =>
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other is ToolSettings &&
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other.active == active &&
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mapEquals(other._configs, _configs);
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@override
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int get hashCode => Object.hash(active, Object.hashAll(_configs.entries));
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}
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