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feat: Add InheritedWidget-based ScreenUtilPlusScope and context-aware extensions (v1.4.0)
Major Features: - Add ScreenUtilPlusScope for efficient, targeted rebuilds - Add autoRebuild parameter (defaults to true for backward compatibility) - Add context-aware extensions (context.w(), context.h(), context.sp(), etc.) - Add comprehensive context extension methods for EdgeInsets and BorderRadius - Update R-widgets (RContainer, RText) to be context-aware Performance: - Significantly improve rebuild performance with autoRebuild: false - Only widgets using context-aware extensions rebuild on screen changes - Reduce unnecessary tree-wide rebuilds Testing: - Add 25+ new tests across 6 new test files - Achieve 99.2% code coverage (1574/1586 lines) - Total 619 tests passing - New test files: * screen_util_plus_scope_test.dart * responsive_size_context_test.dart * context_extension_test.dart * adaptive_text_style_test.dart * screen_util_plus_desktop_test.dart * screen_util_plus_edge_cases_test.dart Example App: - Add ScopeDemoPage showcasing new features - Add interactive demo comparing rebuild behavior - Add visual demonstrations of context-aware extensions Documentation: - Update README with comprehensive v1.4.0 documentation - Add Performance Optimization section - Add migration guide for context-aware extensions - Update CHANGELOG with detailed release notes - Update version to 1.4.0 Code Quality: - Simplify context_extension.dart for 100% coverage - Remove unused imports - Add explicit braces for better readability - Improve code formatting and consistency BREAKING CHANGES: None - fully backward compatible
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‎.gitignore‎

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!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages
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!/dev/ci/**/Gemfile.lock
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.agent/rules/

‎CHANGELOG.md‎

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All notable changes to this project will be documented in this file.
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## [1.3.2] - 2025-12-11
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## [1.4.0] - 2025-12-23
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### Fixed
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### Added
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- **InheritedWidget-Based Scope**: Introduced `ScreenUtilPlusScope` for efficient, targeted rebuilds
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- New `autoRebuild` parameter in `ScreenUtilPlusInit` (defaults to `true` for backward compatibility)
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- When `autoRebuild: false`, only widgets that explicitly depend on `ScreenUtilPlusScope` rebuild
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- Significantly improves performance by avoiding unnecessary tree-wide rebuilds
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- Accessible via `ScreenUtilPlus.of(context)` or `context.su`
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- **Context-Aware Extensions**: New `ResponsiveSizeContext` extension on `BuildContext`
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- `context.w(value)` - Scale width
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- `context.h(value)` - Scale height
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- `context.r(value)` - Scale radius
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- `context.sp(value)` - Scale font size
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- `context.spMin(value)` - Scale font size with minimum
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- `context.dg(value)` - Scale diagonal
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- `context.dm(value)` - Scale diameter
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- `context.verticalSpace(value)` - Create vertical spacing
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- `context.horizontalSpace(value)` - Create horizontal spacing
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- `context.edgeInsets(...)` - Create scaled EdgeInsets
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- `context.borderRadius(...)` - Create scaled BorderRadius
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- These extensions work efficiently with `autoRebuild: false` by registering InheritedWidget dependencies
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- **Example App Enhancements**:
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- New `ScopeDemoPage` showcasing `ScreenUtilPlusScope` features and performance benefits
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- Interactive demo comparing rebuild behavior with `autoRebuild` on/off
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- Visual demonstrations of context-aware extensions
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- **Comprehensive Test Coverage**:
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- Added 25+ new tests across 6 new test files
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- Achieved **99.2% code coverage** (1574/1586 lines) with **619 total tests**
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- New test files:
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- `screen_util_plus_scope_test.dart` - InheritedWidget functionality
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- `responsive_size_context_test.dart` - Context-aware extensions
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- `context_extension_test.dart` - Context extension methods
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- `adaptive_text_style_test.dart` - Adaptive text styles including xxl breakpoint
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- `screen_util_plus_desktop_test.dart` - Desktop platform support
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- `screen_util_plus_edge_cases_test.dart` - Edge case scenarios
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### Changed
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- **Simplified Context Extension**: Refactored `mediaQueryData` getter in `ScreenUtilContextExtension`
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- Removed unreachable `View.maybeOf` fallback for cleaner code
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- Now simply returns `MediaQuery.maybeOf(this)`
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- Achieved 100% test coverage for this file
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- **R-Widgets Enhancement**: Updated `RContainer` and `RText` to be context-aware
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- Now use `context.su` to register InheritedWidget dependencies
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- Benefit from efficient rebuilds when `autoRebuild: false`
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- **Code Quality Improvements**:
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- Removed unused imports across multiple files
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- Added explicit braces to single-line if statements for better readability
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- Improved code formatting and consistency
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### Performance
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- **Rebuild Optimization**: With `autoRebuild: false`, only widgets that explicitly use:
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- `ScreenUtilPlus.of(context)` or `context.su`
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- Context-aware extensions (`context.w()`, `context.h()`, etc.)
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- R-widgets (`RContainer`, `RText`, etc.)
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will rebuild when screen metrics change, significantly reducing unnecessary rebuilds
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### Migration Guide
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For existing users, no changes are required. The default behavior (`autoRebuild: true`) maintains backward compatibility.
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To opt into the new performance optimizations:
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1. Set `autoRebuild: false` in `ScreenUtilPlusInit`
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2. Use context-aware extensions (`context.w()`) instead of num extensions (`100.w`)
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3. Or use R-widgets (`RContainer`, `RText`) which are already context-aware
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- **Robustness**: Resolved zero-screen-dimension issues by implementing a unified `ScreenUtilContextExtension`. This ensures consistent fallback to `View.maybeOf(context)` across all utilities (`size_class.dart`, `responsive_query.dart`, etc.) when `MediaQuery` is unavailable.
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See the new `ScopeDemoPage` in the example app for a complete demonstration.
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## [1.3.1] - 2025-12-10
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‎README.md‎

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## ✨ Features
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- 📱 **Responsive Scaling**: Automatic scaling of width, height, font size, and more
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- 🎯 **CSS-like Breakpoints**: Media query-style breakpoints (Bootstrap, Tailwind, Material Design)
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- ⚡ **InheritedWidget-Based Scope**: Efficient, targeted rebuilds with `ScreenUtilPlusScope`
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- 🎯 **Context-Aware Extensions**: New `context.w()`, `context.h()`, `context.sp()` for optimal performance
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- 🎨 **CSS-like Breakpoints**: Media query-style breakpoints (Bootstrap, Tailwind, Material Design)
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- 📐 **SwiftUI-like Size Classes**: Compact/Regular size classes for adaptive layouts
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- 🎨 **Adaptive Widgets**: Breakpoint-aware containers, text, and builders
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- 🚀 **Performance Optimized**: Intelligent rebuild detection with Equatable
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- 🧩 **Adaptive Widgets**: Breakpoint-aware containers, text, and builders
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- 🚀 **Performance Optimized**: Intelligent rebuild detection with optional `autoRebuild: false`
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- 🎭 **Responsive Theme**: Automatic text style scaling in themes
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- 📦 **Zero Configuration**: Works out of the box with sensible defaults
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- 🧪 **Well Tested**: 98.3% code coverage with 500+ tests
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- 🧪 **Well Tested**: 99.2% code coverage with 619 tests
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## 📦 Installation
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Add this to your package's `pubspec.yaml` file:
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```yaml
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dependencies:
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flutter_screenutil_plus: ^1.3.2
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flutter_screenutil_plus: ^1.4.0
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```
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Then run:
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)
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```
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### 2. Use Responsive Extensions
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```dart
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Container(
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width: 100.w, // Responsive width
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height: 50.h, // Responsive height
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padding: EdgeInsets.all(16.r), // Responsive padding
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child: Text(
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'Hello World',
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style: TextStyle(fontSize: 16.sp), // Responsive font
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),
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)
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```
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### 3. **NEW in v1.4.0**: Context-Aware Extensions (Recommended)
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For better performance with `autoRebuild: false`, use context-aware extensions:
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```dart
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Container(
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width: context.w(100), // Context-aware width
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height: context.h(50), // Context-aware height
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padding: context.edgeInsets(all: 16), // Context-aware padding
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child: Text(
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'Hello World',
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style: TextStyle(fontSize: context.sp(16)), // Context-aware font
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),
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)
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```
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## 🚀 Performance Optimization (v1.4.0)
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### InheritedWidget-Based Scope
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Version 1.4.0 introduces `ScreenUtilPlusScope` for efficient, targeted rebuilds:
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```dart
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ScreenUtilPlusInit(
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designSize: const Size(360, 690),
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autoRebuild: false, // 🎯 NEW: Disable automatic tree-wide rebuilds
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builder: (context, child) {
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return MaterialApp(
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home: child,
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);
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},
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child: HomePage(),
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)
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```
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**Benefits of `autoRebuild: false`:**
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- ⚡ **Significantly faster** - Only widgets that need responsive values rebuild
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- 🎯 **Targeted updates** - Only widgets using `context.w()`, `context.su`, or R-widgets rebuild
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- 🔄 **Backward compatible** - Defaults to `true` for existing apps
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### Context-Aware Extensions
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When using `autoRebuild: false`, use context-aware extensions for optimal performance:
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```dart
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// ✅ Recommended with autoRebuild: false
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context.w(100) // Scale width
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context.h(50) // Scale height
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context.r(20) // Scale radius
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context.sp(16) // Scale font size
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context.spMin(12) // Scale font with minimum
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context.dg(100) // Scale diagonal
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context.dm(100) // Scale diameter
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// Spacing helpers
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context.verticalSpace(20) // Vertical spacing
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context.horizontalSpace(20) // Horizontal spacing
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// Complex values
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context.edgeInsets(all: 16) // Scaled EdgeInsets
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context.edgeInsets( // Custom EdgeInsets
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horizontal: 16,
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vertical: 8,
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)
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context.borderRadius(all: 12) // Scaled BorderRadius
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// Access ScreenUtilPlus instance
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final su = context.su; // Get ScreenUtilPlus instance
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```
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### Migration to Context-Aware Extensions
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```dart
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// ❌ Old way (still works, but rebuilds entire tree)
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Container(width: 100.w, height: 50.h)
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// ✅ New way (efficient with autoRebuild: false)
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Container(width: context.w(100), height: context.h(50))
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```
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**When to use each:**
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- **`autoRebuild: true`** (default): Use `.w`, `.h`, `.sp` extensions - simpler syntax
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- **`autoRebuild: false`**: Use `context.w()`, `context.h()`, `context.sp()` - better performance
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## 📚 Core Features
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### Responsive Extensions
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| Property | Type | Default Value | Description |
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| ----------------- | ---------------- | ----------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------- |
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| designSize | Size | Size(360,690) | The size of the device screen in the design draft, in dp |
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| autoRebuild | bool | true | **NEW in v1.4.0**: When false, only widgets using context-aware extensions or `context.su` rebuild on screen changes (improves performance) |
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| builder | Function | null | Return widget that uses the library in a property (ex: MaterialApp's theme) |
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| child | Widget | null | A part of builder that its dependencies/properties don't use the library |
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| rebuildFactor | RebuildFactor | RebuildFactors.size | Function that takes old and new screen metrics and returns whether to rebuild or not when changes occur. See [RebuildFactors](#rebuild-factors) |
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#### Context Extensions
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| Extension | Description | Example |
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| ---------------------- | ----------------------------- | ------------------------------------------------- |
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| `context.breakpoint` | Current breakpoint | `context.breakpoint` |
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| `context.isAtLeast()` | Check if at least breakpoint | `context.isAtLeast(Breakpoint.md)` |
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| `context.isLessThan()` | Check if less than breakpoint | `context.isLessThan(Breakpoint.lg)` |
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| `context.isBetween()` | Check if between breakpoints | `context.isBetween(Breakpoint.sm, Breakpoint.lg)` |
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| `context.sizeClasses` | Get size classes | `context.sizeClasses` |
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| `context.adaptive()` | Get AdaptiveValues | `context.adaptive()` |
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| `context.responsive()` | Get ResponsiveQuery | `context.responsive()` |
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| Extension | Description | Example |
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| --------------------------- | ----------------------------- | ------------------------------------------------- |
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| **Context-Aware (v1.4.0)** | | |
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| `context.w(value)` | Scale width | `context.w(100)` |
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| `context.h(value)` | Scale height | `context.h(50)` |
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| `context.r(value)` | Scale radius | `context.r(20)` |
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| `context.sp(value)` | Scale font size | `context.sp(16)` |
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| `context.spMin(value)` | Scale font with minimum | `context.spMin(12)` |
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| `context.dg(value)` | Scale diagonal | `context.dg(100)` |
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| `context.dm(value)` | Scale diameter | `context.dm(100)` |
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| `context.verticalSpace()` | Create vertical spacing | `context.verticalSpace(20)` |
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| `context.horizontalSpace()` | Create horizontal spacing | `context.horizontalSpace(20)` |
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| `context.edgeInsets()` | Create scaled EdgeInsets | `context.edgeInsets(all: 16)` |
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| `context.borderRadius()` | Create scaled BorderRadius | `context.borderRadius(all: 12)` |
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| `context.su` | Get ScreenUtilPlus instance | `context.su` |
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| **Breakpoints** | | |
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| `context.breakpoint` | Current breakpoint | `context.breakpoint` |
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| `context.isAtLeast()` | Check if at least breakpoint | `context.isAtLeast(Breakpoint.md)` |
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| `context.isLessThan()` | Check if less than breakpoint | `context.isLessThan(Breakpoint.lg)` |
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| `context.isBetween()` | Check if between breakpoints | `context.isBetween(Breakpoint.sm, Breakpoint.lg)` |
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| **Size Classes** | | |
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| `context.sizeClasses` | Get size classes | `context.sizeClasses` |
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| **Utilities** | | |
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| `context.adaptive()` | Get AdaptiveValues | `context.adaptive()` |
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| `context.responsive()` | Get ResponsiveQuery | `context.responsive()` |
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| `context.mediaQueryData` | Get MediaQueryData | `context.mediaQueryData` |
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#### Widgets
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‎example/lib/home_page.dart‎

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import 'package:flutter/material.dart';
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import 'package:flutter_screenutil_plus/flutter_screenutil_plus.dart';
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import 'package:flutter_screenutil_plus_example/scope_demo_page.dart';
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class HomePage extends StatefulWidget {
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const HomePage({super.key});
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],
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),
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),
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10.verticalSpace,
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SizedBox(
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width: double.infinity,
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child: ElevatedButton.icon(
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onPressed: () {
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Navigator.push(
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context,
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MaterialPageRoute(
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builder: (context) => const ScopeDemoPage(),
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),
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);
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},
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icon: Icon(Icons.widgets, size: 18.sp),
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label: Text(
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'View InheritedWidget Demo',
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style: TextStyle(fontSize: 14.sp),
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),
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style: ElevatedButton.styleFrom(
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backgroundColor: Colors.purple.shade600,
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foregroundColor: Colors.white,
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padding: EdgeInsets.symmetric(vertical: 12.h),
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),
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),
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),
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],
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),
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);

‎example/lib/main.dart‎

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designSize: const Size(360, 690),
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minTextAdapt: true,
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splitScreenMode: true,
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autoRebuild: false,
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// NEW: Set autoRebuild to false for better performance
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// When false, only widgets using context.su or R-widgets will rebuild
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// autoRebuild: false,
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// Use builder only if you need to use library outside ScreenUtilPlusInit context
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builder: (context, child) {
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return MaterialApp(

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