Cross-platform Uis With Flutter Pdf (2024)

LayoutBuilder(builder: (context, constraints) if (constraints.maxWidth > 800) return WideScreenLayout(); else return MobileLayout(); ) Third-party libraries like adaptive_theme and flutter_platform_widgets simplify platform-aware UI. D. Custom Theming Define light/dark mode and custom color schemes using ThemeData . 4. Platform-Specific UI Considerations | Platform | UI Conventions | Flutter Support | |----------|----------------|------------------| | Android | Material Design (FAB, navigation drawer, ripple effects) | Built-in Material widgets | | iOS | Cupertino style (navigation bars, tab bars, modal sheets) | Built-in Cupertino widgets | | Windows | Fluent Design (acrylic, reveal highlight) | flutter_fluent package | | macOS | AppKit-style (menubar, sidebars) | macos_ui package | | Linux | GTK or custom desktop UI | yaru_widgets (Ubuntu style) | | Web | Responsive, mouse/touch input, URL routing | Full web renderer (HTML or CanvasKit) | 5. Essential Flutter Widgets for Cross-Platform UI | Category | Widgets | |----------|---------| | Layout | Container , Row , Column , Stack , Expanded , Flexible | | Responsive | LayoutBuilder , MediaQuery , OrientationBuilder , FractionallySizedBox | | Navigation | Navigator (mobile), Router (web), go_router (unified) | | Scrolling | ListView , GridView , SingleChildScrollView | | Dialogs | showDialog (Material), showCupertinoDialog | | Input | TextField , Form , platform-specific keyboards | 6. Code Example: Adaptive Button import 'package:flutter/material.dart'; import 'package:flutter/cupertino.dart'; Widget adaptiveButton(BuildContext context, String label, VoidCallback onPressed) final platform = Theme.of(context).platform;

return ElevatedButton( onPressed: onPressed, child: Text(label), );

1. Introduction to Flutter Flutter is Google’s open-source UI toolkit for building natively compiled applications for mobile, web, desktop, and embedded devices from a single codebase. cross-platform uis with flutter pdf

means UI logic runs directly on the device’s native thread, eliminating performance bottlenecks common in other cross-platform tools. 3. UI Adaptation Strategies Creating truly cross-platform UIs requires adapting to each platform’s conventions. Flutter offers several approaches: A. Platform-Specific Widgets Use TargetPlatform to switch widgets dynamically:

if (platform == TargetPlatform.iOS) return CupertinoButton( child: Text(label), onPressed: onPressed, ); Widget adaptiveButton(BuildContext context

| Behavior | Android/iOS | Desktop/Web | |----------|-------------|--------------| | | Touch fling | Mouse wheel + scrollbars | | Right-click | Not applicable | Context menus | | Hover effects | None | Highlighting | | Keyboard shortcuts | Limited | Full (Ctrl+C, etc.) | | Window sizing | Fixed | Resizable, maximize, snap |

if (Theme.of(context).platform == TargetPlatform.iOS) CupertinoButton(...) else ElevatedButton(...) Use LayoutBuilder , MediaQuery , and FractionallySizedBox to adapt to screen sizes: return ElevatedButton( onPressed: onPressed

Beyond visuals, adapt interactions: