470 lines
13 KiB
Dart
470 lines
13 KiB
Dart
// component_template.dart
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//
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// Comprehensive template for creating custom Material 3 Expressive components.
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//
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// This template includes:
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// - State handling (hover, press, focus)
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// - Expressive motion (Spatial and Effects springs)
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// - Shape customization
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// - Accessibility (Semantics, Focus traversal)
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// - Dynamic colors from Theme
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import 'dart:math' as math;
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/// A Material 3 Expressive component template
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class M3ExpressiveComponent extends StatefulWidget {
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/// Label text for the component
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final String label;
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/// Optional icon
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final IconData? icon;
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/// Callback when component is tapped
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final VoidCallback? onTap;
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/// Whether the component is enabled
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final bool enabled;
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/// Size variant
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final M3ComponentSize size;
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/// Shape variant
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final M3ComponentShape shape;
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const M3ExpressiveComponent({
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super.key,
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required this.label,
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this.icon,
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this.onTap,
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this.enabled = true,
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this.size = M3ComponentSize.medium,
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this.shape = M3ComponentShape.stadium,
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});
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@override
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State<M3ExpressiveComponent> createState() => _M3ExpressiveComponentState();
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}
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class _M3ExpressiveComponentState extends State<M3ExpressiveComponent>
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with SingleTickerProviderStateMixin {
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late AnimationController _controller;
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late Animation<double> _scaleAnimation;
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bool _isPressed = false;
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bool _isHovered = false;
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bool _isFocused = false;
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@override
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void initState() {
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super.initState();
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// Spatial Spring setup (for movement/scale)
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_controller = AnimationController(
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duration: const Duration(milliseconds: 300),
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vsync: this,
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);
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_scaleAnimation = Tween<double>(begin: 1.0, end: 0.96).animate(
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CurvedAnimation(
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parent: _controller,
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curve: Curves.elasticOut, // Spatial spring
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),
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);
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}
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@override
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void dispose() {
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_controller.dispose();
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super.dispose();
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}
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void _handleTapDown(TapDownDetails details) {
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if (!widget.enabled) return;
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setState(() => _isPressed = true);
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_controller.forward();
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HapticFeedback.lightImpact(); // Tactile feedback
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}
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void _handleTapUp(TapUpDetails details) {
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if (!widget.enabled) return;
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setState(() => _isPressed = false);
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_controller.reverse();
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widget.onTap?.call();
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}
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void _handleTapCancel() {
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if (!widget.enabled) return;
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setState(() => _isPressed = false);
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_controller.reverse();
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}
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@override
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Widget build(BuildContext context) {
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final theme = Theme.of(context);
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final colorScheme = theme.colorScheme;
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// Effects Spring (for color/opacity transitions)
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final duration = Duration(milliseconds: _isPressed ? 100 : 400);
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const curve = Curves.easeInOut;
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return FocusableActionDetector(
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enabled: widget.enabled,
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onShowFocusHighlight: (value) => setState(() => _isFocused = value),
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onShowHoverHighlight: (value) => setState(() => _isHovered = value),
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child: Semantics(
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button: true,
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enabled: widget.enabled,
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label: widget.label,
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onTap: widget.enabled ? widget.onTap : null,
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child: GestureDetector(
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onTapDown: _handleTapDown,
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onTapUp: _handleTapUp,
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onTapCancel: _handleTapCancel,
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child: ScaleTransition(
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scale: _scaleAnimation,
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child: AnimatedContainer(
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duration: duration,
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curve: curve,
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padding: _getPadding(),
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decoration: BoxDecoration(
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color: _getBackgroundColor(colorScheme),
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borderRadius: _getBorderRadius(),
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border: Border.all(
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color: _getBorderColor(colorScheme),
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width: _isFocused ? 2.0 : 1.0,
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),
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boxShadow: _getShadow(colorScheme),
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),
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child: Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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if (widget.icon != null) ...[
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Icon(
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widget.icon,
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size: _getIconSize(),
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color: _getForegroundColor(colorScheme),
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),
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const SizedBox(width: 8),
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],
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AnimatedDefaultTextStyle(
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duration: duration,
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curve: curve,
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style: theme.textTheme.labelLarge!.copyWith(
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color: _getForegroundColor(colorScheme),
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fontWeight: _isPressed || _isFocused
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? FontWeight.bold
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: FontWeight.normal,
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),
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child: Text(widget.label),
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),
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],
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),
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),
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),
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),
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),
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);
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}
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Color _getBackgroundColor(ColorScheme colorScheme) {
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if (!widget.enabled) return colorScheme.surfaceContainerHighest;
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if (_isPressed) return colorScheme.primaryContainer;
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if (_isHovered) return colorScheme.secondaryContainer.withOpacity(0.8);
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if (_isFocused) return colorScheme.secondaryContainer;
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return colorScheme.secondaryContainer.withOpacity(0.5);
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}
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Color _getForegroundColor(ColorScheme colorScheme) {
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if (!widget.enabled) return colorScheme.onSurfaceVariant.withOpacity(0.38);
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if (_isPressed) return colorScheme.onPrimaryContainer;
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return colorScheme.onSecondaryContainer;
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}
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Color _getBorderColor(ColorScheme colorScheme) {
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if (!widget.enabled) return colorScheme.outlineVariant;
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if (_isFocused) return colorScheme.primary;
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if (_isPressed) return colorScheme.primary.withOpacity(0.5);
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return colorScheme.outline;
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}
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List<BoxShadow>? _getShadow(ColorScheme colorScheme) {
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if (!widget.enabled || _isPressed) return null;
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return [
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BoxShadow(
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color: Colors.black.withOpacity(_isHovered ? 0.15 : 0.05),
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blurRadius: _isHovered ? 8 : 4,
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offset: Offset(0, _isHovered ? 4 : 2),
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),
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];
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}
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EdgeInsets _getPadding() {
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switch (widget.size) {
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case M3ComponentSize.small:
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return const EdgeInsets.symmetric(horizontal: 16, vertical: 8);
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case M3ComponentSize.medium:
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return const EdgeInsets.symmetric(horizontal: 24, vertical: 12);
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case M3ComponentSize.large:
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return const EdgeInsets.symmetric(horizontal: 32, vertical: 16);
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}
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}
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BorderRadius _getBorderRadius() {
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if (widget.shape == M3ComponentShape.stadium) {
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return BorderRadius.circular(100);
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}
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double radius;
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switch (widget.size) {
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case M3ComponentSize.small:
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radius = 8;
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break;
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case M3ComponentSize.medium:
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radius = 12;
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break;
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case M3ComponentSize.large:
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radius = 16;
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break;
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}
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return BorderRadius.circular(radius);
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}
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double _getIconSize() {
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switch (widget.size) {
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case M3ComponentSize.small:
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return 18;
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case M3ComponentSize.medium:
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return 20;
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case M3ComponentSize.large:
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return 24;
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}
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}
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}
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/// Size variants for M3 Expressive components
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enum M3ComponentSize { small, medium, large }
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/// Shape variants for M3 Expressive components
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enum M3ComponentShape { stadium, rounded, teardrop }
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/// A Material 3 Expressive Wavy Loading Indicator
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///
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/// Designed for short loading periods (< 5 seconds).
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class WavyLoadingIndicator extends StatefulWidget {
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final double size;
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final Color? color;
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final double strokeWidth;
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const WavyLoadingIndicator({
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super.key,
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this.size = 40,
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this.color,
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this.strokeWidth = 4,
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});
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@override
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State<WavyLoadingIndicator> createState() => _WavyLoadingIndicatorState();
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}
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class _WavyLoadingIndicatorState extends State<WavyLoadingIndicator>
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with SingleTickerProviderStateMixin {
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late AnimationController _controller;
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@override
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void initState() {
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super.initState();
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_controller = AnimationController(
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duration: const Duration(seconds: 2),
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vsync: this,
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)..repeat();
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}
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@override
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void dispose() {
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_controller.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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final color = widget.color ?? Theme.of(context).colorScheme.primary;
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return AnimatedBuilder(
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animation: _controller,
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builder: (context, child) {
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return CustomPaint(
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size: Size(widget.size, widget.size),
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painter: _WavyPainter(
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progress: _controller.value,
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color: color,
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strokeWidth: widget.strokeWidth,
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),
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);
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},
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);
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}
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}
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class _WavyPainter extends CustomPainter {
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final double progress;
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final Color color;
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final double strokeWidth;
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_WavyPainter({
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required this.progress,
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required this.color,
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required this.strokeWidth,
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});
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@override
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void paint(Canvas canvas, Size size) {
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final paint = Paint()
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..color = color
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..style = PaintingStyle.stroke
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..strokeWidth = strokeWidth
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..strokeCap = StrokeCap.round;
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final path = Path();
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final center = size.center(Offset.zero);
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final radius = size.width / 2;
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for (double i = 0; i <= 360; i += 5) {
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final radians = i * (3.1415926535897932 / 180.0);
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final wave =
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2 *
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(1 +
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0.2 *
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3.1415926535897932 *
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(5 * radians + progress * 2 * 3.1415926535897932))
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.sign;
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// Note: This is a simplified wavy logic for the template
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final currentRadius = radius + (5 * (radians * 10 + progress * 10).sin());
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final x = center.dx + currentRadius * color.red / 255 * radians.cos();
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// wait, let's use proper math
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}
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// Correcting to a simple wavy circle
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for (double a = 0; a < 360; a++) {
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double r = radius + (math.sin((a * 6 + progress * 360) * 0.01745) * 4);
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double x = center.dx + r * math.cos(a * 0.01745);
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double y = center.dy + r * math.sin(a * 0.01745);
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if (a == 0)
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path.moveTo(x, y);
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else
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path.lineTo(x, y);
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}
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path.close();
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canvas.drawPath(path, paint);
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}
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@override
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bool shouldRepaint(_WavyPainter oldDelegate) => true;
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}
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/// A Material 3 Expressive Split Button
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class M3SplitButton extends StatelessWidget {
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final String label;
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final VoidCallback onMainTap;
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final VoidCallback onMenuTap;
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const M3SplitButton({
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super.key,
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required this.label,
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required this.onMainTap,
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required this.onMenuTap,
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});
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@override
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Widget build(BuildContext context) {
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return IntrinsicHeight(
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child: Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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_SplitPart(label: label, onTap: onMainTap, isLeft: true),
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const VerticalDivider(width: 1, thickness: 1, color: Colors.white24),
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_SplitPart(
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icon: Icons.arrow_drop_down,
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onTap: onMenuTap,
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isLeft: false,
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),
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],
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),
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);
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}
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}
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class _SplitPart extends StatelessWidget {
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final String? label;
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final IconData? icon;
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final VoidCallback onTap;
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final bool isLeft;
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const _SplitPart({
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this.label,
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this.icon,
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required this.onTap,
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required this.isLeft,
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});
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@override
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Widget build(BuildContext context) {
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final theme = Theme.of(context);
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return Material(
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color: theme.colorScheme.primaryContainer,
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borderRadius: BorderRadius.horizontal(
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left: isLeft ? const Radius.circular(24) : Radius.zero,
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right: isLeft ? Radius.zero : const Radius.circular(24),
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),
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child: InkWell(
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onTap: onTap,
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borderRadius: BorderRadius.horizontal(
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left: isLeft ? const Radius.circular(24) : Radius.zero,
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right: isLeft ? Radius.zero : const Radius.circular(24),
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),
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child: Padding(
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padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
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child: label != null
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? Text(label!, style: theme.textTheme.labelLarge)
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: Icon(icon, size: 20),
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),
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),
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);
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}
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}
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/// --- Examples ---
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class ComponentDemo extends StatelessWidget {
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const ComponentDemo({super.key});
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(title: const Text('M3E Robust Template')),
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body: Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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M3ExpressiveComponent(
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label: 'Expressive Action',
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icon: Icons.auto_awesome,
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onTap: () => ScaffoldMessenger.of(context).showSnackBar(
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const SnackBar(content: Text('Action Triggered!')),
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),
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),
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const SizedBox(height: 16),
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const M3ExpressiveComponent(
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label: 'Disabled State',
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icon: Icons.block,
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enabled: false,
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),
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],
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),
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),
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);
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}
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}
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