| 1 | import 'package:flutter/material.dart'; |
| 2 | |
| 3 | class AnimatedTypingText extends StatefulWidget { |
| 4 | final List<String> words; |
| 5 | final TextStyle? style; |
| 6 | final Duration typingSpeed; |
| 7 | final Duration pauseDuration; |
| 8 | final Color cursorColor; |
| 9 | final double cursorWidth; |
| 10 | final double cursorHeight; |
| 11 | final Duration cursorBlinkDuration; |
| 12 | |
| 13 | const AnimatedTypingText({ |
| 14 | Key? key, |
| 15 | required this.words, |
| 16 | this.style, |
| 17 | this.typingSpeed = const Duration(milliseconds: 100), |
| 18 | this.pauseDuration = const Duration(milliseconds: 3000), |
| 19 | this.cursorColor = Colors.black, |
| 20 | this.cursorWidth = 2.0, |
| 21 | this.cursorHeight = 20.0, |
| 22 | this.cursorBlinkDuration = const Duration(milliseconds: 500), |
| 23 | }) : super(key: key); |
| 24 | |
| 25 | @override |
| 26 | State<AnimatedTypingText> createState() => _AnimatedTypingTextState(); |
| 27 | } |
| 28 | |
| 29 | class _AnimatedTypingTextState extends State<AnimatedTypingText> with TickerProviderStateMixin { |
| 30 | late AnimationController _controller; |
| 31 | late AnimationController _cursorController; |
| 32 | late Animation<double> _cursorAnimation; |
| 33 | |
| 34 | String _displayText = ''; |
| 35 | |
| 36 | int _currentWordIndex = 0; |
| 37 | int _currentCharIndex = 0; |
| 38 | |
| 39 | bool _isTyping = true; |
| 40 | bool _isPaused = false; |
| 41 | bool _isWaitingForPause = false; |
| 42 | |
| 43 | @override |
| 44 | void initState() { |
| 45 | super.initState(); |
| 46 | _controller = AnimationController( |
| 47 | vsync: this, |
| 48 | duration: widget.typingSpeed, |
| 49 | ); |
| 50 | |
| 51 | _cursorController = AnimationController( |
| 52 | vsync: this, |
| 53 | duration: widget.cursorBlinkDuration, |
| 54 | )..repeat(reverse: true); |
| 55 | |
| 56 | _cursorAnimation = Tween<double>(begin: 1.0, end: 0.0).animate( |
| 57 | CurvedAnimation( |
| 58 | parent: _cursorController, |
| 59 | curve: Curves.easeInOut, |
| 60 | ), |
| 61 | ); |
| 62 | |
| 63 | _controller.addStatusListener((status) { |
| 64 | if (status == AnimationStatus.completed) { |
| 65 | _updateText(); |
| 66 | if (!_isWaitingForPause) { |
| 67 | _controller.reset(); |
| 68 | _controller.forward(); |
| 69 | } |
| 70 | } |
| 71 | }); |
| 72 | |
| 73 | _controller.forward(); |
| 74 | } |
| 75 | |
| 76 | void _updateText() { |
| 77 | if (_isWaitingForPause) return; |
| 78 | |
| 79 | if (_isPaused) { |
| 80 | if (_isTyping) { |
| 81 | _isTyping = false; |
| 82 | _isWaitingForPause = true; |
| 83 | Future.delayed(widget.pauseDuration, () { |
| 84 | if (mounted) { |
| 85 | setState(() { |
| 86 | _isPaused = false; |
| 87 | _isWaitingForPause = false; |
| 88 | _controller.reset(); |
| 89 | _controller.forward(); |
| 90 | }); |
| 91 | } |
| 92 | }); |
| 93 | } else { |
| 94 | _deletePrevChar(); |
| 95 | } |
| 96 | } else { |
| 97 | if (_isTyping) { |
| 98 | _typeNextChar(); |
| 99 | } else { |
| 100 | _deletePrevChar(); |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | setState(() { |
| 105 | _displayText = widget.words[_currentWordIndex].substring(0, _currentCharIndex); |
| 106 | }); |
| 107 | } |
| 108 | |
| 109 | void _typeNextChar() { |
| 110 | if (_currentCharIndex < widget.words[_currentWordIndex].length) { |
| 111 | _currentCharIndex++; |
| 112 | } else { |
| 113 | _isPaused = true; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | void _deletePrevChar() { |
| 118 | if (_currentCharIndex > 0) { |
| 119 | _currentCharIndex--; |
| 120 | } else { |
| 121 | _currentWordIndex = (_currentWordIndex + 1) % widget.words.length; |
| 122 | _currentCharIndex = 0; |
| 123 | _isTyping = true; |
| 124 | _isPaused = false; |
| 125 | } |
| 126 | } |
| 127 | |
| 128 | @override |
| 129 | void dispose() { |
| 130 | _controller.dispose(); |
| 131 | _cursorController.dispose(); |
| 132 | super.dispose(); |
| 133 | } |
| 134 | |
| 135 | @override |
| 136 | Widget build(BuildContext context) { |
| 137 | return Stack( |
| 138 | clipBehavior: Clip.none, |
| 139 | children: [ |
| 140 | // Fixed cursor position |
| 141 | Positioned( |
| 142 | right: 0, |
| 143 | bottom: 0, |
| 144 | child: AnimatedBuilder( |
| 145 | animation: _cursorAnimation, |
| 146 | builder: (context, child) { |
| 147 | return Opacity( |
| 148 | opacity: _cursorAnimation.value, |
| 149 | child: Container( |
| 150 | width: widget.cursorWidth, |
| 151 | height: widget.cursorHeight, |
| 152 | color: widget.cursorColor, |
| 153 | ), |
| 154 | ); |
| 155 | }, |
| 156 | ), |
| 157 | ), |
| 158 | // Animated text |
| 159 | Align( |
| 160 | alignment: Alignment.centerRight, |
| 161 | child: Text( |
| 162 | _displayText + ' ', |
| 163 | style: widget.style, |
| 164 | ), |
| 165 | ), |
| 166 | ], |
| 167 | ); |
| 168 | } |
| 169 | } |