75 lines
1.9 KiB
Dart
75 lines
1.9 KiB
Dart
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import 'dart:math';
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import 'package:flutter/material.dart';
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class RepeatOnHoldButton extends StatefulWidget {
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/// Function to be called on tap and on long press.
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/// Return [false] to signify that the loop should be broken after execution.
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final bool? Function() onTap;
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/// Specifies whether repetition speeds up when the user keeps holding the button.
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final bool increaseSpeed;
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/// Specifies how many ms should pass before action is repeated.
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final int initialRepetitionIntervalMs;
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/// Specifies by how much the interval between actions should be divided after [speedUpAfterTimes] times.
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final int speedUpFactor;
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/// Specifies how many times [onTap] will be called before increasing the speed.
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final int speedUpAfterTimes;
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final Widget child;
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const RepeatOnHoldButton({
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Key? key,
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required this.onTap,
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this.increaseSpeed = true,
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this.initialRepetitionIntervalMs = 250,
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this.speedUpFactor = 2,
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this.speedUpAfterTimes = 5,
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required this.child,
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}) : super(key: key);
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@override
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_RepeatOnHoldButtonState createState() => _RepeatOnHoldButtonState();
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}
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class _RepeatOnHoldButtonState extends State<RepeatOnHoldButton> {
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bool _isHeld = false;
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void onLongPress() async {
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setState(() {
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_isHeld = true;
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});
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int holdCycle = 0;
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int speed = widget.initialRepetitionIntervalMs;
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while (true) {
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final result = widget.onTap() ?? true;
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if (!_isHeld || !result) {
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break;
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}
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holdCycle++;
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if (speed > 1 && holdCycle % widget.speedUpAfterTimes == 0) {
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speed = max(1, (speed ~/ widget.speedUpFactor));
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}
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await Future.delayed(
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Duration(
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milliseconds: speed,
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),
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);
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}
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}
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@override
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Widget build(BuildContext context) {
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return GestureDetector(
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onLongPress: onLongPress,
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onLongPressEnd: (_) => _isHeld = false,
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child: widget.child,
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);
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}
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}
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