import 'package:flutter/material.dart'; import 'package:flutter/widgets.dart'; import 'package:flutter_2048/views/number_text.dart'; import 'package:flutter_2048/views/block/base_block.dart'; import 'package:flutter_2048/model/block_info.dart'; double getBegin(BlockInfo info, int mode) { return (info.current % mode == info.before % mode ? info.before ~/ mode - info.current ~/ mode : info.before % mode - info.current % mode) * 1.0; } class MoveBlock extends BaseBlock { final BlockInfo info; final int mode; MoveBlock({ Key key, this.info, this.mode, AnimationController controller, }) : super( key: key, animation: Tween(begin: getBegin(info, mode), end: 0) .animate(controller), ); @override Widget buildBlock(BuildContext context, BlockProps props) { Animation animation = listenable; var direction = info.current % mode == info.before % mode ? 1 : 0; return Positioned( top: (info.current ~/ props.mode) * (props.blockWidth + props.borderWidth), left: (info.current % props.mode) * (props.blockWidth + props.borderWidth), child: Transform.translate( offset: direction == 0 ? Offset( animation.value * (props.blockWidth + props.borderWidth), 0) : Offset( 0, animation.value * (props.blockWidth + props.borderWidth)), child: NumberText(value: this.info.value, size: props.blockWidth), ), ); } } void getDirection(double current, double before) {}