flutter - 下拉浮动操作按钮

问题描述

我有这个 floatingActionButton ，它具有以下代码动画。但是我应该怎么做才能让它下降呢？我的意思是我希望按钮从上方打开，项目在主浮动操作按钮下方打开。

import 'package:flutter/material.dart';

class FancyFab extends StatefulWidget {
  final Function() onPressed;
  final String tooltip;
  final IconData icon;

  FancyFab({this.onPressed, this.tooltip, this.icon});

  @override
  _FancyFabState createState() => _FancyFabState();
}

class _FancyFabState extends State<FancyFab>
    with SingleTickerProviderStateMixin {
  bool isOpened = false;
  AnimationController _animationController;
  Animation<Color> _buttonColor;
  Animation<double> _animateIcon;
  Animation<double> _translateButton;
  Curve _curve = Curves.easeOut;
  double _fabHeight = 56.0;

  @override
  initState() {
    _animationController =
        AnimationController(vsync: this, duration: Duration(milliseconds: 500))
          ..addListener(() {
            setState(() {});
          });
    _animateIcon =
        Tween<double>(begin: 0.0, end: 1.0).animate(_animationController);
    _buttonColor = ColorTween(
      begin: Colors.blue,
      end: Colors.red,
    ).animate(CurvedAnimation(
      parent: _animationController,
      curve: Interval(
        0.00,
        1.00,
        curve: Curves.linear,
      ),
    ));
    _translateButton = Tween<double>(
      begin: _fabHeight,
      end: -14.0,
    ).animate(CurvedAnimation(
      parent: _animationController,
      curve: Interval(
        0.0,
        0.75,
        curve: _curve,
      ),
    ));
    super.initState();
  }

  @override
  dispose() {
    _animationController.dispose();
    super.dispose();
  }

  animate() {
    if (!isOpened) {
      _animationController.forward();
    } else {
      _animationController.reverse();
    }
    isOpened = !isOpened;
  }

  Widget add() {
    return Container(
      child: FloatingActionButton(
        onPressed: null,
        tooltip: 'Add',
        child: Icon(Icons.add),
      ),
    );
  }

  Widget image() {
    return Container(
      child: FloatingActionButton(
        onPressed: null,
        tooltip: 'Image',
        child: Icon(Icons.image),
      ),
    );
  }

  Widget inbox() {
    return Container(
      child: FloatingActionButton(
        onPressed: null,
        tooltip: 'Inbox',
        child: Icon(Icons.inbox),
      ),
    );
  }

  Widget toggle() {
    return Container(
      child: FloatingActionButton(
        backgroundColor: _buttonColor.value,
        onPressed: animate,
        tooltip: 'Toggle',
        child: AnimatedIcon(
          icon: AnimatedIcons.menu_close,
          progress: _animateIcon,
        ),
      ),
    );
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.end,
      children: <Widget>[
        Transform(
          transform: Matrix4.translationValues(
            0.0,
            _translateButton.value * 3.0,
            0.0,
          ),
          child: add(),
        ),
        Transform(
          transform: Matrix4.translationValues(
            0.0,
            _translateButton.value * 2.0,
            0.0,
          ),
          child: image(),
        ),
        Transform(
          transform: Matrix4.translationValues(
            0.0,
            _translateButton.value,
            0.0,
          ),
          child: inbox(),
        ),
        toggle(),
      ],
    );
  }
}

你可以在这里看到实现： https ://medium.com/@agungsurya/create-a-simple-animated-floatingactionbutton-in-flutter-2d24f37cfbcc

或者有没有为此目的的替代方案？

标签： flutterdartfloating-action-button

flutter - 下拉浮动操作按钮

问题描述

解决方案

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