Flutter ConstraintLayout

使用约束构建灵活的布局，类似于Android的ConstraintLayout。

无论布局有多复杂，依赖关系有多深，ConstraintLayout的每个子元素都只会测量一次，这带来了极高的布局性能。

功能

  1. 使用约束构建灵活的布局
  2. margin and goneMargin
  3. clickPadding(在不改变子元素实际尺寸的情况下，扩大其点击区域)
  4. 可见性控制
  5. 约束完整性提示
  6. bias

即将推出

  1. guideline（参考线）
  2. barrier
  3. 约束可视化
  4. chain
  5. 更多...

支持平台

  1. Android
  2. iOS
  3. Mac
  4. Windows
  5. Linux
  6. Web

导入

Null-safety（空安全）

dependencies:
  flutter_constraintlayout:
    git:
      url: 'https://github.com/hackware1993/Flutter-ConstraintLayout.git'
      ref: 'v0.1-alpha'

示例

import 'package:flutter/material.dart';
import 'package:flutter_constraintlayout/constrait_layout/constraint_layout.dart';

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      backgroundColor: Colors.black,
      body: ConstraintLayout(
        children: [
          Constrained(
            id: 'box1',
            width: 200,
            height: 200,
            topToTop: CL.parent,
            rightToRight: CL.parent,
            child: Container(
              color: Colors.redAccent,
              alignment: Alignment.center,
              child: const Text('box1'),
            ),
          ),
          Constrained(
            id: 'box2',
            width: CL.matchConstraint,
            height: CL.matchConstraint,
            leftToLeft: 'box3',
            rightToRight: 'box3',
            topToBottom: 'box3',
            bottomToBottom: CL.parent,
            child: Container(
              color: Colors.blue,
              alignment: Alignment.center,
              child: const Text('box2'),
            ),
          ),
          Constrained(
            id: 'box4',
            width: 50,
            height: 50,
            rightToRight: CL.parent,
            bottomToBottom: CL.parent,
            child: Container(
              color: Colors.redAccent,
              alignment: Alignment.center,
              child: const Text('box4'),
            ),
          ),
          Constrained(
            id: 'box7',
            width: 120,
            height: 120,
            centerVertical: true,
            verticalBias: 0.5,
            leftToRight: 'box3',
            rightToRight: CL.parent,
            horizontalBias: 0.5,
            child: Container(
              color: Colors.lightGreen,
              alignment: Alignment.center,
              child: const Text('box7'),
            ),
          ),
          Constrained(
            id: 'box8',
            width: CL.matchConstraint,
            height: CL.matchConstraint,
            topToTop: 'box1',
            leftToLeft: CL.parent,
            rightToLeft: 'box3',
            bottomToBottom: CL.parent,
            margin: const EdgeInsets.all(50),
            child: Container(
              color: Colors.lightGreen,
              alignment: Alignment.center,
              child: const Text('box8'),
            ),
          ),
          Constrained(
            id: 'box3',
            width: CL.wrapContent,
            height: CL.wrapContent,
            rightToLeft: 'box1',
            topToBottom: 'box1',
            child: Container(
              color: Colors.orange,
              width: 200,
              height: 300,
              alignment: Alignment.center,
              child: const Text('box3'),
            ),
          ),
          Constrained(
            width: 100,
            height: 100,
            center: true,
            child: Container(
              color: Colors.pink,
              alignment: Alignment.center,
              child: const Text('child[6]'),
            ),
          )
        ],
      ),
    ),
  ));
}

example.webp

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许可证

MIT License

Copyright (c) 2022 hackware1993

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.

GitHub

查看 Github