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A web standards-compliant, high-performance rendering engine based on Flutter.

Home Page: https://openkraken.com

License: Apache License 2.0

CMake 1.16% C++ 16.89% C 0.10% JavaScript 4.89% TypeScript 49.60% Kotlin 0.01% CSS 0.02% Ruby 0.20% Swift 0.06% Objective-C 0.18% Dart 26.76% Java 0.11% Shell 0.01% HTML 0.01%
kraken flutter web engine

kraken's People

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airingursb avatar andycall avatar anjihang avatar answershuto avatar cnryb avatar diyism avatar hydra1983 avatar qingyangmoke avatar suyulin avatar temper357 avatar whn9527 avatar wssgcg1213 avatar xgheaven avatar xuzhongpeng avatar yifei8 avatar yuanyan avatar zpferyb avatar

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kraken's Issues

完善 input 功能

当前只实现了最基本的输入能力,与 Web 还有不少差距需要补齐

支持 overscroll-behavior

以控制拖动的 bunnce 等默认效果。 https://developer.mozilla.org/en-US/docs/Web/CSS/overscroll-behavior

bounce 会增强一些场景下的体验,但也会导致一些场景下带来问题,以及在某些低端机场景下期望关闭该动画来优化性能。参考:https://www.smashingmagazine.com/2018/08/scroll-bouncing-websites/ 由于 safari 不支持该 CSS 属性以及早起某些浏览器不支持,社区有前端层面实现的库来模拟 bounce 效果或者去除 bounce 效果的。比如 https://github.com/lazd/iNoBounce 。实现的方法是判断 touchmove,如果到 scroll 的 top 并且继续向上则 preventDefault(到底部同)。

Example failed to run with ENOENT - No such file or directory @ rb_check_realpath_internal - .kraken_bridge.framework

Report
What did you do?
ℹ example : flutter run or pod install

What did you expect to happen?
ℹ with no error

What happened instead?
Errno:: ENOENT - No such file or directory @ rb_check_realpath_internal - ../kraken/kraken/example/ios/.symlinks/plugins/kraken/ios/kraken_bridge.framework

CocoaPods Environment

CocoaPods : 1.10.1
        Ruby : ruby 2.7.2p137 (2020-10-01 revision 5445e04352) [x86_64-darwin20]
    RubyGems : 3.2.5
        Host : macOS 11.2.1 (20D74)
       Xcode : 12.4 (12D4e)
         Git : git version 2.24.3 (Apple Git-128)
Ruby lib dir : ~/.rvm/rubies/ruby-2.7.2/lib
Repositories : trunk - CDN - https://cdn.cocoapods.org/

Flutter Environment

    • Flutter version 1.22.6 at ~/flutter
    • Framework revision 9b2d32b605 (7 weeks ago), 2021-01-22 14:36:39 -0800
    • Engine revision 2f0af37152
    • Dart version 2.10.5

支持相邻的 TextNode 跨标签合并成 Paragraph

实现以下与 web 相同的文本效果:

  1. 将相邻标签内的 TextNode 合并成一整个 Paragraph 进行展示
  2. 对于跨行的文本 border 能进行跨行展示

Web

image

Kraken

image

测试代码

// test file: /Users/andycall/work/kraken/tests/integration/specs/css/css-position/position-absolute.ts
// it: in-inline-002

let BODY = document.body;
BODY.style.margin = '0px';

let split;
let containerSpan;
let outerSpan;
outerSpan = create(
  'span',
  {
    'box-sizing': 'border-box',
  },
  [
    createText(`outer span`),
    (containerSpan = create(
      'span',
      {
        position: 'relative',
        border: '1px solid gray',
        'box-sizing': 'border-box',
      },
      [
        createText(`container span start`),
        (split = create('div', {
          width: '10px',
          height: '10px',
          'box-sizing': 'border-box',
        })),
        createText(`container span end`),
      ]
    )),
    createText(`outer span end`),
  ]
);
BODY.appendChild(outerSpan);


/**
 * Kraken cli compact library. used to preview kraken rendering.
 */
function setStyle(dom, object) {
    if (object == null)
        return;
    for (let key in object) {
        if (object.hasOwnProperty(key)) {
            dom.style[key] = object[key];
        }
    }
}
function setAttributes(dom, object) {
    for (const key in object) {
        if (object.hasOwnProperty(key)) {
            dom.setAttribute(key, object[key]);
        }
    }
}
function sleep(second) {
    return new Promise(done => setTimeout(done, second * 1000));
}
function create(tag, style, child) {
    const el = document.createElement(tag);
    setStyle(el, style);
    if (Array.isArray(child)) {
        child.forEach(c => el.appendChild(c));
    }
    else if (child) {
        el.appendChild(child);
    }
    return el;
}
function createText(content) {
    return document.createTextNode(content);
}
function append(parent, child) {
    parent.appendChild(child);
}
async function matchScreenshot() {
    return new Promise((resolve) => {
        requestAnimationFrame(() => {
            resolve();
        });
    });
}
async function matchElementImageSnapshot(element) {
    return Promise.resolve();
}
async function it(name, fn) {
    console.log('starting ' + name);
    if (fn.length > 0) {
        const timer = setTimeout(() => {
            throw new Error('it execute timeout of 5000ms');
        }, 5000);
        const done = () => {
            console.log('done call');
            clearTimeout(timer);
        };
        fn(done);
    }
    else {
        fn();
    }
}
function xit(name, fn) {
    it(name, fn);
}

    

支持 addEventListener(type, listenerObject) 写法

MDN:https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener

const Something = function(element) {
  // |this| is a newly created object
  this.name = 'Something Good';
  this.handleEvent = function(event) {
    console.log(this.name); // 'Something Good', as this is bound to newly created object
    switch(event.type) {
      case 'click':
        // some code here...
        break;
      case 'dblclick':
        // some code here...
        break;
    }
  };

  // Note that the listeners in this case are |this|, not this.handleEvent
  element.addEventListener('click', this, false);
  element.addEventListener('dblclick', this, false);

  // You can properly remove the listeners
  element.removeEventListener('click', this, false);
  element.removeEventListener('dblclick', this, false);
}
const s = new Something(document.body);

实现 W3C stacking context 规则

image

<div id="div1"><br />
        <span class="bold">DIV #1</span><br />
        position: relative;
        <div id="div2"><br />
            <span class="bold">DIV #2</span><br />
            position: absolute;<br />
            z-index: 2;
        </div>
    </div>

    <br />

    <div id="div3"><br />
        <span class="bold">DIV #3</span><br />
        position: relative;<br />
        z-index: 1;
        <div id="div4"><br />
            <span class="bold">DIV #4</span><br />
            position: absolute;<br />
            z-index: 10;
        </div>
    </div>

background-image 指定 base64 格式的 url 报错

现象

image

测试代码

it('should work with image of no width in flex layout', async (done) => {
    let div;
    let image;
    div = createElement(
      'div',
      {
        style: {
          display: 'flex',
        },
      },
      [
        image = createElement('div', {
            style: {
                width: '100px',
                height: '100px',
                backgroundRepeat: 'no-repeat',
                backgroundImage: 'url(data:image/png;base64,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)'
            }
        }),
      ]
    );
    BODY.appendChild(div);

    image.onload = async () => {
      await matchViewportSnapshot();
      done();
    };
  });

图片渲染过程中有报错

.hero-img {
  width: 80%;
}

二次渲染图片有报错,可能与 flutter 图片缓存机制有关:

flutter: NoSuchMethodError: The method '*' was called on null.
Receiver: null
Tried calling: *(827.0)
#0      Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5)
#1      ImageElement._resize (package:kraken/src/dom/tags/img.dart:296:28)
#2      ImageElement.didAttachRenderer (package:kraken/src/dom/tags/img.dart:107:5)
#3      Element.attachTo (package:kraken/src/dom/element.dart:622:5)
#4      Element.ensureChildAttached (package:kraken/src/dom/element.dart:665:17)
#5      Element.attachTo (package:kraken/src/dom/element.dart:569:5)
#6      Element.ensureChildAttached (package:kraken/src/dom/element.dart:665:17)
#7      Element.attachTo (package:kraken/src/dom/element.dart:569:5)
#8      Element.appendChild (package:kraken/src/dom/element.dart:683:17)
#9      ElementManager.insertAdjacentNode (package:kraken/src/dom/element_manager.dart:314:16)
#10     KrakenViewController.insertAdjacentNode (package:kraken/src/launcher/controller.dart:267:21)
#11     flushUICommand (package:kraken/src/bridge/to_native.dart:393:29)
#12     initBridge.<anonymous closure>.<anonymous closure> (package:kraken/src/bridge/bridge.dart:42:9)
#13     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1117:15)
#14     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1055:9)
#15     SchedulerBinding._handleDrawFrame (package:flutter/src/scheduler/binding.dart:971:5)
#16     _rootRun (dart:async/zone.dart:1190:13)
#17     _CustomZone.run (dart:async/zone.dart:1093:19)
#18     _CustomZone.runGuarded (dart:async/zone.dart:997:7)
#19     _invoke (dart:ui/hooks.dart:251:10)
#20     _drawFrame (dart:ui/hooks.dart:209:3)

手势能力插件化

用户可以自定义手势能力,通过插件的机制注册到 element 中。

支持 word-break: break-all

Flutter 对于多行文本的换行符目前是指定为空格,无法实现 css word-break: break-all 的效果在单词中间换行。

由于文本排版是在 Flutter engine 内部控制,需要 Flutter 官方提供支持 flutter/flutter#61081

Web
image

Kraken
image

Windows 平台的工具链支持

现在的构建工具脚本,JSC,包括发布到 pub.dev 的二进制包在桌面平台上现在都仅提供了 macOS 平台的支持。

考虑到有很多用户使用的是 Windows 电脑进行开发,有必要提供可以在 Windows 上运行的工具链

start example fail

按照readme启动example时,执行flutter run 失败。报错如下 :

../lib/src/gesture/scroll_position_with_single_context.dart:37:7: Error: The non-abstract class 'ScrollPositionWithSingleContext' is missing implementations for these members:

  • ViewportOffset.hasPixels
    Try to either
  • provide an implementation,
  • inherit an implementation from a superclass or mixin,
  • mark the class as abstract, or
  • provide a 'noSuchMethod' implementation.

class ScrollPositionWithSingleContext extends ScrollPosition implements ScrollActivityDelegate {
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
../../../flutter/packages/flutter/lib/src/rendering/viewport_offset.dart:96:12: Context: 'ViewportOffset.hasPixels' is defined here.
bool get hasPixels;
^^^^^^^^^

FAILURE: Build failed with an exception.

  • Where:
    Script '/Users/chenzefeng/Development/flutter/packages/flutter_tools/gradle/flutter.gradle' line: 991

  • What went wrong:
    Execution failed for task ':app:compileFlutterBuildDebug'.

Process 'command '/Users/chenzefeng/Development/flutter/bin/flutter'' finished with non-zero exit value 1

  • Try:
    Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

  • Get more help at https://help.gradle.org

BUILD FAILED in 14s

CSS repeating-radial-gradient 参数合法性检测

background-image: repeating-radial-gradient(closest-corner circle at 9999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999%, green, green)

当前效果
image

期望效果
image

Boost warm up by jsc/quickjs snapshot

  1. 优先考虑 android 的 jsc 是不是有机会支持 bytecode,ios 下放弃支持 bytecode
  2. 如果 1 不可行考虑支持 quickjs 引擎,同时做到 android/ios 两边引擎对齐

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