dart

How to: rotate a selected/set image (Flutter)

由 落花浮王杯 提交于 2020-12-06 04:06:16
问题 I've managed to rotate images to landscape/portrait after selecting them from Image picker (gallery/camera) .. This works fine, and will continue set new images to my desired orientation .. However, I'm trying to use the same method to rotate an already selected/set image and it doesn't work .. Here is the logic I'm using: void _rotateImage(File file) async { print('>>> rotating image'); try { List<int> imageBytes = await file.readAsBytes(); final originalImage = img.decodeImage(imageBytes);

How to: rotate a selected/set image (Flutter)

由 回眸只為那壹抹淺笑 提交于 2020-12-06 04:05:52
问题 I've managed to rotate images to landscape/portrait after selecting them from Image picker (gallery/camera) .. This works fine, and will continue set new images to my desired orientation .. However, I'm trying to use the same method to rotate an already selected/set image and it doesn't work .. Here is the logic I'm using: void _rotateImage(File file) async { print('>>> rotating image'); try { List<int> imageBytes = await file.readAsBytes(); final originalImage = img.decodeImage(imageBytes);

Home Screen widget in Flutter

由 心已入冬 提交于 2020-12-06 04:01:21
问题 I have to build a flutter app where the data need to be shown on home screen of the phone, if the app is in background mode. Till now i have not found any relevant information regarding the home screen widget or how to create the app widget in flutter except the one that we can build app widget in native(Android/iOS). Native widget in android Do i need to handle app widget from the native code or is there a way to handle app widget in flutter. 来源： https://stackoverflow.com/questions/58724673

Flutter For Web Cookie/Token Sessions and Authentcation

由 只愿长相守 提交于 2020-12-05 12:31:48
问题 I am working on a full stack app using NodeJS and Flutter For Web , at the moment i don't understand how to make safe cookie/token sessions . The answer i need is how to make an authentication system with Flutter For Web like other Social Networks or Stackoverflow itself. 回答1: Importing dart.html directly doesn't support from flutter 1.9 : Reference I came across the package universal_html while digging in for the solution, and its working fine for me. Below is my helper class to store key

Filling a DataTable with Firestore and Flutter (using StreamBuilder)

由 不打扰是莪最后的温柔 提交于 2020-12-05 11:19:52
问题 How to populate a DataTable using StreamBuilder? Below is my code: new StreamBuilder( stream: widget._returnStreamWithActiveKeysOnly(), builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) { if (!snapshot.hasData) return new Text('Loading...'); return new DataTable( columns: <DataColumn>[ new DataColumn( label: Text('type'), tooltip: 'Ordinary or service (1 day only, restricted time)', ), new DataColumn(label: Text('Key')), new DataColumn(label: Text('Check-in')), new

Filling a DataTable with Firestore and Flutter (using StreamBuilder)

由 旧街凉风 提交于 2020-12-05 11:16:30
问题 How to populate a DataTable using StreamBuilder? Below is my code: new StreamBuilder( stream: widget._returnStreamWithActiveKeysOnly(), builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) { if (!snapshot.hasData) return new Text('Loading...'); return new DataTable( columns: <DataColumn>[ new DataColumn( label: Text('type'), tooltip: 'Ordinary or service (1 day only, restricted time)', ), new DataColumn(label: Text('Key')), new DataColumn(label: Text('Check-in')), new

Filling a DataTable with Firestore and Flutter (using StreamBuilder)

由 旧街凉风 提交于 2020-12-05 11:16:05
问题 How to populate a DataTable using StreamBuilder? Below is my code: new StreamBuilder( stream: widget._returnStreamWithActiveKeysOnly(), builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) { if (!snapshot.hasData) return new Text('Loading...'); return new DataTable( columns: <DataColumn>[ new DataColumn( label: Text('type'), tooltip: 'Ordinary or service (1 day only, restricted time)', ), new DataColumn(label: Text('Key')), new DataColumn(label: Text('Check-in')), new

Flutter extension-methods not working, it says “undefined class” and “requires the extension-methods language feature”

由 好久不见. 提交于 2020-12-05 05:00:34
问题 I'm slowly building my personal website over at dlblack.dev, and I'm trying to spice it up a little bit. For example, from a computer (rather than a tablet or phone since they don't have mouse pointers), if you hover over any of the clickable items, it doesn't change your mouse pointer to indicate it's clickable, and the clickable object doesn't change at all. I've decided to follow this FilledStacks tutorial, but it doesn't mention anything about fixing this problem. Essentially what's

How to properly enable/disable Flutter's Button

由 ◇◆丶佛笑我妖孽 提交于 2020-12-05 04:59:09
问题 Upon research, Flutter's Button is disabled automatically when the onPressed is null. However due to my necessary testing function I am forced to place an arrow function () => , which doesn't seem to trigger the onPressed as actually null, but returning null as value. Therefore currently the button just does nothing (null) when textField is empty. I am aiming to disable it fully (grayed out) if the textField is empty. onPressed: () => (_textController.text.isNotEmpty) ? _addNewPair() : null,

我在阿里巴巴做 Serverless 云研发平台

由 坚强是说给别人听的谎言 提交于 2020-12-04 17:47:56
作者 | 林昱(苏河) 来源| 阿里巴巴云原生公众号 技术的成熟度源自大规模的实践，在 Java 领域，阿里将自身的实践源源不断的反哺给微服务技术体系；在 Node.js 领域，阿里正掀起了前所未有的前端革命浪潮，将实践反哺给 Serverless 技术体系，并逐渐拓展到其他多语言体系和后端 BaaS 上。 Serverless 云研发平台作为阿里巴巴集团前端委员会发起的一体化云研发平台，底层基于函数计算 FC，是整个 Node Serverless 体系中的研发入口，承接了淘宝、飞猪、ICBU、考拉、高德、文娱等研发、交付和运维工作。目前，集团已经有上千位前端和客户端的工程师使用 Serverless 云研发平台进行业务的开发工作，包括但不限于营销导购、中后台、行业前台等规模化场景。 从今年 双11 整体的大盘数据来看， 仅淘系 Node Serverless 的支撑流量就已经从去年的 2K QPS 峰值增加到今年的 30K QPS 峰值，峰值流量增加了近 15 倍，集团整体更加是从近 5.8K QPS 到达今年的 50K QPS 峰值。 解决方案上，我们定制了面向更多场景的能力，包括考拉 Dart 解决方案的落地，以及一些面向导购的模型驱动解决方案；运维上，我们优化了大促态和日常态流程，让开发者在应对更高 QPS 规模时，精力花费降低至少 50%；在研发体验侧，打造解决方案体系
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