statelesswidget

How to tell flutter widget that keyboard doesnt change screen size

由 荒凉一梦 提交于 2021-01-29 08:20:04
问题 I was looking for a way to split my background in my flutter application using a wave, and I found this piece of code: Design a background from 2 images in flutter It works perfectly, and I could adapt it to my needs. The only thing I don't understand is that every time I open my keyboard and type something into an input field, the wave is recalculated. I thought if I used a StatelessWidget, that wouldn't happen. Does anyone have an idea how I can fix this problem? Thank you very much. 来源：

Do stateless widgets dispose on their own?

由 最后都变了- 提交于 2020-07-06 09:55:13
问题 I created a PostUpdaterWidget extending StatelessWidget which makes use of TextEditingControllers for testing out implementation of Bloc Pattern. final _usernameController = TextEditingController(); final _contentController = TextEditingController(); @override Widget build(BuildContext context) { return Column( crossAxisAlignment: CrossAxisAlignment.center, children: <Widget>[ TextField( controller: _usernameController, decoration: InputDecoration(hintText: "Post Username"), ), TextField(

StatelessWidget vs a function returning Widgets in terms of performance

由 半腔热情 提交于 2020-06-10 04:09:12
问题 Is there any difference, performance wise, in using a StatelessWidget vs a function returning a Widget ? I'm well aware of at least the differences pointed out in this flutter's repo issue which don't have a relationship with performance. The fact is that I have some colleagues claiming that functional widgets are worst in terms of performance but after reading a little bit about the subject I cannot find any conclusive piece of documentation that can give credit to that assertion so any kind

StatelessWidget vs a function returning Widgets in terms of performance

由 匆匆过客 提交于 2020-06-10 04:08:17
问题 Is there any difference, performance wise, in using a StatelessWidget vs a function returning a Widget ? I'm well aware of at least the differences pointed out in this flutter's repo issue which don't have a relationship with performance. The fact is that I have some colleagues claiming that functional widgets are worst in terms of performance but after reading a little bit about the subject I cannot find any conclusive piece of documentation that can give credit to that assertion so any kind

Flutter: Mutable fields in stateless widgets

由 ↘锁芯ラ 提交于 2020-05-29 08:25:57
问题 The class StatelessWidget is marked as immutable . However, I am using the scoped model , which means that I avoid StatefulWidget and use the model to alter state in StatelessWidget . This leads to me having non-final fields in StatelessWidget , which doesn't cause errors , because it's just a warning . But I wondered if there is a better way? 回答1: Stateless widgets should only have final fields, with no exceptions . Reason: When the parent widget is rebuilt for some reason (screen rotation,

Flutter: StatelessWidget.build called multiple times [duplicate]

由 折月煮酒 提交于 2019-12-19 07:27:05
问题 This question already has an answer here : How to deal with unwanted widget build? (1 answer) Closed 8 months ago . I always put code in my questions here, but this time it's not possible since the bug could be anywhere in a thousand lines of code. However: I noticed that the build method of my main screen ( StatelessWidget ), which is a descendant of a MaterialApp (home property), get's as usual called once while in debug mode but three times when in release mode. Under which circumstances

Flutter: StatelessWidget.build called multiple times [duplicate]

由 ≯℡__Kan透↙ 提交于 2019-12-19 07:27:05
问题 This question already has an answer here : How to deal with unwanted widget build? (1 answer) Closed 8 months ago . I always put code in my questions here, but this time it's not possible since the bug could be anywhere in a thousand lines of code. However: I noticed that the build method of my main screen ( StatelessWidget ), which is a descendant of a MaterialApp (home property), get's as usual called once while in debug mode but three times when in release mode. Under which circumstances

Flutter: StatelessWidget.build called multiple times [duplicate]

由 牧云@^-^@ 提交于 2019-12-01 05:21:10
This question already has an answer here: How to deal with unwanted widget build? 1 answer I always put code in my questions here, but this time it's not possible since the bug could be anywhere in a thousand lines of code. However: I noticed that the build method of my main screen ( StatelessWidget ), which is a descendant of a MaterialApp (home property), get's as usual called once while in debug mode but three times when in release mode. Under which circumstances could such a thing happen? I already tried reproducing multiple times, but failed. EDIT: The problem is that I am storing the

What is the relation between stateful and stateless widgets in Flutter?

由 僤鯓⒐⒋嵵緔 提交于 2019-11-29 20:34:21
A stateful widget is defined as any widget which changes its state within its lifetime. But it is a very common practice for a StatelessWidget to have a StatefulWidget as one of its children. Doesn't StatelessWidget become stateful if it has StatefulWidget as one of its children? I tried looking into the documentation as part of the code of StatelessWidget , but couldn't figure out how a StatelessWidget can have Statefulwidget as its children and still remain StatelessWidget . What is the relation and difference between stateful and stateless widgets in Flutter? A StatelessWidget will never

What is the relation between stateful and stateless widgets in Flutter?

由 点点圈 提交于 2019-11-27 09:56:30
问题 A stateful widget is defined as any widget which changes its state within its lifetime. But it is a very common practice for a StatelessWidget to have a StatefulWidget as one of its children. Doesn't StatelessWidget become stateful if it has StatefulWidget as one of its children? I tried looking into the documentation as part of the code of StatelessWidget , but couldn't figure out how a StatelessWidget can have Statefulwidget as its children and still remain StatelessWidget . What is the
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