Recent questions tagged DART

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dart - How to fix wrong rotation of photo from camera in flutter?

I'm taking a photo with the newest camera plugin version and I'm using code from flutter example. This is how ... correct? (Even on ios devices) See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter: Show different icons based on value

I have a list of objects each with an icon property as shown here: List<Map<String, String>> _categories = [ { 'name': ' ... ], ), ), ), ); } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - FLUTTER How to get variable based on passed string name?

I have stored variables in a class with their code names. Suppose I want to get XVG from that class, I ... provide me with a better solution? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Is it possible to create a Polymer element without Html?

My final objective is don't have to write HTML like this: <div id='counter'> {{counter}} </div> < ... has been bound with its observable. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - dependOnInheritedElement() was called before initstate() in flutter

I am currently having an issue while fetching a Provider' value ininitstate`. I want to set a default ... _selectedButton = _buttons.first; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - flutter : Get Local position of Gesture Detector

i have problems to get real local position on gesture detector widget using pan update here is my sample code ... missed to get local position. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Could not find the correct Provider - Flutter

@override Widget build(BuildContext context) { return WillPopScope( onWillPop: () async { return false; }, child: ... context` is being used. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter Isolate vs Future

I might have the wrong idea of Isolate and Future. Please help me to clear it up. Here is my understanding ... on the main isolate queue. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - flutter : Get Local position of Gesture Detector

i have problems to get real local position on gesture detector widget using pan update here is my sample code ... missed to get local position. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Could not find the correct Provider - Flutter

@override Widget build(BuildContext context) { return WillPopScope( onWillPop: () async { return false; }, child: ... context` is being used. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter Isolate vs Future

I might have the wrong idea of Isolate and Future. Please help me to clear it up. Here is my understanding ... on the main isolate queue. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - What does the exclamation mark mean before a function call?

I was following a PR for Flutter and came across this code: if (chunkCallback != null) { chunkCallback!(0, ... Nothing I search on Google works. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How do I cancel Future.delayed?

How can I cancel/stop a Future.delayed? I read this other question: how can i cancel Future.delayed function ... ); jumpToNextQuestion(); }); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter show and hide container on scrolling ListView

How can I show a Container with animation on scrolling ListView down and hide it when scrolling up. The video I ... the index of the ListView. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How to check first time app launch in Flutter

I am a beginner in a flutter, I have created my application but I want to check if the user opens the application for the ... )), ], ), ); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter Provider Nested Objects

I'm using the Provider Package to manage state in my Flutter App. I am running into issues when I start ... a better architecture and designs. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter- ExpansionTile expand and collapse on click

I am taking this as a reference to expanding and collapsing of expansion tile-------Flutter - Collapsing ExpansionTile ... .children), ); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter: Using NumberFormat in TextInputFormatter

I'm trying to use NumberFromatter in TextInputFormatter but when I try to use it, it completely messed up! This ... anyone helps me with this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Pass method as parameter to a widget

I have a custom button widget: class Button extends StatelessWidget { final String text; Button(this.text); ... the myMethod for onPress? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How do I open an external url in flutter web in new tab or in same tab

I have a simple web app I have created with flutter web. I would like to know how I can open new ... https://stackoverflow.com/questions/ask See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How to get widget's absolute coordinates on a screen in Flutter?

How to get widget's absolute coordinates on a screen in Flutter? Or its offset in a parent Example: ... , without hardcoded values Thanks See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How to connect flutter to localhost mysql database

I want to connect a localhost mysql db to flutter but I'm failing to do so. I tried mysql1 with these ... I am not using an emulator. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How to Calculate the Coordinates of touch in Flutter?

I want show a popup at touch Coordinates. I am using Stack and Positioned widgets to place the popup. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How to specify dependency_overrides in pubspec.yaml?

I am working with latest version of angular.dart and my pubspec.yaml looks somewhat like this: name: angularApp ... on angular for my app? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - Flutter Stream Builder Triggered when Navigator Pop or Push is Called

I have a stream builder in the app's home/root page. This stream builder gets triggered whenever I do a page- ... 22339): Building sign-in page. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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2.0k views

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dart - How to get progress event while uploading file on http.MultipartRequest request in flutter

I am uploading a file using MultipartRequest from package:http. I am successfully uploading the file but I want ... path. Help is appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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dart - Arc gradients in Flutter?

I have a Paint object and I'm trying to use it to paint an Arc Gradient using canvas.drawArc, but the only way ... ; canvas.drawArc(..., paint); See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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dart - How to read and write a text file in Flutter

How do you read text from a file and write text to a file? I've been learning about how to read and ... what I learned from the documentation. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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