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How to set final variable with setter

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0

So I'm new to Dart and Flutter and im trying to set the color of a material depending on a specific string value passed in using a switch statement like so

class AnswerButton extends StatelessWidget

 final String _option;
 final String _answer;
 final VoidCallback _onTap;
 final Color _color = null;

 set _color(_option)
 switch (_option)
 case "A": 
 _color = Colors.greenAccent;
 break;

 case 'B': 
 _color = Colors.redAccent;
 break;

 case 'C': 
 _color = Colors.blueAccent;
 break;

 case 'D': 
 _color = Colors.yellowAccent;
 break;
 
 

 AnswerButton(this._option, this._answer, this._onTap); 

 @override
 Widget build(BuildContext context)
 return new Expanded(
 child: new Material(
 color: _color,
 child: new InkWell(
 onTap: () => _onTap(), 
 child: new Center(
 child: new Container(
 decoration: new BoxDecoration(
 border: new Border.all(color: Colors.white, width: 5.0)
 ),
 padding: new EdgeInsets.all(20.0),
 child: new Text(_answer.toString(),
 style: new TextStyle(color: Colors.white, fontSize: 40.0, fontStyle: FontStyle.italic),),
 ),
 ),
 ),
 )
 );
 

)

but I am running into trouble as I'm not sure how to call the setter method to update _colour and the material is still white

dart flutter

share|improve this question

edited Mar 23 at 4:29

Mitch Q

asked Mar 23 at 2:25

Mitch QMitch Q

14

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  you should call setState() method
  
  – Rubens Melo
  Mar 23 at 3:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the reply I am doing this when I am creating an object I am not trying to update the color at runtime
  
  – Mitch Q
  Mar 23 at 4:39
  

  
  
  
  

add a comment | 

0

So I'm new to Dart and Flutter and im trying to set the color of a material depending on a specific string value passed in using a switch statement like so

class AnswerButton extends StatelessWidget

 final String _option;
 final String _answer;
 final VoidCallback _onTap;
 final Color _color = null;

 set _color(_option)
 switch (_option)
 case "A": 
 _color = Colors.greenAccent;
 break;

 case 'B': 
 _color = Colors.redAccent;
 break;

 case 'C': 
 _color = Colors.blueAccent;
 break;

 case 'D': 
 _color = Colors.yellowAccent;
 break;
 
 

 AnswerButton(this._option, this._answer, this._onTap); 

 @override
 Widget build(BuildContext context)
 return new Expanded(
 child: new Material(
 color: _color,
 child: new InkWell(
 onTap: () => _onTap(), 
 child: new Center(
 child: new Container(
 decoration: new BoxDecoration(
 border: new Border.all(color: Colors.white, width: 5.0)
 ),
 padding: new EdgeInsets.all(20.0),
 child: new Text(_answer.toString(),
 style: new TextStyle(color: Colors.white, fontSize: 40.0, fontStyle: FontStyle.italic),),
 ),
 ),
 ),
 )
 );
 

)

but I am running into trouble as I'm not sure how to call the setter method to update _colour and the material is still white

dart flutter

share|improve this question

edited Mar 23 at 4:29

Mitch Q

asked Mar 23 at 2:25

Mitch QMitch Q

14

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  you should call setState() method
  
  – Rubens Melo
  Mar 23 at 3:39
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the reply I am doing this when I am creating an object I am not trying to update the color at runtime
  
  – Mitch Q
  Mar 23 at 4:39
  

  
  
  
  

add a comment | 

So I'm new to Dart and Flutter and im trying to set the color of a material depending on a specific string value passed in using a switch statement like so

class AnswerButton extends StatelessWidget

 final String _option;
 final String _answer;
 final VoidCallback _onTap;
 final Color _color = null;

 set _color(_option)
 switch (_option)
 case "A": 
 _color = Colors.greenAccent;
 break;

 case 'B': 
 _color = Colors.redAccent;
 break;

 case 'C': 
 _color = Colors.blueAccent;
 break;

 case 'D': 
 _color = Colors.yellowAccent;
 break;
 
 

 AnswerButton(this._option, this._answer, this._onTap); 

 @override
 Widget build(BuildContext context)
 return new Expanded(
 child: new Material(
 color: _color,
 child: new InkWell(
 onTap: () => _onTap(), 
 child: new Center(
 child: new Container(
 decoration: new BoxDecoration(
 border: new Border.all(color: Colors.white, width: 5.0)
 ),
 padding: new EdgeInsets.all(20.0),
 child: new Text(_answer.toString(),
 style: new TextStyle(color: Colors.white, fontSize: 40.0, fontStyle: FontStyle.italic),),
 ),
 ),
 ),
 )
 );
 

)

but I am running into trouble as I'm not sure how to call the setter method to update _colour and the material is still white

dart flutter

share|improve this question

edited Mar 23 at 4:29

Mitch Q

asked Mar 23 at 2:25

Mitch QMitch Q

14

class AnswerButton extends StatelessWidget

 final String _option;
 final String _answer;
 final VoidCallback _onTap;
 final Color _color = null;

 set _color(_option)
 switch (_option)
 case "A": 
 _color = Colors.greenAccent;
 break;

 case 'B': 
 _color = Colors.redAccent;
 break;

 case 'C': 
 _color = Colors.blueAccent;
 break;

 case 'D': 
 _color = Colors.yellowAccent;
 break;
 
 

 AnswerButton(this._option, this._answer, this._onTap); 

 @override
 Widget build(BuildContext context)
 return new Expanded(
 child: new Material(
 color: _color,
 child: new InkWell(
 onTap: () => _onTap(), 
 child: new Center(
 child: new Container(
 decoration: new BoxDecoration(
 border: new Border.all(color: Colors.white, width: 5.0)
 ),
 padding: new EdgeInsets.all(20.0),
 child: new Text(_answer.toString(),
 style: new TextStyle(color: Colors.white, fontSize: 40.0, fontStyle: FontStyle.italic),),
 ),
 ),
 ),
 )
 );
 

)

dart flutter

dart flutter

share|improve this question

edited Mar 23 at 4:29

Mitch Q

asked Mar 23 at 2:25

Mitch QMitch Q

14

share|improve this question

edited Mar 23 at 4:29

Mitch Q

asked Mar 23 at 2:25

Mitch QMitch Q

14

asked Mar 23 at 2:25

Mitch QMitch Q

14

asked Mar 23 at 2:25

Mitch QMitch Q

14

1 Answer
1

active

oldest

votes

0

First there's a small typo you have to fix.Your are trying to set the value of color instead of your final variable _color according to the official dart documentation:

 set color(_option)
 

To:

 set _color(_option)
 

Another thing is Material widget color won't be shown unless there's a child defined, you'll notice it when you use:

 new Material(
 color: _color,
 child: Text(''), // or any other widget you want to implement
 ) 

share|improve this answer

answered Mar 23 at 3:50

Mazin IbrahimMazin Ibrahim

1,5802817

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the reply, I fixed my copy paste error thanks for that, also I edited my question to include the complete file I omitted what I didn't think was pertinent. I have defined a child in the material, I am just not sure how to call the set method so that when i assign _color to the material it is green for example
  
  – Mitch Q
  Mar 23 at 4:37
  
  

  
  
  
  

add a comment | 

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0

First there's a small typo you have to fix.Your are trying to set the value of color instead of your final variable _color according to the official dart documentation:

 set color(_option)
 

To:

 set _color(_option)
 

Another thing is Material widget color won't be shown unless there's a child defined, you'll notice it when you use:

 new Material(
 color: _color,
 child: Text(''), // or any other widget you want to implement
 ) 

share|improve this answer

answered Mar 23 at 3:50

Mazin IbrahimMazin Ibrahim

1,5802817

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the reply, I fixed my copy paste error thanks for that, also I edited my question to include the complete file I omitted what I didn't think was pertinent. I have defined a child in the material, I am just not sure how to call the set method so that when i assign _color to the material it is green for example
  
  – Mitch Q
  Mar 23 at 4:37
  
  

  
  
  
  

add a comment | 

0

First there's a small typo you have to fix.Your are trying to set the value of color instead of your final variable _color according to the official dart documentation:

 set color(_option)
 

To:

 set _color(_option)
 

Another thing is Material widget color won't be shown unless there's a child defined, you'll notice it when you use:

 new Material(
 color: _color,
 child: Text(''), // or any other widget you want to implement
 ) 

share|improve this answer

answered Mar 23 at 3:50

Mazin IbrahimMazin Ibrahim

1,5802817

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Thanks for the reply, I fixed my copy paste error thanks for that, also I edited my question to include the complete file I omitted what I didn't think was pertinent. I have defined a child in the material, I am just not sure how to call the set method so that when i assign _color to the material it is green for example
  
  – Mitch Q
  Mar 23 at 4:37
  
  

  
  
  
  

add a comment | 

First there's a small typo you have to fix.Your are trying to set the value of color instead of your final variable _color according to the official dart documentation:

 set color(_option)
 

To:

 set _color(_option)
 

Another thing is Material widget color won't be shown unless there's a child defined, you'll notice it when you use:

 new Material(
 color: _color,
 child: Text(''), // or any other widget you want to implement
 ) 

share|improve this answer

answered Mar 23 at 3:50

Mazin IbrahimMazin Ibrahim

1,5802817

 set color(_option)
 

 set _color(_option)
 

 new Material(
 color: _color,
 child: Text(''), // or any other widget you want to implement
 ) 

share|improve this answer

answered Mar 23 at 3:50

Mazin IbrahimMazin Ibrahim

1,5802817

answered Mar 23 at 3:50

Mazin IbrahimMazin Ibrahim

1,5802817

answered Mar 23 at 3:50

Mazin IbrahimMazin Ibrahim

1,5802817