flutter - 如何在复选框值更改时禁用/只读特定的文本输入字段？

Question

I have a checkbox that I would like to disable a field when it is unchecked. How would I do that? This it the current checkbox code I have so far...

              child: CheckboxListTile(
                title: Text("Auto Calculate Big Blind"),
                value: _autoCalcBigBlind,
                onChanged: (bool value) {
                  setState(() {
                    if (value == false) { //focus on the big blind text field
                      _bigBlindFocusNode.requestFocus();
                    } else {

                      //first check small blind is not null
                      if (_textEditControllerSmallBlind.text == null || _textEditControllerSmallBlind.text == '0'){
                        //if the field is null/0, can't double it, so focus on it
                        _smallBlindFocusNode.requestFocus();
                      }else{  //the big blind value = double the current small blind value. we know small blind field is not null
                        _textEditControllerBigBlind.text = (int.tryParse(_textEditControllerSmallBlind.text) * 2).toString();
                       **//at this point, i want a specific text input field disabled. how to do that?** 
                     }
                    }
                
        

Answer 1

You need to toggle the value of the enabled property of TextFormField or TextField . If the enabled is false it would disable the TextFormField or TextField .

Create bool member such as bool _isTextFieldEnabled = false; in the State class of a StatefulWidget & set _isTextFieldEnabled to true when you want to disable the TextField by calling setState.

Checkout this DartPad sample I created to demonstrate this: DartPad