How can I detect the new line in String value?-CodePudding

I have simple TextField widget that auto expands to a new line if the string width was almost near of max screen width.

Here is the code:

  TextEditingController textController  = TextEditingController();
    TextField(
      controller: textController,
      textInputAction: TextInputAction.done,
      maxLines:null ,
      expands: true,
      maxLength: 200,
    )

Question: How can I detect the new line in textController.text?

E.g., we have the following sentence:

The universe is the greatest mystery known to the
human race

Notice that between 'the' and 'human' there is a new line.

I tried to output textController.text but there was nothing found like \n because the new line comes based on UI rendering.

How do I know that in code?

CodePudding user response：

i found solution

by providing globalKey to the textField widget and listen to the it's height state . if there was change of the height so that's mean new line occurs

CodePudding user response：

The simplest way to detect new line:

onChange: (value) {
  if(value.endWith('\n')) {
     //your code 
   }
}