1-) FLUTTER - Select all text inside TextFormField when it gets focus

1- KOD

onTap: () => txtTip.selection = TextSelection(baseOffset: 0, extentOffset: txtTip.value.text.length),

2-) TAM KOD

TextEditingController txtTip = new TextEditingController(text: "0");

TextFormField(
  controller: txtTip,
  onTap: () => txtTip.selection = TextSelection(baseOffset: 0, extentOffset: txtTip.value.text.length),
  ),

3- kaynak

https://stackoverflow.com/questions/52344848/select-all-text-inside-textfield-when-it-gets-focus