insert method

void insert(
  1. String s
)

Implementation

void insert(String s) {
  if (s.isEmpty) return;
  TextEditingValue v = this.value;
  if (this.text.isEmpty) {
    this.value = TextEditingValue(
      text: s,
      selection: TextSelection.collapsed(offset: s.length),
    );
    return;
  }
  String oldText = this.text;
  TextSelection old = v.selection;
  if (old.isValid && old.isNormalized) {
    String newText = old.textBefore(oldText) + s + old.textAfter(oldText);
    int newStart = old.start + s.length;
    this.value = TextEditingValue(
      text: newText,
      selection: TextSelection.collapsed(offset: newStart),
    );
  }
}