canSelectAll method Null safety

  1. @override
bool canSelectAll(
  1. TextSelectionDelegate delegate

Whether the current selection of the text field managed by the given delegate can be extended to include the entire content of the text field.

Subclasses can use this to decide if they should expose the select all functionality to the user.


bool canSelectAll(TextSelectionDelegate delegate) {
  // Android allows SelectAll when selection is not collapsed, unless
  // everything has already been selected.
  final TextEditingValue value = delegate.textEditingValue;
  return delegate.selectAllEnabled &&
         value.text.isNotEmpty &&
         !(value.selection.start == 0 && value.selection.end == value.text.length);