Optional delegate for building the text selection handles and toolbar.
The EditableText widget used on its own will not trigger the display of the selection toolbar by itself. The toolbar is shown by calling EditableTextState.showToolbar in response to an appropriate user event.
- CupertinoTextField, which wraps an EditableText and which shows the selection toolbar upon user events that are appropriate on the iOS platform.
- TextField, a Material Design themed wrapper of EditableText, which shows the selection toolbar upon appropriate user events based on the user's platform set in ThemeData.platform.
final TextSelectionControls selectionControls