startOffset property

int startOffset
final

The start of the selection relative to the start of the content.

For example a Text widget's content is in the format of an TextSpan tree.

Take the Text widget and TextSpan tree below:

link 
const Text.rich(
  TextSpan(
    text: 'Hello world, ',
    children: <InlineSpan>[
      WidgetSpan(
        child: Text('how are you today? '),
      ),
      TextSpan(
        text: 'Good, thanks for asking.',
      ),
    ],
  ),
)

If we select from the beginning of 'world' to the end of the '.' at the end of the TextSpan tree, the SelectedContentRange from SelectionHandler.getSelection will be relative to the text of the TextSpan tree, with WidgetSpan content being flattened. The startOffset will be 6, and endOffset will be 56. This takes into account the length of the content in the WidgetSpan, which is 19, making the overall length of the content 56.

Implementation

final int startOffset;