updateEditingValue method

@override void updateEditingValue(TextEditingValue value)

Requests that this client update its editing state to the given value.

The new value is treated as user input and thus may subject to input formatting.

Implementation

@override
void updateEditingValue(TextEditingValue value) {
  if (!shouldCreateInputConnection) {
    return;
  }

  if (_lastKnownRemoteTextEditingValue == value) {
    // There is no difference between this value and the last known value.
    return;
  }

  // Check if only composing range changed.
  if (_lastKnownRemoteTextEditingValue!.text == value.text &&
      _lastKnownRemoteTextEditingValue!.selection == value.selection) {
    // This update only modifies composing range. Since we don't keep track
    // of composing range we just need to update last known value here.
    // This check fixes an issue on Android when it sends
    // composing updates separately from regular changes for text and
    // selection.
    _lastKnownRemoteTextEditingValue = value;
    return;
  }

  final effectiveLastKnownValue = _lastKnownRemoteTextEditingValue!;
  _lastKnownRemoteTextEditingValue = value;
  final oldText = effectiveLastKnownValue.text;
  final text = value.text;
  final cursorPosition = value.selection.extentOffset;
  final diff = getDiff(oldText, text, cursorPosition);
  if (diff.deleted.isEmpty && diff.inserted.isEmpty) {
    widget.configurations.controller
        .updateSelection(value.selection, ChangeSource.local);
  } else {
    widget.configurations.controller.replaceText(
      diff.start,
      diff.deleted.length,
      diff.inserted,
      value.selection,
    );
  }
}