updateFloatingCursor method

@override void updateFloatingCursor(RawFloatingCursorPoint point)

Updates the floating cursor position and state.

See also:

• FloatingCursorDragState, which explains the floating cursor feature in detail.

Implementation

@override
void updateFloatingCursor(RawFloatingCursorPoint point) {
  switch (point.state) {
    case FloatingCursorDragState.Start:
      if (floatingCursorResetController.isAnimating) {
        floatingCursorResetController.stop();
        onFloatingCursorResetTick();
      }
      // We want to send in points that are centered around a (0,0) origin, so
      // we cache the position.
      _pointOffsetOrigin = point.offset;

      final currentTextPosition =
          TextPosition(offset: renderEditor.selection.baseOffset);
      _startCaretRect =
          renderEditor.getLocalRectForCaret(currentTextPosition);

      _lastBoundedOffset = _startCaretRect!.center -
          _floatingCursorOffset(currentTextPosition);
      _lastTextPosition = currentTextPosition;
      renderEditor.setFloatingCursor(
          point.state, _lastBoundedOffset!, _lastTextPosition!);
      break;
    case FloatingCursorDragState.Update:
      assert(_lastTextPosition != null, 'Last text position was not set');
      final floatingCursorOffset = _floatingCursorOffset(_lastTextPosition!);
      final centeredPoint = point.offset! - _pointOffsetOrigin!;
      final rawCursorOffset =
          _startCaretRect!.center + centeredPoint - floatingCursorOffset;

      final preferredLineHeight =
          renderEditor.preferredLineHeight(_lastTextPosition!);
      _lastBoundedOffset = renderEditor.calculateBoundedFloatingCursorOffset(
        rawCursorOffset,
        preferredLineHeight,
      );
      _lastTextPosition = renderEditor.getPositionForOffset(renderEditor
          .localToGlobal(_lastBoundedOffset! + floatingCursorOffset));
      renderEditor.setFloatingCursor(
          point.state, _lastBoundedOffset!, _lastTextPosition!);
      final newSelection = TextSelection.collapsed(
          offset: _lastTextPosition!.offset,
          affinity: _lastTextPosition!.affinity);
      // Setting selection as floating cursor moves will have scroll view
      // bring background cursor into view
      renderEditor.onSelectionChanged(
          newSelection, SelectionChangedCause.forcePress);
      break;
    case FloatingCursorDragState.End:
      // We skip animation if no update has happened.
      if (_lastTextPosition != null && _lastBoundedOffset != null) {
        floatingCursorResetController
          ..value = 0.0
          ..animateTo(1,
              duration: _floatingCursorResetTime, curve: Curves.decelerate);
      }
      break;
  }
}