updateFloatingCursor method
Updates the floating cursor position and state.
See also:
- FloatingCursorDragState, which explains the floating cursor feature in detail.
Implementation
@override
void updateFloatingCursor(RawFloatingCursorPoint point) {
_floatingCursorResetController ??= AnimationController(
vsync: this,
)..addListener(_onFloatingCursorResetTick);
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 TextPosition currentTextPosition =
TextPosition(offset: renderEditable.selection!.baseOffset);
_startCaretRect =
renderEditable.getLocalRectForCaret(currentTextPosition);
_lastBoundedOffset = _startCaretRect!.center - _floatingCursorOffset;
_lastTextPosition = currentTextPosition;
renderEditable.setFloatingCursor(
point.state, _lastBoundedOffset!, _lastTextPosition!);
break;
case FloatingCursorDragState.Update:
final Offset centeredPoint = point.offset! - _pointOffsetOrigin!;
final Offset rawCursorOffset =
_startCaretRect!.center + centeredPoint - _floatingCursorOffset;
_lastBoundedOffset = renderEditable
.calculateBoundedFloatingCursorOffset(rawCursorOffset);
_lastTextPosition = renderEditable.getPositionForPoint(renderEditable
.localToGlobal(_lastBoundedOffset! + _floatingCursorOffset));
renderEditable.setFloatingCursor(
point.state, _lastBoundedOffset!, _lastTextPosition!);
break;
case FloatingCursorDragState.End:
// We skip animation if no update has happened.
if (_lastTextPosition != null && _lastBoundedOffset != null) {
_floatingCursorResetController!.value = 0.0;
_floatingCursorResetController!.animateTo(1.0,
duration: _floatingCursorResetTime, curve: Curves.decelerate);
}
break;
}
}