setSelectedRotation method
Sets all selected objects to degrees rotation.
Implementation
bool setSelectedRotation(double degrees) {
if (_selectedObjectIds.isEmpty) return false;
_remember();
final changed = <CanvasObject>[];
for (final id in _selectedObjectIds) {
final index = _objects.indexWhere((object) => object.id == id);
if (index < 0) continue;
if (_objects[index].locked) continue;
final rotated = _rotateObject(_objects[index], degrees);
_objects[index] = rotated;
changed.add(rotated);
}
if (changed.isEmpty) return false;
render();
onRotate?.call(List.unmodifiable(changed));
_emitChange();
return true;
}