SnapToGrid on multiple items

[Alundra]

Hi all,
I have implemented the snap to grid on the QGraphicsItem but sometimes one item move and other doesn't when multi selected.
Here the code I use to snap to grid inside itemChange of QGraphicsItem :

case ItemPositionChange :
{
	// Get the scene.
	QGraphicsScene* Scene = scene();
 
	// Check if the scene is invalid.
	if( Scene == NULL )
	    break;
 
	// Cast the scene.
	CEditorNodeScene* NodeScene = static_cast< CEditorNodeScene* >( Scene );
 
	// Get the grid step.
	const qreal GridStep = static_cast< qreal >( NodeScene->GetGridStep() );
 
	// Snap to grid.
	QPointF NewPos = value.toPointF();
	NewPos.setX( NewPos.x() - fmod( NewPos.x(), GridStep ) );
	NewPos.setY( NewPos.y() - fmod( NewPos.y(), GridStep ) );
	return NewPos;
}

case ItemPositionChange :
{
	// Get the scene.
	QGraphicsScene* Scene = scene();

	// Check if the scene is invalid.
	if( Scene == NULL )
	    break;

	// Cast the scene.
	CEditorNodeScene* NodeScene = static_cast< CEditorNodeScene* >( Scene );

	// Get the grid step.
	const qreal GridStep = static_cast< qreal >( NodeScene->GetGridStep() );

	// Snap to grid.
	QPointF NewPos = value.toPointF();
	NewPos.setX( NewPos.x() - fmod( NewPos.x(), GridStep ) );
	NewPos.setY( NewPos.y() - fmod( NewPos.y(), GridStep ) );
	return NewPos;
}

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Thanks for the help