public override void MouseDown(object sender, MouseButtonEventArgs e)
{
#if !SILVERLIGHT
if (e.ClickCount == 2)
{
Drawing.CoordinateSystem.ZoomExtend();
return;
}
#endif
offsetFromFigureLeftTopCorner = Coordinates(e, false, false, false);
oldCoordinates = offsetFromFigureLeftTopCorner;
coordinatesOnMouseDown = offsetFromFigureLeftTopCorner;
startedMoving = false;
moving = new List <IMovable>();
IEnumerable <IFigure> roots = null;
bool isLocked = false;
found = Drawing.Figures.HitTest(offsetFromFigureLeftTopCorner);
IMovable oneMovable = found as IMovable;
if (oneMovable != null && (found.Locked || oneMovable.AllowMove()))
{
if (found.Locked)
{
isLocked = true;
}
else if (oneMovable.AllowMove())
{
if (oneMovable is IPoint)
{
// when we drag a point, we want it to snap to the cursor
// so that the point center is directly under the tip of the mouse
offsetFromFigureLeftTopCorner = new Point();
oldCoordinates = oneMovable.Coordinates;
}
else
{
// however when we drag other stuff (such as text labels)
// we want the mouse to always touch the part of the draggable
// where it first touched during MouseDown
// we don't want the draggable to "snap" to the cursor like points do
offsetFromFigureLeftTopCorner = offsetFromFigureLeftTopCorner.Minus(oneMovable.Coordinates);
}
roots = DependencyAlgorithms.FindRoots(f => f.Dependents, found);
if (roots.All(root => (!root.Locked)))
{
moving.Add(oneMovable);
roots = found.AsEnumerable();
}
else
{
isLocked = true;
}
}
}
else if (found != null)
{
if (!found.Locked)
{
roots = DependencyAlgorithms.FindRoots(f => f.Dependencies, found);
if (roots.All(root => root is IMovable))
{
if (roots.All(root => ((IMovable)root).AllowMove()))
{
moving.AddRange(roots.OfType <IMovable>());
}
else
{
isLocked = true;
}
}
}
else
{
isLocked = true;
}
}
if (roots != null)
{
toRecalculate = DependencyAlgorithms.FindDescendants(f => f.Dependents, roots);
toRecalculate.Reverse();
}
else
{
toRecalculate = null;
}
if (moving.IsEmpty() && !isLocked && !Drawing.CoordinateGrid.Locked)
{
moving.Add(Drawing.CoordinateSystem);
//var allFigures = Drawing.Figures.GetAllFiguresRecursive();
//roots = DependencyAlgorithms.FindRoots(f => f.Dependencies, allFigures);
//moving.AddRange(roots.OfType<IMovable>());
//roots = null;
toRecalculate = null; // Figures;
}
}