private void SetActiveAdorner(ChemicalVisual value)
{
switch (value)
{
case GroupVisual gv:
_highlightAdorner = new GroupHoverAdorner(this, gv);
break;
case FunctionalGroupVisual fv:
_highlightAdorner = new AtomHoverAdorner(this, fv);
break;
case AtomVisual av:
_highlightAdorner = new AtomHoverAdorner(this, av);
break;
case BondVisual bv:
_highlightAdorner = new BondHoverAdorner(this, bv);
break;
default:
_highlightAdorner = null;
break;
}
}
public ChemicalVisual GetTargetedVisual(Point p)
{
_visuals.Clear();
// Re-Populate _visuals via ResultCallback with *ALL* ChemicalVisual's which are under the mouse cursor
// GroupVisual's seem to be added first (with outermost first) one for each Group
// Next are any BondVisual's one for each Bond
// Next is the AtomVisual for the Atom
VisualTreeHelper.HitTest(this, null, ResultCallback, new PointHitTestParameters(p));
// First try to get a GroupVisual
// HACK: What guarantees that the first one found is the "top level" group?
ChemicalVisual result = _visuals.FirstOrDefault(v => v is GroupVisual);
// If not successful try to get an AtomVisual (should only ever be one!)
if (result == null)
{
result = _visuals.FirstOrDefault(v => v is AtomVisual | v is FunctionalGroupVisual);
}
// Finally get first ChemicalVisual which ought to be a BondVisual
if (result == null)
{
result = _visuals.FirstOrDefault();
}
return(result);
}
private HitTestResultBehavior ResultCallback(HitTestResult result)
{
_visualHit = result.VisualHit as ChemicalVisual;
if (_visualHit != null)
{
_visuals.Add(_visualHit);
}
return(HitTestResultBehavior.Continue);
}
private void CurrentEditor_MouseMove(object sender, MouseEventArgs e)
{
Clashing = false;
CurrentPoint = e.GetPosition(CurrentEditor);
//check to see whether we've dragged off the target first
if (MouseIsDown && IsDrawing)
{
CurrentStatus = "Drag along arrow to size ring: [Esc] to cancel";
double xamlBondSize = EditViewModel.Model.XamlBondLength;
if (Target != null && GetTargetedVisual(e) != Target) //dragging off a bond or atom
{
//first, work out how far we've dragged the mouse
switch (Target)
{
case AtomVisual av:
RingSize = GetRingSize(av, CurrentPoint, xamlBondSize);
IdentifyPlacements(av.ParentAtom, xamlBondSize, out _preferredPlacements, RingSize);
if (_preferredPlacements != null)
{
Vector parallelToBV =
GetProjection(av.ParentAtom.BalancingVector(), av.Position, CurrentPoint);
Point endPoint = av.Position + parallelToBV;
CurrentAdorner = new NRingAdorner(CurrentEditor, EditViewModel.EditBondThickness,
_preferredPlacements, av.Position, endPoint);
}
break;
case BondVisual bv:
RingSize = GetRingSizeFromEdge(bv, CurrentPoint);
Vector perpToBV =
GetProjection(bv.ParentBond.BondVector.Perpendicular(), bv.ParentBond.MidPoint, CurrentPoint);
IdentifyPlacements(bv.ParentBond, out _preferredPlacements, RingSize, perpToBV);
if (_preferredPlacements != null)
{
Vector?perpToAV = bv.ParentBond.GetUncrowdedSideVector();
if (perpToAV != null)
{
var parentBondMidPoint = bv.ParentBond.MidPoint;
Vector parallelToPerp =
GetProjection(perpToAV.Value, parentBondMidPoint, CurrentPoint);
Point endPoint = parentBondMidPoint + parallelToPerp;
CurrentAdorner = new NRingAdorner(CurrentEditor, EditViewModel.EditBondThickness,
_preferredPlacements,
parentBondMidPoint, endPoint);
}
else
{
CurrentAdorner = null;
}
}
else
{
CurrentAdorner = null;
}
break;
}
}
else if (Target == null) //dragging in empty space
{
RingSize = GetRingSize(FirstPoint, CurrentPoint, xamlBondSize);
_preferredPlacements = MarkOutAtoms(FirstPoint, CurrentPoint - FirstPoint,
xamlBondSize, RingSize);
//need to check whether the user is trying to fuse without
//having the pencil directly over the object!
foreach (Point p in _preferredPlacements)
{
ChemicalVisual cv = CurrentEditor.GetTargetedVisual(p);
if (cv != null)
{
//user is trying to fuse wrongly
Clashing = true;
break;
}
}
if (Clashing)
{
CurrentStatus = "Can't draw ring here - drag over atom or bond to draw fused ring";
}
CurrentAdorner = new NRingAdorner(CurrentEditor, EditViewModel.EditBondThickness,
_preferredPlacements, FirstPoint, CurrentPoint, Clashing);
}
else
{
switch (CurrentEditor.ActiveVisual)
{
case AtomVisual av:
CurrentStatus = "Drag from atom to size ring.";
break;
case BondVisual bv:
CurrentStatus = "Drag from bond to size ring.";
break;
default:
CurrentStatus = DefaultStatusText;
break;
}
}
}
}