/// <summary>
/// What happens when we release the mouse button
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void CurrentEditor_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
CurrentEditor.ReleaseMouseCapture();
CurrentStatus = "";
if (IsDrawing)
{
var newAtomPos = e.GetPosition(CurrentEditor);
//first get the current active visuals
var landedGroupVisual = CurrentEditor.GetTargetedVisual(newAtomPos) as GroupVisual;
var landedAtomVisual = CurrentEditor.GetTargetedVisual(newAtomPos) as AtomVisual;
var landedBondVisual = CurrentEditor.GetTargetedVisual(newAtomPos) as BondVisual;
//check to see whether or not we've clicked and released on the same atom
bool sameAtom = landedAtomVisual == _currentAtomVisual;
//check to see whether the target is in the same molecule
bool sameMolecule = landedAtomVisual?.ParentAtom.Parent == _currentAtomVisual?.ParentAtom.Parent;
if (landedGroupVisual != null)
{
ClearTemporaries();
return;
}
//check bonds first - we can't connect to a bond so we need to simply do some stuff with it
if (landedBondVisual != null)
{
//clicking on a stereo bond should just invert it
var parentBond = landedBondVisual.ParentBond;
if (parentBond.Stereo == BondStereo.Hatch &
EditViewModel.CurrentStereo == BondStereo.Hatch |
parentBond.Stereo == BondStereo.Wedge &
EditViewModel.CurrentStereo == BondStereo.Wedge)
{
EditViewModel.SwapBondDirection(parentBond);
}
else
{
//modify the bond attribute (order, stereo, whatever's selected really)
EditViewModel.SetBondAttributes(parentBond);
}
}
else //we clicked on empty space or an atom
{
Atom parentAtom = _currentAtomVisual?.ParentAtom;
if (landedAtomVisual == null) //no atom hit
{
if (parentAtom != null)
{
if (_currentAtomVisual != null)
{
//so just sprout a chain off it at two-o-clock
EditViewModel.AddAtomChain(
parentAtom, _angleSnapper.SnapBond(newAtomPos, e),
ClockDirections.II);
}
else
{
//otherwise create a singleton
EditViewModel.AddAtomChain(null, newAtomPos, ClockDirections.II);
}
}
else
{
//create a singleton
//otherwise create a singleton
EditViewModel.AddAtomChain(null, newAtomPos, ClockDirections.II);
}
}
else //we went mouse-up on an atom
{
Atom lastAtom = landedAtomVisual.ParentAtom;
if (sameAtom) //both are the same atom
{
if (lastAtom.Element.Symbol != EditViewModel.SelectedElement.Symbol)
{
EditViewModel.SetElement(EditViewModel.SelectedElement, new List <Atom> {
lastAtom
});
}
else
{
var atomMetrics = GetNewChainEndPos(landedAtomVisual);
EditViewModel.AddAtomChain(lastAtom, atomMetrics.NewPos, atomMetrics.sproutDir);
parentAtom.UpdateVisual();
}
}
else //we must have hit a different atom altogether
{
if (parentAtom != null)
{
//already has a bond to the target atom
var existingBond = parentAtom.BondBetween(lastAtom);
if (existingBond != null) //it must be in the same molecule
{
EditViewModel.IncreaseBondOrder(existingBond);
}
else //doesn't have a bond to the target atom
{
if (sameMolecule)
{
EditViewModel.AddNewBond(parentAtom, lastAtom, parentAtom.Parent);
}
else
{
EditViewModel.JoinMolecules(parentAtom, lastAtom,
EditViewModel.CurrentBondOrder,
EditViewModel.CurrentStereo);
}
parentAtom.UpdateVisual();
lastAtom.UpdateVisual();
}
}
}
}
}
}
ClearTemporaries();
}