private bool IsDownstreamOf(ModelElement potentialUpstream, ModelElement child)
{
foreach (ModelElement mEl in ModelElements)
{
ArrowElement mAr = mEl as ArrowElement;
if (mAr != null)
{
if (mAr.StopElement == null)
{
continue;
}
if (mAr.StopElement == child)
{
if (mAr.StartElement == null)
{
continue;
}
if (mAr.StartElement == potentialUpstream)
{
return(true);
}
foreach (ModelElement parents in GetParents(mAr.StartElement))
{
if (IsDownstreamOf(potentialUpstream, parents))
{
return(true);
}
}
return(false);
}
}
}
return(false);
}
private bool IsUpstreamOf(ModelElement potentialDownstream, ModelElement parent)
{
foreach (ModelElement mEl in _modelElements)
{
ArrowElement mAr = mEl as ArrowElement;
if (mAr != null)
{
if (mAr.StartElement == null)
{
continue;
}
if (mAr.StartElement == parent)
{
if (mAr.StopElement == null)
{
continue;
}
if (mAr.StopElement == potentialDownstream)
{
return(true);
}
foreach (ModelElement children in GetChildren(mAr.StartElement))
{
if (IsUpstreamOf(potentialDownstream, children))
{
return(true);
}
}
return(false);
}
}
}
return(false);
}
private List <ModelElement> GetChildren(ModelElement parent)
{
List <ModelElement> listChildren = new List <ModelElement>();
foreach (ModelElement mEl in ModelElements)
{
ArrowElement mAr = mEl as ArrowElement;
if (mAr != null && mAr.StartElement != null && mAr.StartElement == parent)
{
listChildren.Add(mAr.StopElement);
}
}
return(listChildren);
}
private List <ModelElement> GetParents(ModelElement child)
{
List <ModelElement> listParents = new List <ModelElement>();
foreach (ModelElement mEl in ModelElements)
{
ArrowElement mAr = mEl as ArrowElement;
if (mAr != null && mAr.StopElement != null && mAr.StopElement == child)
{
listParents.Add(mAr.StartElement);
}
}
return(listParents);
}
/// <summary>
/// Adds an arrow element given a source and destination element
/// </summary>
/// <param name="sourceElement"></param>
/// <param name="destElement"></param>
private ArrowElement AddArrow(ModelElement sourceElement, ModelElement destElement)
{
ArrowElement ae = new ArrowElement(sourceElement, destElement, _modelElements)
{
Color = _arrowColor,
Name = sourceElement.Name + "_" + destElement.Name
};
AddElement(ae, ae.Location);
return ae;
}
/// <summary>
/// When the user mouses up after a single click this event fires
/// </summary>
/// <param name="e"></param>
protected override void OnMouseUp(MouseEventArgs e)
{
base.OnMouseUp(e);
Point virPt = PixelToVirtual(e.Location);
//If we are in link mode we run this
if (_linkArrow != null)
{
ClearSelectedElements();
ModelElement[] tempElements = new ModelElement[_modelElements.Count];
_modelElements.CopyTo(tempElements);
foreach (ModelElement me in tempElements)
{
if (me.PointInElement(virPt) && me != _linkArrow.StartElement)
{
ToolElement te = me as ToolElement;
if (te != null)
{
//If the user let go over a tool we try to link to to, assuming it doesn't create a loop
if (_linkArrow.StartElement != null)
{
if (_linkArrow.StartElement.IsDownstreamOf(te))
{
//If the tool is the data sets parent
MessageBox.Show(MessageStrings.linkErrorCircle, MessageStrings.linkError, MessageBoxButtons.OK, MessageBoxIcon.Information);
break;
}
}
bool showError = true;
foreach (Parameter t in te.Tool.InputParameters)
{
DataElement linkStart = _linkArrow.StartElement as DataElement;
if (linkStart != null)
{
if (t.DefaultSpecified == false && t.ParamType == linkStart.Parameter.ParamType)
{
AddArrow(linkStart, te);
t.Value = linkStart.Parameter.Value;
t.ModelName = linkStart.Parameter.ModelName;
showError = false;
te.UpdateStatus();
break;
}
}
}
if (showError) MessageBox.Show(MessageStrings.linkNoFreeInput, MessageStrings.linkError, MessageBoxButtons.OK, MessageBoxIcon.Information);
break;
}
MessageBox.Show(MessageStrings.linkErrorToData, MessageStrings.linkError, MessageBoxButtons.OK, MessageBoxIcon.Information);
break;
}
}
DeleteElement(_linkArrow.StopElement);
DeleteElement(_linkArrow);
_linkArrow = null;
IsInitialized = false;
Invalidate();
Application.DoEvents();
return;
}
//If we detect the user clicked on a element and didn't move the mouse we select that element and clear the others
if (_mouseMoved == false && _mouseDownOnElement)
{
if (ModifierKeys != Keys.Control)
{
ClearSelectedElements();
foreach (ModelElement me in _modelElements)
{
if (_modelElementsSelected.Contains(me))
continue;
if (me.PointInElement(virPt))
{
if (ModifierKeys == Keys.Control)
{
RemoveSelectedElement(me);
_mouseDownOnElement = false;
}
AddSelectedElement(me);
_mouseDownOnElement = false;
return;
}
}
}
}
//When the user lets go of the select box we find out which elements it selected
if (_selectBoxDraw && _mouseMoved)
{
ClearSelectedElements();
List<ModelElement> elementBox = new List<ModelElement>();
foreach (ModelElement me in _modelElements)
{
if (_modelElementsSelected.Contains(me))
continue;
if (me.ElementInRectangle(PixelRectToVirtualRect(_selectBox)))
{
elementBox.Add(me);
}
}
for (int i = elementBox.Count - 1; i >= 0; i--)
{
AddSelectedElement(elementBox[i]);
}
}
//After a mouse up we reset the mouse variables
_selectBoxDraw = false;
Invalidate(_selectBox);
_mouseDownOnElement = false;
_mouseMoved = false;
}
/// <summary>
/// When the users clicks the mouse this event fires
/// </summary>
/// <param name="e"></param>
protected override void OnMouseDown(MouseEventArgs e)
{
base.OnMouseDown(e);
_mouseDownOnElement = false;
_mouseMoved = false;
Point virPt = PixelToVirtual(e.Location);
_mouseOldPoint = MousePosition;
//Deals with left clicks when the model is in link mode
if (e.Button == MouseButtons.Left && _enableLinking)
{
//figure out if the user click on a element
foreach (ModelElement me in _modelElements)
{
if (me.PointInElement(virPt))
{
DataElement de = me as DataElement;
if (de != null)
{
BlankElement linkDestination = new BlankElement(_modelElements);
AddElement(linkDestination, virPt);
_linkArrow = AddArrow(de, linkDestination);
AddSelectedElement(linkDestination);
return;
}
}
}
_linkArrow = null;
return;
}
//Deals with left clicks when the model is not in link mode
if (e.Button == MouseButtons.Left)
{
//If the user left clicked on a selected element we do nothing
foreach (ModelElement me in _modelElementsSelected)
{
//Point pt = new Point(virPt.X - me.Location.X, virPt.Y - me.Location.Y);
if (me.PointInElement(virPt))
{
if (ModifierKeys == Keys.Control)
{
RemoveSelectedElement(me);
_mouseDownOnElement = false;
}
_mouseDownOnElement = true;
return;
}
}
//If the user left clicked on a unselected element we clear the selected list and highlight the new element
foreach (ModelElement me in _modelElements)
{
if (_modelElementsSelected.Contains(me))
continue;
// Point pt = new Point(virPt.X - me.Location.X, virPt.Y - me.Location.Y);
if (me.PointInElement(virPt))
{
if (ModifierKeys != Keys.Control)
{
ClearSelectedElements();
}
_mouseDownOnElement = true;
AddSelectedElement(me);
break;
}
}
//If the mouse is clicked on a white area we draw a box
if (_mouseDownOnElement == false)
{
ClearSelectedElements();
_selectBoxDraw = true;
_selectBoxPt = e.Location;
_selectBox = new Rectangle(virPt.X, virPt.Y, 0, 0);
}
}
}