#include "xlinkobj.h"

 #include "branchobj.h"

 /////////////////////////////////////////////////////////////////

 // XLinkObj

 /////////////////////////////////////////////////////////////////

 int XLinkObj::arrowSize=10;						// make instances 

 XLinkObj::XLinkObj ():MapObj() 

 {

 	//	cout << "Const XLinkObj ()\n";

 	init();

 }

 XLinkObj::XLinkObj (QGraphicsScene* s):MapObj(s)

 {

 	//	cout << "Const XLinkObj (s)  called from MapCenterObj (s)\n";

 	init();

 }

 XLinkObj::~XLinkObj ()

 {

 //	cout << "Destr XLinkObj\n";

 	if (xLinkState!=undefinedXLink)

 		deactivate();

 	delete (line);

 	delete (poly);

 }

 void XLinkObj::init () 

 {

 	beginBranch=NULL;

 	endBranch=NULL;

 	visBranch=NULL;

 	xLinkState=undefinedXLink;

 	color=QColor (180,180,180);

 	width=1;

 	pen.setColor (color);

 	pen.setWidth (width);

 	pen.setCapStyle (  Qt::RoundCap );

 	line=scene->addLine(QLineF(1,1,1,1),pen);

     line->setZValue (Z_XLINK);

 	poly=scene->addPolygon(QPolygonF(),pen,color);

     poly->setZValue (Z_XLINK);

 	setVisibility (false);

 }

 void XLinkObj::copy (XLinkObj* other)

 {

 	// TODO copy not used yet

 	MapObj::copy (other);

 	setVisibility (other->visible);

 	beginBranch=other->beginBranch;

 	endBranch=other->endBranch;

 	width=other->width;

 }

 void XLinkObj::setBegin (BranchObj *bo)

 {

 	if (bo) 

 	{

 		xLinkState=initXLink;

 		beginBranch=bo;

 		beginPos=beginBranch->getChildPos();

 	}	

 }

 BranchObj* XLinkObj::getBegin ()

 {

 	return beginBranch;

 }

 void XLinkObj::setEnd (BranchObj *bo)

 {

 	if (bo) 

 	{

 		xLinkState=initXLink;

 		endBranch=bo;

 		endPos=endBranch->getChildPos();

 	}		

 }

 BranchObj* XLinkObj::getEnd()

 {

 	return endBranch;

 }

 void XLinkObj::setWidth (int w)

 {

 	width=w;

 	pen.setWidth (w);

 	setColor (color);

 }

 int XLinkObj::getWidth()

 {

 	return pen.width();

 }

 void XLinkObj::setColor(QColor c)

 {

 	color=c;

 	pen.setColor (c);

 	line->setPen (pen);

 	poly->setBrush( color );

 }

 QColor XLinkObj::getColor()

 {

 	return pen.color();

 }

 void XLinkObj::setEnd (QPointF p)

 {

 	endPos=p;

 }

 bool XLinkObj::activate ()

 {

 	if (beginBranch && endBranch)

 	{

 		if (beginBranch==endBranch) return false;

 		xLinkState=activeXLink;

 		beginBranch->addXLink (this);

 		endBranch->addXLink (this);

 		setVisibility ();

 		return true;

 	} else

 		return false;

 }

 void XLinkObj::deactivate ()

 {

 	if (beginBranch)

 		beginBranch->removeXLinkRef (this);

 	beginBranch=NULL;	

 	if (endBranch)

 		endBranch->removeXLinkRef (this);

 	endBranch=NULL;	

 	visBranch=NULL;

 	xLinkState=undefinedXLink;

 	line->hide();

 }

 bool XLinkObj::isUsed()

 {

 	if (beginBranch || endBranch || xLinkState!=undefinedXLink)

 		return true;

 	else

 		return false;

 }

 void XLinkObj::updateXLink()

 {

 	QPointF a,b;

 	QPolygonF pa;

 	if (visBranch)

 	{

 		// Only one of the linked branches is visible

 		a=b=visBranch->getChildPos();

 		if (visBranch->getOrientation()==LinkableMapObj::RightOfCenter)

 		{

 			b.setX (b.x()+25);

 			pa.clear();

 			pa<< QPointF(b.x(),b.y())<<

 				QPointF(b.x()-arrowSize,b.y()-arrowSize)<<

 				QPointF(b.x()-arrowSize,b.y()+arrowSize);

 			poly->setPolygon(pa);

 		} else

 		{

 			b.setX (b.x()-25);

 			pa.clear();

 			pa<< QPointF(b.x(),b.y())<<

 				QPointF(b.x()+arrowSize,b.y()-arrowSize)<<

 				QPointF(b.x()+arrowSize,b.y()+arrowSize);

 			poly->setPolygon (pa);

 		}	

 	} else

 	{

 		// Both linked branches are visible

 		if (beginBranch)

 			// If a link is just drawn in the editor,

 			// we have already a beginBranch

 			a=beginBranch->getChildPos();

 		else

 			// This shouldn't be reached normally...

 			a=beginPos;

 		if (xLinkState==activeXLink && endBranch)

 			b=endBranch->getChildPos();

 		else

 			b=endPos;

 	}

 	if (line->line().p1()==a && line->line().p2()==b && !visBranch)

 	{

 		// update is called from both branches, so only

 		// update if something has changed

 		return;

 	}	

 	else

 	{

 		beginPos=a;

 		endPos=b;

 		line->setPen (pen);

 		line->setLine(a.x(), a.y(), b.x(), b.y());

 	}

 }

 BranchObj* XLinkObj::otherBranch(BranchObj* thisBranch)

 {

 	if (!beginBranch && !endBranch)

 		return NULL;

 	if (thisBranch==beginBranch)

 		return endBranch;

 	else	

 		return beginBranch;

 }

 void XLinkObj::positionBBox()

 {

 }

 void XLinkObj::calcBBoxSize()

 {

 }

 void XLinkObj::setVisibility (bool b)

 {

 	MapObj::setVisibility (b);

 	if (b)

 	{

 		line->show();

 		if (visBranch) 

 			poly->show();

 		else	

 			poly->hide();

 	}	

 	else

 	{

 		line->hide();

 		poly->hide();

 	}	

 }

 void XLinkObj::setVisibility ()

 {

 	if (beginBranch && endBranch)

 	{

 		if(beginBranch->isVisibleObj() && endBranch->isVisibleObj())

 		{	// Both ends are visible

 			visBranch=NULL;

 			setVisibility (true);

 		} else

 		{

 			if(!beginBranch->isVisibleObj() && !endBranch->isVisibleObj())

 			{	//None of the ends is visible

 				visBranch=NULL;

 				setVisibility (false);

 			} else

 			{	// Just one end is visible, draw a symbol that shows

 				// that there is a link to a scrolled branch

 				if (beginBranch->isVisibleObj())

 					visBranch=beginBranch;

 				else

 					visBranch=endBranch;

 				setVisibility (true);

 			}

 		}

 	}

 }

 QString XLinkObj::saveToDir ()

 {

 	QString s="";

 	if (beginBranch && endBranch &&xLinkState==activeXLink)

 	{

 		if (beginBranch==endBranch && xLinkState)

 			s="";

 		else

 		{

 			QString colAttr=attribut ("color",color.name());

 			QString widAttr=attribut ("width",QString().setNum(width,10));

 			QString begSelAttr=attribut ("beginID",beginBranch->getSelectString());

 			QString endSelAttr=attribut ("endID",  endBranch->getSelectString());

 			s=beginElement ("xlink", colAttr +widAttr +begSelAttr +endSelAttr);

 			s+=endElement ("xlink");

 		}

 	}

 	return s;

 }