/**
* Checks if a tool tip is required for the given position.
* NOTE: We currently return a tool tip for edges only
* @param ptPos The position to query
* @param rc Holds the tip's rectangle, upon return
* @return The tip's text, or QString::null if no tip is required
*/
QString GraphWidget::getTip(const QPoint& ptPos, QRect& rc)
{
QPoint ptRealPos, ptTopLeft, ptBottomRight;
QCanvasItemList il;
QCanvasItemList::Iterator itr;
GraphEdge* pEdge;
QString sText, sFile, sLine;
ptRealPos = viewportToContents(ptPos);
ptRealPos /= m_dZoom;
pEdge = NULL;
// Check if there is an edge at this position
il = canvas()->collisions(ptRealPos);
for (itr = il.begin(); itr != il.end(); ++itr) {
pEdge = dynamic_cast<GraphEdge*>(*itr);
if (pEdge != NULL)
break;
}
// No tip if no edge was found
if (pEdge == NULL)
return QString::null;
// Set the rectangle for the tip (the tip is closed when the mouse leaves
// this area)
rc = pEdge->tipRect();
ptTopLeft = rc.topLeft();
ptBottomRight = rc.bottomRight();
ptTopLeft *= m_dZoom;
ptBottomRight *= m_dZoom;
ptTopLeft = contentsToViewport(ptTopLeft);
ptBottomRight = contentsToViewport(ptBottomRight);
rc = QRect(ptTopLeft, ptBottomRight);
// Create a tip for this edge
return pEdge->getTip();
}
