private Vertex findSingleVertex() {
Vertex vertex = selection.getAnyVertex();
// if there is no selection we select an existing vertex
if (vertex == null) {
vertex = (Vertex) graph.getVertices().next();
}
return vertex;
}
/** A menu popup trigger has been detected. Handle it. */
public void handlePopupTrigger(MouseEvent evt) {
int clickX = evt.getX();
int clickY = evt.getY();
SelectableGraphElement clickedElement = graph.findGraphElement(clickX, clickY);
if (clickedElement != null) {
selection.selectOnly(clickedElement);
postMenu(clickedElement, clickX, clickY);
} else {
postMenu(clickX, clickY);
}
}
/** A mouse-pressed event. Analyse what we should do with it. */
public void mousePressed(MouseEvent evt) {
graphEditor.requestFocus();
int clickX = evt.getX();
int clickY = evt.getY();
SelectableGraphElement clickedElement = graph.findGraphElement(clickX, clickY);
notifyPackage(clickedElement);
if (clickedElement == null) { // nothing hit
if (!isMultiselectionKeyDown(evt)) {
selection.clear();
}
if (isButtonOne(evt)) marquee.start(clickX, clickY);
} else if (isButtonOne(evt)) { // clicked on something
if (isMultiselectionKeyDown(evt)) {
// a class was clicked, while multiselectionKey was down.
if (clickedElement.isSelected()) {
selection.remove(clickedElement);
} else {
selection.add(clickedElement);
}
} else {
// a class was clicked without multiselection
if (!clickedElement.isSelected()) {
selection.selectOnly(clickedElement);
}
}
if (isDrawingDependency()) {
if (clickedElement instanceof Target)
rubberBand = new RubberBand(clickX, clickY, clickX, clickY);
} else {
dragStartX = clickX;
dragStartY = clickY;
if (clickedElement.isHandle(clickX, clickY)) {
resizing = true;
} else {
moving = true;
}
}
}
}
/** The mouse was released. */
public void mouseReleased(MouseEvent evt) {
if (isDrawingDependency()) {
SelectableGraphElement selectedElement = graph.findGraphElement(evt.getX(), evt.getY());
notifyPackage(selectedElement);
graphEditor.repaint();
}
rubberBand = null;
SelectionSet newSelection = marquee.stop(); // may or may not have had a marquee...
if (newSelection != null) {
selection.addAll(newSelection);
graphEditor.repaint();
}
if (moving || resizing) {
endMove();
graphEditor.revalidate();
graphEditor.repaint();
}
}
/** Select all graph vertices. */
private void selectAll() {
for (Iterator<? extends Vertex> i = graph.getVertices(); i.hasNext(); ) {
selection.add(i.next());
}
}