/*
* @(#)PertDependency.java 5.1
*
*/
package CH.ifa.draw.samples.pert;
import java.awt.Color;
import java.util.Vector;
import CH.ifa.draw.figures.ArrowTip;
import CH.ifa.draw.figures.LineConnection;
import CH.ifa.draw.figures.PolyLineFigure;
import CH.ifa.draw.framework.Figure;
import CH.ifa.draw.framework.Handle;
import CH.ifa.draw.standard.NullHandle;
public class PertDependency extends LineConnection {
/*
* Serialization support.
*/
private static final long serialVersionUID = -7959500008698525009L;
private int pertDependencySerializedDataVersion = 1;
public PertDependency() {
setEndDecoration(new ArrowTip());
setStartDecoration(null);
}
public void handleConnect(Figure start, Figure end) {
PertFigure source = (PertFigure)start;
PertFigure target = (PertFigure)end;
if (source.hasCycle(target)) {
setAttribute("FrameColor", Color.red);
} else {
target.addPreTask(source);
source.addPostTask(target);
source.notifyPostTasks();
}
}
public void handleDisconnect(Figure start, Figure end) {
PertFigure source = (PertFigure)start;
PertFigure target = (PertFigure)end;
if (target != null) {
target.removePreTask(source);
target.updateDurations();
}
if (source != null)
source.removePostTask(target);
}
public boolean canConnect(Figure start, Figure end) {
return (start instanceof PertFigure && end instanceof PertFigure);
}
public Vector<Handle> handles() {
Vector handles = super.handles();
// don't allow to reconnect the starting figure
handles.setElementAt(
new NullHandle(this, PolyLineFigure.locator(0)), 0);
return handles;
}
}