debbie_82
Mar 12th, 2004, 12:54 AM
final class TraverseGrid{ private final static int UP = 1; private final static int DOWN = 2; private final static int LEFT = 3; private final static int RIGHT = 4; private static Vector getAllFocusableComponents(Container cycleRoot){ Vector components = new Vector(); int iCtr; for (iCtr = 0; iCtr < cycleRoot.getComponentCount(); iCtr++) { if ((cycleRoot.getComponent(iCtr).isFocusable()) == true){ components.addElement((Object)cycleRoot.getComponent(iCtr)); } } return components; } private static Component mapComponent(Vector components, Component origin, int position){ Component comp; Vector subset = new Vector(); Vector row = new Vector(); Point reference = origin.getLocation(); int minimum = origin.getLocation().y; Component temp; int iCtr; for (iCtr = 0; iCtr < components.size(); iCtr++ ) { temp = (Component)components.elementAt(iCtr); if ((position == UP && origin.getLocation().y > temp.getLocation().y) || (position == DOWN && origin.getLocation().y < temp.getLocation().y)) { if (minimum == origin.getLocation().y) minimum = temp.getLocation().y; else if ((position == UP && minimum < temp.getLocation().y)|| (position == DOWN && minimum > temp.getLocation().y)) minimum = temp.getLocation().y; subset.addElement(temp); } } comp = origin; for (iCtr = 0; iCtr < subset.size(); iCtr++) { temp = (Component)subset.elementAt(iCtr); comp = temp; if (temp.getLocation().y == minimum && temp.getLocation().x >= origin.getLocation().x) break; } return comp; } private static Component getComponent(Vector components, Component theComponent, int iDirection){ Component comp = theComponent; int iCtr; for (iCtr = 0; iCtr < components.size(); iCtr++) { if (theComponent.equals((Component)components.elementAt(iCtr)) == true){ if (iDirection == RIGHT) iCtr++; else iCtr--; break; } } if (iCtr > -1 && iCtr < components.size()) comp = (Component)components.elementAt(iCtr); return comp; } synchronized public static Component getAboveComponent(Container cycleRoot, Component origin){ Vector comp = getAllFocusableComponents(cycleRoot); return mapComponent(comp, origin, UP); } synchronized static Component getBelowComponent(Container cycleRoot, Component origin){ Vector comp = getAllFocusableComponents(cycleRoot); return mapComponent(comp, origin, DOWN); } synchronized static Component getNextComponent(Container container, Component origin){ return getComponent(getAllFocusableComponents(container), origin, LEFT); } synchronized static Component getPreviousComponent(Container container, Component origin){ return getComponent(getAllFocusableComponents(container), origin, RIGHT); } }