public Point getViewportOrigin() {
Point result = new Point(0, 0);
Viewport viewport = getViewPort();
if (viewport != null) {
result = new Point(viewport.getClientArea().getLocation());
}
return result;
}
// We override reveal to show the Handles of the selected EditPart when
// scrolling
public void reveal(EditPart part) {
// In some case, the editor control is not created, but get the sync selection event.
// Fix this problem temporary.
if (getFigureCanvas() == null || getFigureCanvas().isDisposed()) {
return;
}
Viewport port = getFigureCanvas().getViewport();
IFigure target = ((GraphicalEditPart) part).getFigure();
Rectangle exposeRegion = target.getBounds().getCopy();
// Get the primary editpolicy
EditPolicy policy = part.getEditPolicy(EditPolicy.PRIMARY_DRAG_ROLE);
// If the policy let us access the handles, proceed, otherwise
// default to original behaviour
if (!(policy instanceof ISelectionHandlesEditPolicy)) {
super.reveal(part);
return;
}
// First translate exposeRegion to the root level
target = target.getParent();
while (target != null && target != port) {
target.translateToParent(exposeRegion);
target = target.getParent();
}
// Merge selection handles if any to the exposeRegion
List handles = ((ISelectionHandlesEditPolicy) policy).getHandles();
for (Iterator iter = handles.iterator(); iter.hasNext(); ) {
AbstractHandle handle = (AbstractHandle) iter.next();
Locator locator = handle.getLocator();
locator.relocate(handle);
exposeRegion.union(handle.getBounds().getCopy());
}
exposeRegion.getExpanded(5, 5);
Dimension viewportSize = port.getClientArea().getSize();
Point topLeft = exposeRegion.getTopLeft();
Point bottomRight = exposeRegion.getBottomRight().translate(viewportSize.getNegated());
Point finalLocation = new Point();
if (viewportSize.width < exposeRegion.width)
finalLocation.x = Math.min(bottomRight.x, Math.max(topLeft.x, port.getViewLocation().x));
else finalLocation.x = Math.min(topLeft.x, Math.max(bottomRight.x, port.getViewLocation().x));
if (viewportSize.height < exposeRegion.height)
finalLocation.y = Math.min(bottomRight.y, Math.max(topLeft.y, port.getViewLocation().y));
else finalLocation.y = Math.min(topLeft.y, Math.max(bottomRight.y, port.getViewLocation().y));
getFigureCanvas().scrollSmoothTo(finalLocation.x, finalLocation.y);
}