public void installEventHandlersForCanvas() {
installUserInputHandlers();
final OverviewCanvas overview = diagramPane.getOverview();
canvas.addHandler(diagramPane.getOverview(), ViewChangeEvent.TYPE);
// highlight linked objects
SelectionEventHandler selectionHandler =
new SelectionEventHandler() {
@Override
public void onSelectionChanged(SelectionEvent e) {
hiliteAndCentreObjects(e);
overview.setSelectedObjects(e.getSelectedObjects());
overview.update();
}
};
diagramPane.addSelectionEventHandler(selectionHandler);
}
public void installOverviewEventHandler() {
final OverviewCanvas overview = diagramPane.getOverview();
// To catch overview dragging
ViewChangeEventHandler overviewEventHandler =
new ViewChangeEventHandler() {
@Override
public void onViewChange(ViewChangeEvent event) {
double dx = event.getTranslationEvent().getTranslateX();
double dy = event.getTranslationEvent().getTranslateY();
double scale = event.getZoomEvent().getScale();
double canvasScale = canvas.getScale();
// System.out.println("responding to overview click");
diagramPane.translate(-dx / scale * canvasScale, -dy / scale * canvasScale);
diagramPane.update();
overview.setIsFromOverview(false); // Overview Canvas can now respond to ViewChangeEvent
// now that it's own event firing has finished
}
};
overview.addHandler(overviewEventHandler, ViewChangeEvent.TYPE);
}
