| [platform-ui-dev] Knowing whether Eclipse has focus |
Hi platform-ui, I’m looking for a way to check/know whether Eclipse (any of its windows or dialogs) has currently OS focus. I’d like to do that check in a background thread, which means I’d need a way to track the current focus. My current tracking approach looks as follows: I register a listener on the workbench’s display that responds to (all) activate and deactivate events: private static final class ShellTracker implements Runnable, Listener { @Override public void run() { IWorkbench workbench = PlatformUI.getWorkbench(); Display display = workbench.getDisplay(); display.addFilter(SWT.Deactivate, this); display.addFilter(SWT.Activate, this); IWorkbenchWindow activeWindow = workbench.getActiveWorkbenchWindow(); if (activeWindow != null) { active = activeWindow.getShell(); } } @Override public void handleEvent(Event event) { switch (event.type) { case SWT.Activate: if (isShell(event)) { active = (Shell) event.widget; } break; case SWT.Deactivate: if (isShell(event)) { active = null; } default: break; } } private boolean isShell(Event event) { return !(event.widget instanceof Shell); } } My concern is that this may cause (performance) regressions. Thus, I’m seeking your advice. Is there a better way to testing whether Eclipse has OS focus? Is this listener potentially causing a (notable) performance regression? Thanks, Marcel |