EXPatchMasterExample.m

[NSWindow ex_patchInstanceSelector: @selector(sendEvent:) withReplacementBlock: ^(EXPatchIMP *patch) {
    return ^(NSEvent *event) {
        NSWindow *window = (__bridge NSWindow *) patch->self;
        if (window != self.window && [event type] == NSLeftMouseUp && [window isKeyWindow]) {
            /* The last view seen */
            static NSView *lastView = nil;
                            
            NSPoint point = [window.contentView convertPoint: [event locationInWindow] fromView: nil];
            NSView *hitView = [window.contentView hitTest: point];

            /* Only send a notification when the view changes */
            if (hitView != nil && hitView != lastView) {
                lastView = hitView;
                [[NSNotificationCenter defaultCenter] postNotificationName: EXViewAnalyzerTargetedViewNotification object: hitView];
            }
        }
        
        ((void (*)(id, SEL, NSEvent *))patch->origIMP)(event);
    };
}];