test.m

- (void) selectView:(id)dummy
{ 
  NSEvent  *event;
  id        view;
  NSCursor *cursor = [NSCursor crosshairCursor];  
  NSDate   *distantFuture = [NSDate distantFuture];
  
  NSRect infoRect = NSMakeRect(0, 0, 290, 100);
  NSTextView *infoView = [[[NSTextView alloc] initWithFrame:NSZeroRect] autorelease];
  [infoView setEditable:NO];
  [infoView setSelectable:NO];
  [infoView setDrawsBackground:NO];
  [infoView setTextColor:[NSColor whiteColor]];
  [infoView setFont:[NSFont controlContentFontOfSize:10]];
  [infoView setTextContainerInset:NSMakeSize(4, 4)];
  //[infoView setAutoresizingMask:NSViewHeightSizable|NSViewMinYMargin];
  [infoView setVerticallyResizable:NO];
  
  NSMutableParagraphStyle *paragraphStyle = [[[NSParagraphStyle defaultParagraphStyle] mutableCopy] autorelease];
  [paragraphStyle setLineBreakMode:NSLineBreakByTruncatingTail];
  [infoView setDefaultParagraphStyle:paragraphStyle];
          
  NSPanel *infoWindow = [[[NSPanel alloc] initWithContentRect:infoRect styleMask:NSHUDWindowMask /*| NSTitledWindowMask*/ | NSUtilityWindowMask backing:NSBackingStoreBuffered defer:NO] autorelease];  
  [infoWindow setLevel:NSFloatingWindowLevel];
  [infoWindow setContentView:infoView];
  
 // NSWindow *focusWindow = [[[NSWindow alloc] initWithContentRect:NSZeroRect styleMask:NSBorderlessWindowMask backing:NSBackingStoreBuffered defer:NO] autorelease];
  
  NSWindow *focusWindow = [[NSWindow alloc] initWithContentRect:NSZeroRect styleMask:NSBorderlessWindowMask backing:NSBackingStoreBuffered defer:NO] ;

  [focusWindow setBackgroundColor:[NSColor selectedTextBackgroundColor]];
  [focusWindow setAlphaValue:0.7];
  [focusWindow setIgnoresMouseEvents:YES];

  [cursor push];
  
  selectedView = nil;
  
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(menuWillSendAction:) name:NSMenuWillSendActionNotification object:nil];
  
  do
  { 
    [cursor push]; 
    event = [NSApp nextEventMatchingMask:~0 untilDate:distantFuture inMode:NSEventTrackingRunLoopMode dequeue:YES];
    [cursor pop];
    if ([event type] == NSMouseMoved)
    {      
      NSInteger  windowCount; 
      NSInteger *windows;
      
      view = nil;
      
      NSCountWindows(&windowCount);
      windows = malloc(windowCount*sizeof(NSInteger));
      NSWindowList(windowCount, windows);
      
      for (unsigned i = 0; i < windowCount; i++)
      {
        NSWindow *window = [NSApp windowWithWindowNumber:windows[i]];
        if (window && window != focusWindow && window != infoWindow) 
        {
          view = [[[window contentView] superview] hitTest:[window convertScreenToBase:[NSEvent mouseLocation]]];
          if (view) break;
        }
      }
      
      free(windows);
      
      if (view) 
      {
        NSRect rectInWindowCoordinates = [view convertRect:[view visibleRect] toView:nil];;
        NSRect rectInScreenCoordinates;
        NSSize size = NSMakeSize(220,21);
        rectInScreenCoordinates.size = rectInWindowCoordinates.size;
        rectInScreenCoordinates.origin = [[view window] convertBaseToScreen:rectInWindowCoordinates.origin];       
        
        if ([focusWindow parentWindow] != [view window])
        {
          [[focusWindow parentWindow] removeChildWindow:focusWindow];
          [[view window] addChildWindow:focusWindow ordered:NSWindowAbove];
        }
        [focusWindow setFrame:rectInScreenCoordinates display:YES];
        
        /* NSMutableString *infoString = [NSMutableString string];
        
        [infoString appendFormat:@"Bounds:\t%@\n", printString([NSValue valueWithRect:[view bounds]])];
        [infoString appendFormat:@"Frame:\t%@\n", printString([NSValue valueWithRect:[view frame]])];
        [infoString appendFormat:@"Superview:\t%@\n", [[view superview] class]];
        [infoString appendString:@"Subviews:\n"];
        for (NSView *subview in [view subviews]) [infoString appendFormat:@"\t\t%@\n", [subview class]];
        
        [infoView setString:infoString];
        
        size = [[infoView textStorage] size];
        size.width  += 15;
        size.height += 10;
        */
         
        NSPoint origin = NSMakePoint([NSEvent mouseLocation].x+12, [NSEvent mouseLocation].y-size.height-9);
        [infoWindow setFrame:NSMakeRect(origin.x, origin.y, size.width, size.height) display:YES animate:NO];
        //[infoWindow setTitle:[NSString stringWithFormat:@"%@: %p", [view class], view]];
        [infoView setString:[NSString stringWithFormat:@"%@: %p", [view class], view]];
        
        [infoWindow orderFront:nil];
      }
      else
      {
        [[focusWindow parentWindow] removeChildWindow:focusWindow];
        [focusWindow orderOut:nil];
        [infoWindow orderOut:nil];
        //[self browseNothing];
      }
    }  

  }
  while ( [event type] != NSLeftMouseDown && selectedView == nil && !([event type] == NSKeyDown && [[event characters] characterAtIndex:0] == ESCAPE) );
   
  [[NSNotificationCenter defaultCenter] removeObserver:self name:NSMenuWillSendActionNotification object:nil];
  [cursor pop];
  [[focusWindow parentWindow] removeChildWindow:focusWindow];
  [focusWindow close];
  [infoWindow close];
  
  if ( !([event type] == NSKeyDown && [[event characters] characterAtIndex:0] == ESCAPE) )
  {
    if (selectedView == nil)
      view = [[[[event window] contentView] superview] hitTest:[event locationInWindow]];
    else
      view = selectedView;
    
    [self setRootObject:view];
    [selectedView release];
    [[self window] performSelector:@selector(makeKeyAndOrderFront:) withObject:nil afterDelay:0];
    [NSApp activateIgnoringOtherApps:YES];    
  }
}