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#ifndef TOOLKIT_H      
#define TOOLKIT_H

#include "nsIToolkit.h"
#include "nsRepeater.h"

#include "nsCOMPtr.h"
#include "nsIEventQueueService.h"

/**
 * The toolkit abstraction is necessary because the message pump must
 * execute within the same thread that created the widget under Win32.
 * We don't care about that on Mac: we have only one thread for the UI
 * and maybe even for the whole application.
 * 
 * So on the Mac, the nsToolkit used to be a unique object, created once
 * at startup along with nsAppShell and passed to all the top-level
 * windows and it became a convenient place to throw in everything we
 * didn't know where else to put, like the PLEvent queue and
 * the handling of global pointers on some special widgets (focused
 * widget, widget hit, widget pointed).
 *
 * All this has changed: the application now usually creates one copy of
 * the nsToolkit per window and the special widgets had to be moved
 * to the nsMacEventHandler. Also, to avoid creating several repeaters,
 * the PLEvent queue has been moved to a global object of its own.
 *
 * If by any chance we support one day several threads for the UI
 * on the Mac, will have to create one instance of the PLEvent queue
 * per nsToolkit.
 */

struct PRThread;

class nsToolkit : public nsIToolkit
{

public:
  nsToolkit();
  virtual				~nsToolkit();
  
  NS_DECL_ISUPPORTS
    
  NS_IMETHOD  	Init(PRThread *aThread);
  
  // are there pending events on the toolkit's event queue?
  PRBool        ToolkitBusy();
  
public:

  // Appearance Mgr
  static bool 	HasAppearanceManager();
  
  // helpers to determine if the app is in the fg or bg
  static void AppInForeground ( ) ;
  static void AppInBackground ( ) ;
  static bool IsAppInForeground ( ) ;

protected:
  bool          mInited;
  static bool   sInForeground;
};


#endif  // TOOLKIT_H