text: //
  //  PTCoordinatingController.h
  //
  
  #import <Foundation/Foundation.h>
  #import "PTExampleCanvasViewController.h"
  #import "PTPaletteViewController.h"
  #import "PTThumbnailViewController.h"
  
  typedef NS_ENUM(unsigned int, ButtonTag) {
    kButtonTagDone,
    kButtonTagOpenPaletteView,
    kButtonTagOpenThumbnailView
  };
  
  @interface PTCoordinatingController : NSObject
  
  @property (nonatomic, readonly) UIViewController *activeViewController;
  @property (nonatomic, readonly) PTExampleCanvasViewController *canvasViewController;
  
  + (PTCoordinatingController *) sharedInstance;
  
  - (IBAction) requestViewChangeByObject:(id)object;
  
  @end
  