@interface AtkSampleOneDragSourceView<AtkDragSourceProtocol>

@end

@implementation AtkSampleOneDragSourceView

- (BOOL)shouldDragStart:(AtkDragAndDropManager *)manager
{
    return YES;
}

- (void)dragWillStart:(AtkDragAndDropManager *)manager
{
    // This is called before any call to AtkDropZoneProtocol shouldDragStart. 
    // It's a good place to setup data for that method to examine.
    manager.pasteboard.string = [NSString stringWithFormat:@"val-%ld", (long)self.tag];
}

@end

@interface AtkSampleOneDropZoneView<AtkDropZoneProtocol>

@end

@implementation AtkSampleOneDropZoneView

- (BOOL)shouldDragStart:(AtkDragAndDropManager *)manager
{
    // Yes, consider me for drags. Returning true here only
    // ensures that isInterested, dragStarted, and dragEnded will
    // be called. 
    return YES;
}

- (BOOL)isInterested:(AtkDragAndDropManager *)manager
{
    // If we return true here then dragEntered, dragExited, dragMoved and 
    // dragDropped can be called.
    // So, let's see if we are interested in what's on the pasteboard.
    // For the example this is if the pastbaord string matches
    // a string made up from the views tag property.

    BOOL ret = NO;
    UIPasteboard *pastebaord = manager.pasteboard;
    NSString *interestedInString = 
             [NSString stringWithFormat:@"val-%ld", (long)self.tag];
    if([interestedInString isEqualToString:pastebaord.string])
        ret = YES;

    return ret;
}

@end

@interface AtkSampleOneViewController : UIViewController<AtkDragAndDropManagerDelegate>

@property (nonatomic, retain) AtkDragAndDropManager *dragAndDropManager;

@end

@implementation AtkSampleOneViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        [self initialize];
    }
    return self;
}

- (void)initialize
{
    self.navigationItem.title = @"Sample One";
    //
    // By default the AtkDragAndDropManager uses the UIApplication key windows as 
    // the rootView and a UIPanGestureRecognizer. However, these are configurable.
    // Notice there is no need to register the drag sources or drop zones. The
    // AtkDragAndDropManager will by default traverse the view hierarch and find them. 
    // This behavior is also configurable through the AtkDragAndDropManager delegate.
    //
    self.dragAndDropManager = [[[AtkDragAndDropManager alloc] init] autorelease];
    // For the AtkDragAndDropManagerDelegate methods findDragSource: finrDropZones: and
    // isDropZoneActive:recognizer:, if we do not implement them here, the 
    // relevant methods in AtkDefaultDragAndDropManagerDelegate will be called.
    // This gives us our reasonable defaults even if we want to capture drag and drop
    // events here.
    self.dragAndDropManager.delegate = self;
}

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [self.dragAndDropManager start];
}

- (void)viewWillDisappear:(BOOL)animated
{
    [self.dragAndDropManager stop];
    [super viewWillDisappear:animated];
}

/**
 * Called when a drag is dropped onto a drop zone.
 */
- (void)dragDropped:(AtkDragAndDropManager *)manager
           dropZone:(id<AtkDropZoneProtocol>)dropZone 
              point:(CGPoint)point
{
   // The drag was dropped onto an interested AtkDropZoneProtocol. Do something with it.
}

@end