//
//  NSCImageView.m
//  DragAndDrop
//
//  Created by Vladimir Boychentsov on 2/26/10.
//  Copyright 2010 www.injoit.com. All rights reserved.
//

#import "NSCImageView.h"


@implementation NSCImageView

- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender
{
    if ((NSDragOperationGeneric & [sender draggingSourceOperationMask]) 
		== NSDragOperationGeneric)
    {
        //this means that the sender is offering the type of operation we want
        //return that we want the NSDragOperationGeneric operation that they 
		//are offering
        return NSDragOperationGeneric;
    }
    else
    {
        //since they aren't offering the type of operation we want, we have 
		//to tell them we aren't interested
        return NSDragOperationNone;
    }
}



- (void)draggingExited:(id <NSDraggingInfo>)sender
{
    //we aren't particularily interested in this so we will do nothing
    //this is one of the methods that we do not have to implement
	//NSLog(@"%@", sender);
}


- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
{
	NSPasteboard *pboard = [sender draggingPasteboard];
	
    if ( [[pboard types] containsObject:NSFilenamesPboardType] ) {
		//  NSArray *files = [pboard propertyListForType:NSFilenamesPboardType];
        //NSLog(@"%@", files);
        // Perform operation using the list of files
    }
	
	
    NSPasteboard *paste = [sender draggingPasteboard];
	
	//gets the dragging-specific pasteboard from the sender
    NSArray *types = [NSArray arrayWithObjects:NSTIFFPboardType, 
					  NSFilenamesPboardType, nil];
	//a list of types that we can accept
    NSString *desiredType = [paste availableTypeFromArray:types];
    NSData *carriedData = [paste dataForType:desiredType];
	
    if (nil == carriedData)
    {
        //the operation failed for some reason
        NSRunAlertPanel(@"Paste Error", @"Sorry, but the past operation failed", 
						nil, nil, nil);
        return NO;
    }
    else
    {
        //the pasteboard was able to give us some meaningful data
        if ([desiredType isEqualToString:NSTIFFPboardType])
        {
            //we have TIFF bitmap data in the NSData object
			NSImage *newImage = [[NSImage alloc] initWithData:carriedData];
			[self setImage:newImage];
			[newImage release];    
			//we are no longer interested in this so we need to release it
        }
        else if ([desiredType isEqualToString:NSFilenamesPboardType])
        {
            //we have a list of file names in an NSData object
            NSArray *fileArray = 
			[paste propertyListForType:@"NSFilenamesPboardType"];
			//be caseful since this method returns id.  
			//We just happen to know that it will be an array.
            NSString *path = [fileArray objectAtIndex:0];
			//assume that we can ignore all but the first path in the list
            NSImage *newImage = [[NSImage alloc] initWithContentsOfFile:path];
			
            if (nil == newImage)
            {
                //we failed for some reason
                NSRunAlertPanel(@"File Reading Error", 
								[NSString stringWithFormat:
								 @"Sorry, but I failed to open the file at \"%@\"",
								 path], nil, nil, nil);
                return NO;
            }
            else
            {
                //newImage is now a new valid image
				[self setImage:newImage];
            }
            [newImage release];
        }
        else
        {
            //this can't happen
            NSAssert(NO, @"This can't happen");
            return NO;
        }
    }
    [self setNeedsDisplay:YES];    //redraw us with the new image
    return YES;
}



@end