NSDropContainer

NSDropContainer.h

//
//  NSDropContainer.h


#import <Cocoa/Cocoa.h>

@protocol NSDropContainerDelegate;

@interface NSDropContainer : NSBox {
    id<NSDropContainerDelegate> _delegate;
    NSString                    * _filePath;
    NSSet                    * _legalExtensionss;
    NSImageView              * _imageView;
@private
    
}
@property (nonatomic,retain) NSImageView                       * imageView;
@property (nonatomic,retain) NSSet *                           legalExtensions;
@property (nonatomic,retain) NSString                           * filePath;
@property (nonatomic,assign) IBOutlet id<NSDropContainerDelegate> delegate;


@end


@protocol NSDropContainerDelegate <NSObject>
@required
- (void)containerCaptureFilePath:(NSString*)filePath dropContainer:(NSDropContainer*)dropContainer;

@end

NSDropContainer.m

//
//  NSDropContainer.m


#import "NSDropContainer.h"


@implementation NSDropContainer
@synthesize delegate            = _delegate;
@synthesize filePath            = _filePath;
@synthesize legalExtensions     = _legalExtensions;
@synthesize imageView           = _imageView;
- (id)initWithFrame:(NSRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code here.
    }
    
    return self;
}

- (void)dealloc
{
    self.legalExtensions = nil;
    self.delegate = nil;
    self.filePath = nil;
    [super dealloc];
}
/*
- (void)drawRect:(NSRect)dirtyRect
{
  // Drawing code here.
}
 */



- (void)viewWillMoveToSuperview:(NSView *)newSuperview{
    [self registerForDraggedTypes:[NSArray arrayWithObjects:NSFilenamesPboardType, nil]];
}

- (BOOL)isPathLegal:(NSString *)filePath{
    if (_legalExtensionss) {
        NSString *fileName = [filePath pathExtension];
//        return [[fileName lowercaseString] isEqualToString:_legalExtension];
        if ([_legalExtensionss containsObject:[fileName lowercaseString]]) {
            return YES;
        }

    }else{
        return YES;
    }
    return NO;
}

- (void)handelTheFiles:(NSArray*)array{
    if (array && [array count] >0) {
        for (NSString * filePath in array) {
            if ([self isPathLegal:filePath]) {
                
                self.filePath = filePath;

                [self.delegate containerCaptureFilePath:filePath
                                          dropContainer:self];
                return;
            }
        }
    }
}

#pragma mark - Dragging Method

- (BOOL)performDragOperation:(id<NSDraggingInfo>)sender{
    NSPasteboard *pasteboard = [sender draggingPasteboard];
    if ( [[pasteboard types] containsObject:NSFilenamesPboardType] ) {
        NSArray *files = [pasteboard propertyListForType:NSFilenamesPboardType];
        [self handelTheFiles:files];
        // Perform operation using the list of files
    }
    return YES;
}


- (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)sender{
    NSPasteboard *pboard;
    NSDragOperation sourceDragMask;
    sourceDragMask = [sender draggingSourceOperationMask];
    pboard = [sender draggingPasteboard];
    if ( [[pboard types] containsObject:NSFilenamesPboardType] ) {
        if (sourceDragMask & NSDragOperationGeneric) {
            return NSDragOperationGeneric;
        }
    }
    return NSDragOperationNone;
    
}




@end