/*

     File: DragMatrix.m 

 Abstract: This is a basic NSMatrix subclass that accepts image files dragged into it. 

  Version: 1.1 

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 */

#import "DragMatrix.h"

#import "TransparentButtonCell.h"

@implementation DragMatrix

- (BOOL)prepareForDragOperation:(id <NSDraggingInfo>)sender

{

    //check to see if we can accept the data

    return [NSImage canInitWithPasteboard: [sender draggingPasteboard]];

}

- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender

{

    NSInteger row, column;

    NSImage *image;

        // we convert the point to our own coordinates

    NSPoint location=[self convertPoint:[sender draggingLocation] fromView:nil];

        // check if we can init an NSImage with the dropped content

    if([NSImage canInitWithPasteboard: [sender draggingPasteboard]]) {

            // init with the dropped content

        image = [[[NSImage alloc] initWithPasteboard: [sender draggingPasteboard]] autorelease];

            // we get which row/column the drop point corresponds to

        if ( [self getRow:&row column:&column forPoint:location] ) {

            TransparentButtonCell *cell = [self cellAtRow:row column:column];

            [cell setImagePosition:NSImageOverlaps];

            // If the image is bigger than the cell, resize it to fit

            if ( [image size].width > [self cellSize].width || [image size].height > [self cellSize].height )

            {

                [image setScalesWhenResized:YES];

                [image setSize:NSMakeSize([self cellSize].width, [self cellSize].height)];

            }

            [cell setImage:image];

            return YES;

        } else

            return NO;

    } else

        return NO;

}

- (void)awakeFromNib

{

    [self registerForDraggedTypes:[NSArray arrayWithObjects:NSFilenamesPboardType,nil]];

}

- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender

{

        // This will cause the + sign to appear next to the cursor when hovering over the view.

    return NSDragOperationCopy;

}

@end