/*

    File:  TrackTable.m

    Contains:  NSTableView subclass to handle drag and drop operations

    Copyright:  (c) Copyright 2005 Apple Computer, Inc. All rights reserved.

    Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Computer, Inc.

    ("Apple") in consideration of your agreement to the following terms, and your

    use, installation, modification or redistribution of this Apple software

    constitutes acceptance of these terms.  If you do not agree with these terms,

    please do not use, install, modify or redistribute this Apple software.

    In consideration of your agreement to abide by the following terms, and subject

    to these terms, Apple grants you a personal, non-exclusive license, under Apple's

    copyrights in this original Apple software (the "Apple Software"), to use,

    reproduce, modify and redistribute the Apple Software, with or without

    modifications, in source and/or binary forms; provided that if you redistribute

    the Apple Software in its entirety and without modifications, you must retain

    this notice and the following text and disclaimers in all such redistributions of

    the Apple Software.  Neither the name, trademarks, service marks or logos of

    Apple Computer, Inc. may be used to endorse or promote products derived from the

    Apple Software without specific prior written permission from Apple.  Except as

    expressly stated in this notice, no other rights or licenses, express or implied,

    are granted by Apple herein, including but not limited to any patent rights that

    may be infringed by your derivative works or by other works in which the Apple

    Software may be incorporated.

    The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

    WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

    WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION ALONE OR IN

    COMBINATION WITH YOUR PRODUCTS.

    IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE

    GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

    ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION AND/OR DISTRIBUTION

    OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER UNDER THEORY OF CONTRACT, TORT

    (INCLUDING NEGLIGENCE), STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN

    ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    Change History (most recent first):

            1.0 (July 5th, 2005)

*/

#import "TrackTable.h"

const float DragImageAlpha = 0.55f;

@implementation TrackTable

// -------------------------------------------------------------------------------

//  respondsToSelector

// -------------------------------------------------------------------------------

//  NSObject - overridden to print out who's asking us for methods.  Sometimes

//  this is useful when adding new code.

//

#if 0

- (BOOL)respondsToSelector:(SEL)selector

{

    NSLog(@"TrackTable rts: %@", NSStringFromSelector(selector));

    return [super respondsToSelector:selector];

}

#endif

// ----------------------------------------------------------------------

//  dragImageForRows:event:dragImageOffset:

// ----------------------------------------------------------------------

//  Overridden because we want to add an iTunes-esque background on dragged

//  items to provide more visual weight.

//

- (NSImage *)dragImageForRows:(NSArray *)rows event:(NSEvent *)event dragImageOffset:(NSPoint*)offset

{

    // Get our superclass's image -- it's a good starting point.

    NSImage *superImage = [super dragImageForRows:rows event:event dragImageOffset:offset];

    NSSize  superImageSize = [superImage size];

    // Allocate an image which is just a bit larger.

    NSRect  imageRect;

    imageRect.origin.x = 0.0f;

    imageRect.origin.y = 0.0f;

    imageRect.size.width = superImageSize.width + 3.0f;

    imageRect.size.height = superImageSize.height + 2.0f;

    NSImage *newImage = [[[NSImage alloc] initWithSize:imageRect.size] autorelease];

    [newImage lockFocus];

    // Create a transparent row-sized fill.

    [[[NSColor whiteColor] colorWithAlphaComponent:DragImageAlpha] set];

    NSRectFill(imageRect);

    // Frame it with transparent black.

    [[NSColor blackColor] set];

    NSFrameRectWithWidthUsingOperation(imageRect,1.0f,NSCompositeDestinationOver);

    // Draw our superclass's image underneath the fill.

    [superImage compositeToPoint:NSMakePoint(1.0f, 1.0f) operation:NSCompositeDestinationOver];

    // End drawing

    [newImage unlockFocus];

    return newImage;

}

// ----------------------------------------------------------------------

//  draggingSourceOperationMaskForLocal:

// ----------------------------------------------------------------------

//  Indicates the type of drag operations we support.

//

- (NSDragOperation)draggingSourceOperationMaskForLocal:(BOOL)isLocal

{

    if (isLocal)

    {

        // We allow local dragging, which can be either a move or a copy.

        return (NSDragOperationMove | NSDragOperationCopy);

    }

    else

    {

        // No dragging outside of the table for now.

        return NSDragOperationNone;

    }

}

// ----------------------------------------------------------------------

//  keyDown:

// ----------------------------------------------------------------------

//  Overridden to map the delete key to the "Delete" menu item.

//

- (void)keyDown:(NSEvent *)theEvent

{

    NSString    *characters = [theEvent charactersIgnoringModifiers];

    BOOL        handled = NO;

    if ([characters length] == 1)

    {

        unichar c = [characters characterAtIndex:0];

        if (c == NSDeleteFunctionKey || c == 0x7F)

        {

            handled = YES;

            [[self delegate] delete:self];

        }

    }

    if (!handled)

        [super performKeyEquivalent:theEvent];

}

@end