/*

 MyController.m

 MP3 Player

 Author: MCF

 Description: This file contains the implementation for MyController, the object that is the data source for the table, managing the array of MP3 paths and handling drag-and-drop of MP3s into MP3 Player.

 Copyright (c) 2001-2002, Apple Computer, Inc., all rights reserved.

 */

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#import "MyController.h"

@implementation MyController

// Runs when we unpack from the nib

-(void)awakeFromNib

{

    // The "songs" array holds paths to MP3s in the table

    songs=[[NSMutableArray alloc] init];

    // When we double-click a row in the table, we want it to call our own routine

    // (implemented in our custom table class) to play the song.

    // Incidentally, we also have a "Play" button in the nib wired up to -playSong:

    [songTable setDoubleAction:@selector(playSong:)];

    // We tell the table that we'll be dragging in filenames

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

    // When we quit the app, we want the song to stop playing, so we register to have stopPlaying:

    // be called when the proper notification comes in

    [[NSNotificationCenter defaultCenter] addObserver: songTable selector: @selector(stopPlaying:) name: NSApplicationWillTerminateNotification object:NSApp];

}

// Mandatory tableview data source method

- (int)numberOfRowsInTableView:(NSTableView *)tableView

{

    return [songs count];

}

// Mandatory tableview data source method

- (id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(int)row

{

    // We only have one column, so the row is all we care about

    return [songs objectAtIndex:row];

}

// Since the songs array is stored in this object, we need an accessor method to give us the particular

// song path for a given selected row in the table.  The tableview will call this method when trying

// to play a song.

- (NSString *)songSelected

{    return [songs objectAtIndex:[songTable selectedRow]]; }

// Stop the table's rows from being editable when we double-click on them

- (BOOL)tableView:(NSTableView *)tableView shouldEditTableColumn:(NSTableColumn *)tableColumn row:(int)row

{    return NO; }

// when a drag-and-drop operation comes through, and a filename is being dropped on the table,

// we need to tell the table where to put the new filename (right at the end of the table).

// This controls the visual feedback to the user on where their drop will go.

- (NSDragOperation)tableView:(NSTableView*)tv validateDrop:(id <NSDraggingInfo>)info proposedRow:(int)row proposedDropOperation:(NSTableViewDropOperation)op

{

    [tv setDropRow:[tv numberOfRows] dropOperation:NSTableViewDropAbove];

    return NSTableViewDropAbove;

}

// This routine does the actual processing for a drag-and-drop operation on a tableview.

// As the tableview's data source, we get this call when it's time to update our backend data.

- (BOOL)tableView:(NSTableView*)tv acceptDrop:(id <NSDraggingInfo>)info row:(int)row dropOperation:(NSTableViewDropOperation)op

{

    // Get the drag-n-drop pasteboard

    NSPasteboard *myPasteboard=[info draggingPasteboard];

    // What type of data are we going to allow to be dragged?  The pasteboard

    // might contain different formats

    NSArray *typeArray=[NSArray arrayWithObjects:NSFilenamesPboardType,nil];

    NSString *filePath,*availableType;

    NSArray *filesList;

    int i;

    // find the best match of the types we'll accept and what's actually on the pasteboard

    availableType=[myPasteboard availableTypeFromArray:typeArray];

    // In the file format type that we're working with, get all data on the pasteboard

    filesList=[myPasteboard propertyListForType:availableType];

    // Insert the MP3 filenames into our songs array

    for (i=0;i<[filesList count];i++)

    {

        filePath=[filesList objectAtIndex:i];

        [songs insertObject:filePath atIndex:row+i];

    }

    // We've updated our array.  Now reload the table.

    [songTable reloadData];

    // Select the last song.

    [songTable selectRow:row+i-1 byExtendingSelection:NO];

    return YES;

}

@end