/*

     File: IconViewController.m 

 Abstract: Controller object for our icon collection view.

  Version: 1.5 

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION 

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 */

#import "IconViewController.h"

// key values for the icon view dictionary

NSString *KEY_NAME = @"name";

NSString *KEY_ICON = @"icon";

// notification for indicating file system content has been received

NSString *kReceivedContentNotification = @"ReceivedContentNotification";

@interface IconViewBox : NSBox

@end

@implementation IconViewBox

- (NSView *)hitTest:(NSPoint)aPoint

{

    // don't allow any mouse clicks for subviews in this NSBox

    return nil;

}

@end

@interface IconViewController ()

@property (readwrite, strong) IBOutlet NSArrayController *iconArrayController;

@property (readwrite, strong) NSMutableArray *icons;

@end

@implementation IconViewController

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

//  awakeFromNib

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

- (void)awakeFromNib

{

    // listen for changes in the url for this view

    [self addObserver:  self

                        forKeyPath:@"url"

                        options:(NSKeyValueObservingOptionNew | NSKeyValueObservingOptionOld) 

                        context:NULL];

}

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

//  dealloc

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

- (void)dealloc

{

    [self removeObserver:self forKeyPath:@"url"];

}

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

//  updateIcons:iconArray

//

//  The incoming object is the NSArray of file system objects to display.

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

- (void)updateIcons:(id)iconArray

{

    self.icons = iconArray;

    [[NSNotificationCenter defaultCenter] postNotificationName:kReceivedContentNotification object:nil];

}

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

//  gatherContents:inObject

//

//  Gathering the contents and their icons could be expensive.

//  This method is being called on a separate thread to avoid blocking the UI.

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

- (void)gatherContents:(id)inObject

{

    @autoreleasepool {

        NSMutableArray *contentArray = [[NSMutableArray alloc] init];

        NSArray *fileURLs = [[NSFileManager defaultManager] contentsOfDirectoryAtURL:self.url

                                                          includingPropertiesForKeys:[NSArray array]

                                                                             options:0

                                                                        error:nil];

        if (fileURLs)

        {

            for (NSURL *element in fileURLs)

            {

                NSString *elementNameStr = nil;

                NSImage *elementIcon = [[NSWorkspace sharedWorkspace] iconForFile:[element path]];

                // only allow visible objects

                NSNumber *hiddenFlag = nil;

                if ([element getResourceValue:&hiddenFlag forKey:NSURLIsHiddenKey error:nil])

                {

                    if (![hiddenFlag boolValue])

                    {

                        if ([element getResourceValue:&elementNameStr forKey:NSURLNameKey error:nil])

                        {

                            // file system object is visible so add to our array

                            [contentArray addObject:[NSMutableDictionary dictionaryWithObjectsAndKeys:

                                                        elementIcon, KEY_ICON,

                                                        elementNameStr, KEY_NAME,

                                                     nil]];

                        }

                    }

                }

            }

        }

        // call back on the main thread to update the icons in our view

        [self performSelectorOnMainThread:@selector(updateIcons:) withObject:contentArray waitUntilDone:YES];

    }

}

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

//  observeValueForKeyPath:ofObject:change:context

//

//  Listen for changes in the file url.

//  Given a url, obtain its contents and add only the invisible items to the collection.

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

- (void)observeValueForKeyPath:(NSString *)keyPath

                                ofObject:(id)object 

                                change:(NSDictionary *)change 

                                context:(void *)context

{

    // build our directory contents on a separate thread,

    // some portions are from disk which could get expensive depending on the size

    //

    [NSThread detachNewThreadSelector:  @selector(gatherContents:)

                                        toTarget:self       // we are the target

                                        withObject:self.url];

}

@end