/*

     File: SlideshowWindowController.m

 Abstract: Window Controller Class for CocoaSlides Slideshow Window

  Version: 1.5

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 */

#import "SlideshowWindowController.h"

#import "Asset.h"

#import "AssetCollection.h"

#import "AssetCollectionView.h"

#import "SlideshowView.h"

@implementation SlideshowWindowController

- (void)startSlideshowTimer {

    if (slideshowTimer == nil && [self slideshowInterval] > 0.0) {

        // Schedule an ordinary NSTimer that will invoke -advanceSlideshow: at regular intervals, each time we need to advance to the next slide.

        slideshowTimer = [[NSTimer scheduledTimerWithTimeInterval:[self slideshowInterval] target:self selector:@selector(advanceSlideshow:) userInfo:nil repeats:YES] retain];

    }

}

- (void)stopSlideshowTimer {

    if (slideshowTimer != nil) {

        // Cancel and release the slideshow advance timer.

        [slideshowTimer invalidate];

        [slideshowTimer release];

        slideshowTimer = nil;

    }

}

- (void)dealloc {

    [self stopSlideshowTimer];

    [assetCollection release];

    [super dealloc];

}

- (AssetCollection *)assetCollection {

    return assetCollection;

}

- (void)setAssetCollection:(AssetCollection *)newAssetCollection {

    if (assetCollection != newAssetCollection) {

        [assetCollection release];

        assetCollection = [newAssetCollection retain];

    }

}

- (NSTimeInterval)slideshowInterval {

    return slideshowInterval;

}

- (void)setSlideshowInterval:(NSTimeInterval)newSlideshowInterval {

    if (slideshowInterval != newSlideshowInterval) {

        // Stop the slideshow, change the interval as requested, and then restart the slideshow (if it was running already).

        [self stopSlideshowTimer];

        slideshowInterval = newSlideshowInterval;

        if (slideshowInterval > 0.0) {

            [self startSlideshowTimer];

        }

    }

}

- (void)awakeFromNib {

    // Ask for the slideshowView and its descendants to be rendered and animated using layers.  Note that this is the only part of this code sample that refers in any way to the existence of layers. -- AppKit takes care of the implications of this automatically!  Interface Builder 3.0 even allows the per-view "wantsLayer" flag to be set in the .nib, which would allow removing these two lines of code.

    [slideshowView setWantsLayer:YES];

    // Set default interval for advancing to the next slide.

    [self setSlideshowInterval:3.0];

}

- (void)advanceSlideshow:(NSTimer *)timer {

    NSArray *assets = [assetCollection assets];

    NSUInteger count = [assets count];

    if (assets != nil && count > 0 && [[self window] isVisible]) {

        // Find the next Asset in the slideshow.

        NSUInteger startIndex = slideshowCurrentAsset ? [assets indexOfObject:slideshowCurrentAsset] : 0;

        NSUInteger index = (startIndex + 1) % count;

        while (index != startIndex) {

            Asset *asset = [assets objectAtIndex:index];

            if ([asset includedInSlideshow]) {

                // Load the full-size image.

                NSImage *image = [[[NSImage alloc] initWithContentsOfURL:[asset url]] autorelease];

                // Ask our SlideshowView to transition to the image.

                [slideshowView transitionToImage:image];

                // Remember which slide we're now displaying.

                [slideshowCurrentAsset release];

                slideshowCurrentAsset = [asset retain];

                return;

            }

            index = (index + 1) % count;

        }

    }

}

@end