/*

File: photo-gallery.js

Abstract: JavaScript file containing logic related to creating the photo

  gallery, and handling keyboard and touch events.

Version: 1.1

Disclaimer: IMPORTANT:  This Apple software is supplied to you by 

Apple 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 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.

Copyright (C) 2010 Apple Inc. All Rights Reserved.

*/

// The Gallery object manages the entire photo gallery. It creates the slide show,

// and hooks up event listeners for user input.

function Gallery(container)

{

  this.galleryContainer = container;

  this.photoContainer = document.getElementById('photo-container');

  // Create the slide show. It does most of the heavy lifting in the gallery.

  this.slideShow = new Slideshow(this.photoContainer, this.galleryContainer, cImageAssets);

  // Register touchEnd listener for iPhone/iPad

  this.photoContainer.addEventListener('touchend', this, false);

  // Register click and keyboard listeners for desktop

  this.photoContainer.addEventListener('click', this, false);

  window.addEventListener('keydown', this, false);

}

Gallery.prototype.handleEvent = function (event) {

  var target = event.target;

  switch (event.type) {

    case "touchend":

      this.slideShow.nextImage(event.shiftKey);

      event.preventDefault(); // prevent click from firing, so we don't advance twice.

      return;

    case "click":

      this.slideShow.nextImage(event.shiftKey);

      break;

    case "keydown":

      if (event.keyCode == 39) {  // RIGHT

        event.preventDefault();

        if (!this.slideShow.flipped)

          this.slideShow.nextImage(event.shiftKey);

      } else if (event.keyCode == 37) {  // LEFT

        event.preventDefault();

        if (!this.slideShow.flipped)

          this.slideShow.previousImage(event.shiftKey);

      } else if (event.keyCode == 13) { // RETURN/ENTER

        event.preventDefault();

        this.slideShow.toggleFlip();

      }

      break;

  }

};

// This method finds all the elements with the "image-container" class in the document, and adds

// a click event listener to each one.

function makeImagesClickable()

{

  var lightboxContainers = document.querySelectorAll('.image-container');

  for (var i = 0; i < lightboxContainers.length; ++i) {

    var curContainer = lightboxContainers[i];

    // ".bind()" calls Function.prototype.bind (in utilities.js); it's a convenient way to

    // hook up an event listener with 'this' as the target, inside a loop.

    curContainer.addEventListener('click', imageClicked.bind(this, curContainer), false);

  }

}

function showOverlay()

{

  var overlay = document.getElementById('overlay');

  overlay.removeClassName('hidden');

  // The "setTimeout" ensures that the initial style is rendered, and hence allows the transition to run.

  window.setTimeout(function() {

    overlay.addClassName('visible');

  }, 0);

}

var gGallery;

function imageClicked()

{

  if (gGallery)

    return;

  var galleryContainer = document.getElementById('gallery-container');

  gGallery = new Gallery(galleryContainer);

  showOverlay();

}

// The preferred way to call a function when the page loads.

window.addEventListener('load', makeImagesClickable, false);