
//>>excludeStart("jqmBuildExclude", pragmas.jqmBuildExclude);
//>>description: Animated page change core logic and sequence handlers
//>>label: Transition Core
//>>group: Transitions
//>>css.structure: ../css/structure/jquery.mobile.transition.css
//>>css.theme: ../css/themes/default/jquery.mobile.theme.css

define( [ "jquery", "./jquery.mobile.core" ], function( jQuery ) {
//>>excludeEnd("jqmBuildExclude");
(function( $, window, undefined ) {

var createHandler = function( sequential ) {

	// Default to sequential
	if ( sequential === undefined ) {
		sequential = true;
	}

	return function( name, reverse, $to, $from ) {

		var deferred = new $.Deferred(),
			reverseClass = reverse ? " reverse" : "",
			active	= $.mobile.urlHistory.getActive(),
			toScroll = active.lastScroll || $.mobile.defaultHomeScroll,
			screenHeight = $.mobile.getScreenHeight(),
			maxTransitionOverride = $.mobile.maxTransitionWidth !== false && $.mobile.$window.width() > $.mobile.maxTransitionWidth,
			none = !$.support.cssTransitions || maxTransitionOverride || !name || name === "none" || Math.max( $.mobile.$window.scrollTop(), toScroll ) > $.mobile.getMaxScrollForTransition(),
			toPreClass = " ui-page-pre-in",
			toggleViewportClass = function() {
				$.mobile.pageContainer.toggleClass( "ui-mobile-viewport-transitioning viewport-" + name );
			},
			scrollPage = function() {
				// Prevent blinking on page scrolling in Tizen/Android devices.
				// Don't scoll window, when current scroll top(scrollTop()) is already at toScroll,
				// or when current scroll top is 0 and toScroll is same to defaultHomeScroll
				// (which means the top position of page). In these case, page scrolling is not needed.
				var st = $.mobile.$window.scrollTop();
				if( st === toScroll || ( $.mobile.defaultHomeScroll === toScroll && st == 0 ) ) {
					return;
				}

				// By using scrollTo instead of silentScroll, we can keep things better in order
				// Just to be precautios, disable scrollstart listening like silentScroll would
				$.event.special.scrollstart.enabled = false;

				window.scrollTo( 0, toScroll );

				// reenable scrollstart listening like silentScroll would
				setTimeout( function() {
					$.event.special.scrollstart.enabled = true;
				}, 150 );
			},
			cleanFrom = function() {
				$from
					.removeClass( $.mobile.activePageClass + " out in reverse " + name )
					.height( "" );
			},
			startOut = function() {
				// if it's not sequential, call the doneOut transition to start the TO page animating in simultaneously
				if ( !sequential ) {
					doneOut();
				}
				else {
					$from.animationComplete( doneOut );
				}

				// Set the from page's height and start it transitioning out
				// Note: setting an explicit height helps eliminate tiling in the transitions
				$from
					.height( screenHeight + $.mobile.$window.scrollTop() )
					.addClass( name + " out" + reverseClass );
			},

			doneOut = function() {

				if ( $from && sequential ) {
					cleanFrom();
				}

				startIn();
			},

			startIn = function() {

				// Prevent flickering in phonegap container: see comments at #4024 regarding iOS
				$to.css( "z-index", -10 );

				$to.addClass( $.mobile.activePageClass + toPreClass );

				// Send focus to page as it is now display: block
				$.mobile.focusPage( $to );

				// Set to page height
				$to.height( screenHeight + toScroll );

				scrollPage();

				// Restores visibility of the new page: added together with $to.css( "z-index", -10 );
				$to.css( "z-index", "" );

				if ( !none ) {
					$to.animationComplete( doneIn );
				}

				$to
					.removeClass( toPreClass )
					.addClass( name + " in" + reverseClass );

				if ( none ) {
					setTimeout( doneIn, 0 );
				}

			},

			doneIn = function() {

				if ( !sequential ) {

					if ( $from ) {
						cleanFrom();
					}
				}

				$to
					.removeClass( "out in reverse " + name )
					.height( "" );

				toggleViewportClass();

				// In some browsers (iOS5), 3D transitions block the ability to scroll to the desired location during transition
				// This ensures we jump to that spot after the fact, if we aren't there already.
				if ( $.mobile.$window.scrollTop() !== toScroll ) {
					scrollPage();
				}

				deferred.resolve( name, reverse, $to, $from, true );
			};

		toggleViewportClass();

		if ( $from && !none ) {
			startOut();
		}
		else {
			doneOut();
		}

		return deferred.promise();
	};
};

// generate the handlers from the above
var sequentialHandler = createHandler(),
	simultaneousHandler = createHandler( false ),
	defaultGetMaxScrollForTransition = function() {
		return $.mobile.getScreenHeight() * 3;
	};

// Make our transition handler the public default.
$.mobile.defaultTransitionHandler = sequentialHandler;

//transition handler dictionary for 3rd party transitions
$.mobile.transitionHandlers = {
	"default": $.mobile.defaultTransitionHandler,
	"sequential": sequentialHandler,
	"simultaneous": simultaneousHandler
};

$.mobile.transitionFallbacks = {};

// If transition is defined, check if css 3D transforms are supported, and if not, if a fallback is specified
$.mobile._maybeDegradeTransition = function( transition ) {
		if ( transition && !$.support.cssTransform3d && $.mobile.transitionFallbacks[ transition ] ) {
			transition = $.mobile.transitionFallbacks[ transition ];
		}

		return transition;
};

// Set the getMaxScrollForTransition to default if no implementation was set by user
$.mobile.getMaxScrollForTransition = $.mobile.getMaxScrollForTransition || defaultGetMaxScrollForTransition;
})( jQuery, this );
//>>excludeStart("jqmBuildExclude", pragmas.jqmBuildExclude);
});
//>>excludeEnd("jqmBuildExclude");