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@@ -29,6 +29,8 @@ var Reveal = (function(){
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// Enable the slide overview mode
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// Enable the slide overview mode
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overview: true,
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overview: true,
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+ center: false,
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+
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// Loop the presentation
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// Loop the presentation
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loop: false,
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loop: false,
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@@ -264,6 +266,10 @@ var Reveal = (function(){
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// Updates the presentation to match the current configuration values
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// Updates the presentation to match the current configuration values
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configure();
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configure();
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+ // Force an initial layout, will thereafter be invoked as the window
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+ // is resized
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+ layout();
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+
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// Read the initial hash
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// Read the initial hash
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readURL();
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readURL();
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@@ -301,6 +307,10 @@ var Reveal = (function(){
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dom.wrapper.classList.add( config.transition );
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dom.wrapper.classList.add( config.transition );
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}
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}
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+ if( config.center ) {
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+ dom.wrapper.classList.add( 'center' );
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+ }
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+
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if( config.mouseWheel ) {
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if( config.mouseWheel ) {
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document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
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document.addEventListener( 'DOMMouseScroll', onDocumentMouseScroll, false ); // FF
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document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
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document.addEventListener( 'mousewheel', onDocumentMouseScroll, false );
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@@ -332,6 +342,7 @@ var Reveal = (function(){
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document.addEventListener( 'touchmove', onDocumentTouchMove, false );
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document.addEventListener( 'touchmove', onDocumentTouchMove, false );
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document.addEventListener( 'touchend', onDocumentTouchEnd, false );
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document.addEventListener( 'touchend', onDocumentTouchEnd, false );
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window.addEventListener( 'hashchange', onWindowHashChange, false );
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window.addEventListener( 'hashchange', onWindowHashChange, false );
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+ window.addEventListener( 'resize', onWindowResize, false );
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if( config.keyboard ) {
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if( config.keyboard ) {
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document.addEventListener( 'keydown', onDocumentKeyDown, false );
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document.addEventListener( 'keydown', onDocumentKeyDown, false );
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@@ -358,6 +369,7 @@ var Reveal = (function(){
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document.removeEventListener( 'touchmove', onDocumentTouchMove, false );
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document.removeEventListener( 'touchmove', onDocumentTouchMove, false );
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document.removeEventListener( 'touchend', onDocumentTouchEnd, false );
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document.removeEventListener( 'touchend', onDocumentTouchEnd, false );
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window.removeEventListener( 'hashchange', onWindowHashChange, false );
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window.removeEventListener( 'hashchange', onWindowHashChange, false );
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+ window.removeEventListener( 'resize', onWindowResize, false );
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if ( config.progress && dom.progress ) {
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if ( config.progress && dom.progress ) {
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dom.progress.removeEventListener( 'click', preventAndForward( onProgressClick ), false );
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dom.progress.removeEventListener( 'click', preventAndForward( onProgressClick ), false );
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@@ -448,6 +460,33 @@ var Reveal = (function(){
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}
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}
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}
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}
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+ /**
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+ * Applies JavaScript-controlled layout rules to the
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+ * presentation.
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+ */
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+ function layout() {
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+ if( config.center ) {
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+
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+ // Select all slides, vertical and horizontal
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+ var slides = Array.prototype.slice.call( document.querySelectorAll( '.reveal .slides section' ) );
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+
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+ // Determine the minimum top offset for slides
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+ var minTop = -dom.wrapper.offsetHeight / 2;
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+
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+ for( var i = 0, len = slides.length; i < len; i++ ) {
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+ var slide = slides[ i ];
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+
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+ if( slide.classList.contains( 'stack' ) ) {
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+ slide.style.marginTop = 0;
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+ }
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+ else {
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+ slide.style.marginTop = Math.max( - ( slide.offsetHeight / 2 ) - 20, minTop ) + 'px';
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+ }
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+ }
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+
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+ }
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+ }
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+
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/**
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/**
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* Displays the overview of slides (quick nav) by
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* Displays the overview of slides (quick nav) by
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* scaling down and arranging all slide elements.
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* scaling down and arranging all slide elements.
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@@ -643,6 +682,8 @@ var Reveal = (function(){
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indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
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indexh = updateSlides( HORIZONTAL_SLIDES_SELECTOR, h === undefined ? indexh : h );
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indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
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indexv = updateSlides( VERTICAL_SLIDES_SELECTOR, v === undefined ? indexv : v );
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+ layout();
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+
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// Apply the new state
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// Apply the new state
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stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
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stateLoop: for( var i = 0, len = state.length; i < len; i++ ) {
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// Check if this state existed on the previous slide. If it
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// Check if this state existed on the previous slide. If it
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@@ -1284,13 +1325,18 @@ var Reveal = (function(){
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/**
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/**
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* Handler for the window level 'hashchange' event.
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* Handler for the window level 'hashchange' event.
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- *
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- * @param {Object} event
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*/
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*/
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function onWindowHashChange( event ) {
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function onWindowHashChange( event ) {
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readURL();
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readURL();
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}
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}
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+ /**
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+ * Handler for the window level 'resize' event.
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+ */
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+ function onWindowResize( event ) {
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+ layout();
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+ }
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+
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/**
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/**
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* Invoked when a slide is and we're in the overview.
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* Invoked when a slide is and we're in the overview.
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*/
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*/
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