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35 results

theme.js

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  • theme.js 53.09 KiB
    /* global _wpThemeSettings, confirm */
    window.wp = window.wp || {};
    
    ( function($) {
    
    // Set up our namespace...
    var themes, l10n;
    themes = wp.themes = wp.themes || {};
    
    // Store the theme data and settings for organized and quick access
    // themes.data.settings, themes.data.themes, themes.data.l10n
    themes.data = _wpThemeSettings;
    l10n = themes.data.l10n;
    
    // Shortcut for isInstall check
    themes.isInstall = !! themes.data.settings.isInstall;
    
    // Setup app structure
    _.extend( themes, { model: {}, view: {}, routes: {}, router: {}, template: wp.template });
    
    themes.Model = Backbone.Model.extend({
    	// Adds attributes to the default data coming through the .org themes api
    	// Map `id` to `slug` for shared code
    	initialize: function() {
    		var description;
    
    		// If theme is already installed, set an attribute.
    		if ( _.indexOf( themes.data.installedThemes, this.get( 'slug' ) ) !== -1 ) {
    			this.set({ installed: true });
    		}
    
    		// Set the attributes
    		this.set({
    			// slug is for installation, id is for existing.
    			id: this.get( 'slug' ) || this.get( 'id' )
    		});
    
    		// Map `section.description` to `description`
    		// as the API sometimes returns it differently
    		if ( this.has( 'sections' ) ) {
    			description = this.get( 'sections' ).description;
    			this.set({ description: description });
    		}
    	}
    });
    
    // Main view controller for themes.php
    // Unifies and renders all available views
    themes.view.Appearance = wp.Backbone.View.extend({
    
    	el: '#wpbody-content .wrap .theme-browser',
    
    	window: $( window ),
    	// Pagination instance
    	page: 0,
    
    	// Sets up a throttler for binding to 'scroll'
    	initialize: function( options ) {
    		// Scroller checks how far the scroll position is
    		_.bindAll( this, 'scroller' );
    
    		this.SearchView = options.SearchView ? options.SearchView : themes.view.Search;
    		// Bind to the scroll event and throttle
    		// the results from this.scroller
    		this.window.bind( 'scroll', _.throttle( this.scroller, 300 ) );
    	},
    
    	// Main render control
    	render: function() {
    		// Setup the main theme view
    		// with the current theme collection
    		this.view = new themes.view.Themes({
    			collection: this.collection,
    			parent: this
    		});
    
    		// Render search form.
    		this.search();
    
    		this.$el.removeClass( 'search-loading' );
    
    		// Render and append
    		this.view.render();
    		this.$el.empty().append( this.view.el ).addClass( 'rendered' );
    	},
    
    	// Defines search element container
    	searchContainer: $( '.search-form' ),
    
    	// Search input and view
    	// for current theme collection
    	search: function() {
    		var view,
    			self = this;
    
    		// Don't render the search if there is only one theme
    		if ( themes.data.themes.length === 1 ) {
    			return;
    		}
    
    		view = new this.SearchView({
    			collection: self.collection,
    			parent: this
    		});
    		self.searchView = view;
    
    		// Render and append after screen title
    		view.render();
    		this.searchContainer
    			.append( $.parseHTML( '<label class="screen-reader-text" for="wp-filter-search-input">' + l10n.search + '</label>' ) )
    			.append( view.el )
    			.on( 'submit', function( event ) {
    				event.preventDefault();
    			});
    	},
    
    	// Checks when the user gets close to the bottom
    	// of the mage and triggers a theme:scroll event
    	scroller: function() {
    		var self = this,
    			bottom, threshold;
    
    		bottom = this.window.scrollTop() + self.window.height();
    		threshold = self.$el.offset().top + self.$el.outerHeight( false ) - self.window.height();
    		threshold = Math.round( threshold * 0.9 );
    
    		if ( bottom > threshold ) {
    			this.trigger( 'theme:scroll' );
    		}
    	}
    });
    
    // Set up the Collection for our theme data
    // @has 'id' 'name' 'screenshot' 'author' 'authorURI' 'version' 'active' ...
    themes.Collection = Backbone.Collection.extend({
    
    	model: themes.Model,
    
    	// Search terms
    	terms: '',
    
    	// Controls searching on the current theme collection
    	// and triggers an update event
    	doSearch: function( value ) {
    
    		// Don't do anything if we've already done this search
    		// Useful because the Search handler fires multiple times per keystroke
    		if ( this.terms === value ) {
    			return;
    		}
    
    		// Updates terms with the value passed
    		this.terms = value;
    
    		// If we have terms, run a search...
    		if ( this.terms.length > 0 ) {
    			this.search( this.terms );
    		}
    
    		// If search is blank, show all themes
    		// Useful for resetting the views when you clean the input
    		if ( this.terms === '' ) {
    			this.reset( themes.data.themes );
    			$( 'body' ).removeClass( 'no-results' );
    		}
    
    		// Trigger a 'themes:update' event
    		this.trigger( 'themes:update' );
    	},
    
    	// Performs a search within the collection
    	// @uses RegExp
    	search: function( term ) {
    		var match, results, haystack, name, description, author;
    
    		// Start with a full collection
    		this.reset( themes.data.themes, { silent: true } );
    
    		// Escape the term string for RegExp meta characters
    		term = term.replace( /[-\/\\^$*+?.()|[\]{}]/g, '\\$&' );
    
    		// Consider spaces as word delimiters and match the whole string
    		// so matching terms can be combined
    		term = term.replace( / /g, ')(?=.*' );
    		match = new RegExp( '^(?=.*' + term + ').+', 'i' );
    
    		// Find results
    		// _.filter and .test
    		results = this.filter( function( data ) {
    			name        = data.get( 'name' ).replace( /(<([^>]+)>)/ig, '' );
    			description = data.get( 'description' ).replace( /(<([^>]+)>)/ig, '' );
    			author      = data.get( 'author' ).replace( /(<([^>]+)>)/ig, '' );
    
    			haystack = _.union( [ name, data.get( 'id' ), description, author, data.get( 'tags' ) ] );
    
    			if ( match.test( data.get( 'author' ) ) && term.length > 2 ) {
    				data.set( 'displayAuthor', true );
    			}
    
    			return match.test( haystack );
    		});
    
    		if ( results.length === 0 ) {
    			this.trigger( 'query:empty' );
    		} else {
    			$( 'body' ).removeClass( 'no-results' );
    		}
    
    		this.reset( results );
    	},
    
    	// Paginates the collection with a helper method
    	// that slices the collection
    	paginate: function( instance ) {
    		var collection = this;
    		instance = instance || 0;
    
    		// Themes per instance are set at 20
    		collection = _( collection.rest( 20 * instance ) );
    		collection = _( collection.first( 20 ) );
    
    		return collection;
    	},
    
    	count: false,
    
    	// Handles requests for more themes
    	// and caches results
    	//
    	// When we are missing a cache object we fire an apiCall()
    	// which triggers events of `query:success` or `query:fail`
    	query: function( request ) {
    		/**
    		 * @static
    		 * @type Array
    		 */
    		var queries = this.queries,
    			self = this,
    			query, isPaginated, count;
    
    		// Store current query request args
    		// for later use with the event `theme:end`
    		this.currentQuery.request = request;
    
    		// Search the query cache for matches.
    		query = _.find( queries, function( query ) {
    			return _.isEqual( query.request, request );
    		});
    
    		// If the request matches the stored currentQuery.request
    		// it means we have a paginated request.
    		isPaginated = _.has( request, 'page' );
    
    		// Reset the internal api page counter for non paginated queries.
    		if ( ! isPaginated ) {
    			this.currentQuery.page = 1;
    		}
    
    		// Otherwise, send a new API call and add it to the cache.
    		if ( ! query && ! isPaginated ) {
    			query = this.apiCall( request ).done( function( data ) {
    
    				// Update the collection with the queried data.
    				if ( data.themes ) {
    					self.reset( data.themes );
    					count = data.info.results;
    					// Store the results and the query request
    					queries.push( { themes: data.themes, request: request, total: count } );
    				}
    
    				// Trigger a collection refresh event
    				// and a `query:success` event with a `count` argument.
    				self.trigger( 'themes:update' );
    				self.trigger( 'query:success', count );
    
    				if ( data.themes && data.themes.length === 0 ) {
    					self.trigger( 'query:empty' );
    				}
    
    			}).fail( function() {
    				self.trigger( 'query:fail' );
    			});
    		} else {
    			// If it's a paginated request we need to fetch more themes...
    			if ( isPaginated ) {
    				return this.apiCall( request, isPaginated ).done( function( data ) {
    					// Add the new themes to the current collection
    					// @todo update counter
    					self.add( data.themes );
    					self.trigger( 'query:success' );
    
    					// We are done loading themes for now.
    					self.loadingThemes = false;
    
    				}).fail( function() {
    					self.trigger( 'query:fail' );
    				});
    			}
    
    			if ( query.themes.length === 0 ) {
    				self.trigger( 'query:empty' );
    			} else {
    				$( 'body' ).removeClass( 'no-results' );
    			}
    
    			// Only trigger an update event since we already have the themes
    			// on our cached object
    			if ( _.isNumber( query.total ) ) {
    				this.count = query.total;
    			}
    
    			this.reset( query.themes );
    			if ( ! query.total ) {
    				this.count = this.length;
    			}
    
    			this.trigger( 'themes:update' );
    			this.trigger( 'query:success', this.count );
    		}
    	},
    
    	// Local cache array for API queries
    	queries: [],
    
    	// Keep track of current query so we can handle pagination
    	currentQuery: {
    		page: 1,
    		request: {}
    	},
    
    	// Send request to api.wordpress.org/themes
    	apiCall: function( request, paginated ) {
    		return wp.ajax.send( 'query-themes', {
    			data: {
    			// Request data
    				request: _.extend({
    					per_page: 100,
    					fields: {
    						description: true,
    						tested: true,
    						requires: true,
    						rating: true,
    						downloaded: true,
    						downloadLink: true,
    						last_updated: true,
    						homepage: true,
    						num_ratings: true
    					}
    				}, request)
    			},
    
    			beforeSend: function() {
    				if ( ! paginated ) {
    					// Spin it
    					$( 'body' ).addClass( 'loading-content' ).removeClass( 'no-results' );
    				}
    			}
    		});
    	},
    
    	// Static status controller for when we are loading themes.
    	loadingThemes: false
    });
    
    // This is the view that controls each theme item
    // that will be displayed on the screen
    themes.view.Theme = wp.Backbone.View.extend({
    
    	// Wrap theme data on a div.theme element
    	className: 'theme',
    
    	// Reflects which theme view we have
    	// 'grid' (default) or 'detail'
    	state: 'grid',
    
    	// The HTML template for each element to be rendered
    	html: themes.template( 'theme' ),
    
    	events: {
    		'click': themes.isInstall ? 'preview': 'expand',
    		'keydown': themes.isInstall ? 'preview': 'expand',
    		'touchend': themes.isInstall ? 'preview': 'expand',
    		'keyup': 'addFocus',
    		'touchmove': 'preventExpand',
    		'click .theme-install': 'installTheme',
    		'click .update-message': 'updateTheme'
    	},
    
    	touchDrag: false,
    
    	initialize: function() {
    		this.model.on( 'change', this.render, this );
    	},
    
    	render: function() {
    		var data = this.model.toJSON();
    
    		// Render themes using the html template
    		this.$el.html( this.html( data ) ).attr({
    			tabindex: 0,
    			'aria-describedby' : data.id + '-action ' + data.id + '-name',
    			'data-slug': data.id
    		});
    
    		// Renders active theme styles
    		this.activeTheme();
    
    		if ( this.model.get( 'displayAuthor' ) ) {
    			this.$el.addClass( 'display-author' );
    		}
    	},
    
    	// Adds a class to the currently active theme
    	// and to the overlay in detailed view mode
    	activeTheme: function() {
    		if ( this.model.get( 'active' ) ) {
    			this.$el.addClass( 'active' );
    		}
    	},
    
    	// Add class of focus to the theme we are focused on.
    	addFocus: function() {
    		var $themeToFocus = ( $( ':focus' ).hasClass( 'theme' ) ) ? $( ':focus' ) : $(':focus').parents('.theme');
    
    		$('.theme.focus').removeClass('focus');
    		$themeToFocus.addClass('focus');
    	},
    
    	// Single theme overlay screen
    	// It's shown when clicking a theme
    	expand: function( event ) {
    		var self = this;
    
    		event = event || window.event;
    
    		// 'enter' and 'space' keys expand the details view when a theme is :focused
    		if ( event.type === 'keydown' && ( event.which !== 13 && event.which !== 32 ) ) {
    			return;
    		}
    
    		// Bail if the user scrolled on a touch device
    		if ( this.touchDrag === true ) {
    			return this.touchDrag = false;
    		}
    
    		// Prevent the modal from showing when the user clicks
    		// one of the direct action buttons
    		if ( $( event.target ).is( '.theme-actions a' ) ) {
    			return;
    		}
    
    		// Prevent the modal from showing when the user clicks one of the direct action buttons.
    		if ( $( event.target ).is( '.theme-actions a, .update-message, .button-link, .notice-dismiss' ) ) {
    			return;
    		}
    
    		// Set focused theme to current element
    		themes.focusedTheme = this.$el;
    
    		this.trigger( 'theme:expand', self.model.cid );
    	},
    
    	preventExpand: function() {
    		this.touchDrag = true;
    	},
    
    	preview: function( event ) {
    		var self = this,
    			current, preview;
    
    		event = event || window.event;
    
    		// Bail if the user scrolled on a touch device
    		if ( this.touchDrag === true ) {
    			return this.touchDrag = false;
    		}
    
    		// Allow direct link path to installing a theme.
    		if ( $( event.target ).not( '.install-theme-preview' ).parents( '.theme-actions' ).length ) {
    			return;
    		}
    
    		// 'enter' and 'space' keys expand the details view when a theme is :focused
    		if ( event.type === 'keydown' && ( event.which !== 13 && event.which !== 32 ) ) {
    			return;
    		}
    
    		// pressing enter while focused on the buttons shouldn't open the preview
    		if ( event.type === 'keydown' && event.which !== 13 && $( ':focus' ).hasClass( 'button' ) ) {
    			return;
    		}
    
    		event.preventDefault();
    
    		event = event || window.event;
    
    		// Set focus to current theme.
    		themes.focusedTheme = this.$el;
    
    		// Construct a new Preview view.
    		themes.preview = preview = new themes.view.Preview({
    			model: this.model
    		});
    
    		// Render the view and append it.
    		preview.render();
    		this.setNavButtonsState();
    
    		// Hide previous/next navigation if there is only one theme
    		if ( this.model.collection.length === 1 ) {
    			preview.$el.addClass( 'no-navigation' );
    		} else {
    			preview.$el.removeClass( 'no-navigation' );
    		}
    
    		// Append preview
    		$( 'div.wrap' ).append( preview.el );
    
    		// Listen to our preview object
    		// for `theme:next` and `theme:previous` events.
    		this.listenTo( preview, 'theme:next', function() {
    
    			// Keep local track of current theme model.
    			current = self.model;
    
    			// If we have ventured away from current model update the current model position.
    			if ( ! _.isUndefined( self.current ) ) {
    				current = self.current;
    			}
    
    			// Get next theme model.
    			self.current = self.model.collection.at( self.model.collection.indexOf( current ) + 1 );
    
    			// If we have no more themes, bail.
    			if ( _.isUndefined( self.current ) ) {
    				self.options.parent.parent.trigger( 'theme:end' );
    				return self.current = current;
    			}
    
    			preview.model = self.current;
    
    			// Render and append.
    			preview.render();
    			this.setNavButtonsState();
    			$( '.next-theme' ).focus();
    		})
    		.listenTo( preview, 'theme:previous', function() {
    
    			// Keep track of current theme model.
    			current = self.model;
    
    			// Bail early if we are at the beginning of the collection
    			if ( self.model.collection.indexOf( self.current ) === 0 ) {
    				return;
    			}
    
    			// If we have ventured away from current model update the current model position.
    			if ( ! _.isUndefined( self.current ) ) {
    				current = self.current;
    			}
    
    			// Get previous theme model.
    			self.current = self.model.collection.at( self.model.collection.indexOf( current ) - 1 );
    
    			// If we have no more themes, bail.
    			if ( _.isUndefined( self.current ) ) {
    				return;
    			}
    
    			preview.model = self.current;
    
    			// Render and append.
    			preview.render();
    			this.setNavButtonsState();
    			$( '.previous-theme' ).focus();
    		});
    
    		this.listenTo( preview, 'preview:close', function() {
    			self.current = self.model;
    		});
    
    	},
    
    	// Handles .disabled classes for previous/next buttons in theme installer preview
    	setNavButtonsState: function() {
    		var $themeInstaller = $( '.theme-install-overlay' ),
    			current = _.isUndefined( this.current ) ? this.model : this.current;
    
    		// Disable previous at the zero position
    		if ( 0 === this.model.collection.indexOf( current ) ) {
    			$themeInstaller.find( '.previous-theme' ).addClass( 'disabled' );
    		}
    
    		// Disable next if the next model is undefined
    		if ( _.isUndefined( this.model.collection.at( this.model.collection.indexOf( current ) + 1 ) ) ) {
    			$themeInstaller.find( '.next-theme' ).addClass( 'disabled' );
    		}
    	},
    
    	installTheme: function( event ) {
    		var _this = this;
    
    		event.preventDefault();
    
    		wp.updates.maybeRequestFilesystemCredentials( event );
    
    		$( document ).on( 'wp-theme-install-success', function( event, response ) {
    			if ( _this.model.get( 'id' ) === response.slug ) {
    				_this.model.set( { 'installed': true } );
    			}
    		} );
    
    		wp.updates.installTheme( {
    			slug: $( event.target ).data( 'slug' )
    		} );
    	},
    
    	updateTheme: function( event ) {
    		var _this = this;
    
    		if ( ! this.model.get( 'hasPackage' ) ) {
    			return;
    		}
    
    		event.preventDefault();
    
    		wp.updates.maybeRequestFilesystemCredentials( event );
    
    		$( document ).on( 'wp-theme-update-success', function( event, response ) {
    			_this.model.off( 'change', _this.render, _this );
    			if ( _this.model.get( 'id' ) === response.slug ) {
    				_this.model.set( {
    					hasUpdate: false,
    					version: response.newVersion
    				} );
    			}
    			_this.model.on( 'change', _this.render, _this );
    		} );
    
    		wp.updates.updateTheme( {
    			slug: $( event.target ).parents( 'div.theme' ).first().data( 'slug' )
    		} );
    	}
    });
    
    // Theme Details view
    // Set ups a modal overlay with the expanded theme data
    themes.view.Details = wp.Backbone.View.extend({
    
    	// Wrap theme data on a div.theme element
    	className: 'theme-overlay',
    
    	events: {
    		'click': 'collapse',
    		'click .delete-theme': 'deleteTheme',
    		'click .left': 'previousTheme',
    		'click .right': 'nextTheme',
    		'click #update-theme': 'updateTheme'
    	},
    
    	// The HTML template for the theme overlay
    	html: themes.template( 'theme-single' ),
    
    	render: function() {
    		var data = this.model.toJSON();
    		this.$el.html( this.html( data ) );
    		// Renders active theme styles
    		this.activeTheme();
    		// Set up navigation events
    		this.navigation();
    		// Checks screenshot size
    		this.screenshotCheck( this.$el );
    		// Contain "tabbing" inside the overlay
    		this.containFocus( this.$el );
    	},
    
    	// Adds a class to the currently active theme
    	// and to the overlay in detailed view mode
    	activeTheme: function() {
    		// Check the model has the active property
    		this.$el.toggleClass( 'active', this.model.get( 'active' ) );
    	},
    
    	// Set initial focus and constrain tabbing within the theme browser modal.
    	containFocus: function( $el ) {
    
    		// Set initial focus on the primary action control.
    		_.delay( function() {
    			$( '.theme-overlay' ).focus();
    		}, 100 );
    
    		// Constrain tabbing within the modal.
    		$el.on( 'keydown.wp-themes', function( event ) {
    			var $firstFocusable = $el.find( '.theme-header button:not(.disabled)' ).first(),
    				$lastFocusable = $el.find( '.theme-actions a:visible' ).last();
    
    			// Check for the Tab key.
    			if ( 9 === event.which ) {
    				if ( $firstFocusable[0] === event.target && event.shiftKey ) {
    					$lastFocusable.focus();
    					event.preventDefault();
    				} else if ( $lastFocusable[0] === event.target && ! event.shiftKey ) {
    					$firstFocusable.focus();
    					event.preventDefault();
    				}
    			}
    		});
    	},
    
    	// Single theme overlay screen
    	// It's shown when clicking a theme
    	collapse: function( event ) {
    		var self = this,
    			scroll;
    
    		event = event || window.event;
    
    		// Prevent collapsing detailed view when there is only one theme available
    		if ( themes.data.themes.length === 1 ) {
    			return;
    		}
    
    		// Detect if the click is inside the overlay
    		// and don't close it unless the target was
    		// the div.back button
    		if ( $( event.target ).is( '.theme-backdrop' ) || $( event.target ).is( '.close' ) || event.keyCode === 27 ) {
    
    			// Add a temporary closing class while overlay fades out
    			$( 'body' ).addClass( 'closing-overlay' );
    
    			// With a quick fade out animation
    			this.$el.fadeOut( 130, function() {
    				// Clicking outside the modal box closes the overlay
    				$( 'body' ).removeClass( 'closing-overlay' );
    				// Handle event cleanup
    				self.closeOverlay();
    
    				// Get scroll position to avoid jumping to the top
    				scroll = document.body.scrollTop;
    
    				// Clean the url structure
    				themes.router.navigate( themes.router.baseUrl( '' ) );
    
    				// Restore scroll position
    				document.body.scrollTop = scroll;
    
    				// Return focus to the theme div
    				if ( themes.focusedTheme ) {
    					themes.focusedTheme.focus();
    				}
    			});
    		}
    	},
    
    	// Handles .disabled classes for next/previous buttons
    	navigation: function() {
    
    		// Disable Left/Right when at the start or end of the collection
    		if ( this.model.cid === this.model.collection.at(0).cid ) {
    			this.$el.find( '.left' )
    				.addClass( 'disabled' )
    				.prop( 'disabled', true );
    		}
    		if ( this.model.cid === this.model.collection.at( this.model.collection.length - 1 ).cid ) {
    			this.$el.find( '.right' )
    				.addClass( 'disabled' )
    				.prop( 'disabled', true );
    		}
    	},
    
    	// Performs the actions to effectively close
    	// the theme details overlay
    	closeOverlay: function() {
    		$( 'body' ).removeClass( 'modal-open' );
    		this.remove();
    		this.unbind();
    		this.trigger( 'theme:collapse' );
    	},
    
    	updateTheme: function( event ) {
    		var _this = this;
    		event.preventDefault();
    
    		wp.updates.maybeRequestFilesystemCredentials( event );
    
    		$( document ).on( 'wp-theme-update-success', function( event, response ) {
    			if ( _this.model.get( 'id' ) === response.slug ) {
    				_this.model.set( {
    					hasUpdate: false,
    					version: response.newVersion
    				} );
    			}
    			_this.render();
    		} );
    
    		wp.updates.updateTheme( {
    			slug: $( event.target ).data( 'slug' )
    		} );
    	},
    
    	deleteTheme: function( event ) {
    		var _this = this,
    		    _collection = _this.model.collection,
    		    _themes = themes;
    		event.preventDefault();
    
    		// Confirmation dialog for deleting a theme.
    		if ( ! window.confirm( wp.themes.data.settings.confirmDelete ) ) {
    			return;
    		}
    
    		wp.updates.maybeRequestFilesystemCredentials( event );
    
    		$( document ).one( 'wp-theme-delete-success', function( event, response ) {
    			_this.$el.find( '.close' ).trigger( 'click' );
    			$( '[data-slug="' + response.slug + '"]' ).css( { backgroundColor:'#faafaa' } ).fadeOut( 350, function() {
    				$( this ).remove();
    				_themes.data.themes = _.without( _themes.data.themes, _.findWhere( _themes.data.themes, { id: response.slug } ) );
    
    				$( '.wp-filter-search' ).val( '' );
    				_collection.doSearch( '' );
    				_collection.remove( _this.model );
    				_collection.trigger( 'themes:update' );
    			} );
    		} );
    
    		wp.updates.deleteTheme( {
    			slug: this.model.get( 'id' )
    		} );
    	},
    
    	nextTheme: function() {
    		var self = this;
    		self.trigger( 'theme:next', self.model.cid );
    		return false;
    	},
    
    	previousTheme: function() {
    		var self = this;
    		self.trigger( 'theme:previous', self.model.cid );
    		return false;
    	},
    
    	// Checks if the theme screenshot is the old 300px width version
    	// and adds a corresponding class if it's true
    	screenshotCheck: function( el ) {
    		var screenshot, image;
    
    		screenshot = el.find( '.screenshot img' );
    		image = new Image();
    		image.src = screenshot.attr( 'src' );
    
    		// Width check
    		if ( image.width && image.width <= 300 ) {
    			el.addClass( 'small-screenshot' );
    		}
    	}
    });
    
    // Theme Preview view
    // Set ups a modal overlay with the expanded theme data
    themes.view.Preview = themes.view.Details.extend({
    
    	className: 'wp-full-overlay expanded',
    	el: '.theme-install-overlay',
    
    	events: {
    		'click .close-full-overlay': 'close',
    		'click .collapse-sidebar': 'collapse',
    		'click .devices button': 'previewDevice',
    		'click .previous-theme': 'previousTheme',
    		'click .next-theme': 'nextTheme',
    		'keyup': 'keyEvent',
    		'click .theme-install': 'installTheme'
    	},
    
    	// The HTML template for the theme preview
    	html: themes.template( 'theme-preview' ),
    
    	render: function() {
    		var self = this,
    			currentPreviewDevice,
    			data = this.model.toJSON(),
    			$body = $( document.body );
    
    		$body.attr( 'aria-busy', 'true' );
    
    		this.$el.removeClass( 'iframe-ready' ).html( this.html( data ) );
    
    		currentPreviewDevice = this.$el.data( 'current-preview-device' );
    		if ( currentPreviewDevice ) {
    			self.tooglePreviewDeviceButtons( currentPreviewDevice );
    		}
    
    		themes.router.navigate( themes.router.baseUrl( themes.router.themePath + this.model.get( 'id' ) ), { replace: false } );
    
    		this.$el.fadeIn( 200, function() {
    			$body.addClass( 'theme-installer-active full-overlay-active' );
    		});
    
    		this.$el.find( 'iframe' ).one( 'load', function() {
    			self.iframeLoaded();
    		});
    	},
    
    	iframeLoaded: function() {
    		this.$el.addClass( 'iframe-ready' );
    		$( document.body ).attr( 'aria-busy', 'false' );
    	},
    
    	close: function() {
    		this.$el.fadeOut( 200, function() {
    			$( 'body' ).removeClass( 'theme-installer-active full-overlay-active' );
    
    			// Return focus to the theme div
    			if ( themes.focusedTheme ) {
    				themes.focusedTheme.focus();
    			}
    		}).removeClass( 'iframe-ready' );
    
    		// Restore the previous browse tab if available.
    		if ( themes.router.selectedTab ) {
    			themes.router.navigate( themes.router.baseUrl( '?browse=' + themes.router.selectedTab ) );
    			themes.router.selectedTab = false;
    		} else {
    			themes.router.navigate( themes.router.baseUrl( '' ) );
    		}
    		this.trigger( 'preview:close' );
    		this.undelegateEvents();
    		this.unbind();
    		return false;
    	},
    
    	collapse: function( event ) {
    		var $button = $( event.currentTarget );
    		if ( 'true' === $button.attr( 'aria-expanded' ) ) {
    			$button.attr({ 'aria-expanded': 'false', 'aria-label': l10n.expandSidebar });
    		} else {
    			$button.attr({ 'aria-expanded': 'true', 'aria-label': l10n.collapseSidebar });
    		}
    
    		this.$el.toggleClass( 'collapsed' ).toggleClass( 'expanded' );
    		return false;
    	},
    
    	previewDevice: function( event ) {
    		var device = $( event.currentTarget ).data( 'device' );
    
    		this.$el
    			.removeClass( 'preview-desktop preview-tablet preview-mobile' )
    			.addClass( 'preview-' + device )
    			.data( 'current-preview-device', device );
    
    		this.tooglePreviewDeviceButtons( device );
    	},
    
    	tooglePreviewDeviceButtons: function( newDevice ) {
    		var $devices = $( '.wp-full-overlay-footer .devices' );
    
    		$devices.find( 'button' )
    			.removeClass( 'active' )
    			.attr( 'aria-pressed', false );
    
    		$devices.find( 'button.preview-' + newDevice )
    			.addClass( 'active' )
    			.attr( 'aria-pressed', true );
    	},
    
    	keyEvent: function( event ) {
    		// The escape key closes the preview
    		if ( event.keyCode === 27 ) {
    			this.undelegateEvents();
    			this.close();
    		}
    		// The right arrow key, next theme
    		if ( event.keyCode === 39 ) {
    			_.once( this.nextTheme() );
    		}
    
    		// The left arrow key, previous theme
    		if ( event.keyCode === 37 ) {
    			this.previousTheme();
    		}
    	},
    
    	installTheme: function( event ) {
    		var _this   = this,
    		    $target = $( event.target );
    		event.preventDefault();
    
    		if ( $target.hasClass( 'disabled' ) ) {
    			return;
    		}
    
    		wp.updates.maybeRequestFilesystemCredentials( event );
    
    		$( document ).on( 'wp-theme-install-success', function() {
    			_this.model.set( { 'installed': true } );
    		} );
    
    		wp.updates.installTheme( {
    			slug: $target.data( 'slug' )
    		} );
    	}
    });
    
    // Controls the rendering of div.themes,
    // a wrapper that will hold all the theme elements
    themes.view.Themes = wp.Backbone.View.extend({
    
    	className: 'themes wp-clearfix',
    	$overlay: $( 'div.theme-overlay' ),
    
    	// Number to keep track of scroll position
    	// while in theme-overlay mode
    	index: 0,
    
    	// The theme count element
    	count: $( '.wrap .theme-count' ),
    
    	// The live themes count
    	liveThemeCount: 0,
    
    	initialize: function( options ) {
    		var self = this;
    
    		// Set up parent
    		this.parent = options.parent;
    
    		// Set current view to [grid]
    		this.setView( 'grid' );
    
    		// Move the active theme to the beginning of the collection
    		self.currentTheme();
    
    		// When the collection is updated by user input...
    		this.listenTo( self.collection, 'themes:update', function() {
    			self.parent.page = 0;
    			self.currentTheme();
    			self.render( this );
    		} );
    
    		// Update theme count to full result set when available.
    		this.listenTo( self.collection, 'query:success', function( count ) {
    			if ( _.isNumber( count ) ) {
    				self.count.text( count );
    				self.announceSearchResults( count );
    			} else {
    				self.count.text( self.collection.length );
    				self.announceSearchResults( self.collection.length );
    			}
    		});
    
    		this.listenTo( self.collection, 'query:empty', function() {
    			$( 'body' ).addClass( 'no-results' );
    		});
    
    		this.listenTo( this.parent, 'theme:scroll', function() {
    			self.renderThemes( self.parent.page );
    		});
    
    		this.listenTo( this.parent, 'theme:close', function() {
    			if ( self.overlay ) {
    				self.overlay.closeOverlay();
    			}
    		} );
    
    		// Bind keyboard events.
    		$( 'body' ).on( 'keyup', function( event ) {
    			if ( ! self.overlay ) {
    				return;
    			}
    
    			// Bail if the filesystem credentials dialog is shown.
    			if ( $( '#request-filesystem-credentials-dialog' ).is( ':visible' ) ) {
    				return;
    			}
    
    			// Pressing the right arrow key fires a theme:next event
    			if ( event.keyCode === 39 ) {
    				self.overlay.nextTheme();
    			}
    
    			// Pressing the left arrow key fires a theme:previous event
    			if ( event.keyCode === 37 ) {
    				self.overlay.previousTheme();
    			}
    
    			// Pressing the escape key fires a theme:collapse event
    			if ( event.keyCode === 27 ) {
    				self.overlay.collapse( event );
    			}
    		});
    	},
    
    	// Manages rendering of theme pages
    	// and keeping theme count in sync
    	render: function() {
    		// Clear the DOM, please
    		this.$el.empty();
    
    		// If the user doesn't have switch capabilities
    		// or there is only one theme in the collection
    		// render the detailed view of the active theme
    		if ( themes.data.themes.length === 1 ) {
    
    			// Constructs the view
    			this.singleTheme = new themes.view.Details({
    				model: this.collection.models[0]
    			});
    
    			// Render and apply a 'single-theme' class to our container
    			this.singleTheme.render();
    			this.$el.addClass( 'single-theme' );
    			this.$el.append( this.singleTheme.el );
    		}
    
    		// Generate the themes
    		// Using page instance
    		// While checking the collection has items
    		if ( this.options.collection.size() > 0 ) {
    			this.renderThemes( this.parent.page );
    		}
    
    		// Display a live theme count for the collection
    		this.liveThemeCount = this.collection.count ? this.collection.count : this.collection.length;
    		this.count.text( this.liveThemeCount );
    
    		/*
    		 * In the theme installer the themes count is already announced
    		 * because `announceSearchResults` is called on `query:success`.
    		 */
    		if ( ! themes.isInstall ) {
    			this.announceSearchResults( this.liveThemeCount );
    		}
    	},
    
    	// Iterates through each instance of the collection
    	// and renders each theme module
    	renderThemes: function( page ) {
    		var self = this;
    
    		self.instance = self.collection.paginate( page );
    
    		// If we have no more themes bail
    		if ( self.instance.size() === 0 ) {
    			// Fire a no-more-themes event.
    			this.parent.trigger( 'theme:end' );
    			return;
    		}
    
    		// Make sure the add-new stays at the end
    		if ( ! themes.isInstall && page >= 1 ) {
    			$( '.add-new-theme' ).remove();
    		}
    
    		// Loop through the themes and setup each theme view
    		self.instance.each( function( theme ) {
    			self.theme = new themes.view.Theme({
    				model: theme,
    				parent: self
    			});
    
    			// Render the views...
    			self.theme.render();
    			// and append them to div.themes
    			self.$el.append( self.theme.el );
    
    			// Binds to theme:expand to show the modal box
    			// with the theme details
    			self.listenTo( self.theme, 'theme:expand', self.expand, self );
    		});
    
    		// 'Add new theme' element shown at the end of the grid
    		if ( ! themes.isInstall && themes.data.settings.canInstall ) {
    			this.$el.append( '<div class="theme add-new-theme"><a href="' + themes.data.settings.installURI + '"><div class="theme-screenshot"><span></span></div><h2 class="theme-name">' + l10n.addNew + '</h2></a></div>' );
    		}
    
    		this.parent.page++;
    	},
    
    	// Grabs current theme and puts it at the beginning of the collection
    	currentTheme: function() {
    		var self = this,
    			current;
    
    		current = self.collection.findWhere({ active: true });
    
    		// Move the active theme to the beginning of the collection
    		if ( current ) {
    			self.collection.remove( current );
    			self.collection.add( current, { at:0 } );
    		}
    	},
    
    	// Sets current view
    	setView: function( view ) {
    		return view;
    	},
    
    	// Renders the overlay with the ThemeDetails view
    	// Uses the current model data
    	expand: function( id ) {
    		var self = this, $card, $modal;
    
    		// Set the current theme model
    		this.model = self.collection.get( id );
    
    		// Trigger a route update for the current model
    		themes.router.navigate( themes.router.baseUrl( themes.router.themePath + this.model.id ) );
    
    		// Sets this.view to 'detail'
    		this.setView( 'detail' );
    		$( 'body' ).addClass( 'modal-open' );
    
    		// Set up the theme details view
    		this.overlay = new themes.view.Details({
    			model: self.model
    		});
    
    		this.overlay.render();
    
    		if ( this.model.get( 'hasUpdate' ) ) {
    			$card  = $( '[data-slug="' + this.model.id + '"]' );
    			$modal = $( this.overlay.el );
    
    			if ( $card.find( '.updating-message' ).length ) {
    				$modal.find( '.notice-warning h3' ).remove();
    				$modal.find( '.notice-warning' )
    					.removeClass( 'notice-large' )
    					.addClass( 'updating-message' )
    					.find( 'p' ).text( wp.updates.l10n.updating );
    			} else if ( $card.find( '.notice-error' ).length ) {
    				$modal.find( '.notice-warning' ).remove();
    			}
    		}
    
    		this.$overlay.html( this.overlay.el );
    
    		// Bind to theme:next and theme:previous
    		// triggered by the arrow keys
    		//
    		// Keep track of the current model so we
    		// can infer an index position
    		this.listenTo( this.overlay, 'theme:next', function() {
    			// Renders the next theme on the overlay
    			self.next( [ self.model.cid ] );
    
    		})
    		.listenTo( this.overlay, 'theme:previous', function() {
    			// Renders the previous theme on the overlay
    			self.previous( [ self.model.cid ] );
    		});
    	},
    
    	// This method renders the next theme on the overlay modal
    	// based on the current position in the collection
    	// @params [model cid]
    	next: function( args ) {
    		var self = this,
    			model, nextModel;
    
    		// Get the current theme
    		model = self.collection.get( args[0] );
    		// Find the next model within the collection
    		nextModel = self.collection.at( self.collection.indexOf( model ) + 1 );
    
    		// Sanity check which also serves as a boundary test
    		if ( nextModel !== undefined ) {
    
    			// We have a new theme...
    			// Close the overlay
    			this.overlay.closeOverlay();
    
    			// Trigger a route update for the current model
    			self.theme.trigger( 'theme:expand', nextModel.cid );
    
    		}
    	},
    
    	// This method renders the previous theme on the overlay modal
    	// based on the current position in the collection
    	// @params [model cid]
    	previous: function( args ) {
    		var self = this,
    			model, previousModel;
    
    		// Get the current theme
    		model = self.collection.get( args[0] );
    		// Find the previous model within the collection
    		previousModel = self.collection.at( self.collection.indexOf( model ) - 1 );
    
    		if ( previousModel !== undefined ) {
    
    			// We have a new theme...
    			// Close the overlay
    			this.overlay.closeOverlay();
    
    			// Trigger a route update for the current model
    			self.theme.trigger( 'theme:expand', previousModel.cid );
    
    		}
    	},
    
    	// Dispatch audible search results feedback message
    	announceSearchResults: function( count ) {
    		if ( 0 === count ) {
    			wp.a11y.speak( l10n.noThemesFound );
    		} else {
    			wp.a11y.speak( l10n.themesFound.replace( '%d', count ) );
    		}
    	}
    });
    
    // Search input view controller.
    themes.view.Search = wp.Backbone.View.extend({
    
    	tagName: 'input',
    	className: 'wp-filter-search',
    	id: 'wp-filter-search-input',
    	searching: false,
    
    	attributes: {
    		placeholder: l10n.searchPlaceholder,
    		type: 'search',
    		'aria-describedby': 'live-search-desc'
    	},
    
    	events: {
    		'input': 'search',
    		'keyup': 'search',
    		'blur': 'pushState'
    	},
    
    	initialize: function( options ) {
    
    		this.parent = options.parent;
    
    		this.listenTo( this.parent, 'theme:close', function() {
    			this.searching = false;
    		} );
    
    	},
    
    	search: function( event ) {
    		// Clear on escape.
    		if ( event.type === 'keyup' && event.which === 27 ) {
    			event.target.value = '';
    		}
    
    		// Since doSearch is debounced, it will only run when user input comes to a rest.
    		this.doSearch( event );
    	},
    
    	// Runs a search on the theme collection.
    	doSearch: function( event ) {
    		var options = {};
    
    		this.collection.doSearch( event.target.value.replace( /\+/g, ' ' ) );
    
    		// if search is initiated and key is not return
    		if ( this.searching && event.which !== 13 ) {
    			options.replace = true;
    		} else {
    			this.searching = true;
    		}
    
    		// Update the URL hash
    		if ( event.target.value ) {
    			themes.router.navigate( themes.router.baseUrl( themes.router.searchPath + event.target.value ), options );
    		} else {
    			themes.router.navigate( themes.router.baseUrl( '' ) );
    		}
    	},
    
    	pushState: function( event ) {
    		var url = themes.router.baseUrl( '' );
    
    		if ( event.target.value ) {
    			url = themes.router.baseUrl( themes.router.searchPath + encodeURIComponent( event.target.value ) );
    		}
    
    		this.searching = false;
    		themes.router.navigate( url );
    
    	}
    });
    
    /**
     * Navigate router.
     *
     * @since 4.9.0
     *
     * @param {string} url - URL to navigate to.
     * @param {object} state - State.
     * @returns {void}
     */
    function navigateRouter( url, state ) {
    	var router = this;
    	if ( Backbone.history._hasPushState ) {
    		Backbone.Router.prototype.navigate.call( router, url, state );
    	}
    }
    
    // Sets up the routes events for relevant url queries
    // Listens to [theme] and [search] params
    themes.Router = Backbone.Router.extend({
    
    	routes: {
    		'themes.php?theme=:slug': 'theme',
    		'themes.php?search=:query': 'search',
    		'themes.php?s=:query': 'search',
    		'themes.php': 'themes',
    		'': 'themes'
    	},
    
    	baseUrl: function( url ) {
    		return 'themes.php' + url;
    	},
    
    	themePath: '?theme=',
    	searchPath: '?search=',
    
    	search: function( query ) {
    		$( '.wp-filter-search' ).val( query.replace( /\+/g, ' ' ) );
    	},
    
    	themes: function() {
    		$( '.wp-filter-search' ).val( '' );
    	},
    
    	navigate: navigateRouter
    
    });
    
    // Execute and setup the application
    themes.Run = {
    	init: function() {
    		// Initializes the blog's theme library view
    		// Create a new collection with data
    		this.themes = new themes.Collection( themes.data.themes );
    
    		// Set up the view
    		this.view = new themes.view.Appearance({
    			collection: this.themes
    		});
    
    		this.render();
    
    		// Start debouncing user searches after Backbone.history.start().
    		this.view.searchView.doSearch = _.debounce( this.view.searchView.doSearch, 500 );
    	},
    
    	render: function() {
    
    		// Render results
    		this.view.render();
    		this.routes();
    
    		if ( Backbone.History.started ) {
    			Backbone.history.stop();
    		}
    		Backbone.history.start({
    			root: themes.data.settings.adminUrl,
    			pushState: true,
    			hashChange: false
    		});
    	},
    
    	routes: function() {
    		var self = this;
    		// Bind to our global thx object
    		// so that the object is available to sub-views
    		themes.router = new themes.Router();
    
    		// Handles theme details route event
    		themes.router.on( 'route:theme', function( slug ) {
    			self.view.view.expand( slug );
    		});
    
    		themes.router.on( 'route:themes', function() {
    			self.themes.doSearch( '' );
    			self.view.trigger( 'theme:close' );
    		});
    
    		// Handles search route event
    		themes.router.on( 'route:search', function() {
    			$( '.wp-filter-search' ).trigger( 'keyup' );
    		});
    
    		this.extraRoutes();
    	},
    
    	extraRoutes: function() {
    		return false;
    	}
    };
    
    // Extend the main Search view
    themes.view.InstallerSearch =  themes.view.Search.extend({
    
    	events: {
    		'input': 'search',
    		'keyup': 'search'
    	},
    
    	terms: '',
    
    	// Handles Ajax request for searching through themes in public repo
    	search: function( event ) {
    
    		// Tabbing or reverse tabbing into the search input shouldn't trigger a search
    		if ( event.type === 'keyup' && ( event.which === 9 || event.which === 16 ) ) {
    			return;
    		}
    
    		this.collection = this.options.parent.view.collection;
    
    		// Clear on escape.
    		if ( event.type === 'keyup' && event.which === 27 ) {
    			event.target.value = '';
    		}
    
    		this.doSearch( event.target.value );
    	},
    
    	doSearch: function( value ) {
    		var request = {};
    
    		// Don't do anything if the search terms haven't changed.
    		if ( this.terms === value ) {
    			return;
    		}
    
    		// Updates terms with the value passed.
    		this.terms = value;
    
    		request.search = value;
    
    		// Intercept an [author] search.
    		//
    		// If input value starts with `author:` send a request
    		// for `author` instead of a regular `search`
    		if ( value.substring( 0, 7 ) === 'author:' ) {
    			request.search = '';
    			request.author = value.slice( 7 );
    		}
    
    		// Intercept a [tag] search.
    		//
    		// If input value starts with `tag:` send a request
    		// for `tag` instead of a regular `search`
    		if ( value.substring( 0, 4 ) === 'tag:' ) {
    			request.search = '';
    			request.tag = [ value.slice( 4 ) ];
    		}
    
    		$( '.filter-links li > a.current' )
    			.removeClass( 'current' )
    			.removeAttr( 'aria-current' );
    
    		$( 'body' ).removeClass( 'show-filters filters-applied show-favorites-form' );
    		$( '.drawer-toggle' ).attr( 'aria-expanded', 'false' );
    
    		// Get the themes by sending Ajax POST request to api.wordpress.org/themes
    		// or searching the local cache
    		this.collection.query( request );
    
    		// Set route
    		themes.router.navigate( themes.router.baseUrl( themes.router.searchPath + encodeURIComponent( value ) ), { replace: true } );
    	}
    });
    
    themes.view.Installer = themes.view.Appearance.extend({
    
    	el: '#wpbody-content .wrap',
    
    	// Register events for sorting and filters in theme-navigation
    	events: {
    		'click .filter-links li > a': 'onSort',
    		'click .theme-filter': 'onFilter',
    		'click .drawer-toggle': 'moreFilters',
    		'click .filter-drawer .apply-filters': 'applyFilters',
    		'click .filter-group [type="checkbox"]': 'addFilter',
    		'click .filter-drawer .clear-filters': 'clearFilters',
    		'click .edit-filters': 'backToFilters',
    		'click .favorites-form-submit' : 'saveUsername',
    		'keyup #wporg-username-input': 'saveUsername'
    	},
    
    	// Initial render method
    	render: function() {
    		var self = this;
    
    		this.search();
    		this.uploader();
    
    		this.collection = new themes.Collection();
    
    		// Bump `collection.currentQuery.page` and request more themes if we hit the end of the page.
    		this.listenTo( this, 'theme:end', function() {
    
    			// Make sure we are not already loading
    			if ( self.collection.loadingThemes ) {
    				return;
    			}
    
    			// Set loadingThemes to true and bump page instance of currentQuery.
    			self.collection.loadingThemes = true;
    			self.collection.currentQuery.page++;
    
    			// Use currentQuery.page to build the themes request.
    			_.extend( self.collection.currentQuery.request, { page: self.collection.currentQuery.page } );
    			self.collection.query( self.collection.currentQuery.request );
    		});
    
    		this.listenTo( this.collection, 'query:success', function() {
    			$( 'body' ).removeClass( 'loading-content' );
    			$( '.theme-browser' ).find( 'div.error' ).remove();
    		});
    
    		this.listenTo( this.collection, 'query:fail', function() {
    			$( 'body' ).removeClass( 'loading-content' );
    			$( '.theme-browser' ).find( 'div.error' ).remove();
    			$( '.theme-browser' ).find( 'div.themes' ).before( '<div class="error"><p>' + l10n.error + '</p><p><button class="button try-again">' + l10n.tryAgain + '</button></p></div>' );
    			$( '.theme-browser .error .try-again' ).on( 'click', function( e ) {
    				e.preventDefault();
    				$( 'input.wp-filter-search' ).trigger( 'input' );
    			} );
    		});
    
    		if ( this.view ) {
    			this.view.remove();
    		}
    
    		// Set ups the view and passes the section argument
    		this.view = new themes.view.Themes({
    			collection: this.collection,
    			parent: this
    		});
    
    		// Reset pagination every time the install view handler is run
    		this.page = 0;
    
    		// Render and append
    		this.$el.find( '.themes' ).remove();
    		this.view.render();
    		this.$el.find( '.theme-browser' ).append( this.view.el ).addClass( 'rendered' );
    	},
    
    	// Handles all the rendering of the public theme directory
    	browse: function( section ) {
    		// Create a new collection with the proper theme data
    		// for each section
    		this.collection.query( { browse: section } );
    	},
    
    	// Sorting navigation
    	onSort: function( event ) {
    		var $el = $( event.target ),
    			sort = $el.data( 'sort' );
    
    		event.preventDefault();
    
    		$( 'body' ).removeClass( 'filters-applied show-filters' );
    		$( '.drawer-toggle' ).attr( 'aria-expanded', 'false' );
    
    		// Bail if this is already active
    		if ( $el.hasClass( this.activeClass ) ) {
    			return;
    		}
    
    		this.sort( sort );
    
    		// Trigger a router.naviagte update
    		themes.router.navigate( themes.router.baseUrl( themes.router.browsePath + sort ) );
    	},
    
    	sort: function( sort ) {
    		this.clearSearch();
    
    		// Track sorting so we can restore the correct tab when closing preview.
    		themes.router.selectedTab = sort;
    
    		$( '.filter-links li > a, .theme-filter' )
    			.removeClass( this.activeClass )
    			.removeAttr( 'aria-current' );
    
    		$( '[data-sort="' + sort + '"]' )
    			.addClass( this.activeClass )
    			.attr( 'aria-current', 'page' );
    
    		if ( 'favorites' === sort ) {
    			$( 'body' ).addClass( 'show-favorites-form' );
    		} else {
    			$( 'body' ).removeClass( 'show-favorites-form' );
    		}
    
    		this.browse( sort );
    	},
    
    	// Filters and Tags
    	onFilter: function( event ) {
    		var request,
    			$el = $( event.target ),
    			filter = $el.data( 'filter' );
    
    		// Bail if this is already active
    		if ( $el.hasClass( this.activeClass ) ) {
    			return;
    		}
    
    		$( '.filter-links li > a, .theme-section' )
    			.removeClass( this.activeClass )
    			.removeAttr( 'aria-current' );
    		$el
    			.addClass( this.activeClass )
    			.attr( 'aria-current', 'page' );
    
    		if ( ! filter ) {
    			return;
    		}
    
    		// Construct the filter request
    		// using the default values
    		filter = _.union( [ filter, this.filtersChecked() ] );
    		request = { tag: [ filter ] };
    
    		// Get the themes by sending Ajax POST request to api.wordpress.org/themes
    		// or searching the local cache
    		this.collection.query( request );
    	},
    
    	// Clicking on a checkbox to add another filter to the request
    	addFilter: function() {
    		this.filtersChecked();
    	},
    
    	// Applying filters triggers a tag request
    	applyFilters: function( event ) {
    		var name,
    			tags = this.filtersChecked(),
    			request = { tag: tags },
    			filteringBy = $( '.filtered-by .tags' );
    
    		if ( event ) {
    			event.preventDefault();
    		}
    
    		if ( ! tags ) {
    			wp.a11y.speak( l10n.selectFeatureFilter );
    			return;
    		}
    
    		$( 'body' ).addClass( 'filters-applied' );
    		$( '.filter-links li > a.current' )
    			.removeClass( 'current' )
    			.removeAttr( 'aria-current' );
    
    		filteringBy.empty();
    
    		_.each( tags, function( tag ) {
    			name = $( 'label[for="filter-id-' + tag + '"]' ).text();
    			filteringBy.append( '<span class="tag">' + name + '</span>' );
    		});
    
    		// Get the themes by sending Ajax POST request to api.wordpress.org/themes
    		// or searching the local cache
    		this.collection.query( request );
    	},
    
    	// Save the user's WordPress.org username and get his favorite themes.
    	saveUsername: function ( event ) {
    		var username = $( '#wporg-username-input' ).val(),
    			nonce = $( '#wporg-username-nonce' ).val(),
    			request = { browse: 'favorites', user: username },
    			that = this;
    
    		if ( event ) {
    			event.preventDefault();
    		}
    
    		// save username on enter
    		if ( event.type === 'keyup' && event.which !== 13 ) {
    			return;
    		}
    
    		return wp.ajax.send( 'save-wporg-username', {
    			data: {
    				_wpnonce: nonce,
    				username: username
    			},
    			success: function () {
    				// Get the themes by sending Ajax POST request to api.wordpress.org/themes
    				// or searching the local cache
    				that.collection.query( request );
    			}
    		} );
    	},
    
    	// Get the checked filters
    	// @return {array} of tags or false
    	filtersChecked: function() {
    		var items = $( '.filter-group' ).find( ':checkbox' ),
    			tags = [];
    
    		_.each( items.filter( ':checked' ), function( item ) {
    			tags.push( $( item ).prop( 'value' ) );
    		});
    
    		// When no filters are checked, restore initial state and return
    		if ( tags.length === 0 ) {
    			$( '.filter-drawer .apply-filters' ).find( 'span' ).text( '' );
    			$( '.filter-drawer .clear-filters' ).hide();
    			$( 'body' ).removeClass( 'filters-applied' );
    			return false;
    		}
    
    		$( '.filter-drawer .apply-filters' ).find( 'span' ).text( tags.length );
    		$( '.filter-drawer .clear-filters' ).css( 'display', 'inline-block' );
    
    		return tags;
    	},
    
    	activeClass: 'current',
    
    	/*
    	 * When users press the "Upload Theme" button, show the upload form in place.
    	 */
    	uploader: function() {
    		var uploadViewToggle = $( '.upload-view-toggle' ),
    			$body = $( document.body );
    
    		uploadViewToggle.on( 'click', function() {
    			// Toggle the upload view.
    			$body.toggleClass( 'show-upload-view' );
    			// Toggle the `aria-expanded` button attribute.
    			uploadViewToggle.attr( 'aria-expanded', $body.hasClass( 'show-upload-view' ) );
    		});
    	},
    
    	// Toggle the full filters navigation
    	moreFilters: function( event ) {
    		var $body = $( 'body' ),
    			$toggleButton = $( '.drawer-toggle' );
    
    		event.preventDefault();
    
    		if ( $body.hasClass( 'filters-applied' ) ) {
    			return this.backToFilters();
    		}
    
    		this.clearSearch();
    
    		themes.router.navigate( themes.router.baseUrl( '' ) );
    		// Toggle the feature filters view.
    		$body.toggleClass( 'show-filters' );
    		// Toggle the `aria-expanded` button attribute.
    		$toggleButton.attr( 'aria-expanded', $body.hasClass( 'show-filters' ) );
    	},
    
    	// Clears all the checked filters
    	// @uses filtersChecked()
    	clearFilters: function( event ) {
    		var items = $( '.filter-group' ).find( ':checkbox' ),
    			self = this;
    
    		event.preventDefault();
    
    		_.each( items.filter( ':checked' ), function( item ) {
    			$( item ).prop( 'checked', false );
    			return self.filtersChecked();
    		});
    	},
    
    	backToFilters: function( event ) {
    		if ( event ) {
    			event.preventDefault();
    		}
    
    		$( 'body' ).removeClass( 'filters-applied' );
    	},
    
    	clearSearch: function() {
    		$( '#wp-filter-search-input').val( '' );
    	}
    });
    
    themes.InstallerRouter = Backbone.Router.extend({
    	routes: {
    		'theme-install.php?theme=:slug': 'preview',
    		'theme-install.php?browse=:sort': 'sort',
    		'theme-install.php?search=:query': 'search',
    		'theme-install.php': 'sort'
    	},
    
    	baseUrl: function( url ) {
    		return 'theme-install.php' + url;
    	},
    
    	themePath: '?theme=',
    	browsePath: '?browse=',
    	searchPath: '?search=',
    
    	search: function( query ) {
    		$( '.wp-filter-search' ).val( query.replace( /\+/g, ' ' ) );
    	},
    
    	navigate: navigateRouter
    });
    
    
    themes.RunInstaller = {
    
    	init: function() {
    		// Set up the view
    		// Passes the default 'section' as an option
    		this.view = new themes.view.Installer({
    			section: 'featured',
    			SearchView: themes.view.InstallerSearch
    		});
    
    		// Render results
    		this.render();
    
    		// Start debouncing user searches after Backbone.history.start().
    		this.view.searchView.doSearch = _.debounce( this.view.searchView.doSearch, 500 );
    	},
    
    	render: function() {
    
    		// Render results
    		this.view.render();
    		this.routes();
    
    		if ( Backbone.History.started ) {
    			Backbone.history.stop();
    		}
    		Backbone.history.start({
    			root: themes.data.settings.adminUrl,
    			pushState: true,
    			hashChange: false
    		});
    	},
    
    	routes: function() {
    		var self = this,
    			request = {};
    
    		// Bind to our global `wp.themes` object
    		// so that the router is available to sub-views
    		themes.router = new themes.InstallerRouter();
    
    		// Handles `theme` route event
    		// Queries the API for the passed theme slug
    		themes.router.on( 'route:preview', function( slug ) {
    
    			// Remove existing handlers.
    			if ( themes.preview ) {
    				themes.preview.undelegateEvents();
    				themes.preview.unbind();
    			}
    
    			// If the theme preview is active, set the current theme.
    			if ( self.view.view.theme && self.view.view.theme.preview ) {
    				self.view.view.theme.model = self.view.collection.findWhere( { 'slug': slug } );
    				self.view.view.theme.preview();
    			} else {
    
    				// Select the theme by slug.
    				request.theme = slug;
    				self.view.collection.query( request );
    				self.view.collection.trigger( 'update' );
    
    				// Open the theme preview.
    				self.view.collection.once( 'query:success', function() {
    					$( 'div[data-slug="' + slug + '"]' ).trigger( 'click' );
    				});
    
    			}
    		});
    
    		// Handles sorting / browsing routes
    		// Also handles the root URL triggering a sort request
    		// for `featured`, the default view
    		themes.router.on( 'route:sort', function( sort ) {
    			if ( ! sort ) {
    				sort = 'featured';
    				themes.router.navigate( themes.router.baseUrl( '?browse=featured' ), { replace: true } );
    			}
    			self.view.sort( sort );
    
    			// Close the preview if open.
    			if ( themes.preview ) {
    				themes.preview.close();
    			}
    		});
    
    		// The `search` route event. The router populates the input field.
    		themes.router.on( 'route:search', function() {
    			$( '.wp-filter-search' ).focus().trigger( 'keyup' );
    		});
    
    		this.extraRoutes();
    	},
    
    	extraRoutes: function() {
    		return false;
    	}
    };
    
    // Ready...
    $( document ).ready(function() {
    	if ( themes.isInstall ) {
    		themes.RunInstaller.init();
    	} else {
    		themes.Run.init();
    	}
    
    	// Update the return param just in time.
    	$( document.body ).on( 'click', '.load-customize', function() {
    		var link = $( this ), urlParser = document.createElement( 'a' );
    		urlParser.href = link.prop( 'href' );
    		urlParser.search = $.param( _.extend(
    			wp.customize.utils.parseQueryString( urlParser.search.substr( 1 ) ),
    			{
    				'return': window.location.href
    			}
    		) );
    		link.prop( 'href', urlParser.href );
    	});
    
    	$( '.broken-themes .delete-theme' ).on( 'click', function() {
    		return confirm( _wpThemeSettings.settings.confirmDelete );
    	});
    });
    
    })( jQuery );
    
    // Align theme browser thickbox
    var tb_position;
    jQuery(document).ready( function($) {
    	tb_position = function() {
    		var tbWindow = $('#TB_window'),
    			width = $(window).width(),
    			H = $(window).height(),
    			W = ( 1040 < width ) ? 1040 : width,
    			adminbar_height = 0;
    
    		if ( $('#wpadminbar').length ) {
    			adminbar_height = parseInt( $('#wpadminbar').css('height'), 10 );
    		}
    
    		if ( tbWindow.size() ) {
    			tbWindow.width( W - 50 ).height( H - 45 - adminbar_height );
    			$('#TB_iframeContent').width( W - 50 ).height( H - 75 - adminbar_height );
    			tbWindow.css({'margin-left': '-' + parseInt( ( ( W - 50 ) / 2 ), 10 ) + 'px'});
    			if ( typeof document.body.style.maxWidth !== 'undefined' ) {
    				tbWindow.css({'top': 20 + adminbar_height + 'px', 'margin-top': '0'});
    			}
    		}
    	};
    
    	$(window).resize(function(){ tb_position(); });
    });