resources/src/mediawiki.widgets/MediaSearch/mw.widgets.MediaSearchWidget.js

   1 /*!
   2  * MediaWiki Widgets - MediaSearchWidget class.
   3  *
   4  * @copyright 2011-2016 VisualEditor Team and others; see AUTHORS.txt
   5  * @license The MIT License (MIT); see LICENSE.txt
   6  */
   7 ( function ( $, mw ) {
   8
   9         /**
  10          * Creates an mw.widgets.MediaSearchWidget object.
  11          *
  12          * @class
  13          * @extends OO.ui.SearchWidget
  14          *
  15          * @constructor
  16          * @param {Object} [config] Configuration options
  17          * @param {number} [size] Vertical size of thumbnails
  18          */
  19         mw.widgets.MediaSearchWidget = function MwWidgetsMediaSearchWidget( config ) {
  20                 // Configuration initialization
  21                 config = $.extend( {
  22                         placeholder: mw.msg( 'mw-widgets-mediasearch-input-placeholder' )
  23                 }, config );
  24
  25                 // Parent constructor
  26                 mw.widgets.MediaSearchWidget.super.call( this, config );
  27
  28                 // Properties
  29                 this.providers = {};
  30                 this.lastQueryValue = '';
  31                 this.searchQueue = new mw.widgets.MediaSearchQueue( {
  32                         limit: this.constructor.static.limit,
  33                         threshold: this.constructor.static.threshold
  34                 } );
  35
  36                 this.queryTimeout = null;
  37                 this.itemCache = {};
  38                 this.promises = [];
  39                 this.lang = config.lang || 'en';
  40                 this.$panels = config.$panels;
  41
  42                 this.externalLinkUrlProtocolsRegExp = new RegExp(
  43                         '^(' + mw.config.get( 'wgUrlProtocols' ) + ')',
  44                         'i'
  45                 );
  46
  47                 // Masonry fit properties
  48                 this.rows = [];
  49                 this.rowHeight = config.rowHeight || 200;
  50                 this.layoutQueue = [];
  51                 this.numItems = 0;
  52                 this.currentItemCache = [];
  53
  54                 this.resultsSize = {};
  55
  56                 this.selected = null;
  57
  58                 this.noItemsMessage = new OO.ui.LabelWidget( {
  59                         label: mw.msg( 'mw-widgets-mediasearch-noresults' ),
  60                         classes: [ 'mw-widget-mediaSearchWidget-noresults' ]
  61                 } );
  62                 this.noItemsMessage.toggle( false );
  63
  64                 // Events
  65                 this.$results.on( 'scroll', this.onResultsScroll.bind( this ) );
  66                 this.$query.append( this.noItemsMessage.$element );
  67                 this.results.connect( this, {
  68                         add: 'onResultsAdd',
  69                         remove: 'onResultsRemove'
  70                 } );
  71
  72                 this.resizeHandler = OO.ui.debounce( this.afterResultsResize.bind( this ), 500 );
  73
  74                 // Initialization
  75                 this.$element.addClass( 'mw-widget-mediaSearchWidget' );
  76         };
  77
  78         /* Inheritance */
  79
  80         OO.inheritClass( mw.widgets.MediaSearchWidget, OO.ui.SearchWidget );
  81
  82         /* Static properties */
  83
  84         mw.widgets.MediaSearchWidget.static.limit = 10;
  85
  86         mw.widgets.MediaSearchWidget.static.threshold = 5;
  87
  88         /* Methods */
  89
  90         /**
  91          * Respond to window resize and check if the result display should
  92          * be updated.
  93          */
  94         mw.widgets.MediaSearchWidget.prototype.afterResultsResize = function () {
  95                 var items = this.currentItemCache;
  96
  97                 if (
  98                         items.length > 0 &&
  99                         (
 100                                 this.resultsSize.width !== this.$results.width() ||
 101                                 this.resultsSize.height !== this.$results.height()
 102                         )
 103                 ) {
 104                         this.resetRows();
 105                         this.itemCache = {};
 106                         this.processQueueResults( items );
 107                         if ( this.results.getItems().length > 0 ) {
 108                                 this.lazyLoadResults();
 109                         }
 110
 111                         // Cache the size
 112                         this.resultsSize = {
 113                                 width: this.$results.width(),
 114                                 height: this.$results.height()
 115                         };
 116                 }
 117         };
 118
 119         /**
 120          * Teardown the widget; disconnect the window resize event.
 121          */
 122         mw.widgets.MediaSearchWidget.prototype.teardown = function () {
 123                 $( window ).off( 'resize', this.resizeHandler );
 124         };
 125
 126         /**
 127          * Setup the widget; activate the resize event.
 128          */
 129         mw.widgets.MediaSearchWidget.prototype.setup = function () {
 130                 $( window ).on( 'resize', this.resizeHandler );
 131         };
 132
 133         /**
 134          * Query all sources for media.
 135          *
 136          * @method
 137          */
 138         mw.widgets.MediaSearchWidget.prototype.queryMediaQueue = function () {
 139                 var search = this,
 140                         value = this.getQueryValue();
 141
 142                 if ( value === '' ) {
 143                         return;
 144                 }
 145
 146                 this.query.pushPending();
 147                 search.noItemsMessage.toggle( false );
 148
 149                 this.searchQueue.setSearchQuery( value );
 150                 this.searchQueue.get( this.constructor.static.limit )
 151                         .then( function ( items ) {
 152                                 if ( items.length > 0 ) {
 153                                         search.processQueueResults( items );
 154                                         search.currentItemCache = search.currentItemCache.concat( items );
 155                                 }
 156
 157                                 search.query.popPending();
 158                                 search.noItemsMessage.toggle( search.results.getItems().length === 0 );
 159                                 if ( search.results.getItems().length > 0 ) {
 160                                         search.lazyLoadResults();
 161                                 }
 162
 163                         } );
 164         };
 165
 166         /**
 167          * Process the media queue giving more items
 168          *
 169          * @method
 170          * @param {Object[]} items Given items by the media queue
 171          */
 172         mw.widgets.MediaSearchWidget.prototype.processQueueResults = function ( items ) {
 173                 var i, len, title,
 174                         resultWidgets = [],
 175                         inputSearchQuery = this.getQueryValue(),
 176                         queueSearchQuery = this.searchQueue.getSearchQuery();
 177
 178                 if ( inputSearchQuery === '' || queueSearchQuery !== inputSearchQuery ) {
 179                         return;
 180                 }
 181
 182                 for ( i = 0, len = items.length; i < len; i++ ) {
 183                         title = new mw.Title( items[ i ].title ).getMainText();
 184                         // Do not insert duplicates
 185                         if ( !Object.prototype.hasOwnProperty.call( this.itemCache, title ) ) {
 186                                 this.itemCache[ title ] = true;
 187                                 resultWidgets.push(
 188                                         new mw.widgets.MediaResultWidget( {
 189                                                 data: items[ i ],
 190                                                 rowHeight: this.rowHeight,
 191                                                 maxWidth: this.results.$element.width() / 3,
 192                                                 minWidth: 30,
 193                                                 rowWidth: this.results.$element.width()
 194                                         } )
 195                                 );
 196                         }
 197                 }
 198                 this.results.addItems( resultWidgets );
 199
 200         };
 201
 202         /**
 203          * Get the sanitized query value from the input
 204          *
 205          * @return {string} Query value
 206          */
 207         mw.widgets.MediaSearchWidget.prototype.getQueryValue = function () {
 208                 var queryValue = this.query.getValue().trim();
 209
 210                 if ( queryValue.match( this.externalLinkUrlProtocolsRegExp ) ) {
 211                         queryValue = queryValue.match( /.+\/([^\/]+)/ )[ 1 ];
 212                 }
 213                 return queryValue;
 214         };
 215
 216         /**
 217          * Handle search value change
 218          *
 219          * @param {string} value New value
 220          */
 221         mw.widgets.MediaSearchWidget.prototype.onQueryChange = function () {
 222                 // Get the sanitized query value
 223                 var queryValue = this.getQueryValue();
 224
 225                 if ( queryValue === this.lastQueryValue ) {
 226                         return;
 227                 }
 228
 229                 // Parent method
 230                 mw.widgets.MediaSearchWidget.super.prototype.onQueryChange.apply( this, arguments );
 231
 232                 // Reset
 233                 this.itemCache = {};
 234                 this.currentItemCache = [];
 235                 this.resetRows();
 236
 237                 // Empty the results queue
 238                 this.layoutQueue = [];
 239
 240                 // Change resource queue query
 241                 this.searchQueue.setSearchQuery( queryValue );
 242                 this.lastQueryValue = queryValue;
 243
 244                 // Queue
 245                 clearTimeout( this.queryTimeout );
 246                 this.queryTimeout = setTimeout( this.queryMediaQueue.bind( this ), 350 );
 247         };
 248
 249         /**
 250          * Handle results scroll events.
 251          *
 252          * @param {jQuery.Event} e Scroll event
 253          */
 254         mw.widgets.MediaSearchWidget.prototype.onResultsScroll = function () {
 255                 var position = this.$results.scrollTop() + this.$results.outerHeight(),
 256                         threshold = this.results.$element.outerHeight() - this.rowHeight * 3;
 257
 258                 // Check if we need to ask for more results
 259                 if ( !this.query.isPending() && position > threshold ) {
 260                         this.queryMediaQueue();
 261                 }
 262
 263                 this.lazyLoadResults();
 264         };
 265
 266         /**
 267          * Lazy-load the images that are visible.
 268          */
 269         mw.widgets.MediaSearchWidget.prototype.lazyLoadResults = function () {
 270                 var i, elementTop,
 271                         items = this.results.getItems(),
 272                         resultsScrollTop = this.$results.scrollTop(),
 273                         position = resultsScrollTop + this.$results.outerHeight();
 274
 275                 // Lazy-load results
 276                 for ( i = 0; i < items.length; i++ ) {
 277                         elementTop = items[ i ].$element.position().top;
 278                         if ( elementTop <= position && !items[ i ].hasSrc() ) {
 279                                 // Load the image
 280                                 items[ i ].lazyLoad();
 281                         }
 282                 }
 283         };
 284
 285         /**
 286          * Reset all the rows; destroy the jQuery elements and reset
 287          * the rows array.
 288          */
 289         mw.widgets.MediaSearchWidget.prototype.resetRows = function () {
 290                 var i, len;
 291
 292                 for ( i = 0, len = this.rows.length; i < len; i++ ) {
 293                         this.rows[ i ].$element.remove();
 294                 }
 295
 296                 this.rows = [];
 297                 this.itemCache = {};
 298         };
 299
 300         /**
 301          * Find an available row at the end. Either we will need to create a new
 302          * row or use the last available row if it isn't full.
 303          *
 304          * @return {number} Row index
 305          */
 306         mw.widgets.MediaSearchWidget.prototype.getAvailableRow = function () {
 307                 var row;
 308
 309                 if ( this.rows.length === 0 ) {
 310                         row = 0;
 311                 } else {
 312                         row = this.rows.length - 1;
 313                 }
 314
 315                 if ( !this.rows[ row ] ) {
 316                         // Create new row
 317                         this.rows[ row ] = {
 318                                 isFull: false,
 319                                 width: 0,
 320                                 items: [],
 321                                 $element: $( '<div>' )
 322                                         .addClass( 'mw-widget-mediaResultWidget-row' )
 323                                         .css( {
 324                                                 overflow: 'hidden'
 325                                         } )
 326                                         .data( 'row', row )
 327                                         .attr( 'data-full', false )
 328                         };
 329                         // Append to results
 330                         this.results.$element.append( this.rows[ row ].$element );
 331                 } else if ( this.rows[ row ].isFull ) {
 332                         row++;
 333                         // Create new row
 334                         this.rows[ row ] = {
 335                                 isFull: false,
 336                                 width: 0,
 337                                 items: [],
 338                                 $element: $( '<div>' )
 339                                         .addClass( 'mw-widget-mediaResultWidget-row' )
 340                                         .css( {
 341                                                 overflow: 'hidden'
 342                                         } )
 343                                         .data( 'row', row )
 344                                         .attr( 'data-full', false )
 345                         };
 346                         // Append to results
 347                         this.results.$element.append( this.rows[ row ].$element );
 348                 }
 349
 350                 return row;
 351         };
 352
 353         /**
 354          * Respond to add results event in the results widget.
 355          * Override the way SelectWidget and GroupElement append the items
 356          * into the group so we can append them in groups of rows.
 357          *
 358          * @param {mw.widgets.MediaResultWidget[]} items An array of item elements
 359          */
 360         mw.widgets.MediaSearchWidget.prototype.onResultsAdd = function ( items ) {
 361                 var search = this;
 362
 363                 // Add method to a queue; this queue will only run when the widget
 364                 // is visible
 365                 this.layoutQueue.push( function () {
 366                         var i, j, ilen, jlen, itemWidth, row, effectiveWidth,
 367                                 resizeFactor,
 368                                 maxRowWidth = search.results.$element.width() - 15;
 369
 370                         // Go over the added items
 371                         row = search.getAvailableRow();
 372                         for ( i = 0, ilen = items.length; i < ilen; i++ ) {
 373                                 itemWidth = items[ i ].$element.outerWidth( true );
 374
 375                                 // Add items to row until it is full
 376                                 if ( search.rows[ row ].width + itemWidth >= maxRowWidth ) {
 377                                         // Mark this row as full
 378                                         search.rows[ row ].isFull = true;
 379                                         search.rows[ row ].$element.attr( 'data-full', true );
 380
 381                                         // Find the resize factor
 382                                         effectiveWidth = search.rows[ row ].width;
 383                                         resizeFactor = maxRowWidth / effectiveWidth;
 384
 385                                         search.rows[ row ].$element.attr( 'data-effectiveWidth', effectiveWidth );
 386                                         search.rows[ row ].$element.attr( 'data-resizeFactor', resizeFactor );
 387                                         search.rows[ row ].$element.attr( 'data-row', row );
 388
 389                                         // Resize all images in the row to fit the width
 390                                         for ( j = 0, jlen = search.rows[ row ].items.length; j < jlen; j++ ) {
 391                                                 search.rows[ row ].items[ j ].resizeThumb( resizeFactor );
 392                                         }
 393
 394                                         // find another row
 395                                         row = search.getAvailableRow();
 396                                 }
 397
 398                                 // Add the cumulative
 399                                 search.rows[ row ].width += itemWidth;
 400
 401                                 // Store reference to the item and to the row
 402                                 search.rows[ row ].items.push( items[ i ] );
 403                                 items[ i ].setRow( row );
 404
 405                                 // Append the item
 406                                 search.rows[ row ].$element.append( items[ i ].$element );
 407                         }
 408
 409                         // If we have less than 4 rows, call for more images
 410                         if ( search.rows.length < 4 ) {
 411                                 search.queryMediaQueue();
 412                         }
 413                 } );
 414                 this.runLayoutQueue();
 415         };
 416
 417         /**
 418          * Run layout methods from the queue only if the element is visible.
 419          */
 420         mw.widgets.MediaSearchWidget.prototype.runLayoutQueue = function () {
 421                 var i, len;
 422
 423                 if ( this.$element.is( ':visible' ) ) {
 424                         for ( i = 0, len = this.layoutQueue.length; i < len; i++ ) {
 425                                 this.layoutQueue.pop()();
 426                         }
 427                 }
 428         };
 429
 430         /**
 431          * Respond to removing results event in the results widget.
 432          * Clear the relevant rows.
 433          *
 434          * @param {OO.ui.OptionWidget[]} items Removed items
 435          */
 436         mw.widgets.MediaSearchWidget.prototype.onResultsRemove = function ( items ) {
 437                 if ( items.length > 0 ) {
 438                         // In the case of the media search widget, if any items are removed
 439                         // all are removed (new search)
 440                         this.resetRows();
 441                         this.currentItemCache = [];
 442                 }
 443         };
 444
 445         /**
 446          * Set language for the search results.
 447          *
 448          * @param {string} lang Language
 449          */
 450         mw.widgets.MediaSearchWidget.prototype.setLang = function ( lang ) {
 451                 this.lang = lang;
 452         };
 453
 454         /**
 455          * Get language for the search results.
 456          *
 457          * @return {string} lang Language
 458          */
 459         mw.widgets.MediaSearchWidget.prototype.getLang = function () {
 460                 return this.lang;
 461         };
 462 }( jQuery, mediaWiki ) );