resources/src/mediawiki.page/mediawiki.page.gallery.js

   1 /*!
   2  * Show gallery captions when focused. Copied directly from jquery.mw-jump.js.
   3  * Also Dynamically resize images to justify them.
   4  */
   5 ( function ( $ ) {
   6         $( function () {
   7                 var isTouchScreen,
   8                         gettingFocus,
   9                         galleries = 'ul.mw-gallery-packed-overlay, ul.mw-gallery-packed-hover, ul.mw-gallery-packed';
  10
  11                 // Is there a better way to detect a touchscreen? Current check taken from stack overflow.
  12                 isTouchScreen = !!( window.ontouchstart !== undefined || window.DocumentTouch !== undefined && document instanceof window.DocumentTouch );
  13
  14                 if ( isTouchScreen ) {
  15                         // Always show the caption for a touch screen.
  16                         $( 'ul.mw-gallery-packed-hover' )
  17                                 .addClass( 'mw-gallery-packed-overlay' )
  18                                 .removeClass( 'mw-gallery-packed-hover' );
  19                 } else {
  20                         // Note use of just "a", not a.image, since we want this to trigger if a link in
  21                         // the caption receives focus
  22                         $( 'ul.mw-gallery-packed-hover li.gallerybox' ).on( 'focus blur', 'a', function ( e ) {
  23                                 // Confusingly jQuery leaves e.type as focusout for delegated blur events
  24                                 gettingFocus = e.type !== 'blur' && e.type !== 'focusout';
  25                                 $( this ).closest( 'li.gallerybox' ).toggleClass( 'mw-gallery-focused', gettingFocus );
  26                         } );
  27                 }
  28
  29                 // Now on to justification.
  30                 // We may still get ragged edges if someone resizes their window. Could bind to
  31                 // that event, otoh do we really want to constantly be resizing galleries?
  32                 $( galleries ).each( function () {
  33                         var lastTop,
  34                                 $img,
  35                                 imgWidth,
  36                                 imgHeight,
  37                                 rows = [],
  38                                 $gallery = $( this );
  39
  40                         $gallery.children( 'li' ).each( function () {
  41                                 // Math.floor to be paranoid if things are off by 0.00000000001
  42                                 var top = Math.floor( $( this ).position().top ),
  43                                         $this = $( this );
  44
  45                                 if ( top !== lastTop ) {
  46                                         rows[rows.length] = [];
  47                                         lastTop = top;
  48                                 }
  49
  50                                 $img = $this.find( 'div.thumb a.image img' );
  51                                 if ( $img.length && $img[0].height ) {
  52                                         imgHeight = $img[0].height;
  53                                         imgWidth = $img[0].width;
  54                                 } else {
  55                                         // If we don't have a real image, get the containing divs width/height.
  56                                         // Note that if we do have a real image, using this method will generally
  57                                         // give the same answer, but can be different in the case of a very
  58                                         // narrow image where extra padding is added.
  59                                         imgHeight = $this.children().children( 'div:first' ).height();
  60                                         imgWidth = $this.children().children( 'div:first' ).width();
  61                                 }
  62
  63                                 // Hack to make an edge case work ok
  64                                 if ( imgHeight < 30 ) {
  65                                         // Don't try and resize this item.
  66                                         imgHeight = 0;
  67                                 }
  68
  69                                 rows[rows.length - 1][rows[rows.length - 1].length] = {
  70                                         $elm: $this,
  71                                         width: $this.outerWidth(),
  72                                         imgWidth: imgWidth,
  73                                         // XXX: can divide by 0 ever happen?
  74                                         aspect: imgWidth / imgHeight,
  75                                         captionWidth: $this.children().children( 'div.gallerytextwrapper' ).width(),
  76                                         height: imgHeight
  77                                 };
  78                         } );
  79
  80                         ( function () {
  81                                 var maxWidth,
  82                                         combinedAspect,
  83                                         combinedPadding,
  84                                         curRow,
  85                                         curRowHeight,
  86                                         wantedWidth,
  87                                         preferredHeight,
  88                                         newWidth,
  89                                         padding,
  90                                         $outerDiv,
  91                                         $innerDiv,
  92                                         $imageDiv,
  93                                         $imageElm,
  94                                         imageElm,
  95                                         $caption,
  96                                         i,
  97                                         j,
  98                                         avgZoom,
  99                                         totalZoom = 0;
 100
 101                                 for ( i = 0; i < rows.length; i++ ) {
 102                                         maxWidth = $gallery.width();
 103                                         combinedAspect = 0;
 104                                         combinedPadding = 0;
 105                                         curRow = rows[i];
 106                                         curRowHeight = 0;
 107
 108                                         for ( j = 0; j < curRow.length; j++ ) {
 109                                                 if ( curRowHeight === 0 ) {
 110                                                         if ( isFinite( curRow[j].height ) ) {
 111                                                                 // Get the height of this row, by taking the first
 112                                                                 // non-out of bounds height
 113                                                                 curRowHeight = curRow[j].height;
 114                                                         }
 115                                                 }
 116
 117                                                 if ( curRow[j].aspect === 0 || !isFinite( curRow[j].aspect ) ) {
 118                                                         // One of the dimensions are 0. Probably should
 119                                                         // not try to resize.
 120                                                         combinedPadding += curRow[j].width;
 121                                                 } else {
 122                                                         combinedAspect += curRow[j].aspect;
 123                                                         combinedPadding += curRow[j].width - curRow[j].imgWidth;
 124                                                 }
 125                                         }
 126
 127                                         // Add some padding for inter-element spacing.
 128                                         combinedPadding += 5 * curRow.length;
 129                                         wantedWidth = maxWidth - combinedPadding;
 130                                         preferredHeight = wantedWidth / combinedAspect;
 131
 132                                         if ( preferredHeight > curRowHeight * 1.5 ) {
 133                                                 // Only expand at most 1.5 times current size
 134                                                 // As that's as high a resolution as we have.
 135                                                 // Also on the off chance there is a bug in this
 136                                                 // code, would prevent accidentally expanding to
 137                                                 // be 10 billion pixels wide.
 138                                                 if ( i === rows.length - 1 ) {
 139                                                         // If its the last row, and we can't fit it,
 140                                                         // don't make the entire row huge.
 141                                                         avgZoom = ( totalZoom / ( rows.length - 1 ) ) * curRowHeight;
 142                                                         if ( isFinite( avgZoom ) && avgZoom >= 1 && avgZoom <= 1.5 ) {
 143                                                                 preferredHeight = avgZoom;
 144                                                         } else {
 145                                                                 // Probably a single row gallery
 146                                                                 preferredHeight = curRowHeight;
 147                                                         }
 148                                                 } else {
 149                                                         preferredHeight = 1.5 * curRowHeight;
 150                                                 }
 151                                         }
 152                                         if ( !isFinite( preferredHeight ) ) {
 153                                                 // This *definitely* should not happen.
 154                                                 // Skip this row.
 155                                                 continue;
 156                                         }
 157                                         if ( preferredHeight < 5 ) {
 158                                                 // Well something clearly went wrong...
 159                                                 // Skip this row.
 160                                                 continue;
 161                                         }
 162
 163                                         if ( preferredHeight / curRowHeight > 1 ) {
 164                                                 totalZoom += preferredHeight / curRowHeight;
 165                                         } else {
 166                                                 // If we shrink, still consider that a zoom of 1
 167                                                 totalZoom += 1;
 168                                         }
 169
 170                                         for ( j = 0; j < curRow.length; j++ ) {
 171                                                 newWidth = preferredHeight * curRow[j].aspect;
 172                                                 padding = curRow[j].width - curRow[j].imgWidth;
 173                                                 $outerDiv = curRow[j].$elm;
 174                                                 $innerDiv = $outerDiv.children( 'div' ).first();
 175                                                 $imageDiv = $innerDiv.children( 'div.thumb' );
 176                                                 $imageElm = $imageDiv.find( 'img' ).first();
 177                                                 imageElm = $imageElm.length ? $imageElm[0] : null;
 178                                                 $caption = $outerDiv.find( 'div.gallerytextwrapper' );
 179
 180                                                 // Since we are going to re-adjust the height, the vertical
 181                                                 // centering margins need to be reset.
 182                                                 $imageDiv.children( 'div' ).css( 'margin', '0px auto' );
 183
 184                                                 if ( newWidth < 60 || !isFinite( newWidth ) ) {
 185                                                         // Making something skinnier than this will mess up captions,
 186                                                         if ( newWidth < 1 || !isFinite( newWidth ) ) {
 187                                                                 $innerDiv.height( preferredHeight );
 188                                                                 // Don't even try and touch the image size if it could mean
 189                                                                 // making it disappear.
 190                                                                 continue;
 191                                                         }
 192                                                 } else {
 193                                                         $outerDiv.width( newWidth + padding );
 194                                                         $innerDiv.width( newWidth + padding );
 195                                                         $imageDiv.width( newWidth );
 196                                                         $caption.width( curRow[j].captionWidth + ( newWidth - curRow[j].imgWidth ) );
 197                                                 }
 198
 199                                                 if ( imageElm ) {
 200                                                         // We don't always have an img, e.g. in the case of an invalid file.
 201                                                         imageElm.width = newWidth;
 202                                                         imageElm.height = preferredHeight;
 203                                                 } else {
 204                                                         // Not a file box.
 205                                                         $imageDiv.height( preferredHeight );
 206                                                 }
 207                                         }
 208                                 }
 209                         }() );
 210                 } );
 211         } );
 212 }( jQuery ) );