| blob | 1892967a338ffe69355059735e865ae73c444478 |
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';
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 );
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 }
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 );
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 );
45 if ( top !== lastTop ) {
46 rows[rows.length] = [];
47 lastTop = top;
48 }
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 }
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 }
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 } );
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;
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;
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 }
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 }
127 // Add some padding for inter-element spacing.
128 combinedPadding += 5 * curRow.length;
129 wantedWidth = maxWidth - combinedPadding;
130 preferredHeight = wantedWidth / combinedAspect;
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 }
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 }
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' );
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' );
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 }
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 ) );