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/*!
* Show gallery captions when focused. Copied directly from jquery.mw-jump.js.
* Also Dynamically resize images to justify them.
*/
( function ( $ ) {
$( function () {
var isTouchScreen,
gettingFocus,
galleries = 'ul.mw-gallery-packed-overlay, ul.mw-gallery-packed-hover, ul.mw-gallery-packed';
// Is there a better way to detect a touchscreen? Current check taken from stack overflow.
isTouchScreen = !!( window.ontouchstart !== undefined || window.DocumentTouch !== undefined && document instanceof window.DocumentTouch );
if ( isTouchScreen ) {
// Always show the caption for a touch screen.
$( 'ul.mw-gallery-packed-hover' )
.addClass( 'mw-gallery-packed-overlay' )
.removeClass( 'mw-gallery-packed-hover' );
} else {
// Note use of just "a", not a.image, since we want this to trigger if a link in
// the caption receives focus
$( 'ul.mw-gallery-packed-hover li.gallerybox' ).on( 'focus blur', 'a', function ( e ) {
// Confusingly jQuery leaves e.type as focusout for delegated blur events
gettingFocus = e.type !== 'blur' && e.type !== 'focusout';
$( this ).closest( 'li.gallerybox' ).toggleClass( 'mw-gallery-focused', gettingFocus );
} );
}
// Now on to justification.
// We may still get ragged edges if someone resizes their window. Could bind to
// that event, otoh do we really want to constantly be resizing galleries?
$( galleries ).each( function () {
var lastTop,
$img,
imgWidth,
imgHeight,
rows = [],
$gallery = $( this );
$gallery.children( 'li' ).each( function () {
// Math.floor to be paranoid if things are off by 0.00000000001
var top = Math.floor( $( this ).position().top ),
$this = $( this );
if ( top !== lastTop ) {
rows[rows.length] = [];
lastTop = top;
}
$img = $this.find( 'div.thumb a.image img' );
if ( $img.length && $img[0].height ) {
imgHeight = $img[0].height;
imgWidth = $img[0].width;
} else {
// If we don't have a real image, get the containing divs width/height.
// Note that if we do have a real image, using this method will generally
// give the same answer, but can be different in the case of a very
// narrow image where extra padding is added.
imgHeight = $this.children().children( 'div:first' ).height();
imgWidth = $this.children().children( 'div:first' ).width();
}
// Hack to make an edge case work ok
if ( imgHeight < 30 ) {
// Don't try and resize this item.
imgHeight = 0;
}
rows[rows.length - 1][rows[rows.length - 1].length] = {
$elm: $this,
width: $this.outerWidth(),
imgWidth: imgWidth,
// XXX: can divide by 0 ever happen?
aspect: imgWidth / imgHeight,
captionWidth: $this.children().children( 'div.gallerytextwrapper' ).width(),
height: imgHeight
};
} );
( function () {
var maxWidth,
combinedAspect,
combinedPadding,
curRow,
curRowHeight,
wantedWidth,
preferredHeight,
newWidth,
padding,
$outerDiv,
$innerDiv,
$imageDiv,
$imageElm,
imageElm,
$caption,
i,
j,
avgZoom,
totalZoom = 0;
for ( i = 0; i < rows.length; i++ ) {
maxWidth = $gallery.width();
combinedAspect = 0;
combinedPadding = 0;
curRow = rows[i];
curRowHeight = 0;
for ( j = 0; j < curRow.length; j++ ) {
if ( curRowHeight === 0 ) {
if ( isFinite( curRow[j].height ) ) {
// Get the height of this row, by taking the first
// non-out of bounds height
curRowHeight = curRow[j].height;
}
}
if ( curRow[j].aspect === 0 || !isFinite( curRow[j].aspect ) ) {
// One of the dimensions are 0. Probably should
// not try to resize.
combinedPadding += curRow[j].width;
} else {
combinedAspect += curRow[j].aspect;
combinedPadding += curRow[j].width - curRow[j].imgWidth;
}
}
// Add some padding for inter-element spacing.
combinedPadding += 5 * curRow.length;
wantedWidth = maxWidth - combinedPadding;
preferredHeight = wantedWidth / combinedAspect;
if ( preferredHeight > curRowHeight * 1.5 ) {
// Only expand at most 1.5 times current size
// As that's as high a resolution as we have.
// Also on the off chance there is a bug in this
// code, would prevent accidentally expanding to
// be 10 billion pixels wide.
if ( i === rows.length - 1 ) {
// If its the last row, and we can't fit it,
// don't make the entire row huge.
avgZoom = ( totalZoom / ( rows.length - 1 ) ) * curRowHeight;
if ( isFinite( avgZoom ) && avgZoom >= 1 && avgZoom <= 1.5 ) {
preferredHeight = avgZoom;
} else {
// Probably a single row gallery
preferredHeight = curRowHeight;
}
} else {
preferredHeight = 1.5 * curRowHeight;
}
}
if ( !isFinite( preferredHeight ) ) {
// This *definitely* should not happen.
// Skip this row.
continue;
}
if ( preferredHeight < 5 ) {
// Well something clearly went wrong...
// Skip this row.
continue;
}
if ( preferredHeight / curRowHeight > 1 ) {
totalZoom += preferredHeight / curRowHeight;
} else {
// If we shrink, still consider that a zoom of 1
totalZoom += 1;
}
for ( j = 0; j < curRow.length; j++ ) {
newWidth = preferredHeight * curRow[j].aspect;
padding = curRow[j].width - curRow[j].imgWidth;
$outerDiv = curRow[j].$elm;
$innerDiv = $outerDiv.children( 'div' ).first();
$imageDiv = $innerDiv.children( 'div.thumb' );
$imageElm = $imageDiv.find( 'img' ).first();
imageElm = $imageElm.length ? $imageElm[0] : null;
$caption = $outerDiv.find( 'div.gallerytextwrapper' );
// Since we are going to re-adjust the height, the vertical
// centering margins need to be reset.
$imageDiv.children( 'div' ).css( 'margin', '0px auto' );
if ( newWidth < 60 || !isFinite( newWidth ) ) {
// Making something skinnier than this will mess up captions,
if ( newWidth < 1 || !isFinite( newWidth ) ) {
$innerDiv.height( preferredHeight );
// Don't even try and touch the image size if it could mean
// making it disappear.
continue;
}
} else {
$outerDiv.width( newWidth + padding );
$innerDiv.width( newWidth + padding );
$imageDiv.width( newWidth );
$caption.width( curRow[j].captionWidth + ( newWidth - curRow[j].imgWidth ) );
}
if ( imageElm ) {
// We don't always have an img, e.g. in the case of an invalid file.
imageElm.width = newWidth;
imageElm.height = preferredHeight;
} else {
// Not a file box.
$imageDiv.height( preferredHeight );
}
}
}
}() );
} );
} );
}( jQuery ) );
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