diff options
Diffstat (limited to 'plugins/jetpack/extensions/blocks/tiled-gallery/deprecated/v1/layout/mosaic/resize.js')
-rw-r--r-- | plugins/jetpack/extensions/blocks/tiled-gallery/deprecated/v1/layout/mosaic/resize.js | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/plugins/jetpack/extensions/blocks/tiled-gallery/deprecated/v1/layout/mosaic/resize.js b/plugins/jetpack/extensions/blocks/tiled-gallery/deprecated/v1/layout/mosaic/resize.js new file mode 100644 index 00000000..022729c8 --- /dev/null +++ b/plugins/jetpack/extensions/blocks/tiled-gallery/deprecated/v1/layout/mosaic/resize.js @@ -0,0 +1,107 @@ +/** + * Internal dependencies + */ +import { GUTTER_WIDTH } from '../../constants'; + +/** + * Distribute a difference across ns so that their sum matches the target + * + * @param {Array<number>} parts Array of numbers to fit + * @param {number} target Number that sum should match + * @return {Array<number>} Adjusted parts + */ +function adjustFit( parts, target ) { + const diff = target - parts.reduce( ( sum, n ) => sum + n, 0 ); + const partialDiff = diff / parts.length; + return parts.map( p => p + partialDiff ); +} + +export function handleRowResize( row, width ) { + applyRowRatio( row, getRowRatio( row ), width ); +} + +function getRowRatio( row ) { + const result = getRowCols( row ) + .map( getColumnRatio ) + .reduce( + ( [ ratioA, weightedRatioA ], [ ratioB, weightedRatioB ] ) => { + return [ ratioA + ratioB, weightedRatioA + weightedRatioB ]; + }, + [ 0, 0 ] + ); + return result; +} + +export function getGalleryRows( gallery ) { + return Array.from( gallery.querySelectorAll( '.tiled-gallery__row' ) ); +} + +function getRowCols( row ) { + return Array.from( row.querySelectorAll( '.tiled-gallery__col' ) ); +} + +function getColImgs( col ) { + return Array.from( + col.querySelectorAll( '.tiled-gallery__item > img, .tiled-gallery__item > a > img' ) + ); +} + +function getColumnRatio( col ) { + const imgs = getColImgs( col ); + const imgCount = imgs.length; + const ratio = + 1 / + imgs.map( getImageRatio ).reduce( ( partialColRatio, imgRatio ) => { + return partialColRatio + 1 / imgRatio; + }, 0 ); + const result = [ ratio, ratio * imgCount || 1 ]; + return result; +} + +function getImageRatio( img ) { + const w = parseInt( img.dataset.width, 10 ); + const h = parseInt( img.dataset.height, 10 ); + const result = w && ! Number.isNaN( w ) && h && ! Number.isNaN( h ) ? w / h : 1; + return result; +} + +function applyRowRatio( row, [ ratio, weightedRatio ], width ) { + const rawHeight = + ( 1 / ratio ) * ( width - GUTTER_WIDTH * ( row.childElementCount - 1 ) - weightedRatio ); + + applyColRatio( row, { + rawHeight, + rowWidth: width - GUTTER_WIDTH * ( row.childElementCount - 1 ), + } ); +} + +function applyColRatio( row, { rawHeight, rowWidth } ) { + const cols = getRowCols( row ); + + const colWidths = cols.map( + col => ( rawHeight - GUTTER_WIDTH * ( col.childElementCount - 1 ) ) * getColumnRatio( col )[ 0 ] + ); + + const adjustedWidths = adjustFit( colWidths, rowWidth ); + + cols.forEach( ( col, i ) => { + const rawWidth = colWidths[ i ]; + const width = adjustedWidths[ i ]; + applyImgRatio( col, { + colHeight: rawHeight - GUTTER_WIDTH * ( col.childElementCount - 1 ), + width, + rawWidth, + } ); + } ); +} + +function applyImgRatio( col, { colHeight, width, rawWidth } ) { + const imgHeights = getColImgs( col ).map( img => rawWidth / getImageRatio( img ) ); + const adjustedHeights = adjustFit( imgHeights, colHeight ); + + // Set size of col children, not the <img /> element + Array.from( col.children ).forEach( ( item, i ) => { + const height = adjustedHeights[ i ]; + item.setAttribute( 'style', `height:${ height }px;width:${ width }px;` ); + } ); +} |