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Rework image grid into a horizontal masonry

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- The new server-based horizontal masonry enables tightly packed image grids even with images of varying aspect ratios
- Additionally, the space an image takes is now allocated before it's loaded, reducing content shifting
This commit is contained in:
Hypolite Petovan 2023-09-23 15:56:49 -04:00
parent fc5e60e97b
commit 3cc469c0b7
4 changed files with 77 additions and 34 deletions
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60
src/Model/Item.php
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@ -3268,25 +3268,64 @@ class Item
}
/**
* Creates a horizontally masoned gallery with a fixed maximum number of pictures per row.
*
* For each row, we calculate how much of the total width each picture will take depending on their aspect ratio
* and how much relative height it needs to accomodate all pictures next to each other with their height normalized.
*
* @param array $images
* @return string
* @throws \Friendica\Network\HTTPException\ServiceUnavailableException
*/
private static function makeImageGrid(array $images): string
{
// Image for first column (fc) and second column (sc)
$images_fc = [];
$images_sc = [];
static $column_size = 2;
for ($i = 0; $i < count($images); $i++) {
($i % 2 == 0) ? ($images_fc[] = $images[$i]) : ($images_sc[] = $images[$i]);
}
$rows = array_map(
function (array $row_images) {
if ($singleImageInRow = count($row_images) == 1) {
$row_images[] = $row_images[0];
}
$widths = [];
$heights = [];
foreach ($row_images as $image) {
$widths[] = $image['attachment']['width'];
$heights[] = $image['attachment']['height'];
}
$maxHeight = max($heights);
// Corrected height preserving aspect ratio when all images on a row are
$correctedWidths = [];
foreach ($widths as $i => $width) {
$correctedWidths[] = $width * $maxHeight / $heights[$i];
}
$totalWidth = array_sum($correctedWidths);
foreach ($row_images as $i => $image) {
$row_images[$i]['gridWidth'] = $correctedWidths[$i];
$row_images[$i]['gridHeight'] = $maxHeight;
$row_images[$i]['heightRatio'] = 100 * $maxHeight / $correctedWidths[$i];
// Ratio of the width of the image relative to the total width of the images on the row
$row_images[$i]['widthRatio'] = 100 * $correctedWidths[$i] / $totalWidth;
// This magic value will stay constant for each image of any given row and
// is ultimately used to determine the height of the row container
$row_images[$i]['commonHeightRatio'] = 100 * $correctedWidths[$i] / $totalWidth / ($widths[$i] / $heights[$i]);
}
if ($singleImageInRow) {
unset($row_images[1]);
}
return $row_images;
},
array_chunk($images, $column_size)
);
return Renderer::replaceMacros(Renderer::getMarkupTemplate('content/image_grid.tpl'), [
'columns' => [
'fc' => $images_fc,
'sc' => $images_sc,
],
'rows' => $rows,
]);
}
@ -3464,6 +3503,7 @@ class Item
if (self::containsLink($item['body'], $src_url)) {
continue;
}
$images[] = ['src' => $src_url, 'preview' => $preview_url, 'attachment' => $attachment, 'uri_id' => $item['uri-id']];
}
}