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/**
* Builds a generic structure that looks like:
*
* <div class="scroller"> // 100x200 viewport
* <div class="contents"> // 100x500
* <div class="prepadding"></div> // 100x100
* <div class="container"> // 300x300 containing block
* <div class="filler"></div> // 100x100
* <div class="sticky box"></div> // 100x100
* </div>
* </div>
* </div>
*
* If 'inline' is true, the necessary blocks will be marked as inline-block,
* and the dimensions above are flipped.
*
* Returns an 'elements' object which has each of the above elements as an
* accessible property.
*/
function setupStickyTest(stickyDirection, stickyOffset, inline = false) {
const elements = {};
elements.scroller = document.createElement('div');
elements.scroller.style.position = 'relative';
elements.scroller.style.width = (inline ? '200px' : '100px');
elements.scroller.style.height = (inline ? '100px' : '200px');
elements.scroller.style.overflow = 'scroll';
elements.contents = document.createElement('div');
elements.contents.style.height = (inline ? '100%' : '500px');
elements.contents.style.width = (inline ? '500px' : '100%');
elements.prepadding = document.createElement('div');
elements.prepadding.style.height = (inline ? '100%' : '100px');
elements.prepadding.style.width = (inline ? '100px' : '100%');
if (inline)
elements.prepadding.style.display = 'inline-block';
elements.container = document.createElement('div');
elements.container.style.height = (inline ? '100%' : '300px');
elements.container.style.width = (inline ? '300px' : '100%');
if (inline)
elements.container.style.display = 'inline-block';
elements.filler = document.createElement('div');
elements.filler.style.height = (inline ? '100%' : '100px');
elements.filler.style.width = (inline ? '100px' : '100%');
if (inline)
elements.filler.style.display = 'inline-block';
elements.sticky = document.createElement('div');
elements.sticky.style = `${stickyDirection}: ${stickyOffset}px;`;
elements.sticky.style.position = 'sticky';
elements.sticky.style.height = (inline ? '100%' : '100px');
elements.sticky.style.width = (inline ? '100px' : '100%');
elements.sticky.style.backgroundColor = 'green';
if (inline)
elements.sticky.style.display = 'inline-block';
elements.scroller.appendChild(elements.contents);
elements.contents.appendChild(elements.prepadding);
elements.contents.appendChild(elements.container);
elements.container.appendChild(elements.filler);
elements.container.appendChild(elements.sticky);
document.body.appendChild(elements.scroller);
return elements;
}
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