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naively supporting cqw and cqh #11

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naively supporting cqw and cqh #11

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54 changes: 44 additions & 10 deletions dist/index.cjs
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Original file line number Diff line number Diff line change
Expand Up @@ -89,30 +89,36 @@ function debounce (fn, interval) {
* parses offsetString of the format calc(<length> + <length>)
* @param {string|undefined} offsetString
* @param {AbsoluteOffsetContext} absoluteOffsetContext
* @param {HTMLElement} container
*/
function parseOffsetCalc(offsetString, absoluteOffsetContext) {
const match = offsetString.match(/^calc\s*\(\s*(-?\d+((px)|(vh)|(vw)))\s*\+\s*(-?\d+((px)|(vh)|(vw)))\s*\)\s*$/);
return transformAbsoluteOffsetToNumber(match[1], absoluteOffsetContext) + transformAbsoluteOffsetToNumber(match[6], absoluteOffsetContext);
function parseOffsetCalc(offsetString, absoluteOffsetContext, container) {
const match = offsetString.match(/^calc\s*\(\s*(-?\d+((px)|(vh)|(vw)|(cqh)|(cqw)))\s*\+\s*(-?\d+((px)|(vh)|(vw)|(cqh)|(cqw)))\s*\)\s*$/);
return transformAbsoluteOffsetToNumber(match[1], absoluteOffsetContext, container) + transformAbsoluteOffsetToNumber(match[8], absoluteOffsetContext, container);
}

/**
* Convert an absolute offset as string to number of pixels
*
* @param {string|undefined} offsetString
* @param {AbsoluteOffsetContext} absoluteOffsetContext
* @param {HTMLElement} container
* @return {number}
*/
function transformAbsoluteOffsetToNumber (offsetString, absoluteOffsetContext) {
function transformAbsoluteOffsetToNumber (offsetString, absoluteOffsetContext, container) {
return offsetString
? /^-?\d+px$/.test(offsetString)
? parseInt(offsetString)
: /^-?\d+vh$/.test(offsetString)
? parseInt(offsetString) * absoluteOffsetContext.viewportHeight / 100
: /^-?\d+vw$/.test(offsetString)
? parseInt(offsetString) * absoluteOffsetContext.viewportWidth / 100
: /^calc\s*\(\s*-?\d+((px)|(vh)|(vw))\s*\+\s*-?\d+((px)|(vh)|(vw))\s*\)\s*$/.test(offsetString)
? parseOffsetCalc(offsetString, absoluteOffsetContext)
: parseInt(offsetString) || 0
: /^-?\d+cqh$/.test(offsetString)
? parseInt(offsetString) * container.offsetHeight / 100
: /^-?\d+cqw$/.test(offsetString)
? parseInt(offsetString) * container.offsetWidth / 100
: /^calc\s*\(\s*-?\d+((px)|(vh)|(vw)|(cqh)|(cqw))\s*\+\s*-?\d+((px)|(vh)|(vw)|(cqh)|(cqw))\s*\)\s*$/.test(offsetString)
? parseOffsetCalc(offsetString, absoluteOffsetContext, container)
: parseInt(offsetString) || 0
: 0;
}

Expand Down Expand Up @@ -246,10 +252,11 @@ function computeStickinessIntoFullRange(offsetTree, absoluteStartOffset, absolut
* @param {number} viewportSize
* @param {boolean} isHorizontal
* @param {AbsoluteOffsetContext} absoluteOffsetContext
* @param {HTMLElement} container
* @param {Array<{element: HTMLElement, offset: number, sticky: {start?: number, end?: number}}>} offsetTree
* @return {ScrollScene}
*/
function transformSceneRangesToOffsets (scene, rect, viewportSize, isHorizontal, absoluteOffsetContext, offsetTree) {
function transformSceneRangesToOffsets (scene, rect, viewportSize, isHorizontal, absoluteOffsetContext, container, offsetTree) {
const { start, end, duration } = scene;

let startOffset = start;
Expand All @@ -275,7 +282,7 @@ function transformSceneRangesToOffsets (scene, rect, viewportSize, isHorizontal,
if (startRange || start?.name) {
startRange = startRange || start;

const startAdd = transformAbsoluteOffsetToNumber(startRange.add, absoluteOffsetContext);
const startAdd = transformAbsoluteOffsetToNumber(startRange.add, absoluteOffsetContext, container);
const absoluteStartOffset = transformRangeToPosition({...startRange, offset: 0}, viewportSize, rect);
const absoluteEndOffset = transformRangeToPosition({...startRange, offset: 100}, viewportSize, rect);
// we take 0% to 100% of the named range for start, and we compute the position by adding the sticky addition for the given start offset
Expand All @@ -287,7 +294,7 @@ function transformSceneRangesToOffsets (scene, rect, viewportSize, isHorizontal,
if (endRange || end?.name) {
endRange = endRange || end;

const endAdd = transformAbsoluteOffsetToNumber(endRange.add, absoluteOffsetContext);
const endAdd = transformAbsoluteOffsetToNumber(endRange.add, absoluteOffsetContext, container);
const absoluteStartOffset = transformRangeToPosition({...endRange, offset: 0}, viewportSize, rect);
const absoluteEndOffset = transformRangeToPosition({...endRange, offset: 100}, viewportSize, rect);
// we take 0% to 100% of the named range for end, and we compute the position by adding the sticky addition for the given end offset
Expand All @@ -303,6 +310,16 @@ function transformSceneRangesToOffsets (scene, rect, viewportSize, isHorizontal,
return {...scene, start: startOffset, end: endOffset, startRange, endRange, duration: overrideDuration || duration };
}

/**
* Check whether the position of an element is sticky.
*
* @param {CSSStyleDeclaration} style
* @return {boolean}
*/
function getIsContainer (style) {
return style.containerType ? style.containerType !== 'normal' : false;
}

/**
* Check whether the position of an element is sticky.
*
Expand Down Expand Up @@ -396,6 +413,8 @@ function getTransformedScene (scene, root, viewportSize, isHorizontal, absoluteO
const elementStickiness = isElementSticky ? getStickyData(elementStyle, isHorizontal) : undefined;

let parent = element.offsetParent;
let foundContainer = getIsContainer(elementStyle);
let container = foundContainer ? element : null;
let elementLayoutStart = 0;
let isFixed = elementStyle.position === 'fixed';
const elementOffset = getRectStart(element, isHorizontal, isElementSticky);
Expand All @@ -418,11 +437,16 @@ function getTransformedScene (scene, root, viewportSize, isHorizontal, absoluteO
if (parent === root) {
offsetTree.push({element: parent, offset: 0});
// if we're at the root don't add its own offset
if (!foundContainer) {
container = parent;
foundContainer = true;
}
break;
}

const nodeStyle = window.getComputedStyle(parent);
const isSticky = getIsSticky(nodeStyle);
const isContainer = getIsContainer(nodeStyle);
const sticky = isSticky ? getStickyData(nodeStyle, isHorizontal) : undefined;

// get the base offset of the source element - before adding sticky intervals
Expand All @@ -433,10 +457,19 @@ function getTransformedScene (scene, root, viewportSize, isHorizontal, absoluteO
elementLayoutStart += offset;
}

if (!foundContainer && isContainer) {
container = parent;
foundContainer = true;
}

offsetTree.push({element: parent, offset, sticky});
parent = parent.offsetParent;

if (!parent) {
if (!foundContainer) {
container = element;
foundContainer = true;
}
// only if offsetParent is null do we know that the fixed element is actually fixed to the viewport and we need to set duration to 0
isFixed = nodeStyle.position === 'fixed';
}
Expand All @@ -450,6 +483,7 @@ function getTransformedScene (scene, root, viewportSize, isHorizontal, absoluteO
viewportSize,
isHorizontal,
absoluteOffsetContext,
container,
offsetTree
);

Expand Down
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