@ng-bootstrap/ng-bootstrap
Version:
Angular powered Bootstrap
76 lines • 11.3 kB
JavaScript
import { isString } from '../util/util';
export function toFragmentElement(container, id) {
if (!container || id == null) {
return null;
}
return isString(id) ? container.querySelector(`#${CSS.escape(id)}`) : id;
}
function getOrderedFragments(container, fragments) {
const selector = [...fragments].map(({ id }) => `#${CSS.escape(id)}`).join(',');
return Array.from(container.querySelectorAll(selector));
}
export const defaultProcessChanges = (state, changeActive, ctx) => {
const { rootElement, fragments, scrollSpy, options, entries } = state;
const orderedFragments = getOrderedFragments(rootElement, fragments);
if (!ctx.initialized) {
ctx.initialized = true;
ctx.gapFragment = null;
ctx.visibleFragments = new Set();
// special case when one of the fragments was pre-selected
const preSelectedFragment = toFragmentElement(rootElement, options?.initialFragment);
if (preSelectedFragment) {
scrollSpy.scrollTo(preSelectedFragment);
return;
}
}
for (const entry of entries) {
const { isIntersecting, target: fragment } = entry;
// 1. an entry became visible
if (isIntersecting) {
// if we were in-between two elements, we have to clear it up
if (ctx.gapFragment) {
ctx.visibleFragments.delete(ctx.gapFragment);
ctx.gapFragment = null;
}
ctx.visibleFragments.add(fragment);
}
// 2. an entry became invisible
else {
ctx.visibleFragments.delete(fragment);
// nothing is visible anymore, but something just was actually
if (ctx.visibleFragments.size === 0 && scrollSpy.active !== '') {
// 2.1 scrolling down - keeping the same element
if (entry.boundingClientRect.top < entry.rootBounds.top) {
ctx.gapFragment = fragment;
ctx.visibleFragments.add(ctx.gapFragment);
}
// 2.2 scrolling up - getting the previous element
else {
// scrolling up and no more fragments above
if (fragment === orderedFragments[0]) {
ctx.gapFragment = null;
ctx.visibleFragments.clear();
changeActive('');
return;
}
// getting previous fragment
else {
const fragmentIndex = orderedFragments.indexOf(fragment);
ctx.gapFragment = orderedFragments[fragmentIndex - 1] || null;
if (ctx.gapFragment) {
ctx.visibleFragments.add(ctx.gapFragment);
}
}
}
}
}
}
// getting the first visible element in the DOM order of the fragments
for (const fragment of orderedFragments) {
if (ctx.visibleFragments.has(fragment)) {
changeActive(fragment.id);
break;
}
}
};
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container.querySelector(`#${CSS.escape(id)}`) : id;\n}\n\nfunction getOrderedFragments(container: Element, fragments: Set<Element>): Element[] {\n\tconst selector = [...fragments].map(({ id }) => `#${CSS.escape(id)}`).join(',');\n\treturn Array.from(container.querySelectorAll(selector));\n}\n\nexport const defaultProcessChanges: NgbScrollSpyProcessChanges = (\n\tstate: {\n\t\tentries: IntersectionObserverEntry[];\n\t\trootElement: HTMLElement;\n\t\tfragments: Set<Element>;\n\t\tscrollSpy: NgbScrollSpyService;\n\t\toptions: NgbScrollSpyOptions;\n\t},\n\tchangeActive: (active: string) => void,\n\tctx: {\n\t\tinitialized: boolean;\n\t\tgapFragment: Element | null;\n\t\tvisibleFragments: Set<Element>;\n\t},\n) => {\n\tconst { rootElement, fragments, scrollSpy, options, entries } = state;\n\tconst orderedFragments = getOrderedFragments(rootElement, fragments);\n\n\tif (!ctx.initialized) {\n\t\tctx.initialized = true;\n\t\tctx.gapFragment = null;\n\t\tctx.visibleFragments = new Set<Element>();\n\n\t\t// special case when one of the fragments was pre-selected\n\t\tconst preSelectedFragment = toFragmentElement(rootElement, options?.initialFragment);\n\t\tif (preSelectedFragment) {\n\t\t\tscrollSpy.scrollTo(preSelectedFragment);\n\t\t\treturn;\n\t\t}\n\t}\n\n\tfor (const entry of entries) {\n\t\tconst { isIntersecting, target: fragment } = entry;\n\n\t\t// 1. an entry became visible\n\t\tif (isIntersecting) {\n\t\t\t// if we were in-between two elements, we have to clear it up\n\t\t\tif (ctx.gapFragment) {\n\t\t\t\tctx.visibleFragments.delete(ctx.gapFragment);\n\t\t\t\tctx.gapFragment = null;\n\t\t\t}\n\n\t\t\tctx.visibleFragments.add(fragment);\n\t\t}\n\n\t\t// 2. an entry became invisible\n\t\telse {\n\t\t\tctx.visibleFragments.delete(fragment);\n\n\t\t\t// nothing is visible anymore, but something just was actually\n\t\t\tif (ctx.visibleFragments.size === 0 && scrollSpy.active !== '') {\n\t\t\t\t// 2.1 scrolling down - keeping the same element\n\t\t\t\tif (entry.boundingClientRect.top < entry.rootBounds!.top) {\n\t\t\t\t\tctx.gapFragment = fragment;\n\t\t\t\t\tctx.visibleFragments.add(ctx.gapFragment);\n\t\t\t\t}\n\t\t\t\t// 2.2 scrolling up - getting the previous element\n\t\t\t\telse {\n\t\t\t\t\t// scrolling up and no more fragments above\n\t\t\t\t\tif (fragment === orderedFragments[0]) {\n\t\t\t\t\t\tctx.gapFragment = null;\n\t\t\t\t\t\tctx.visibleFragments.clear();\n\t\t\t\t\t\tchangeActive('');\n\t\t\t\t\t\treturn;\n\t\t\t\t\t}\n\n\t\t\t\t\t// getting previous fragment\n\t\t\t\t\telse {\n\t\t\t\t\t\tconst fragmentIndex = orderedFragments.indexOf(fragment);\n\t\t\t\t\t\tctx.gapFragment = orderedFragments[fragmentIndex - 1] || null;\n\t\t\t\t\t\tif (ctx.gapFragment) {\n\t\t\t\t\t\t\tctx.visibleFragments.add(ctx.gapFragment);\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t// getting the first visible element in the DOM order of the fragments\n\tfor (const fragment of orderedFragments) {\n\t\tif (ctx.visibleFragments.has(fragment)) {\n\t\t\tchangeActive(fragment.id);\n\t\t\tbreak;\n\t\t}\n\t}\n};\n"]}