gnezim
52 lines
2.0 KiB
JavaScript
52 lines
2.0 KiB
JavaScript
import { correctNodes } from './utils/correctFocus';
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import { pickFocusable } from './utils/firstFocus';
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import { isGuard } from './utils/is';
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export var NEW_FOCUS = 'NEW_FOCUS';
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export var newFocus = function (innerNodes, outerNodes, activeElement, lastNode) {
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var cnt = innerNodes.length;
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var firstFocus = innerNodes[0];
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var lastFocus = innerNodes[cnt - 1];
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var isOnGuard = isGuard(activeElement);
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if (innerNodes.indexOf(activeElement) >= 0) {
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return undefined;
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}
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var activeIndex = outerNodes.indexOf(activeElement);
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var lastIndex = lastNode ? outerNodes.indexOf(lastNode) : activeIndex;
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var lastNodeInside = lastNode ? innerNodes.indexOf(lastNode) : -1;
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var indexDiff = activeIndex - lastIndex;
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var firstNodeIndex = outerNodes.indexOf(firstFocus);
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var lastNodeIndex = outerNodes.indexOf(lastFocus);
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var correctedNodes = correctNodes(outerNodes);
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var correctedIndexDiff = correctedNodes.indexOf(activeElement) - (lastNode ? correctedNodes.indexOf(lastNode) : activeIndex);
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var returnFirstNode = pickFocusable(innerNodes, 0);
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var returnLastNode = pickFocusable(innerNodes, cnt - 1);
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if (activeIndex === -1 || lastNodeInside === -1) {
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return NEW_FOCUS;
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}
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if (!indexDiff && lastNodeInside >= 0) {
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return lastNodeInside;
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}
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if (activeIndex <= firstNodeIndex && isOnGuard && Math.abs(indexDiff) > 1) {
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return returnLastNode;
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}
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if (activeIndex >= lastNodeIndex && isOnGuard && Math.abs(indexDiff) > 1) {
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return returnFirstNode;
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}
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if (indexDiff && Math.abs(correctedIndexDiff) > 1) {
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return lastNodeInside;
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}
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if (activeIndex <= firstNodeIndex) {
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return returnLastNode;
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}
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if (activeIndex > lastNodeIndex) {
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return returnFirstNode;
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}
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if (indexDiff) {
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if (Math.abs(indexDiff) > 1) {
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return lastNodeInside;
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}
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return (cnt + lastNodeInside + indexDiff) % cnt;
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}
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return undefined;
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};
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