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import { AnnotationInfo } from '../api';
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export interface SelectionInfo {
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startElementId: number;
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endElementId: number;
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startPositionOriginalDocument: number;
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endPositionOriginalDocument: number;
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selectionLengthOriginalDocument: number;
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}
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export function GetSelectionInfo(annotation: AnnotationInfo): SelectionInfo | null {
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const selection = window.getSelection();
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if (!selection) {
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return null;
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}
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if (!annotation?.tagStartPositions || !annotation.tagLengths) {
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console.log('start or lengths not found');
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return null;
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}
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let startTag = selection.anchorNode;
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let endTag = selection.focusNode;
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if (!startTag || !endTag) {
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console.log('Selection not found');
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return null;
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}
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if (startTag.nodeName.includes('#')) {
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startTag = startTag.parentNode;
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}
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if (endTag.nodeName.includes('#')) {
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endTag = endTag.parentNode;
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}
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if (!startTag || !endTag) {
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console.log('Selection element not found');
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return null;
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}
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if (!(startTag instanceof Element)) {
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console.log('StartTag is not instance of Element');
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return null;
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}
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if (!(endTag instanceof Element)) {
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console.log('EndTag is not instance of Element');
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return null;
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}
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let startElement = startTag as Element;
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let endElement = endTag as Element;
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let startId: number = Number(startElement.getAttribute('aswi-tag-id')) ?? -1;
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let endId: number = Number(endElement.getAttribute('aswi-tag-id')) ?? -1;
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let startPosition =
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annotation.tagStartPositions[startId] +
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annotation.tagLengths[startId] +
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selection.anchorOffset;
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let endPosition =
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annotation.tagStartPositions[endId] +
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annotation.tagLengths[endId] +
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selection.focusOffset -
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1;
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// need to switch start and end elements (selection was in the opposite way then expected)
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if (startPosition > endPosition) {
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let temp = startPosition;
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startPosition = endPosition;
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endPosition = temp;
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temp = startId;
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startId = endId;
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endId = temp;
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const tempElement = startElement;
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startElement = endElement;
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endElement = tempElement;
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}
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const length = endPosition - startPosition + 1;
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return {
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endElementId: endId,
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startElementId: startId,
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startPositionOriginalDocument: startPosition,
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endPositionOriginalDocument: endPosition,
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selectionLengthOriginalDocument: length,
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};
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}
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