All files / roosterjs-content-model-plugins/lib/edit/tabUtils handleTabOnList.ts

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import { handleTabOnParagraph } from './handleTabOnParagraph';
import { setModelIndentation } from 'roosterjs-content-model-api';
import type {
    FormatContentModelContext,
    ReadonlyContentModelDocument,
    ReadonlyContentModelListItem,
} from 'roosterjs-content-model-types';
 
/**
 * 1. When the selection is collapsed and the cursor is at start of a list item, call setModelIndentation.
 * 2. Otherwise call handleTabOnParagraph.
 * @internal
 */
export function handleTabOnList(
    model: ReadonlyContentModelDocument,
    listItem: ReadonlyContentModelListItem,
    rawEvent: KeyboardEvent,
    context?: FormatContentModelContext
) {
    const selectedParagraph = findSelectedParagraph(listItem);
    if (
        !isMarkerAtStartOfBlock(listItem) &&
        selectedParagraph.length == 1 &&
        selectedParagraph[0].blockType === 'Paragraph'
    ) {
        return handleTabOnParagraph(model, selectedParagraph[0], rawEvent, context);
    } else {
        setModelIndentation(
            model,
            rawEvent.shiftKey ? 'outdent' : 'indent',
            undefined /*length*/,
            context
        );
        rawEvent.preventDefault();
        return true;
    }
}
 
function isMarkerAtStartOfBlock(listItem: ReadonlyContentModelListItem) {
    return (
        listItem.blocks[0].blockType == 'Paragraph' &&
        listItem.blocks[0].segments[0].segmentType == 'SelectionMarker'
    );
}
 
function findSelectedParagraph(listItem: ReadonlyContentModelListItem) {
    return listItem.blocks.filter(
        block =>
            block.blockType == 'Paragraph' && block.segments.some(segment => segment.isSelected)
    );
}