All files / roosterjs-content-model-plugins/lib/edit/inputSteps handleEnterOnParagraph.ts

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import { mutateBlock } from 'roosterjs-content-model-dom';
import { splitParagraph } from '../utils/splitParagraph';
import type { DeleteSelectionStep } from 'roosterjs-content-model-types';
 
/**
 * @internal
 */
export const handleEnterOnParagraph: (
    formatsToPreserveOnMerge: string[]
) => DeleteSelectionStep = formatsToPreserveOnMerge => context => {
    const { paragraph, path } = context.insertPoint;
    const paraIndex = path[0]?.blocks.indexOf(paragraph) ?? -1;
 
    if (context.deleteResult == 'notDeleted' && paraIndex >= 0) {
        const newPara = splitParagraph(
            context.insertPoint,
            false /* removeImplicitParagraph */,
            formatsToPreserveOnMerge
        );
 
        mutateBlock(path[0]).blocks.splice(paraIndex + 1, 0, newPara);
 
        context.deleteResult = 'range';
        context.lastParagraph = newPara;
        context.insertPoint.paragraph = newPara;
    }
};