50 lines
1.9 KiB
JavaScript
50 lines
1.9 KiB
JavaScript
/**
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* ParagraphLayout Module
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* Interfaces with the Knuth-Plass line breaking algorithm to calculate optimal line breaks.
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*/
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export class ParagraphLayout {
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/**
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* Create a new ParagraphLayout
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* @param {Function} kapAlgorithm - The Knuth and Plass algorithm function
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* @param {Function} measureTextFunc - Function to measure text width
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*/
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constructor(kapAlgorithm, measureTextFunc) {
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this.kapAlgorithm = kapAlgorithm;
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this.measureText = measureTextFunc;
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}
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/**
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* Calculate layout for a paragraph
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* @param {string} processedText - The pre-processed text (with SmartyPants and hyphenation)
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* @param {Array<number>} measures - Array of line width measurements
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* @param {boolean} debug - Whether to enable debug output
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* @param {Function} [measureFunc] - Optional specific measurement function for this call
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* @returns {Object} Layout data with nodes and breaks
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*/
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calculateLayout(processedText, measures, hyphenate = false, measureFunc = null) {
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const measure = measureFunc || this.measureText; // Use provided func or fallback to instance default
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if (typeof measure !== 'function') {
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console.error("ParagraphLayout: Invalid measure function provided or stored.");
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// Return a dummy layout or throw an error?
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return { nodes: [], breaks: [] }; // Return empty layout
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}
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return this.kapAlgorithm(processedText, measure, measures, hyphenate);
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}
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/**
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* Set a new text measurement function
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* @param {Function} measureFunc - The new measurement function
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*/
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setMeasureFunction(measureFunc) {
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this.measureText = measureFunc;
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}
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/**
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* Set a new Knuth and Plass algorithm implementation
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* @param {Function} kapFunc - The new KAP algorithm function
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*/
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setKapAlgorithm(kapFunc) {
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this.kapAlgorithm = kapFunc;
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}
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}
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