@tldraw/editor/dist-esm/lib/editor/managers/TextManager.mjs.map

A tiny little drawing app (editor).

{
  "version": 3,
  "sources": ["../../../../src/lib/editor/managers/TextManager.ts"],
  "sourcesContent": ["import { BoxModel, TLDefaultHorizontalAlignStyle } from '@tldraw/tlschema'\nimport { Editor } from '../Editor'\n\nconst fixNewLines = /\\r?\\n|\\r/g\n\nfunction normalizeTextForDom(text: string) {\n\treturn text\n\t\t.replace(fixNewLines, '\\n')\n\t\t.split('\\n')\n\t\t.map((x) => x || ' ')\n\t\t.join('\\n')\n}\n\nconst textAlignmentsForLtr = {\n\tstart: 'left',\n\t'start-legacy': 'left',\n\tmiddle: 'center',\n\t'middle-legacy': 'center',\n\tend: 'right',\n\t'end-legacy': 'right',\n}\n\n/** @public */\nexport interface TLMeasureTextSpanOpts {\n\toverflow: 'wrap' | 'truncate-ellipsis' | 'truncate-clip'\n\twidth: number\n\theight: number\n\tpadding: number\n\tfontSize: number\n\tfontWeight: string\n\tfontFamily: string\n\tfontStyle: string\n\tlineHeight: number\n\ttextAlign: TLDefaultHorizontalAlignStyle\n}\n\nconst spaceCharacterRegex = /\\s/\n\n/** @public */\nexport class TextManager {\n\tprivate baseElem: HTMLDivElement\n\n\tconstructor(public editor: Editor) {\n\t\tthis.baseElem = document.createElement('div')\n\t\tthis.baseElem.classList.add('tl-text')\n\t\tthis.baseElem.classList.add('tl-text-measure')\n\t\tthis.baseElem.tabIndex = -1\n\t}\n\n\tmeasureText(\n\t\ttextToMeasure: string,\n\t\topts: {\n\t\t\tfontStyle: string\n\t\t\tfontWeight: string\n\t\t\tfontFamily: string\n\t\t\tfontSize: number\n\t\t\tlineHeight: number\n\t\t\t/**\n\t\t\t * When maxWidth is a number, the text will be wrapped to that maxWidth. When maxWidth\n\t\t\t * is null, the text will be measured without wrapping, but explicit line breaks and\n\t\t\t * space are preserved.\n\t\t\t */\n\t\t\tmaxWidth: null | number\n\t\t\tminWidth?: null | number\n\t\t\tpadding: string\n\t\t\tdisableOverflowWrapBreaking?: boolean\n\t\t}\n\t): BoxModel & { scrollWidth: number } {\n\t\tconst div = document.createElement('div')\n\t\tdiv.textContent = normalizeTextForDom(textToMeasure)\n\t\treturn this.measureHtml(div.innerHTML, opts)\n\t}\n\n\tmeasureHtml(\n\t\thtml: string,\n\t\topts: {\n\t\t\tfontStyle: string\n\t\t\tfontWeight: string\n\t\t\tfontFamily: string\n\t\t\tfontSize: number\n\t\t\tlineHeight: number\n\t\t\t/**\n\t\t\t * When maxWidth is a number, the text will be wrapped to that maxWidth. When maxWidth\n\t\t\t * is null, the text will be measured without wrapping, but explicit line breaks and\n\t\t\t * space are preserved.\n\t\t\t */\n\t\t\tmaxWidth: null | number\n\t\t\tminWidth?: null | number\n\t\t\tpadding: string\n\t\t\tdisableOverflowWrapBreaking?: boolean\n\t\t}\n\t): BoxModel & { scrollWidth: number } {\n\t\t// Duplicate our base element; we don't need to clone deep\n\t\tconst wrapperElm = this.baseElem.cloneNode() as HTMLDivElement\n\t\tthis.editor.getContainer().appendChild(wrapperElm)\n\t\twrapperElm.innerHTML = html\n\t\tthis.baseElem.insertAdjacentElement('afterend', wrapperElm)\n\n\t\twrapperElm.setAttribute('dir', 'auto')\n\t\t// N.B. This property, while discouraged (\"intended for Document Type Definition (DTD) designers\")\n\t\t// is necessary for ensuring correct mixed RTL/LTR behavior when exporting SVGs.\n\t\twrapperElm.style.setProperty('unicode-bidi', 'plaintext')\n\t\twrapperElm.style.setProperty('font-family', opts.fontFamily)\n\t\twrapperElm.style.setProperty('font-style', opts.fontStyle)\n\t\twrapperElm.style.setProperty('font-weight', opts.fontWeight)\n\t\twrapperElm.style.setProperty('font-size', opts.fontSize + 'px')\n\t\twrapperElm.style.setProperty('line-height', opts.lineHeight * opts.fontSize + 'px')\n\t\twrapperElm.style.setProperty('max-width', opts.maxWidth === null ? null : opts.maxWidth + 'px')\n\t\twrapperElm.style.setProperty('min-width', opts.minWidth === null ? null : opts.minWidth + 'px')\n\t\twrapperElm.style.setProperty('padding', opts.padding)\n\t\twrapperElm.style.setProperty(\n\t\t\t'overflow-wrap',\n\t\t\topts.disableOverflowWrapBreaking ? 'normal' : 'break-word'\n\t\t)\n\n\t\tconst scrollWidth = wrapperElm.scrollWidth\n\t\tconst rect = wrapperElm.getBoundingClientRect()\n\t\twrapperElm.remove()\n\n\t\treturn {\n\t\t\tx: 0,\n\t\t\ty: 0,\n\t\t\tw: rect.width,\n\t\t\th: rect.height,\n\t\t\tscrollWidth,\n\t\t}\n\t}\n\n\t/**\n\t * Given an html element, measure the position of each span of unbroken\n\t * word/white-space characters within any text nodes it contains.\n\t */\n\tmeasureElementTextNodeSpans(\n\t\telement: HTMLElement,\n\t\t{ shouldTruncateToFirstLine = false }: { shouldTruncateToFirstLine?: boolean } = {}\n\t): { spans: { box: BoxModel; text: string }[]; didTruncate: boolean } {\n\t\tconst spans = []\n\n\t\t// Measurements of individual spans are relative to the containing element\n\t\tconst elmBounds = element.getBoundingClientRect()\n\t\tconst offsetX = -elmBounds.left\n\t\tconst offsetY = -elmBounds.top\n\n\t\t// we measure by creating a range that spans each character in the elements text node\n\t\tconst range = new Range()\n\t\tconst textNode = element.childNodes[0]\n\t\tlet idx = 0\n\n\t\tlet currentSpan = null\n\t\tlet prevCharWasSpaceCharacter = null\n\t\tlet prevCharTop = 0\n\t\tlet prevCharLeftForRTLTest = 0\n\t\tlet didTruncate = false\n\t\tfor (const childNode of element.childNodes) {\n\t\t\tif (childNode.nodeType !== Node.TEXT_NODE) continue\n\n\t\t\tfor (const char of childNode.textContent ?? '') {\n\t\t\t\t// place the range around the characters we're interested in\n\t\t\t\trange.setStart(textNode, idx)\n\t\t\t\trange.setEnd(textNode, idx + char.length)\n\t\t\t\t// measure the range. some browsers return multiple rects for the\n\t\t\t\t// first char in a new line - one for the line break, and one for\n\t\t\t\t// the character itself. we're only interested in the character.\n\t\t\t\tconst rects = range.getClientRects()\n\t\t\t\tconst rect = rects[rects.length - 1]!\n\n\t\t\t\t// calculate the position of the character relative to the element\n\t\t\t\tconst top = rect.top + offsetY\n\t\t\t\tconst left = rect.left + offsetX\n\t\t\t\tconst right = rect.right + offsetX\n\t\t\t\tconst isRTL = left < prevCharLeftForRTLTest\n\n\t\t\t\tconst isSpaceCharacter = spaceCharacterRegex.test(char)\n\t\t\t\tif (\n\t\t\t\t\t// If we're at a word boundary...\n\t\t\t\t\tisSpaceCharacter !== prevCharWasSpaceCharacter ||\n\t\t\t\t\t// ...or we're on a different line...\n\t\t\t\t\ttop !== prevCharTop ||\n\t\t\t\t\t// ...or we're at the start of the text and haven't created a span yet...\n\t\t\t\t\t!currentSpan\n\t\t\t\t) {\n\t\t\t\t\t// ...then we're at a span boundary!\n\n\t\t\t\t\tif (currentSpan) {\n\t\t\t\t\t\t// if we're truncating to a single line & we just finished the first line, stop there\n\t\t\t\t\t\tif (shouldTruncateToFirstLine && top !== prevCharTop) {\n\t\t\t\t\t\t\tdidTruncate = true\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t}\n\t\t\t\t\t\t// otherwise add the span to the list ready to start a new one\n\t\t\t\t\t\tspans.push(currentSpan)\n\t\t\t\t\t}\n\n\t\t\t\t\t// start a new span\n\t\t\t\t\tcurrentSpan = {\n\t\t\t\t\t\tbox: { x: left, y: top, w: rect.width, h: rect.height },\n\t\t\t\t\t\ttext: char,\n\t\t\t\t\t}\n\t\t\t\t\tprevCharLeftForRTLTest = left\n\t\t\t\t} else {\n\t\t\t\t\t// Looks like we're in RTL mode, so we need to adjust the left position.\n\t\t\t\t\tif (isRTL) {\n\t\t\t\t\t\tcurrentSpan.box.x = left\n\t\t\t\t\t}\n\n\t\t\t\t\t// otherwise we just need to extend the current span with the next character\n\t\t\t\t\tcurrentSpan.box.w = isRTL ? currentSpan.box.w + rect.width : right - currentSpan.box.x\n\t\t\t\t\tcurrentSpan.text += char\n\t\t\t\t}\n\n\t\t\t\tif (char === '\\n') {\n\t\t\t\t\tprevCharLeftForRTLTest = 0\n\t\t\t\t}\n\n\t\t\t\tprevCharWasSpaceCharacter = isSpaceCharacter\n\t\t\t\tprevCharTop = top\n\t\t\t\tidx += char.length\n\t\t\t}\n\t\t}\n\n\t\t// Add the last span\n\t\tif (currentSpan) {\n\t\t\tspans.push(currentSpan)\n\t\t}\n\n\t\treturn { spans, didTruncate }\n\t}\n\n\t/**\n\t * Measure text into individual spans. Spans are created by rendering the\n\t * text, then dividing it up according to line breaks and word boundaries.\n\t *\n\t * It works by having the browser render the text, then measuring the\n\t * position of each character. You can use this to replicate the text-layout\n\t * algorithm of the current browser in e.g. an SVG export.\n\t */\n\tmeasureTextSpans(\n\t\ttextToMeasure: string,\n\t\topts: TLMeasureTextSpanOpts\n\t): { text: string; box: BoxModel }[] {\n\t\tif (textToMeasure === '') return []\n\n\t\tconst elm = this.baseElem.cloneNode() as HTMLDivElement\n\t\tthis.editor.getContainer().appendChild(elm)\n\n\t\tconst elementWidth = Math.ceil(opts.width - opts.padding * 2)\n\t\telm.setAttribute('dir', 'auto')\n\t\t// N.B. This property, while discouraged (\"intended for Document Type Definition (DTD) designers\")\n\t\t// is necessary for ensuring correct mixed RTL/LTR behavior when exporting SVGs.\n\t\telm.style.setProperty('unicode-bidi', 'plaintext')\n\t\telm.style.setProperty('width', `${elementWidth}px`)\n\t\telm.style.setProperty('height', 'min-content')\n\t\telm.style.setProperty('font-size', `${opts.fontSize}px`)\n\t\telm.style.setProperty('font-family', opts.fontFamily)\n\t\telm.style.setProperty('font-weight', opts.fontWeight)\n\t\telm.style.setProperty('line-height', `${opts.lineHeight * opts.fontSize}px`)\n\t\telm.style.setProperty('text-align', textAlignmentsForLtr[opts.textAlign])\n\t\telm.style.setProperty('font-style', opts.fontStyle)\n\n\t\tconst shouldTruncateToFirstLine =\n\t\t\topts.overflow === 'truncate-ellipsis' || opts.overflow === 'truncate-clip'\n\n\t\tif (shouldTruncateToFirstLine) {\n\t\t\telm.style.setProperty('overflow-wrap', 'anywhere')\n\t\t\telm.style.setProperty('word-break', 'break-all')\n\t\t}\n\n\t\tconst normalizedText = normalizeTextForDom(textToMeasure)\n\n\t\t// Render the text into the measurement element:\n\t\telm.textContent = normalizedText\n\n\t\t// actually measure the text:\n\t\tconst { spans, didTruncate } = this.measureElementTextNodeSpans(elm, {\n\t\t\tshouldTruncateToFirstLine,\n\t\t})\n\n\t\tif (opts.overflow === 'truncate-ellipsis' && didTruncate) {\n\t\t\t// we need to measure the ellipsis to know how much space it takes up\n\t\t\telm.textContent = '\u2026'\n\t\t\tconst ellipsisWidth = Math.ceil(this.measureElementTextNodeSpans(elm).spans[0].box.w)\n\n\t\t\t// then, we need to subtract that space from the width we have and measure again:\n\t\t\telm.style.setProperty('width', `${elementWidth - ellipsisWidth}px`)\n\t\t\telm.textContent = normalizedText\n\t\t\tconst truncatedSpans = this.measureElementTextNodeSpans(elm, {\n\t\t\t\tshouldTruncateToFirstLine: true,\n\t\t\t}).spans\n\n\t\t\t// Finally, we add in our ellipsis at the end of the last span. We\n\t\t\t// have to do this after measuring, not before, because adding the\n\t\t\t// ellipsis changes how whitespace might be getting collapsed by the\n\t\t\t// browser.\n\t\t\tconst lastSpan = truncatedSpans[truncatedSpans.length - 1]!\n\t\t\ttruncatedSpans.push({\n\t\t\t\ttext: '\u2026',\n\t\t\t\tbox: {\n\t\t\t\t\tx: Math.min(lastSpan.box.x + lastSpan.box.w, opts.width - opts.padding - ellipsisWidth),\n\t\t\t\t\ty: lastSpan.box.y,\n\t\t\t\t\tw: ellipsisWidth,\n\t\t\t\t\th: lastSpan.box.h,\n\t\t\t\t},\n\t\t\t})\n\t\t\treturn truncatedSpans\n\t\t}\n\n\t\telm.remove()\n\n\t\treturn spans\n\t}\n}\n"],
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