vue-files-preview-inno/es/node_modules/epubjs/src/layout.mjs.map

A tool for previewing files such as doc, excel, pdf, image, markdown, txt, audio, and video and so on.

{"version":3,"file":"layout.mjs","sources":["../../../../../node_modules/epubjs/src/layout.js"],"sourcesContent":["import { extend } from \"./utils/core\";\nimport { EVENTS } from \"./utils/constants\";\nimport EventEmitter from \"event-emitter\";\n\n/**\n * Figures out the CSS values to apply for a layout\n * @class\n * @param {object} settings\n * @param {string} [settings.layout='reflowable']\n * @param {string} [settings.spread]\n * @param {number} [settings.minSpreadWidth=800]\n * @param {boolean} [settings.evenSpreads=false]\n */\nclass Layout {\n\tconstructor(settings) {\n\t\tthis.settings = settings;\n\t\tthis.name = settings.layout || \"reflowable\";\n\t\tthis._spread = (settings.spread === \"none\") ? false : true;\n\t\tthis._minSpreadWidth = settings.minSpreadWidth || 800;\n\t\tthis._evenSpreads = settings.evenSpreads || false;\n\n\t\tif (settings.flow === \"scrolled\" ||\n\t\t\t\tsettings.flow === \"scrolled-continuous\" ||\n\t\t\t\tsettings.flow === \"scrolled-doc\") {\n\t\t\tthis._flow = \"scrolled\";\n\t\t} else {\n\t\t\tthis._flow = \"paginated\";\n\t\t}\n\n\n\t\tthis.width = 0;\n\t\tthis.height = 0;\n\t\tthis.spreadWidth = 0;\n\t\tthis.delta = 0;\n\n\t\tthis.columnWidth = 0;\n\t\tthis.gap = 0;\n\t\tthis.divisor = 1;\n\n\t\tthis.props = {\n\t\t\tname: this.name,\n\t\t\tspread: this._spread,\n\t\t\tflow: this._flow,\n\t\t\twidth: 0,\n\t\t\theight: 0,\n\t\t\tspreadWidth: 0,\n\t\t\tdelta: 0,\n\t\t\tcolumnWidth: 0,\n\t\t\tgap: 0,\n\t\t\tdivisor: 1\n\t\t};\n\n\t}\n\n\t/**\n\t * Switch the flow between paginated and scrolled\n\t * @param  {string} flow paginated | scrolled\n\t * @return {string} simplified flow\n\t */\n\tflow(flow) {\n\t\tif (typeof(flow) != \"undefined\") {\n\t\t\tif (flow === \"scrolled\" ||\n\t\t\t\t\tflow === \"scrolled-continuous\" ||\n\t\t\t\t\tflow === \"scrolled-doc\") {\n\t\t\t\tthis._flow = \"scrolled\";\n\t\t\t} else {\n\t\t\t\tthis._flow = \"paginated\";\n\t\t\t}\n\t\t\t// this.props.flow = this._flow;\n\t\t\tthis.update({flow: this._flow});\n\t\t}\n\t\treturn this._flow;\n\t}\n\n\t/**\n\t * Switch between using spreads or not, and set the\n\t * width at which they switch to single.\n\t * @param  {string} spread \"none\" | \"always\" | \"auto\"\n\t * @param  {number} min integer in pixels\n\t * @return {boolean} spread true | false\n\t */\n\tspread(spread, min) {\n\n\t\tif (spread) {\n\t\t\tthis._spread = (spread === \"none\") ? false : true;\n\t\t\t// this.props.spread = this._spread;\n\t\t\tthis.update({spread: this._spread});\n\t\t}\n\n\t\tif (min >= 0) {\n\t\t\tthis._minSpreadWidth = min;\n\t\t}\n\n\t\treturn this._spread;\n\t}\n\n\t/**\n\t * Calculate the dimensions of the pagination\n\t * @param  {number} _width  width of the rendering\n\t * @param  {number} _height height of the rendering\n\t * @param  {number} _gap    width of the gap between columns\n\t */\n\tcalculate(_width, _height, _gap){\n\n\t\tvar divisor = 1;\n\t\tvar gap = _gap || 0;\n\n\t\t//-- Check the width and create even width columns\n\t\t// var fullWidth = Math.floor(_width);\n\t\tvar width = _width;\n\t\tvar height = _height;\n\n\t\tvar section = Math.floor(width / 12);\n\n\t\tvar columnWidth;\n\t\tvar spreadWidth;\n\t\tvar pageWidth;\n\t\tvar delta;\n\n\t\tif (this._spread && width >= this._minSpreadWidth) {\n\t\t\tdivisor = 2;\n\t\t} else {\n\t\t\tdivisor = 1;\n\t\t}\n\n\t\tif (this.name === \"reflowable\" && this._flow === \"paginated\" && !(_gap >= 0)) {\n\t\t\tgap = ((section % 2 === 0) ? section : section - 1);\n\t\t}\n\n\t\tif (this.name === \"pre-paginated\" ) {\n\t\t\tgap = 0;\n\t\t}\n\n\t\t//-- Double Page\n\t\tif(divisor > 1) {\n\t\t\t// width = width - gap;\n\t\t\t// columnWidth = (width - gap) / divisor;\n\t\t\t// gap = gap / divisor;\n\t\t\tcolumnWidth = (width / divisor) - gap;\n\t\t\tpageWidth = columnWidth + gap;\n\t\t} else {\n\t\t\tcolumnWidth = width;\n\t\t\tpageWidth = width;\n\t\t}\n\n\t\tif (this.name === \"pre-paginated\" && divisor > 1) {\n\t\t\twidth = columnWidth;\n\t\t}\n\n\t\tspreadWidth = (columnWidth * divisor) + gap;\n\n\t\tdelta = width;\n\n\t\tthis.width = width;\n\t\tthis.height = height;\n\t\tthis.spreadWidth = spreadWidth;\n\t\tthis.pageWidth = pageWidth;\n\t\tthis.delta = delta;\n\n\t\tthis.columnWidth = columnWidth;\n\t\tthis.gap = gap;\n\t\tthis.divisor = divisor;\n\n\t\t// this.props.width = width;\n\t\t// this.props.height = _height;\n\t\t// this.props.spreadWidth = spreadWidth;\n\t\t// this.props.pageWidth = pageWidth;\n\t\t// this.props.delta = delta;\n\t\t//\n\t\t// this.props.columnWidth = colWidth;\n\t\t// this.props.gap = gap;\n\t\t// this.props.divisor = divisor;\n\n\t\tthis.update({\n\t\t\twidth,\n\t\t\theight,\n\t\t\tspreadWidth,\n\t\t\tpageWidth,\n\t\t\tdelta,\n\t\t\tcolumnWidth,\n\t\t\tgap,\n\t\t\tdivisor\n\t\t});\n\n\t}\n\n\t/**\n\t * Apply Css to a Document\n\t * @param  {Contents} contents\n\t * @return {Promise}\n\t */\n\tformat(contents, section, axis){\n\t\tvar formating;\n\n\t\tif (this.name === \"pre-paginated\") {\n\t\t\tformating = contents.fit(this.columnWidth, this.height, section);\n\t\t} else if (this._flow === \"paginated\") {\n\t\t\tformating = contents.columns(this.width, this.height, this.columnWidth, this.gap, this.settings.direction);\n\t\t} else if (axis && axis === \"horizontal\") {\n\t\t\tformating = contents.size(null, this.height);\n\t\t} else {\n\t\t\tformating = contents.size(this.width, null);\t\t\t\t\n\t\t}\n\n\t\treturn formating; // might be a promise in some View Managers\n\t}\n\n\t/**\n\t * Count number of pages\n\t * @param  {number} totalLength\n\t * @param  {number} pageLength\n\t * @return {{spreads: Number, pages: Number}}\n\t */\n\tcount(totalLength, pageLength) {\n\n\t\tlet spreads, pages;\n\n\t\tif (this.name === \"pre-paginated\") {\n\t\t\tspreads = 1;\n\t\t\tpages = 1;\n\t\t} else if (this._flow === \"paginated\") {\n\t\t\tpageLength = pageLength || this.delta;\n\t\t\tspreads = Math.ceil( totalLength / pageLength);\n\t\t\tpages = spreads * this.divisor;\n\t\t} else { // scrolled\n\t\t\tpageLength = pageLength || this.height;\n\t\t\tspreads = Math.ceil( totalLength / pageLength);\n\t\t\tpages = spreads;\n\t\t}\n\n\t\treturn {\n\t\t\tspreads,\n\t\t\tpages\n\t\t};\n\n\t}\n\n\t/**\n\t * Update props that have changed\n\t * @private\n\t * @param  {object} props\n\t */\n\tupdate(props) {\n\t\t// Remove props that haven't changed\n\t\tObject.keys(props).forEach((propName) => {\n\t\t\tif (this.props[propName] === props[propName]) {\n\t\t\t\tdelete props[propName];\n\t\t\t}\n\t\t});\n\n\t\tif(Object.keys(props).length > 0) {\n\t\t\tlet newProps = extend(this.props, props);\n\t\t\tthis.emit(EVENTS.LAYOUT.UPDATED, newProps, props);\n\t\t}\n\t}\n}\n\nEventEmitter(Layout.prototype);\n\nexport default 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