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{"version":3,"file":"style-map.js","sources":["../src/directives/style-map.ts"],"sourcesContent":["/**\n * @license\n * Copyright 2018 Google LLC\n * SPDX-License-Identifier: BSD-3-Clause\n */\n\nimport {AttributePart, noChange} from '../lit-html.js';\nimport {\n directive,\n Directive,\n DirectiveParameters,\n PartInfo,\n PartType,\n} from '../directive.js';\n\n/**\n * A key-value set of CSS properties and values.\n *\n * The key should be either a valid CSS property name string, like\n * `'background-color'`, or a valid JavaScript camel case property name\n * for CSSStyleDeclaration like `backgroundColor`.\n */\nexport interface StyleInfo {\n [name: string]: string | number | undefined | null;\n}\n\nconst important = 'important';\n// The leading space is important\nconst importantFlag = ' !' + important;\n// How many characters to remove from a value, as a negative number\nconst flagTrim = 0 - importantFlag.length;\n\nclass StyleMapDirective extends Directive {\n private _previousStyleProperties?: Set<string>;\n\n constructor(partInfo: PartInfo) {\n super(partInfo);\n if (\n partInfo.type !== PartType.ATTRIBUTE ||\n partInfo.name !== 'style' ||\n (partInfo.strings?.length as number) > 2\n ) {\n throw new Error(\n 'The `styleMap` directive must be used in the `style` attribute ' +\n 'and must be the only part in the attribute.'\n );\n }\n }\n\n render(styleInfo: Readonly<StyleInfo>) {\n return Object.keys(styleInfo).reduce((style, prop) => {\n const value = styleInfo[prop];\n if (value == null) {\n return style;\n }\n // Convert property names from camel-case to dash-case, i.e.:\n // `backgroundColor` -> `background-color`\n // Vendor-prefixed names need an extra `-` appended to front:\n // `webkitAppearance` -> `-webkit-appearance`\n // Exception is any property name containing a dash, including\n // custom properties; we assume these are already dash-cased i.e.:\n // `--my-button-color` --> `--my-button-color`\n prop = prop.includes('-')\n ? prop\n : prop\n .replace(/(?:^(webkit|moz|ms|o)|)(?=[A-Z])/g, '-$&')\n .toLowerCase();\n return style + `${prop}:${value};`;\n }, '');\n }\n\n override update(part: AttributePart, [styleInfo]: DirectiveParameters<this>) {\n const {style} = part.element as HTMLElement;\n\n if (this._previousStyleProperties === undefined) {\n this._previousStyleProperties = new Set(Object.keys(styleInfo));\n return this.render(styleInfo);\n }\n\n // Remove old properties that no longer exist in styleInfo\n for (const name of this._previousStyleProperties) {\n // If the name isn't in styleInfo or it's null/undefined\n if (styleInfo[name] == null) {\n this._previousStyleProperties!.delete(name);\n if (name.includes('-')) {\n style.removeProperty(name);\n } else {\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n (style as any)[name] = null;\n }\n }\n }\n\n // Add or update properties\n for (const name in styleInfo) {\n const value = styleInfo[name];\n if (value != null) {\n this._previousStyleProperties.add(name);\n const isImportant =\n typeof value === 'string' && value.endsWith(importantFlag);\n if (name.includes('-') || isImportant) {\n style.setProperty(\n name,\n isImportant\n ? (value as string).slice(0, flagTrim)\n : (value as string),\n isImportant ? important : ''\n );\n } else {\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\n (style as any)[name] = value;\n }\n }\n }\n return noChange;\n }\n}\n\n/**\n * A directive that applies CSS properties to an element.\n *\n * `styleMap` can only be used in the `style` attribute and must be the only\n * expression in the attribute. It takes the property names in the\n * {@link StyleInfo styleInfo} object and adds the properties to the inline\n * style of the element.\n *\n * Property names with dashes (`-`) are assumed to be valid CSS\n * property names and set on the element's style object using `setProperty()`.\n * Names without dashes are assumed to be camelCased JavaScript property names\n * and set on the element's style object using property assignment, allowing the\n * style object to translate JavaScript-style names to CSS property names.\n *\n * For example `styleMap({backgroundColor: 'red', 'border-top': '5px', '--size':\n * '0'})` sets the `background-color`, `border-top` and `--size` properties.\n *\n * @param styleInfo\n * @see {@link https://lit.dev/docs/templates/directives/#stylemap styleMap code samples on Lit.dev}\n */\nexport const styleMap = directive(StyleMapDirective);\n\n/**\n * The type of the class that powers this directive. Necessary for naming the\n * directive's return type.\n */\nexport type {StyleMapDirective};\n"],"names":["important","importantFlag","styleMap","directive","Directive","constructor","partInfo","super","type","PartType","ATTRIBUTE","name","strings","length","Error","render","styleInfo","Object","keys","reduce","style","prop","value","includes","replace","toLowerCase","update","part","element","undefined","this","_previousStyleProperties","Set","delete","removeProperty","add","isImportant","endsWith","setProperty","slice","noChange"],"mappings":";;;;;GA0BA,MAAMA,EAAY,YAEZC,EAAgB,KAAOD,EA8GhBE,EAAWC,EA1GxB,cAAgCC,EAG9B,WAAAC,CAAYC,GAEV,GADAC,MAAMD,GAEJA,EAASE,OAASC,EAASC,WACT,UAAlBJ,EAASK,MACRL,EAASM,SAASC,OAAoB,EAEvC,MAAUC,MACR,6GAIL,CAED,MAAAC,CAAOC,GACL,OAAOC,OAAOC,KAAKF,GAAWG,QAAO,CAACC,EAAOC,KAC3C,MAAMC,EAAQN,EAAUK,GACxB,OAAa,MAATC,EACKF,EAcFA,EAAQ,GALfC,EAAOA,EAAKE,SAAS,KACjBF,EACAA,EACGG,QAAQ,oCAAqC,OAC7CC,iBACmBH,IAAQ,GACjC,GACJ,CAEQ,MAAAI,CAAOC,GAAsBX,IACpC,MAAMI,MAACA,GAASO,EAAKC,QAErB,QAAsCC,IAAlCC,KAAKC,GAEP,OADAD,KAAKC,GAA2B,IAAIC,IAAIf,OAAOC,KAAKF,IAC7Cc,KAAKf,OAAOC,GAIrB,IAAK,MAAML,KAAQmB,KAAKC,GAEC,MAAnBf,EAAUL,KACZmB,KAAKC,GAA0BE,OAAOtB,GAClCA,EAAKY,SAAS,KAChBH,EAAMc,eAAevB,GAGpBS,EAAcT,GAAQ,MAM7B,IAAK,MAAMA,KAAQK,EAAW,CAC5B,MAAMM,EAAQN,EAAUL,GACxB,GAAa,MAATW,EAAe,CACjBQ,KAAKC,GAAyBI,IAAIxB,GAClC,MAAMyB,EACa,iBAAVd,GAAsBA,EAAMe,SAASpC,GAC1CU,EAAKY,SAAS,MAAQa,EACxBhB,EAAMkB,YACJ3B,EACAyB,EACKd,EAAiBiB,MAAM,GA1EvB,IA2EAjB,EACLc,EAAcpC,EAAY,IAI3BoB,EAAcT,GAAQW,CAE1B,CACF,CACD,OAAOkB,CACR"} |