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Diffstat (limited to 'src/client/util/ParagraphNodeSpec.ts')
| -rw-r--r-- | src/client/util/ParagraphNodeSpec.ts | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/src/client/util/ParagraphNodeSpec.ts b/src/client/util/ParagraphNodeSpec.ts new file mode 100644 index 000000000..3a993e1ff --- /dev/null +++ b/src/client/util/ParagraphNodeSpec.ts @@ -0,0 +1,133 @@ +import clamp from './clamp'; +import convertToCSSPTValue from './convertToCSSPTValue'; +import toCSSLineSpacing from './toCSSLineSpacing'; +import { Node, DOMOutputSpec } from 'prosemirror-model'; + +//import type { NodeSpec } from './Types'; +type NodeSpec = { + attrs?: { [key: string]: any }, + content?: string, + draggable?: boolean, + group?: string, + inline?: boolean, + name?: string, + parseDOM?: Array<any>, + toDOM?: (node: any) => DOMOutputSpec, +}; + +// This assumes that every 36pt maps to one indent level. +export const INDENT_MARGIN_PT_SIZE = 36; +export const MIN_INDENT_LEVEL = 0; +export const MAX_INDENT_LEVEL = 7; +export const ATTRIBUTE_INDENT = 'data-indent'; + +export const EMPTY_CSS_VALUE = new Set(['', '0%', '0pt', '0px']); + +const ALIGN_PATTERN = /(left|right|center|justify)/; + +// https://github.com/ProseMirror/prosemirror-schema-basic/blob/master/src/schema-basic.js +// :: NodeSpec A plain paragraph textblock. Represented in the DOM +// as a `<p>` element. +const ParagraphNodeSpec: NodeSpec = { + attrs: { + align: { default: null }, + color: { default: null }, + id: { default: null }, + indent: { default: null }, + lineSpacing: { default: null }, + // TODO: Add UI to let user edit / clear padding. + paddingBottom: { default: null }, + // TODO: Add UI to let user edit / clear padding. + paddingTop: { default: null }, + }, + content: 'inline*', + group: 'block', + parseDOM: [{ tag: 'p', getAttrs }], + toDOM, +}; + +function getAttrs(dom: HTMLElement): Object { + const { + lineHeight, + textAlign, + marginLeft, + paddingTop, + paddingBottom, + } = dom.style; + + let align = dom.getAttribute('align') || textAlign || ''; + align = ALIGN_PATTERN.test(align) ? align : ""; + + let indent = parseInt(dom.getAttribute(ATTRIBUTE_INDENT) || "", 10); + + if (!indent && marginLeft) { + indent = convertMarginLeftToIndentValue(marginLeft); + } + + indent = indent || MIN_INDENT_LEVEL; + + const lineSpacing = lineHeight ? toCSSLineSpacing(lineHeight) : null; + + const id = dom.getAttribute('id') || ''; + return { align, indent, lineSpacing, paddingTop, paddingBottom, id }; +} + +function toDOM(node: Node): DOMOutputSpec { + const { + align, + indent, + lineSpacing, + paddingTop, + paddingBottom, + id, + } = node.attrs; + const attrs: { [key: string]: any } | null = {}; + + let style = ''; + if (align && align !== 'left') { + style += `text-align: ${align};`; + } + + if (lineSpacing) { + const cssLineSpacing = toCSSLineSpacing(lineSpacing); + style += + `line-height: ${cssLineSpacing};` + + // This creates the local css variable `--czi-content-line-height` + // that its children may apply. + `--czi-content-line-height: ${cssLineSpacing}`; + } + + if (paddingTop && !EMPTY_CSS_VALUE.has(paddingTop)) { + style += `padding-top: ${paddingTop};`; + } + + if (paddingBottom && !EMPTY_CSS_VALUE.has(paddingBottom)) { + style += `padding-bottom: ${paddingBottom};`; + } + + style && (attrs.style = style); + + if (indent) { + attrs[ATTRIBUTE_INDENT] = String(indent); + } + + if (id) { + attrs.id = id; + } + + return ['p', attrs, 0]; +} + +export const toParagraphDOM = toDOM; +export const getParagraphNodeAttrs = getAttrs; + +export function convertMarginLeftToIndentValue(marginLeft: string): number { + const ptValue = convertToCSSPTValue(marginLeft); + return clamp( + MIN_INDENT_LEVEL, + Math.floor(ptValue / INDENT_MARGIN_PT_SIZE), + MAX_INDENT_LEVEL + ); +} + +export default ParagraphNodeSpec;
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