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import { Command, Extension } from '@tiptap/core';
import { TextSelection, AllSelection, Transaction } from 'prosemirror-state';
export interface IndentOptions {
types: string[];
minLevel: number;
maxLevel: number;
paddingMultiplier: number;
}
declare module '@tiptap/core' {
interface Commands<ReturnType> {
indent: {
indent: () => ReturnType;
outdent: () => ReturnType;
};
}
}
export const Indent = Extension.create<IndentOptions>({
name: 'indent',
defaultOptions: {
types: ['listItem', 'paragraph'],
minLevel: 0,
maxLevel: 8,
paddingMultiplier: 10
},
addGlobalAttributes() {
return [
{
types: this.options.types,
attributes: {
indent: {
renderHTML: attributes => (
{ style: `padding-left: ${attributes.indent * this.options.paddingMultiplier}px` }
),
parseHTML: element => Number(element.style.paddingLeft.slice(0, -2)) / this.options.paddingMultiplier
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}
}
}
];
},
addCommands() {
const setNodeIndentMarkup = (tr: Transaction, pos: number, delta: number): Transaction => {
const node = tr?.doc?.nodeAt(pos);
if (node) {
const nextLevel = (node.attrs.indent || 0) + delta;
const { minLevel, maxLevel } = this.options;
const indent = nextLevel < minLevel ? minLevel : nextLevel > maxLevel ? maxLevel : nextLevel;
if (indent !== node.attrs.indent) {
const nodeAttrs = { ...node.attrs, indent };
return tr.setNodeMarkup(pos, node.type, nodeAttrs, node.marks);
}
}
return tr;
};
const updateIndentLevel = (tr: Transaction, delta: number): Transaction => {
const { doc, selection } = tr;
if (doc && selection && (selection instanceof TextSelection || selection instanceof AllSelection)) {
const { from, to } = selection;
doc.nodesBetween(from, to, (node, pos) => {
if (this.options.types.includes(node.type.name)) {
tr = setNodeIndentMarkup(tr, pos, delta);
return false;
}
return true;
});
}
return tr;
};
const applyIndent: (direction: number) => () => Command =
direction => () => ({ tr, state, dispatch }) => {
const { selection } = state;
tr = tr.setSelection(selection);
tr = updateIndentLevel(tr, direction);
if (tr.docChanged) {
dispatch?.(tr);
return true;
}
return false;
};
return {
indent: applyIndent(1),
outdent: applyIndent(-1)
};
},
addKeyboardShortcuts() {
return {
Tab: () => this.editor.commands.indent(),
'Shift-Tab': () => this.editor.commands.outdent()
};
}
});