substance/editor/SwitchTextTypeCommand.js

Substance is a JavaScript library for web-based content editing. It provides building blocks for realizing custom text editors and web-based publishing system. It is developed to power our online editing platform [Substance](http://substance.io).

import { isMatch } from '../util'
import Command from './Command'

export default class SwitchTextTypeCommand extends Command {
  constructor (config) {
    super(config)
    if (!config.spec) {
      throw new Error("'config.spec' is mandatory")
    }
    if (!config.spec.type) {
      throw new Error("'config.spec.type' is mandatory")
    }
  }

  getType () {
    return this.config.spec.type
  }

  getCommandState (params) {
    const editorSession = params.editorSession
    const doc = editorSession.getDocument()
    const sel = params.selection
    const isBlurred = editorSession.isBlurred()
    const commandState = {
      disabled: false
    }
    if (sel.isPropertySelection() && !isBlurred) {
      const path = sel.getPath()
      const node = doc.get(path[0])
      if (node && node.isText()) {
        commandState.active = isMatch(node, this.config.spec)
      } else {
        commandState.disabled = true
      }
    } else {
      // TODO: Allow Container Selections too, to switch multiple paragraphs
      commandState.disabled = true
    }
    return commandState
  }

  /**
    Perform a switchTextType transformation based on the current selection
  */
  execute (params) {
    const editorSession = params.editorSession
    editorSession.transaction((tx) => {
      return tx.switchTextType(this.config.spec)
    })
  }

  isSwitchTypeCommand () {
    return true
  }
}