py-gtk-notes/inject.js

/**
 * {注入的js}
 * @author yutent<yutent.io@gmail.com>
 * @date 2023/07/21 17:38:11
 */
const MIME_TYPES = {
  html: 'text/html',
  json: 'application/json',
  js: 'application/javascript',
  htm: 'text/html',
  txt: 'text/plain',
  css: 'text/css',
  webp: 'image/webp',
  jpg: 'image/jpg',
  jpeg: 'image/jpeg',
  png: 'image/png',
  gif: 'image/gif',
  svg: 'image/svg+xml',
  ico: 'image/ico',
  mp3: 'audio/mpeg',
  ogg: 'audio/ogg',
  m4a: 'audio/m4a',
  amr: 'audio/amr',
  mp4: 'video/mp4',
  webm: 'video/webm',
  wasm: 'application/wasm',
  asm: 'application/asm',
  zip: 'application/zip',
  '7z': 'application/x-7z-compressed',
  eot: 'application/vnd.ms-fontobject',
  ttf: 'font/ttf',
  otf: 'font/otf',
  woff: 'font/woff',
  woff2: 'font/woff2',
  xls: 'application/vnd.ms-excel',
  doc: 'application/msword',
  xlsx: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
  docx: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document'
}

function defer() {
  let obj = {}
  obj.promise = new Promise((resolve, reject) => {
    obj.resolve = resolve
    obj.reject = reject
  })
  return obj
}

function rand(prefix = 'cb_') {
  return prefix + Math.random().toString().slice(2)
}

function handler(event, data = {}, once = true) {
  let _ = defer()
  let callback

  if (typeof once === 'boolean') {
    callback = rand()
    native[once ? '$once' : '$on'](callback, _.resolve)
  } else {
    _.resolve(true)
  }
  window.webkit.messageHandlers.app.postMessage({
    event,
    data,
    callback
  })
  return _.promise
}

class NativeImage {
  #origin

  constructor(obj) {
    this.#origin = obj
    this.width = obj.width
    this.height = obj.height
    this.type = MIME_TYPES[obj.filepath.split('.').pop()]
  }

  toPixbuf() {
    return this.#origin
  }

  export(type) {
    let _ = defer()
    let canvas = document.createElement('canvas')
    canvas.width = this.width
    canvas.height = this.height
    let ctx = canvas.getContext('2d')
    let imgData = ctx.getImageData(0, 0, this.width, this.height)
    let data = imgData.data

    for (let i = 0; i < this.#origin.bytes.length; i += 4) {
      imgData.data[i] = this.#origin.bytes[i]
      imgData.data[i + 1] = this.#origin.bytes[i + 1]
      imgData.data[i + 2] = this.#origin.bytes[i + 2]
      imgData.data[i + 3] = this.#origin.bytes[i + 3]
    }

    ctx.putImageData(imgData, 0, 0)
    canvas.toBlob(_.resolve, type || this.type, 1)

    return _.promise
  }
}

class EventEmitter {
  //
  __events__ = Object.create(null)

  $on(name, fn) {
    if (this.__events__[name]) {
      this.__events__[name].push(fn)
    } else {
      this.__events__[name] = [fn]
    }
  }

  $once(name, fn) {
    fn.__once__ = true
    this.$on(name, fn)
  }

  $off(name, fn) {
    if (this.__events__[name]) {
      if (fn) {
        this.__events__[name] = this.__events__[name].filter(it => it !== fn)
      } else {
        this.__events__[name] = []
      }
    }
  }

  $emit(name, ...args) {
    if (this.__events__[name]) {
      for (let fn of this.__events__[name]) {
        try {
          fn.apply(this, args)
          if (fn.__once__) {
            this.$off(name, fn)
          }
        } catch (e) {
          console.error(e)
        }
      }
    }
  }

  $destroy() {
    this.__events__ = Object.create(null)
  }
}

window.native = new EventEmitter()

Object.assign(native, {
  quit() {
    return handler('quit')
  },
  fs: {
    read(filepath) {}
  },
  image(filepath) {
    return handler('image', { value: filepath }).then(r => new NativeImage(r))
  },
  clipboard: {
    readText() {
      return handler('clipboard', { action: 'wait_for_text' })
    },
    writeText(value) {
      return handler('clipboard', { action: 'set_text', value }, null)
    },
    readImage() {
      return handler('clipboard', { action: 'wait_for_image' })
    },
    writeImage(value) {
      if (typeof value === 'object') {
        value = value.toPixbuf()
      }
      return handler('clipboard', { action: 'set_image', value }, null)
    },
    clear() {
      return handler('clipboard', { action: 'clear' })
    }
  },
  handler
})