react-native-surveys/Forms/api/react-dropzone/utils.js

Build your own forms, surveys and polls for your React Native apps.

import accepts from "./attr-accept"; // Firefox versions prior to 53 return a bogus MIME type for every file drag, so dragovers with
// that MIME type will always be accepted

export function fileAccepted(file, accept) {
  return file.type === "application/x-moz-file" || accepts(file, accept);
}
export function fileMatchSize(file, maxSize, minSize) {
  return file.size <= maxSize && file.size >= minSize;
}
export function allFilesAccepted(files, accept) {
  return files.every(file => fileAccepted(file, accept));
} // React's synthetic events has event.isPropagationStopped,
// but to remain compatibility with other libs (Preact) fall back
// to check event.cancelBubble

export function isPropagationStopped(event) {
  if (typeof event.isPropagationStopped === "function") {
    return event.isPropagationStopped();
  } else if (typeof event.cancelBubble !== "undefined") {
    return event.cancelBubble;
  }

  return false;
}
export function isEvtWithFiles(event) {
  if (!event.dataTransfer) {
    return !!event.target && !!event.target.files;
  } // https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer/types
  // https://developer.mozilla.org/en-US/docs/Web/API/HTML_Drag_and_Drop_API/Recommended_drag_types#file

  return Array.prototype.some.call(
    event.dataTransfer.types,
    type => type === "Files" || type === "application/x-moz-file"
  );
}
export function isKindFile(item) {
  return typeof item === "object" && item !== null && item.kind === "file";
} // allow the entire document to be a drag target

export function onDocumentDragOver(event) {
  event.preventDefault();
}

function isIe(userAgent) {
  return (
    userAgent.indexOf("MSIE") !== -1 || userAgent.indexOf("Trident/") !== -1
  );
}

function isEdge(userAgent) {
  return userAgent.indexOf("Edge/") !== -1;
}

export function isIeOrEdge(userAgent = window.navigator.userAgent) {
  return isIe(userAgent) || isEdge(userAgent);
}
/**
 * This is intended to be used to compose event handlers
 * They are executed in order until one of them calls `event.isPropagationStopped()`.
 * Note that the check is done on the first invoke too,
 * meaning that if propagation was stopped before invoking the fns,
 * no handlers will be executed.
 *
 * @param {Function} fns the event hanlder functions
 * @return {Function} the event handler to add to an element
 */

export function composeEventHandlers(...fns) {
  return (event, ...args) =>
    fns.some(fn => {
      if (!isPropagationStopped(event) && fn) {
        fn(event, ...args);
      }

      return isPropagationStopped(event);
    });
}