[Chromoting] Move shared webapp JS files from crd/js -> base/js

remoting/webapp/crd/js/clipboard.js

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-/**
- * @fileoverview
- * A class for moving clipboard items between the plugin and the OS.
- */
-
-/** @suppress {duplicate} */
-var remoting = remoting || {};
-
-(function() {
-
-'use strict';
-
-/**
- * @private
- * @enum {string}
- */
-var ItemTypes = {
-  TEXT_TYPE: 'text/plain',
-  TEXT_UTF8_TYPE: 'text/plain; charset=UTF-8'
-};
-
-/**
- * @constructor
- * @param {remoting.ClientPlugin} plugin
- * @implements {base.Disposable}
- */
-remoting.Clipboard = function(plugin) {
-  /** @private {string} */
-  this.previousContent_ = '';
-
-  /** @private {boolean} */
-  this.itemFromHostTextPending_ = false;
-
-  /** @private {boolean} */
-  this.blockOneClipboardSend_ = true;
-
-  /** @private */
-  this.plugin_ = plugin;
-
-  /** @private */
-  this.eventHooks_ = new base.Disposables(
-      new base.DomEventHook(plugin.element(), 'focus',
-                            this.initiateToHost_.bind(this), false),
-      new base.DomEventHook(window, 'paste', this.onPaste_.bind(this), false),
-      new base.DomEventHook(window, 'copy', this.onCopy_.bind(this), false));
-
-  // Do a paste operation, but make sure the resulting clipboard data isn't sent
-  // to the host. This stops the host seeing items that were placed on the
-  // clipboard before the session began. The user may not have intended such
-  // items to be sent to the host.
-  this.initiateToHost_();
-  this.plugin_.setClipboardHandler(this.fromHost_.bind(this));
-};
-
-remoting.Clipboard.prototype.dispose = function() {
-  this.plugin_.setClipboardHandler(base.doNothing);
-  this.plugin_ = null;
-  base.dispose(this.eventHooks_);
-  this.eventHooks_ = null;
-};
-
-/**
- * Accepts a clipboard from the OS, and sends any changed clipboard items to
- * the host.
- *
- * Currently only text items are supported.
- *
- * @param {ClipboardData} clipboardData
- * @return {void} Nothing.
- * @private
- */
-remoting.Clipboard.prototype.toHost_ = function(clipboardData) {
-  if (!clipboardData || !clipboardData.types || !clipboardData.getData) {
-    console.log('Got invalid clipboardData.');
-    return;
-  }
-  for (var i = 0; i < clipboardData.types.length; i++) {
-    var type = clipboardData.types[i];
-    var item = clipboardData.getData(type);
-    if (!item) {
-      item = '';
-    }
-    console.log('Got clipboard from OS, type: ' + type +
-                ' length: ' + item.length + ' new: ' +
-                (item != this.previousContent_) + ' blocking-send: ' +
-                this.blockOneClipboardSend_);
-    // The browser presents text clipboard items as 'text/plain'.
-    if (type == ItemTypes.TEXT_TYPE) {
-      // Don't send the same item more than once. Otherwise the item may be
-      // sent to and fro indefinitely.
-      if (item != this.previousContent_) {
-        if (!this.blockOneClipboardSend_) {
-          // The plugin's JSON reader emits UTF-8.
-          console.log('Sending clipboard to host.');
-          this.plugin_.sendClipboardItem(ItemTypes.TEXT_UTF8_TYPE, item);
-        }
-        this.previousContent_ = item;
-      }
-    }
-  }
-  this.blockOneClipboardSend_ = false;
-};
-
-/**
- * Accepts a clipboard item from the host, and stores it so that toOs() will
- * subsequently send it to the OS clipboard.
- *
- * @param {string} mimeType The MIME type of the clipboard item.
- * @param {string} item The clipboard item.
- * @return {void} Nothing.
- */
-remoting.Clipboard.prototype.fromHost_ = function(mimeType, item) {
-  // The plugin's JSON layer will correctly convert only UTF-8 data sent from
-  // the host.
-  console.log('Got clipboard from host, type: ' + mimeType +
-              ' length: ' + item.length + ' new: ' +
-              (item != this.previousContent_));
-  if (mimeType != ItemTypes.TEXT_UTF8_TYPE) {
-    return;
-  }
-  if (item == this.previousContent_) {
-    return;
-  }
-  this.previousContent_ = item;
-  this.itemFromHostTextPending_ = true;
-  this.initiateToOs_();
-};
-
-/**
- * Moves any pending clipboard items to a ClipboardData object.
- *
- * @param {ClipboardData} clipboardData
- * @return {boolean} Whether any clipboard items were moved to the ClipboardData
- *     object.
- * @private
- */
-remoting.Clipboard.prototype.toOs_ = function(clipboardData) {
-  if (!this.itemFromHostTextPending_) {
-    console.log('Got unexpected clipboard copy event.');
-    return false;
-  }
-  // The JSON layer between the plugin and this webapp converts UTF-8 to the
-  // JS string encoding. The browser will convert JS strings to the correct
-  // encoding, per OS and locale conventions, provided the data type is
-  // 'text/plain'.
-  console.log('Setting OS clipboard, length: ' + this.previousContent_.length);
-  clipboardData.setData(ItemTypes.TEXT_TYPE, this.previousContent_);
-  this.itemFromHostTextPending_ = false;
-  return true;
-};
-
-/**
- * Initiates the process of sending any fresh items on the OS clipboard, to the
- * host.
- *
- * This method makes the browser fire a paste event, which provides access to
- * the OS clipboard. That event will be caught by a handler in the document,
- * which will call toHost().
- * @private
- */
-remoting.Clipboard.prototype.initiateToHost_ = function() {
-  // It would be cleaner to send a paste command to the plugin element,
-  // but that's not supported.
-  //console.log('Initiating clipboard paste.');
-  document.execCommand('paste');
-};
-
-/**
- * Initiates the process of sending any items freshly received from the host,
- * to the OS clipboard.
- *
- * This method makes the browser fire a copy event, which provides access to
- * the OS clipboard. That event will be caught by a handler in the document,
- * which will call toOs().
- * @private
- */
-remoting.Clipboard.prototype.initiateToOs_ = function() {
-  // It would be cleaner to send a paste command to the plugin element,
-  // but that's not supported.
-  console.log('Initiating clipboard copy.');
-  document.execCommand('copy');
-};
-
-/**
- * Callback function called when the browser window gets a paste operation.
- *
- * @param {Event} event
- * @return {void} Nothing.
- * @private
- */
-remoting.Clipboard.prototype.onPaste_ = function(event) {
-  if (event && event.clipboardData) {
-    this.toHost_(event.clipboardData);
-  }
-};
-
-/**
- * Callback function called when the browser window gets a copy operation.
- *
- * @param {Event} event
- * @return {void} Nothing.
- * @private
- */
-remoting.Clipboard.prototype.onCopy_ = function(event) {
-  if (event && event.clipboardData && this.toOs_(event.clipboardData)) {
-    // The default action may overwrite items that we added to clipboardData.
-    event.preventDefault();
-  }
-};
-
-})();