messagewindow.js

现在很火的邮件客户端软件thunderbird的源码

# -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is Mozilla Communicator client code, released
# March 31, 1998.
#
# The Initial Developer of the Original Code is
# Netscape Communications Corporation.
# Portions created by the Initial Developer are Copyright (C) 1998-1999
# the Initial Developer. All Rights Reserved.
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# Contributor(s):
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# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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/* This is where functions related to the standalone message window are kept */

// from MailNewsTypes.h
const nsMsgKey_None = 0xFFFFFFFF;
const nsMsgViewIndex_None = 0xFFFFFFFF;

/* globals for a particular window */

var compositeDataSourceContractID        = datasourceContractIDPrefix + "composite-datasource";

var gCompositeDataSource;
var gCurrentMessageUri;
var gCurrentFolderUri;
var gThreadPaneCommandUpdater = null;
var gCurrentMessageIsDeleted = false;
var gNextMessageViewIndexAfterDelete = -2;
var gCurrentFolderToRerootForStandAlone;
var gRerootOnFolderLoadForStandAlone = false;
var gNextMessageAfterLoad = null;

// the folderListener object
var folderListener = {
  OnItemAdded: function(parentItem, item) {},

  OnItemRemoved: function(parentItem, item) {
    if (parentItem.Value != gCurrentFolderUri)
      return;

    if (item instanceof Components.interfaces.nsIMsgDBHdr &&
        extractMsgKeyFromURI() == item.messageKey)
      gCurrentMessageIsDeleted = true;
  },

  OnItemPropertyChanged: function(item, property, oldValue, newValue) {},
  OnItemIntPropertyChanged: function(item, property, oldValue, newValue) { 
    if (item.Value == gCurrentFolderUri) {
      if (property.toString() == "TotalMessages" || property.toString() == "TotalUnreadMessages") {
        UpdateStandAloneMessageCounts();
      }      
    }
  },
  OnItemBoolPropertyChanged: function(item, property, oldValue, newValue) {},
  OnItemUnicharPropertyChanged: function(item, property, oldValue, newValue){},
  OnItemPropertyFlagChanged: function(item, property, oldFlag, newFlag) {},

  OnItemEvent: function(folder, event) {
    var eventType = event.toString();

    if (eventType == "DeleteOrMoveMsgCompleted")
      HandleDeleteOrMoveMsgCompleted(folder);
    else if (eventType == "DeleteOrMoveMsgFailed")
      HandleDeleteOrMoveMsgFailed(folder);
    else if (eventType == "FolderLoaded") {
      if (folder) {
        var uri = folder.URI;
        if (uri == gCurrentFolderToRerootForStandAlone) {
          gCurrentFolderToRerootForStandAlone = null;
          var msgFolder = folder.QueryInterface(Components.interfaces.nsIMsgFolder);
          if (msgFolder) {
            msgFolder.endFolderLoading();
            if (gRerootOnFolderLoadForStandAlone) {
              RerootFolderForStandAlone(uri);
            }
          }   
        }
      }
    }
    else if (eventType == "JunkStatusChanged") {
      HandleJunkStatusChanged(folder);
    }
  }   
}

var messagepaneObserver = {

  canHandleMultipleItems: false,

  onDrop: function (aEvent, aData, aDragSession)
  {
    var sourceUri = aData.data; 
    if (sourceUri != gCurrentMessageUri)
    {
      SelectFolder(GetMsgHdrFromUri(sourceUri).folder.URI);
      SelectMessage(sourceUri);
    }
  },
 
  onDragOver: function (aEvent, aFlavour, aDragSession)
  {
    var messagepanebox = document.getElementById("messagepanebox");
    messagepanebox.setAttribute("dragover", "true");
  },
 
  onDragExit: function (aEvent, aDragSession)
  {
    var messagepanebox = document.getElementById("messagepanebox");
    messagepanebox.removeAttribute("dragover");
  },

  canDrop: function(aEvent, aDragSession)  //allow drop from mail:3pane window only - 4xp
  {
    var doc = aDragSession.sourceNode.ownerDocument;
    var elem = doc.getElementById("messengerWindow");
    return (elem && (elem.getAttribute("windowtype") == "mail:3pane"));
  },
  
  getSupportedFlavours: function ()
  {
    var flavourSet = new FlavourSet();
    flavourSet.appendFlavour("text/x-moz-message");
    return flavourSet;
  }
};

function nsMsgDBViewCommandUpdater()
{}

function UpdateStandAloneMessageCounts()
{
  // hook for extra toolbar items
  var observerService = Components.classes["@mozilla.org/observer-service;1"].getService(Components.interfaces.nsIObserverService);
  observerService.notifyObservers(window, "mail:updateStandAloneMessageCounts", "");
}

nsMsgDBViewCommandUpdater.prototype = 
{
  updateCommandStatus : function()
    {
      // the back end is smart and is only telling us to update command status
      // when the # of items in the selection has actually changed.
      UpdateMailToolbar("dbview, std alone window");
    },

  displayMessageChanged : function(aFolder, aSubject, aKeywords)
  {
    setTitleFromFolder(aFolder, aSubject);
    ClearPendingReadTimer(); // we are loading / selecting a new message so kill the mark as read timer for the currently viewed message
    gCurrentMessageUri = gDBView.URIForFirstSelectedMessage;
    UpdateStandAloneMessageCounts();
    goUpdateCommand("button_junk");
    goUpdateCommand("button_goBack");
    goUpdateCommand("button_goForward");
  },

  updateNextMessageAfterDelete : function()
  {
    SetNextMessageAfterDelete();
  },

  QueryInterface : function(iid)
  {
    if (iid.equals(Components.interfaces.nsIMsgDBViewCommandUpdater) ||
        iid.equals(Components.interfaces.nsISupports))
      return this;
	  
    throw Components.results.NS_NOINTERFACE;
  }
}

function HandleDeleteOrMoveMsgCompleted(folder)
{
	var folderResource = folder.QueryInterface(Components.interfaces.nsIRDFResource);
	if (!folderResource)
		return;

	if ((folderResource.Value == gCurrentFolderUri) && gCurrentMessageIsDeleted)
	{
    gDBView.onDeleteCompleted(true);
    gCurrentMessageIsDeleted = false;
    if (gNextMessageViewIndexAfterDelete != nsMsgViewIndex_None) 
    {
      var nextMstKey = gDBView.getKeyAt(gNextMessageViewIndexAfterDelete);
      if (nextMstKey != nsMsgKey_None) {
        LoadMessageByViewIndex(gNextMessageViewIndexAfterDelete);
      }
      else {
        window.close();
      }
    }
    else
    {
      // close the stand alone window because there are no more messages in the folder
      window.close();
    }
	}
}

function HandleDeleteOrMoveMsgFailed(folder)
{
  var folderResource = folder.QueryInterface(Components.interfaces.nsIRDFResource);
  if (!folderResource)
     return;

  gDBView.onDeleteCompleted(false);
  if ((folderResource.Value == gCurrentFolderUri) && gCurrentMessageIsDeleted)
    gCurrentMessageIsDeleted = false;
}

function IsCurrentLoadedFolder(folder)
{
  var folderResource = folder.QueryInterface(Components.interfaces.nsIRDFResource);
  if (!folderResource)
     return false;

  return (folderResource.Value == gCurrentFolderUri);
}


// we won't show the window until the onload() handler is finished
// so we do this trick (suggested by hyatt / blaker)
function OnLoadMessageWindow()
{
  setTimeout(delayedOnLoadMessageWindow, 0); // when debugging, set this to 5000, so you can see what happens after the window comes up.
}

function delayedOnLoadMessageWindow()
{
  HideMenus();
  HideToolbarButtons();
  ShowMenus();
  MailOfflineMgr.init();
  CreateMailWindowGlobals();
  CreateMessageWindowGlobals();
  verifyAccounts(null);

  InitMsgWindow();

  messenger.SetWindow(window, msgWindow);
  InitializeDataSources();
  // FIX ME - later we will be able to use onload from the overlay
  OnLoadMsgHeaderPane();

  try {
    var nsIFolderListener = Components.interfaces.nsIFolderListener;
    var notifyFlags = nsIFolderListener.removed | nsIFolderListener.event | nsIFolderListener.intPropertyChanged;
    mailSession.AddFolderListener(folderListener, notifyFlags);
  } catch (ex) {
    dump("Error adding to session: " +ex + "\n");
  }

  var originalView = null;
  var folder = null;
  var messageUri;
  var loadCustomMessage = false;       //set to true when either loading a message/rfc822 attachment or a .eml file
  if (window.arguments)
  {
    if (window.arguments[0])
    {
      try
      {
        messageUri = window.arguments[0];
        if (messageUri instanceof Components.interfaces.nsIURI)
        {
          loadCustomMessage = /type=application\/x-message-display/.test(messageUri.spec);
          gCurrentMessageUri = messageUri.spec;
          if (messageUri instanceof Components.interfaces.nsIMsgMailNewsUrl)
            folder = messageUri.folder;
        }
      } 
      catch(ex) 
      {
        folder = null;
        dump("## ex=" + ex + "\n");
      }

      if (!gCurrentMessageUri)
        gCurrentMessageUri = window.arguments[0];
    }
    else
      gCurrentMessageUri = null;

    if (window.arguments[1])
      gCurrentFolderUri = window.arguments[1];
    else
      gCurrentFolderUri = folder ? folder.URI : null;

    if (window.arguments[2])
      originalView = window.arguments[2];      

  }	

  CreateView(originalView);
  
  gFindBar.initFindBar();
  gPhishingDetector.init();
  
  // initialize the customizeDone method on the customizeable toolbar
  var toolbox = document.getElementById("mail-toolbox");
  toolbox.customizeDone = MailToolboxCustomizeDone;

  var toolbarset = document.getElementById('customToolbars');
  toolbox.toolbarset = toolbarset;

  setTimeout(OnLoadMessageWindowDelayed, 0, loadCustomMessage);
  
  SetupCommandUpdateHandlers();
}

function OnLoadMessageWindowDelayed(loadCustomMessage)
{
  if (loadCustomMessage)
  {
    gDBView.suppressMsgDisplay = false;
    gDBView.loadMessageByUrl(gCurrentMessageUri);
  }
  else
  {
    var msgKey = extractMsgKeyFromURI(gCurrentMessageUri); 
    LoadMessageByViewIndex(gDBView.findIndexFromKey(msgKey, true));
  }
  gNextMessageViewIndexAfterDelete = gDBView.msgToSelectAfterDelete; 
  UpdateStandAloneMessageCounts();
   
  // set focus to the message pane
  window.content.focus();

  // since we just changed the pane with focus we need to update the toolbar to reflect this
  // XXX TODO
  // can we optimize
  // and just update cmd_delete and button_delete?
  UpdateMailToolbar("focus");
}

function CreateView(originalView)
{
  var msgFolder = GetLoadedMsgFolder();

  // extract the sort type, the sort order, 
  var sortType;
  var sortOrder;
  var viewFlags;
  var viewType;

  if (originalView)
  {
    viewType = originalView.viewType;
    viewFlags = originalView.viewFlags;
    sortType = originalView.sortType;
    sortOrder = originalView.sortOrder;
  }
  else if (msgFolder)
  {
    var msgDatabase = msgFolder.getMsgDatabase(msgWindow);
    if (msgDatabase)
    {
      var dbFolderInfo = msgDatabase.dBFolderInfo;
      sortType = dbFolderInfo.sortType;
      sortOrder = dbFolderInfo.sortOrder;
      viewFlags = dbFolderInfo.viewFlags;
      viewType = dbFolderInfo.viewType;
      msgDatabase = null;
      dbFolderInfo = null;
   }
  }
  else
  {
    // this is a hack to make opening a stand-alone msg window on a 
    // .eml file work. We use a search view since its much more tolerant
    // of not having a folder.