Issue #1258 - Part 1: Import mailnews, ldap, and mork from comm-esr52.9.1

1 files changed, 741 insertions, 0 deletions

diff --git a/mailnews/base/src/nsMsgPrintEngine.cpp b/mailnews/base/src/nsMsgPrintEngine.cpp
new file mode 100644
index 000000000..d2f8157ed
--- /dev/null
+++ b/mailnews/base/src/nsMsgPrintEngine.cpp
@@ -0,0 +1,741 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/**
+ * nsMsgPrintEngine.cpp provides a DocShell container for use in printing.
+ */
+
+#include "nscore.h"
+#include "nsCOMPtr.h"
+
+#include "nsIComponentManager.h"
+
+#include "nsISupports.h"
+
+#include "nsIURI.h"
+
+#include "nsPIDOMWindow.h"
+#include "mozIDOMWindow.h"
+#include "nsIContentViewer.h"
+#include "nsIMsgMessageService.h"
+#include "nsMsgUtils.h"
+#include "nsIWebProgress.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsMsgPrintEngine.h"
+#include "nsIDocumentLoader.h"
+#include "nsIPrefService.h"
+#include "nsIPrefBranch.h"
+#include "nsThreadUtils.h"
+#include "nsAutoPtr.h"
+#include "mozilla/Services.h"
+
+// Interfaces Needed
+#include "nsIBaseWindow.h"
+#include "nsIDocShellTreeOwner.h"
+#include "nsIDocShellTreeItem.h"
+#include "nsIWebNavigation.h"
+#include "nsIChannel.h"
+#include "nsIContentViewerFile.h"
+#include "nsServiceManagerUtils.h"
+
+static const char* kPrintingPromptService = "@mozilla.org/embedcomp/printingprompt-service;1";
+
+/////////////////////////////////////////////////////////////////////////
+// nsMsgPrintEngine implementation
+/////////////////////////////////////////////////////////////////////////
+
+nsMsgPrintEngine::nsMsgPrintEngine() :
+  mIsDoingPrintPreview(false),
+  mMsgInx(nsIMsgPrintEngine::MNAB_START)
+{
+  mCurrentlyPrintingURI = -1;
+}
+
+
+nsMsgPrintEngine::~nsMsgPrintEngine()
+{
+}
+
+// Implement AddRef and Release
+NS_IMPL_ISUPPORTS(nsMsgPrintEngine,
+                         nsIMsgPrintEngine, 
+                         nsIWebProgressListener, 
+                         nsIObserver,
+                         nsISupportsWeakReference)
+
+// nsIWebProgressListener implementation
+NS_IMETHODIMP
+nsMsgPrintEngine::OnStateChange(nsIWebProgress* aWebProgress, 
+                   nsIRequest *aRequest, 
+                   uint32_t progressStateFlags, 
+                   nsresult aStatus)
+{
+  nsresult rv = NS_OK;
+
+  // top-level document load data
+  if (progressStateFlags & nsIWebProgressListener::STATE_IS_DOCUMENT) {
+    if (progressStateFlags & nsIWebProgressListener::STATE_START) {
+      // Tell the user we are loading...
+      nsString msg;
+      GetString(u"LoadingMessageToPrint", msg);
+      SetStatusMessage(msg);
+    }
+
+    if (progressStateFlags & nsIWebProgressListener::STATE_STOP) {
+      nsCOMPtr<nsIDocumentLoader> docLoader(do_QueryInterface(aWebProgress));
+      if (docLoader) 
+      {
+        // Check to see if the document DOMWin that is finished loading is the same
+        // one as the mail msg that we started to load.
+        // We only want to print when the entire msg and all of its attachments
+        // have finished loading.
+        // The mail msg doc is the last one to receive the STATE_STOP notification
+        nsCOMPtr<nsISupports> container;
+        docLoader->GetContainer(getter_AddRefs(container));
+        nsCOMPtr<mozIDOMWindowProxy> domWindow(do_GetInterface(container));
+        if (domWindow.get() != mMsgDOMWin.get()) {
+          return NS_OK;
+        }
+      }
+      nsCOMPtr<nsIWebProgressListener> wpl(do_QueryInterface(mPrintPromptService));
+      if (wpl) {
+        wpl->OnStateChange(nullptr, nullptr, nsIWebProgressListener::STATE_STOP|nsIWebProgressListener::STATE_IS_DOCUMENT, NS_OK);
+        mPrintProgressListener = nullptr;
+        mPrintProgress         = nullptr;
+        mPrintProgressParams   = nullptr;
+      }
+
+      bool isPrintingCancelled = false;
+      if (mPrintSettings)
+      {
+        mPrintSettings->GetIsCancelled(&isPrintingCancelled);
+      }
+      if (!isPrintingCancelled) {
+        // if aWebProgress is a documentloader than the notification from
+        // loading the documents. If it is NULL (or not a DocLoader) then it 
+        // it coming from Printing
+        if (docLoader) {
+          // Now, fire off the print operation!
+          rv = NS_ERROR_FAILURE;
+
+          // Tell the user the message is loaded...
+          nsString msg;
+          GetString(u"MessageLoaded", msg);
+          SetStatusMessage(msg);
+
+          NS_ASSERTION(mDocShell,"can't print, there is no docshell");
+          if ( (!mDocShell) || (!aRequest) ) 
+          {
+            return StartNextPrintOperation();
+          }
+          nsCOMPtr<nsIChannel> aChannel = do_QueryInterface(aRequest);
+          if (!aChannel) return NS_ERROR_FAILURE;
+
+          // Make sure this isn't just "about:blank" finishing....
+          nsCOMPtr<nsIURI> originalURI = nullptr;
+          if (NS_SUCCEEDED(aChannel->GetOriginalURI(getter_AddRefs(originalURI))) && originalURI)
+          {
+            nsAutoCString spec;
+
+            if (NS_SUCCEEDED(originalURI->GetSpec(spec)))
+            {      
+              if (spec.Equals("about:blank"))
+              {
+                return StartNextPrintOperation();
+              }
+            }
+          }
+
+          // If something bad happens here (menaing we can fire the PLEvent, highly unlikely)
+          // we will still ask the msg to print, but if the user "cancels" out of the 
+          // print dialog the hidden print window will not be "closed"
+          if (!FirePrintEvent()) 
+          {
+            PrintMsgWindow();
+          }
+        } else {
+          FireStartNextEvent();
+          rv = NS_OK;
+        }
+      } 
+      else 
+      {
+        if (mWindow) {
+          nsPIDOMWindowOuter::From(mWindow)->Close();
+        }
+      }
+    }
+  }
+
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgPrintEngine::OnProgressChange(nsIWebProgress *aWebProgress,
+                                     nsIRequest *aRequest,
+                                     int32_t aCurSelfProgress,
+                                     int32_t aMaxSelfProgress,
+                                     int32_t aCurTotalProgress,
+                                     int32_t aMaxTotalProgress)
+{
+    return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgPrintEngine::OnLocationChange(nsIWebProgress* aWebProgress,
+                      nsIRequest* aRequest,
+                      nsIURI *location,
+                      uint32_t aFlags)
+{
+    NS_NOTREACHED("notification excluded in AddProgressListener(...)");
+    return NS_OK;
+}
+
+
+NS_IMETHODIMP
+nsMsgPrintEngine::OnStatusChange(nsIWebProgress* aWebProgress,
+                    nsIRequest* aRequest,
+                    nsresult aStatus,
+                    const char16_t* aMessage)
+{
+    return NS_OK;
+}
+
+
+NS_IMETHODIMP
+nsMsgPrintEngine::OnSecurityChange(nsIWebProgress *aWebProgress, 
+                      nsIRequest *aRequest, 
+                      uint32_t state)
+{
+    NS_NOTREACHED("notification excluded in AddProgressListener(...)");
+    return NS_OK;
+}
+
+NS_IMETHODIMP    
+nsMsgPrintEngine::SetWindow(mozIDOMWindowProxy *aWin)
+{
+  if (!aWin)
+  {
+    // It isn't an error to pass in null for aWin, in fact it means we are shutting
+    // down and we should start cleaning things up...
+    return NS_OK;
+  }
+
+  mWindow = aWin;
+
+  NS_ENSURE_TRUE(mWindow, NS_ERROR_FAILURE);
+  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(mWindow);
+
+  window->GetDocShell()->SetAppType(nsIDocShell::APP_TYPE_MAIL);
+
+  nsCOMPtr<nsIDocShellTreeItem> docShellAsItem =
+    do_QueryInterface(window->GetDocShell());
+  NS_ENSURE_TRUE(docShellAsItem, NS_ERROR_FAILURE);
+
+  nsCOMPtr<nsIDocShellTreeItem> rootAsItem;
+  docShellAsItem->GetSameTypeRootTreeItem(getter_AddRefs(rootAsItem));
+
+  nsCOMPtr<nsIDocShellTreeItem> childItem;
+  rootAsItem->FindChildWithName(NS_LITERAL_STRING("content"), true,
+				false, nullptr, nullptr,
+				getter_AddRefs(childItem));
+
+  mDocShell = do_QueryInterface(childItem);
+
+  if(mDocShell)
+    SetupObserver();
+
+  return NS_OK;
+}
+
+/* void setParentWindow (in mozIDOMWindowProxy ptr); */
+NS_IMETHODIMP nsMsgPrintEngine::SetParentWindow(mozIDOMWindowProxy *ptr)
+{
+  mParentWindow = ptr;
+  return NS_OK;
+}
+
+
+NS_IMETHODIMP
+nsMsgPrintEngine::ShowWindow(bool aShow)
+{
+  nsresult rv;
+
+  NS_ENSURE_TRUE(mWindow, NS_ERROR_NOT_INITIALIZED);
+
+  nsCOMPtr<nsPIDOMWindowOuter> window = nsPIDOMWindowOuter::From(mWindow);
+  nsCOMPtr <nsIDocShellTreeItem> treeItem =
+    do_QueryInterface(window->GetDocShell(), &rv);
+  NS_ENSURE_SUCCESS(rv,rv);
+
+  nsCOMPtr <nsIDocShellTreeOwner> treeOwner;
+  rv = treeItem->GetTreeOwner(getter_AddRefs(treeOwner));
+  NS_ENSURE_SUCCESS(rv,rv);
+  
+  if (treeOwner) {
+    // disable (enable) the window
+    nsCOMPtr<nsIBaseWindow> baseWindow;
+    baseWindow = do_QueryInterface(treeOwner, &rv);
+    NS_ENSURE_SUCCESS(rv,rv);
+
+    rv = baseWindow->SetEnabled(aShow);
+    NS_ENSURE_SUCCESS(rv,rv);
+
+    // hide or show the window
+    baseWindow->SetVisibility(aShow);
+  }
+  return rv;
+}
+
+NS_IMETHODIMP
+nsMsgPrintEngine::AddPrintURI(const char16_t *aMsgURI)
+{
+  NS_ENSURE_ARG_POINTER(aMsgURI);
+
+  mURIArray.AppendElement(nsDependentString(aMsgURI));
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgPrintEngine::SetPrintURICount(int32_t aCount)
+{
+  mURICount = aCount;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsMsgPrintEngine::StartPrintOperation(nsIPrintSettings* aPS)
+{
+  NS_ENSURE_ARG_POINTER(aPS);
+  mPrintSettings = aPS;
+
+  // Load the about:blank on the tail end...
+  nsresult rv = AddPrintURI(u"about:blank"); 
+  if (NS_FAILED(rv)) return rv; 
+  return StartNextPrintOperation();
+}
+
+//----------------------------------------------------------------------
+// Set up to use the "pluggable" Print Progress Dialog
+nsresult
+nsMsgPrintEngine::ShowProgressDialog(bool aIsForPrinting, bool& aDoNotify)
+{
+  nsresult rv;
+
+  // default to not notifying, that if something here goes wrong
+  // or we aren't going to show the progress dialog we can straight into 
+  // reflowing the doc for printing.
+  aDoNotify = false;
+
+  // Assume we can't do progress and then see if we can
+  bool showProgressDialog = false;
+
+  // if it is already being shown then don't bother to find out if it should be
+  // so skip this and leave mShowProgressDialog set to FALSE
+  nsCOMPtr<nsIPrefBranch> prefBranch = do_GetService(NS_PREFSERVICE_CONTRACTID, &rv);
+  if (NS_SUCCEEDED(rv)) 
+  {
+    prefBranch->GetBoolPref("print.show_print_progress", &showProgressDialog);
+  }
+
+  // Turning off the showing of Print Progress in Prefs overrides
+  // whether the calling PS desire to have it on or off, so only check PS if 
+  // prefs says it's ok to be on.
+  if (showProgressDialog) 
+  {
+    mPrintSettings->GetShowPrintProgress(&showProgressDialog);
+  }
+
+  // Now open the service to get the progress dialog
+  // If we don't get a service, that's ok, then just don't show progress
+  if (showProgressDialog) {
+    if (!mPrintPromptService) 
+    {
+      mPrintPromptService = do_GetService(kPrintingPromptService);
+    }
+    if (mPrintPromptService) 
+    {
+      nsCOMPtr<mozIDOMWindowProxy> domWin(do_QueryInterface(mParentWindow));
+      if (!domWin) 
+      {
+        domWin = mWindow;
+      }
+
+      rv = mPrintPromptService->ShowProgress(domWin, mWebBrowserPrint, mPrintSettings, this, aIsForPrinting,
+                                            getter_AddRefs(mPrintProgressListener), 
+                                            getter_AddRefs(mPrintProgressParams), 
+                                            &aDoNotify);
+      if (NS_SUCCEEDED(rv)) {
+
+        showProgressDialog = mPrintProgressListener != nullptr && mPrintProgressParams != nullptr;
+
+        if (showProgressDialog) 
+        {
+          nsIWebProgressListener* wpl = static_cast<nsIWebProgressListener*>(mPrintProgressListener.get());
+          NS_ASSERTION(wpl, "nsIWebProgressListener is NULL!");
+          NS_ADDREF(wpl);
+          nsString msg;
+          if (mIsDoingPrintPreview) {
+            GetString(u"LoadingMailMsgForPrintPreview", msg);
+          } else {
+            GetString(u"LoadingMailMsgForPrint", msg);
+          }
+          if (!msg.IsEmpty()) 
+            mPrintProgressParams->SetDocTitle(msg.get());
+        }
+      }
+    }
+  }
+  return rv;
+}
+
+
+NS_IMETHODIMP
+nsMsgPrintEngine::StartNextPrintOperation()
+{
+  nsresult      rv;
+
+  // Only do this the first time through...
+  if (mCurrentlyPrintingURI == -1)
+    InitializeDisplayCharset();
+
+  mCurrentlyPrintingURI++;
+
+  // First, check if we are at the end of this stuff!
+  if (mCurrentlyPrintingURI >= (int32_t)mURIArray.Length())
+  {
+    // This is the end...dum, dum, dum....my only friend...the end
+    NS_ENSURE_TRUE(mWindow, NS_ERROR_FAILURE);
+    nsPIDOMWindowOuter::From(mWindow)->Close();
+
+    // Tell the user we are done...
+    nsString msg;
+    GetString(u"PrintingComplete", msg);
+    SetStatusMessage(msg);
+    return NS_OK;
+  }
+
+  if (!mDocShell)
+    return StartNextPrintOperation();
+
+  const nsString &uri = mURIArray[mCurrentlyPrintingURI];
+  rv = FireThatLoadOperationStartup(uri);
+  if (NS_FAILED(rv))
+    return StartNextPrintOperation();
+  else
+    return rv;
+}
+
+NS_IMETHODIMP    
+nsMsgPrintEngine::SetStatusFeedback(nsIMsgStatusFeedback *aFeedback)
+{
+	mFeedback = aFeedback;
+	return NS_OK;
+}
+
+#define DATA_URL_PREFIX     "data:"
+#define ADDBOOK_URL_PREFIX     "addbook:"
+
+nsresult
+nsMsgPrintEngine::FireThatLoadOperationStartup(const nsString& uri)
+{
+  if (!uri.IsEmpty()) 
+    mLoadURI = uri;
+  else
+    mLoadURI.Truncate();
+
+  bool     notify = false;
+  nsresult rv     = NS_ERROR_FAILURE;
+  // Don't show dialog if we are out of URLs
+  //if ( mCurrentlyPrintingURI < mURIArray.Length() && !mIsDoingPrintPreview)
+  if ( mCurrentlyPrintingURI < (int32_t)mURIArray.Length())
+    rv = ShowProgressDialog(!mIsDoingPrintPreview, notify);
+  if (NS_FAILED(rv) || !notify) 
+    return FireThatLoadOperation(uri);
+  return NS_OK;
+}
+
+nsresult
+nsMsgPrintEngine::FireThatLoadOperation(const nsString& uri)
+{
+  nsresult rv = NS_ERROR_FAILURE;
+  
+  nsCString uriCStr;
+  LossyCopyUTF16toASCII(uri, uriCStr);
+
+  nsCOMPtr <nsIMsgMessageService> messageService;
+  // if this is a data: url, skip it, because 
+  // we've already got something we can print
+  // and we know it is not a message.
+  //
+  // if this an about:blank url, skip it, because
+  // ...
+  //
+  // if this is an addbook: url, skip it, because
+  // we know that isn't a message.
+  //
+  // if this is a message part (or .eml file on disk)
+  // skip it, because we don't want to print the parent message
+  // we want to print the part.
+  // example:  imap://sspitzer@nsmail-1:143/fetch%3EUID%3E/INBOX%3E180958?part=1.1.2&type=application/x-message-display&filename=test"
+  if (!StringBeginsWith(uriCStr, NS_LITERAL_CSTRING(DATA_URL_PREFIX)) &&
+      !StringBeginsWith(uriCStr, NS_LITERAL_CSTRING(ADDBOOK_URL_PREFIX)) &&
+      !uriCStr.EqualsLiteral("about:blank") && 
+      uriCStr.Find(NS_LITERAL_CSTRING("type=application/x-message-display")) == -1) {
+    rv = GetMessageServiceFromURI(uriCStr, getter_AddRefs(messageService));
+  }
+
+  if (NS_SUCCEEDED(rv) && messageService) {
+    nsCOMPtr<nsIURI> dummyNull;
+    rv = messageService->DisplayMessageForPrinting(uriCStr.get(), mDocShell, nullptr, nullptr,
+                                                   getter_AddRefs(dummyNull));
+  }
+  //If it's not something we know about, then just load try loading it directly.
+  else
+  {
+    nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(mDocShell));
+    if (webNav)
+      rv = webNav->LoadURI(uri.get(),                        // URI string
+                           nsIWebNavigation::LOAD_FLAGS_NONE, // Load flags
+                           nullptr,                            // Referring URI
+                           nullptr,                            // Post data
+                           nullptr);                           // Extra headers
+  }
+  return rv;
+}
+
+void
+nsMsgPrintEngine::InitializeDisplayCharset()
+{
+  // libmime always converts to UTF-8 (both HTML and XML)
+  if (mDocShell) 
+  {
+    nsCOMPtr<nsIContentViewer> cv;
+    mDocShell->GetContentViewer(getter_AddRefs(cv));
+    if (cv) 
+    {
+      cv->SetForceCharacterSet(NS_LITERAL_CSTRING("UTF-8"));
+    }
+  }
+}
+
+void
+nsMsgPrintEngine::SetupObserver()
+{
+  if (!mDocShell)
+    return;
+
+  if (mDocShell)
+  {
+    nsCOMPtr<nsIWebProgress> progress(do_GetInterface(mDocShell));
+    NS_ASSERTION(progress, "we were expecting a nsIWebProgress");
+    if (progress) 
+    {
+      (void) progress->AddProgressListener((nsIWebProgressListener *)this,
+                                        nsIWebProgress::NOTIFY_STATE_DOCUMENT);
+    }
+
+    // Cache a pointer to the mail message's DOMWindow 
+    // so later we know when we can print when the 
+    // document "loaded" msgs com thru via the Progress listener
+    mMsgDOMWin = do_GetInterface(mDocShell);
+  }
+}
+
+nsresult
+nsMsgPrintEngine::SetStatusMessage(const nsString& aMsgString)
+{
+  if ( (!mFeedback) || (aMsgString.IsEmpty()) )
+    return NS_OK;
+
+  mFeedback->ShowStatusString(aMsgString);
+  return NS_OK;
+}
+
+#define MESSENGER_STRING_URL       "chrome://messenger/locale/messenger.properties"
+
+void
+nsMsgPrintEngine::GetString(const char16_t *aStringName, nsString& outStr)
+{
+  outStr.Truncate();
+
+  if (!mStringBundle)
+  {
+    static const char propertyURL[] = MESSENGER_STRING_URL;
+
+    nsCOMPtr<nsIStringBundleService> sBundleService = 
+      mozilla::services::GetStringBundleService();
+    if (sBundleService)
+      sBundleService->CreateBundle(propertyURL, getter_AddRefs(mStringBundle));
+  }
+
+  if (mStringBundle)
+    mStringBundle->GetStringFromName(aStringName, getter_Copies(outStr));
+  return;
+}
+
+//-----------------------------------------------------------
+void
+nsMsgPrintEngine::PrintMsgWindow()
+{
+  const char* kMsgKeys[] = {"PrintingMessage",  "PrintPreviewMessage",
+                            "PrintingContact",  "PrintPreviewContact",
+                            "PrintingAddrBook", "PrintPreviewAddrBook"};
+
+  mDocShell->GetContentViewer(getter_AddRefs(mContentViewer));  
+  if (mContentViewer) 
+  {
+    mWebBrowserPrint = do_QueryInterface(mContentViewer);
+    if (mWebBrowserPrint) 
+    {
+      if (!mPrintSettings) 
+      {
+        mWebBrowserPrint->GetGlobalPrintSettings(getter_AddRefs(mPrintSettings));
+      }
+      
+      // fix for bug #118887 and bug #176016
+      // don't show the actual url when printing mail messages or addressbook cards.
+      // for mail, it can review the salt.  for addrbook, it's a data:// url, which
+      // means nothing to the end user.
+      // needs to be " " and not "" or nullptr, otherwise, we'll still print the url
+      mPrintSettings->SetDocURL(u" ");
+
+      nsresult rv = NS_ERROR_FAILURE;
+      if (mIsDoingPrintPreview) 
+      {
+        if (mStartupPPObs) {
+          rv = mStartupPPObs->Observe(nullptr, nullptr, nullptr);
+        }
+      } 
+      else 
+      {
+        mPrintSettings->SetPrintSilent(mCurrentlyPrintingURI != 0);
+        rv = mWebBrowserPrint->Print(mPrintSettings, (nsIWebProgressListener *)this);
+      }
+
+      if (NS_FAILED(rv))
+      {
+        mWebBrowserPrint = nullptr;
+        mContentViewer = nullptr;
+        bool isPrintingCancelled = false;
+        if (mPrintSettings)
+        {
+          mPrintSettings->GetIsCancelled(&isPrintingCancelled);
+        }
+        if (!isPrintingCancelled) 
+        {
+          StartNextPrintOperation();
+        } 
+        else 
+        {
+          if (mWindow) {
+            nsPIDOMWindowOuter::From(mWindow)->Close();
+          }
+        }
+      }
+      else
+      {
+        // Tell the user we started printing...
+        nsString msg;
+        GetString(NS_ConvertASCIItoUTF16(kMsgKeys[mMsgInx]).get(), msg);
+        SetStatusMessage(msg);
+      }
+    }
+  }
+}
+
+//---------------------------------------------------------------
+//-- Event Notification
+//---------------------------------------------------------------
+
+//---------------------------------------------------------------
+class nsPrintMsgWindowEvent : public mozilla::Runnable
+{
+public:
+  nsPrintMsgWindowEvent(nsMsgPrintEngine *mpe)
+    : mMsgPrintEngine(mpe)
+  {}
+
+  NS_IMETHOD Run()
+  {
+    if (mMsgPrintEngine) 
+      mMsgPrintEngine->PrintMsgWindow();
+    return NS_OK;
+  }
+
+private:
+  RefPtr<nsMsgPrintEngine> mMsgPrintEngine;
+};
+
+//-----------------------------------------------------------
+class nsStartNextPrintOpEvent : public mozilla::Runnable
+{
+public:
+  nsStartNextPrintOpEvent(nsMsgPrintEngine *mpe)
+    : mMsgPrintEngine(mpe)
+  {}
+
+  NS_IMETHOD Run()
+  {
+    if (mMsgPrintEngine) 
+      mMsgPrintEngine->StartNextPrintOperation();
+    return NS_OK;
+  }
+
+private:
+  RefPtr<nsMsgPrintEngine> mMsgPrintEngine;
+};
+
+//-----------------------------------------------------------
+bool
+nsMsgPrintEngine::FirePrintEvent()
+{
+  nsCOMPtr<nsIRunnable> event = new nsPrintMsgWindowEvent(this);
+  return NS_SUCCEEDED(NS_DispatchToCurrentThread(event));
+}
+
+//-----------------------------------------------------------
+nsresult
+nsMsgPrintEngine::FireStartNextEvent()
+{
+  nsCOMPtr<nsIRunnable> event = new nsStartNextPrintOpEvent(this);
+  return NS_DispatchToCurrentThread(event);
+}
+
+/* void setStartupPPObserver (in nsIObserver startupPPObs); */
+NS_IMETHODIMP nsMsgPrintEngine::SetStartupPPObserver(nsIObserver *startupPPObs)
+{
+  mStartupPPObs = startupPPObs;
+  return NS_OK;
+}
+
+/* attribute boolean doPrintPreview; */
+NS_IMETHODIMP nsMsgPrintEngine::GetDoPrintPreview(bool *aDoPrintPreview)
+{
+  NS_ENSURE_ARG_POINTER(aDoPrintPreview);
+  *aDoPrintPreview = mIsDoingPrintPreview;
+  return NS_OK;
+}
+NS_IMETHODIMP nsMsgPrintEngine::SetDoPrintPreview(bool aDoPrintPreview)
+{
+  mIsDoingPrintPreview = aDoPrintPreview;
+  return NS_OK;
+}
+
+/* void setMsgType (in long aMsgType); */
+NS_IMETHODIMP nsMsgPrintEngine::SetMsgType(int32_t aMsgType)
+{
+  if (mMsgInx >= nsIMsgPrintEngine::MNAB_START && mMsgInx < nsIMsgPrintEngine::MNAB_END) 
+  {
+    mMsgInx = aMsgType;
+    return NS_OK;
+  }
+  return NS_ERROR_FAILURE;
+}
+
+/*=============== nsIObserver Interface ======================*/
+NS_IMETHODIMP nsMsgPrintEngine::Observe(nsISupports *aSubject, const char *aTopic, const char16_t *aData)
+{
+  return FireThatLoadOperation(mLoadURI);
+}