gecko/layout/printing/nsPagePrintTimer.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2012-05-21 04:12:37 -07:00
/* 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/. */
#include "nsPagePrintTimer.h"
#include "nsIContentViewer.h"
#include "nsIServiceManager.h"
#include "nsPrintEngine.h"
NS_IMPL_ISUPPORTS1(nsPagePrintTimer, nsITimerCallback)
nsPagePrintTimer::nsPagePrintTimer() :
mPrintEngine(nsnull),
mDelay(0),
mFiringCount(0),
mPrintObj(nsnull)
{
}
nsPagePrintTimer::~nsPagePrintTimer()
{
// "Destroy" the document viewer; this normally doesn't actually
// destroy it because of the IncrementDestroyRefCount call below
// XXX This is messy; the document viewer should use a single approach
// to keep itself alive during printing
nsCOMPtr<nsIContentViewer> cv(do_QueryInterface(mDocViewerPrint));
if (cv) {
cv->Destroy();
}
}
nsresult
nsPagePrintTimer::StartTimer(bool aUseDelay)
{
nsresult result;
mTimer = do_CreateInstance("@mozilla.org/timer;1", &result);
if (NS_FAILED(result)) {
NS_WARNING("unable to start the timer");
} else {
PRUint32 delay = 0;
if (aUseDelay) {
if (mFiringCount < 10) {
// Longer delay for the few first pages.
delay = mDelay + ((10 - mFiringCount) * 100);
} else {
delay = mDelay;
}
}
mTimer->InitWithCallback(this, delay, nsITimer::TYPE_ONE_SHOT);
}
return result;
}
// nsITimerCallback
NS_IMETHODIMP
nsPagePrintTimer::Notify(nsITimer *timer)
{
if (mDocViewerPrint) {
bool initNewTimer = true;
// Check to see if we are done
// inRange will be true if a page is actually printed
bool inRange;
// donePrinting will be true if it completed successfully or
// if the printing was cancelled
bool donePrinting = mPrintEngine->PrintPage(mPrintObj, inRange);
if (donePrinting) {
// now clean up print or print the next webshell
if (mPrintEngine->DonePrintingPages(mPrintObj, NS_OK)) {
initNewTimer = false;
}
}
// Note that the Stop() destroys this after the print job finishes
// (The PrintEngine stops holding a reference when DonePrintingPages
// returns true.)
Stop();
if (initNewTimer) {
++mFiringCount;
nsresult result = StartTimer(inRange);
if (NS_FAILED(result)) {
donePrinting = true; // had a failure.. we are finished..
mPrintEngine->SetIsPrinting(false);
}
}
}
return NS_OK;
}
void
nsPagePrintTimer::Init(nsPrintEngine* aPrintEngine,
nsIDocumentViewerPrint* aDocViewerPrint,
PRUint32 aDelay)
{
mPrintEngine = aPrintEngine;
mDocViewerPrint = aDocViewerPrint;
mDelay = aDelay;
mDocViewerPrint->IncrementDestroyRefCount();
}
nsresult
nsPagePrintTimer::Start(nsPrintObject* aPO)
{
mPrintObj = aPO;
return StartTimer(false);
}
void
nsPagePrintTimer::Stop()
{
if (mTimer) {
mTimer->Cancel();
mTimer = nsnull;
}
}
nsresult NS_NewPagePrintTimer(nsPagePrintTimer **aResult)
{
NS_PRECONDITION(aResult, "null param");
nsPagePrintTimer* result = new nsPagePrintTimer;
if (!result) {
*aResult = nsnull;
return NS_ERROR_OUT_OF_MEMORY;
}
NS_ADDREF(result);
*aResult = result;
return NS_OK;
}