gecko-dev/layout/printing/nsPrintObject.cpp

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 "nsPrintObject.h"

#include "nsIContentViewer.h"
#include "nsContentUtils.h"  // for nsAutoScriptBlocker
#include "nsIInterfaceRequestorUtils.h"
#include "nsPIDOMWindow.h"
#include "nsPresContext.h"
#include "nsGkAtoms.h"
#include "nsComponentManagerUtils.h"
#include "nsIBaseWindow.h"
#include "nsDocShell.h"

#include "mozilla/PresShell.h"
#include "mozilla/dom/BrowsingContext.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/Element.h"

using namespace mozilla;
using mozilla::dom::BrowsingContext;
using mozilla::dom::Document;
using mozilla::dom::Element;
using mozilla::dom::Selection;

//---------------------------------------------------
//-- nsPrintObject Class Impl
//---------------------------------------------------
nsPrintObject::nsPrintObject()
    : mContent(nullptr),
      mFrameType(eFrame),
      mParent(nullptr),
      mHasBeenPrinted(false),
      mInvisible(false),
      mDidCreateDocShell(false),
      mShrinkRatio(1.0),
      mZoomRatio(1.0) {
  MOZ_COUNT_CTOR(nsPrintObject);
}

nsPrintObject::~nsPrintObject() {
  MOZ_COUNT_DTOR(nsPrintObject);

  DestroyPresentation();
  if (mDidCreateDocShell && mDocShell) {
    RefPtr<BrowsingContext> bc(mDocShell->GetBrowsingContext());
    nsDocShell::Cast(mDocShell)->Destroy();
    bc->Detach();
  }
  mDocShell = nullptr;
  mTreeOwner = nullptr;  // mTreeOwner must be released after mDocShell;
}

//------------------------------------------------------------------

nsresult nsPrintObject::InitAsRootObject(nsIDocShell* aDocShell, Document* aDoc,
                                         bool aForPrintPreview) {
  NS_ENSURE_STATE(aDocShell);
  NS_ENSURE_STATE(aDoc);

  MOZ_ASSERT(aDoc->IsStaticDocument());

  mDocShell = aDocShell;
  mDocument = aDoc;

  // Ensure the document has no presentation.
  DestroyPresentation();

  return NS_OK;
}

nsresult nsPrintObject::InitAsNestedObject(nsIDocShell* aDocShell,
                                           Document* aDoc,
                                           nsPrintObject* aParent) {
  NS_ENSURE_STATE(aDocShell);
  NS_ENSURE_STATE(aDoc);

  mParent = aParent;
  mDocShell = aDocShell;
  mDocument = aDoc;

  nsCOMPtr<nsPIDOMWindowOuter> window = aDoc->GetWindow();
  mContent = window->GetFrameElementInternal();

  // "frame" elements not in a frameset context should be treated
  // as iframes
  if (mContent->IsHTMLElement(nsGkAtoms::frame) &&
      mParent->mFrameType == eFrameSet) {
    mFrameType = eFrame;
  } else {
    // Assume something iframe-like, i.e. iframe, object, or embed
    mFrameType = eIFrame;
  }
  return NS_OK;
}

//------------------------------------------------------------------
// Resets PO by destroying the presentation
void nsPrintObject::DestroyPresentation() {
  if (mDocument) {
    if (RefPtr<PresShell> ps = mDocument->GetPresShell()) {
      MOZ_DIAGNOSTIC_ASSERT(!mPresShell || ps == mPresShell);
      mPresShell = nullptr;
      nsAutoScriptBlocker scriptBlocker;
      ps->EndObservingDocument();
      ps->Destroy();
    }
  }
  mPresShell = nullptr;
  mPresContext = nullptr;
  mViewManager = nullptr;
}

void nsPrintObject::EnablePrinting(bool aEnable) {
  mPrintingIsEnabled = aEnable;

  for (const UniquePtr<nsPrintObject>& kid : mKids) {
    kid->EnablePrinting(aEnable);
  }
}

bool nsPrintObject::HasSelection() const {
  return mDocument && mDocument->GetProperty(nsGkAtoms::printselectionranges);
}

void nsPrintObject::EnablePrintingSelectionOnly() {
  mPrintingIsEnabled = HasSelection();

  for (const UniquePtr<nsPrintObject>& kid : mKids) {
    kid->EnablePrintingSelectionOnly();
  }
}