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The Tor Browser
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AutoPrintEventDispatcher.h (2213B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #ifndef mozilla_dom_AutoPrintEventDispatcher_h
      8 #define mozilla_dom_AutoPrintEventDispatcher_h
      9 
     10 #include "mozilla/dom/Document.h"
     11 #include "mozilla/dom/DocumentInlines.h"
     12 #include "nsContentUtils.h"
     13 #include "nsGlobalWindowOuter.h"
     14 #include "nsIPrintSettings.h"
     15 
     16 namespace mozilla::dom {
     17 
     18 class AutoPrintEventDispatcher {
     19  // NOTE(emilio): For fission iframes, we dispatch this event in
     20  // RecvCloneDocumentTreeIntoSelf.
     21  static void CollectInProcessSubdocuments(
     22      Document& aDoc, nsTArray<nsCOMPtr<Document>>& aDocs) {
     23    aDoc.EnumerateSubDocuments([&aDocs](Document& aSubDoc) {
     24      aDocs.AppendElement(&aSubDoc);
     25      CollectInProcessSubdocuments(aSubDoc, aDocs);
     26      return CallState::Continue;
     27    });
     28  }
     29 
     30  MOZ_CAN_RUN_SCRIPT void DispatchEvent(bool aBefore) {
     31    for (auto& doc : mDocuments) {
     32      nsContentUtils::DispatchTrustedEvent(
     33          doc, nsGlobalWindowOuter::Cast(doc->GetWindow()),
     34          aBefore ? u"beforeprint"_ns : u"afterprint"_ns, CanBubble::eNo,
     35          Cancelable::eNo, nullptr);
     36      if (RefPtr<nsPresContext> presContext = doc->GetPresContext()) {
     37        presContext->EmulateMedium(aBefore ? nsGkAtoms::print : nullptr);
     38        // Ensure media query listeners fire.
     39        // FIXME(emilio): This is hacky, at best, but is required for compat
     40        // with some pages, see bug 774398.
     41        doc->EvaluateMediaQueriesAndReportChanges();
     42      }
     43    }
     44  }
     45 
     46 public:
     47  MOZ_CAN_RUN_SCRIPT explicit AutoPrintEventDispatcher(Document& aDoc) {
     48    if (!aDoc.IsStaticDocument()) {
     49      mDocuments.AppendElement(&aDoc);
     50      CollectInProcessSubdocuments(aDoc, mDocuments);
     51    }
     52 
     53    DispatchEvent(true);
     54  }
     55 
     56  MOZ_CAN_RUN_SCRIPT ~AutoPrintEventDispatcher() { DispatchEvent(false); }
     57 
     58  AutoTArray<nsCOMPtr<Document>, 8> mDocuments;
     59  const nsSize mPageSize;
     60  nsRect mVisibleAreaToRestore;
     61 };
     62 
     63 }  // namespace mozilla::dom
     64 
     65 #endif