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/* -*- 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/. */
#ifndef mozilla_dom_AutoPrintEventDispatcher_h
#define mozilla_dom_AutoPrintEventDispatcher_h
#include "mozilla/dom/Document.h"
#include "mozilla/dom/DocumentInlines.h"
#include "nsContentUtils.h"
#include "nsGlobalWindowOuter.h"
#include "nsIPrintSettings.h"
namespace mozilla::dom {
class AutoPrintEventDispatcher {
// NOTE(emilio): For fission iframes, we dispatch this event in
// RecvCloneDocumentTreeIntoSelf.
static void CollectInProcessSubdocuments(
Document& aDoc, nsTArray<nsCOMPtr<Document>>& aDocs) {
aDoc.EnumerateSubDocuments([&aDocs](Document& aSubDoc) {
aDocs.AppendElement(&aSubDoc);
CollectInProcessSubdocuments(aSubDoc, aDocs);
return CallState::Continue;
});
}
MOZ_CAN_RUN_SCRIPT void DispatchEvent(bool aBefore) {
for (auto& doc : mDocuments) {
nsContentUtils::DispatchTrustedEvent(
doc, nsGlobalWindowOuter::Cast(doc->GetWindow()),
aBefore ? u"beforeprint"_ns : u"afterprint"_ns, CanBubble::eNo,
Cancelable::eNo, nullptr);
if (RefPtr<nsPresContext> presContext = doc->GetPresContext()) {
presContext->EmulateMedium(aBefore ? nsGkAtoms::print : nullptr);
// Ensure media query listeners fire.
// FIXME(emilio): This is hacky, at best, but is required for compat
// with some pages, see bug 774398.
doc->EvaluateMediaQueriesAndReportChanges(/* aRecurse = */ false);
}
}
}
public:
MOZ_CAN_RUN_SCRIPT explicit AutoPrintEventDispatcher(Document& aDoc) {
if (!aDoc.IsStaticDocument()) {
mDocuments.AppendElement(&aDoc);
CollectInProcessSubdocuments(aDoc, mDocuments);
}
DispatchEvent(true);
}
MOZ_CAN_RUN_SCRIPT ~AutoPrintEventDispatcher() { DispatchEvent(false); }
AutoTArray<nsCOMPtr<Document>, 8> mDocuments;
const nsSize mPageSize;
nsRect mVisibleAreaToRestore;
};
} // namespace mozilla::dom
#endif
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