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-rw-r--r--dom/base/AutoPrintEventDispatcher.h62
1 files changed, 62 insertions, 0 deletions
diff --git a/dom/base/AutoPrintEventDispatcher.h b/dom/base/AutoPrintEventDispatcher.h
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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 "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) {
+ auto recurse = [&aDocs](Document& aSubDoc) {
+ aDocs.AppendElement(&aSubDoc);
+ CollectInProcessSubdocuments(aSubDoc, aDocs);
+ return CallState::Continue;
+ };
+ aDoc.EnumerateSubDocuments(recurse);
+ }
+
+ MOZ_CAN_RUN_SCRIPT void DispatchEvent(bool aBefore) {
+ for (auto& doc : mDocuments) {
+ nsContentUtils::DispatchTrustedEvent(
+ doc, 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.
+ doc->FlushPendingNotifications(FlushType::Style);
+ }
+ }
+ }
+
+ 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