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-rw-r--r--dom/base/mozAutoDocUpdate.h91
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diff --git a/dom/base/mozAutoDocUpdate.h b/dom/base/mozAutoDocUpdate.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 mozAutoDocUpdate_h_
+#define mozAutoDocUpdate_h_
+
+#include "nsContentUtils.h" // For AddScriptBlocker() and RemoveScriptBlocker().
+#include "nsIDocument.h"
+#include "nsIDocumentObserver.h"
+
+/**
+ * Helper class to automatically handle batching of document updates. This
+ * class will call BeginUpdate on construction and EndUpdate on destruction on
+ * the given document with the given update type. The document could be null,
+ * in which case no updates will be called. The constructor also takes a
+ * boolean that can be set to false to prevent notifications.
+ */
+class MOZ_STACK_CLASS mozAutoDocUpdate
+{
+public:
+ mozAutoDocUpdate(nsIDocument* aDocument, nsUpdateType aUpdateType,
+ bool aNotify) :
+ mDocument(aNotify ? aDocument : nullptr),
+ mUpdateType(aUpdateType)
+ {
+ if (mDocument) {
+ mDocument->BeginUpdate(mUpdateType);
+ }
+ else {
+ nsContentUtils::AddScriptBlocker();
+ }
+ }
+
+ ~mozAutoDocUpdate()
+ {
+ if (mDocument) {
+ mDocument->EndUpdate(mUpdateType);
+ }
+ else {
+ nsContentUtils::RemoveScriptBlocker();
+ }
+ }
+
+private:
+ nsCOMPtr<nsIDocument> mDocument;
+ nsUpdateType mUpdateType;
+};
+
+#define MOZ_AUTO_DOC_UPDATE_PASTE2(tok,line) tok##line
+#define MOZ_AUTO_DOC_UPDATE_PASTE(tok,line) \
+ MOZ_AUTO_DOC_UPDATE_PASTE2(tok,line)
+#define MOZ_AUTO_DOC_UPDATE(doc,type,notify) \
+ mozAutoDocUpdate MOZ_AUTO_DOC_UPDATE_PASTE(_autoDocUpdater_, __LINE__) \
+ (doc,type,notify)
+
+
+/**
+ * Creates an update batch only under certain conditions.
+ * Use this rather than mozAutoDocUpdate when you expect inner updates
+ * to notify but you don't always want to spec cycles creating a batch.
+ * This is needed to avoid having this batch always create a blocker,
+ * but then have inner mozAutoDocUpdate call the last EndUpdate before.
+ * we remove that blocker. See bug 423269.
+ */
+class MOZ_STACK_CLASS mozAutoDocConditionalContentUpdateBatch
+{
+public:
+ mozAutoDocConditionalContentUpdateBatch(nsIDocument* aDocument,
+ bool aNotify) :
+ mDocument(aNotify ? aDocument : nullptr)
+ {
+ if (mDocument) {
+ mDocument->BeginUpdate(UPDATE_CONTENT_MODEL);
+ }
+ }
+
+ ~mozAutoDocConditionalContentUpdateBatch()
+ {
+ if (mDocument) {
+ mDocument->EndUpdate(UPDATE_CONTENT_MODEL);
+ }
+ }
+
+private:
+ nsCOMPtr<nsIDocument> mDocument;
+};
+
+#endif