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diff --git a/include/sfx2/lokcallback.hxx b/include/sfx2/lokcallback.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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/.
+ */
+
+#pragma once
+
+#include <sal/types.h>
+
+namespace rtl
+{
+class OString;
+class OStringBuffer;
+}
+namespace tools
+{
+class Rectangle;
+}
+
+// An extended callback type that allows passing in also some binary data,
+// so that post-processing the messages does not require conversions
+// from and to strings.
+
+// TODO: It might possibly make sense to drop the generic type/payload function
+// and have only a dedicated function for each message type?
+
+class SAL_NO_VTABLE SAL_DLLPUBLIC_RTTI SfxLokCallbackInterface
+{
+public:
+ virtual ~SfxLokCallbackInterface() {}
+ // LibreOfficeKitCallback equivalent.
+ virtual void libreOfficeKitViewCallback(int nType, const rtl::OString& pPayload) = 0;
+ // Callback that explicitly provides view id (which is also included in the payload).
+ virtual void libreOfficeKitViewCallbackWithViewId(int nType, const rtl::OString& pPayload,
+ int nViewId)
+ = 0;
+ // LOK_CALLBACK_INVALIDATE_TILES
+ // nPart is either part, -1 for all-parts, or INT_MIN if
+ // comphelper::LibreOfficeKit::isPartInInvalidation() is not set
+ virtual void libreOfficeKitViewInvalidateTilesCallback(const tools::Rectangle* pRect, int nPart,
+ int nMode)
+ = 0;
+ // A message of the given type should be sent, for performance purpose only a notification
+ // is given here, details about the message should be queried from SfxViewShell when necessary.
+ // This is used for messages that are generated often but only the last one is needed.
+ virtual void libreOfficeKitViewUpdatedCallback(int nType) = 0;
+ // Like libreOfficeKitViewUpdatedCallback(), but a last message is needed for each nViewId value.
+ // SfxViewShell:getLOKPayload() will be called on nSourceViewId view.
+ virtual void libreOfficeKitViewUpdatedCallbackPerViewId(int nType, int nViewId,
+ int nSourceViewId)
+ = 0;
+ // There are pending invalidate tiles calls that need to be processed.
+ // A call to SfxViewShell::flushPendingLOKInvalidateTiles() should be scheduled.
+ virtual void libreOfficeKitViewAddPendingInvalidateTiles() = 0;
+ virtual void dumpState(rtl::OStringBuffer& rState) = 0;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */