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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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <svl/ctloptions.hxx>
+#include <vcl/vclptr.hxx>
+
+#include <vector>
+
+namespace vcl
+{
+class Window;
+}
+class OutputDevice;
+class SdDrawDocument;
+
+namespace sd
+{
+/** The purpose of the <type>WindowUpdater</type> is to update output
+ devices to take care of modified global values. These values are
+ monitored for changes. At the moment this is
+ the digit language that defines the glyphs to use to render digits.
+ Other values may be added in the future.
+
+ <p>The methods of this class have not been included into the
+ <type>ViewShell</type> class in order to not clutter its interface any
+ further. This class accesses some of <type>ViewShell</type> data
+ members directly and thus is declared as its friend.</p>
+
+ <p>Windows that are to be kept up-to-date have to be registered via the
+ <member>RegisterWindow()</member> method. When a document is given then
+ this document is reformatted when the monitored option changes.</p>
+*/
+class WindowUpdater final : public utl::ConfigurationListener
+{
+public:
+ explicit WindowUpdater();
+ virtual ~WindowUpdater() noexcept override;
+
+ /** Add the given device to the list of devices which will be updated
+ when one of the monitored values changes.
+ @param pWindow
+ This device is added to the device list if it is not <null/> and
+ when it is not already a member of that list.
+ */
+ void RegisterWindow(vcl::Window* pWindow);
+
+ /** Remove the given device from the list of devices which will be updated
+ when one of the monitored values changes.
+ @param pWindow
+ This device is removed from the device list when it is a member
+ of that list.
+ */
+ void UnregisterWindow(vcl::Window* pWindow);
+
+ /** Set the document so that it is reformatted when one of the monitored
+ values changes.
+ @param pDocument
+ When <null/> is given document reformatting will not take
+ place in the future.
+ */
+ void SetDocument(SdDrawDocument* pDocument);
+
+ /** Update the given output device and update all text objects of the
+ view shell if not told otherwise.
+ @param pWindow
+ The device to update. When the given pointer is NULL then
+ nothing is done.
+ */
+ void Update(OutputDevice* pDevice) const;
+
+ /** Callback that waits for notifications of a
+ <type>SvtCTLOptions</type> object.
+ */
+ virtual void ConfigurationChanged(utl::ConfigurationBroadcaster*,
+ ConfigurationHints nHint) override;
+
+private:
+ /// Options to monitor for changes.
+ SvtCTLOptions maCTLOptions;
+
+ /// The document rendered in the output devices.
+ SdDrawDocument* mpDocument;
+
+ WindowUpdater(const WindowUpdater& rUpdater) = delete;
+
+ WindowUpdater operator=(const WindowUpdater& rUpdater) = delete;
+
+ /** Type and data member for a list of devices that have to be kept
+ up-to-date.
+ */
+ typedef ::std::vector<VclPtr<vcl::Window>> tWindowList;
+ tWindowList maWindowList;
+
+ /** The central method of this class. Update the given output device.
+ It is the task of the caller to initiate a reformatting of the
+ document that is rendered on this device to reflect the changes.
+ @param pWindow
+ The output device to update. When it is <null/> then the call
+ is ignored.
+ */
+ void UpdateWindow(OutputDevice* pDevice) const;
+};
+
+} // end of namespace sd
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */