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diff --git a/include/sfx2/sidebar/Theme.hxx b/include/sfx2/sidebar/Theme.hxx
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+++ b/include/sfx2/sidebar/Theme.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/.
+ *
+ * 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 <sfx2/dllapi.h>
+
+#include <tools/color.hxx>
+#include <comphelper/compbase.hxx>
+
+#include <com/sun/star/beans/XPropertySet.hpp>
+
+#include <map>
+#include <unordered_map>
+
+
+namespace sfx2::sidebar {
+
+typedef comphelper::WeakComponentImplHelper <
+    css::beans::XPropertySet,
+    css::beans::XPropertySetInfo
+    > ThemeInterfaceBase;
+
+/** Simple collection of colors, gradients, fonts that define the
+    look of the sidebar and its controls.
+*/
+class SFX2_DLLPUBLIC Theme final
+    : public ThemeInterfaceBase
+{
+public:
+    enum ThemeItem
+    {
+        Begin_,
+        Pre_Color_ = Begin_,
+
+        AnyItem_ = Pre_Color_,
+
+        Image_Color_,
+
+        Color_Highlight,
+        Color_HighlightText,
+        Color_DeckBackground,
+        Color_DeckTitleBarBackground,
+        Color_PanelBackground,
+        Color_PanelTitleBarBackground,
+        Color_TabBarBackground,
+
+        Color_Int_,
+
+        Int_DeckBorderSize,
+        Int_DeckSeparatorHeight,
+        Int_DeckLeftPadding,
+        Int_DeckTopPadding,
+        Int_DeckRightPadding,
+        Int_DeckBottomPadding,
+
+        Int_Bool_,
+
+        Bool_UseSystemColors,
+        Bool_IsHighContrastModeActive,
+
+        Post_Bool_,
+        End_=Post_Bool_
+    };
+
+    static Color GetColor (const ThemeItem eItem);
+    static sal_Int32 GetInteger (const ThemeItem eItem);
+
+    static bool IsHighContrastMode();
+
+    static void HandleDataChange();
+
+    void InitializeTheme();
+
+    Theme();
+    virtual ~Theme() override;
+    Theme(const Theme&) = delete;
+    Theme& operator=( const Theme& ) = delete;
+
+    virtual void disposing(std::unique_lock<std::mutex>&) override;
+
+    static css::uno::Reference<css::beans::XPropertySet> GetPropertySet();
+
+    // beans::XPropertySet
+    virtual css::uno::Reference<css::beans::XPropertySetInfo> SAL_CALL getPropertySetInfo() override;
+    virtual void SAL_CALL setPropertyValue (
+        const OUString& rsPropertyName,
+        const css::uno::Any& rValue) override;
+    virtual css::uno::Any SAL_CALL getPropertyValue (
+        const OUString& rsPropertyName) override;
+    virtual void SAL_CALL addPropertyChangeListener(
+        const OUString& rsPropertyName,
+        const css::uno::Reference<css::beans::XPropertyChangeListener>& rxListener) override;
+    virtual void SAL_CALL removePropertyChangeListener(
+        const OUString& rsPropertyName,
+        const css::uno::Reference<css::beans::XPropertyChangeListener>& rxListener) override;
+    virtual void SAL_CALL addVetoableChangeListener(
+        const OUString& rsPropertyName,
+        const css::uno::Reference<css::beans::XVetoableChangeListener>& rxListener) override;
+    virtual void SAL_CALL removeVetoableChangeListener(
+        const OUString& rsPropertyName,
+        const css::uno::Reference<css::beans::XVetoableChangeListener>& rxListener) override;
+
+    // beans::XPropertySetInfo
+    virtual css::uno::Sequence<css::beans::Property> SAL_CALL getProperties() override;
+    virtual css::beans::Property SAL_CALL getPropertyByName (const OUString& rsName) override;
+    virtual sal_Bool SAL_CALL hasPropertyByName (const OUString& rsName) override;
+
+private:
+    static Theme& GetCurrentTheme();
+
+    std::vector<Color> maColors;
+    std::vector<sal_Int32> maIntegers;
+    std::vector<bool> maBooleans;
+    bool mbIsHighContrastMode;
+    bool mbIsHighContrastModeSetManually;
+
+    typedef std::unordered_map<OUString,ThemeItem> PropertyNameToIdMap;
+    PropertyNameToIdMap maPropertyNameToIdMap;
+    typedef std::vector<OUString> PropertyIdToNameMap;
+    PropertyIdToNameMap maPropertyIdToNameMap;
+    typedef ::std::vector<css::uno::Any> RawValueContainer;
+    RawValueContainer maRawValues;
+
+    typedef std::vector<css::uno::Reference<css::beans::XPropertyChangeListener> > ChangeListenerContainer;
+    typedef std::map<ThemeItem,ChangeListenerContainer> ChangeListeners;
+    ChangeListeners maChangeListeners;
+    typedef std::vector<css::uno::Reference<css::beans::XVetoableChangeListener> > VetoableListenerContainer;
+    typedef std::map<ThemeItem,VetoableListenerContainer> VetoableListeners;
+    VetoableListeners maVetoableListeners;
+
+    enum PropertyType
+    {
+        PT_Color,
+        PT_Integer,
+        PT_Boolean,
+        PT_Invalid
+    };
+
+    void SetupPropertyMaps();
+    void UpdateTheme();
+    static PropertyType GetPropertyType (const ThemeItem eItem);
+    static css::uno::Type const & GetCppuType (const PropertyType eType);
+    static sal_Int32 GetIndex (
+        const ThemeItem eItem,
+        const PropertyType eType);
+
+    VetoableListenerContainer* GetVetoableListeners (
+        const ThemeItem eItem,
+        const bool bCreate);
+    ChangeListenerContainer* GetChangeListeners (
+        const ThemeItem eItem,
+        const bool bCreate);
+    static bool DoVetoableListenersVeto (
+        const VetoableListenerContainer* pListeners,
+        const css::beans::PropertyChangeEvent& rEvent);
+    static void BroadcastPropertyChange (
+        const ChangeListenerContainer* pListeners,
+        const css::beans::PropertyChangeEvent& rEvent);
+    void ProcessNewValue (
+        const css::uno::Any& rValue,
+        const ThemeItem eItem,
+        const PropertyType eType);
+};
+
+
+} // end of namespace sfx2::sidebar
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */