sd/source/ui/slidesorter/inc/view/SlsFontProvider.hxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef INCLUDED_SD_SOURCE_UI_SLIDESORTER_INC_VIEW_SLSFONTPROVIDER_HXX
  21 #define INCLUDED_SD_SOURCE_UI_SLIDESORTER_INC_VIEW_SLSFONTPROVIDER_HXX
  22
  23 #include <tools/SdGlobalResourceContainer.hxx>
  24
  25 #include <memory>
  26
  27 namespace vcl { class Font; }
  28
  29 namespace sd { namespace slidesorter { namespace view {
  30
  31 /** This simple singleton class provides fonts that are scaled so that they
  32     have a fixed height on the given device regardless of its map mode.
  33 */
  34 class FontProvider
  35     : public SdGlobalResource
  36 {
  37 public:
  38     /** Return the single instance of this class.  Throws a RuntimeException
  39         when no instance can be created.
  40     */
  41     static FontProvider& Instance();
  42
  43     /** Call this method to tell an object to release its currently used
  44         font.  The next call to GetFont() will then create a new one.
  45         Typically called after a DataChange event when for instance a system
  46         font has been modified.
  47     */
  48     void Invalidate();
  49
  50 private:
  51     static FontProvider* mpInstance;
  52
  53     /** The font that was created by a previous call to GetFont().  It is
  54         replaced by another one only when GetFont() is called with a device
  55         with a different map mode or by a call to Invalidate().
  56     */
  57     std::shared_ptr<vcl::Font> maFont;
  58
  59     FontProvider();
  60     virtual ~FontProvider() override;
  61
  62     FontProvider (const FontProvider&) = delete;
  63     FontProvider& operator= (const FontProvider&) = delete;
  64 };
  65
  66 } } } // end of namespace ::sd::slidesorter::view
  67
  68 #endif
  69
  70 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */