svx/source/accessibility/lookupcolorname.cxx

   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 #include <sal/config.h>
  21
  22 #include <com/sun/star/container/XNameAccess.hpp>
  23 #include <com/sun/star/container/XNameContainer.hpp>
  24 #include <com/sun/star/drawing/ColorTable.hpp>
  25 #include <com/sun/star/uno/Any.hxx>
  26 #include <com/sun/star/uno/Reference.hxx>
  27 #include <com/sun/star/uno/RuntimeException.hpp>
  28 #include <com/sun/star/uno/Sequence.hxx>
  29 #include <comphelper/processfactory.hxx>
  30 #include <rtl/ustring.hxx>
  31 #include <vcl/svapp.hxx>
  32
  33 #include "lookupcolorname.hxx"
  34 #include <unordered_map>
  35
  36 namespace
  37 {
  38 class ColorNameMap
  39 {
  40 public:
  41     ColorNameMap();
  42     ColorNameMap(const ColorNameMap&) = delete;
  43     ColorNameMap& operator=(const ColorNameMap&) = delete;
  44
  45     OUString lookUp(tools::Long color) const;
  46
  47 private:
  48     typedef std::unordered_map<tools::Long, OUString> Map;
  49
  50     Map map_;
  51 };
  52
  53 ColorNameMap::ColorNameMap()
  54 {
  55     css::uno::Sequence<OUString> aNames;
  56     css::uno::Reference<css::container::XNameAccess> xNA;
  57
  58     try
  59     {
  60         // Create color table in which to look up the given color.
  61         css::uno::Reference<css::container::XNameContainer> xColorTable
  62             = css::drawing::ColorTable::create(comphelper::getProcessComponentContext());
  63
  64         // Get list of color names in order to iterate over the color table.
  65
  66         // Lock the solar mutex here as workaround for missing lock in
  67         // called function.
  68         SolarMutexGuard aGuard;
  69         xNA = xColorTable;
  70         aNames = xColorTable->getElementNames();
  71     }
  72     catch (css::uno::RuntimeException const&)
  73     {
  74         // When an exception occurred then we have an empty name sequence
  75         // and the loop below is not entered.
  76     }
  77
  78     // Fill the map to convert from numerical color values to names.
  79     if (!xNA.is())
  80         return;
  81
  82     for (const auto& rName : std::as_const(aNames))
  83     {
  84         // Get the numerical value for the i-th color name.
  85         try
  86         {
  87             css::uno::Any aColor = xNA->getByName(rName);
  88             tools::Long nColor = 0;
  89             aColor >>= nColor;
  90             map_[nColor] = rName;
  91         }
  92         catch (css::uno::RuntimeException const&)
  93         {
  94             // Ignore the exception: the color who lead to the exception
  95             // is not included into the map.
  96         }
  97     }
  98 }
  99
 100 OUString ColorNameMap::lookUp(tools::Long color) const
 101 {
 102     Map::const_iterator i(map_.find(color));
 103     if (i != map_.end())
 104     {
 105         return i->second;
 106     }
 107     // Did not find the given color; return its RGB tuple representation:
 108     return "#" + OUString::number(color, 16);
 109 }
 110
 111 struct theColorNameMap : public rtl::Static<ColorNameMap, theColorNameMap>
 112 {
 113 };
 114 }
 115
 116 namespace accessibility
 117 {
 118 OUString lookUpColorName(tools::Long color) { return theColorNameMap::get().lookUp(color); }
 119 }
 120
 121 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */