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       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_SLIDESHOW_SHAPEATTRIBUTELAYERHOLDER_HXX
      21                 :            : #define INCLUDED_SLIDESHOW_SHAPEATTRIBUTELAYERHOLDER_HXX
      22                 :            : 
      23                 :            : #include "attributableshape.hxx"
      24                 :            : #include "shapeattributelayer.hxx"
      25                 :            : 
      26                 :            : #include <boost/noncopyable.hpp>
      27                 :            : 
      28                 :            : namespace slideshow
      29                 :            : {
      30                 :            :     namespace internal
      31                 :            :     {
      32                 :            :         /** Holds a ShapeAttributeLayer, together with the associated
      33                 :            :             Shape
      34                 :            : 
      35                 :            :             Use this class to hold ShapeAttributeLayer objects the
      36                 :            :             RAII way. When this object gets deleted, it will
      37                 :            :             automatically revoke the attribute layer for the given
      38                 :            :             shape (this encapsulates the somewhat clumsy notification
      39                 :            :             process that is required for shape and attribute layer
      40                 :            :             interaction).
      41                 :            :          */
      42                 :            :         class ShapeAttributeLayerHolder : private boost::noncopyable
      43                 :            :         {
      44                 :            :         public:
      45                 :            :             /** Create a ShapeAttributeLayerHolder instance.
      46                 :            : 
      47                 :            :                 This constructor creates an empty attribute holder, to
      48                 :            :                 generate an attribute layer, you have to manually call
      49                 :            :                 createAttributeLayer().
      50                 :            :              */
      51                 :          0 :             ShapeAttributeLayerHolder() :
      52                 :            :                 mpShape(),
      53                 :          0 :                 mpAttributeLayer()
      54                 :            :             {
      55                 :          0 :             }
      56                 :            : 
      57                 :          0 :             ~ShapeAttributeLayerHolder()
      58                 :          0 :             {
      59                 :          0 :                 reset(); // ensures that the last attribute layer is
      60                 :            :                          // correctly deregistered from the shape.
      61                 :          0 :             }
      62                 :            : 
      63                 :          0 :             void reset()
      64                 :            :             {
      65                 :          0 :                 if( mpShape && mpAttributeLayer )
      66                 :          0 :                     mpShape->revokeAttributeLayer( mpAttributeLayer );
      67                 :          0 :             }
      68                 :            : 
      69                 :            :             /** This constructor receives a pointer to the Shape, from
      70                 :            :                 which attribute layers should be generated. Initially,
      71                 :            :                 this object does not create an attribute layer, you
      72                 :            :                 have to manually call createAttributeLayer().
      73                 :            : 
      74                 :            :                 @param rShape
      75                 :            :                 Shape for which attribute layers should be generated.
      76                 :            :             */
      77                 :          0 :             bool createAttributeLayer( const AttributableShapeSharedPtr& rShape )
      78                 :            :             {
      79                 :          0 :                 reset();
      80                 :            : 
      81                 :          0 :                 mpShape = rShape;
      82                 :            : 
      83                 :          0 :                 if( mpShape )
      84                 :          0 :                     mpAttributeLayer = mpShape->createAttributeLayer();
      85                 :            : 
      86                 :          0 :                 return mpAttributeLayer;
      87                 :            :             }
      88                 :            : 
      89                 :          0 :             ShapeAttributeLayerSharedPtr get() const
      90                 :            :             {
      91                 :          0 :                 return mpAttributeLayer;
      92                 :            :             }
      93                 :            : 
      94                 :            :         private:
      95                 :            :             AttributableShapeSharedPtr      mpShape;
      96                 :            :             ShapeAttributeLayerSharedPtr    mpAttributeLayer;
      97                 :            :         };
      98                 :            : 
      99                 :            :     }
     100                 :            : }
     101                 :            : 
     102                 :            : #endif /* INCLUDED_SLIDESHOW_SHAPEATTRIBUTELAYERHOLDER_HXX */
     103                 :            : 
     104                 :            : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */