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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_SOURCE_INC_ATTRIBUTABLESHAPE_HXX
      21             : #define INCLUDED_SLIDESHOW_SOURCE_INC_ATTRIBUTABLESHAPE_HXX
      22             : 
      23             : #include <boost/shared_ptr.hpp>
      24             : 
      25             : #include "animatableshape.hxx"
      26             : #include "shapeattributelayer.hxx"
      27             : #include "doctreenodesupplier.hxx"
      28             : 
      29             : namespace slideshow
      30             : {
      31             :     namespace internal
      32             :     {
      33             :         // forward declaration necessary, because methods use AttributableShapeSharedPtr
      34             :         class AttributableShape;
      35             : 
      36             :         typedef ::boost::shared_ptr< AttributableShape > AttributableShapeSharedPtr;
      37             : 
      38             :         /** Represents an animatable shape, that can have its
      39             :             attributes changed.
      40             : 
      41             :             Over an animatable shape, this interface adds attribute
      42             :             modification methods. Furthermore, the shape can be
      43             :             queried for sub items, which in turn can be separated out
      44             :             into own AttributableShapes.
      45             :          */
      46           0 :         class AttributableShape : public AnimatableShape
      47             :         {
      48             :         public:
      49             :             // Attribute layer methods
      50             : 
      51             : 
      52             :             /** Create a new shape attribute layer.
      53             : 
      54             :                 This method creates a new layer for shape attributes,
      55             :                 which lies atop of all previous attribute layers. That
      56             :                 is most typically used when a new SMIL animation
      57             :                 starts (which according to the spec always lies atop
      58             :                 of all previous animations). Thus, subsequent calls to
      59             :                 this method generate a sandwich of attribute layers,
      60             :                 which in total define the shape's attributes.
      61             : 
      62             :                 Please note that the attribute layers do <em>not</em>
      63             :                 contain the underlying XShape's attributes as
      64             :                 default. Instead, attributes not explicitly set by
      65             :                 animations remain in invalid state, allowing the
      66             :                 shape's paint method to determine whether they have to
      67             :                 override the underlying graphical shape
      68             :                 representation. XShape attributes must be passed
      69             :                 explicitly to animations which need them (e.g. 'by'
      70             :                 animations).
      71             : 
      72             :                 @return the new layer
      73             :              */
      74             :             virtual ShapeAttributeLayerSharedPtr createAttributeLayer() = 0;
      75             : 
      76             :             /** Revoke a previously generated attribute layer.
      77             : 
      78             :                 This method revokes a previously generated attribute
      79             :                 layer, and removes the effect of that layer from this
      80             :                 shape. The layer need not be the current toplevel
      81             :                 layer, it can also be revoked from in between.
      82             : 
      83             :                 @param rLayer
      84             :                 Layer to revoke. Must have been generated by
      85             :                 createAttributeLayer() at the same Shape.
      86             : 
      87             :                 @return true, if layer was successfully removed, false
      88             :                 otherwise (e.g. if the given layer was not generated
      89             :                 for this shape).
      90             :              */
      91             :             virtual bool revokeAttributeLayer( const ShapeAttributeLayerSharedPtr& rLayer ) = 0;
      92             : 
      93             :             /** Get the topmost shape attribute layer (if any).
      94             : 
      95             :                 This method returns the topmost layer for shape
      96             :                 attributes, i.e. the one which ultimately determines
      97             :                 the shape's look.
      98             : 
      99             :                 Please note that the attribute layers do <em>not</em>
     100             :                 contain the underlying XShape's attributes as
     101             :                 default. Instead, attributes not explicitly set by
     102             :                 animations remain in invalid state, allowing the
     103             :                 shape's paint method to determine whether they have to
     104             :                 override the underlying graphical shape
     105             :                 representation. XShape attributes must be passed
     106             :                 explicitly to animations which need them (e.g. 'by'
     107             :                 animations).
     108             : 
     109             :                 @return the topmost layer
     110             :              */
     111             :             virtual ShapeAttributeLayerSharedPtr getTopmostAttributeLayer() const = 0;
     112             : 
     113             : 
     114             :             /** Change default shape visibility
     115             : 
     116             :                 This method hides or unhides a shape. Note that every
     117             :                 attribute layer generated for this shape is able to
     118             :                 override the setting given here, until it is revoked.
     119             : 
     120             :                 @param bVisible
     121             :                 When true, shape will be visible, when false,
     122             :                 invisible (modulo attribute layer overrides).
     123             :              */
     124             :             virtual void setVisibility( bool bVisible ) = 0;
     125             : 
     126             :             // Sub-item handling
     127             : 
     128             : 
     129             :             /** Retrieve interface for DocTreeNode creation.
     130             : 
     131             :                 This method provides the caller with a reference to
     132             :                 the DocTreeNodeSupplier interface, which can be used
     133             :                 to request specific tree nodes for this shape.
     134             :              */
     135             :             virtual const DocTreeNodeSupplier& getTreeNodeSupplier() const = 0;
     136             :             virtual DocTreeNodeSupplier&       getTreeNodeSupplier() = 0;
     137             : 
     138             :             /** Query the subset this shape displays.
     139             : 
     140             :                 This method returns a tree node denoting the subset
     141             :                 displayed by this shape. If this shape is not a subset
     142             :                 shape, an empty tree node should be returned. If this
     143             :                 shape is a subset, and itself has subsetted children,
     144             :                 this method might return more than the shape is
     145             :                 actually displaying (because a single DocTreeNode is
     146             :                 not able to model holes in the range).
     147             :              */
     148             :             virtual DocTreeNode getSubsetNode() const = 0;
     149             : 
     150             :             /** Query a subset Shape, if already existent at this
     151             :                 object
     152             : 
     153             :                 This method returns a clone of this Shape, which
     154             :                 renders only the selected subset of itself, but only
     155             :                 if such a subset has been explicitly created before.
     156             : 
     157             :                 @param rTreeNode
     158             :                 A DocTreeNode instance queried from this Shape, which
     159             :                 specifies the subset of the Shape to render.
     160             : 
     161             :                 @return a NULL Shape pointer, if no subset exists for
     162             :                 the given DocTreeNode.
     163             :             */
     164             :             virtual AttributableShapeSharedPtr getSubset( const DocTreeNode& rTreeNode ) const = 0;
     165             : 
     166             :             /** Create a subset Shape
     167             : 
     168             :                 This method creates a clone of this Shape, which
     169             :                 renders only the selected subset of itself. Multiple
     170             :                 createSubset() calls for the same DocTreeNode will all
     171             :                 share the same subset shape.
     172             : 
     173             :                 The original shape (i.e. the one this method is called
     174             :                 on) will cease to display the selected subset
     175             :                 part. That is, together the shapes will display the
     176             :                 original content, but the content of all subset shapes
     177             :                 and their original shape will always be mutually
     178             :                 disjunct.
     179             : 
     180             :                 After deregistering the subset shape a matching number
     181             :                 of times via revokeSubset(), the original shape will
     182             :                 resume displaying the subsetted part.
     183             : 
     184             :                 @attention To maintain view integrity, this method
     185             :                 should only be called from the LayerManager
     186             : 
     187             :                 @param o_rSubset
     188             :                 The requested Shape
     189             : 
     190             :                 @param rTreeNode
     191             :                 A DocTreeNode instance queried from this Shape, which
     192             :                 specifies the subset of the Shape to render
     193             : 
     194             :                 @return true, if the shape was newly created, and
     195             :                 false, if an already existing subset is returned.
     196             :             */
     197             :             virtual bool createSubset( AttributableShapeSharedPtr&  o_rSubset,
     198             :                                        const DocTreeNode&           rTreeNode ) = 0;
     199             : 
     200             :             /** Revoke a previously generated shape subset.
     201             : 
     202             :                 After revoking a subset shape, the corresponding
     203             :                 subset part will become visible again on the original
     204             :                 shape.
     205             : 
     206             :                 @attention To maintain view integrity, this method
     207             :                 should only be called from the LayerManager
     208             : 
     209             :                 @param rShape
     210             :                 The subset to revoke
     211             : 
     212             :                 @return true, if the last client called
     213             :                 revokeSubset().
     214             :              */
     215             :             virtual bool revokeSubset( const AttributableShapeSharedPtr& rShape ) = 0;
     216             :         };
     217             :     }
     218             : }
     219             : 
     220             : #endif // INCLUDED_SLIDESHOW_SOURCE_INC_ATTRIBUTABLESHAPE_HXX
     221             : 
     222             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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