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Current view: top level - slideshow/source/engine/slide - layer.hxx (source / functions) Hit Total Coverage
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Date: 2015-06-13 12:38:46 Functions: 0 8 0.0 %
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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_ENGINE_SLIDE_LAYER_HXX
      21             : #define INCLUDED_SLIDESHOW_SOURCE_ENGINE_SLIDE_LAYER_HXX
      22             : 
      23             : #include <basegfx/range/b2dpolyrange.hxx>
      24             : #include <cppcanvas/spritecanvas.hxx>
      25             : 
      26             : #include "view.hxx"
      27             : #include "animatableshape.hxx"
      28             : 
      29             : #include <boost/shared_ptr.hpp>
      30             : #include <boost/weak_ptr.hpp>
      31             : #include <boost/noncopyable.hpp>
      32             : #include <boost/enable_shared_from_this.hpp>
      33             : 
      34             : #include <vector>
      35             : 
      36             : 
      37             : namespace slideshow
      38             : {
      39             :     namespace internal
      40             :     {
      41             :         class LayerEndUpdate;
      42             : 
      43             :         /* Definition of Layer class */
      44             : 
      45             :         /** This class represents one layer of output on a Slide.
      46             : 
      47             :             Layers group shapes for a certain depth region of a slide.
      48             : 
      49             :             Since slides have a notion of depth, i.e. shapes on it
      50             :             have a certain order in which they lie upon each other,
      51             :             this layering must be modelled. A prime example for this
      52             :             necessity are animations of shapes lying behind other
      53             :             shapes. Then, everything behind the animated shape will be
      54             :             in a background layer, the shape itself will be in an
      55             :             animation layer, and everything before it will be in a
      56             :             foreground layer (these layers are most preferably
      57             :             modelled as XSprite objects internally).
      58             : 
      59             :             @attention All methods of this class are only supposed to
      60             :             be called from the LayerManager. Normally, it shouldn't be
      61             :             possible to get hold of an instance of this class at all.
      62             :          */
      63           0 :         class Layer : public boost::enable_shared_from_this<Layer>,
      64             :                       private boost::noncopyable
      65             :         {
      66             :         public:
      67             :             typedef boost::shared_ptr<LayerEndUpdate> EndUpdater;
      68             : 
      69             :             /** Create background layer
      70             : 
      71             :                 This method will create a layer without a ViewLayer,
      72             :                 i.e. one that displays directly on the background.
      73             : 
      74             :                 @param rMaxLayerBounds
      75             :                 Maximal bounds of this layer, in user
      76             :                 coordinates. This layer will never be larger or extend
      77             :                 outside these bounds.
      78             :              */
      79             :             static ::boost::shared_ptr< Layer > createBackgroundLayer( const basegfx::B2DRange& rMaxLayerBounds );
      80             : 
      81             :             /** Create non-background layer
      82             : 
      83             :                 This method will create a layer in front of the
      84             :                 background, to contain shapes that should appear in
      85             :                 front of animated objects.
      86             : 
      87             :                 @param rMaxLayerBounds
      88             :                 Maximal bounds of this layer, in user
      89             :                 coordinates. This layer will never be larger or extend
      90             :                 outside these bounds.
      91             :              */
      92             :             static ::boost::shared_ptr< Layer > createLayer( const basegfx::B2DRange& rMaxLayerBounds );
      93             : 
      94             : 
      95             : 
      96             : 
      97             : 
      98             :             /** Predicate, whether this layer is the special
      99             :                 background layer
     100             : 
     101             :                 This method is mostly useful for checking invariants.
     102             :              */
     103             :             bool isBackgroundLayer() const { return mbBackgroundLayer; }
     104             : 
     105             :             /** Add a view to this layer.
     106             : 
     107             :                 If the view is already added, this method does not add
     108             :                 it a second time, just returning the existing ViewLayer.
     109             : 
     110             :                 @param rNewView
     111             :                 New view to add to this layer.
     112             : 
     113             :                 @return the newly generated ViewLayer for this View
     114             :              */
     115             :             ViewLayerSharedPtr addView( const ViewSharedPtr& rNewView );
     116             : 
     117             :             /** Remove a view
     118             : 
     119             :                 This method removes the view from this Layer and all
     120             :                 shapes included herein.
     121             : 
     122             :                 @return the ViewLayer of the removed Layer, if
     123             :                 any. Otherwise, NULL is returned.
     124             :              */
     125             :             ViewLayerSharedPtr removeView( const ViewSharedPtr& rView );
     126             : 
     127             :             /** Init shape with this layer's views
     128             : 
     129             :                 @param rShape
     130             :                 The shape, that will subsequently display on this
     131             :                 layer's views
     132             :              */
     133             :             void setShapeViews( ShapeSharedPtr const& rShape ) const;
     134             : 
     135             : 
     136             : 
     137             : 
     138             : 
     139             :             /** Change layer priority range.
     140             : 
     141             :                 The layer priority affects the position of the layer
     142             :                 in the z direction (i.e. before/behind which other
     143             :                 layers this one appears). The higher the prio, the
     144             :                 further on top of the layer stack this one appears.
     145             : 
     146             :                 @param rPrioRange
     147             :                 The priority range of differing layers must not
     148             :                 intersect
     149             :              */
     150             :             void setPriority( const ::basegfx::B1DRange& rPrioRange );
     151             : 
     152             :             /** Add an area that needs update
     153             : 
     154             :                 @param rUpdateRange
     155             :                 Area on this layer that needs update
     156             :              */
     157             :             void addUpdateRange( ::basegfx::B2DRange const& rUpdateRange );
     158             : 
     159             :             /** Whether any update ranges have been added
     160             : 
     161             :                 @return true, if any non-empty addUpdateRange() calls
     162             :                 have been made since the last render()/update() call.
     163             :              */
     164           0 :             bool isUpdatePending() const { return maUpdateAreas.count()!=0; }
     165             : 
     166             :             /** Update layer bound rect from shape bounds
     167             :              */
     168             :             void updateBounds( ShapeSharedPtr const& rShape );
     169             : 
     170             :             /** Commit collected layer bounds to ViewLayer
     171             : 
     172             :                 Call this method when you're done adding new shapes to
     173             :                 the layer.
     174             : 
     175             :                 @return true, if layer needed a resize (which
     176             :                 invalidates its content - you have to repaint all
     177             :                 contained shapes!)
     178             :              */
     179             :             bool commitBounds();
     180             : 
     181             :             /** Clear all registered update ranges
     182             : 
     183             :                 This method clears all update ranges that are
     184             :                 registered at this layer.
     185             :              */
     186             :             void clearUpdateRanges();
     187             : 
     188             :             /** Clear whole layer content
     189             : 
     190             :                 This method clears the whole layer content. As a
     191             :                 byproduct, all update ranges are cleared as well. It
     192             :                 makes no sense to maintain them any further, since
     193             :                 they only serve for partial updates.
     194             :              */
     195             :             void clearContent();
     196             : 
     197             :             /** Init layer update.
     198             : 
     199             :                 This method initializes a full layer update of the
     200             :                 update area. When the last copy of the returned
     201             :                 EndUpdater is destroyed, the Layer leaves update mode
     202             :                 again.
     203             : 
     204             :                 @return a update end RAII object.
     205             :             */
     206             :             EndUpdater beginUpdate();
     207             : 
     208             :             /** Finish layer update
     209             : 
     210             :                 Resets clipping and transformation to normal values
     211             :              */
     212             :             void endUpdate();
     213             : 
     214             :             /** Check whether given shape is inside current update area.
     215             : 
     216             :                 @return true, if the given shape is at least partially
     217             :                 inside the current update area.
     218             :             */
     219             :             bool isInsideUpdateArea( ShapeSharedPtr const& rShape ) const;
     220             : 
     221             :         private:
     222             :             enum Dummy{ BackgroundLayer };
     223             : 
     224             :             /** Create background layer
     225             : 
     226             :                 This constructor will create a layer without a
     227             :                 ViewLayer, i.e. one that displays directly on the
     228             :                 background.
     229             : 
     230             :                 @param rMaxLayerBounds
     231             :                 Maximal bounds of this layer, in user
     232             :                 coordinates. This layer will never be larger or extend
     233             :                 outside these bounds.
     234             : 
     235             :                 @param eFlag
     236             :                 Dummy parameter, to disambiguate from normal layer
     237             :                 constructor
     238             :              */
     239             :             Layer( const basegfx::B2DRange& rMaxLayerBounds,
     240             :                    Dummy                    eFlag );
     241             : 
     242             :             /** Create non-background layer
     243             : 
     244             :                 This constructor will create a layer in front of the
     245             :                 background, to contain shapes that should appear in
     246             :                 front of animated objects.
     247             : 
     248             :                 @param rMaxLayerBounds
     249             :                 Maximal bounds of this layer, in user
     250             :                 coordinates. This layer will never be larger or extend
     251             :                 outside these bounds.
     252             :              */
     253             :             explicit Layer( const basegfx::B2DRange& rMaxLayerBounds );
     254             : 
     255           0 :             struct ViewEntry
     256             :             {
     257           0 :                 ViewEntry( const ViewSharedPtr&      rView,
     258             :                            const ViewLayerSharedPtr& rViewLayer ) :
     259             :                     mpView( rView ),
     260           0 :                     mpViewLayer( rViewLayer )
     261           0 :                 {}
     262             : 
     263             :                 ViewSharedPtr      mpView;
     264             :                 ViewLayerSharedPtr mpViewLayer;
     265             : 
     266             :                 // for generic algo access (which needs actual functions)
     267           0 :                 const ViewSharedPtr&      getView() const { return mpView; }
     268           0 :                 const ViewLayerSharedPtr& getViewLayer() const { return mpViewLayer; }
     269             :             };
     270             : 
     271             :             typedef ::std::vector< ViewEntry > ViewEntryVector;
     272             : 
     273             :             ViewEntryVector            maViewEntries;
     274             :             basegfx::B2DPolyRange      maUpdateAreas;
     275             :             basegfx::B2DRange          maBounds;
     276             :             basegfx::B2DRange          maNewBounds;
     277             :             const basegfx::B2DRange    maMaxBounds;       // maBounds is clipped against this
     278             :             bool                       mbBoundsDirty;     // true, if view layers need resize
     279             :             bool                       mbBackgroundLayer; // true, if this
     280             :                                                           // layer is the
     281             :                                                           // special
     282             :                                                           // background layer
     283             :             bool                       mbClipSet; // true, if beginUpdate set a clip
     284             :         };
     285             : 
     286             :         typedef ::boost::shared_ptr< Layer >    LayerSharedPtr;
     287             :         typedef ::boost::weak_ptr< Layer >      LayerWeakPtr;
     288             :         typedef ::std::vector< LayerSharedPtr > LayerVector;
     289             : 
     290             :     }
     291             : }
     292             : 
     293             : #endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_SLIDE_LAYER_HXX
     294             : 
     295             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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