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| -rw-r--r-- | slideshow/source/engine/slide/layer.hxx | 263 |
1 files changed, 263 insertions, 0 deletions
diff --git a/slideshow/source/engine/slide/layer.hxx b/slideshow/source/engine/slide/layer.hxx new file mode 100644 index 000000000..73f3fcce9 --- /dev/null +++ b/slideshow/source/engine/slide/layer.hxx @@ -0,0 +1,263 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/* + * This file is part of the LibreOffice project. + * + * This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. + * + * This file incorporates work covered by the following license notice: + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed + * with this work for additional information regarding copyright + * ownership. The ASF licenses this file to you under the Apache + * License, Version 2.0 (the "License"); you may not use this file + * except in compliance with the License. You may obtain a copy of + * the License at http://www.apache.org/licenses/LICENSE-2.0 . + */ + +#ifndef INCLUDED_SLIDESHOW_SOURCE_ENGINE_SLIDE_LAYER_HXX +#define INCLUDED_SLIDESHOW_SOURCE_ENGINE_SLIDE_LAYER_HXX + +#include <basegfx/range/b2dpolyrange.hxx> + +#include <shape.hxx> +#include <view.hxx> + +#include <vector> +#include <memory> + + +namespace slideshow::internal + { + class LayerEndUpdate; + class Layer; + typedef ::std::shared_ptr< Layer > LayerSharedPtr; + typedef ::std::weak_ptr< Layer > LayerWeakPtr; + + + /* Definition of Layer class */ + + /** This class represents one layer of output on a Slide. + + Layers group shapes for a certain depth region of a slide. + + Since slides have a notion of depth, i.e. shapes on it + have a certain order in which they lie upon each other, + this layering must be modelled. A prime example for this + necessity are animations of shapes lying behind other + shapes. Then, everything behind the animated shape will be + in a background layer, the shape itself will be in an + animation layer, and everything before it will be in a + foreground layer (these layers are most preferably + modelled as XSprite objects internally). + + @attention All methods of this class are only supposed to + be called from the LayerManager. Normally, it shouldn't be + possible to get hold of an instance of this class at all. + */ + class Layer : public std::enable_shared_from_this<Layer> + { + public: + typedef std::shared_ptr<LayerEndUpdate> EndUpdater; + + /// Forbid copy construction + Layer(const Layer&) = delete; + /// Forbid copy assignment + Layer& operator=(const Layer&) = delete; + + /** Create background layer + + This method will create a layer without a ViewLayer, + i.e. one that displays directly on the background. + */ + static LayerSharedPtr createBackgroundLayer(); + + /** Create non-background layer + + This method will create a layer in front of the + background, to contain shapes that should appear in + front of animated objects. + */ + static LayerSharedPtr createLayer(); + + + /** Predicate, whether this layer is the special + background layer + + This method is mostly useful for checking invariants. + */ + bool isBackgroundLayer() const { return mbBackgroundLayer; } + + /** Add a view to this layer. + + If the view is already added, this method does not add + it a second time, just returning the existing ViewLayer. + + @param rNewView + New view to add to this layer. + + @return the newly generated ViewLayer for this View + */ + ViewLayerSharedPtr addView( const ViewSharedPtr& rNewView ); + + /** Remove a view + + This method removes the view from this Layer and all + shapes included herein. + + @return the ViewLayer of the removed Layer, if + any. Otherwise, NULL is returned. + */ + ViewLayerSharedPtr removeView( const ViewSharedPtr& rView ); + + /** Init shape with this layer's views + + @param rShape + The shape, that will subsequently display on this + layer's views + */ + void setShapeViews( ShapeSharedPtr const& rShape ) const; + + + /** Change layer priority range. + + The layer priority affects the position of the layer + in the z direction (i.e. before/behind which other + layers this one appears). The higher the prio, the + further on top of the layer stack this one appears. + + @param rPrioRange + The priority range of differing layers must not + intersect + */ + void setPriority( const ::basegfx::B1DRange& rPrioRange ); + + /** Add an area that needs update + + @param rUpdateRange + Area on this layer that needs update + */ + void addUpdateRange( ::basegfx::B2DRange const& rUpdateRange ); + + /** Whether any update ranges have been added + + @return true, if any non-empty addUpdateRange() calls + have been made since the last render()/update() call. + */ + bool isUpdatePending() const { return maUpdateAreas.count()!=0; } + + /** Update layer bound rect from shape bounds + */ + void updateBounds( ShapeSharedPtr const& rShape ); + + /** Commit collected layer bounds to ViewLayer + + Call this method when you're done adding new shapes to + the layer. + + @return true, if layer needed a resize (which + invalidates its content - you have to repaint all + contained shapes!) + */ + bool commitBounds(); + + /** Clear all registered update ranges + + This method clears all update ranges that are + registered at this layer. + */ + void clearUpdateRanges(); + + /** Clear whole layer content + + This method clears the whole layer content. As a + byproduct, all update ranges are cleared as well. It + makes no sense to maintain them any further, since + they only serve for partial updates. + */ + void clearContent(); + + /** Init layer update. + + This method initializes a full layer update of the + update area. When the last copy of the returned + EndUpdater is destroyed, the Layer leaves update mode + again. + + @return an update end RAII object. + */ + EndUpdater beginUpdate(); + + /** Finish layer update + + Resets clipping and transformation to normal values + */ + void endUpdate(); + + /** Check whether given shape is inside current update area. + + @return true, if the given shape is at least partially + inside the current update area. + */ + bool isInsideUpdateArea( ShapeSharedPtr const& rShape ) const; + + private: + enum Dummy{ BackgroundLayer }; + + /** Create background layer + + This constructor will create a layer without a + ViewLayer, i.e. one that displays directly on the + background. + + @param eFlag + Dummy parameter, to disambiguate from normal layer + constructor + */ + explicit Layer( Dummy eFlag ); + + /** Create non-background layer + + This constructor will create a layer in front of the + background, to contain shapes that should appear in + front of animated objects. + */ + explicit Layer(); + + struct ViewEntry + { + ViewEntry( const ViewSharedPtr& rView, + const ViewLayerSharedPtr& rViewLayer ) : + mpView( rView ), + mpViewLayer( rViewLayer ) + {} + + ViewSharedPtr mpView; + ViewLayerSharedPtr mpViewLayer; + + // for generic algo access (which needs actual functions) + const ViewSharedPtr& getView() const { return mpView; } + const ViewLayerSharedPtr& getViewLayer() const { return mpViewLayer; } + }; + + typedef ::std::vector< ViewEntry > ViewEntryVector; + + ViewEntryVector maViewEntries; + basegfx::B2DPolyRange maUpdateAreas; + basegfx::B2DRange maBounds; + basegfx::B2DRange maNewBounds; + bool mbBoundsDirty; // true, if view layers need resize + bool mbBackgroundLayer; // true, if this + // layer is the + // special + // background layer + bool mbClipSet; // true, if beginUpdate set a clip + }; + +} + +#endif // INCLUDED_SLIDESHOW_SOURCE_ENGINE_SLIDE_LAYER_HXX + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |