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git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@7598 a592a061-630c-0410-9148-cb99ea01b6c8
123 lines
2.9 KiB
C++
123 lines
2.9 KiB
C++
// -*- C++ -*-
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/**
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* \file renderers.h
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* This file is part of LyX, the document processor.
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* Licence details can be found in the file COPYING.
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*
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* \author Angus Leeming
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*
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* Full author contact details are available in file CREDITS.
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*/
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#ifndef RENDERERS_H
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#define RENDERERS_H
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#include "dimension.h"
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#include "graphics/GraphicsLoader.h"
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#include "graphics/GraphicsParams.h"
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#include "graphics/GraphicsTypes.h"
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#include <boost/weak_ptr.hpp>
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#include <boost/signals/signal0.hpp>
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class BufferView;
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class MetricsInfo;
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class PainterInfo;
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class RenderInset
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{
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public:
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virtual ~RenderInset();
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virtual RenderInset * clone() const = 0;
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/// compute the size of the object returned in dim
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virtual void metrics(MetricsInfo & mi, Dimension & dim) const = 0;
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/// draw inset and update (xo, yo)-cache
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virtual void draw(PainterInfo & pi, int x, int y) const = 0;
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/// An accessor function to the cached store.
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BufferView * view() const;
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protected:
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RenderInset();
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RenderInset(RenderInset const &);
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RenderInset & operator=(RenderInset const &);
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/// These are cached variables (are not copied).
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mutable boost::weak_ptr<BufferView> view_;
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mutable Dimension dim_;
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};
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class ButtonRenderer : public RenderInset
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{
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public:
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ButtonRenderer();
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virtual RenderInset * clone() const;
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/// This should provide the text for the button
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void update(string const &, bool editable);
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/// compute the size of the object returned in dim
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virtual void metrics(MetricsInfo & mi, Dimension & dim) const;
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/// draw inset and update (xo, yo)-cache
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virtual void draw(PainterInfo & pi, int x, int y) const;
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private:
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/// The stored data.
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string text_;
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bool editable_;
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};
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class GraphicRenderer : public RenderInset
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{
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public:
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GraphicRenderer();
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GraphicRenderer(GraphicRenderer const &);
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virtual RenderInset * clone() const;
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/// Refresh the info about which file to display and how to display it.
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void update(lyx::graphics::Params const & params);
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/// compute the size of the object returned in dim
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virtual void metrics(MetricsInfo & mi, Dimension & dim) const;
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/// draw inset and update (xo, yo)-cache
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virtual void draw(PainterInfo & pi, int x, int y) const;
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/// Is the stored checksum different to that of the graphics loader?
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bool hasFileChanged() const;
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/** Connect and you'll be informed when the loading status of the image
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* changes.
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*/
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typedef boost::signal0<void>::slot_type slot_type;
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virtual boost::signals::connection connect(slot_type const &) const;
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private:
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/// Not implemented.
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GraphicRenderer & operator=(GraphicRenderer const &);
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/// The message to display instead of the graphic itself.
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string const statusMessage() const;
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/// Is the image ready to draw, or should we display a message instead?
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bool readyToDisplay() const;
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/// The stored data.
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lyx::graphics::Loader loader_;
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lyx::graphics::Params params_;
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/// Cached variable (not copied).
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mutable unsigned long checksum_;
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};
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#endif // NOT RENDERERS_H
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