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fe390e9da1
git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@7239 a592a061-630c-0410-9148-cb99ea01b6c8
158 lines
2.7 KiB
C
158 lines
2.7 KiB
C
/**
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* \file PreviewImage.C
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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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#include <config.h>
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#include "PreviewImage.h"
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#include "PreviewLoader.h"
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#include "GraphicsImage.h"
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#include "GraphicsLoader.h"
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#include "support/lyxlib.h"
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#include <boost/bind.hpp>
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#include <boost/signals/trackable.hpp>
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using namespace lyx::support;
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namespace lyx {
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namespace graphics {
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struct PreviewImage::Impl : public boost::signals::trackable {
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///
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Impl(PreviewImage & p, PreviewLoader & l,
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string const & s, string const & f, double af);
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///
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~Impl();
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///
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Image const * image();
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///
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void statusChanged();
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///
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PreviewImage const & parent_;
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///
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PreviewLoader & ploader_;
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///
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Loader iloader_;
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///
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string const snippet_;
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///
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double const ascent_frac_;
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};
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PreviewImage::PreviewImage(PreviewLoader & l,
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string const & s,
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string const & f,
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double af)
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: pimpl_(new Impl(*this, l, s, f, af))
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{}
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PreviewImage::~PreviewImage()
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{}
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string const & PreviewImage::snippet() const
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{
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return pimpl_->snippet_;
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}
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int PreviewImage::ascent() const
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{
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Image const * const image = pimpl_->iloader_.image();
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if (!image)
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return 0;
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return int(pimpl_->ascent_frac_ * double(image->getHeight()));
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}
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int PreviewImage::descent() const
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{
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Image const * const image = pimpl_->iloader_.image();
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if (!image)
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return 0;
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// Avoids rounding errors.
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return image->getHeight() - ascent();
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}
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int PreviewImage::width() const
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{
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Image const * const image = pimpl_->iloader_.image();
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return image ? image->getWidth() : 0;
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}
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Image const * PreviewImage::image() const
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{
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return pimpl_->image();
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}
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PreviewImage::Impl::Impl(PreviewImage & p, PreviewLoader & l,
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string const & s,
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string const & bf,
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double af)
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: parent_(p), ploader_(l), iloader_(bf),
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snippet_(s), ascent_frac_(af)
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{
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iloader_.connect(boost::bind(&Impl::statusChanged, this));
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}
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PreviewImage::Impl::~Impl()
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{
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unlink(iloader_.filename());
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}
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Image const * PreviewImage::Impl::image()
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{
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if (iloader_.status() == WaitingToLoad)
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iloader_.startLoading();
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return iloader_.image();
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}
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void PreviewImage::Impl::statusChanged()
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{
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switch (iloader_.status()) {
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case WaitingToLoad:
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case Loading:
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case Converting:
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case Loaded:
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case ScalingEtc:
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break;
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case ErrorNoFile:
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case ErrorConverting:
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case ErrorLoading:
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case ErrorGeneratingPixmap:
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case ErrorUnknown:
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//lyx::unlink(iloader_.filename());
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ploader_.remove(snippet_);
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break;
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case Ready:
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unlink(iloader_.filename());
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ploader_.emitSignal(parent_);
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break;
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}
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}
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} // namespace graphics
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} // namespace lyx
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