lyx_mirror/src/insets/render_preview.C

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/**
* \file render_preview.C
* This file is part of LyX, the document processor.
* Licence details can be found in the file COPYING.
*
* \author Angus Leeming
*
* Full author contact details are available in file CREDITS.
*/
#include <config.h>
#include "insets/render_preview.h"
#include "insets/inset.h"
#include "BufferView.h"
#include "dimension.h"
#include "gettext.h"
#include "LColor.h"
#include "metricsinfo.h"
#include "frontends/font_metrics.h"
#include "frontends/Painter.h"
#include "graphics/PreviewImage.h"
#include "graphics/PreviewLoader.h"
#include "graphics/Previews.h"
#include "support/lstrings.h"
#include <boost/bind.hpp>
using std::string;
using std::auto_ptr;
namespace graphics = lyx::graphics;
namespace support = lyx::support;
bool RenderPreview::activated()
{
return graphics::Previews::activated();
}
RenderPreview::RenderPreview()
: pimage_(0)
{}
RenderPreview::RenderPreview(RenderPreview const & other)
: RenderBase(other),
boost::signals::trackable(),
snippet_(other.snippet_),
pimage_(0)
{}
auto_ptr<RenderBase> RenderPreview::clone() const
{
return auto_ptr<RenderBase>(new RenderPreview(*this));
}
namespace {
string const statusMessage(BufferView const * bv, string const & snippet)
{
BOOST_ASSERT(bv && bv->buffer());
Buffer const & buffer = *bv->buffer();
graphics::Previews const & previews = graphics::Previews::get();
graphics::PreviewLoader const & loader = previews.loader(buffer);
graphics::PreviewLoader::Status const status = loader.status(snippet);
string message;
switch (status) {
case graphics::PreviewLoader::InQueue:
case graphics::PreviewLoader::Processing:
message = _("Preview loading");
break;
case graphics::PreviewLoader::Ready:
message = _("Preview ready");
break;
case graphics::PreviewLoader::NotFound:
message = _("Preview failed");
break;
}
return message;
}
} // namespace anon
void RenderPreview::metrics(MetricsInfo & mi, Dimension & dim) const
{
if (previewReady()) {
dim.asc = pimage_->ascent();
dim.des = pimage_->descent();
dim.wid = pimage_->width();
} else {
dim.asc = 50;
dim.des = 0;
LyXFont font(mi.base.font);
font.setFamily(LyXFont::SANS_FAMILY);
font.setSize(LyXFont::SIZE_FOOTNOTE);
dim.wid = 15 +
font_metrics::width(statusMessage(mi.base.bv, snippet_),
font);
}
dim_ = dim;
}
void RenderPreview::draw(PainterInfo & pi, int x, int y) const
{
BOOST_ASSERT(pi.base.bv && pi.base.bv->buffer());
Buffer const & buffer = *pi.base.bv->buffer();
startLoading(buffer);
if (previewReady()) {
pi.pain.image(x, y - dim_.asc, dim_.wid, dim_.height(),
*(pimage_->image()));
return;
}
pi.pain.rectangle(x + InsetOld::TEXT_TO_INSET_OFFSET,
y - dim_.asc,
dim_.wid - 2 * InsetOld::TEXT_TO_INSET_OFFSET,
dim_.asc + dim_.des,
LColor::foreground);
LyXFont font(pi.base.font);
font.setFamily(LyXFont::SANS_FAMILY);
font.setSize(LyXFont::SIZE_FOOTNOTE);
pi.pain.text(x + InsetOld::TEXT_TO_INSET_OFFSET + 6,
y - font_metrics::maxAscent(font) - 4,
statusMessage(pi.base.bv, snippet_), font);
}
boost::signals::connection RenderPreview::connect(slot_type const & slot)
{
return preview_ready_signal_.connect(slot);
}
void RenderPreview::startLoading(Buffer const & buffer) const
{
if (!activated() && !snippet_.empty())
return;
graphics::Previews & previews = graphics::Previews::get();
graphics::PreviewLoader & loader = previews.loader(buffer);
loader.startLoading();
}
void RenderPreview::addPreview(string const & latex_snippet,
Buffer const & buffer)
{
if (!activated())
return;
graphics::Previews & previews = graphics::Previews::get();
graphics::PreviewLoader & loader = previews.loader(buffer);
addPreview(latex_snippet, loader);
}
void RenderPreview::addPreview(string const & latex_snippet,
graphics::PreviewLoader & ploader)
{
if (!activated())
return;
snippet_ = support::trim(latex_snippet);
pimage_ = 0;
if (snippet_.empty())
return;
pimage_ = ploader.preview(snippet_);
if (pimage_)
return;
// If this is the first time of calling, connect to the
// PreviewLoader signal that'll inform us when the preview image
// is ready for loading.
if (!ploader_connection_.connected()) {
ploader_connection_ = ploader.connect(
boost::bind(&RenderPreview::imageReady, this, _1));
}
ploader.add(snippet_);
}
void RenderPreview::removePreview(Buffer const & buffer)
{
if (snippet_.empty())
return;
graphics::Previews & previews = graphics::Previews::get();
graphics::PreviewLoader & loader = previews.loader(buffer);
loader.remove(snippet_);
snippet_.erase();
pimage_ = 0;
}
bool RenderPreview::previewReady() const
{
return pimage_ ? pimage_->image() : false;
}
void RenderPreview::imageReady(graphics::PreviewImage const & pimage)
{
// Check the current snippet is the same as that previewed.
if (snippet_ != pimage.snippet())
return;
pimage_ = &pimage;
preview_ready_signal_();
}
void RenderMonitoredPreview::setAbsFile(string const & file)
{
monitor_.reset(file);
}
void RenderMonitoredPreview::draw(PainterInfo & pi, int x, int y) const
{
RenderPreview::draw(pi, x, y);
if (!monitoring())
startMonitoring();
}
boost::signals::connection
RenderMonitoredPreview::fileChanged(slot_type const & slot)
{
return monitor_.connect(slot);
}