lyx_mirror/src/graphics/GraphicsSupport.C

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/**
* \file GraphicsSupport.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>
#ifdef __GNUG__
#pragma implementation
#endif
#include "GraphicsSupport.h"
#include "BufferView.h"
#include "lyxtext.h"
#include "lyxrow.h"
#include "paragraph.h"
#include "frontends/Painter.h"
typedef std::list<VisibleParagraph> VPList;
VPList const getVisibleParagraphs(BufferView const & bv)
{
// top_y is not const because it's reset by getRowNearY.
int top_y = bv.text->first_y;
Row const * row = bv.text->getRowNearY(top_y);
int const bv_height = bv.painter().paperHeight();
VPList vps;
Row const * last_row = 0;
for (int height = 0; row && height < bv_height; row = row->next()) {
height += row->height();
if (vps.empty() || vps.back().par != row->par()) {
vps.push_back(VisibleParagraph(row->par(),
row->pos(),
row->par()->size()));
}
last_row = row;
}
// If the end of the final paragraph is not visble,
// update vps.back().end
if (last_row && last_row->next() &&
last_row->par() == last_row->next()->par()) {
vps.back().end = last_row->next()->pos();
}
return vps;
}
namespace {
struct InsetVisibleInParagraph {
InsetVisibleInParagraph(Inset const & inset) : inset_(inset) {}
bool operator()(VisibleParagraph const & vp)
{
Paragraph * par = vp.par;
InsetList::iterator it = par->insetlist.begin();
InsetList::iterator end = par->insetlist.end();
// Can't refactor this as a functor because we rely on the
// inset_iterator member function getPos().
for (; it != end; ++it) {
lyx::pos_type const pos = it.getPos();
if (pos >= vp.start && pos <= vp.end) {
if (it.getInset() == &inset_ ||
it.getInset()->getInsetFromID(inset_.id()) != 0)
return true;
}
}
return false;
}
private:
Inset const & inset_;
};
} // namespace anon
bool isInsetVisible(Inset const & inset, VPList const & vps)
{
if (vps.empty())
return false;
VPList::const_iterator it = vps.begin();
VPList::const_iterator end = vps.end();
it = std::find_if(it, end, InsetVisibleInParagraph(inset));
return it != end;
}