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103 lines
2.1 KiB
C++
103 lines
2.1 KiB
C++
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/**
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* \file GraphicsSupport.C
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* Copyright 2002 the LyX Team
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* Read the file COPYING
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*
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* \author Angus Leeming <leeming@lyx.org>
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*/
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#include <config.h>
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#ifdef __GNUG__
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#pragma implementation
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#endif
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#include "GraphicsSupport.h"
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#include "BufferView.h"
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#include "lyxtext.h"
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#include "lyxrow.h"
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#include "paragraph.h"
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#include "frontends/Painter.h"
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typedef std::list<VisibleParagraph> VPList;
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VPList const getVisibleParagraphs(BufferView const & bv)
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{
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// top_y is not const because it's reset by getRowNearY.
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int top_y = bv.text->first_y;
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Row const * row = bv.text->getRowNearY(top_y);
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int const bv_height = bv.painter().paperHeight();
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VPList vps;
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Row const * last_row = 0;
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for (int height = 0; row && height < bv_height; row = row->next()) {
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height += row->height();
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if (vps.empty() || vps.back().par != row->par()) {
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vps.push_back(VisibleParagraph(row->par(),
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row->pos(),
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row->par()->size()));
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}
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last_row = row;
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}
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// If the end of the final paragraph is not visble,
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// update vps.back().end
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if (last_row && last_row->next() &&
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last_row->par() == last_row->next()->par()) {
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vps.back().end = last_row->next()->pos();
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}
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return vps;
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}
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namespace {
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struct InsetVisibleInParagraph {
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InsetVisibleInParagraph(Inset const & inset) : inset_(inset) {}
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bool operator()(VisibleParagraph const & vp)
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{
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Paragraph * par = vp.par;
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Paragraph::inset_iterator it = par->inset_iterator_begin();
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Paragraph::inset_iterator end = par->inset_iterator_end();
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// Can't refactor this as a functor because we rely on the
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// inset_iterator member function getPos().
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for (; it != end; ++it) {
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lyx::pos_type const pos = it.getPos();
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if (pos >= vp.start && pos <= vp.end) {
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if (*it == &inset_ ||
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it->getInsetFromID(inset_.id()) != 0)
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return true;
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}
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}
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return false;
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}
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private:
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Inset const & inset_;
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};
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} // namespace anon
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bool isInsetVisible(Inset const & inset, VPList const & vps)
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{
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if (vps.empty())
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return false;
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VPList::const_iterator it = vps.begin();
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VPList::const_iterator end = vps.end();
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it = std::find_if(it, end, InsetVisibleInParagraph(inset));
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return it != end;
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}
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