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/*************************************************************************
** HyperlinkManager.hpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2023 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU General Public License as **
** published by the Free Software Foundation; either version 3 of **
** the License, or (at your option) any later version. **
** **
** This program is distributed in the hope that it will be useful, but **
** WITHOUT ANY WARRANTY; without even the implied warranty of **
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
** GNU General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#ifndef HYPERLINKMANAGER_HPP
#define HYPERLINKMANAGER_HPP
#include <string>
#include <unordered_map>
#include "Color.hpp"
#include "SpecialActions.hpp"
class SpecialActions;
class HyperlinkManager {
struct NamedAnchor {
NamedAnchor () : pageno(0), id(0), pos(0), referenced(false) {}
NamedAnchor (unsigned pn, int i, double p, bool r=false) : pageno(pn), id(i), pos(p), referenced(r) {}
unsigned pageno; ///< page number where the anchor is located
int id; ///< unique numerical ID (< 0 if anchor is undefined yet)
double pos; ///< vertical position of named anchor (in PS point units)
bool referenced; ///< true if a reference to this anchor exists
};
enum class AnchorType {NONE, HREF, NAME};
enum class ColorSource {DEFAULT, LINKMARKER, STATIC};
using NamedAnchors = std::unordered_map<std::string, NamedAnchor>;
public:
HyperlinkManager (const HyperlinkManager&) =delete;
HyperlinkManager (HyperlinkManager&&) =delete;
void addHrefAnchor (const std::string &uri);
void addNameAchor (const std::string &name, int pageno);
void setActiveNameAnchor (const std::string &name, SpecialActions &actions);
void closeAnchor (SpecialActions &actions);
void checkNewLine (SpecialActions &actions);
void createLink (std::string uri, SpecialActions &actions);
void createViews (unsigned pageno, SpecialActions &actions);
void setBaseUrl (const std::string &base) {_base = base;}
void setLineWidth (double w) {_linewidth = w;}
static HyperlinkManager& instance ();
static bool setLinkMarker (const std::string &marker);
static void setDefaultLinkColor (Color color);
protected:
HyperlinkManager () =default;
void markLinkedBox (SpecialActions &actions);
enum class MarkerType {NONE, LINE, BOX, BGCOLOR};
static MarkerType MARKER_TYPE; ///< selects how to mark linked areas
static Color LINK_BGCOLOR; ///< background color if linkmark type == LT_BGCOLOR
static Color LINK_LINECOLOR; ///< line color if linkmark type is LM_LINE or LM_BOX
static ColorSource COLORSOURCE; ///< if true, LINK_LINECOLOR is applied
private:
AnchorType _anchorType=AnchorType::NONE; ///< type of active anchor
int _depthThreshold=0; ///< break anchor box if the DVI stack depth underruns this threshold
double _linewidth=-1; ///< line width of link marker (-1 => compute individual value per link)
std::string _base; ///< base URL that is prepended to all relative targets
NamedAnchors _namedAnchors; ///< information about all named anchors processed
};
#endif
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