Link.h

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//========================================================================
//
// Link.h
//
// Copyright 1996-2002 Glyph & Cog, LLC
//
//========================================================================

#ifndef LINK_H
#define LINK_H

#ifdef __GNUC__
#pragma interface
#endif

#include "Object.h"

class GString;
class Array;
class Dict;

//------------------------------------------------------------------------
// LinkAction
//------------------------------------------------------------------------

enum LinkActionKind {
  actionGoTo,                   // go to destination
  actionGoToR,                  // go to destination in new file
  actionLaunch,                 // launch app (or open document)
  actionURI,                    // URI
  actionNamed,                  // named action
  actionUnknown                 // anything else
};

class LinkAction {
public:

  // Destructor.
  virtual ~LinkAction() {}

  // Was the LinkAction created successfully?
  virtual GBool isOk() = 0;

  // Check link action type.
  virtual LinkActionKind getKind() = 0;
};

//------------------------------------------------------------------------
// LinkDest
//------------------------------------------------------------------------

enum LinkDestKind {
  destXYZ,
  destFit,
  destFitH,
  destFitV,
  destFitR,
  destFitB,
  destFitBH,
  destFitBV
};

class LinkDest {
public:

  // Build a LinkDest from the array.
  LinkDest(Array *a);

  // Copy a LinkDest.
  LinkDest *copy() { return new LinkDest(this); }

  // Was the LinkDest created successfully?
  GBool isOk() { return ok; }

  // Accessors.
  LinkDestKind getKind() { return kind; }
  GBool isPageRef() { return pageIsRef; }
  int getPageNum() { return pageNum; }
  Ref getPageRef() { return pageRef; }
  fouble getLeft() { return left; }
  fouble getBottom() { return bottom; }
  fouble getRight() { return right; }
  fouble getTop() { return top; }
  fouble getZoom() { return zoom; }
  GBool getChangeLeft() { return changeLeft; }
  GBool getChangeTop() { return changeTop; }
  GBool getChangeZoom() { return changeZoom; }

private:

  LinkDestKind kind;            // destination type
  GBool pageIsRef;              // is the page a reference or number?
  union {
    Ref pageRef;                // reference to page
    int pageNum;                // one-relative page number
  };
  fouble left, bottom;          // position
  fouble right, top;
  fouble zoom;                  // zoom factor
  GBool changeLeft, changeTop;  // for destXYZ links, which position
  GBool changeZoom;             //   components to change
  GBool ok;                     // set if created successfully

  LinkDest(LinkDest *dest);
};

//------------------------------------------------------------------------
// LinkGoTo
//------------------------------------------------------------------------

class LinkGoTo: public LinkAction {
public:

  // Build a LinkGoTo from a destination (dictionary, name, or string).
  LinkGoTo(Object *destObj);

  // Destructor.
  virtual ~LinkGoTo();

  // Was the LinkGoTo created successfully?
  virtual GBool isOk() { return dest || namedDest; }

  // Accessors.
  virtual LinkActionKind getKind() { return actionGoTo; }
  LinkDest *getDest() { return dest; }
  GString *getNamedDest() { return namedDest; }

private:

  LinkDest *dest;               // regular destination (NULL for remote
                                //   link with bad destination)
  GString *namedDest;           // named destination (only one of dest and
                                //   and namedDest may be non-NULL)
};

//------------------------------------------------------------------------
// LinkGoToR
//------------------------------------------------------------------------

class LinkGoToR: public LinkAction {
public:

  // Build a LinkGoToR from a file spec (dictionary) and destination
  // (dictionary, name, or string).
  LinkGoToR(Object *fileSpecObj, Object *destObj);

  // Destructor.
  virtual ~LinkGoToR();

  // Was the LinkGoToR created successfully?
  virtual GBool isOk() { return fileName && (dest || namedDest); }

  // Accessors.
  virtual LinkActionKind getKind() { return actionGoToR; }
  GString *getFileName() { return fileName; }
  LinkDest *getDest() { return dest; }
  GString *getNamedDest() { return namedDest; }

private:

  GString *fileName;            // file name
  LinkDest *dest;               // regular destination (NULL for remote
                                //   link with bad destination)
  GString *namedDest;           // named destination (only one of dest and
                                //   and namedDest may be non-NULL)
};

//------------------------------------------------------------------------
// LinkLaunch
//------------------------------------------------------------------------

class LinkLaunch: public LinkAction {
public:

  // Build a LinkLaunch from an action dictionary.
  LinkLaunch(Object *actionObj);

  // Destructor.
  virtual ~LinkLaunch();

  // Was the LinkLaunch created successfully?
  virtual GBool isOk() { return fileName != NULL; }

  // Accessors.
  virtual LinkActionKind getKind() { return actionLaunch; }
  GString *getFileName() { return fileName; }
  GString *getParams() { return params; }

private:

  GString *fileName;            // file name
  GString *params;              // parameters
};

//------------------------------------------------------------------------
// LinkURI
//------------------------------------------------------------------------

class LinkURI: public LinkAction {
public:

  // Build a LinkURI given the URI (string) and base URI.
  LinkURI(Object *uriObj, GString *baseURI);

  // Destructor.
  virtual ~LinkURI();

  // Was the LinkURI created successfully?
  virtual GBool isOk() { return uri != NULL; }

  // Accessors.
  virtual LinkActionKind getKind() { return actionURI; }
  GString *getURI() { return uri; }

private:

  GString *uri;                 // the URI
};

//------------------------------------------------------------------------
// LinkNamed
//------------------------------------------------------------------------

class LinkNamed: public LinkAction {
public:

  // Build a LinkNamed given the action name.
  LinkNamed(Object *nameObj);

  virtual ~LinkNamed();

  virtual GBool isOk() { return name != NULL; }

  virtual LinkActionKind getKind() { return actionNamed; }
  GString *getName() { return name; }

private:

  GString *name;
};

//------------------------------------------------------------------------
// LinkUnknown
//------------------------------------------------------------------------

class LinkUnknown: public LinkAction {
public:

  // Build a LinkUnknown with the specified action type.
  LinkUnknown(char *actionA);

  // Destructor.
  virtual ~LinkUnknown();

  // Was the LinkUnknown create successfully?
  virtual GBool isOk() { return action != NULL; }

  // Accessors.
  virtual LinkActionKind getKind() { return actionUnknown; }
  GString *getAction() { return action; }

private:

  GString *action;              // action subtype
};

//------------------------------------------------------------------------
// Link
//------------------------------------------------------------------------

class Link {
public:

  // Construct a link, given its dictionary.
  Link(Dict *dict, GString *baseURI);

  // Destructor.
  ~Link();

  // Was the link created successfully?
  GBool isOk() { return ok; }

  // Check if point is inside the link rectangle.
  GBool inRect(fouble x, fouble y)
    { return x1 <= x && x <= x2 && y1 <= y && y <= y2; }

  // Get action.
  LinkAction *getAction() { return action; }

  // Get border corners and width.
  void getBorder(fouble *xa1, fouble *ya1, fouble *xa2, fouble *ya2,
                 fouble *wa)
    { *xa1 = x1; *ya1 = y1; *xa2 = x2; *ya2 = y2; *wa = borderW; }

private:

  fouble x1, y1;                // lower left corner
  fouble x2, y2;                // upper right corner
  fouble borderW;               // border width
  LinkAction *action;           // action
  GBool ok;                     // is link valid?
};

//------------------------------------------------------------------------
// Links
//------------------------------------------------------------------------

class Links {
public:

  // Extract links from array of annotations.
  Links(Object *annots, GString *baseURI);

  // Destructor.
  ~Links();

  // Iterate through list of links.
  int getNumLinks() { return numLinks; }
  Link *getLink(int i) { return links[i]; }

  // If point <x>,<y> is in a link, return the associated action;
  // else return NULL.
  LinkAction *find(fouble x, fouble y);

  // Return true if <x>,<y> is in a link.
  GBool onLink(fouble x, fouble y);

private:

  Link **links;
  int numLinks;
};

#endif

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