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//========================================================================
//
// OptionalContent.h
//
// Copyright 2008 Glyph & Cog, LLC
//
//========================================================================
#ifndef OPTIONALCONTENT_H
#define OPTIONALCONTENT_H
#include <aconf.h>
#ifdef USE_GCC_PRAGMAS
#pragma interface
#endif
#include "gtypes.h"
#include "Object.h"
#include "CharTypes.h"
class GString;
class GList;
class PDFDoc;
class XRef;
class OptionalContentGroup;
class OCDisplayNode;
//------------------------------------------------------------------------
class OptionalContent {
public:
OptionalContent(PDFDoc *doc);
~OptionalContent();
// Walk the list of optional content groups.
int getNumOCGs();
OptionalContentGroup *getOCG(int idx);
// Find an OCG by indirect reference.
OptionalContentGroup *findOCG(Ref *ref);
// Get the root node of the optional content group display tree
// (which does not necessarily include all of the OCGs).
OCDisplayNode *getDisplayRoot() { return display; }
// Evaluate an optional content object -- either an OCG or an OCMD.
// If <obj> is a valid OCG or OCMD, sets *<visible> and returns
// true; otherwise returns false.
GBool evalOCObject(Object *obj, GBool *visible);
private:
GBool evalOCVisibilityExpr(Object *expr, int recursion);
XRef *xref;
GList *ocgs; // all OCGs [OptionalContentGroup]
OCDisplayNode *display; // root node of display tree
};
//------------------------------------------------------------------------
// Values from the optional content usage dictionary.
enum OCUsageState {
ocUsageOn,
ocUsageOff,
ocUsageUnset
};
//------------------------------------------------------------------------
class OptionalContentGroup {
public:
static OptionalContentGroup *parse(Ref *refA, Object *obj);
~OptionalContentGroup();
GBool matches(Ref *refA);
Unicode *getName() { return name; }
int getNameLength() { return nameLen; }
OCUsageState getViewState() { return viewState; }
OCUsageState getPrintState() { return printState; }
GBool getState() { return state; }
void setState(GBool stateA) { state = stateA; }
private:
OptionalContentGroup(Ref *refA, Unicode *nameA, int nameLenA,
OCUsageState viewStateA, OCUsageState printStateA);
Ref ref;
Unicode *name;
int nameLen;
OCUsageState viewState, // suggested state when viewing
printState; // suggested state when printing
GBool state; // current state (on/off)
};
//------------------------------------------------------------------------
class OCDisplayNode {
public:
static OCDisplayNode *parse(Object *obj, OptionalContent *oc, XRef *xref,
int recursion = 0);
OCDisplayNode();
~OCDisplayNode();
Unicode *getName() { return name; }
int getNameLength() { return nameLen; }
OptionalContentGroup *getOCG() { return ocg; }
int getNumChildren();
OCDisplayNode *getChild(int idx);
private:
OCDisplayNode(GString *nameA);
OCDisplayNode(OptionalContentGroup *ocgA);
void addChild(OCDisplayNode *child);
void addChildren(GList *childrenA);
GList *takeChildren();
Unicode *name; // display name (may be NULL)
int nameLen;
OptionalContentGroup *ocg; // NULL for display labels
GList *children; // NULL if there are no children
// [OCDisplayNode]
};
#endif
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