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// Copyright (c) 2005-2023 Jay Berkenbilt
//
// This file is part of qpdf.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Versions of qpdf prior to version 7 were released under the terms
// of version 2.0 of the Artistic License. At your option, you may
// continue to consider qpdf to be licensed under those terms. Please
// see the manual for additional information.
#ifndef QPDFANNOTATIONOBJECTHELPER_HH
#define QPDFANNOTATIONOBJECTHELPER_HH
#include <qpdf/Constants.h>
#include <qpdf/QPDFObjectHelper.hh>
#include <qpdf/DLL.h>
class QPDFAnnotationObjectHelper: public QPDFObjectHelper
{
public:
QPDF_DLL
QPDFAnnotationObjectHelper(QPDFObjectHandle);
QPDF_DLL
virtual ~QPDFAnnotationObjectHelper() = default;
// This class provides helper methods for annotations. More
// functionality will likely be added in the future.
// Some functionality for annotations is also implemented in
// QPDFAcroFormDocumentHelper and QPDFFormFieldObjectHelper. In
// some cases, functions defined there work for other annotations
// besides widget annotations, but they are implemented with form
// fields so that they can properly handle form fields when
// needed.
// Return the subtype of the annotation as a string (e.g.
// "/Widget"). Returns the empty string if the subtype (which is
// required by the spec) is missing.
QPDF_DLL
std::string getSubtype();
QPDF_DLL
QPDFObjectHandle::Rectangle getRect();
QPDF_DLL
QPDFObjectHandle getAppearanceDictionary();
// Return the appearance state as given in "/AS", or the empty
// string if none is given.
QPDF_DLL
std::string getAppearanceState();
// Return flags from "/F". The value is a logical or of
// pdf_annotation_flag_e as defined in qpdf/Constants.h.
QPDF_DLL
int getFlags();
// Return a specific stream. "which" may be one of "/N", "/R", or
// "/D" to indicate the normal, rollover, or down appearance
// stream. (Any value may be passed to "which"; if an appearance
// stream of that name exists, it will be returned.) If the value
// associated with "which" in the appearance dictionary is a
// subdictionary, an appearance state may be specified to select
// which appearance stream is desired. If not specified, the
// appearance state in "/AS" will used.
QPDF_DLL
QPDFObjectHandle getAppearanceStream(
std::string const& which, std::string const& state = "");
// Generate text suitable for addition to the containing page's
// content stream that draws this annotation's appearance stream
// as a form XObject. The value "name" is the resource name that
// will be used to refer to the form xobject. The value "rotate"
// should be set to the page's /Rotate value or 0 if none. The
// values of required_flags and forbidden_flags are constructed by
// logically "or"ing annotation flags of type
// pdf_annotation_flag_e defined in qpdf/Constants.h. Content will
// be returned only if all required_flags are set and no
// forbidden_flags are set. For example, including an_no_view in
// forbidden_flags could be useful for creating an on-screen view,
// and including an_print to required_flags could be useful if
// preparing to print.
QPDF_DLL
std::string getPageContentForAppearance(
std::string const& name,
int rotate,
int required_flags = 0,
int forbidden_flags = an_invisible | an_hidden);
private:
class Members
{
friend class QPDFAnnotationObjectHelper;
public:
QPDF_DLL
~Members() = default;
private:
Members() = default;
Members(Members const&) = delete;
};
std::shared_ptr<Members> m;
};
#endif // QPDFANNOTATIONOBJECTHELPER_HH
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