THotPDF.AddStructureElement i pomoćne funkcije za Tagged PDF

Ova stranica dokumentuje trenutne pomoćne funkcije THotPDF za Tagged PDF i stabla strukture PDF/UA. Identifikatori koda odgovaraju javnim deklaracijama

Trenutni Delphi interfejs

function AddStructureElement(const Role: AnsiString; Parent: THPDFDictionaryObject;
  PageIndex: Integer = -1; MCID: Integer = -1): THPDFDictionaryObject; overload;
function AddStructureElement(const Role: AnsiString; Parent: THPDFDictionaryObject;
  PageIndex: Integer; MCID: Integer;
  const AltText: AnsiString; const ActualText: AnsiString): THPDFDictionaryObject; overload;
function AddStructureElement(const Role: AnsiString; Parent: THPDFDictionaryObject;
  PageIndex: Integer; MCID: Integer;
  const AltText: AnsiString; const ActualText: AnsiString;
  const IDStr: AnsiString): THPDFDictionaryObject; overload;
function AddStructureElement(T: THPDFStandardStructureType; Parent: THPDFDictionaryObject;
  PageIndex: Integer = -1; MCID: Integer = -1): THPDFDictionaryObject; overload;

procedure SetStructureElementLanguage(Elem: THPDFDictionaryObject; const Lang: AnsiString);
procedure SetStructureElementExpansionText(Elem: THPDFDictionaryObject; const ExpansionText: AnsiString);
procedure SetStructureElementTitle(Elem: THPDFDictionaryObject; const Title: AnsiString);
procedure AddStructRoleMap(const SourceRole: AnsiString; const TargetRole: AnsiString);

function BeginTaggedContent(const Role: AnsiString; Parent: THPDFDictionaryObject;
  const Lang: AnsiString = ''; const Alt: AnsiString = '';
  const ActualText: AnsiString = ''; const ExpansionText: AnsiString = ''): THPDFDictionaryObject;
procedure EndTaggedContent;

function EmitTaggedHeading(Level: Integer; Parent: THPDFDictionaryObject; X, Y: Single; const Text: WideString): THPDFDictionaryObject;
function BeginTaggedList(Parent: THPDFDictionaryObject; const NumberingStyle: AnsiString = 'None'): THPDFDictionaryObject;
function EmitTaggedListItem(ListElem: THPDFDictionaryObject; LblX, LblY: Single; const LabelText: WideString; BodyX, BodyY: Single; const BodyText: WideString): THPDFDictionaryObject;
function BeginTaggedTable(Parent: THPDFDictionaryObject): THPDFDictionaryObject;
function AddTaggedTableRow(TableElem: THPDFDictionaryObject): THPDFDictionaryObject;
function EmitTaggedTableHeader(TRElem: THPDFDictionaryObject; X, Y: Single; const Text: WideString; const Scope: AnsiString): THPDFDictionaryObject;
function EmitTaggedTableCell(TRElem: THPDFDictionaryObject; X, Y: Single; const Text: WideString): THPDFDictionaryObject;
function BeginTaggedFigure(Parent: THPDFDictionaryObject; const AltText: AnsiString; const BBox: array of Single): THPDFDictionaryObject;
procedure EndTaggedFigure;
procedure RegisterAnnotForStructure(AnnotDict: THPDFDictionaryObject; StructElem: THPDFDictionaryObject);

function StandardStructureTypeToName(T: THPDFStandardStructureType): AnsiString;
function IsStandardStructureType(const Name: AnsiString): Boolean;

Kreiranje elemenata strukture

AddStructureElement kreira rečnik /StructElem i dodaje ga kao dete elementa Parent; prosledite nil da ga povežete ispod korena stabla strukture. PageIndex povezuje element sa stranicom preko /Pg, dok negativna vrednost izostavlja tu vezu. MCID, kada je nula ili veći, povezuje marked-content sekvencu na stranici sa elementom i registruje je u dokumentnom /ParentTree. Overload sa šest argumenata dodaje /Alt za alternativni opis i /ActualText za zamenski tekst pri kopiranju. Overload sa sedam argumenata upisuje i dokumentno jedinstven /ID

Standardni tipovi strukture (Table 333)

Overload sa THPDFStandardStructureType je type-safe ulazna tačka: upisana uloga /S uvek je jedan od standardnih tipova strukture iz ISO 32000-1 §14.8.4 Table 333, čime se smanjuje rizik od grešaka u kucanju ili razlika u velikim i malim slovima u slobodnom tekstualnom role nazivu

Grupisanje: sstDocument, sstPart, sstArt, sstSect, sstDiv, sstBlockQuote, sstCaption, sstTOC, sstTOCI, sstIndex, sstNonStruct, sstPrivate
Blok nivo: sstH, sstH1-sstH6, sstP, sstL, sstLI, sstLbl, sstLBody, sstTable, sstTR, sstTH, sstTD, sstTHead, sstTBody, sstTFoot
Inline nivo: sstSpan, sstQuote, sstNote, sstReference, sstBibEntry, sstCode, sstLink, sstAnnot
Ruby i Warichu: sstRuby, sstRB, sstRT, sstRP, sstWarichu, sstWT, sstWP
Ilustracija: sstFigure, sstFormula, sstForm

Obratite pažnju na mala slova u sstLbl / sstLBody: stvarna imena PDF uloga su Lbl i LBody. Prilagođena imena uloga i dalje mogu da se proslede kroz overload AnsiString i mapiraju nazad na standardnu ulogu pomoću AddStructRoleMap

Primer

PDF.PDFUACompliance := pdfuaPDFUA1;
PDF.BeginDoc;
Doc := PDF.AddStructureElement(sstDocument, nil);
H1 := PDF.AddStructureElement(sstH1, Doc);
PDF.SetStructureElementLanguage(Doc, 'en-US');
PDF.SetStructureElementTitle(H1, 'Annual Report');
// Alt / ActualText ride on the AnsiString overload; reuse the
// spec-prescribed role name via StandardStructureTypeToName
Fig := PDF.AddStructureElement(StandardStructureTypeToName(sstFigure), Doc, 0, -1,
  'Sales by quarter: Q1 4.2M, Q2 5.1M, Q3 5.8M, Q4 6.4M', '');

Atributi strukture i mapiranje uloga

SetStructureElementLanguage upisuje BCP-47 override za /Lang, SetStructureElementExpansionText upisuje tekst proširenja /E, SetStructureElementTitle upisuje čitljiv naslov /T, a AddStructRoleMap mapira prilagođene strukturne uloge nazad na standardne PDF uloge. StandardStructureTypeToName vraća ime PDF uloge za vrednost THPDFStandardStructureType, a IsStandardStructureType proverava da li je ime uloge standardno

Pomoćne funkcije visokog nivoa za tagged sadržaj

EmitTaggedHeading, BeginTaggedList, EmitTaggedListItem, BeginTaggedTable, AddTaggedTableRow, EmitTaggedTableHeader, EmitTaggedTableCell, BeginTaggedFigure, EndTaggedFigure i RegisterAnnotForStructure pokrivaju uobičajeno PDF/UA povezivanje naslova, lista, tabela, figura i anotacija bez ručnog upravljanja MCID vrednostima

Tipičan tok rada

Uključite tagged output ili PDFUACompliance, kreirajte korenski element strukture, koristite pomoćne funkcije za semantički sadržaj i zatvorite svaku započetu tagged-content ili figure sekvencu pre EndDoc