Class PdfLayer

java.lang.Object
com.itextpdf.text.pdf.PdfObject
com.itextpdf.text.pdf.PdfDictionary
com.itextpdf.text.pdf.PdfLayer
All Implemented Interfaces:
PdfOCG, Serializable
public class PdfLayer extends PdfDictionary implements PdfOCG
An optional content group is a dictionary representing a collection of graphics that can be made visible or invisible dynamically by users of viewer applications. In iText they are referenced as layers.
See Also:

  • Field Details

    • ref

      protected PdfIndirectReference ref

    • children

      protected ArrayList<PdfLayer> children

    • parent

      protected PdfLayer parent

    • title

      protected String title

    • on

      private boolean on
      Holds value of property on.

    • onPanel

      private boolean onPanel
      Holds value of property onPanel.

  • Constructor Details

  • Method Details

    • createTitle

      public static PdfLayer createTitle(String title, PdfWriter writer)
      Creates a title layer. A title layer is not really a layer but a collection of layers under the same title heading.
      Parameters:
      title - the title text
      writer - the PdfWriter
      Returns:
      the title layer

    • getTitle

      String getTitle()

    • addChild

      public void addChild(PdfLayer child)
      Adds a child layer. Nested layers can only have one parent.
      Parameters:
      child - the child layer

    • getParent

      public PdfLayer getParent()
      Gets the parent layer.
      Returns:
      the parent layer or null if the layer has no parent

    • getChildren

      public ArrayList<PdfLayer> getChildren()
      Gets the children layers.
      Returns:
      the children layers or null if the layer has no children

    • getRef

      public PdfIndirectReference getRef()
      Gets the PdfIndirectReference that represents this layer.
      Specified by:
      getRef in interface PdfOCG
      Returns:
      the PdfIndirectReference that represents this layer

    • setRef

      void setRef(PdfIndirectReference ref)
      Sets the PdfIndirectReference that represents this layer. This can only be done from PdfStamperImp.
      Parameters:
      ref - The reference to the OCG object
      Since:
      2.1.2

    • setName

      public void setName(String name)
      Sets the name of this layer.
      Parameters:
      name - the name of this layer

    • getPdfObject

      public PdfObject getPdfObject()
      Gets the dictionary representing the layer. It just returns this.
      Specified by:
      getPdfObject in interface PdfOCG
      Returns:
      the dictionary representing the layer

    • isOn

      public boolean isOn()
      Gets the initial visibility of the layer.
      Returns:
      the initial visibility of the layer

    • setOn

      public void setOn(boolean on)
      Sets the initial visibility of the layer.
      Parameters:
      on - the initial visibility of the layer

    • getUsage

      private PdfDictionary getUsage()

    • setCreatorInfo

      public void setCreatorInfo(String creator, String subtype)
      Used by the creating application to store application-specific data associated with this optional content group.
      Parameters:
      creator - a text string specifying the application that created the group
      subtype - a string defining the type of content controlled by the group. Suggested values include but are not limited to Artwork, for graphic-design or publishing applications, and Technical, for technical designs such as building plans or schematics

    • setLanguage

      public void setLanguage(String lang, boolean preferred)
      Specifies the language of the content controlled by this optional content group
      Parameters:
      lang - a language string which specifies a language and possibly a locale (for example, es-MX represents Mexican Spanish)
      preferred - used by viewer applications when there is a partial match but no exact match between the system language and the language strings in all usage dictionaries

    • setExport

      public void setExport(boolean export)
      Specifies the recommended state for content in this group when the document (or part of it) is saved by a viewer application to a format that does not support optional content (for example, an earlier version of PDF or a raster image format).
      Parameters:
      export - the export state

    • setZoom

      public void setZoom(float min, float max)
      Specifies a range of magnifications at which the content in this optional content group is best viewed.
      Parameters:
      min - the minimum recommended magnification factors at which the group should be ON. A negative value will set the default to 0
      max - the maximum recommended magnification factor at which the group should be ON. A negative value will set the largest possible magnification supported by the viewer application

    • setPrint

      public void setPrint(String subtype, boolean printstate)
      Specifies that the content in this group is intended for use in printing
      Parameters:
      subtype - a name specifying the kind of content controlled by the group; for example, Trapping, PrintersMarks and Watermark
      printstate - indicates that the group should be set to that state when the document is printed from a viewer application

    • setView

      public void setView(boolean view)
      Indicates that the group should be set to that state when the document is opened in a viewer application.
      Parameters:
      view - the view state

    • setPageElement

      public void setPageElement(String pe)
      Indicates that the group contains a pagination artifact.
      Parameters:
      pe - one of the following names: "HF" (Header Footer), "FG" (Foreground), "BG" (Background), or "L" (Logo).
      Since:
      5.0.2

    • setUser

      public void setUser(String type, String... names)
      One of more users for whom this optional content group is primarily intended.
      Parameters:
      type - should be "Ind" (Individual), "Ttl" (Title), or "Org" (Organization).
      names - one or more names
      Since:
      5.0.2

    • isOnPanel

      public boolean isOnPanel()
      Gets the layer visibility in Acrobat's layer panel
      Returns:
      the layer visibility in Acrobat's layer panel

    • setOnPanel

      public void setOnPanel(boolean onPanel)
      Sets the visibility of the layer in Acrobat's layer panel. If false the layer cannot be directly manipulated by the user. Note that any children layers will also be absent from the panel.
      Parameters:
      onPanel - the visibility of the layer in Acrobat's layer panel