Module itextpdf
Package com.itextpdf.text.pdf

Class PdfLayer

  • All Implemented Interfaces:
    PdfOCG
    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.
    Author:
    Paulo Soares (psoares@consiste.pt)

    • Field Detail

      • children

        protected java.util.ArrayList children

      • title

        protected java.lang.String title

    • Constructor Detail

      • PdfLayer

        public PdfLayer​(java.lang.String name,
                PdfWriter writer)
        Creates a new layer.
        Parameters:
        name - the name of the layer
        writer - the writer

    • Method Detail

      • createTitle

        public static PdfLayer createTitle​(java.lang.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

      • 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 java.util.ArrayList 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

      • setName

        public void setName​(java.lang.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

      • setCreatorInfo

        public void setCreatorInfo​(java.lang.String creator,
                           java.lang.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​(java.lang.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​(java.lang.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

      • 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