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## com.lowagie.text.pdf
Class PdfLayer

    java.lang.Object
      com.lowagie.text.pdf.PdfObject
          com.lowagie.text.pdf.PdfDictionary
              com.lowagie.text.pdf.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 Summary
`protected ArrayList` | `children`
`private boolean` | `on` Holds value of property on.
`private boolean` | `onPanel` Holds value of property onPanel.
`protected PdfLayer` | `parent`
`protected PdfIndirectReference` | `ref`
`protected String` | `title`

Fields inherited from class com.lowagie.text.pdf.PdfDictionary
`CATALOG, FONT, hashMap, OUTLINES, PAGE, PAGES`

Fields inherited from class com.lowagie.text.pdf.PdfObject
`ARRAY, BOOLEAN, bytes, DICTIONARY, INDIRECT, indRef, NAME, NOTHING, NULL, NUMBER, STREAM, STRING, TEXT_PDFDOCENCODING, TEXT_UNICODE, type`

Constructor Summary
`PdfLayer(String title)`
`PdfLayer(String name, PdfWriter writer)` Creates a new layer.

Method Summary
`void` | `addChild(PdfLayer child)` Adds a child layer.
`static PdfLayer` | `createTitle(String title, PdfWriter writer)` Creates a title layer.
`ArrayList` | `getChildren()` Gets the children layers.
`PdfLayer` | `getParent()` Gets the parent layer.
`PdfObject` | `getPdfObject()` Gets the dictionary representing the layer.
`PdfIndirectReference` | `getRef()` Gets the `PdfIndirectReference` that represents this layer.
`(package private) String` | `getTitle()`
`private PdfDictionary` | `getUsage()`
`boolean` | `isOn()` Gets the initial visibility of the layer.
`boolean` | `isOnPanel()` Gets the layer visibility in Acrobat's layer panel
`void` | `setCreatorInfo(String creator, String subtype)` Used by the creating application to store application-specific data associated with this optional content group.
`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).
`void` | `setLanguage(String lang, boolean preferred)` Specifies the language of the content controlled by this optional content group
`void` | `setName(String name)` Sets the name of this layer.
`void` | `setOn(boolean on)` Sets the initial visibility of the layer.
`void` | `setOnPanel(boolean onPanel)` Sets the visibility of the layer in Acrobat's layer panel.
`void` | `setPrint(String subtype, boolean printstate)` Specifies that the content in this group is intended for use in printing
`(package private) void` | `setRef(PdfIndirectReference ref)` Sets the `PdfIndirectReference` that represents this layer.
`void` | `setView(boolean view)` Indicates that the group should be set to that state when the document is opened in a viewer application.
`void` | `setZoom(float min, float max)` Specifies a range of magnifications at which the content in this optional content group is best viewed.

Methods inherited from class com.lowagie.text.pdf.PdfDictionary
`contains, get, getAsArray, getAsBoolean, getAsDict, getAsIndirectObject, getAsName, getAsNumber, getAsStream, getAsString, getDirectObject, getKeys, isCatalog, isFont, isOutlineTree, isPage, isPages, merge, mergeDifferent, put, putAll, putEx, remove, size, toPdf, toString`

Methods inherited from class com.lowagie.text.pdf.PdfObject
`canBeInObjStm, getBytes, getIndRef, isArray, isBoolean, isDictionary, isIndirect, isName, isNull, isNumber, isStream, isString, length, setContent, setIndRef, type`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

Field Detail

### ref

    protected PdfIndirectReference ref

### children

    protected ArrayList 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 Detail

### PdfLayer

    PdfLayer(String title)

### PdfLayer

    public PdfLayer(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(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 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

### 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

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