org.apache.fop.area

## Class RegionReference

- java.lang.Object
- - org.apache.fop.area.AreaTreeObject
  - - org.apache.fop.area.Area
    - - org.apache.fop.area.RegionReference

- All Implemented Interfaces:
    java.io.Serializable, java.lang.Cloneable
  Direct Known Subclasses:
    BodyRegion

      public class RegionReference
      extends Area

  This is a region reference area for a page regions. This area is the direct child of a region-viewport-area. It is cloneable so the page master can make copies from the original page and regions.
  See Also:
    Serialized Form

- - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `protected RegionViewport` | `regionViewport` the parent `RegionViewport` for this object

    - ### Fields inherited from class org.apache.fop.area.Area

      `bidiLevel, bpd, CLASS_ABSOLUTE, CLASS_BEFORE_FLOAT, CLASS_FIXED, CLASS_FOOTNOTE, CLASS_MAX, CLASS_NORMAL, CLASS_SIDE_FLOAT, effectiveIPD, ipd, log, ORIENT_0, ORIENT_180, ORIENT_270, ORIENT_90, traits`

    - ### Fields inherited from class org.apache.fop.area.AreaTreeObject

      `extensionAttachments, foreignAttributes`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `RegionReference(int regionClass, java.lang.String regionName, RegionViewport parent)` Create a new region reference area.
    `RegionReference(Region regionFO, RegionViewport parent)` Create a new region reference area.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addBlock(Block block)` Add a block area to this region reference area.
    `void` | `addChildArea(Area child)` Add a child to this area.
    `java.lang.Object` | `clone()`
    `java.util.List<Area>` | `getBlocks()` Get the block in this region.
    `CTM` | `getCTM()` Get the current transform of this region.
    `int` | `getRegionClass()` Get the region class of this region.
    `java.lang.String` | `getRegionName()`
    `RegionViewport` | `getRegionViewport()`
    `boolean` | `isEmpty()` indicates whether the main reference area has any child areas added to it
    `void` | `setCTM(CTM ctm)` Set the Coordinate Transformation Matrix which transforms content coordinates in this region reference area which are specified in terms of "start" and "before" into coordinates in a system which is positioned in "absolute" directions (with origin at lower left of the region reference area.
    `java.lang.String` | `toString()`

    - ### Methods inherited from class org.apache.fop.area.Area

      `activateEffectiveIPD, addTrait, getAllocBPD, getAllocIPD, getAreaClass, getBidiLevel, getBorderAndPaddingWidthAfter, getBorderAndPaddingWidthBefore, getBorderAndPaddingWidthEnd, getBorderAndPaddingWidthStart, getBPD, getChangeBarList, getEffectiveAllocIPD, getEffectiveIPD, getIPD, getSpaceAfter, getSpaceBefore, getSpaceEnd, getSpaceStart, getTrait, getTraitAsBoolean, getTraitAsInteger, getTraits, hasTrait, hasTraits, resetBidiLevel, setAreaClass, setBidiLevel, setBPD, setChangeBarList, setIPD, setTraits, setWritingModeTraits`

    - ### Methods inherited from class org.apache.fop.area.AreaTreeObject

      `addExtensionAttachment, getExtensionAttachments, getForeignAttributes, getForeignAttributeValue, hasExtensionAttachments, setExtensionAttachments, setForeignAttribute, setForeignAttributes`

    - ### Methods inherited from class java.lang.Object

      `equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Field Detail

    - #### regionViewport

          protected RegionViewport regionViewport

      the parent `RegionViewport` for this object

  - ### Constructor Detail

    - #### RegionReference

          public RegionReference(Region regionFO,
                                 RegionViewport parent)

      Create a new region reference area.
      Parameters:
        `regionFO` - the region.
        `parent` - the viewport for this region.

    - #### RegionReference

          public RegionReference(int regionClass,
                                 java.lang.String regionName,
                                 RegionViewport parent)

      Create a new region reference area.
      Parameters:
        `regionClass` - the region class (as returned by Region.getNameId())
        `regionName` - the name of the region (as returned by Region.getRegionName())
        `parent` - the viewport for this region.

  - ### Method Detail

    - #### addChildArea

          public void addChildArea(Area child)

      Add a child to this area. The default is to do nothing. Subclasses must override to do something if they can have child areas.
      Overrides:
        `addChildArea` in class `Area`
      Parameters:
        `child` - the child area to add

    - #### setCTM

          public void setCTM(CTM ctm)

      Set the Coordinate Transformation Matrix which transforms content coordinates in this region reference area which are specified in terms of "start" and "before" into coordinates in a system which is positioned in "absolute" directions (with origin at lower left of the region reference area.
      Parameters:
        `ctm` - the current transform to position this region

    - #### getRegionViewport

          public RegionViewport getRegionViewport()

      Returns:
        Returns the parent RegionViewport.

    - #### getCTM

          public CTM getCTM()

      Get the current transform of this region.
      Returns:
        ctm the current transform to position this region

    - #### getBlocks

          public java.util.List<Area> getBlocks()

      Get the block in this region.
      Returns:
        the list of blocks in this region

    - #### getRegionClass

          public int getRegionClass()

      Get the region class of this region.
      Returns:
        the region class

    - #### getRegionName

          public java.lang.String getRegionName()

      Returns:
        the region name

    - #### addBlock

          public void addBlock(Block block)

      Add a block area to this region reference area.
      Parameters:
        `block` - the block area to add

    - #### isEmpty

          public boolean isEmpty()

      indicates whether the main reference area has any child areas added to it
      Returns:
        whether the main reference area has any child areas added to it

    - #### clone

          public java.lang.Object clone()
                                 throws java.lang.CloneNotSupportedException

      Overrides:
        `clone` in class `Area`
      Throws:
        `java.lang.CloneNotSupportedException`

    - #### toString

          public java.lang.String toString()

      Overrides:
        `toString` in class `Area`
      Returns:
        ipd and bpd of area

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