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## org.apache.fop.layoutmgr
Class AbstractLayoutManager

    java.lang.Object
      org.apache.fop.layoutmgr.AbstractBaseLayoutManager
          org.apache.fop.layoutmgr.AbstractLayoutManager

All Implemented Interfaces:
  Constants, LayoutManager, PercentBaseContext

Direct Known Subclasses:
  AbstractPageSequenceLayoutManager, BlockStackingLayoutManager, InlineStackingLayoutManager, LeafNodeLayoutManager

public abstract class AbstractLayoutManager
extends AbstractBaseLayoutManager
implements Constants

The base class for most LayoutManagers.

Field Summary
`protected java.util.ListIterator` | `childLMiter` child LM iterator during getNextKnuthElement phase
`protected java.util.List` | `childLMs` List of child LayoutManagers
`protected LayoutManager` | `curChildLM` child LM during getNextKnuthElement phase
`protected java.util.ListIterator` | `fobjIter` Iterator for child LayoutManagers
`protected LayoutManager` | `parentLayoutManager` Parent LayoutManager for this LayoutManager

Fields inherited from class org.apache.fop.layoutmgr.AbstractBaseLayoutManager
`fobj, generatesBlockArea, generatesReferenceArea`

Fields inherited from interface org.apache.fop.fo.Constants
`COMPOUND_COUNT, COMPOUND_MASK, COMPOUND_SHIFT, CP_BLOCK_PROGRESSION_DIRECTION, CP_CONDITIONALITY, CP_INLINE_PROGRESSION_DIRECTION, CP_LENGTH, CP_MAXIMUM, CP_MINIMUM, CP_OPTIMUM, CP_PRECEDENCE, CP_WITHIN_COLUMN, CP_WITHIN_LINE, CP_WITHIN_PAGE, EN_100, EN_200, EN_300, EN_400, EN_500, EN_600, EN_700, EN_800, EN_900, EN_ABSOLUTE, EN_ABSOLUTE_COLORMETRIC, EN_AFTER, EN_AFTER_EDGE, EN_ALL, EN_ALPHABETIC, EN_ALTERNATE, EN_ALWAYS, EN_ANY, EN_AUTO, EN_AUTO_EVEN, EN_AUTO_ODD, EN_AVOID, EN_BACKSLANT, EN_BASELINE, EN_BEFORE, EN_BEFORE_EDGE, EN_BIDI_OVERRIDE, EN_BLANK, EN_BLINK, EN_BLOCK, EN_BOLDER, EN_BOTH, EN_BOTTOM, EN_BOUNDED_IN_ONE_DIMENSION, EN_CAPITALIZE, EN_CAPTION, EN_CENTER, EN_CENTRAL, EN_CHARACTER_BY_CHARACTER, EN_COLLAPSE, EN_COLLAPSE_WITH_PRECEDENCE, EN_COLUMN, EN_CONDENSED, EN_CONSIDER_SHIFTS, EN_DASHED, EN_DISCARD, EN_DISREGARD_SHIFTS, EN_DOCUMENT, EN_DOTS, EN_DOTTED, EN_DOUBLE, EN_EMBED, EN_END, EN_END_ON_EVEN, EN_END_ON_ODD, EN_ERROR_IF_OVERFLOW, EN_EVEN, EN_EVEN_PAGE, EN_EXPANDED, EN_EXTRA_CONDENSED, EN_EXTRA_EXPANDED, EN_FALSE, EN_FIC, EN_FIRST, EN_FIRST_STARTING, EN_FIXED, EN_FONT_HEIGHT, EN_FORCE, EN_FSWP, EN_GROOVE, EN_HANGING, EN_HIDDEN, EN_HIDE, EN_ICON, EN_IDEOGRAPHIC, EN_IGNORE, EN_IGNORE_IF_AFTER_LINEFEED, EN_IGNORE_IF_BEFORE_LINEFEED, EN_IGNORE_IF_SURROUNDING_LINEFEED, EN_INDEFINITE, EN_INDENT, EN_INHERIT, EN_INSET, EN_INSIDE, EN_INTEGER_PIXELS, EN_ITALIC, EN_JUSTIFY, EN_LARGER, EN_LAST, EN_LAST_ENDING, EN_LAST_STARTING, EN_LEAVE_SEPARATE, EN_LEFT, EN_LEWP, EN_LIGHTER, EN_LINE, EN_LINE_HEIGHT, EN_LINE_THROUGH, EN_LINK, EN_LOWERCASE, EN_LR_TB, EN_LSWP, EN_LTR, EN_MATHEMATICAL, EN_MAX_HEIGHT, EN_MENU, EN_MERGE, EN_MESSAGE_BOX, EN_MIDDLE, EN_NARROWER, EN_NEW, EN_NO_BLINK, EN_NO_CHANGE, EN_NO_FORCE, EN_NO_LIMIT, EN_NO_LINE_THROUGH, EN_NO_LINK, EN_NO_OVERLINE, EN_NO_UNDERLINE, EN_NO_WRAP, EN_NON_UNIFORM, EN_NONE, EN_NOREPEAT, EN_NORMAL, EN_NOT_BLANK, EN_OBLIQUE, EN_ODD, EN_ODD_PAGE, EN_ONLY, EN_OUTSET, EN_OUTSIDE, EN_OVERLINE, EN_PAGE, EN_PAGE_SEQUENCE, EN_PAGINATE, EN_PERCEPTUAL, EN_PRE, EN_PRESERVE, EN_REFERENCE_AREA, EN_RELATIVE, EN_RELATIVE_COLOMETRIC, EN_REPEAT, EN_REPEATX, EN_REPEATY, EN_REPLACE, EN_RESAMPLE_ANY_METHOD, EN_RESET_SIZE, EN_REST, EN_RETAIN, EN_RIDGE, EN_RIGHT, EN_RL_TB, EN_RTL, EN_RULE, EN_SATURATION, EN_SCALE_DOWN_TO_FIT, EN_SCALE_TO_FIT, EN_SCALE_UP_TO_FIT, EN_SCROLL, EN_SEMI_CONDENSED, EN_SEMI_EXPANDED, EN_SEPARATE, EN_SHOW, EN_SMALL_CAPS, EN_SMALL_CAPTION, EN_SMALLER, EN_SOLID, EN_SPACE, EN_START, EN_STATIC, EN_STATUS_BAR, EN_SUB, EN_SUPER, EN_SUPPRESS, EN_TABLE, EN_TABLE_FRAGMENT, EN_TB_RL, EN_TEXT_AFTER_EDGE, EN_TEXT_BEFORE_EDGE, EN_TEXT_BOTTOM, EN_TEXT_TOP, EN_TOP, EN_TRADITIONAL, EN_TREAT_AS_SPACE, EN_TREAT_AS_ZERO_WIDTH_SPACE, EN_TRUE, EN_ULTRA_CONDENSED, EN_ULTRA_EXPANDED, EN_UNBOUNDED, EN_UNDERLINE, EN_UNIFORM, EN_UPPERCASE, EN_USE_FONT_METRICS, EN_USE_SCRIPT, EN_USECONTENT, EN_VISIBLE, EN_WIDER, EN_WRAP, EN_X_DISTRIBUTE, EN_X_FILL, ENUM_COUNT, FO_BASIC_LINK, FO_BIDI_OVERRIDE, FO_BLOCK, FO_BLOCK_CONTAINER, FO_BOOKMARK, FO_BOOKMARK_TITLE, FO_BOOKMARK_TREE, FO_CHANGE_BAR_BEGIN, FO_CHANGE_BAR_END, FO_CHARACTER, FO_COLOR_PROFILE, FO_CONDITIONAL_PAGE_MASTER_REFERENCE, FO_DECLARATIONS, FO_EXTERNAL_GRAPHIC, FO_FLOAT, FO_FLOW, FO_FLOW_ASSIGNMENT, FO_FLOW_MAP, FO_FLOW_NAME_SPECIFIER, FO_FLOW_SOURCE_LIST, FO_FLOW_TARGET_LIST, FO_FOLIO_PREFIX, FO_FOLIO_SUFFIX, FO_FOOTNOTE, FO_FOOTNOTE_BODY, FO_INDEX_KEY_REFERENCE, FO_INDEX_PAGE_CITATION_LIST, FO_INDEX_PAGE_CITATION_LIST_SEPARATOR, FO_INDEX_PAGE_CITATION_RANGE_SEPARATOR, FO_INDEX_PAGE_NUMBER_PREFIX, FO_INDEX_PAGE_NUMBER_SUFFIX, FO_INDEX_RANGE_BEGIN, FO_INDEX_RANGE_END, FO_INITIAL_PROPERTY_SET, FO_INLINE, FO_INLINE_CONTAINER, FO_INSTREAM_FOREIGN_OBJECT, FO_LAYOUT_MASTER_SET, FO_LEADER, FO_LIST_BLOCK, FO_LIST_ITEM, FO_LIST_ITEM_BODY, FO_LIST_ITEM_LABEL, FO_MARKER, FO_MULTI_CASE, FO_MULTI_PROPERTIES, FO_MULTI_PROPERTY_SET, FO_MULTI_SWITCH, FO_MULTI_TOGGLE, FO_PAGE_NUMBER, FO_PAGE_NUMBER_CITATION, FO_PAGE_NUMBER_CITATION_LAST, FO_PAGE_SEQUENCE, FO_PAGE_SEQUENCE_MASTER, FO_PAGE_SEQUENCE_WRAPPER, FO_REGION_AFTER, FO_REGION_BEFORE, FO_REGION_BODY, FO_REGION_END, FO_REGION_NAME_SPECIFIER, FO_REGION_START, FO_REPEATABLE_PAGE_MASTER_ALTERNATIVES, FO_REPEATABLE_PAGE_MASTER_REFERENCE, FO_RETRIEVE_MARKER, FO_RETRIEVE_TABLE_MARKER, FO_ROOT, FO_SCALING_VALUE_CITATION, FO_SIMPLE_PAGE_MASTER, FO_SINGLE_PAGE_MASTER_REFERENCE, FO_STATIC_CONTENT, FO_TABLE, FO_TABLE_AND_CAPTION, FO_TABLE_BODY, FO_TABLE_CAPTION, FO_TABLE_CELL, FO_TABLE_COLUMN, FO_TABLE_FOOTER, FO_TABLE_HEADER, FO_TABLE_ROW, FO_TITLE, FO_UNKNOWN_NODE, FO_WRAPPER, FRM_OBJ_COUNT, NOT_SET, PR_ABSOLUTE_POSITION, PR_ACTIVE_STATE, PR_ALIGNMENT_ADJUST, PR_ALIGNMENT_BASELINE, PR_AUTO_RESTORE, PR_AZIMUTH, PR_BACKGROUND, PR_BACKGROUND_ATTACHMENT, PR_BACKGROUND_COLOR, PR_BACKGROUND_IMAGE, PR_BACKGROUND_POSITION, PR_BACKGROUND_POSITION_HORIZONTAL, PR_BACKGROUND_POSITION_VERTICAL, PR_BACKGROUND_REPEAT, PR_BASELINE_SHIFT, PR_BLANK_OR_NOT_BLANK, PR_BLOCK_PROGRESSION_DIMENSION, PR_BORDER, PR_BORDER_AFTER_COLOR, PR_BORDER_AFTER_PRECEDENCE, PR_BORDER_AFTER_STYLE, PR_BORDER_AFTER_WIDTH, PR_BORDER_BEFORE_COLOR, PR_BORDER_BEFORE_PRECEDENCE, PR_BORDER_BEFORE_STYLE, PR_BORDER_BEFORE_WIDTH, PR_BORDER_BOTTOM, PR_BORDER_BOTTOM_COLOR, PR_BORDER_BOTTOM_STYLE, PR_BORDER_BOTTOM_WIDTH, PR_BORDER_COLLAPSE, PR_BORDER_COLOR, PR_BORDER_END_COLOR, PR_BORDER_END_PRECEDENCE, PR_BORDER_END_STYLE, PR_BORDER_END_WIDTH, PR_BORDER_LEFT, PR_BORDER_LEFT_COLOR, PR_BORDER_LEFT_STYLE, PR_BORDER_LEFT_WIDTH, PR_BORDER_RIGHT, PR_BORDER_RIGHT_COLOR, PR_BORDER_RIGHT_STYLE, PR_BORDER_RIGHT_WIDTH, PR_BORDER_SEPARATION, PR_BORDER_SPACING, PR_BORDER_START_COLOR, PR_BORDER_START_PRECEDENCE, PR_BORDER_START_STYLE, PR_BORDER_START_WIDTH, PR_BORDER_STYLE, PR_BORDER_TOP, PR_BORDER_TOP_COLOR, PR_BORDER_TOP_STYLE, PR_BORDER_TOP_WIDTH, PR_BORDER_WIDTH, PR_BOTTOM, PR_BREAK_AFTER, PR_BREAK_BEFORE, PR_CAPTION_SIDE, PR_CASE_NAME, PR_CASE_TITLE, PR_CHANGE_BAR_CLASS, PR_CHANGE_BAR_COLOR, PR_CHANGE_BAR_OFFSET, PR_CHANGE_BAR_PLACEMENT, PR_CHANGE_BAR_STYLE, PR_CHANGE_BAR_WIDTH, PR_CHARACTER, PR_CLEAR, PR_CLIP, PR_COLOR, PR_COLOR_PROFILE_NAME, PR_COLUMN_COUNT, PR_COLUMN_GAP, PR_COLUMN_NUMBER, PR_COLUMN_WIDTH, PR_CONTENT_HEIGHT, PR_CONTENT_TYPE, PR_CONTENT_WIDTH, PR_COUNTRY, PR_CUE, PR_CUE_AFTER, PR_CUE_BEFORE, PR_DESTINATION_PLACEMENT_OFFSET, PR_DIRECTION, PR_DISPLAY_ALIGN, PR_DOMINANT_BASELINE, PR_ELEVATION, PR_EMPTY_CELLS, PR_END_INDENT, PR_ENDS_ROW, PR_EXTENT, PR_EXTERNAL_DESTINATION, PR_FLOAT, PR_FLOW_MAP_NAME, PR_FLOW_MAP_REFERENCE, PR_FLOW_NAME, PR_FLOW_NAME_REFERENCE, PR_FONT, PR_FONT_FAMILY, PR_FONT_SELECTION_STRATEGY, PR_FONT_SIZE, PR_FONT_SIZE_ADJUST, PR_FONT_STRETCH, PR_FONT_STYLE, PR_FONT_VARIANT, PR_FONT_WEIGHT, PR_FORCE_PAGE_COUNT, PR_FORMAT, PR_GLYPH_ORIENTATION_HORIZONTAL, PR_GLYPH_ORIENTATION_VERTICAL, PR_GROUPING_SEPARATOR, PR_GROUPING_SIZE, PR_HEIGHT, PR_HYPHENATE, PR_HYPHENATION_CHARACTER, PR_HYPHENATION_KEEP, PR_HYPHENATION_LADDER_COUNT, PR_HYPHENATION_PUSH_CHARACTER_COUNT, PR_HYPHENATION_REMAIN_CHARACTER_COUNT, PR_ID, PR_INDEX_CLASS, PR_INDEX_KEY, PR_INDICATE_DESTINATION, PR_INITIAL_PAGE_NUMBER, PR_INLINE_PROGRESSION_DIMENSION, PR_INTERNAL_DESTINATION, PR_INTRINSIC_SCALE_VALUE, PR_INTRUSION_DISPLACE, PR_KEEP_TOGETHER, PR_KEEP_WITH_NEXT, PR_KEEP_WITH_PREVIOUS, PR_LANGUAGE, PR_LAST_LINE_END_INDENT, PR_LEADER_ALIGNMENT, PR_LEADER_LENGTH, PR_LEADER_PATTERN, PR_LEADER_PATTERN_WIDTH, PR_LEFT, PR_LETTER_SPACING, PR_LETTER_VALUE, PR_LINE_HEIGHT, PR_LINE_HEIGHT_SHIFT_ADJUSTMENT, PR_LINE_STACKING_STRATEGY, PR_LINEFEED_TREATMENT, PR_MARGIN, PR_MARGIN_BOTTOM, PR_MARGIN_LEFT, PR_MARGIN_RIGHT, PR_MARGIN_TOP, PR_MARKER_CLASS_NAME, PR_MASTER_NAME, PR_MASTER_REFERENCE, PR_MAX_HEIGHT, PR_MAX_WIDTH, PR_MAXIMUM_REPEATS, PR_MEDIA_USAGE, PR_MERGE_PAGES_ACROSS_INDEX_KEY_REFERENCES, PR_MERGE_RANGES_ACROSS_INDEX_KEY_REFERENCES, PR_MERGE_SEQUENTIAL_PAGE_NUMBERS, PR_MIN_HEIGHT, PR_MIN_WIDTH, PR_NUMBER_COLUMNS_REPEATED, PR_NUMBER_COLUMNS_SPANNED, PR_NUMBER_ROWS_SPANNED, PR_ODD_OR_EVEN, PR_ORPHANS, PR_OVERFLOW, PR_PADDING, PR_PADDING_AFTER, PR_PADDING_BEFORE, PR_PADDING_BOTTOM, PR_PADDING_END, PR_PADDING_LEFT, PR_PADDING_RIGHT, PR_PADDING_START, PR_PADDING_TOP, PR_PAGE_BREAK_AFTER, PR_PAGE_BREAK_BEFORE, PR_PAGE_BREAK_INSIDE, PR_PAGE_CITATION_STRATEGY, PR_PAGE_HEIGHT, PR_PAGE_NUMBER_TREATMENT, PR_PAGE_POSITION, PR_PAGE_WIDTH, PR_PAUSE, PR_PAUSE_AFTER, PR_PAUSE_BEFORE, PR_PITCH, PR_PITCH_RANGE, PR_PLAY_DURING, PR_POSITION, PR_PRECEDENCE, PR_PROVISIONAL_DISTANCE_BETWEEN_STARTS, PR_PROVISIONAL_LABEL_SEPARATION, PR_REF_ID, PR_REF_INDEX_KEY, PR_REFERENCE_ORIENTATION, PR_REGION_NAME, PR_REGION_NAME_REFERENCE, PR_RELATIVE_ALIGN, PR_RELATIVE_POSITION, PR_RENDERING_INTENT, PR_RETRIEVE_BOUNDARY, PR_RETRIEVE_BOUNDARY_WITHIN_TABLE, PR_RETRIEVE_CLASS_NAME, PR_RETRIEVE_POSITION, PR_RETRIEVE_POSITION_WITHIN_TABLE, PR_RICHNESS, PR_RIGHT, PR_ROLE, PR_RULE_STYLE, PR_RULE_THICKNESS, PR_SCALING, PR_SCALING_METHOD, PR_SCORE_SPACES, PR_SCRIPT, PR_SHOW_DESTINATION, PR_SIZE, PR_SOURCE_DOCUMENT, PR_SPACE_AFTER, PR_SPACE_BEFORE, PR_SPACE_END, PR_SPACE_START, PR_SPAN, PR_SPEAK, PR_SPEAK_HEADER, PR_SPEAK_NUMERAL, PR_SPEAK_PUNCTUATION, PR_SPEECH_RATE, PR_SRC, PR_START_INDENT, PR_STARTING_STATE, PR_STARTS_ROW, PR_STRESS, PR_SUPPRESS_AT_LINE_BREAK, PR_SWITCH_TO, PR_TABLE_LAYOUT, PR_TABLE_OMIT_FOOTER_AT_BREAK, PR_TABLE_OMIT_HEADER_AT_BREAK, PR_TARGET_PRESENTATION_CONTEXT, PR_TARGET_PROCESSING_CONTEXT, PR_TARGET_STYLESHEET, PR_TEXT_ALIGN, PR_TEXT_ALIGN_LAST, PR_TEXT_ALTITUDE, PR_TEXT_DECORATION, PR_TEXT_DEPTH, PR_TEXT_INDENT, PR_TEXT_SHADOW, PR_TEXT_TRANSFORM, PR_TOP, PR_TREAT_AS_WORD_SPACE, PR_UNICODE_BIDI, PR_VERTICAL_ALIGN, PR_VISIBILITY, PR_VOICE_FAMILY, PR_VOLUME, PR_WHITE_SPACE, PR_WHITE_SPACE_COLLAPSE, PR_WHITE_SPACE_TREATMENT, PR_WIDOWS, PR_WIDTH, PR_WORD_SPACING, PR_WRAP_OPTION, PR_WRITING_MODE, PR_X_ALT_TEXT, PR_X_BLOCK_PROGRESSION_UNIT, PR_X_DISABLE_COLUMN_BALANCING, PR_X_ORPHAN_CONTENT_LIMIT, PR_X_PTR, PR_X_WIDOW_CONTENT_LIMIT, PR_XML_LANG, PR_Z_INDEX, PROPERTY_COUNT, PROPERTY_MASK`

Constructor Summary
`AbstractLayoutManager()` Abstract layout manager.
`AbstractLayoutManager(FObj fo)` Abstract layout manager.

Method Summary
`void` | `addAreas(PositionIterator posIter, LayoutContext context)` Tell the layout manager to add all the child areas implied by Position objects which will be returned by the Iterator.
`void` | `addChildArea(Area childArea)` Add a child area to the current area.
`void` | `addChildLM(LayoutManager lm)` Add the LM in the argument to the list of child LMs; set this LM as the parent; initialize the LM.
`void` | `addChildLMs(java.util.List newLMs)` Add the LMs in the argument to the list of child LMs;
`protected void` | `addId()` Registers the FO's id on the current PageViewport
`protected void` | `addMarkersToPage(boolean isStarting, boolean isFirst, boolean isLast)` Registers the FO's markers on the current PageViewport
`protected void` | `checkEndOfLayout(Position pos)` Checks to see if the incoming `Position` is the last one for this LM, and if so, calls `notifyEndOfLayout()` and cleans up.
`protected java.util.List` | `createChildLMs(int size)` Create the LM instances for the children of the formatting object being handled by this LM.
`boolean` | `createNextChildLMs(int pos)` Create more child LMs of the parent, up to child LM index pos
`java.util.List` | `getChangedKnuthElements(java.util.List oldList, int alignment)` Get a sequence of KnuthElements representing the content of the node assigned to the LM, after changes have been applied In the context of line breaking, this method is called after hyphenation has been performed, in order to receive the sequence of elements representing the text together with all possible hyphenation points. For example, if the text "representation" originates a single box element when getNextKnuthElements() is called, it will be now split in syllables (rep-re-sen-ta-tion) each one originating a box and divided by additional elements allowing a line break. In the context of page breaking, this method is called only if the pages need to be "vertically justified" modifying (also) the quantity of lines created by the paragraphs, and after a first page breaking has been performed. According to the result of the first page breaking, each paragraph now knows how many lines it must create (among the existing layout possibilities) and has to create a sequence of elements representing this layout; in particular, each box, representing a line, will contain a LineBreakPositions that will be used in the addAreas() phase. LMs having children look at the old list of elements in order to know which ones they must get the new elements from, as break conditions of preserved linefeeds can divide children into smaller groups (page sequences or paragraphs). LMs having no children can simply return the old elements if they have nothing to change. Inline LMs need to know the text alignment because it affects the elements representing feasible breaks between syllables.
`protected LayoutManager` | `getChildLM()` Return currently active child LayoutManager or null if all children have finished layout.
`java.util.List` | `getChildLMs()`
`Page` | `getCurrentPage()`
`PageViewport` | `getCurrentPV()`
`java.util.List` | `getNextKnuthElements(LayoutContext context, int alignment)` Get a sequence of KnuthElements representing the content of the node assigned to the LM
`LayoutManager` | `getParent()` Get the parent layout manager.
`Area` | `getParentArea(Area childArea)` Return an Area which can contain the passed childArea.
`PageSequenceLayoutManager` | `getPSLM()` Get the active PageSequenceLayoutManager instance for this layout process.
`protected boolean` | `hasNextChildLM()` Return indication if getChildLM will return another LM.
`void` | `initialize()` initialize the layout manager. Allows each layout manager to calculate often used values.
`boolean` | `isFinished()` Tell whether this LayoutManager has handled all of its content.
`boolean` | `isFirst(Position pos)` Indicates whether the given Position is the first area-generating Position of this LM.
`boolean` | `isLast(Position pos)` Indicates whether the given Position is the last area-generating Position of this LM.
`protected void` | `notifyEndOfLayout()` Notifies the `PageSequenceLayoutManager` that layout for this LM has ended.
`Position` | `notifyPos(Position pos)` Adds a Position to the Position participating in the first|last determination by assigning it a unique position index.
`void` | `reset()` Re-initializes this layout manager in order to re-generate its Knuth elements according to a new IPD value.
`protected void` | `setCurrentChildLM(LayoutManager childLM)`
`void` | `setFinished(boolean fin)` Set the flag indicating the LayoutManager has handled all of its content.
`void` | `setParent(LayoutManager lm)` Set the parent layout manager. The parent layout manager is required for adding areas.
`java.lang.String` | `toString()`
`protected void` | `transferExtensionAttachments(AreaTreeObject targetArea)` Transfers extension attachments from the formatting object to the area.
`protected void` | `transferExtensions(AreaTreeObject targetArea)` Transfers extensions (foreign attributes and extension attachments) from the formatting object to the area.
`protected void` | `transferForeignAttributes(AreaTreeObject targetArea)` Transfers foreign attributes from the formatting object to the area.

Methods inherited from class org.apache.fop.layoutmgr.AbstractBaseLayoutManager
`getAncestorBlockAreaBPD, getAncestorBlockAreaIPD, getBaseLength, getContentAreaBPD, getContentAreaIPD, getFObj, getGeneratesBlockArea, getGeneratesLineArea, getGeneratesReferenceArea, getNextKnuthElements, getParentAreaBPD, getParentAreaIPD, getReferenceAreaBPD, getReferenceAreaIPD, isRestartable, setGeneratesBlockArea, setGeneratesReferenceArea`

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

Field Detail

### parentLayoutManager

    protected LayoutManager parentLayoutManager

  Parent LayoutManager for this LayoutManager

### childLMs

    protected java.util.List childLMs

  List of child LayoutManagers

### fobjIter

    protected java.util.ListIterator fobjIter

  Iterator for child LayoutManagers

### curChildLM

    protected LayoutManager curChildLM

  child LM during getNextKnuthElement phase

### childLMiter

    protected java.util.ListIterator childLMiter

  child LM iterator during getNextKnuthElement phase

Constructor Detail

### AbstractLayoutManager

    public AbstractLayoutManager()

  Abstract layout manager.

### AbstractLayoutManager

    public AbstractLayoutManager(FObj fo)

  Abstract layout manager.

Parameters:
  `fo` - the formatting object for this layout manager

Method Detail

### setParent

    public void setParent(LayoutManager lm)

  Set the parent layout manager. The parent layout manager is required for adding areas.

  Specified by:
    `setParent` in interface `LayoutManager`
  Parameters:
    `lm` - the parent layout manager

### getParent

    public LayoutManager getParent()

  Get the parent layout manager.

  Specified by:
    `getParent` in interface `LayoutManager`
  Returns:
    the parent layout manager.

### initialize

    public void initialize()

  initialize the layout manager. Allows each layout manager to calculate often used values.

  Specified by:
    `initialize` in interface `LayoutManager`

### getChildLM

    protected LayoutManager getChildLM()

  Return currently active child LayoutManager or null if all children have finished layout. Note: child must implement LayoutManager! If it doesn't, skip it and print a warning.

  Returns:
    the current child LayoutManager

### setCurrentChildLM

    protected void setCurrentChildLM(LayoutManager childLM)

### hasNextChildLM

    protected boolean hasNextChildLM()

  Return indication if getChildLM will return another LM.

  Returns:
    true if another child LM is still available

### isFinished

    public boolean isFinished()

  Tell whether this LayoutManager has handled all of its content.

  Specified by:
    `isFinished` in interface `LayoutManager`
  Returns:
    True if there are no more break possibilities, ie. the last one returned represents the end of the content.

### setFinished

    public void setFinished(boolean fin)

  Set the flag indicating the LayoutManager has handled all of its content.

  Specified by:
    `setFinished` in interface `LayoutManager`
  Parameters:
    `fin` - the flag value to be set

### addAreas

    public void addAreas(PositionIterator posIter,
                         LayoutContext context)

  Tell the layout manager to add all the child areas implied by Position objects which will be returned by the Iterator.

  Specified by:
    `addAreas` in interface `LayoutManager`
  Parameters:
    `posIter` - the position iterator
    `context` - the context

### getNextKnuthElements

    public java.util.List getNextKnuthElements(LayoutContext context,
                                               int alignment)

  Get a sequence of KnuthElements representing the content of the node assigned to the LM

  Specified by:
    `getNextKnuthElements` in interface `LayoutManager`
  Parameters:
    `context` - the LayoutContext used to store layout information
    `alignment` - the desired text alignment
  Returns:
    the list of KnuthElements

### getChangedKnuthElements

    public java.util.List getChangedKnuthElements(java.util.List oldList,
                                                  int alignment)

  Get a sequence of KnuthElements representing the content of the node assigned to the LM, after changes have been applied In the context of line breaking, this method is called after hyphenation has been performed, in order to receive the sequence of elements representing the text together with all possible hyphenation points. For example, if the text "representation" originates a single box element when getNextKnuthElements() is called, it will be now split in syllables (rep-re-sen-ta-tion) each one originating a box and divided by additional elements allowing a line break. In the context of page breaking, this method is called only if the pages need to be "vertically justified" modifying (also) the quantity of lines created by the paragraphs, and after a first page breaking has been performed. According to the result of the first page breaking, each paragraph now knows how many lines it must create (among the existing layout possibilities) and has to create a sequence of elements representing this layout; in particular, each box, representing a line, will contain a LineBreakPositions that will be used in the addAreas() phase. LMs having children look at the old list of elements in order to know which ones they must get the new elements from, as break conditions of preserved linefeeds can divide children into smaller groups (page sequences or paragraphs). LMs having no children can simply return the old elements if they have nothing to change. Inline LMs need to know the text alignment because it affects the elements representing feasible breaks between syllables.

  Specified by:
    `getChangedKnuthElements` in interface `LayoutManager`
  Parameters:
    `oldList` - the elements to replace
    `alignment` - the desired text alignment
  Returns:
    the updated list of KnuthElements

### getParentArea

    public Area getParentArea(Area childArea)

  Return an Area which can contain the passed childArea. The childArea may not yet have any content, but it has essential traits set. In general, if the LayoutManager already has an Area it simply returns it. Otherwise, it makes a new Area of the appropriate class. It gets a parent area for its area by calling its parent LM. Finally, based on the dimensions of the parent area, it initializes its own area. This includes setting the content IPD and the maximum BPD.

  Specified by:
    `getParentArea` in interface `LayoutManager`
  Parameters:
    `childArea` - the child area for which the parent area is wanted
  Returns:
    the parent area for the given child

### addChildArea

    public void addChildArea(Area childArea)

  Add a child area to the current area. If this causes the maximum dimension of the current area to be exceeded, the parent LM is called to add it.

  Specified by:
    `addChildArea` in interface `LayoutManager`
  Parameters:
    `childArea` - the child area to be added

### createChildLMs

    protected java.util.List createChildLMs(int size)

  Create the LM instances for the children of the formatting object being handled by this LM.

  Parameters:
    `size` - the requested number of child LMs
  Returns:
    the list with the preloaded child LMs

### getPSLM

    public PageSequenceLayoutManager getPSLM()

  Get the active PageSequenceLayoutManager instance for this layout process.

  Specified by:
    `getPSLM` in interface `LayoutManager`
  Returns:
    the PageSequenceLayoutManager

### getCurrentPage

    public Page getCurrentPage()

  Returns:
    the `Page` instance corresponding to the current page
  See Also:
    `AbstractPageSequenceLayoutManager.getCurrentPage()`

### getCurrentPV

    public PageViewport getCurrentPV()

  Returns:
    the current page viewport

### createNextChildLMs

    public boolean createNextChildLMs(int pos)

  Create more child LMs of the parent, up to child LM index pos

  Specified by:
    `createNextChildLMs` in interface `LayoutManager`
  Parameters:
    `pos` - index up to which child LMs are requested
  Returns:
    true if requested index does exist

### getChildLMs

    public java.util.List getChildLMs()

  Specified by:
    `getChildLMs` in interface `LayoutManager`
  Returns:
    the list of child LMs

### addChildLM

    public void addChildLM(LayoutManager lm)

  Add the LM in the argument to the list of child LMs; set this LM as the parent; initialize the LM.

  Specified by:
    `addChildLM` in interface `LayoutManager`
  Parameters:
    `lm` - the LM to be added

### addChildLMs

    public void addChildLMs(java.util.List newLMs)

  Add the LMs in the argument to the list of child LMs;

  Specified by:
    `addChildLMs` in interface `LayoutManager`
  Parameters:
    `newLMs` - the list of LMs to be added

### notifyPos

    public Position notifyPos(Position pos)

  Adds a Position to the Position participating in the first|last determination by assigning it a unique position index.

  Specified by:
    `notifyPos` in interface `LayoutManager`
  Parameters:
    `pos` - the Position
  Returns:
    the same Position but with a position index

### isFirst

    public boolean isFirst(Position pos)

  Indicates whether the given Position is the first area-generating Position of this LM.

  Parameters:
    `pos` - the Position (must be one with a position index)
  Returns:
    True if it is the first Position

### isLast

    public boolean isLast(Position pos)

  Indicates whether the given Position is the last area-generating Position of this LM.

  Parameters:
    `pos` - the Position (must be one with a position index)
  Returns:
    True if it is the last Position

### transferForeignAttributes

    protected void transferForeignAttributes(AreaTreeObject targetArea)

  Transfers foreign attributes from the formatting object to the area.

  Parameters:
    `targetArea` - the area to set the attributes on

### transferExtensionAttachments

    protected void transferExtensionAttachments(AreaTreeObject targetArea)

  Transfers extension attachments from the formatting object to the area.

  Parameters:
    `targetArea` - the area to set the extensions on

### transferExtensions

    protected void transferExtensions(AreaTreeObject targetArea)

  Transfers extensions (foreign attributes and extension attachments) from the formatting object to the area.

  Parameters:
    `targetArea` - the area to set the extensions on

### addMarkersToPage

    protected void addMarkersToPage(boolean isStarting,
                                    boolean isFirst,
                                    boolean isLast)

  Registers the FO's markers on the current PageViewport

  Parameters:
    `isStarting` - boolean indicating whether the markers qualify as 'starting'
    `isFirst` - boolean indicating whether the markers qualify as 'first'
    `isLast` - boolean indicating whether the markers qualify as 'last'

### addId

    protected void addId()

  Registers the FO's id on the current PageViewport

### notifyEndOfLayout

    protected void notifyEndOfLayout()

  Notifies the `PageSequenceLayoutManager` that layout for this LM has ended.

### checkEndOfLayout

    protected void checkEndOfLayout(Position pos)

  Checks to see if the incoming `Position` is the last one for this LM, and if so, calls `notifyEndOfLayout()` and cleans up.

  Parameters:
    `pos` - the `Position` to check

### toString

    public java.lang.String toString()

### reset

    public void reset()

  Re-initializes this layout manager in order to re-generate its Knuth elements according to a new IPD value.

  Specified by:
    `reset` in interface `LayoutManager`
  Overrides:
    `reset` in class `AbstractBaseLayoutManager`

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