cvs commit: xml-fop/src/org/apache/fop/fo/flow RowSpanMgr.java

[kl...@apache.org]

klease      01/07/05 13:05:50

  Added:       src/org/apache/fop/fo/flow RowSpanMgr.java
  Log:
  Helper class for spanning rows
  
  Revision  Changes    Path
  1.1                  xml-fop/src/org/apache/fop/fo/flow/RowSpanMgr.java
  
  Index: RowSpanMgr.java
  ===================================================================
  /*-- $Id: RowSpanMgr.java,v 1.1 2001/07/05 20:05:49 klease Exp $ --
   * Copyright (C) 2001 The Apache Software Foundation. All rights reserved.
   * For details on use and redistribution please refer to the
   * LICENSE file included with these sources.
   */
  
  package org.apache.fop.fo.flow;
  
  import org.apache.fop.layout.Area;
  import java.util.Enumeration;
  
  public class RowSpanMgr {
      class SpanInfo {
  	int cellHeight;
  	int totalRowHeight;
  	int rowsRemaining;
  	//int numCols; // both V and H span
  	TableCell cell;
          
  	SpanInfo(TableCell cell, int cellHeight, int rowsSpanned) {
  	    this.cell = cell;
  	    this.cellHeight = cellHeight;
  	    this.totalRowHeight = 0;
  	    this.rowsRemaining = rowsSpanned;
  	}
  
  	/**
  	 * Return the height remaining in the span.
  	 */
  	int heightRemaining() {
  	    int hl = cellHeight - totalRowHeight;
  	    return (hl>0)? hl : 0;
  	}
  
  	boolean isInLastRow() {
  	    return (rowsRemaining == 1);
  	}
  
  	boolean finishRow(int rowHeight) {
  	    totalRowHeight += rowHeight;
  	    if (--rowsRemaining == 0) {
  		if (cell != null) {
  		    cell.setRowHeight(totalRowHeight);
  		}
  		return true;
  	    }
  	    else return false;
  	}
      }
  
      private SpanInfo spanInfo[];
  
      public RowSpanMgr(int numCols) {
  	this.spanInfo = new SpanInfo[numCols];
      }
  
      public void addRowSpan(TableCell cell, int firstCol, int numCols,
  			 int cellHeight, int rowsSpanned) {
  	spanInfo[firstCol-1] = new SpanInfo(cell, cellHeight, rowsSpanned);
  	for (int i=0; i <numCols-1; i++) {
  	    spanInfo[firstCol+i] =
  		new SpanInfo(null, cellHeight, rowsSpanned); // copy!
  	}
      }
  
      public boolean isSpanned(int colNum) {
  	return (spanInfo[colNum-1] != null);
      }
  
  
      public TableCell getSpanningCell(int colNum) {
  	if (spanInfo[colNum-1] != null) {
  	    return spanInfo[colNum-1].cell;
  	}
  	else return null;
      }
  
  
      /** Return true if any column has an unfinished vertical span.
       */
      public boolean hasUnfinishedSpans() {
  	for (int i=0; i < spanInfo.length; i++) {
  	    if (spanInfo[i] != null)
  		return true;
  	}
  	return false;
      }
  
  	/** Done with a row.
  	 * Any spans with only one row left are done
  	 * This means that we can now set the total height for this cell box
  	 * Loop over all cells with spans and find number of rows remaining
  	 * if rows remaining  = 1, set the height on the cell area and
  	 * then remove the cell from the list of spanned cells. For other
  	 * spans, add the rowHeight to the spanHeight.
  	 */
      public void finishRow(int rowHeight) {
  	for (int i=0; i < spanInfo.length; i++) {
  	    if (spanInfo[i] != null &&
  		spanInfo[i].finishRow(rowHeight))
  		spanInfo[i] = null;
  	    }
  	}
  
      /**
       * If the cell in this column is in the last row of its vertical
       * span, return the height left. If it's not in the last row, or if
       * the content height <= the content height of the previous rows
       * of the span, return 0.
       */
      public int getRemainingHeight(int colNum) {
          if (spanInfo[colNum-1] != null) {
  	    return spanInfo[colNum-1].heightRemaining();
  	}
  	else return 0;
      }
  
      public boolean isInLastRow(int colNum) {
          if (spanInfo[colNum-1] != null) {
  	    return spanInfo[colNum-1].isInLastRow();
  	}
  	else return false;
      }
  
  }
  
  
  

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