TableRowGroupBox.java

/*******************************************************************************
 * Copyright (c) 2004, 2008 John Krasnay and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     John Krasnay - initial API and implementation
 *******************************************************************************/
package net.sf.vex.layout;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

import net.sf.vex.core.Insets;
import net.sf.vex.css.CSS;
import net.sf.vex.css.Styles;
import net.sf.vex.dom.Element;

/**
 * Container for TableRowBox objects. May correspond to an element with
 * display:table-row-group, display:table-head-group, display:table-foot-group,
 * or may be anonymous.
 */
public class TableRowGroupBox extends AbstractBlockBox {

    /**
     * Class constructor for non-anonymous table row groups.
     * 
     * @param context LayoutContext to use.
     * @param parent Parent of this box.
     * @param element Element that generated this box.
     */
    public TableRowGroupBox(LayoutContext context, BlockBox parent, Element element) {
        super(context, parent, element);
    }

    
    /**
     * Class constructor for anonymous table row groups.
     *
     * @param context LayoutContext to use.
     * @param parent Parent of this box.
     * @param startOffset Start of the range encompassing the table.
     * @param endOffset End of the range encompassing the table.
     */
    public TableRowGroupBox(LayoutContext context, BlockBox parent, int startOffset, int endOffset) {
        super(context, parent, startOffset, endOffset);
        
    }


    protected List createChildren(final LayoutContext context) {
        // TODO Auto-generated method stub
        
        // Walk children in range
        //     - table-row children get non-anonymous TableRowBox
        //     - runs of others get anonymous TableRowBox
        
        final List children = new ArrayList();
        
        this.iterateChildrenByDisplayStyle(context.getStyleSheet(), childDisplayStyles, new ElementOrRangeCallback() {
            public void onElement(Element child, String displayStyle) {
                children.add(new TableRowBox(context, TableRowGroupBox.this, child));
            }
            public void onRange(Element parent, int startOffset, int endOffset) {
                children.add(new TableRowBox(context, TableRowGroupBox.this, startOffset, endOffset));
            }
        });

        return children;
    }

    public Insets getInsets(LayoutContext context, int containerWidth) {
        return Insets.ZERO_INSETS;
    }

    public int getMarginBottom() {
        return 0;
    }

    public int getMarginTop() {
        return 0;
    }
    
    public void paint(LayoutContext context, int x, int y) {

        if (this.skipPaint(context, x, y)) {
            return;
        }
        
        this.paintChildren(context, x, y);
        
        this.paintSelectionFrame(context, x, y, true);
    }


    protected int positionChildren(LayoutContext context) {
        
        Styles styles = context.getStyleSheet().getStyles(this.findContainingElement());
        int spacing = styles.getBorderSpacing().getVertical();
        
        int childY = spacing;
        for (int i = 0; i < this.getChildren().length; i++) {
            
            TableRowBox child = (TableRowBox) this.getChildren()[i];
            // TODO must force table row margins to be zero
            Insets insets = child.getInsets(context, this.getWidth());
            
            childY += insets.getTop();
            
            child.setX(insets.getLeft());
            child.setY(childY);
            
            childY += child.getHeight() + insets.getBottom() + spacing;
        }
        this.setHeight(childY);
        
        return -1; // TODO revisit
    }


    //====================================================== PRIVATE

    private static Set childDisplayStyles = new HashSet();
    
    static {
        childDisplayStyles.add(CSS.TABLE_ROW);
    }

    

}