PreviousTableCellAction.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.action;

import net.sf.vex.layout.Box;
import net.sf.vex.layout.TableRowBox;
import net.sf.vex.widget.IBoxFilter;
import net.sf.vex.widget.IVexWidget;

/**
 * Moves the caret to the next table cell. The contents of the cell
 * are selected. If the current cell is the last cell in the table, 
 * the current row is duplicated.
 */
public class PreviousTableCellAction extends AbstractVexAction {

    public void run(final IVexWidget vexWidget) {
        
        final TableRowBox tr = (TableRowBox) vexWidget.findInnermostBox(new IBoxFilter() {
            public boolean matches(Box box) {
                return box instanceof TableRowBox;
            }
        });

        if (tr == null) {
            // not in a table row
            return;
        }
        
        int offset = vexWidget.getCaretOffset();
        
        Box[] cells = tr.getChildren();
        for (int i = cells.length - 1; i >= 0; i--) {
            if (cells[i].getEndOffset() < offset) {
                vexWidget.moveTo(cells[i].getStartOffset());
                vexWidget.moveTo(cells[i].getEndOffset(), true);
                return;
            }
        }
        
        // No next cell found in this row
        // Find the previous row
        Box[] rows = tr.getParent().getChildren(); 
        for (int i = rows.length - 1; i >= 0; i--) {
            if (rows[i].getEndOffset() < offset) {
                cells = rows[i].getChildren();
                if (cells.length > 0) {
                    Box cell = cells[cells.length - 1];
                    vexWidget.moveTo(cell.getStartOffset());
                    vexWidget.moveTo(cell.getEndOffset(), true);
                }
                return;
            }
        }
        
    }
}