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/*
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* Angkor Web Framework
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*
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* Distributable under LGPL license.
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* See terms of license at gnu.org.
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*/
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package com.tirsen.angkor.table;
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import com.tirsen.angkor.Debug;
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import com.tirsen.angkor.RenderContext;
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import com.tirsen.angkor.event.AbstractAction;
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import com.tirsen.angkor.event.Action;
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import com.tirsen.angkor.event.ActionEvent;
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import com.tirsen.angkor.Component;
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import com.tirsen.angkor.widget.Link;
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import org.apache.log4j.Category;
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import java.io.IOException;
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/**
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* @author $Author: tirsen $
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* @version $Revision: 1.6 $
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* <BR>
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* $Id: TableScroller.java,v 1.6 2002/10/13 19:59:22 tirsen Exp $
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*/
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public class TableScroller extends Component
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{
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private static final Category logger = Category.getInstance(Debug.LOGGER_NAME);
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private Table table;
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public void setTable(Table table)
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{
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this.table = table;
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}
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private boolean isForwardEnabled()
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{
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boolean result;
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if (table == null)
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{
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result = false;
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}
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else
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{
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if (getEnd() >= getRowCount() - 1)
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result = false;
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else
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result = true;
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}
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return result;
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}
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private boolean isBackwardEnabled()
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{
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boolean result;
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if (table == null)
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{
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result = false;
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}
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else
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{
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if (getStart() == 0)
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result = false;
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else
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result = true;
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}
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return result;
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}
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private int getEnd()
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{
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return table.getTableModel().getEnd();
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}
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private int getStart()
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{
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return table.getTableModel().getStart();
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}
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private int getRowCount()
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{
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return table.getRowCount();
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}
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public void render(RenderContext context) throws IOException
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{
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getPrevious().render(context);
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context.println(" ");
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getNext().render(context);
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}
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public Action getPreviousAction()
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{
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return new BackwardAction();
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}
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public Action getNextAction()
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{
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return new ForwardAction();
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}
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private Link getPrevious()
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{
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return Link.createActionLink(getPreviousAction());
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}
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private Link getNext()
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{
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return Link.createActionLink(getNextAction());
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}
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private class ForwardAction extends AbstractAction
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{
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public ForwardAction()
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{
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super("Next");
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}
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public void actionPerformed(ActionEvent evt)
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{
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table.scrollForward();
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}
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public boolean isEnabled()
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{
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return super.isEnabled() && isForwardEnabled();
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}
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}
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private class BackwardAction extends AbstractAction
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{
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public BackwardAction()
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{
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super("Previous");
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}
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public void actionPerformed(ActionEvent evt)
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{
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table.scrollBackward();
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}
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6
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public boolean isEnabled()
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{
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6
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return super.isEnabled() && isBackwardEnabled();
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}
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}
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}
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