| // Copyright 2004 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry.vlib.components; |
| |
| import org.apache.tapestry.BaseComponent; |
| import org.apache.tapestry.IActionListener; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.Tapestry; |
| import org.apache.tapestry.vlib.ejb.SortColumn; |
| |
| /** |
| * Comopnent for allowing a column to be sorted. |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * @since 3.0 |
| * |
| **/ |
| |
| public abstract class ColumnSorter extends BaseComponent |
| { |
| public abstract SortColumn getSortColumn(); |
| |
| public abstract SortColumn getSelected(); |
| public abstract void setSelected(SortColumn selected); |
| |
| public abstract boolean isDescending(); |
| public abstract void setDescending(boolean descending); |
| |
| public abstract IActionListener getListener(); |
| |
| public void handleClick(IRequestCycle cycle) |
| { |
| SortColumn selected = getSelected(); |
| SortColumn sortColumn = getSortColumn(); |
| |
| if (selected != sortColumn) |
| { |
| setSelected(sortColumn); |
| setDescending(false); |
| } |
| else |
| { |
| boolean current = isDescending(); |
| setDescending(!current); |
| } |
| |
| IActionListener listener = getListener(); |
| if (listener == null) |
| throw Tapestry.createRequiredParameterException(this, "listener"); |
| |
| listener.actionTriggered(this, cycle); |
| } |
| } |