| // 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.form; |
| |
| import org.apache.tapestry.AbstractComponent; |
| import org.apache.tapestry.ApplicationRuntimeException; |
| import org.apache.tapestry.IBinding; |
| import org.apache.tapestry.IMarkupWriter; |
| import org.apache.tapestry.IRequestCycle; |
| import org.apache.tapestry.Tapestry; |
| |
| /** |
| * A component that renders an HTML <option> form element. |
| * Such a component must be wrapped (possibly indirectly) |
| * inside a {@link Select} component. |
| * |
| * [<a href="../../../../../ComponentReference/Option.html">Component Reference</a>] |
| * |
| * @author Howard Lewis Ship |
| * @version $Id$ |
| * |
| **/ |
| |
| public abstract class Option extends AbstractComponent |
| { |
| /** |
| * Renders the <option> element, or responds when the form containing the element |
| * is submitted (by checking {@link Form#isRewinding()}. |
| * |
| * <p>If the <code>label</code> property is set, it is inserted inside the |
| * <option> element. |
| * |
| **/ |
| |
| protected void renderComponent(IMarkupWriter writer, IRequestCycle cycle) |
| { |
| Select select = Select.get(cycle); |
| if (select == null) |
| throw new ApplicationRuntimeException( |
| Tapestry.getMessage("Option.must-be-contained-by-select"), |
| this, |
| null, |
| null); |
| |
| // It isn't enough to know whether the cycle in general is rewinding, need to know |
| // specifically if the form which contains this component is rewinding. |
| |
| boolean rewinding = select.isRewinding(); |
| |
| String value = select.getNextOptionId(); |
| |
| if (rewinding) |
| { |
| if (!select.isDisabled()) |
| getSelectedBinding().setBoolean(select.isSelected(value)); |
| |
| renderBody(writer, cycle); |
| } |
| else |
| { |
| writer.begin("option"); |
| |
| writer.attribute("value", value); |
| |
| if (getSelectedBinding().getBoolean()) |
| writer.attribute("selected", "selected"); |
| |
| renderInformalParameters(writer, cycle); |
| |
| String label = getLabel(); |
| |
| if (label != null) |
| writer.print(label); |
| |
| renderBody(writer, cycle); |
| |
| writer.end(); |
| } |
| |
| } |
| |
| public abstract IBinding getSelectedBinding(); |
| |
| public abstract String getLabel(); |
| } |