/**
* Copyright 2014 55 Minutes (http://www.55minutes.com)
*
* 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 fiftyfive.wicket.feedback;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import org.apache.wicket.Component;
import org.apache.wicket.MarkupContainer;
import org.apache.wicket.behavior.Behavior;
import org.apache.wicket.feedback.ComponentFeedbackMessageFilter;
import org.apache.wicket.feedback.ContainerFeedbackMessageFilter;
import org.apache.wicket.feedback.FeedbackMessage;
import org.apache.wicket.feedback.FeedbackMessagesModel;
import org.apache.wicket.markup.ComponentTag;
/**
* Automatically adds an appropriate CSS feedback class to a component if
* that component or any of its descendants have feedback messages.
* <p>
* For example, let's say our Java looks like this:
* <pre class="example">
* add(new RequiredTextField("username").add(FeedbackStyle.INSTANCE));</pre>
* <p>
* Our HTML is:
* <pre class="example">
* <input type="text" wicket:id="username" /></pre>
* <p>
* Now, when our text field has a validation message to report, for example
* when the user submits the form without filling in the required value, our
* component will render like this:
* <pre class="example">
* <input type="text" class="feedbackPanelERROR" /></pre>
* <p>
* Notice how the {@code <input>} gains the appropriate CSS class.
*
* @since 2.0
*/
public class FeedbackStyle extends Behavior
{
public static final FeedbackStyle INSTANCE = new FeedbackStyle();
public void onComponentTag(Component c, ComponentTag tag)
{
List<FeedbackMessage> msgs = newFeedbackMessagesModel(c).getObject();
if(msgs.size() > 0)
{
StringBuffer newClassValue = new StringBuffer(
tag.getAttributes().getString("class", "")
);
Set<String> classes = new HashSet<String>();
for(FeedbackMessage m : msgs)
{
String cssClass = getCssClass(m);
if(classes.add(cssClass))
{
if(newClassValue.length() > 0)
{
newClassValue.append(" ");
}
newClassValue.append(cssClass);
}
}
tag.put("class", newClassValue.toString());
tag.setModified(true);
}
}
protected FeedbackMessagesModel newFeedbackMessagesModel(Component c)
{
FeedbackMessagesModel model = new FeedbackMessagesModel(c);
if(c instanceof MarkupContainer)
{
model.setFilter(new ContainerFeedbackMessageFilter(
(MarkupContainer) c)
);
}
else
{
model.setFilter(new ComponentFeedbackMessageFilter(c));
}
return model;
}
protected String getCssClass(FeedbackMessage msg)
{
return "feedbackPanel" + msg.getLevelAsString();
}
}