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MultipleSelect.java
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MultipleSelect.java
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// Copyright 2011 Howard M. Lewis Ship
//
// 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 com.howardlewisship.tapx.core.components;
import java.util.Set;
import org.apache.tapestry5.BindingConstants;
import org.apache.tapestry5.ComponentAction;
import org.apache.tapestry5.ComponentResources;
import org.apache.tapestry5.annotations.Environmental;
import org.apache.tapestry5.annotations.Import;
import org.apache.tapestry5.annotations.Parameter;
import org.apache.tapestry5.annotations.Property;
import org.apache.tapestry5.corelib.components.Palette;
import org.apache.tapestry5.ioc.annotations.Inject;
import org.apache.tapestry5.json.JSONArray;
import org.apache.tapestry5.json.JSONObject;
import org.apache.tapestry5.services.FormSupport;
import org.apache.tapestry5.services.javascript.JavaScriptSupport;
import com.howardlewisship.tapx.core.multiselect.MultipleSelectModel;
/**
* Both a simplification of the Tapestry {@link Palette} component, and an extension in that it supports
* adding new values on the fly on the client side.
*/
@Import(stack = "tapx-core")
public class MultipleSelect
{
/**
* The set of values edited by the component; this is used when rendering. When the form is submitted,
* the values are first cleared, then repopulated with the selected values (some of which may be created
* for the first time as part of this process).
*/
@Parameter(required = true, allowNull = false, autoconnect = true)
private Set<?> values;
@SuppressWarnings("rawtypes")
@Parameter(required = true, allowNull = false)
private MultipleSelectModel model;
/**
* Additional CSS class(es), beyond the mandatory default of "tx-multiselect".
*/
@Parameter(name = "class", defaultPrefix = BindingConstants.LITERAL)
private String className;
@Environmental
private FormSupport formSupport;
@Environmental
private JavaScriptSupport jss;
@Inject
private ComponentResources resources;
@Property(write = false)
private String clientId, name;
public static class ProcessSubmission implements ComponentAction<MultipleSelect>
{
private static final long serialVersionUID = -5387860921749570953L;
private final String name;
public ProcessSubmission(String name)
{
this.name = name;
}
@Override
public void execute(MultipleSelect component)
{
component.processSubmission(name);
}
}
void setupRender()
{
clientId = jss.allocateClientId(resources);
name = formSupport.allocateControlName(resources.getId());
writeJavaScript(clientId, name);
}
public String getComputedClassName()
{
return className == null ? "tx-multiselect" : "tx-multiselect " + className;
}
@SuppressWarnings("unchecked")
private void writeJavaScript(String clientId, String name)
{
JSONObject spec = new JSONObject("clientId", clientId);
for (Object value : values)
{
String clientValue = model.toClient(value);
spec.append("values", clientValue);
}
for (Object value : model.getAvailableValues())
{
String clientValue = model.toClient(value);
String label = model.toLabel(value);
JSONArray row = new JSONArray(clientValue, label);
spec.append("model", row);
}
jss.addInitializerCall("tapxMultipleSelect", spec);
}
private void processSubmission(String name)
{
}
}