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/*
* Copyright 2000-2014 Vaadin Ltd.
*
* 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.vaadin.ui.proto;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;
import com.vaadin.server.communication.data.typed.CollectionDataSource;
import com.vaadin.server.communication.data.typed.DataProvider;
import com.vaadin.server.communication.data.typed.DataSource;
import com.vaadin.server.communication.data.typed.TypedDataGenerator;
import com.vaadin.shared.ui.proto.listbox.ListBoxConstants;
import com.vaadin.shared.ui.proto.listbox.ListBoxSelectRpc;
import com.vaadin.ui.AbstractComponent;
import elemental.json.JsonObject;
/**
* ListBox is a simple select component typed to a data type.
*
* @since
*/
public class ListBox<T> extends AbstractComponent {
private static class DefaultNameProvider<T> implements NameProvider<T> {
@Override
public String getName(T value) {
return value.toString();
}
}
public interface NameProvider<T> extends Serializable {
String getName(T value);
}
public interface ValueChange<T> extends Serializable {
void valueChange(T value);
}
private T selected;
private DataProvider<T> dataProvider;
private Set<ValueChange<T>> listeners = new LinkedHashSet<ValueChange<T>>();
public ListBox(Collection<T> data) {
this(new CollectionDataSource<T>(data), new DefaultNameProvider<T>());
}
public ListBox(DataSource<T> data) {
this(data, new DefaultNameProvider<T>());
}
public ListBox(Collection<T> data, NameProvider<T> nameProvider) {
this(new CollectionDataSource<T>(data), nameProvider);
}
public ListBox(DataSource<T> data, NameProvider<T> nameProvider) {
setDataSource(data, nameProvider);
registerRpc(new ListBoxSelectRpc() {
@Override
public void select(String key) {
if (key != null && !key.isEmpty()) {
// Key mapper gives the object represented by the given
// key communicated to the client-side
selected = dataProvider.getKeyMapper().get(key);
fireSelectionChange(selected);
} else {
selected = null;
}
}
});
}
public ListBox() {
this(new CollectionDataSource<T>(new ArrayList<T>()),
new DefaultNameProvider<T>());
}
public void setDataSource(Collection<T> data) {
setDataSource(data, new DefaultNameProvider<T>());
}
public void setDataSource(DataSource<T> data) {
setDataSource(data, new DefaultNameProvider<T>());
}
public void setDataSource(Collection<T> data, NameProvider<T> nameProvider) {
setDataSource(new CollectionDataSource<T>(data), nameProvider);
}
public void setDataSource(DataSource<T> data,
final NameProvider<T> nameProvider) {
dataProvider = DataProvider.create(data, this);
dataProvider.addDataGenerator(new TypedDataGenerator<T>() {
@Override
public void generateData(T bean, JsonObject rowData) {
rowData.put(ListBoxConstants.NAME_KEY,
nameProvider.getName(bean));
}
@Override
public void destroyData(T bean) {
// No data needs to be destroyed.
}
});
}
public void addValueChangeListener(ValueChange<T> listener) {
listeners.add(listener);
}
public void removeValueChangeListener(ValueChange<T> listener) {
listeners.remove(listener);
}
public T getSelected() {
return selected;
}
protected void fireSelectionChange(T selected) {
List<ValueChange<T>> set = new ArrayList<ValueChange<T>>(listeners);
for (ValueChange<T> listener : set) {
listener.valueChange(selected);
}
}
}
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