com.google.gwt.sample.dynatablerf.client.widgets.MentorSelector.java Source code

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Here is the source code for com.google.gwt.sample.dynatablerf.client.widgets.MentorSelector.java

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/*
 * Copyright 2010 Google Inc.
 * 
 * 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.google.gwt.sample.dynatablerf.client.widgets;

import com.google.gwt.core.client.GWT;
import com.google.gwt.editor.client.IsEditor;
import com.google.gwt.editor.client.adapters.OptionalFieldEditor;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.sample.dynatablerf.shared.DynaTableRequestFactory;
import com.google.gwt.sample.dynatablerf.shared.PersonProxy;
import com.google.gwt.uibinder.client.UiBinder;
import com.google.gwt.uibinder.client.UiField;
import com.google.gwt.uibinder.client.UiHandler;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.Composite;
import com.google.gwt.user.client.ui.Widget;
import com.google.web.bindery.requestfactory.shared.Receiver;

/**
 * This demonstrates how an editor can be constructed to handle optional fields.
 * The Person domain object's mentor property is initially <code>null</code>.
 * This type delegates editing control to an instance of the
 * {@link OptionalValueEditor} adapter class.
 */
public class MentorSelector extends Composite implements IsEditor<OptionalFieldEditor<PersonProxy, NameLabel>> {

    interface Binder extends UiBinder<Widget, MentorSelector> {
    }

    @UiField
    Button choose;

    @UiField
    Button clear;

    @UiField
    NameLabel nameLabel;

    private final OptionalFieldEditor<PersonProxy, NameLabel> editor;
    private final DynaTableRequestFactory factory;

    public MentorSelector(DynaTableRequestFactory factory) {
        this.factory = factory;
        initWidget(GWT.<Binder>create(Binder.class).createAndBindUi(this));
        editor = OptionalFieldEditor.of(nameLabel);
    }

    public OptionalFieldEditor<PersonProxy, NameLabel> asEditor() {
        return editor;
    }

    public void setEnabled(boolean enabled) {
        choose.setEnabled(enabled);
        clear.setEnabled(enabled);
    }

    @Override
    protected void onUnload() {
        nameLabel.cancelSubscription();
    }

    @UiHandler("choose")
    void onChoose(ClickEvent event) {
        setEnabled(false);
        factory.schoolCalendarRequest().getRandomPerson().to(new Receiver<PersonProxy>() {
            @Override
            public void onSuccess(PersonProxy response) {
                setValue(response);
                setEnabled(true);
            }
        }).fire();
    }

    @UiHandler("clear")
    void onClear(ClickEvent event) {
        setValue(null);
    }

    /**
     * This method is not called by the Editor framework.
     */
    private void setValue(PersonProxy person) {
        editor.setValue(person);
        nameLabel.setVisible(person != null);
    }
}