com.pietschy.gwt.pectin.client.binding.ValueModelWithValueBinding.java Source code

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Here is the source code for com.pietschy.gwt.pectin.client.binding.ValueModelWithValueBinding.java

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/*
 * Copyright 2009 Andrew Pietsch 
 *
 * 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.pietschy.gwt.pectin.client.binding;

import com.google.gwt.event.logical.shared.ValueChangeEvent;
import com.google.gwt.event.logical.shared.ValueChangeHandler;
import com.google.gwt.user.client.ui.HasValue;
import com.pietschy.gwt.pectin.client.value.MutableValueModel;

/**
 * Created by IntelliJ IDEA.
 * User: andrew
 * Date: Jul 1, 2009
 * Time: 4:35:13 PM
 * To change this template use File | Settings | File Templates.
 */
public class ValueModelWithValueBinding<T> extends AbstractMutableValueBinding<T> {
    private HasValue<Boolean> widget;

    private T value;
    private ValueChangeHandler<Boolean> widgetChangeMonitor = new ValueChangeHandler<Boolean>() {
        public void onValueChange(ValueChangeEvent<Boolean> event) {
            onWidgetValueChange(event);
        }
    };

    public ValueModelWithValueBinding(MutableValueModel<T> field, HasValue<Boolean> widget, T value) {
        super(field);
        this.widget = widget;
        this.value = value;
        registerDisposable(widget.addValueChangeHandler(widgetChangeMonitor));
    }

    private void onWidgetValueChange(ValueChangeEvent<Boolean> event) {
        // we only write back to the model if we've been selected.
        if (event.getValue()) {
            updateModel(this.value);
        }
    }

    protected void updateTarget(T value) {
        widget.setValue(areEqual(this.value, value), false);
    }

    public HasValue<Boolean> getTarget() {
        return widget;
    }
}