/*
* Copyright (c) 2014, grossmann
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the jo-widgets.org nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL jo-widgets.org BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*/
package org.jowidgets.tools.value;
import org.jowidgets.api.controller.IDisposeListener;
import org.jowidgets.api.widgets.IInputComponent;
import org.jowidgets.common.widgets.controller.IInputListener;
import org.jowidgets.util.Assert;
import org.jowidgets.util.IObservableValue;
import org.jowidgets.util.IObservableValueListener;
import org.jowidgets.util.NullCompatibleEquivalence;
import org.jowidgets.util.ObservableValue;
public final class InputComponentBind {
private InputComponentBind() {}
/**
* Binds an input component to a newly created observable value and returns the observable value.
* If the input component will be disposed, the binding will be disposed too.
*
* @param inputComponent The input component to bind
*
* @return The created observable value
*/
public static <VALUE_TYPE> IObservableValue<VALUE_TYPE> bind(final IInputComponent<VALUE_TYPE> inputComponent) {
Assert.paramNotNull(inputComponent, "inputComponent");
final IObservableValue<VALUE_TYPE> result = new ObservableValue<VALUE_TYPE>();
bind(result, inputComponent);
return result;
}
/**
* Binds an input component to an observable value. If the input component will be disposed, the binding will be disposed too.
*
* @param source The source observable value to bind to
* @param inputComponent The input component to bind
*/
public static <VALUE_TYPE> void bind(
final IObservableValue<VALUE_TYPE> source,
final IInputComponent<VALUE_TYPE> inputComponent) {
Assert.paramNotNull(source, "source");
Assert.paramNotNull(inputComponent, "inputComponent");
final InputComponentBinding<VALUE_TYPE> binding = new InputComponentBinding<VALUE_TYPE>(source, inputComponent);
binding.bind();
inputComponent.addDisposeListener(new IDisposeListener() {
@Override
public void onDispose() {
binding.dispose();
}
});
}
private static final class InputComponentBinding<VALUE_TYPE> {
private final IObservableValue<VALUE_TYPE> source;
private final IInputComponent<VALUE_TYPE> inputComponent;
private final IInputListener inputListener;
private final IObservableValueListener<VALUE_TYPE> observableValueListener;
private boolean onSourceSet;
private boolean onDestinationSet;
private InputComponentBinding(final IObservableValue<VALUE_TYPE> source, final IInputComponent<VALUE_TYPE> inputComponent) {
super();
this.source = source;
this.inputComponent = inputComponent;
if (source.getValue() != null) {
inputComponent.setValue(source.getValue());
}
else if (inputComponent.getValue() != null) {
source.setValue(inputComponent.getValue());
}
this.inputListener = new IInputListener() {
@Override
public void inputChanged() {
if (!onSourceSet
&& !onDestinationSet
&& !NullCompatibleEquivalence.equals(inputComponent.getValue(), source.getValue())) {
onSourceSet = true;
try {
source.setValue(inputComponent.getValue());
}
finally {
onSourceSet = false;
}
}
}
};
this.observableValueListener = new IObservableValueListener<VALUE_TYPE>() {
@Override
public void changed(final IObservableValue<VALUE_TYPE> observableValue, final VALUE_TYPE value) {
if (!onSourceSet && !onDestinationSet && !NullCompatibleEquivalence.equals(inputComponent.getValue(), value)) {
onDestinationSet = true;
try {
inputComponent.setValue(value);
}
finally {
onDestinationSet = false;
}
}
}
};
}
private void bind() {
inputComponent.addInputListener(inputListener);
source.addValueListener(observableValueListener);
}
private void dispose() {
inputComponent.removeInputListener(inputListener);
source.removeValueListener(observableValueListener);
}
}
}