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/*******************************************************************************
* Copyright (c) 2008 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.ui.internal.swt;
import org.eclipse.jpt.common.ui.internal.listeners.SWTPropertyChangeListenerWrapper;
import org.eclipse.jpt.common.utility.internal.StringTools;
import org.eclipse.jpt.common.utility.model.event.PropertyChangeEvent;
import org.eclipse.jpt.common.utility.model.listener.PropertyChangeListener;
import org.eclipse.jpt.common.utility.model.value.PropertyValueModel;
import org.eclipse.jpt.common.utility.model.value.WritablePropertyValueModel;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.ModifyEvent;
import org.eclipse.swt.events.ModifyListener;
import org.eclipse.swt.widgets.Spinner;
/**
*
*/
@SuppressWarnings("nls")
public class SpinnerModelAdapter {
/**
* A value model on the underlying model list.
*/
protected final WritablePropertyValueModel<Integer> numberHolder;
/**
* A listener that allows us to synchronize the spinner's contents with
* the model list.
*/
protected final PropertyChangeListener propertyChangeListener;
/**
* The spinner we keep synchronized with the model string.
*/
protected final Spinner spinner;
/**
* A listener that allows us to synchronize our selection number holder
* with the spinner's value.
*/
protected final ModifyListener spinnerModifyListener;
/**
* A listener that allows us to stop listening to stuff when the spinner
* is disposed.
*/
protected final DisposeListener spinnerDisposeListener;
/**
* The value shown when the number holder's value is <code>null</code>.
*/
protected final int defaultValue;
/**
* This lock is used to prevent the listeners to be notified when the value
* changes from the spinner or from the holder.
*/
private boolean locked;
// ********** static methods **********
/**
* Adapt the specified model list and selections to the specified spinner.
* Use the specified string converter to convert the model items to strings
* to be displayed in the spinner.
*/
public static SpinnerModelAdapter adapt(
WritablePropertyValueModel<Integer> numberHolder,
Spinner spinner,
int defaultValue)
{
return new SpinnerModelAdapter(numberHolder, spinner, defaultValue);
}
// ********** constructors **********
/**
* Constructor - the list holder, selections holder, list box, and
* string converter are required.
*/
protected SpinnerModelAdapter(WritablePropertyValueModel<Integer> numberHolder,
Spinner spinner,
int defaultValue) {
super();
if ((numberHolder == null) || (spinner == null)) {
throw new NullPointerException();
}
this.numberHolder = numberHolder;
this.spinner = spinner;
this.defaultValue = defaultValue;
this.propertyChangeListener = this.buildPropertyChangeListener();
this.numberHolder.addPropertyChangeListener(PropertyValueModel.VALUE, this.propertyChangeListener);
this.spinnerModifyListener = this.buildSpinnerModifyListener();
this.spinner.addModifyListener(this.spinnerModifyListener);
this.spinnerDisposeListener = this.buildSpinnerDisposeListener();
this.spinner.addDisposeListener(this.spinnerDisposeListener);
this.updateSpinner(numberHolder.getValue());
}
// ********** initialization **********
protected PropertyChangeListener buildPropertyChangeListener() {
return new SWTPropertyChangeListenerWrapper(this.buildPropertyChangeListener_());
}
protected PropertyChangeListener buildPropertyChangeListener_() {
return new PropertyChangeListener() {
public void propertyChanged(PropertyChangeEvent event) {
SpinnerModelAdapter.this.valueChanged(event);
}
@Override
public String toString() {
return "spinner listener";
}
};
}
protected ModifyListener buildSpinnerModifyListener() {
return new ModifyListener() {
public void modifyText(ModifyEvent e) {
SpinnerModelAdapter.this.spinnerModified(e);
}
@Override
public String toString() {
return "spinner selection listener";
}
};
}
protected DisposeListener buildSpinnerDisposeListener() {
return new DisposeListener() {
public void widgetDisposed(DisposeEvent event) {
SpinnerModelAdapter.this.spinnerDisposed(event);
}
@Override
public String toString() {
return "spinner dispose listener";
}
};
}
// ********** model events **********
protected void valueChanged(PropertyChangeEvent event) {
if (!this.locked) {
this.updateSpinner((Integer) event.getNewValue());
}
}
// ********** spinner events **********
protected void spinnerModified(ModifyEvent event) {
if (!this.locked) {
this.locked = true;
try {
this.numberHolder.setValue(this.spinner.getSelection());
}
finally {
this.locked = false;
}
}
}
protected void spinnerDisposed(DisposeEvent event) {
// the spinner is not yet "disposed" when we receive this event
// so we can still remove our listeners
this.spinner.removeDisposeListener(this.spinnerDisposeListener);
this.spinner.removeModifyListener(this.spinnerModifyListener);
this.numberHolder.removePropertyChangeListener(PropertyValueModel.VALUE, this.propertyChangeListener);
}
// ********** update **********
protected void updateSpinner(Integer value) {
if (this.spinner.isDisposed()) {
return;
}
// the model can be null, but the spinner cannot
if (value == null) {
value = defaultValue;
}
this.locked = true;
try {
this.spinner.setSelection(value);
}
finally {
this.locked = false;
}
}
// ********** standard methods **********
@Override
public String toString() {
return StringTools.buildToStringFor(this, this.numberHolder);
}
}
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