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/*******************************************************************************
* Copyright (c) 2007, 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.ui.internal.swt;
import org.eclipse.jpt.ui.internal.listeners.SWTPropertyChangeListenerWrapper;
import org.eclipse.jpt.utility.internal.StringTools;
import org.eclipse.jpt.utility.model.event.PropertyChangeEvent;
import org.eclipse.jpt.utility.model.listener.PropertyChangeListener;
import org.eclipse.jpt.utility.model.value.PropertyValueModel;
import org.eclipse.jpt.utility.model.value.WritablePropertyValueModel;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.widgets.Button;
/**
* This adapter can be used to keep a check box or toggle button in synch with
* a model boolean.
*/
@SuppressWarnings("nls")
public class BooleanButtonModelAdapter {
/** A value model on the underlying model boolean. */
protected final WritablePropertyValueModel<Boolean> booleanHolder;
/**
* A listener that allows us to synchronize the button's selection state with
* the model boolean.
*/
protected final PropertyChangeListener booleanChangeListener;
/** The check box/toggle button we synchronize with the model boolean. */
protected final Button button;
/**
* A listener that allows us to synchronize the model boolean with
* the button's selection state.
*/
protected final SelectionListener buttonSelectionListener;
/**
* A listener that allows us to stop listening to stuff when the button
* is disposed.
*/
protected final DisposeListener buttonDisposeListener;
/**
* The default setting for the check box/toggle button; for when the
* underlying model is null.
* The default [default value] is false (i.e. the button is checked/popped out).
*/
protected final boolean defaultValue;
// ********** static methods **********
/**
* Adapt the specified boolean to the specified button.
* If the boolean is null, the button's value will be "unselected".
*/
public static BooleanButtonModelAdapter adapt(WritablePropertyValueModel<Boolean> booleanHolder, Button button) {
return new BooleanButtonModelAdapter(booleanHolder, button);
}
/**
* Adapt the specified boolean to the specified button.
* If the boolean is null, the button's value will be the specified default value.
*/
public static BooleanButtonModelAdapter adapt(WritablePropertyValueModel<Boolean> booleanHolder, Button button, boolean defaultValue) {
return new BooleanButtonModelAdapter(booleanHolder, button, defaultValue);
}
// ********** constructors **********
/**
* Constructor - the boolean holder and button are required.
* The default value will be false.
*/
protected BooleanButtonModelAdapter(WritablePropertyValueModel<Boolean> booleanHolder, Button button) {
this(booleanHolder, button, false);
}
/**
* Constructor - the boolean holder and button are required.
*/
protected BooleanButtonModelAdapter(WritablePropertyValueModel<Boolean> booleanHolder, Button button, boolean defaultValue) {
super();
if ((booleanHolder == null) || (button == null)) {
throw new NullPointerException();
}
this.booleanHolder = booleanHolder;
this.button = button;
this.defaultValue = defaultValue;
this.booleanChangeListener = this.buildBooleanChangeListener();
this.booleanHolder.addPropertyChangeListener(PropertyValueModel.VALUE, this.booleanChangeListener);
this.buttonDisposeListener = this.buildButtonDisposeListener();
this.button.addDisposeListener(this.buttonDisposeListener);
this.buttonSelectionListener = this.buildButtonSelectionListener();
this.button.addSelectionListener(this.buttonSelectionListener);
this.setButtonSelection(this.booleanHolder.getValue());
}
// ********** initialization **********
protected PropertyChangeListener buildBooleanChangeListener() {
return new SWTPropertyChangeListenerWrapper(this.buildBooleanChangeListener_());
}
protected PropertyChangeListener buildBooleanChangeListener_() {
return new PropertyChangeListener() {
public void propertyChanged(PropertyChangeEvent event) {
BooleanButtonModelAdapter.this.booleanChanged(event);
}
@Override
public String toString() {
return "boolean listener";
}
};
}
protected SelectionListener buildButtonSelectionListener() {
return new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent event) {
BooleanButtonModelAdapter.this.buttonSelected(event);
}
@Override
public String toString() {
return "button selection listener";
}
};
}
protected DisposeListener buildButtonDisposeListener() {
return new DisposeListener() {
public void widgetDisposed(DisposeEvent event) {
BooleanButtonModelAdapter.this.buttonDisposed(event);
}
@Override
public String toString() {
return "button dispose listener";
}
};
}
// ********** behavior **********
/**
* The model has changed - synchronize the button.
* If the new model value is null, use the adapter's default value
* (which is typically false).
*/
protected void booleanChanged(PropertyChangeEvent event) {
this.setButtonSelection((Boolean) event.getNewValue());
}
protected void setButtonSelection(Boolean b) {
if (this.button.isDisposed()) {
return;
}
this.button.setSelection(this.booleanValue(b));
}
protected boolean booleanValue(Boolean b) {
return (b != null) ? b.booleanValue() : this.defaultValue();
}
protected boolean defaultValue() {
return this.defaultValue;
}
/**
* The button has been "selected" - synchronize the model.
*/
protected void buttonSelected(SelectionEvent event) {
if (this.button.isDisposed()) {
return;
}
this.booleanHolder.setValue(Boolean.valueOf(this.button.getSelection()));
}
// ********** dispose **********
protected void buttonDisposed(DisposeEvent event) {
// the button is not yet "disposed" when we receive this event
// so we can still remove our listeners
this.button.removeSelectionListener(this.buttonSelectionListener);
this.button.removeDisposeListener(this.buttonDisposeListener);
this.booleanHolder.removePropertyChangeListener(PropertyValueModel.VALUE, this.booleanChangeListener);
}
// ********** standard methods **********
@Override
public String toString() {
return StringTools.buildToStringFor(this, this.booleanHolder);
}
}
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