/*******************************************************************************
* Copyright (c) 2006, 2008 Soyatec (http://www.soyatec.com) and others.
* 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:
* Soyatec - initial API and implementation
*******************************************************************************/
package org.eclipse.e4.xwt.core;
import java.util.HashMap;
import org.eclipse.core.databinding.conversion.IConverter;
import org.eclipse.core.databinding.observable.ChangeEvent;
import org.eclipse.core.databinding.observable.IObservable;
import org.eclipse.core.databinding.observable.value.IObservableValue;
import org.eclipse.e4.xwt.XWT;
import org.eclipse.e4.xwt.XWTException;
import org.eclipse.e4.xwt.databinding.JFaceXWTDataBinding;
import org.eclipse.e4.xwt.internal.core.ScopeManager;
import org.eclipse.e4.xwt.internal.core.UpdateSourceTrigger;
import org.eclipse.e4.xwt.internal.utils.LoggerManager;
import org.eclipse.e4.xwt.internal.utils.UserData;
import org.eclipse.swt.widgets.Widget;
public class Trigger extends TriggerBase {
private String property;
private String sourceName;
private Operator operator = Operator.EQ;
private Object value;
private SetterBase[] setters;
public Operator getOperator() {
return operator;
}
public void setOperator(Operator operator) {
this.operator = operator;
}
public String getProperty() {
return property;
}
public void setProperty(String property) {
this.property = property;
}
public String getSourceName() {
return sourceName;
}
public void setSourceName(String sourceName) {
this.sourceName = sourceName;
}
public Object getValue() {
return value;
}
public void setValue(Object value) {
this.value = value;
}
public SetterBase[] getSetters() {
if (setters == null) {
return SetterBase.EMPTY_SETTERS;
}
return setters;
}
public void setSetters(SetterBase[] setters) {
this.setters = setters;
}
public void on(Object target) {
}
public void prepare(Object target) {
if (property != null) {
final Object source = getElementByName(target, sourceName);
if (source == null) {
throw new XWTException("No element is found with the name = " + sourceName);
}
IObservable observableValue = ScopeManager.observeValue(source, source, property, UpdateSourceTrigger.PropertyChanged);
observableValue.addChangeListener(new AbstractChangeListener(target) {
public void handleChange(ChangeEvent event) {
Class<?> valueType = JFaceXWTDataBinding.getValueType(source.getClass(), property);
if (valueType == null) {
LoggerManager.log("Type of the property " + property + " is not found in " + source
.getClass().getName());
return;
}
Widget widget = UserData.getWidget(source);
if (widget == null) {
return;
}
//
// test value ==
//
Object realValue = value;
if (value != null) {
IConverter converter = XWT.findConvertor(value.getClass(), valueType);
if (converter != null) {
realValue = converter.convert(value);
}
}
Object newValue = event.getSource();
if (newValue instanceof IObservableValue) {
IObservableValue observableValue = (IObservableValue) newValue;
newValue = observableValue.getValue();
}
if (newValue != null) {
IConverter newConverter = XWT.findConvertor(newValue.getClass(), valueType);
if (newConverter != null) {
newValue = newConverter.convert(newValue);
}
}
if (!Operator.compare(newValue, operator, realValue)) {
restoreValues();
return;
}
if (oldvalues != null) {
return;
}
for (SetterBase setter : getSetters()) {
try {
Object oldValue = setter.applyTo(element, true);
if (oldvalues == null) {
oldvalues = new HashMap<SetterBase, Object>();
}
oldvalues.put(setter, oldValue);
} catch (RuntimeException e) {
continue;
}
}
}
});
}
}
}