diff options
Diffstat (limited to 'plugins/xwt/org.eclipse.papyrus.xwt/src/org/eclipse/papyrus/xwt/databinding/XWTObservableValue.java')
| -rw-r--r-- | plugins/xwt/org.eclipse.papyrus.xwt/src/org/eclipse/papyrus/xwt/databinding/XWTObservableValue.java | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/plugins/xwt/org.eclipse.papyrus.xwt/src/org/eclipse/papyrus/xwt/databinding/XWTObservableValue.java b/plugins/xwt/org.eclipse.papyrus.xwt/src/org/eclipse/papyrus/xwt/databinding/XWTObservableValue.java new file mode 100644 index 00000000000..5da1f172c7a --- /dev/null +++ b/plugins/xwt/org.eclipse.papyrus.xwt/src/org/eclipse/papyrus/xwt/databinding/XWTObservableValue.java @@ -0,0 +1,147 @@ +/*******************************************************************************
+ * Copyright (c) 2006, 2010 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.papyrus.xwt.databinding;
+
+import org.eclipse.core.databinding.conversion.IConverter;
+import org.eclipse.core.databinding.observable.Diffs;
+import org.eclipse.core.databinding.observable.IObserving;
+import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
+import org.eclipse.core.databinding.observable.value.ValueDiff;
+import org.eclipse.jface.util.Util;
+import org.eclipse.papyrus.xwt.XWT;
+
+/**
+ * Notes: Binding type is java.lang.String.
+ *
+ * @author jliu (jin.liu@soyatec.com)
+ */
+public abstract class XWTObservableValue extends AbstractObservableValue implements IObserving {
+
+ private Object observed;
+
+ private Class<?> valueType;
+
+ private EventManager eventManager;
+
+ private EventListener eventListener;
+
+ private String path;
+
+ private boolean updating = false;
+
+ /**
+ *
+ */
+ public XWTObservableValue(Class<?> valueType, Object observed, String path) {
+ super(XWT.getRealm());
+ this.valueType = valueType;
+ this.observed = observed;
+ this.path = path;
+ init();
+ }
+
+ /**
+ * Add listener to observed.
+ */
+ private void init() {
+ if(eventListener == null) {
+ eventListener = new EventListener() {
+
+ public void handleEvent(Event evt) {
+ if(!updating) {
+ final ValueDiff diff = Diffs.createValueDiff(evt.getOldValue(), evt.getNewValue());
+ getRealm().exec(new Runnable() {
+
+ public void run() {
+ fireValueChange(diff);
+ }
+ });
+ }
+ }
+ };
+ }
+ eventManager = EventManager.getEventManager(observed, getRealm());
+ eventManager.addEventListener(path, eventListener);
+ }
+
+ /**
+ * @return the observed
+ */
+ public Object getObserved() {
+ return observed;
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.eclipse.core.databinding.observable.value.AbstractObservableValue#doSetValue(java.lang.Object)
+ */
+ protected void doSetValue(Object value) {
+ updating = true;
+ Object oldValue = doGetValue();
+ value = convert(oldValue == null ? null : oldValue.getClass(), value);
+ if(!Util.equals(oldValue, value)) {
+ doSetApprovedValue(value);
+ fireValueChange(Diffs.createValueDiff(oldValue, value));
+ eventManager.dispatchEvent(new Event(observed, oldValue, value, getPath()));
+ }
+ updating = false;
+ }
+
+ /**
+ * @param value
+ * @return
+ */
+ protected Object convert(Class type, Object value) {
+ if(value != null) {
+ if(type != null && type.isEnum() && value instanceof String) {
+ return Enum.valueOf(type, (String)value);
+ }
+ IConverter c = XWT.findConvertor(value.getClass(), (Class<?>)getValueType());
+ if(c != null) {
+ return c.convert(value);
+ }
+ }
+ return value;
+ }
+
+ /**
+ * @param value
+ */
+ protected abstract void doSetApprovedValue(Object value);
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.eclipse.core.databinding.observable.value.AbstractObservableValue#doGetValue()
+ */
+ protected Object doGetValue() {
+ return observed;
+ }
+
+ /*
+ * (non-Javadoc)
+ *
+ * @see org.eclipse.core.databinding.observable.value.IObservableValue#getValueType()
+ */
+ public Class<?> getValueType() {
+ return valueType;
+ }
+
+ public String getPath() {
+ return path;
+ }
+
+ public void setPath(String path) {
+ this.path = path;
+ }
+
+}
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