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/*****************************************************************************
* Copyright (c) 2011 CEA LIST.
*
* 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:
* Camille Letavernier (CEA LIST) camille.letavernier@cea.fr - Initial API and implementation
* Thibault Le Ouay t.leouay@sherpa-eng.com - Add binding implementation
*****************************************************************************/
package org.eclipse.papyrus.uml.properties.widgets;
import java.util.HashSet;
import java.util.Set;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.papyrus.infra.properties.ui.modelelement.ModelElement;
import org.eclipse.papyrus.infra.widgets.editors.AbstractValueEditor;
import org.eclipse.papyrus.uml.properties.expression.ExpressionList.Expression;
import org.eclipse.papyrus.uml.properties.preferences.LanguageRegistry;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
/**
* An editor to edit an expression body.
* Depending on the matching language, a different widget will be used to edit
* the expression body.
*
* @author Camille Letavernier
*
*/
public class DynamicBodyEditor extends AbstractValueEditor implements Listener {
private BodyEditor currentEditor;
private final Composite bodyEditorContainer;
private final Set<Listener> changeListeners = new HashSet<Listener>();
private boolean readOnly = false;
private ModelElement context = null;
/**
*
* Constructor.
*
* @param parent
* The composite in which the widget will be displayed
* @param style
* The widget's composite style
*/
public DynamicBodyEditor(Composite parent, int style) {
super(parent, style);
bodyEditorContainer = new Composite(this, style);
bodyEditorContainer.setLayout(new FillLayout());
bodyEditorContainer.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
currentEditor = new NullBodyEditor();
currentEditor.createWidget(bodyEditorContainer, SWT.NONE);
}
/**
* Sets the {@link Expression} to edit.
* This will refresh the widget used to edit the expression body.
*
* @param expression
* the expression to edit
*/
public void display(Expression expression) {
if (currentEditor != null) {
disposeBodyEditor();
}
BodyEditor editor;
if (expression == null) {
editor = new NullBodyEditor();
editor.createWidget(bodyEditorContainer, SWT.NONE);
bodyEditorContainer.layout();
return;
}
String language = expression.getLanguage();
String initialText = expression.getBody();
editor = getEditor(language);
editor.createWidget(bodyEditorContainer, SWT.NONE);
if (context != null) {
editor.setContext(context);
}
editor.setInput(initialText);
editor.addChangeListener(this);
editor.setReadOnly(readOnly);
bodyEditorContainer.layout();
currentEditor = editor;
}
/**
* Adds a listener to this object
* Events will be fired when the body has changed
*
* @param listener
*/
// TODO : isn't it simply a commit listener ?
public void addChangeListener(Listener listener) {
changeListeners.add(listener);
}
/**
* Removes a listener from this object
*
* @param listener
*/
public void removeChangeListener(Listener listener) {
changeListeners.remove(listener);
}
private BodyEditor getEditor(String language) {
return LanguageRegistry.instance.getEditorFor(language);
}
private void disposeBodyEditor() {
currentEditor.removeChangeListener(this);
currentEditor.dispose();
if (null != bodyEditorContainer && !bodyEditorContainer.isDisposed()) {
for (Control control : bodyEditorContainer.getChildren()) {
control.dispose();
}
}
}
@Override
public String getValue() {
if (currentEditor != null) {
return currentEditor.getValue();
}
return null;
}
@Override
public Object getEditableType() {
return String.class;
}
@Override
public void setReadOnly(boolean readOnly) {
if (currentEditor != null) {
currentEditor.setReadOnly(readOnly);
}
this.readOnly = readOnly;
}
@Override
public boolean isReadOnly() {
return readOnly;
}
@Override
public void setToolTipText(String text) {
super.setLabelToolTipText(text);
}
public void handleEvent(Event event) {
for (Listener listener : changeListeners) {
listener.handleEvent(event);
}
}
@Override
protected GridData getLabelLayoutData() {
GridData result = super.getLabelLayoutData();
result.verticalAlignment = SWT.BEGINNING;
return result;
}
/**
* Sets the ModelElement used by this editor
*
* @param modelElement
*/
public void setContext(ModelElement modelElement) {
this.context = modelElement;
if (currentEditor != null) {
currentEditor.setContext(context);
}
}
@Override
public void updateStatus(IStatus status) {
}
@Override
public void changeColorField() {
}
}
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