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/*****************************************************************************
* Copyright (c) 2010 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:
* Remi Schnekenburger (CEA LIST) remi.schnekenburger@cea.fr - Initial API and implementation
*****************************************************************************/
package org.eclipse.papyrus.properties.runtime.propertyeditor;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.papyrus.properties.runtime.Activator;
import org.eclipse.papyrus.properties.runtime.propertyeditor.descriptor.IBoundedValuesPropertyEditorDescriptor;
import org.eclipse.papyrus.properties.runtime.propertyeditor.descriptor.IPropertyEditorDescriptor;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Composite;
/**
* Property editors for enumeration
*/
public class RadioBoxPropertyEditor extends AbstractPropertyEditor {
/** id of this editor */
public static final String ID = "org.eclipse.papyrus.properties.runtime.radioBoxPropertyEditor";
/** main composite created by this property editor */
protected Composite composite;
/** list of available elements */
protected List<String> values = new ArrayList<String>();
/** list of radio buttons */
protected List<Button> buttons = new ArrayList<Button>();
/** listener for the radio buttons */
protected SelectionListener listener = new RadioButtonListener();
/**
* Creates a new RadioBoxPropertyEditor
*/
public RadioBoxPropertyEditor() {
}
/**
* {@inheritDoc}
*/
@Override
public Composite createContent(Composite parent) {
composite = getWidgetFactory().createComposite(parent, SWT.NONE);
int columnNu = getColumnNumber();
GridLayout layout = new GridLayout(columnNu, false);
layout.marginHeight = 0;
layout.marginWidth = 0;
composite.setLayout(layout);
GridData data = new GridData(SWT.FILL, SWT.FILL, true, false);
composite.setLayoutData(data);
if((getDescriptor().getLabelPosition() & (SWT.LEFT | SWT.TOP)) != 0) {
createLabel(composite);
}
// create the set of radio-boxes. Does not know the size of the grid used for this editor
for(String value : values) {
Button button = getWidgetFactory().createButton(composite, (!value.equals("") ? value : "<Unset>"), SWT.RADIO);
if(!getIsReadOnly()) {
button.setEnabled(true);
button.addSelectionListener(listener);
} else {
button.setEnabled(false);
}
buttons.add(button);
button.setToolTipText(getTooltipText());
}
if((getDescriptor().getLabelPosition() & (SWT.RIGHT | SWT.BOTTOM)) != 0) {
createLabel(composite);
}
return composite;
}
/**
* Returns the number of column for the composite
*
* @return the number of column for the composite
*/
protected int getColumnNumber() {
return values.size() + ((((getDescriptor().getLabelPosition() & SWT.RIGHT | SWT.LEFT)) != 0) ? 1 : 0);
}
/**
* {@inheritDoc}
*/
@Override
public void dispose() {
if(isValid(composite)) {
composite.dispose();
composite = null;
buttons.clear();
listener = null;
setController(null);
}
}
/**
* {@inheritDoc}
*/
@Override
public boolean isDisposed() {
if(composite == null) {
return true;
}
return composite.isDisposed();
}
/**
* Returns the current String value or <code>null</code> if no elements were selected
*/
@Override
public Object getValue() {
if(isValid(buttons)) {
for(Button button : buttons) {
// check if the button is selected
if(button.getSelection()) {
// returns the value in the list at the same index of the index of the button in the list of buttons
return values.get(buttons.indexOf(button));
}
}
} else {
Activator.log.error("trying to read the value of the combo whereas the combo is disposed", null);
}
return null;
}
/**
* {@inheritDoc}
*/
@Override
public void handleContentChanged() {
// this should tells the controller that the input has to be applied to the model
getController().updateModel();
}
/**
* {@inheritDoc}
*/
@Override
public IStatus init(IPropertyEditorDescriptor descriptor) {
setDescriptor(descriptor);
setTooltipText(descriptor.getTooltipText());
if(descriptor instanceof IBoundedValuesPropertyEditorDescriptor) {
if(((IBoundedValuesPropertyEditorDescriptor)descriptor).getAvailableValues() != null) {
for(Object object : ((IBoundedValuesPropertyEditorDescriptor)descriptor).getAvailableValues()) {
this.values.add(object.toString());
}
}
return Status.OK_STATUS;
}
return new Status(IStatus.ERROR, Activator.ID, "Impossible to initialize the editor using descriptor :" + descriptor);
}
/**
* {@inheritDoc}
*/
@Override
public void setValue(Object valueToEdit) {
if(!isValid(buttons)) {
return;
}
if(valueToEdit instanceof String) {
String newValue = (String)valueToEdit;
int index = values.indexOf(newValue);
if(index >= 0) {
// force all to not selected. Prefer to set all to false, then the right one to true.
// this should be faster than testing for each button
for(Button button : buttons) {
button.setSelection(false);
}
// select only the right one
buttons.get(index).setSelection(true);
} else {
Activator.log.error("Impossible to get the value " + valueToEdit + " in the list of available values", null);
}
}
}
/**
* Returns <code>true</code> if the list is not <code>null</code> neither empty and buttons inside list are not <code>null</code>.
*
* @param buttons
* the list of buttons to test
* @return <code>true</code> if the list is not <code>null</code> neither empty and buttons inside list are not <code>null</code>.
*/
protected boolean isValid(List<Button> buttons) {
return buttons != null && !buttons.isEmpty() && !(buttons.get(0).isDisposed());
}
/**
* Selection Listener for a list of radio buttons
*/
protected class RadioButtonListener implements SelectionListener {
/**
* {@inheritDoc}
*/
public void widgetSelected(SelectionEvent e) {
for(Button button : buttons) {
button.setSelection(false);
}
((Button)e.widget).setSelection(true);
handleContentChanged();
}
/**
* {@inheritDoc}
*/
public void widgetDefaultSelected(SelectionEvent e) {
}
}
}
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