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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.jface.viewers.ITableLabelProvider;
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.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableItem;
/**
* This adapter can be used to keep a table item in synch with the properties of
* a model.
*/
@SuppressWarnings("nls")
public class TableItemModelAdapter {
/** The table item we synchronize with the model. */
protected final TableItem tableItem;
/**
* A listener that allows us to stop listening to stuff when the button
* is disposed.
*/
protected final DisposeListener tableItemDisposeListener;
/**
* Client-supplied adapter that provides with the various column settings and
* converts the objects in the LVM into an array of cell models.
*/
private ColumnAdapter<Object> columnAdapter;
/**
* The value models used to listen to each property that are display by the
* table item.
*/
private WritablePropertyValueModel<?>[] valueHolders;
/**
* The list of <code>PropertyChangeListener</code>s used to be notified when
* the properties of the model being display into a row change.
*/
private PropertyChangeListener[] propertyChangeListeners;
/**
* The label used to format the objects into a string representation.
*/
private ITableLabelProvider labelProvider;
// ********** static methods **********
/**
* Adapt the specified boolean to the specified button.
* If the boolean is null, the button's value will be "unselected".
*/
public static TableItemModelAdapter adapt(TableItem tableItem, ColumnAdapter<?> columnAdapter, ITableLabelProvider labelProvider) {
return new TableItemModelAdapter(tableItem, columnAdapter, labelProvider);
}
// ********** constructors **********
/**
* Constructor - the boolean holder and button are required.
*/
@SuppressWarnings("unchecked")
protected TableItemModelAdapter(TableItem tableItem, ColumnAdapter<?> columnAdapter, ITableLabelProvider labelProvider) {
super();
if (tableItem == null || columnAdapter == null || labelProvider == null) {
throw new NullPointerException();
}
this.tableItem = tableItem;
this.labelProvider = labelProvider;
this.columnAdapter = (ColumnAdapter<Object>) columnAdapter;
this.tableItemDisposeListener = this.buildTableItemDisposeListener();
this.tableItem.addDisposeListener(this.tableItemDisposeListener);
this.valueHolders = this.columnAdapter.cellModels(tableItem.getData());
this.propertyChangeListeners = this.buildPropertyChangeListeners();
for (int index = this.columnAdapter.columnCount(); --index >= 0; ) {
tableItemChanged(index, tableItem.getData(), false);
valueHolders[index].addPropertyChangeListener(PropertyValueModel.VALUE, propertyChangeListeners[index]);
}
}
// ********** initialization **********
private PropertyChangeListener[] buildPropertyChangeListeners() {
PropertyChangeListener[] listeners = new PropertyChangeListener[columnAdapter.columnCount()];
for (int index = listeners.length; --index >= 0; ) {
listeners[index] = buildPropertyChangeListener(index);
}
return listeners;
}
protected PropertyChangeListener buildPropertyChangeListener(int index) {
return new SWTPropertyChangeListenerWrapper(
this.buildPropertyChangeListener_(index)
);
}
protected PropertyChangeListener buildPropertyChangeListener_(int index) {
return new TableItemPropertyChangeListener(index);
}
protected DisposeListener buildTableItemDisposeListener() {
return new DisposeListener() {
public void widgetDisposed(DisposeEvent event) {
TableItemModelAdapter.this.tableItemDisposed(event);
}
@Override
public String toString() {
return "TableItem dispose listener";
}
};
}
// ********** behavior **********
protected void tableItemChanged(int index, Object subject, boolean revalidate) {
if (!this.tableItem.isDisposed()) {
this.updateTableItemText(index, subject);
this.updateTableItemImage(index, subject);
if (revalidate) {
this.layoutTable();
}
}
}
private void updateTableItemText(int index, Object subject) {
String text = this.labelProvider.getColumnText(subject, index);
if (text == null) {
text = "";
}
this.tableItem.setText(index, text);
}
private void updateTableItemImage(int index, Object subject) {
Image image = this.labelProvider.getColumnImage(subject, index);
this.tableItem.setImage(index, image);
}
private void layoutTable() {
// Refresh the table in order to show the scrollbar if required
Point size = this.tableItem.getParent().getParent().computeSize(SWT.DEFAULT, SWT.DEFAULT);
this.tableItem.getParent().setSize(size);
}
// ********** dispose **********
protected void tableItemDisposed(DisposeEvent event) {
// the button is not yet "disposed" when we receive this event
// so we can still remove our listeners
this.tableItem.removeDisposeListener(this.tableItemDisposeListener);
for (int index = valueHolders.length; --index >= 0; ) {
valueHolders[index].removePropertyChangeListener(PropertyValueModel.VALUE, propertyChangeListeners[index]);
}
}
// ********** standard methods **********
@Override
public String toString() {
return StringTools.buildToStringFor(this);
}
private class TableItemPropertyChangeListener implements PropertyChangeListener {
private final int index;
TableItemPropertyChangeListener(int index) {
super();
this.index = index;
}
public void propertyChanged(PropertyChangeEvent event) {
if (!tableItem.isDisposed()) {
Table table = tableItem.getParent();
tableItemChanged(index, tableItem.getData(), table.getColumnCount() == 0);
}
}
}
}
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