| /******************************************************************************* |
| * Copyright (c) 2005, 2007 IBM Corporation 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: |
| * IBM Corporation - initial API and implementation |
| * Brad Reynolds - bug 164653 |
| *******************************************************************************/ |
| package org.eclipse.jface.internal.databinding.internal.swt; |
| |
| import org.eclipse.core.databinding.observable.Diffs; |
| import org.eclipse.core.databinding.observable.Realm; |
| import org.eclipse.jface.internal.databinding.provisional.swt.AbstractSWTObservableValue; |
| import org.eclipse.jface.util.Assert; |
| import org.eclipse.swt.events.ModifyEvent; |
| import org.eclipse.swt.events.ModifyListener; |
| import org.eclipse.swt.widgets.Spinner; |
| |
| /** |
| * @since 1.0 |
| * |
| */ |
| public class SpinnerObservableValue extends AbstractSWTObservableValue { |
| |
| private final Spinner spinner; |
| |
| private final String attribute; |
| |
| private boolean updating = false; |
| |
| private int currentSelection; |
| |
| /** |
| * @param spinner |
| * @param attribute |
| */ |
| public SpinnerObservableValue(Spinner spinner, String attribute) { |
| super(spinner); |
| this.spinner = spinner; |
| this.attribute = attribute; |
| init(); |
| } |
| |
| /** |
| * @param realm |
| * @param spinner |
| * @param attribute |
| */ |
| public SpinnerObservableValue(Realm realm, Spinner spinner, String attribute) { |
| super(realm, spinner); |
| this.spinner = spinner; |
| this.attribute = attribute; |
| init(); |
| } |
| |
| private void init() { |
| if (attribute.equals(SWTProperties.SELECTION)) { |
| currentSelection = spinner.getSelection(); |
| spinner.addModifyListener(new ModifyListener() { |
| public void modifyText(ModifyEvent e) { |
| if (!updating) { |
| int newSelection = SpinnerObservableValue.this.spinner |
| .getSelection(); |
| notifyIfChanged(currentSelection, newSelection); |
| currentSelection = newSelection; |
| } |
| } |
| }); |
| } else if (!attribute.equals(SWTProperties.MIN) |
| && !attribute.equals(SWTProperties.MAX)) { |
| throw new IllegalArgumentException( |
| "Attribute name not valid: " + attribute); //$NON-NLS-1$ |
| } |
| } |
| |
| public void doSetValue(final Object value) { |
| int oldValue; |
| int newValue; |
| try { |
| updating = true; |
| newValue = ((Integer) value).intValue(); |
| if (attribute.equals(SWTProperties.SELECTION)) { |
| oldValue = spinner.getSelection(); |
| spinner.setSelection(newValue); |
| currentSelection = newValue; |
| } else if (attribute.equals(SWTProperties.MIN)) { |
| oldValue = spinner.getMinimum(); |
| spinner.setMinimum(newValue); |
| } else if (attribute.equals(SWTProperties.MAX)) { |
| oldValue = spinner.getMaximum(); |
| spinner.setMaximum(newValue); |
| } else { |
| Assert.isTrue(false, "invalid attribute name:" + attribute); //$NON-NLS-1$ |
| return; |
| } |
| notifyIfChanged(oldValue, newValue); |
| } finally { |
| updating = false; |
| } |
| } |
| |
| public Object doGetValue() { |
| int value = 0; |
| if (attribute.equals(SWTProperties.SELECTION)) { |
| value = spinner.getSelection(); |
| } else if (attribute.equals(SWTProperties.MIN)) { |
| value = spinner.getMinimum(); |
| } else if (attribute.equals(SWTProperties.MAX)) { |
| value = spinner.getMaximum(); |
| } |
| return new Integer(value); |
| } |
| |
| public Object getValueType() { |
| return Integer.TYPE; |
| } |
| |
| /** |
| * @return attribute being observed |
| */ |
| public String getAttribute() { |
| return attribute; |
| } |
| |
| private void notifyIfChanged(int oldValue, int newValue) { |
| if (oldValue != newValue) { |
| fireValueChange(Diffs.createValueDiff(new Integer(oldValue), |
| new Integer(newValue))); |
| } |
| } |
| } |