| /******************************************************************************* |
| * Copyright (c) 2008, 2009 Matthew Hall 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: |
| * Matthew Hall - initial API and implementation (bug 194734) |
| * Matthew Hall - bug 256543, 190881, 263691, 281723 |
| ******************************************************************************/ |
| |
| package org.eclipse.jface.internal.databinding.swt; |
| |
| import org.eclipse.core.databinding.observable.Diffs; |
| import org.eclipse.core.databinding.observable.value.DecoratingVetoableValue; |
| import org.eclipse.core.databinding.observable.value.IObservableValue; |
| import org.eclipse.core.runtime.Assert; |
| import org.eclipse.jface.databinding.swt.ISWTObservableValue; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.widgets.Event; |
| import org.eclipse.swt.widgets.Listener; |
| import org.eclipse.swt.widgets.Widget; |
| |
| /** |
| * @param <S> |
| * @since 3.3 |
| * |
| */ |
| public class SWTVetoableValueDecorator<S extends Widget> extends |
| DecoratingVetoableValue<String> implements ISWTObservableValue<String> { |
| private S widget; |
| private WidgetStringValueProperty<S> property; |
| |
| private Listener verifyListener = new Listener() { |
| public void handleEvent(Event event) { |
| String currentText = property.getValue(widget); |
| String newText = currentText.substring(0, event.start) + event.text |
| + currentText.substring(event.end); |
| if (!fireValueChanging(Diffs.createValueDiff(currentText, newText))) { |
| event.doit = false; |
| } |
| } |
| }; |
| |
| private Listener disposeListener = new Listener() { |
| public void handleEvent(Event event) { |
| SWTVetoableValueDecorator.this.dispose(); |
| } |
| }; |
| |
| /** |
| * @param widget |
| * @param property |
| * @param decorated |
| */ |
| public SWTVetoableValueDecorator(S widget, |
| WidgetStringValueProperty<S> property, |
| IObservableValue<String> decorated) { |
| super(decorated, true); |
| this.property = property; |
| this.widget = widget; |
| Assert.isTrue( |
| decorated.getValueType().equals(String.class), |
| "SWTVetoableValueDecorator can only decorate observable values of String value type"); //$NON-NLS-1$ |
| WidgetListenerUtil.asyncAddListener(widget, SWT.Dispose, |
| disposeListener); |
| } |
| |
| protected void firstListenerAdded() { |
| super.firstListenerAdded(); |
| WidgetListenerUtil.asyncAddListener(widget, SWT.Verify, verifyListener); |
| } |
| |
| protected void lastListenerRemoved() { |
| WidgetListenerUtil.asyncRemoveListener(widget, SWT.Verify, |
| verifyListener); |
| super.lastListenerRemoved(); |
| } |
| |
| public synchronized void dispose() { |
| WidgetListenerUtil.asyncRemoveListener(widget, SWT.Verify, |
| verifyListener); |
| WidgetListenerUtil.asyncRemoveListener(widget, SWT.Dispose, |
| disposeListener); |
| this.widget = null; |
| super.dispose(); |
| } |
| |
| public S getWidget() { |
| return widget; |
| } |
| } |