Mercurial > projects > dwt2
view org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/viewers/ViewerInputObservableValue.d @ 78:0a55d2d5a946
Added file for databinding
author | Frank Benoit <benoit@tionex.de> |
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date | Tue, 14 Apr 2009 11:35:29 +0200 |
parents | |
children | 6be48cf9f95c |
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/******************************************************************************* * Copyright (c) 2007 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 206839) *******************************************************************************/ module org.eclipse.jface.internal.databinding.viewers.ViewerInputObservableValue; import java.lang.all; import org.eclipse.core.databinding.observable.Diffs; import org.eclipse.core.databinding.observable.Realm; import org.eclipse.core.databinding.observable.value.AbstractObservableValue; import org.eclipse.jface.util.Util; import org.eclipse.jface.viewers.Viewer; /** * Observes the input of a <code>Viewer</code>. * <p> * This observer is blind to changes in the viewer's input unless its * {@link #setValue(Object)} method is called directly. * * @since 1.2 */ public class ViewerInputObservableValue : AbstractObservableValue { private final Viewer viewer; /** * Constructs a new instance associated with the provided <code>viewer</code>. * * @param realm * @param viewer */ public this( Realm realm, Viewer viewer ) { super( realm ); if ( viewer is null ) { throw new IllegalArgumentException( "The 'viewer' parameter is null." ); //$NON-NLS-1$ } this.viewer = viewer; } /** * Sets the input to the provided <code>value</code>. Value change events are * fired after input is set in the viewer. * * @param value object to set as input */ protected void doSetValue( Object value ) { Object oldValue = doGetValue(); viewer.setInput( value ); if ( !Util.equals( oldValue, value ) ) { fireValueChange( Diffs.createValueDiff( oldValue, value ) ); } } /** * Retrieves the current input. * * @return the current input */ protected Object doGetValue() { return viewer.getInput(); } public Object getValueType() { return null; } }