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1 /*******************************************************************************
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2 * Copyright (c) 2007 Matthew Hall and others.
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3 * All rights reserved. This program and the accompanying materials
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4 * are made available under the terms of the Eclipse Public License v1.0
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5 * which accompanies this distribution, and is available at
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6 * http://www.eclipse.org/legal/epl-v10.html
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7 *
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8 * Contributors:
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9 * Matthew Hall - initial API and implementation (bug 206839)
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10 *******************************************************************************/
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11
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12 module org.eclipse.jface.internal.databinding.viewers.ViewerInputObservableValue;
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13
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14 import java.lang.all;
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15
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16 import org.eclipse.core.databinding.observable.Diffs;
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17 import org.eclipse.core.databinding.observable.Realm;
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18 import org.eclipse.core.databinding.observable.value.AbstractObservableValue;
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19 import org.eclipse.jface.util.Util;
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20 import org.eclipse.jface.viewers.Viewer;
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21
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22 /**
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23 * Observes the input of a <code>Viewer</code>.
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24 * <p>
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25 * This observer is blind to changes in the viewer's input unless its
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26 * {@link #setValue(Object)} method is called directly.
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27 *
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28 * @since 1.2
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29 */
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30 public class ViewerInputObservableValue : AbstractObservableValue {
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31
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32 private final Viewer viewer;
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33
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34 /**
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35 * Constructs a new instance associated with the provided <code>viewer</code>.
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36 *
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37 * @param realm
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38 * @param viewer
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39 */
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40 public this( Realm realm, Viewer viewer ) {
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41 super( realm );
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42 if ( viewer is null ) {
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43 throw new IllegalArgumentException( "The 'viewer' parameter is null." ); //$NON-NLS-1$
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44 }
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45
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46 this.viewer = viewer;
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47 }
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48
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49 /**
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50 * Sets the input to the provided <code>value</code>. Value change events are
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51 * fired after input is set in the viewer.
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52 *
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53 * @param value object to set as input
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54 */
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55 protected void doSetValue( Object value ) {
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56 Object oldValue = doGetValue();
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57 viewer.setInput( value );
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85
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58 if ( !Util.opEquals( oldValue, value ) ) {
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78
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59 fireValueChange( Diffs.createValueDiff( oldValue, value ) );
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60 }
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61 }
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62
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63 /**
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64 * Retrieves the current input.
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65 *
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66 * @return the current input
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67 */
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68 protected Object doGetValue() {
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69 return viewer.getInput();
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70 }
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71
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72 public Object getValueType() {
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73 return null;
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74 }
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75 }
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