Add observeSelection()

* As replacement for the now deprecated
  SWTObservables.observeSelection()

Issue-Ref: 3569
Issue-Url: https://af3-developer.fortiss.org/issues/3569



Signed-off-by: Simon Barner <barner@fortiss.org>

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/util/.ratings

 ActionUtils.java 4553e487264e3d1f86f4767da4a7400cce4b9a5d GREEN
 ConstraintsUIUtils.java 69d5e08bbf768baf2790380e36f1020ef826a33e GREEN
 CopyPasteUtils.java bbc5cf9c9dc03ebf8dc75d42c919fe6eb60b388e GREEN
-DataBindingUtils.java 6ae66457694227b69c13c092ef62babdd4a2a137 GREEN
+DataBindingUtils.java 3a51d9b5681762dd40751e477aa4862baaed4052 YELLOW
 DragAndDropUtils.java 7aab91518aa12d76533a345bf6ed0be9ac7ff0e5 GREEN
 EObjectSelectionUtils.java 128cf8f96c6b9478171dff3deda662d5934f5f44 GREEN
 HierarchicalNameViewerComparator.java 199d82e392d4e437810cc65c0fc521dab52038e0 GREEN

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/util/DataBindingUtils.java

@@ -29,6 +29,7 @@ import org.eclipse.jface.databinding.swt.WidgetProperties;
 import org.eclipse.jface.fieldassist.ControlDecoration;
 import org.eclipse.swt.SWT;
 import org.eclipse.swt.widgets.Control;
+import org.eclipse.swt.widgets.Widget;
 
 /**
  * Utility methods for data binding support.
@@ -214,12 +215,25 @@ public final class DataBindingUtils {
 	 * @param control
 	 *            the source {@link Control}
 	 * @return an observable value observing this value property on the given
-	 *         widget
+	 *         {@link Control}.
 	 */
 	public static ISWTObservableValue observeText(Control control, final int event) {
 		return WidgetProperties.text(event).observe(control);
 	}
 
+	/**
+	 * Returns an {@link ISWTObservableValue} observing this value property on
+	 * the given {@link Widget}.
+	 *
+	 * @param widget
+	 *            the {@link Widget}
+	 * @return an observable value observing this value property on the given
+	 *         {@link Widget}.
+	 */
+	public static ISWTObservableValue observeSelection(Widget widget) {
+		return WidgetProperties.selection().observe(widget);
+	}
+
 	/**
 	 * Performs a complex binding of a cell editor control to a model element. The
 	 * validation is performed on modification (i.e. always), while model