TreeViewer added possibility for tooltip in DynamicTreeTableViewers

Extended DynamicTreeTableUIProviderBase to enable tooltips via
overwriting a respective getter.

Issue-ref: 4288
Issue-URL: af3#4288

Signed-off-by: Andreas Bayha <bayha@fortiss.org>

org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/.ratings

@@ -5,7 +5,7 @@ DynamicTextFieldTreeTableCell.java 62fa0c08b11d87e0eed41f84be85505c2740e75d GREE
 DynamicTreeContentProviderBase.java 91896b1fb5104d126544c44c1ff8c30f2a13a8d6 GREEN
 DynamicTreeItem.java 7e81ea98038b5eca90df583e0268d4e8f37aaf25 GREEN
 DynamicTreeItemBase.java d883066ecc181120302ca32f328538de7a45b093 GREEN
-DynamicTreeTableUIProviderBase.java 29aa753793ab90676d45e5b76b11f7b46ce02a97 GREEN
+DynamicTreeTableUIProviderBase.java e3dfec549343ec7371f2ecb321cb28563532dece YELLOW
 DynamicTreeTableViewer.java 77e9995a3bee37d57578dad9434a53c702128efa YELLOW
 DynamicTreeUIProviderBase.java 82d3c051213f0147f4c67ad247a08696cee73110 GREEN
 DynamicTreeViewer.java 33066062a82101cf28410e4d04f85bb9c24251db GREEN

org.fortiss.tooling.common.ui/src/org/fortiss/tooling/common/ui/javafx/control/treetableview/DynamicTreeTableUIProviderBase.java

@@ -28,6 +28,7 @@ import javafx.scene.Node;
 import javafx.scene.control.ComboBox;
 import javafx.scene.control.ContextMenu;
 import javafx.scene.control.TextField;
+import javafx.scene.control.Tooltip;
 import javafx.scene.control.TreeItem;
 import javafx.scene.control.TreeTableCell;
 import javafx.scene.control.TreeTableColumn;
@@ -64,6 +65,22 @@ public abstract class DynamicTreeTableUIProviderBase<T> {
 		return "";
 	}
 
+	/**
+	 * Retrieves the tooltip text which shall be displayed for the given element in the given
+	 * column.
+	 * 
+	 * No tooltip will be displayed, if this method return 'null'.
+	 * 
+	 * @param element
+	 *            The element to get a tooltip for.
+	 * @param column
+	 *            The column index for which to get a tooltip.
+	 * @return The tooltip as a {@link String}.
+	 */
+	public String getTooltip(T element, int column) {
+		return null;
+	}
+
 	/**
 	 * Determines, which {@link String} is in text editor cells when stating to edit.
 	 * 
@@ -322,6 +339,13 @@ public abstract class DynamicTreeTableUIProviderBase<T> {
 				final Node icon = getIconNode(data, columnIndex);
 				cell.setGraphic(icon);
 				cell.setStyle(getCellStyle(data, columnIndex));
+
+				final String tooltipStr = getTooltip(data, columnIndex);
+				if(tooltipStr != null) {
+					Tooltip tt = new Tooltip();
+					tt.setText(tooltipStr);
+					cell.setTooltip(tt);
+				}
 			} else {
 				// reset icon for cases, in which a row was styled before, but became empty by now.
 				cell.setGraphic(null);
@@ -603,7 +627,7 @@ public abstract class DynamicTreeTableUIProviderBase<T> {
 	 * {@link DynamicTreeViewer} due to the absence of proper selection interfaces in
 	 * JFX.
 	 */
-	private void addContextMenuHandler(TreeTableCell<T, String> cell, ContextMenu menu, T element) {
+	private void addContextMenuHandler(TreeTableCell<T, ?> cell, ContextMenu menu, T element) {
 		cell.getTreeTableView().addEventHandler(MouseEvent.MOUSE_RELEASED, e -> {
 			if(e.getButton() == MouseButton.SECONDARY) {
 				TreeItem<T> selected =