Add single node selection support

Author: mbastian

modules/engine-core/src/main/java/org/gephi/viz/engine/status/GraphSelection.java

@@ -12,9 +12,12 @@
  */
 public interface GraphSelection {
 
-     enum GraphSelectionMode {
+    enum GraphSelectionMode {
         SIMPLE_MOUSE_SELECTION,
-        RECTANGLE_SELECTION, NO_SELECTION, CUSTOM_SELECTION
+        SINGLE_NODE_SELECTION,
+        RECTANGLE_SELECTION,
+        NO_SELECTION,
+        CUSTOM_SELECTION
     }
 
     boolean someNodesOrEdgesSelection();

modules/opengl-commons/src/main/java/org/gephi/viz/engine/util/actions/InputActionsProcessor.java

@@ -49,6 +49,7 @@ public void clearSelection() {
 
     public void selectNodes(final NodeIterable nodesIterable) {
         final GraphSelection selection = engine.getLookup().lookup(GraphSelection.class);
+        GraphSelection.GraphSelectionMode mode = selection.getMode();
         final GraphRenderingOptions renderingOptions = engine.getLookup().lookup(GraphRenderingOptions.class);
         final Graph graph = engine.getGraphModel().getGraphVisible();
 
@@ -57,7 +58,7 @@ public void selectNodes(final NodeIterable nodesIterable) {
         final Set<Node> selectionNeighbours = new HashSet<>();
         final Set<Edge> selectionEdges = new HashSet<>();
 
-        final boolean selectNeighbours = renderingOptions.isAutoSelectNeighbours();
+        final boolean selectNeighbours = renderingOptions.isAutoSelectNeighbours() && mode != GraphSelection.GraphSelectionMode.SINGLE_NODE_SELECTION;
         try {
             while (iterator.hasNext()) {
                 final Node node = iterator.next();

modules/opengl-jogl/src/main/java/org/gephi/viz/engine/jogl/pipeline/DefaultJOGLEventListener.java

@@ -45,7 +45,7 @@ public void frameStart() {
     public void frameEnd() {
         if (lastMovedPosition != null) {
             //TODO: move to independent selection input listener
-            if (graphSelection.getMode() == GraphSelection.GraphSelectionMode.SIMPLE_MOUSE_SELECTION) {
+            if (graphSelection.getMode() == GraphSelection.GraphSelectionMode.SIMPLE_MOUSE_SELECTION || graphSelection.getMode() == GraphSelection.GraphSelectionMode.SINGLE_NODE_SELECTION) {
                 final Vector2f worldCoords = engine.screenCoordinatesToWorldCoordinates(lastMovedPosition.getX(), lastMovedPosition.getY());
                 inputActionsProcessor.selectNodesUnderPosition(worldCoords);
             }
@@ -105,6 +105,8 @@ public boolean mouseClicked(MouseEvent e) {
         } else if (graphSelection.getMode() == GraphSelection.GraphSelectionMode.SIMPLE_MOUSE_SELECTION && leftClick) {
             //TODO: move to independent selection input listener
             return true;
+        } else if (graphSelection.getMode() == GraphSelection.GraphSelectionMode.SINGLE_NODE_SELECTION && leftClick) {
+            return true;
         } else if (graphSelection.getMode() == GraphSelection.GraphSelectionMode.RECTANGLE_SELECTION) {
             inputActionsProcessor.clearSelection();
             return true;