added a drag and drop to scroll feature to the node editor with the mouse wheel click.

jme3-materialeditor/src/com/jme3/gde/materialdefinition/editor/BackdropPanel.java

@@ -8,12 +8,14 @@ package com.jme3.gde.materialdefinition.editor;
 import com.jme3.gde.materials.MaterialPreviewRenderer;
 import com.jme3.material.Material;
 import java.awt.Container;
+import java.awt.Point;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.ComponentAdapter;
 import java.awt.event.ComponentEvent;
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
+import java.awt.event.MouseMotionListener;
 import javax.swing.JScrollPane;
 import javax.swing.JViewport;
 import javax.swing.SwingUtilities;
@@ -25,7 +27,7 @@ import javax.swing.event.ChangeListener;
  *
  * @author Nehon
  */
-public class BackdropPanel extends javax.swing.JPanel implements MouseListener, ChangeListener {
+public class BackdropPanel extends javax.swing.JPanel implements MouseListener, ChangeListener,MouseMotionListener {
 
     private final MaterialPreviewRenderer renderer;
     private Material mat;
@@ -40,6 +42,7 @@ public class BackdropPanel extends javax.swing.JPanel implements MouseListener,
         setLayout(null);
         toolBar.setVisible(false);
         addMouseListener(this);
+        addMouseMotionListener(this);
         renderer = new MaterialPreviewRenderer(previewLabel);
         recalculateTimer.setRepeats(false);
         addComponentListener(new ComponentAdapter() {
@@ -399,6 +402,10 @@ public class BackdropPanel extends javax.swing.JPanel implements MouseListener,
 
     @Override
     public void mousePressed(MouseEvent e) {
+        Container c = getParent();
+        if (c != null) {
+            ((MouseListener) c).mousePressed(SwingUtilities.convertMouseEvent(this, e, c));
+        }
     }
 
     @Override
@@ -448,8 +455,8 @@ public class BackdropPanel extends javax.swing.JPanel implements MouseListener,
             int size = Math.min(width, height) - 25;
             setSize(size, size);
             setBounds(0, 0, size, size);
-
-            setLocation(pane.getHorizontalScrollBar().getValue() + width / 2 - size / 2, pane.getVerticalScrollBar().getValue() + height / 2 - size / 2);
+            Point pos= viewPort.getViewPosition();
+            setLocation(pos.x + width / 2 - size / 2, pos.y + height / 2 - size / 2);
 
             repaint();
             if (recalculateTimer.isRunning()) {
@@ -467,4 +474,18 @@ public class BackdropPanel extends javax.swing.JPanel implements MouseListener,
         }
     }
 
+    public void mouseDragged(MouseEvent e) {
+        Container c = getParent();
+        if (c != null) {
+            ((MouseMotionListener) c).mouseDragged(SwingUtilities.convertMouseEvent(this, e, c));
+        }
+    }
+
+    public void mouseMoved(MouseEvent e) {
+        Container c = getParent();
+        if (c != null) {
+            ((MouseMotionListener) c).mouseMoved(SwingUtilities.convertMouseEvent(this, e, c));
+        }
+    }
+
 }

jme3-materialeditor/src/com/jme3/gde/materialdefinition/editor/Diagram.java

@@ -19,10 +19,12 @@ import com.jme3.shader.UniformBinding;
 import com.jme3.shader.VarType;
 import java.awt.Color;
 import java.awt.Component;
+import java.awt.Cursor;
 import java.awt.Dimension;
 import java.awt.Font;
 import java.awt.Graphics;
 import java.awt.Point;
+import java.awt.Rectangle;
 import java.awt.event.ActionEvent;
 import java.awt.event.ActionListener;
 import java.awt.event.ComponentEvent;
@@ -39,6 +41,7 @@ import javax.swing.JMenuItem;
 import javax.swing.JOptionPane;
 import javax.swing.JPanel;
 import javax.swing.JPopupMenu;
+import javax.swing.JScrollPane;
 import javax.swing.JSeparator;
 import javax.swing.JViewport;
 import javax.swing.SwingUtilities;
@@ -67,7 +70,7 @@ public class Diagram extends JPanel implements MouseListener, MouseMotionListene
 
         addMouseListener(this);
         addMouseMotionListener(this);
-        createPopupMenu();        
+        createPopupMenu();
     }
 
     @Override
@@ -77,64 +80,79 @@ public class Diagram extends JPanel implements MouseListener, MouseMotionListene
     @Override
     public void mousePressed(MouseEvent e) {
 
-        for (OutBusPanel outBusPanel : outBuses) {
-            Point p = SwingUtilities.convertPoint(this, e.getX(), e.getY(), outBusPanel);
-            if (outBusPanel.contains(p)) {
-                MouseEvent me = SwingUtilities.convertMouseEvent(this, e, outBusPanel);
-                outBusPanel.dispatchEvent(me);
+        if (e.getButton() == MouseEvent.BUTTON1) {
+            for (OutBusPanel outBusPanel : outBuses) {
+                Point p = SwingUtilities.convertPoint(this, e.getX(), e.getY(), outBusPanel);
+                if (outBusPanel.contains(p)) {
+                    MouseEvent me = SwingUtilities.convertMouseEvent(this, e, outBusPanel);
+                    outBusPanel.dispatchEvent(me);
+                    if (me.isConsumed()) {
+                        return;
+                    }
+                }
+            }
+
+            for (Connection connection : connections) {
+                MouseEvent me = SwingUtilities.convertMouseEvent(this, e, connection);
+                connection.select(me);
                 if (me.isConsumed()) {
                     return;
                 }
             }
-        }
 
-        for (Connection connection : connections) {
-            MouseEvent me = SwingUtilities.convertMouseEvent(this, e, connection);
-            connection.select(me);
-            if (me.isConsumed()) {
-                return;
-            }
+            selectedItem = null;
+            repaint();
+        } else if (e.getButton() == MouseEvent.BUTTON2) {
+            setCursor(hndCursor);
+            pp.setLocation(e.getPoint());
+            ((JScrollPane)getParent().getParent()).setWheelScrollingEnabled(false);
         }
-
-        selectedItem = null;
-        repaint();
     }
 
     public void refreshPreviews(Material mat) {
         for (OutBusPanel outBusPanel : outBuses) {
-            outBusPanel.updatePreview(mat);            
+            outBusPanel.updatePreview(mat);
         }
-        if(backDrop.isVisible()){
+        if (backDrop.isVisible()) {
             backDrop.showMaterial(mat);
         }
     }
-    
-    public void displayBackdrop(){
-        if(backDrop.getParent()== null){
+
+    public void displayBackdrop() {
+        if (backDrop.getParent() == null) {
             add(backDrop);
-            ((JViewport)getParent()).addChangeListener(backDrop);
+            ((JViewport) getParent()).addChangeListener(backDrop);
         }
-        
+
         backDrop.setVisible(true);
-        backDrop.update(((JViewport)getParent()));
+        backDrop.update(((JViewport) getParent()));
     }
-    
+
     Point clickLoc = new Point(0, 0);
 
     @Override
     public void mouseReleased(MouseEvent e) {
-        if (draggedFrom != null && draggedFrom.getNode() instanceof OutBusPanel) {
-            MouseEvent me = SwingUtilities.convertMouseEvent(this, e, draggedFrom.getNode());
-            draggedFrom.getNode().dispatchEvent(me);
-            if (me.isConsumed()) {
-                return;
-            }
-        }
-        if (e.getButton() != MouseEvent.BUTTON3) {
-            dispatchToOutBuses(e);
-        } else {
-            contextMenu.show(this, e.getX(), e.getY());
-            clickLoc.setLocation(e.getX(), e.getY());
+
+        switch (e.getButton()) {
+            case MouseEvent.BUTTON1:
+                if (draggedFrom != null && draggedFrom.getNode() instanceof OutBusPanel) {
+                    MouseEvent me = SwingUtilities.convertMouseEvent(this, e, draggedFrom.getNode());
+                    draggedFrom.getNode().dispatchEvent(me);
+                    if (me.isConsumed()) {
+                        return;
+                    }
+                }
+
+                dispatchToOutBuses(e);
+                break;
+            case MouseEvent.BUTTON2:
+                setCursor(defCursor);
+                 ((JScrollPane)getParent().getParent()).setWheelScrollingEnabled(true);
+                break;
+            case MouseEvent.BUTTON3:
+                contextMenu.show(this, e.getX(), e.getY());
+                clickLoc.setLocation(e.getX(), e.getY());
+                break;
         }
 
     }
@@ -151,11 +169,11 @@ public class Diagram extends JPanel implements MouseListener, MouseMotionListene
         }
         repaint();
     }
-    
-    protected void showEdit(NodePanel node) {                
-        parent.showShaderEditor(node.getName(),node.getType(),node.filePaths);        
+
+    protected void showEdit(NodePanel node) {
+        parent.showShaderEditor(node.getName(), node.getType(), node.filePaths);
     }
-    
+
     public void notifyMappingCreation(Connection conn) {
         parent.makeMapping(conn);
     }
@@ -284,14 +302,28 @@ public class Diagram extends JPanel implements MouseListener, MouseMotionListene
         }
     }
 
+    private final Cursor defCursor = Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR);
+    private final Cursor hndCursor = Cursor.getPredefinedCursor(Cursor.MOVE_CURSOR);
+    private final Point pp = new Point();
+
     @Override
     public void mouseDragged(MouseEvent e) {
-        if (draggedFrom == null) {
-            if (selectedItem instanceof OutBusPanel) {
-                OutBusPanel bus = (OutBusPanel) selectedItem;
-                MouseEvent me = SwingUtilities.convertMouseEvent(this, e, bus);
-                bus.dispatchEvent(me);
+        if (SwingUtilities.isLeftMouseButton(e)) {
+            if (draggedFrom == null) {
+                if (selectedItem instanceof OutBusPanel) {
+                    OutBusPanel bus = (OutBusPanel) selectedItem;
+                    MouseEvent me = SwingUtilities.convertMouseEvent(this, e, bus);
+                    bus.dispatchEvent(me);
+                }
             }
+        } else if (SwingUtilities.isMiddleMouseButton(e)) {
+            JViewport vport = (JViewport) getParent();
+            Point cp = e.getPoint();
+            Point vp = vport.getViewPosition();
+            vp.translate(pp.x - cp.x, pp.y - cp.y);
+            scrollRectToVisible(new Rectangle(vp, vport.getSize()));
+            //pp.setLocation(cp);
+
         }
     }
 
@@ -313,7 +345,6 @@ public class Diagram extends JPanel implements MouseListener, MouseMotionListene
         start.connect(conn);
         end.connect(conn);
 
-
         addConnection(conn);
 
         return conn;
@@ -401,14 +432,13 @@ public class Diagram extends JPanel implements MouseListener, MouseMotionListene
         return item;
     }
 
-    
-    public void clear(){
+    public void clear() {
         removeAll();
         outBuses.clear();
         connections.clear();
         nodes.clear();
     }
-    
+
     private void createPopupMenu() {
         contextMenu.setFont(new Font("Tahoma", 1, 10)); // NOI18N
         contextMenu.setOpaque(true);
@@ -421,7 +451,6 @@ public class Diagram extends JPanel implements MouseListener, MouseMotionListene
         contextMenu.setBorder(BorderFactory.createCompoundBorder(contextMenu.getBorder(),
                 labelBorder));
 
-
         JMenuItem nodeItem = createMenuItem("Node", Icons.node);
         nodeItem.addActionListener(new ActionListener() {
             @Override

jme3-materialeditor/src/com/jme3/gde/materialdefinition/editor/DraggablePanel.java

@@ -8,6 +8,7 @@ import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
 import java.awt.event.MouseMotionListener;
 import javax.swing.JPanel;
+import javax.swing.SwingUtilities;
 
 /**
  *
@@ -18,8 +19,7 @@ public class DraggablePanel extends JPanel implements MouseListener, MouseMotion
     protected int svdx, svdy, svdex, svdey;
     private boolean vertical = false;
     protected Diagram diagram;
-   
-    
+
     public DraggablePanel(boolean vertical) {
         this();
         this.vertical = vertical;
@@ -36,15 +36,17 @@ public class DraggablePanel extends JPanel implements MouseListener, MouseMotion
 
     @Override
     public void mousePressed(MouseEvent e) {
-        svdx = getLocation().x;
-        if (!vertical) {
-            svdex = e.getXOnScreen();
+        if (e.getButton() != MouseEvent.BUTTON2) {
+            svdx = getLocation().x;
+            if (!vertical) {
+                svdex = e.getXOnScreen();
+            }
+            svdy = getLocation().y;
+            svdey = e.getYOnScreen();
+            e.consume();
         }
-        svdy = getLocation().y;
-        svdey = e.getYOnScreen();
-        e.consume();
     }
-    
+
     @Override
     public void mouseReleased(MouseEvent e) {
     }
@@ -63,13 +65,15 @@ public class DraggablePanel extends JPanel implements MouseListener, MouseMotion
 
     @Override
     public void mouseDragged(MouseEvent e) {
-        int xoffset = 0;
-        if (!vertical) {
-            xoffset = e.getLocationOnScreen().x - svdex;
+        if (!SwingUtilities.isMiddleMouseButton(e)) {
+            int xoffset = 0;
+            if (!vertical) {
+                xoffset = e.getLocationOnScreen().x - svdex;
+            }
+            int yoffset = e.getLocationOnScreen().y - svdey;
+            setLocation(Math.max(0, svdx + xoffset), Math.max(0, svdy + yoffset));
+            e.consume();
         }
-        int yoffset = e.getLocationOnScreen().y - svdey;
-        setLocation(Math.max(0, svdx + xoffset), Math.max(0,svdy + yoffset));
-        e.consume();
     }
 
     public Diagram getDiagram() {