Merged gcj-eclipse branch to trunk.

From-SVN: r120621

libjava/classpath/java/awt/ScrollPane.java

@@ -338,10 +338,15 @@ getVScrollbarWidth()
   * Returns the current scroll position of the viewport.
   *
   * @return The current scroll position of the viewport.
+  * 
+  * @throws NullPointerException if the scrollpane does have a child.
   */
 public Point
 getScrollPosition()
 {
+  if (getComponentCount() == 0)
+    throw new NullPointerException();
+  
   int x = 0;
   int y = 0;
 
@@ -380,20 +385,35 @@ setScrollPosition(Point scrollPosition) throws IllegalArgumentException
   * @param x The new X coordinate of the scroll position.
   * @param y The new Y coordinate of the scroll position.
   *
+  * @throws NullPointerException if scrollpane does not have a child.
+  * 
   * @exception IllegalArgumentException If the specified value is outside
   * the legal scrolling range.
   */
 public void
 setScrollPosition(int x, int y)
 {
+  if (getComponentCount() == 0)
+    throw new NullPointerException("child is null");
+
+  if (x > (int) (getComponent(0).getWidth() - getViewportSize().getWidth()))
+    x = (int) (getComponent(0).getWidth() - getViewportSize().getWidth());
+  if (y > (int) (getComponent(0).getHeight() - getViewportSize().getHeight()))
+    y = (int) (getComponent(0).getHeight() - getViewportSize().getHeight());
+
+  if (x < 0)
+    x = 0;
+  if (y < 0)
+    y = 0;
+    
   Adjustable h = getHAdjustable();
   Adjustable v = getVAdjustable();
-
+  
   if (h != null)
     h.setValue(x);
   if (v != null)
     v.setValue(y);
-
+   
   ScrollPanePeer spp = (ScrollPanePeer)getPeer();
   if (spp != null)
     spp.setScrollPosition(x, y);
@@ -414,7 +434,7 @@ addNotify()
   super.addNotify();
 
   Component[] list = getComponents();
-  if (list != null && list.length > 0 && ! (list[0] instanceof Panel))
+  if (list != null && list.length > 0 && list[0].isLightweight())
   {
     Panel panel = new Panel();
     panel.setLayout(new BorderLayout());
@@ -453,9 +473,7 @@ removeNotify()
   if ((list != null) && (list.length > 0))
     remove(list[0]);
 
-  super.addImpl(component, constraints, -1);
-
-  doLayout();
+  super.addImpl(component, constraints, index);
 }
 
 /*************************************************************************/
@@ -507,6 +525,8 @@ layout()
         p.y = dim.height;
 
       setScrollPosition (p);
+      
+      list[0].setLocation(new Point());
     }
 }
 
@@ -518,11 +538,12 @@ layout()
   * not have layout managers.
   *
   * @param layoutManager Ignored
+  * @throws AWTError Always throws this error when called. 
   */
 public final void
 setLayout(LayoutManager layoutManager)
 {
-  return;
+  throw new AWTError("ScrollPane controls layout");
 }
 
 /*************************************************************************/
@@ -553,16 +574,37 @@ paramString()
          + getX() + ","
          + getY() + ","
          + getWidth() + "x" + getHeight() + ","
-         + "ScrollPosition=(" + scrollPosition.getX() + "," 
-                              + scrollPosition.getY() + "),"
+         + getIsValidString() + ","
+         + "ScrollPosition=(" + scrollPosition.x + "," 
+                              + scrollPosition.y + "),"
          + "Insets=(" + insets.top + ","
                       + insets.left + ","
                       + insets.bottom + ","
                       + insets.right + "),"
-         + "ScrollbarDisplayPolicy=" + getScrollbarDisplayPolicy() + ","
+         + "ScrollbarDisplayPolicy=" + getScrollbarDisplayPolicyString() + ","
          + "wheelScrollingEnabled=" + isWheelScrollingEnabled();
 }
 
+private String
+getScrollbarDisplayPolicyString()
+{
+  if (getScrollbarDisplayPolicy() == 0)
+    return "as-needed";
+  else if (getScrollbarDisplayPolicy() == 1)
+    return "always";
+  else
+    return "never";
+}
+
+private String 
+getIsValidString()
+{
+  if (isValid())
+    return "valid";
+  else
+    return "invalid";
+}
+
   /**
    * Tells whether or not an event is enabled.
    *