Behold, Nenya, Ring of Water and repository for our media and animation related

goodies, both Java 2D and LWJGL/JME 3D.


git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@1 ed5b42cb-e716-0410-a449-f6a68f950b19

src/java/com/threerings/media/SafeScrollPane.java

@@ -0,0 +1,89 @@
+//
+// $Id: SafeScrollPane.java 4191 2006-06-13 22:42:20Z ray $
+//
+// Narya library - tools for developing networked games
+// Copyright (C) 2002-2004 Three Rings Design, Inc., All Rights Reserved
+// http://www.threerings.net/code/narya/
+//
+// This library is free software; you can redistribute it and/or modify it
+// under the terms of the GNU Lesser General Public License as published
+// by the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+package com.threerings.media;
+
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.Point;
+
+import javax.swing.JComponent;
+import javax.swing.JScrollPane;
+import javax.swing.JViewport;
+
+/**
+ * A scroll pane that is safe to use in frame managed views.
+ */
+public class SafeScrollPane extends JScrollPane
+{
+    public SafeScrollPane ()
+    {
+    }
+
+    public SafeScrollPane (Component view)
+    {
+        super(view);
+    }
+
+    public SafeScrollPane (Component view, int owidth, int oheight)
+    {
+        super(view);
+        if (owidth != 0 || oheight != 0) {
+            _override = new Dimension(owidth, oheight);
+        }
+    }
+
+    // documentation inherited
+    public Dimension getPreferredSize ()
+    {
+        Dimension d = super.getPreferredSize();
+        if (_override != null) {
+            if (_override.width != 0) {
+                d.width = _override.width;
+            }
+            if (_override.height != 0) {
+                d.height = _override.height;
+            }
+        }
+        return d;
+    }
+
+    protected JViewport createViewport ()
+    {
+        JViewport vp = new JViewport() {
+            public void setViewPosition (Point p) {
+                super.setViewPosition(p);
+                // simple scroll mode results in setViewPosition causing
+                // our view to become invalid, but nothing ever happens to
+                // queue up a revalidate for said view, so we have to do
+                // it here
+                Component c = getView();
+                if (c instanceof JComponent) {
+                    ((JComponent)c).revalidate();
+                }
+            }
+        };
+        vp.setScrollMode(JViewport.SIMPLE_SCROLL_MODE);
+        return vp;
+    }
+
+    protected Dimension _override;
+}