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diff --git a/NxWidgets/libnxwidgets/include/islider.hxx b/NxWidgets/libnxwidgets/include/islider.hxx
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+/****************************************************************************
+ * NxWidgets/libnxwidgets/include/islider.hxx
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name NuttX, NxWidgets, nor the names of its contributors
+ *    me be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************
+ *
+ * Portions of this package derive from Woopsi (http://woopsi.org/) and
+ * portions are original efforts.  It is difficult to determine at this
+ * point what parts are original efforts and which parts derive from Woopsi.
+ * However, in any event, the work of  Antony Dzeryn will be acknowledged
+ * in most NxWidget files.  Thanks Antony!
+ *
+ *   Copyright (c) 2007-2011, Antony Dzeryn
+ *   All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * * Neither the names "Woopsi", "Simian Zombie" nor the
+ *   names of its contributors may be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Antony Dzeryn ``AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL Antony Dzeryn BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+#ifndef __INCLUDE_ISLIDER_HXX
+#define __INCLUDE_ISLIDER_HXX
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+ 
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <nuttx/nx/nxglib.h>
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+ 
+/****************************************************************************
+ * Abstract Base Classes
+ ****************************************************************************/
+ 
+#if defined(__cplusplus)
+
+namespace NXWidgets
+{
+  /**
+   * Defines the interface for slider widgets.
+   */
+  class ISlider
+  {
+  public:
+
+    /**
+     * Get the smallest value that the slider can represent.
+     *
+     * @return The smallest value.
+     */
+
+    virtual const nxgl_coord_t getMinimumValue(void) const = 0;
+
+    /**
+     * Get the largest value that the slider can represent.
+     *
+     * @return The largest value.
+     */
+
+    virtual const nxgl_coord_t getMaximumValue(void) const = 0;
+
+    /**
+     * Get the current value of the slider.
+     *
+     * return The current slider value.
+     */
+
+    virtual const nxgl_coord_t getValue(void) const = 0;
+
+    /**
+     * Get the value represented by the height of the grip.
+     * For sliders, this would typically be 1 (so each new
+     * grip position is worth 1).  For scrollbars, this
+     * would be the height of the scrolling widget.
+     *
+     * @return The page size.
+     */
+
+    virtual const nxgl_coord_t getPageSize(void) const = 0;
+
+    /**
+     * Set the smallest value that the slider can represent.
+     *
+     * @param value The smallest value.
+     */
+
+    virtual void setMinimumValue(const nxgl_coord_t value) = 0;
+
+    /**
+     * Set the largest value that the slider can represent.
+     *
+     * @param value The largest value.
+     */
+
+    virtual void setMaximumValue(const nxgl_coord_t value) = 0;
+
+    /**
+     * Set the value that of the slider.  This will reposition
+     * and redraw the grip.
+     *
+     * @param value The new value.
+     */
+
+    virtual void setValue(const nxgl_coord_t value) = 0;
+
+    /**
+     * Set the value that of the slider.  This will reposition and redraw
+     * the grip.  The supplied value should be bitshifted left 16 places.
+     * This ensures greater accuracy than the standard setValue() method if
+     * the slider is being used as a scrollbar.
+     *
+     * @param value The new value.
+     */
+
+    virtual void setValueWithBitshift(const int32_t value) = 0;
+
+    /**
+     * Set the page size represented by the grip.
+     *
+     * @param pageSize The page size.
+     * @see getPageSize().
+     */
+
+    virtual void setPageSize(const nxgl_coord_t pageSize) = 0;
+  };
+}
+
+#endif // __cplusplus
+
+#endif // __INCLUDE_ISLIDER_HXX
+