Add NxWdigets::CGlyphSliderHorizontal and associated grip widgets. From Ken Pettit.

2 files changed, 707 insertions, 0 deletions

diff --git a/NxWidgets/libnxwidgets/src/cglyphsliderhorizontal.cxx b/NxWidgets/libnxwidgets/src/cglyphsliderhorizontal.cxx
new file mode 100644
index 000000000..97d8d01ad
--- /dev/null
+++ b/NxWidgets/libnxwidgets/src/cglyphsliderhorizontal.cxx
@@ -0,0 +1,503 @@
+
+/****************************************************************************
+ * NxWidgets/libnxwidgets/src/cglyphsliderhorizontal.cxx
+ *
+ *   Copyright (C) 2013 Ken Pettit. All rights reserved.
+ *   Author: Ken Pettit <pettitkd@gmail.com>
+ *
+ *   Based on and copied from csliderhorizontal.cxx written by Gregory Nutt
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include "cwidgetcontrol.hxx"
+#include "cglyphsliderhorizontal.hxx"
+#include "cglyphsliderhorizontalgrip.hxx"
+#include "cimage.hxx"
+#include "cgraphicsport.hxx"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Method Implementations
+ ****************************************************************************/
+
+using namespace NXWidgets;
+
+/**
+ * Constructor.
+ *
+ * @param pWidgetControl The controlling widget for the display
+ * @param x The x coordinate of the slider, relative to its parent.
+ * @param y The y coordinate of the slider, relative to its parent.
+ * @param width The width of the slider.
+ * @param height The height of the slider.
+ */
+
+CGlyphSliderHorizontal::CGlyphSliderHorizontal(CWidgetControl * pWidgetControl, 
+        nxgl_coord_t x, nxgl_coord_t y, 
+        nxgl_coord_t width, nxgl_coord_t height, 
+        IBitmap * pGripBitmap, 
+        nxwidget_pixel_t fillColor, bool fill)
+:CNxWidget(pWidgetControl, x, y, width, height, WIDGET_DRAGGABLE)
+{
+  m_minimumValue = 0;
+  m_maximumValue = 0;
+  m_contentSize = 0;
+  m_value = 0;
+  m_minimumGripWidth = 10;
+  m_pageSize = 1;
+  m_fillColor = fillColor;
+  m_fill = fill;
+  m_barThickness = 8;
+
+  m_flags.permeable = false;
+  m_flags.borderless = false;
+  m_flags.doubleClickable = false;
+
+  // Create grip
+
+  CRect rect;
+  getClientRect(rect);
+  m_gutterWidth = rect.getWidth();
+
+  // Create grip
+
+  m_grip = new CGlyphSliderHorizontalGrip(pWidgetControl, x, y,
+                                          width, height, pGripBitmap);
+  m_grip->setBorderless(true);
+  m_grip->addWidgetEventHandler(this);
+  addWidget(m_grip);
+}
+
+/**
+ * Set the value that of the slider.  This will reposition
+ * and redraw the grip.
+ *
+ * @param value The new value.
+ */
+
+void CGlyphSliderHorizontal::setValue(const nxgl_coord_t value)
+{
+  setValueWithBitshift((int32_t) value << 16);
+}
+
+/**
+ * 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.
+ */
+
+void CGlyphSliderHorizontal::setValueWithBitshift(const int32_t value)
+{
+  CRect rect;
+  getClientRect(rect);
+
+  // Can the grip move?
+
+  if ((rect.getWidth() > m_grip->getWidth()) &&
+      (m_maximumValue != m_minimumValue))
+    {
+      int32_t newValue = value;
+      int32_t maxValue = getPhysicalMaximumValueWithBitshift();
+
+      // Limit to max/min values
+
+      if (newValue > maxValue)
+        {
+          newValue = maxValue;
+        }
+
+      if (newValue >> 16 < m_minimumValue)
+        {
+          newValue = m_minimumValue << 16;
+        }
+
+      uint32_t scrollRatio = newValue / m_contentSize;
+      int32_t newGripX = m_gutterWidth * scrollRatio;
+      newGripX += newGripX & 0x8000;
+      newGripX >>= 16;
+      newGripX += rect.getX();
+
+      m_grip->moveTo(newGripX, (rect.getHeight() - m_grip->getHeight()) >> 1);
+
+      // Update stored value if necessary
+
+      if (m_value != newValue)
+        {
+          m_value = newValue;
+          m_widgetEventHandlers->raiseValueChangeEvent();
+        }
+    }
+}
+
+/**
+ * Process events fired by the grip.
+ *
+ * @param e The event details.
+ */
+
+void CGlyphSliderHorizontal::handleDragEvent(const CWidgetEventArgs & e)
+{
+  // Handle grip events
+
+  if ((e.getSource() == m_grip) && (e.getSource() != NULL))
+    {
+      int32_t newValue = getGripValue() >> 16;
+
+      // Grip has moved - compare values and raise event if the
+      // value has changed.  Compare using integer values rather
+      // than fixed-point.
+
+      if (m_value >> 16 != newValue)
+        {
+          m_value = newValue << 16;
+          m_widgetEventHandlers->raiseValueChangeEvent();
+        }
+    }
+}
+
+/**
+ * Get the smallest value that the slider can move through when
+ * dragged.
+ *
+ * @return The smallest value that the slider can move through when
+ * dragged.
+ */
+
+nxgl_coord_t CGlyphSliderHorizontal::getMinimumStep(void) const
+{
+  // If the ratio of content to gutter is greater than or equal to one,
+  // the minimum step that the slider can represent will be that ratio.
+
+  uint32_t gutterRatio = m_contentSize << 16 / m_gutterWidth;
+  gutterRatio += gutterRatio & 0x8000;
+  gutterRatio >>= 16;
+
+  if (gutterRatio > 0)
+    {
+      return gutterRatio;
+    }
+
+  return 1;
+}
+
+/**
+ * Get the maximum possible value that the slider can represent.  Useful when
+ * using the slider as a scrollbar, as the height of the grip prevents the full
+ * range of values being accessed (intentionally).
+ * The returned value is bitshfted left 16 places for more accuracy in fixed-point
+ * calculations.
+ *
+ * @return The maximum possible value that the slider can represent.
+ */
+
+int32_t CGlyphSliderHorizontal::getPhysicalMaximumValueWithBitshift(void) const
+{
+  uint32_t maxX = m_gutterWidth - m_grip->getWidth();
+  uint32_t scrollRatio = (maxX << 16) / m_gutterWidth;
+  int32_t value = (scrollRatio * m_contentSize);
+
+  return value;
+}
+
+/**
+ * Get the value represented by the top of the grip.
+ * return The value represented by the top of the grip.
+ */
+
+const int32_t CGlyphSliderHorizontal::getGripValue(void) const
+{
+  // Calculate the current value represented by the top of the grip
+
+  CRect rect;
+  getClientRect(rect);
+
+  uint32_t gripPos = ((m_grip->getX() - getX()) - rect.getX());
+  uint32_t scrollRatio = (gripPos << 16) / m_gutterWidth;
+  int32_t value = (scrollRatio * m_contentSize);
+
+  return value;
+}
+
+/**
+ * Draw the area of this widget that falls within the clipping region.
+ * Called by the redraw() function to draw all visible regions.
+ *
+ * @param port The CGraphicsPort to draw to.
+ * @see redraw()
+ */
+
+void CGlyphSliderHorizontal::drawContents(CGraphicsPort * port)
+{
+  int halfGripWidth = m_grip->getWidth() >> 1;
+  int halfBar = m_barThickness >> 1;
+  int halfHeight = getHeight() >> 1;
+  int width;
+  nxwidget_pixel_t color;
+
+  // Fill in (erase) the region to the left and right of the fuel guage
+
+  width =
+    m_grip->getX() > halfGripWidth ? halfGripWidth : m_grip->getX() - getX();
+  port->drawFilledRect(getX(), getY(), width, getHeight(),
+                       getBackgroundColor());
+
+  // Fill in (erase) the region above the "fuel gauge"
+
+  port->drawFilledRect(getX(), getY(), getWidth(), halfHeight - halfBar,
+                       getBackgroundColor());
+
+  // Fill in the bar area to the left of the grip
+
+  if (m_fill)
+    color = m_fillColor;
+  else
+    color = getBackgroundColor();
+  if (m_grip->getX() > halfGripWidth)
+    port->drawFilledRect(getX() + 1 + halfGripWidth,
+                         getY() + halfHeight - halfBar + 1,
+                         m_grip->getX() - halfGripWidth, m_barThickness - 2,
+                         color);
+
+  // Fill in bar the area to the right of the grip
+
+  width = getWidth() - (m_grip->getX() - getX() + m_grip->getWidth()) - 1 -
+    halfGripWidth;
+  if (width > 0)
+    port->drawFilledRect(m_grip->getX() + m_grip->getWidth(),
+                         getY() + halfHeight - halfBar + 1, width,
+                         m_barThickness - 2, getBackgroundColor());
+
+  // Fill in (erase) the area to right of the bar
+
+  width = m_grip->getX() - getX() + m_grip->getWidth() <
+    getWidth() - halfGripWidth ? halfGripWidth : getWidth() - (m_grip->getX() -
+                                                               getX() +
+                                                               halfGripWidth);
+  if (width > 0)
+    port->drawFilledRect(getX() + getWidth() - halfGripWidth, getY(), width,
+                         getHeight(), getBackgroundColor());
+
+  // Fill in (erase) the region below the "fuel gauge"
+
+  port->drawFilledRect(getX(), getY() + halfHeight + (m_barThickness - halfBar),
+                       getWidth(), halfHeight - (m_barThickness - halfBar),
+                       getBackgroundColor());
+
+  // Now redraw the grip
+
+  m_grip->enableDrawing();
+  m_grip->redraw();
+}
+
+/**
+ * Draw the area of this widget that falls within the clipping region.
+ * Called by the redraw() function to draw all visible regions.
+ *
+ * @param port The CGraphicsPort to draw to.
+ * @see redraw()
+ */
+
+void CGlyphSliderHorizontal::drawBorder(CGraphicsPort * port)
+{
+  // Stop drawing if the widget indicates it should not have an outline
+
+  if (!isBorderless())
+    {
+      int y1, y2;
+      int x = getX();
+      int gripWidth = m_grip->getWidth();
+      int halfGripWidth = gripWidth >> 1;
+      int gripX = m_grip->getX();
+      int width;
+      nxwidget_pixel_t shine;
+      nxwidget_pixel_t shadow;
+
+      y1 = getY() + (getHeight() >> 1) - (m_barThickness >> 1);
+      y2 = getY() + (getHeight() >> 1) + m_barThickness - 
+          (m_barThickness >> 1) - 1;
+
+      // To the Left of the grip.  Only draw if the icon isn't covering the
+      // edge of the bar 
+
+      width = gripX - x - halfGripWidth;
+      if (width > 0)
+        {
+          // If we aren't filling, then don't draw a "raised" bar
+
+          if (m_fill)
+            {
+              shine = getShineEdgeColor();
+              shadow = getShadowEdgeColor();
+            }
+          else
+            {
+              shadow = getShineEdgeColor();
+              shine = getShadowEdgeColor();
+            }
+
+          port->drawHorizLine(x + halfGripWidth, y1, width, shine);
+          port->drawHorizLine(x + halfGripWidth, y2, width, shadow);
+        }
+
+      // To the Right of the grip
+      // Only draw if the icon isn't covering the edge of the bar 
+
+      width = getWidth() - (gripX - x + gripWidth) - 1 - halfGripWidth;
+      if (width > 0)
+        {
+
+          port->drawHorizLine(gripX + gripWidth, y1,
+                              getWidth() - (gripX - x + gripWidth) - 1 -
+                              halfGripWidth, getShadowEdgeColor());
+          port->drawHorizLine(gripX + gripWidth, y2,
+                              getWidth() - (gripX - x + gripWidth) - 1 -
+                              halfGripWidth, getShineEdgeColor());
+        }
+
+      // Left edge
+
+      if (gripX > x + halfGripWidth)
+        {
+          port->drawVertLine(x + halfGripWidth, y1, m_barThickness, 
+                getShineEdgeColor());
+        }
+
+      // Right edge
+
+      if (gripX + gripWidth < x + getWidth() - 1 - halfGripWidth)
+        {
+          port->drawVertLine(x + getWidth() - 1 - halfGripWidth, 
+                y1, m_barThickness, getShadowEdgeColor());
+        }
+    }
+}
+
+/**
+ * Resize the slider to the new dimensions.
+ *
+ * @param width The new width.
+ * @param height The new height.
+ */
+
+void CGlyphSliderHorizontal::onResize(nxgl_coord_t width, nxgl_coord_t height)
+{
+  // Remember current values
+
+  int32_t oldValue = m_value;
+  bool events = raisesEvents();
+
+  // Disable event raising
+
+  setRaisesEvents(false);
+  // resizeGrip();
+
+  // Set back to current value
+
+  setValue(oldValue);
+
+  // Reset event raising
+
+  setRaisesEvents(events);
+}
+
+/**
+ * Moves the grip towards the mouse.
+ *
+ * @param x The x coordinate of the click.
+ * @param y The y coordinate of the click.
+ */
+
+void CGlyphSliderHorizontal::onClick(nxgl_coord_t x, nxgl_coord_t y)
+{
+  // Which way should the grip move?
+
+  if (x > m_grip->getX())
+    {
+      // Move grip right
+
+      setValueWithBitshift(m_value + (m_pageSize << 16));
+    }
+  else
+    {
+      // Move grip left
+
+      setValueWithBitshift(m_value - (m_pageSize << 16));
+    }
+  redraw();
+}
diff --git a/NxWidgets/libnxwidgets/src/cglyphsliderhorizontalgrip.cxx b/NxWidgets/libnxwidgets/src/cglyphsliderhorizontalgrip.cxx
new file mode 100644
index 000000000..331ec8d8b
--- /dev/null
+++ b/NxWidgets/libnxwidgets/src/cglyphsliderhorizontalgrip.cxx
@@ -0,0 +1,204 @@
+/****************************************************************************
+ * NxWidgets/libnxwidgets/src/cglyphsliderhorizontalgrip.cxx
+ *
+ *   Copyright (C) 2013 Ken Pettit. All rights reserved.
+ *   Author: Ken Pettit <pettitkd@gmail.com>
+ *
+ *   Mostly copied from CSliderHorizontalGrip written by Gregory Nutt
+ *
+ * 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+ 
+#include "cglyphsliderhorizontalgrip.hxx"
+#include "ibitmap.hxx"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Method Implementations
+ ****************************************************************************/
+
+using namespace NXWidgets;
+
+/**
+ * Constructor.
+ *
+ * @param pWidgetControl The controlling widget for the display
+ * @param x The x coordinate of the grip, relative to its parent.
+ * @param y The y coordinate of the grip, relative to its parent.
+ * @param width The width of the grip.
+ * @param height The height of the grip.
+ */
+
+CGlyphSliderHorizontalGrip::CGlyphSliderHorizontalGrip(CWidgetControl *pWidgetControl,
+                                             nxgl_coord_t x, nxgl_coord_t y,
+                                             nxgl_coord_t width, nxgl_coord_t height,
+                                             IBitmap *pGripBitmap)
+: CImage(pWidgetControl, 0, (height>>1) - (pGripBitmap->getHeight() >> 1), 
+       pGripBitmap->getWidth(), pGripBitmap->getHeight(),
+       pGripBitmap, 0)
+{
+  // Make the widget draggable
+
+  setDraggable(true);
+}
+
+/**
+ * Resize the slider to the new dimensions.
+ *
+ * @param width The new width.
+ * @param height The new height.
+ */
+
+void CGlyphSliderHorizontalGrip::onResize(nxgl_coord_t width, nxgl_coord_t height)
+{
+}
+
+/**
+ * Starts dragging the grip and redraws it.
+ *
+ * @param x The x coordinate of the click.
+ * @param y The y coordinate of the click.
+ */
+
+void CGlyphSliderHorizontalGrip::onClick(nxgl_coord_t x, nxgl_coord_t y)
+{
+  startDragging(x, y);
+  redraw();
+}
+
+/**
+ * Redraws the grip.
+ *
+ * @param x The x coordinate of the mouse.
+ * @param y The y coordinate of the mouse.
+ */
+
+void CGlyphSliderHorizontalGrip::onRelease(nxgl_coord_t x, nxgl_coord_t y)
+{
+  redraw();
+}
+
+/**
+ * Redraws the grip.
+ *
+ * @param x The x coordinate of the mouse.
+ * @param y The y coordinate of the mouse.
+ */
+
+void CGlyphSliderHorizontalGrip::onReleaseOutside(nxgl_coord_t x, nxgl_coord_t y)
+{
+  redraw();
+}
+
+/**
+ * Moves the grip to follow the mouse.
+ *
+ * @param x The x coordinate of the mouse.
+ * @param y The y coordinate of the mouse.
+ * @param vX The horizontal distance of the drag.
+ * @param vY The vertical distance of the drag.
+ */
+
+void CGlyphSliderHorizontalGrip::onDrag(nxgl_coord_t x, nxgl_coord_t y,
+                                   nxgl_coord_t vX, nxgl_coord_t vY)
+{
+  // Work out where we're moving to
+
+  nxgl_coord_t destX = x - m_grabPointX - m_parent->getX();
+
+  // Do we need to move?
+
+  if (destX != m_rect.getX())
+    {
+      // Get parent rect
+
+      CRect rect;
+      m_parent->getClientRect(rect);
+
+      // Prevent grip from moving outside parent
+
+      if (destX < rect.getX())
+        {
+          destX = rect.getX();
+        }
+      else
+        {
+          if (destX + getWidth() > rect.getWidth() + rect.getX())
+            {
+              destX = (rect.getWidth() + rect.getX()) - getWidth() ;
+            }
+        }
+
+      // Move to new location
+
+      moveTo(destX, (rect.getHeight() - getHeight()) >> 1);
+      m_parent->redraw();
+    }
+}