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+/****************************************************************************
+ * NxWidgets/libnxwidgets/include/cstickybuttonarray.cxx
+ *
+ *   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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+ 
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <nuttx/nx/nxglib.h>
+
+#include "cstickybuttonarray.hxx"
+#include "cgraphicsport.hxx"
+#include "cwidgetstyle.hxx"
+
+/****************************************************************************
+ * Pre-Processor Definitions
+ ****************************************************************************/
+ 
+/****************************************************************************
+ * CStickyButtonArray Method Implementations
+ ****************************************************************************/
+
+using namespace NXWidgets;
+
+/**
+ * Constructor for an array of sticky buttons.
+ *
+ * @param pWidgetControl The widget control for the display.
+ * @param x The x coordinate of the button array, relative to its parent.
+ * @param y The y coordinate of the button array, relative to its parent.
+ * @param buttonColumns The number of buttons in one row of the button array
+ * @param buttonRows The number of buttons in one column of the button array
+ * @param buttonWidth The width of one button
+ * @param buttonHeight The height of one button
+ * @param style The style that the button should use.  If this is not
+ *        specified, the button will use the global default widget
+ *        style.
+ */
+
+CStickyButtonArray::CStickyButtonArray(CWidgetControl *pWidgetControl,
+                                       nxgl_coord_t x, nxgl_coord_t y,
+                                       uint8_t buttonColumns, uint8_t buttonRows,
+                                       nxgl_coord_t buttonWidth, nxgl_coord_t buttonHeight,
+                                       CWidgetStyle *style)
+: CButtonArray(pWidgetControl, x, y, buttonColumns, buttonRows, buttonWidth, buttonHeight, style)
+{
+  // Initialize state
+
+  m_isStuckDown = false;
+  m_stickDown   = false;
+}
+
+/**
+ * Check if any button in the array is stuck down and, if so,
+ * return the indices of the stuck down button.
+ *
+ * @param column The location to return the column index of the button
+ *    of interest
+ * @param row The location to return the row index of the button of
+ *    interest
+ * @return True if a button in the array is clicked
+ */
+
+bool CStickyButtonArray::isAnyButtonStuckDown(int &column, int &row) const
+{
+  // Return the indices of the last stuck button
+
+  column = m_stickyColumn;
+  row    = m_stickyRow;
+
+  // Return true if the button is currently stuck
+
+  return m_isStuckDown;
+}
+
+/**
+ * Check if this specific button in the array is stuck down
+ *
+ * @param column The column of the button to check.
+ * @param row The row of the button to check.
+ * @return True if this button is stuck down
+ */
+
+bool CStickyButtonArray::isThisButtonStuckDown(int column, int row) const
+{
+  // Does this match the index of the last stuck button?
+
+  if (column == m_stickyColumn && row == m_stickyRow)
+    {
+      // Yes.. return true if it is still stuck
+
+      return m_isStuckDown;
+    }
+  else
+    {
+       // This button is definitely not stuck down
+
+       return false;
+     }
+}
+
+/**
+ * Force the button at this position into the stuck down state
+ *
+ * @param column The column containing the button to stick down
+ * @param row The rowtcontaining the button to stick down
+ * @return False(0) is returned if the indices are out of range.
+ */
+
+bool CStickyButtonArray::stickDown(int column, int row)
+{
+  // Verify that the cursor position is within range
+
+  if ((unsigned)column < m_buttonColumns && (unsigned)row < m_buttonRows)
+    {
+      // First, unstick any currently stuck buttons
+
+      unstick();
+
+      // Then stick this button down
+
+      m_stickyColumn = column;
+      m_stickyRow    = row;
+      m_isStuckDown  = true;
+
+      // We only want to update the stuck down buttons
+
+      m_stickDown    = true;
+      redraw();
+      m_stickDown    = false;
+      return true;
+    }
+
+  return false;
+}
+
+/**
+ * Unstick all buttons.
+ */
+
+void CStickyButtonArray::unstick(void)
+{
+  // Is any button stuck down?
+
+  if (m_isStuckDown)
+    {
+      // Yes.. unstick it and update the button display
+
+      m_isStuckDown = false;
+
+      // We only want to update the stuck down buttons
+
+      m_stickDown   = true;
+      redraw();
+      m_stickDown   = false;
+   }
+}
+
+/**
+ * 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 CStickyButtonArray::drawContents(CGraphicsPort *port)
+{
+  // Are we just updating the stuck down button?
+
+  if (m_stickDown)
+    {
+      // There are two cases:  (1) A sticky button was unstuck, or (2) a new
+      // button is stuck down.  m_isStuckDown will distinguish these
+      //
+      // Draw the button using the clicked style if either (1) it is
+      // stuck down OR (2) it is currently clicked.  Draw the button in
+      // the normal style if is is un-stuck and not clicked.
+      //
+      // NOTE: If usedClicked is false, the button may revert to either
+      // (1) the "normal" button state, or (2) the "highlighted" button
+      // stated.  drawButton() will handle that.
+
+      bool useClicked = m_isStuckDown || isThisButtonClicked(m_stickyColumn, m_stickyRow);
+      drawButton(port, m_stickyColumn, m_stickyRow, useClicked);
+    }
+
+  // Do we draw just one button (due to click or release)? 
+
+  else if (m_redrawButton)
+    {
+      // Just one.  Get the row/column indices from the last click
+
+      int column;
+      int row;
+      bool useClicked = isButtonClicked(column, row);
+
+      // If this is a press or release on the stuck down button, then don't
+      // redraw the button.  Drawing of stuck down and unstuck buttons is
+      // controlled entirely by the m_stickDown case.
+
+      if (!isThisButtonStuckDown(column, row))
+        {
+          // Not a stuck down button. Re-draw that button
+
+          drawButton(port, column, row, useClicked);
+        }
+    }
+
+  // Do we just draw the hightlighted button?
+
+  else if (m_cursorChange)
+    {
+      // Do nothing if the highlighted button is also the stuck down button
+      // or the clicked button
+
+      if (!isThisButtonStuckDown(m_cursorColumn, m_cursorRow) &&
+          !isThisButtonClicked(m_cursorColumn, m_cursorRow))
+        {
+          drawButton(port, m_cursorColumn, m_cursorRow, false);
+        }
+    }
+
+  // Draw all buttons
+
+  else
+    {
+      // Visit each column
+
+      for (int column = 0; column < m_buttonColumns; column++)
+        {
+          // Visit each row
+
+          for (int row = 0; row < m_buttonRows; row++)
+            {
+              // Is the button clicked?
+
+              bool useClicked = isThisButtonClicked(column, row);
+
+              // If the button is not clicked but it is the stuck button,
+              // then draw it as clicked anyway.
+
+              if (!useClicked)
+                {
+                  useClicked =  isThisButtonStuckDown(column, row);
+                }
+
+               // Draw each button.  If useClicked is false, then drawButton
+               // will do the right thing if the button is highlighted.
+
+               drawButton(port, column, row, useClicked);
+            }
+        }
+    }
+}
+