From 7faa6c2fcfc8272e2827c904ee2dabe68fa9f772 Mon Sep 17 00:00:00 2001
From: Etienne Rebetez <etienne.rebetez@oberwallis.ch>
Date: Wed, 14 Jul 2010 22:10:00 +0000
Subject: [PATCH] adding previousOf, nextOf, first and lastElementfunction to
 pseTable class.

svn path=/trunk/KDE/kdeedu/libkdeedu/; revision=1150039
---
 libscience/psetables.cpp | 22 ++++++++++++++++++++++
 libscience/psetables.h   | 28 ++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/libscience/psetables.cpp b/libscience/psetables.cpp
index 580a5d9..c3c3a96 100644
--- a/libscience/psetables.cpp
+++ b/libscience/psetables.cpp
@@ -103,6 +103,28 @@ QList<int> pseTable::elements() const
     return m_elementList;
 }
 
+int pseTable::previousOf( int element ) const
+{
+    int index = m_elementList.indexOf( element );
+    return index > 1 ? m_elementList.at( index - 1 ) : -1;
+}
+
+int pseTable::nextOf( int element ) const
+{
+    int index = m_elementList.indexOf( element );
+    return index != -1 && ( index < m_elementList.count() - 1 ) ? m_elementList.at( index + 1 ) : -1;
+}
+
+int pseTable::firstElement() const
+{
+    return m_elementList.first();
+}
+
+int pseTable::lastElement() const
+{
+    return m_elementList.last();
+}
+
 QPoint pseTable::elementCoords(const int element)
 {
     int elementIndex = m_elementList.indexOf( element );
diff --git a/libscience/psetables.h b/libscience/psetables.h
index 7e49575..fdd2148 100644
--- a/libscience/psetables.h
+++ b/libscience/psetables.h
@@ -92,6 +92,34 @@ public:
      */
     virtual QPoint elementCoords(int element);
 
+    /**
+     * Returns the element that comes right before the specified @p element.
+     * -1 means that @p element is the first in this table type.
+     *
+     * The default implementation returns <tt>element - 1</tt> if @p element
+     * is not 1, else -1.
+     */
+    int previousOf ( int element ) const;
+
+    /**
+     * Returns the element that comes right after the specified @p element.
+     * -1 means that @p element is the last in this table type.
+     *
+     * The default implementation returns <tt>element + 1</tt> if @p element
+     * is not the latest element, else -1.
+     */
+    int nextOf ( int element ) const;
+
+    /**
+     * Returns the first element of the table.
+     */
+    int firstElement() const;
+
+    /**
+     * Returns the last element of the table.
+     */
+    int lastElement() const;
+
     /**
      * Returns a list with all elements in the actual periodic table
      */
-- 
2.47.3