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+/***************************************************************************
+ *
+ * Copyright (C) 2005 Elad Lahav (elad_lahav@users.sourceforge.net)
+ *
+ * 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.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 HISTORYVIEW_H
+#define HISTORYVIEW_H
+
+#include "queryview.h"
+
+/**
+ * A list view item for holding position history records.
+ * A QListViewItem cannot reference its preceding item, which is required to
+ * create a stack-like history list. Therefore a HistoryItem object
+ * stores a pointer to the item just above it in the list. The pointer is
+ * persistent, since the list cannot be sorted.
+ * @author Elad Lahav
+ */
+
+class HistoryItem : public QListViewItem
+{
+public:
+	/**
+	 * Class constructor.
+	 * @param	pList	The parent list view
+	 * @param	sFile	The file path in this record
+	 * @param	sLine	The line number
+	 * @param	sText	The contents of the line in the given file
+	 */
+	HistoryItem(QListView* pList, QString sFile, QString sLine, 
+		QString sText) : 
+		QListViewItem(pList, "", sFile, sLine, sText),
+		m_pPrevSibling(NULL) {
+		HistoryItem* pNext;
+		
+		// Mark the new item as the predecessor of its next sibling 
+		if ((pNext = (HistoryItem*)nextSibling()) != NULL)
+			pNext->m_pPrevSibling = this;
+	}
+	
+	/** The item immediately above this one in the list. */
+	HistoryItem* m_pPrevSibling;
+};
+
+/**
+ * A list view widget for holding position history.
+ * Position history is kept in a stack-like list. Positions are always added
+ * to the top of the list, immediately before the current item. If the
+ * current item is not the top one, all items above it are purged first.
+ * To keep the stack-like structure, the list cannot be sorted.
+ * @author Elad Lahav
+ */
+class HistoryView : public QueryView
+{
+Q_OBJECT
+public:
+	HistoryView(QWidget* pParent = 0, const char* szName = 0);
+	~HistoryView();
+	
+	virtual void addRecord(const QString&, const QString&, const QString&,
+		const QString&, QListViewItem*);
+	virtual void selectNext();
+	virtual void selectPrev();
+
+protected slots:
+	virtual void slotRemoveItem(QListViewItem*);
+};
+
+#endif