From f5c3009d23291f17be708ddcd38b5e9b1eb2fd7d Mon Sep 17 00:00:00 2001
From: Ricardo Markiewicz <rmarkie@fi.uba.ar>
Date: Tue, 1 Nov 2005 05:36:28 +0000
Subject: [PATCH 1/1] Agrego posibilidad de ir al nodo anterior.

---
 viewer/view_btree.cpp | 19 ++++++++++++++++++-
 viewer/view_btree.h   |  4 ++++
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/viewer/view_btree.cpp b/viewer/view_btree.cpp
index 6a1fd16..eb2e067 100644
--- a/viewer/view_btree.cpp
+++ b/viewer/view_btree.cpp
@@ -16,10 +16,27 @@ ViewBTree::ViewBTree (Canvas::Group *parent, std::string filename, uint block_si
 	byte_to_pixels  = node_width/block_size;
 
 	last_selected = NULL;
+	last_visited = 0;
+}
+
+void ViewBTree::GoBack ()
+{
+	uint l = back.top ();
+	back.pop ();
+
+	Clear ();
+	AddNode (l, 1);
 }
 
 void ViewBTree::AddNode (uint num, uint padre)
 {
+	/* Hack de ultima hora :P */
+	if (padre == 0)
+		/* evito quedar en circulo :D */
+		back.push (last_visited);
+
+	last_visited = num;
+
 	uchar *node = ReadBlock (num);
 
 	BTreeNodeHeader node_h;
@@ -45,7 +62,7 @@ void ViewBTree::on_item_activated (BTreeData *data, uint num, ViewNode *vnode)
 	delete vnode;
 
 	std::cout << next << std::endl;
-	AddNode (next, num);
+	AddNode (next, 0);
 }
 
 void ViewBTree::on_item_selected (BTreeData *data, uint num, ViewNode *vnode)
diff --git a/viewer/view_btree.h b/viewer/view_btree.h
index 894bf5d..18f4df7 100644
--- a/viewer/view_btree.h
+++ b/viewer/view_btree.h
@@ -4,6 +4,7 @@
 
 #include <libgnomecanvasmm.h>
 #include <string>
+#include <stack>
 
 #include "btree.h"
 #include "view_node.h"
@@ -18,6 +19,7 @@ class ViewBTree : public Canvas::Group, public BTree {
 
 		void Clear ();
 		void HighliteKey (Clave &k);
+		void GoBack ();
 
 		static double byte_to_pixels;
 		static double node_width;
@@ -33,6 +35,8 @@ class ViewBTree : public Canvas::Group, public BTree {
 		/* Control para no poner 2 veces un nodo */
 		/* Un nodo que quiera ser puesto 2 veces es un bug :) */
 		std::map<uint,bool> node_placed;
+		std::stack<uint> back;
+		uint last_visited;
 
 	public:
 		void AddNode (uint num, uint padre = 0);
-- 
2.43.0