Agrego posibilidad de ir al nodo anterior.

[z.facultad/75.52/treemulator.git] / viewer / view_btree.cpp

diff --git a/viewer/view_btree.cpp b/viewer/view_btree.cpp
index 353fd2bb59361aea736bb178f1d12ee5400d2139..eb2e067249ff5bcdaa1fa6a8a7ea74eaa6a88f50 100644 (file)
--- a/viewer/view_btree.cpp
+++ b/viewer/view_btree.cpp
@@ -7,8 +7,8 @@ double ViewBTree::byte_to_pixels = 0;
 double ViewBTree::node_width = 0;
 double ViewBTree::node_height = 0;
 
-ViewBTree::ViewBTree (Canvas::Group *parent, std::string filename, uint block_size, int type):Canvas::Group (*parent, 0, 0),
-       BTree (filename, block_size, BTree::TYPE_IDENTIFICACION, type)
+ViewBTree::ViewBTree (Canvas::Group *parent, std::string filename, uint block_size, int tree_type, int type):Canvas::Group (*parent, 0, 0),
+       BTree (filename, block_size, tree_type, type)
 {
        /* Cada bytes lo hago de 5 units de ancho */
        node_width = 4 * block_size;
@@ -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)