C++ Tree View operation

hi guy ... can you help me to create a struct or give some example to do :

Original

Code:

---

+item1
+item2
-item3
    +child1_item
    +child2_item
    -child3_item
       item_c31
       item_c32
       item_c33
-item4
   +child1_item
   +child2_item
   -child3_item
      item_c31
+item5

---

if i remove item4->child3_item->item2 struct 'll be

Code:

---

+item1
+item2
-item3
   +child1_item
   +child2_item
   -child3_item
      item_c31
      itemc_33
-item4
   +child1_item
   +child2_item
   -child3_item
      item_c31
+item5

---

if i remove item4->child3_item struct 'll be

Code:

---

+item1
+item2
-item3
   +child1_item
   +child2_item
   -child3_item
      item_c31
      item_c32
      item_c33
-item4
   +child1_item
   +child2_item
+item5

---

if i add item

Code:

---

+item1
+item2
-item3
   +child1_item
   +child2_item
   -child3_item
       item1
       item2
       item3
-item4
   +child1_item
   +child2_item
   -child3_item
      item_c31
+item5
+item6

---

and other operation as add child_item ot add item_c, remove . . .

this is very importa for me please help me i don't have any idea to do this... ;(

if you are looking for a widget you should have a look at QTreeWidget
if what you want is a data structure (but not a view to display it). You'll have to create it in a very classical way :

Code:

---

class TreeNode
{
public:
    // methods here
private:
    TreeNode *m_parent;
    QList<TreeNode*> m_children;
};

---

managing the hierarchy of such a structure is quite straightforward but you need to be careful about memory leaks (yeah, the node class MUST be allocated dynamically and used through pointers, there is no alternative).

thank for reply .. but i show... there are problem to show this ????

Sorry I really don't understand what you mean...

If you just want a ready-to-use tree structure that you can display in a couple of lines than QTreeWidget is definitely the right choice.

If you want to create your own low-level tree structure you can use the skeleton I showed you. To display that you will have to create a custom model and set it to a QTreeView. The tree model example is a pretty good start for that.

fullmetalcoder oyu are my hero !!


the example is perfect. on that basis I would like to add a node, delete a parent node with all children, add a child to a father. I can do it right?

Quote:

---

Originally Posted by zeeb100

fullmetalcoder oyu are my hero !!

---

My pleasure. :) If my answer did spare you some headbanging and hours of frustration consider using that shiny "thanks" button below the posts ;)

Quote:

---

Originally Posted by zeeb100

on that basis I would like to add a node, delete a parent node with all children, add a child to a father. I can do it right?

---

Sure you can. Once you have added proper methods to your node class adding/removing children is child's play. e.g :

Code:

---

class TreeNode
{
public:
    ~TreeNode()
    {
         qDeleteAll(m_children);
    }
    void appendChild(TreeNode *c)
    {
         m_children.append(c);
    }
    void removeChild(int row)
    {
         m_children.removeAt(row);
    }
    void deleteChildRecursively(int row)
    {
         TreeNode *c = m_children.takeAt(row);
         delete c;
    }
private:
    TreeNode *m_parent;
    QList<TreeNode*> m_children;
};

---

Please not that the above code is just a skeleton which won't work as is (it does not deal with model/view updating for instance, which is described in the example I refered to in my previous post).

:eek::( it's really hard :s

Yeah, model/view is a bit hard to master but hopefully the tutorials are quite good.

If you need more example of custom tree model you can have a look at those I have created for use in Edyuk : https://edyuk.svn.sf.net/svnroot/edy...projectmodel2/ and https://edyuk.svn.sf.net/svnroot/edy...y/qcodemodel2/

They are not very documented but the code is clean enough to serve as an example.

now i use the struct of exemple tree view ok ... but i don't do the this function

Code:

---

class TreeNode
{
public:
    ~TreeNode()
    {
         qDeleteAll(m_children);
    }
    void appendChild(TreeNode *c)
    {
         m_children.append(c);
    }
    void removeChild(int row)
    {
         m_children.removeAt(row);
    }
    void deleteChildRecursively(int row)
    {
         TreeNode *c = m_children.takeAt(row);
         delete c;
    }
private:
    TreeNode *m_parent;
    QList<TreeNode*> m_children;
};

---

how can access item of model ???

example

insert a child in the parent specify

Code:

---

parent_z
   child1
   child2
 
......
insert(child3) into parent_z
......
parent_z
   child1
   child2
   child3

---

i ok there are successful. but the function ~TreeItem (); it does not eliminate the node because if I execute row count the same value returns always


i use the The tree model example