C++ Tree View operation

[fullmetalcoder]

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.

[zeeb100]

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?

[fullmetalcoder]

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

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 :

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;
};

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;
};

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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).

[zeeb100]

it's really hard :s

[fullmetalcoder]

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.

[zeeb100]

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

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;
};

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;
};

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how can access item of model ???

example

insert a child in the parent specify

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

parent_z
   child1
   child2

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

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