QTreeWidgetItem Subclassing

[soxs060389]

Hi, I want to subclass QTreeWidgetItem and use it within a QTreeWidget subclass, but I do not want to reimplement all functions from QTreeWidgetItem nore QTreeWidget.

So far so god.

Additionally I need the option to dynamically update the TreeWidget.

I create a method to search for applicable TreeWidgetItems:

/*! search from root (if root is zer0, search all nodes) all children for the Desired Drawable
 */
TreeWidgetItem* TreeWidget::deepSearchByPtr(TreeWidgetItem *root, Drawable *d){
    qDebug() << "DFS 0";
    if (root == 0){
    }
    else if (reinterpret_cast<Drawable*>(root->ptr()) == d){
        qDebug() << "DFS B";
        return root;
    }
 
    qDebug() << "DFS C";
    TreeWidgetItem *ret;
    TreeWidgetItem *child;
    qDebug() << "DFS D";
    int count(0);
    if (root==0){
        count = invisibleRootItem()->childCount();
    }
    else{
        count = root->childCount();
    }
    for(int q(0); q<count; ++q){
        qDebug() << "DFS LOOP A";
        child = reinterpret_cast<TreeWidgetItem*>(root->child(q));
        qDebug() << "DFS LOOP B";
        if (child == NULL){
            qDebug() << "DFS LOOP C";
            continue;
        }
        qDebug() << "DFS LOOP D";
        ret = deepSearchByPtr(child, d);
        qDebug() << "DFS LOOP E";
        if (ret != NULL){
            qDebug() << "DFS LOOP F";
            return ret;
        }
    }
 
    return NULL;
}

/*! search from root (if root is zer0, search all nodes) all children for the Desired Drawable
 */
TreeWidgetItem* TreeWidget::deepSearchByPtr(TreeWidgetItem *root, Drawable *d){
    qDebug() << "DFS 0";
    if (root == 0){
    }
    else if (reinterpret_cast<Drawable*>(root->ptr()) == d){
        qDebug() << "DFS B";
        return root;
    }

    qDebug() << "DFS C";
    TreeWidgetItem *ret;
    TreeWidgetItem *child;
    qDebug() << "DFS D";
    int count(0);
    if (root==0){
        count = invisibleRootItem()->childCount();
    }
    else{
        count = root->childCount();
    }
    for(int q(0); q<count; ++q){
        qDebug() << "DFS LOOP A";
        child = reinterpret_cast<TreeWidgetItem*>(root->child(q));
        qDebug() << "DFS LOOP B";
        if (child == NULL){
            qDebug() << "DFS LOOP C";
            continue;
        }
        qDebug() << "DFS LOOP D";
        ret = deepSearchByPtr(child, d);
        qDebug() << "DFS LOOP E";
        if (ret != NULL){
            qDebug() << "DFS LOOP F";
            return ret;
        }
    }

    return NULL;
}

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The Problem with that is, that it fails right before

qDebug() << "DFS LOOP B";

qDebug() << "DFS LOOP B";

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though all children actually are TreeWidgetItem s.

Note: falling back to QTreeWidgetItems is not an option, as they hold way more data than ptr.

Note:
My Custom Type is called "TreeWidgetItem" and "TreeWIdget"

can anybody plx help me to fix this issue.

Sincerely

soxs060389

P.S. allready wasted hours on that subject...

[high_flyer]

your code allows
child = reinterpret_cast<TreeWidgetItem*>(root->child(q));

to be called even if 'root == NULL'.

[soxs060389]

Thank you very much, it was definitly too late to search for bugs yesterday O.o

Solved