Problem with TreeView

[patrik08]

Have a look on:
http://www.qtcentre.org/forum/f-qt-p...view-4182.html

[MarkoSan]

Did you forget to setup Q_OBJECT macro in your classes?

[init2null]

Markosan, I guess it's better to use Q_OBJECT on the model, but since I wasn't using signals yet, it wasn't really necessary. In any case, I tried it and received the same result.

[init2null]

Hello Patrik, I'm not entirely sure how that post applies, since I really want to use the current design. I'm not really interested in editing either. My design is based on Qt's simpletreemodel example, so I know that I'm not too far away from working code.

[patrik08]

I dont say to swap design the file
http://ppk.ciz.ch/win_build/tree_cat_memo/Tree_Cat.zip
show only how to build a recursive function on model tree on XML
and other model to make the same on SQL or faster on sqlite3

if you have a recursive build model
you dont need this here ...

root->children[1]->append(new InternalItem());
    root->children[1]->children[0]->append(new InternalItem());
    root->children[1]->children[0]->children[0]->append(new InternalItem());

root->children[1]->append(new InternalItem());
    root->children[1]->children[0]->append(new InternalItem());
    root->children[1]->children[0]->children[0]->append(new InternalItem());

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sql tree query

#define MINISQL_TREE_NO_LIMIT "SELECT n.*, round((n.rgt-n.lft-1)/2,0) AS childs, count(*)+(n.lft>1) AS level, ((min(p.rgt)-n.rgt-(n.lft>1))/2) > 0 AS lower, (( (n.lft-max(p.lft)>1) )) AS upper FROM catememo n, catememo p WHERE n.lft BETWEEN p.lft AND p.rgt AND (p.root_id = n.root_id) AND (p.id != n.id OR n.lft = 1) GROUP BY n.root_id,n.id ORDER BY n.root_id,n.lft"

structure

query.exec("create table catememo (id INTEGER PRIMARY KEY AUTOINCREMENT,root_id INTEGER,name varchar(110),lft INTEGER,rgt INTEGER,oldid INTEGER,xmlattribute BLOB)");

Or online demo:
http://www.klempert.de/nested_sets/demo/

[init2null]

I really don't think XML or databases would be useful, since I'm just trying to show the hierarchy of a QGraphicsScene for a fancy scene debugger I'm working on. The code you quoted was just there for debugging purposes, since it shows the bug. The model I wrote (not the test case in this post) can successfully show the hierarchy right now, except it crashes just like this example when it is expanded twice.

[jpn]

The problem seems to be in TestModel::parent():

return createIndex(iindex->row(), 0, iindex->parent);
// vs.
return createIndex(iindex->parent->row(), 0, iindex->parent);

return createIndex(iindex->row(), 0, iindex->parent);
// vs.
return createIndex(iindex->parent->row(), 0, iindex->parent);

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[init2null]

That's it. Thank you! If and when my QGraphicsScene visualization tool becomes useful, I'll be sure to post it here.