[Qt-interest] QTreeView and custom QAbstractItemModel performance problem

[Felix Brack]

On 09.07.2010 12:06, Andre Somers wrote:
> On 9-7-2010 11:57, Felix Brack wrote:
>> an
>> Well, I had no hasChildren() until now... My new hasChildren() looks
>> like this:
>>
>> bool CMultiColumnListModel::hasChildren(const QModelIndex& Parent) const
>> {
>> return (QModelIndex()==Parent);
>> }
>>
>> Adding hasChildren() however does not change things with respect to
>> performance and CPU load.
>>
> If I understood you correctly, your model represents a table, right?
> That means: no children to any of the items.
>
> If so, why not just implement the above as:
>
> bool CMultiColumnListModel::hasChildren(const QModelIndex& Parent) const
> {
> Q_UNUSED(Parent)
> return false;
> }
>
>
> André
>

In fact it is a table, yes. There is one root item. All rows have the 
root item as parent. Every row consist of the same number of columns. 
The existence of a root item leads to my code of hasChildren().

Felix