[Qt-interest] QTree

[Xiaolei Shang]

  Hi:
> On 2011/01/20 03:55 PM, Alex Strickland wrote:
>
>   >  I am just starting out to learn about Model/View via the Simple Tree
>   >  Model example. The tree used in the example looks functional, but it
>   >  lead me to look for a QTree (or similar) class but I couldn't find
>   >  anything. Is there such a thing?
>
> I took Konrad Rosenbaums suggestion and used QStandardItemModel. From
> the docs I took something like this :
>
>       QStandardItemModel *treeModel = new QStandardItemModel();
>       QStandardItem *parentItem = treeModel->invisibleRootItem();
>
>       for (int i = 0; i<  4; ++i) {
>           QStandardItem *item = new QStandardItem(QString("item %0").arg(i));
>           parentItem->appendRow(item);
>           parentItem = item;
>       }
>
> which works. Then, because I wanted checkboxes, I did this, which also
> works, but does not create a tree:
>
>       for (int i = 0; i<  4; ++i) {
>           QList<QStandardItem *>  items;
>           items.append(new QStandardItem(QString("item %0").arg(i)));
>           QStandardItem *itemX = new QStandardItem();
>           itemX->setCheckable(true);
>           items.append(itemX);
>
>           parentItem->appendRow(items);
>       }
I think you missed the line setting the last item in a level as parent. 
If you still want to form a 4 levels tree structure as your first 
example, you should do:

for (int i = 0; i<  4; ++i) {
          QList<QStandardItem *>  items;
          items.append(new QStandardItem(QString("item %0").arg(i)));
          QStandardItem *itemX = new QStandardItem();
          itemX->setCheckable(true);
          items.append(itemX);

          parentItem->appendRow(items);
          parentItem = items.at(0);
      }

Hope this helps.

Xiaolei

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.qt-project.org/pipermail/qt-interest-old/attachments/20110121/013a58de/attachment.html