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return parentObject->children().count(); } int ObjectTreeModel::columnCount(const QModelIndex &parent ) const { return 2; } Getting the data is almost as easy as calculating the number of rows. The object name for the first column is available through the objectName property, whereas you have to get the QMetaObject to obtain the class name for the second column. You also have to make sure to return it only for the DisplayRole. The ToolTipRole was left out of Listing 5-34, but you can see how the DisplayRole data is retrieved. Listing 5-34. Returning the actual data for each index QVariant ObjectTreeModel::data( const QModelIndex &index, int role) const { if( !index.isValid() ) return QVariant(); if( role == Qt::DisplayRole ) { switch( index.column() ) { case 0: return static_cast<QObject*>( index.internalPointer() )->objectName(); case 1: return static_cast<QObject*>( index.internalPointer() )-> metaObject()->className(); default: break; } } else if( role == Qt::ToolTipRole ) { ... } return QVariant(); } The last method implementation is slightly more complex: the parent method (see Listing 5-35) returns an index for the parent of a given index. It is easy to find the parent of the QObject that you get from the index, but you also need to get a row number for that parent.

20 offices, and I said, If we need an office that big in a year from now, then I don t know what we re doing, because we don t need that many people. He said, OK. You can make that decision. So we got like a 1,500-square-foot office that we outgrew in 8 months. People asked why we got such a small office, and it was because I thought everything else was too big. I realized that on my own. It was really important; he did it in a good way.

Livingston: This is surprising, based on the stories I ve heard about investors. Trott: The Neoteny investment was such an anomaly. We were this incredibly

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danger of the stack overflowing. This is because the function is tail recursive, meaning that the compiler emits a special tail instruction that tells the .NET runtime that the function should be called without using the stack to store parameters and local variables. Any recursive function defined in F# that has the recursive call as the last thing that happens in the function is tail recursive.

The solution is to see that if the parent object is not the root object, it must also have a grandparent. Using the indexOf method on the children array of the grandparent, you can get the row of the parent. It s important to know the order of your children! Listing 5-35. Building an index for the parent requires asking the grandparent for the indexOf method. QModelIndex ObjectTreeModel::parent(const QModelIndex &index) const { if( !index.isValid() ) return QModelIndex(); QObject *indexObject = static_cast<QObject*>( index.internalPointer() ); QObject *parentObject = indexObject->parent(); if( parentObject == m_root ) return QModelIndex(); QObject *grandParentObject = parentObject->parent(); return createIndex( grandParentObject->children().indexOf( parentObject ), 0, parentObject ); } To try out the all-new ObjectTreeModel, you can use the main function from Listing 5-36. The largest part of the main function is used to build a tree of QObjects. Creating a model with a pointer to the root object and passing it to the view is done in just four lines of code (and that includes creating and showing the view). The running application is shown in Figure 5-10. Listing 5-36. Building a tree of QObjects and then showing it using the custom tree model int main( int argc, char **argv ) { QApplication app( argc, argv ); QObject root; root.setObjectName( "root" ); QObject *child; QObject *foo = new QObject( &root ); foo->setObjectName( "foo" ); child = new QObject( foo ); child->setObjectName( "Mark" ); child = new QObject( foo ); child->setObjectName( "Bob" ); child = new QObject( foo ); child->setObjectName( "Kent" );

early-stage company that had no structure, no employees, no really good accounting, nothing but the LLC. But we had a huge customer base, which I don t think most startups have. We had hundreds of thousands of people using our products, and it had been operated with so few resources. So we had to really start from scratch. If it wasn t for Barak, I don t know where we would be now. We knew what we knew, which was the product. But there were all these little things that you just have no clue about. It was incredibly overwhelming. But if you think about it too much, then you don t do it. You almost have to not know what you re getting into to actually do it.

Livingston: Tell me about other things that went wrong. Trott: Ben and I were still trying to do everything ourselves, and that was

QObject *bar = new QObject( &root ); bar->setObjectName( "bar" ); ... ObjectTreeModel model( &root ); QTreeView tree; tree.setModel( &model ); tree.show(); return app.exec(); }

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