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Listing 5-38. Easy as one, two, three . . . the constructor just fills the list. IntModel::IntModel( int count, QObject *parent ) { for( int i=0; i<count; ++i ) m_values << i+1; } The number of rows equals the count property of the m_values list. This means that rowCount is as simple as Listing 5-39. Listing 5-39. The number of rows is the number of items in the list. int IntModel::rowCount( const QModelIndex &parent ) const { return m_values.count(); } Returning data for each index is also easy (see Listing 5-40); you can use the rows property of the index to look up the right value in the m_values list. The same QVariant for the DisplayRole as the EditRole is returned. The EditRole represents the value used to initialize the editor. If you leave it out, the user has to start with an empty editor every time. Listing 5-40. Returning values is as simple as looking in the list. QVariant IntModel::data( const QModelIndex &index, int role ) const { if( role != Qt::DisplayRole || role != Qt::EditRole ) return QVariant(); if( index.column() == 0 && index.row() < m_values.count() ) return m_values.at( index.row() ); else return QVariant(); } To make an item editable, it is important to return the flag value ItemIsEditable as well as ItemIsSelectable. By returning ItemIsEnabled, the item also looks active. The flag method is shown in Listing 5-41. Listing 5-41. Flagging editability, selectability, and being enabled Qt::ItemFlags IntModel::flags( const QModelIndex &index ) const { if(!index.isValid()) return Qt::ItemIsEnabled; return Qt::ItemIsSelectable | Qt::ItemIsEditable | Qt::ItemIsEnabled; }

Livingston: What else went wrong Trott: Skimping on hardware sometimes. I wouldn t recommend that. We

often had to replace the stuff we bought because we had been so worried about costs. But that s not always a bad thing. With LiveJournal, Brad [Fitzpatrick] wrote everything instead of buying things. That worked for him. He did his

Start() Now that you understand how the server works, let s take a look at the client, which is in many ways a good deal simpler than the server Listing 10-2 shows the full code for the client, which is followed by a discussion of how the code works Listing 10-2 A Chat Client #light open System open SystemComponentModel open SystemIO.

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Listing 5-42 shows the setData method, which is the most complex method of the entire IntModel class and still fits in seven lines of code. It first checks that the given index is valid and that the role is the EditRole. (The EditRole is the data in a format suitable for editing and is what you get from the view after the user has edited a value.) After you establish that the index and role are fine, you must ensure that an actual change has taken place. If the value has not changed (or if the index or role is invalid), false is returned, indicating that no change has taken place. When an actual change has taken place, the model s value is updated, and the dataChanged signal is emitted before returning true. Don t forget emitting the signal and returning the correct value; otherwise, the interaction between the models and views will fail. Listing 5-42. Updating the model according to an edit action bool IntModel::setData( const QModelIndex &index, const QVariant &value, int role ) { if( role != Qt::EditRole || index.column() != 0 || index.row() >= m_values.count() ) return false; if( value.toInt() == m_values.at( index.row() ) ) return false; m_values[ index.row() ] = value.toInt(); emit dataChanged( index, index ); return true; } Listing 5-43 and Figure 5-11 show IntModel in use. The model being editable does not affect the main function in any way. This is something that the model and view agree on using the return value from the flag method of the model. Listing 5-43. Using the IntModel with a QListView int main( int argc, char **argv ) { QApplication app( argc, argv ); IntModel model( 25 ); QListView list; list.setModel( &model ); list.show(); return app.exec(); }

thing for 6 years. So I think it works, but we had a different scale than LiveJournal, which took a long time to get a large base.

It was meant for people who knew their way around installing server software. We realized that more and more people were coming to blogging with less and less experience. That s relative to the people who are coming in now, who probably have only installed one web application. So we wanted to have a service that anybody could use. That s why we started developing TypePad. It s a lot more like WYSIWYG, and you can drag and drop items into your templates, and you don t have to know any coding. It s a very different product than Movable Type.

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