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Listing 5-24. Custom model class declaration class MulModel : public QAbstractTableModel { public: MulModel( int rows, int columns, QObject *parent = 0 ); Qt::ItemFlags flags( const QModelIndex &index ) const; QVariant data( const QModelIndex &index, int role = Qt::DisplayRole ) const; QVariant headerData( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const; int rowCount( const QModelIndex &parent = QModelIndex() ) const; int columnCount( const QModelIndex &parent = QModelIndex() ) const; private: int m_rows, m_columns; }; The constructor simply remembers the number of rows and columns to show and then passes the parent on to the base class constructor. The rowCount and columnCount methods are just as simple as the constructor because they simply return the dimensions given to the constructor. You can see these methods in Listing 5-25.

Listing 10-8. The DynDialog class declaration class DynDialog : public QDialog { Q_OBJECT public: DynDialog(); protected: void changeEvent( QEvent* ); private slots: void languageChanged(); private: void translateUi(); QGroupBox *languages; QRadioButton *english; QRadioButton *swedish; }; The constructor shows that this dialog is intended to be translated dynamically. In the source code shown in Listing 10-9 the widgets are created, configured, and placed in layouts, but not a single call to setText or setTitle is made. Instead the translateUi method is called at the very end. Listing 10-9. The constructor of the DynDialog dialog notice that no texts are set DynDialog::DynDialog() : QDialog( 0 ) { languages = new QGroupBox( this ); english = new QRadioButton( this ); swedish = new QRadioButton( this ); english->setChecked( true ); qTranslator->load( "english" ); QVBoxLayout *baseLayout = new QVBoxLayout( this ); baseLayout->addWidget( languages ); QVBoxLayout *radioLayout = new QVBoxLayout( languages ); radioLayout->addWidget( english ); radioLayout->addWidget( swedish );

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In this example, you will perform a similar binding to that in the previous example but use JavaScript throughout instead of Atlas Script. This custom binding will update the contents of the label with the inverse of the text that is typed into the text box. You can see it in action in Figure 5-9.

connect( english, SIGNAL(toggled(bool)), this, SLOT(languageChanged()) ); connect( swedish, SIGNAL(toggled(bool)), this, SLOT(languageChanged()) ); translateUi(); } The translateUi method is shown in Listing 10-10. Here all the strings visible to the user are passed through tr and then set. Listing 10-10. Updating all the user visible strings at once void DynDialog::translateUi() { languages->setTitle( tr("Languages") ); english->setText( tr("English") ); swedish->setText( tr("Swedish") ); } Refer to Listing 10-9 to see that when the user picks another language (that is, toggles one of the radio buttons), the languageChanged slot is invoked. The slot implementation is shown in Listing 10-11. As you can see, the qTranslator loads a different translator for the different user choices. The qTranslator pointer is an application global pointer that points to the installed QTranslation object. The object is created and installed in the main function. Listing 10-11. Loading translations void DynDialog::languageChanged() { if( english->isChecked() ) qTranslator->load( "english" ); else qTranslator->load( "swedish" ); } When a new translation is loaded, the QEvent::LanguageChanged event is sent to all QObject instances. This event can be caught in the protected changeEvent method, as shown in Listing 10-12. As soon as the event is encountered, the translateUi method is called again, updating all visible texts using the newly loaded translator. Listing 10-12. Watch for the QEvent::LanguageChanged event and update the user interface when encountered. void DynDialog::changeEvent( QEvent *event ) { if( event->type() == QEvent::LanguageChange ) { translateUi(); }

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