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The third validator is a <rangeValidator> that, when used with a number, allows you to specify a maximum and a minimum so that if the value falls outside this range, the validation will trip. You configure these with the lowerBound and upperBound attributes. In this case, these values are set to 10 and 20, respectively. Note that these are inclusive, so 10 and 20 are valid values. You can see where this validator is tripped in Figure 5-15. In this case, the text box contains something, so the requiredFieldValidator is OK. It contains a valid number, so the typeValidator is also satisfied. However, the number, 8, is outside the range specified by the rangeValidator, so the red asterisk will appear, and the tooltip gives details of why the data is considered invalid. So, as you can see from this example, you can set up some pretty sophisticated validation rules by stacking validators on top of each other. Where typically you may have programmed rules like this with JavaScript and nested if statements, this declarative approach lends itself nicely for tools to generate these rules.

The rest of the application needs to know the text of the QLineEdit; everything else just obfuscates the source code of your application. Listing 6-1 shows the class declaration of the NumericKeypad class. If you focus on the signals and public sections you see that the text is all that is available. The private sections are concerned with the internals of the widget: the text, the line edit, and a slot for catching the input from the buttons. Listing 6-1. The class declaration of the composite widget NumericKeypad class NumericKeypad : public QWidget { Q_OBJECT public: NumericKeypad( QWidget *parent = 0 ); const QString& text() const; public slots: void setText( const QString &text ); signals: void textChanged( const QString &text ); private slots: void buttonClicked( const QString &text ); private: QLineEdit *m_lineEdit; QString m_text; }; Before you look at how the text is managed, you should understand how the widget is constructed. You can tell that the widget is based on a QWidget from the class declaration. In the constructor a layout is applied to the QWidget (this); then the QLineEdit and the QPushButton widgets are put in the layout. The source code is shown in Listing 6-2. Listing 6-2. Creating and laying out the buttons in the constructor NumericKeypad::NumericKeypad( QWidget *parent ) { QGridLayout *layout = new QGridLayout( this ); m_lineEdit = new QLineEdit m_lineEdit->setAlignment( Qt::AlignRight ); QPushButton *button0 = new QPushButton( tr("0") ); QPushButton *button1 = new QPushButton( tr("1") ); ...

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QPushButton *buttonDot = new QPushButton( tr(".") ); QPushButton *buttonClear = new QPushButton( tr("C") ); layout->addWidget( m_lineEdit, 0, 0, 1, 3 ); layout->addWidget( layout->addWidget( ... layout->addWidget( layout->addWidget( ... } You will probably find the parts of the constructor that were left out of the previous example more interesting. Each QPushButton object, except the C button, is mapped to a QString using the setMapping(QObject *, const QString&) method of QSignalMapper. When all the mappings have been set up, the clicked() signals from the buttons are all connected to the map() slot of the signal mapper. When map is called, the signal mapper will look at the signal sender and emit the mapped string through the mapped(const QString&) signal. This signal is in turn connected to the buttonClicked(const QString&) slot of this. You can see how this is set up in Listing 6-3. The listing also shows that the C button s clicked signal is mapped to the clear slot of the QLineEdit, and the textChanged signal of the QLineEdit is connected to the setText method of the keypad widget. This means that clicking the C button clears the text; any changes to the QLineEdit either by user interaction or pressing the C button update the text of the NumericKeypad object. Listing 6-3. Setting up the signal mapping in the constructor NumericKeypad::NumericKeypad( QWidget *parent ) { ... layout->addWidget( buttonDot, 4, 1 ); layout->addWidget( buttonClear, 4, 2 ); QSignalMapper *mapper = new QSignalMapper( this ); mapper->setMapping( mapper->setMapping( ... mapper->setMapping( mapper->setMapping( button0, "0" ); button1, "1" ); button9, "9" ); buttonDot, "." ); button1, 1, 0 ); button2, 1, 1 ); buttonDot, 4, 1 ); buttonClear, 4, 2 );

Table 5-1. Valid Rules Condition Operators (Continued)

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