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Listing 6-5. Returning the current text const QString& NumericKeypad::text() const { return m_text; } Using a composite widget is just as easy as using an ordinary widget. In Listing 6-6 you can see how the NumericKeypad widget is used. The keypad is placed over a label just to test the textChanged signal. The label s setText slot is connected to the keypad s textChanged signal. Figure 6-2 shows the application in action. The text of the QLineEdit is reflected by the QLabel at all times. Listing 6-6. Using the NumericKeypad widget int main( int argc, char **argv ) { QApplication app( argc, argv ); QWidget widget; QVBoxLayout *layout = new QVBoxLayout( &widget ); NumericKeypad pad; layout->addWidget( &pad ); QLabel *label = new QLabel; layout->addWidget( label ); QObject::connect( &pad, SIGNAL(textChanged(const QString&)), label, SLOT(setText(const QString&)) ); widget.show(); return app.exec(); }

Within WF a Policy activity contains the definition and execution of a RuleSet, which is a collection of rules with a set of execution steps. When you create a RuleSet for a Policy activity, the same types of actions occur as when you create a rule for an activity condition, as previously shown. A rules file is created for the workflow, and all rules are captured in this file. The steps to create the RuleSet are only a little different. Create a new VB Sequential Workflow Console Application called VBPolicySequentialConsole. Drag a Policy activity onto the Sequential workflow, leaving the default name. View code for the workflow and add the following declaration to the class: Private IntValue As Integer = 1 Click the Policy activity and view the properties. Find the RuleSetReference property, as shown in Figure 5-10. This property points to the RuleSet this Policy activity will use. This is similar to the example earlier, with the IfElse activity pointing to a Rule. In this case, a RuleSet is made up of one or more rules. Click the ellipse next to the RuleSetReference property, and the Select Rule Set dialog box appears. To create a RuleSet for this Policy activity, click the New RuleSet button, which opens the Rule Set Editor, as shown in Figure 5-11. This editor allows you to add multiple rules to the RuleSet.

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There are many benefits of composing widgets. Using the NumericKeypad widget with the main function is far easier than if all the buttons and the QLineEdit widget were configured there. Also, the signals and slots create a nice interface to connect the keypad to the rest of the widgets. Take a step back and look at the widget itself you see that the component is far more reusable than the knowledge of how to set up the solution. This makes it more likely to be used in more places in an application (or in more applications). As soon as you use it twice, you will save development time and effort since you need to set up the signal mapper only once. You also know that it works because you have verified it once saving you the problem of locating bugs.

Figure 5-16. Two HTML <span> elements that have click behaviors associated with their Atlas controls

Another way to customize widgets is by changing or enhancing their behavior. For example, a QLabel can make a great digital clock widget; all that is missing is the part that updates the text with the current time. The resulting widget can be seen in Figure 6-3.

Figure 6-3. A label acting as a clock By using an already existing widget as the starting point for a new widget, you avoid having to develop all the logic needed for painting, size hints, and such. Instead you can focus on enhancing the widget with the functionality you need. Let s see how this is done. First, there must be a method that checks the time at even intervals once every second, for example. The text has to be updated to the current time each time it is checked. To check the time every second, you can use a QTimer. A timer object can be set up to emit the timeout signal at a given interval. By connecting this signal to a slot of the clock label, you can check the time and update the text accordingly every second. Listing 6-7 shows the class declaration for the ClockLabel widget. It has a slot, updateTime, and a constructor. That (and inheriting QLabel) is all you need to implement this custom behavior. Listing 6-7. The ClockLabel class declaration class ClockLabel : public QLabel { Q_OBJECT public: ClockLabel( QWidget *parent = 0 ); private slots: void updateTime(); };

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