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Figure 9-13. The first page of the example wizard A wizard is nothing more than a dialog to the rest of the application. Listing 9-11 shows the declaration of the Wizard dialog class. The public interface contains only a constructor. The private part of the interface consists of slots for the Next and Previous buttons, followed by a number of pointers to the different widgets from which the dialog is composed. Listing 9-11. The declaration of a wizard class class Wizard : public QDialog { Q_OBJECT public: Wizard(); private slots: void doNext(); void doPrev(); private: QPushButton *next; QPushButton *previous; QStackedWidget *pages; PageOne *pageOne; PageTwo *pageTwo; PageThree *pageThree; }; In the wizard I chose to place all logic in the Wizard class, so all the pages simply handle the visual details. The controls that can be accessed later, such as checkboxes and line edits

Before we test the mashup, let s look at what is happening behind the scenes. While you are viewing the sources and values of the News Reader, click the Switch to an advanced view button at the top of the block. If you are familiar with JavaScript, you will recognize the code shown in Figure 3-9. Experienced JavaScript users can add new code or adjust the code generated for the News Reader block. It is important to fully understand block architecture before making changes in the advanced view (more on that in 7). Editing the code in advanced view turns the color of the block gray. You don t want make changes, so click Go back to the simple view .

It also contains a file attachment, complete with a suggested file name in case the user wants to download it to the local filesystem Our sample program does not attempt to save anything to the hard drive, both for simplicity and safety; instead, the user can select any portion of the message such as the special sections HEADER and TEXT, or one of the specific parts like 11 and its content will be printed to the screen If you examine the program listing, you will see that all of this is supported simply by calls to the IMAP fetch() method Part names like HEADER and 11 are simply more options for what you can specify when you call fetch(), and can be used right alongside other values like BODYPEEK and FLAGS.

with user configurations, are made public members in the page classes The first page from Figure 9-13 is shown in Listing 9-12 The listing starts with the class declaration For the first page, only the constructor and the checkbox for accepting the rules are available because the Wizard class needs to be able to tell whether the Next button is to be enabled or disabled The other half of the listing consists of the implementation of the constructor, in which the widgets are created, set up, and put in the layout The QTextEdit widget is used as a reader, so the readOnly property is set to true before the text is set using setHtml Listing 9-12.

The only difference is that the latter values work for all messages, whereas a part name like 213 would exist only for multipart messages whose structure included a part with that designation One oddity you will note is that the IMAP protocol does not actually provide you with any of the multipart names that a particular message supports! Instead, you have to count the number of parts listed in the BODYSTRUCTURE starting with the index 1 in order to determine which part number you should ask for You can see that our display_structure() routine here uses a simple loop to accomplish this counting.

The first page of the wizard class PageOne : public QWidget { public: PageOne( QWidget *parent = 0 ); QCheckBox *acceptDeal; }; PageOne::PageOne( QWidget *parent ) : QWidget(parent) { QGridLayout *layout = new QGridLayout( this ); QTextEdit *textEdit = new QTextEdit; textEdit->setReadOnly( true ); textEdit->setHtml( tr("<h1>The Rules</h1>" "<p>The rules are to be followed!</p>") ); acceptDeal = new QCheckBox( tr("I accept") ); layout->addWidget( textEdit, 0, 0, 1, 2 ); layout->addWidget( acceptDeal, 1, 1 ); } There is still one piece missing before you can show the first page in the wizard dialog: the constructor The constructor takes care of creating the Next, Previous, and Cancel buttons; creates the pages; and puts them in a stack before applying layouts and making the needed connections The source code for the constructor is shown in Listing 9-13.

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