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def explore_folder(c, name): """List the messages in folder `name` and let the user choose one.""" while True: c.select_folder(name, readonly=True) msgdict = c.fetch('1:*', ['BODY.PEEK[HEADER.FIELDS (FROM SUBJECT)]', 'FLAGS', 'INTERNALDATE', 'RFC822.SIZE']) print for uid in sorted(msgdict): items = msgdict[uid] print '%6d %20s %6d bytes %s' % ( uid, items['INTERNALDATE'], items['RFC822.SIZE'], ' '.join(items['FLAGS'])) for i in items['BODY[HEADER.FIELDS (FROM SUBJECT)]'].splitlines(): print ' ' * 6, i.strip() reply = raw_input('Folder %s - type a message UID, or "q" to quit: ' % name).strip() if reply.lower().startswith('q'):

If the id of the previous image is still in the list of id values, the currentImage index is updated to keep showing the same image If the same image can t be shown, the first image is shown (obviously, no image is shown if there are no images) Because the method affects the currentImage index value, it calls the updateCurrentImage method to update the user interface accordingly..

break try: reply = int(reply) except ValueError: print 'Please type an integer or "q" to quit' else: if reply in msgdict: explore_message(c, reply)

Listing 13-14. Get a new list of image id values and keep showing the current image if possible. void ImageDialog::updateImages() { int id; if( currentImage != -1 ) id = imageIds[ currentImage ]; else id = -1; imageIds = images.getIds( selectedTags() ); currentImage = imageIds.indexOf( id ); if( currentImage == -1 && !imageIds.isEmpty() ) currentImage = 0; ui.imagesLabel->setText( QString::number( imageIds.count() ) ); updateCurrentImage(); } The updateCurrentImage method, which is shown in Listing 13-15, checks to see whether there is a current image. If there is, the method gets it from the ImageCollection object and shows it by using the imageLabel widget. It also enables the Next, Previous, and Add Tag buttons. If there is no current image, the imageLabel is set to display the text "No Image", and the buttons are disabled. Listing 13-15. Update the currently shown image and make the right buttons available. void ImageDialog::updateCurrentImage() { if( currentImage == -1 ) { ui.imageLabel->setPixmap( QPixmap() ); ui.imageLabel->setText( tr("No Image") ); ui.addTagButton->setEnabled( false ); ui.nextButton->setEnabled( false ); ui.previousButton->setEnabled( false ); } else { ui.imageLabel->setPixmap( QPixmap::fromImage( images.getImage( imageIds[ currentImage ] ) ) ); ui.imageLabel->clear();

c.close_folder()

ui.addTagButton->setEnabled( true ); ui.nextButton->setEnabled( true ); ui.previousButton->setEnabled( true ); } } As helpful as the support methods seem to be, the heavy lifting is actually performed somewhere else. All the methods do is ask the ImageCollection object to do things and fetch things.

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def explore_account(c): """Display the folders in this IMAP account and let the user choose one.""" while True: print folderflags = {} data = c.list_folders() for flags, delimiter, name in data: folderflags[name] = flags for name in sorted(folderflags.keys()): print '%-30s %s' % (name, ' '.join(folderflags[name])) print reply = raw_input('Type a folder name, or "q" to quit: ').strip() if reply.lower().startswith('q'): break if reply in folderflags: explore_folder(c, reply) else: print 'Error: no folder named', repr(reply)

The ImageCollection class, which takes you one step closer to the database, is responsible for all contact with the database. It has been implemented so that it interacts with the rest of the application using relevant types. The rest of the application should not need to know that the ImageCollection is based around a database. The class declaration is shown in Listing 13-16. You might notice that some of the methods are named getXxx, which is not the common way to name a getter method in Qt application. The reason for this naming is to be able to tell the rest of the application that these methods actually reach out and get something from somewhere else; to indicate that the operation can take time depending on the circumstances. All methods perform a limited task, so you should be able to get an idea of what they do from their names. Listing 13-16. The ImageCollection class definition class ImageCollection { public: ImageCollection(); QImage getImage( int id ); QList<int> getIds( QStringList tags ); QStringList getTags(); void addTag( int id, QString tag ); void addImage( QImage image, QStringList tags ); private: void populateDatabase(); }; The class constructor, shown in Listing 13-17, opens a database connection and populates it. The entire class uses the default connection, so there is no need to keep a QSqlDatabase object. The database being accessed is an SQLite database stored in memory, so its content is lost each time the application is ended. This can be handy when developing, and it is easy to replace the database name :memory: with a proper file name and let the database be the file format of the application.

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