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void ImageDialog::previousClicked() { currentImage --; if( currentImage == -1 ) currentImage = imageIds.count()-1; updateCurrentImage(); } void ImageDialog::tagsChanged() { updateImages(); } The next slot, addTagClicked, can be seen in Listing 13-10. The slot is invoked when the user wants to add a tag to the current image. The slot starts by asking the user for a tag by showing a QInputDialog. If the user specifies a string, the text entered is converted to lowercase and is checked so that it meets the standards for a tag. In this case, that means that it consists of only the characters a z. No spaces, no special characters, no umlauts or other local characters; just a z. The actual check is performed using a regular expression. If the text is found to be an actual tag, ask the ImageCollection object images to add the tag to the current image. When the tag has been added, you need to update the tag list and call updateTags. Listing 13-10. Adding a tag to the current image void ImageDialog::addTagClicked() { bool ok; QString tag = QInputDialog::getText( this, tr("Image Book"), tr("Tag:"), QLineEdit::Normal, QString(), &ok ); if( ok ) { tag = tag.toLower(); QRegExp re( "[a-z]+" ); if( re.exactMatch(tag)) { QMessageBox::warning( this, tr("Image Book"), tr("This is not a valid tag. " "Tags consists of lower case characters a-z.") ); return; }

E-mail messages can be quite large, and so can mail folders many mail systems permit users to have hundreds or thousands of messages, that can each be 10MB or more. That kind of mailbox can easily exceed the RAM on the client machine if its contents are all downloaded at once, as in the previous example. To help network-based mail clients that do not want to keep local copies of every message, IMAP supports several operations besides the big fetch the whole message command that we saw in the previous section. An e-mail s headers can be downloaded as a block of text, separately from the message. Particular headers from a message can be requested and returned. The server can be asked to recursively explore and return an outline of the MIME structure of a message. The text of particular sections of the message can be returned.

images.addTag( imageIds[ currentImage ], tag ); updateTags(); } } The remaining slot, addImageClicked (shown in Listing 13-11), is used when the user wants to add a new image to the collection. The slot also applies the currently selected tags to the image to make sure that it stays visible. The first thing the slot does is ask the user to pick a PNG image using a QFileDialog. When an image has been picked, it is loaded. If the loading fails, the rest of the slot is aborted. If the loading succeeds, the image is added to the ImageCollection, along with the currently selected tags. To get the tags, use the selectedTags method. When the image has been added, you need to update the list of image id values. To take care of this, call the updateImages method. Listing 13-11. Adding an image to the collection with the current tags void ImageDialog::addImageClicked() { QString filename = QFileDialog::getOpenFileName( this, tr("Open file"), QString(), tr("PNG Images (*.png)") ); if( !filename.isNull() ) { QImage image( filename ); if( image.isNull() ) { QMessageBox::warning( this, tr("Image Book"), tr("Failed to open the file '%1'").arg( filename ) ); return; } images.addImage( image, selectedTags() ); updateImages(); } } As you can see, slots are fairly simple. They sometimes ensure that the user input is valid before passing it on to the ImageCollection object. When something has to be updated, the appropriate support method is used.

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This allows IMAP clients to perform very efficient queries that download only the information they need to display for the user, decreasing the load on the IMAP server and the network, and allowing results to be displayed more quickly to the user. For an example of how a simple IMAP client works, examine Listing 15 7, which puts together a number of ideas about browsing an IMAP account. Hopefully this provides more context than would be possible if these features were spread out over a half-dozen shorter program listings at this point in the chapter! You can see that the client consists of three concentric loops that each take input from the user as he or she views the list of mail folders, then the list of messages within a particular mail folder, and finally the sections of a specific message.

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