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You will use the QTextEdit class as your document class because it contains all the functionality you need. It can handle creating and editing text, as well as copying and pasting to and from the clipboard. This leaves you with only the tasks of implementing the functionality for creating new documents and closing any open documents. Creating new documents is easy. All it takes is bringing up a new main window the constructor shown in Listing 4-1 will do all the hard work. Listing 4-4 shows the trivial implementation of the fileNew() slot. It creates a new window and then shows it. Listing 4-4. Creating a new document void SdiWindow::fileNew() { (new SdiWindow())->show(); } Closing documents is more complex because a document (or the window containing a document) can be closed in many different ways. One possible cause is the window manager telling the window to close for various reasons. For example, perhaps the user is trying to close the window by clicking the close button in the title bar. Or the computer is shutting down. Or the user is choosing Exit or Close from the File menu of the application. To intercept all these user actions that end up in attempts to close the current window, you can implement an event handler for the close event by overriding the closeEvent(QCloseEvent*) method. Listing 4-5 shows the SDI application implementation. Listing 4-5. Closing a document void SdiWindow::closeEvent( QCloseEvent *event ) { if( isSafeToClose() ) event->accept(); else event->ignore(); } bool SdiWindow::isSafeToClose() { if( isWindowModified() )

If all you ever want to send across the network is text, then encoding and framing (which we tackle in the next section) will be your only worries But sometimes you might want to represent your data in a more compact format than text makes possible Or you might be writing Python code to interface with a service that has already made the choice to use raw binary data In either case, you will probably have to start worrying about a new issue: network byte order To understand the issue of byte order, consider the process of sending an integer over the network To be specific, think about the integer 4253 Many protocols, of course, will simply transmit this integer as the string '4253' that is, as four distinct characters The four digits will require at least four bytes to transmit, at least in any common text encoding.

{ switch( QMessageBox::warning( this, tr("SDI"), tr("The document has unsaved changes.\n" "Do you want to save it before it is closed "), QMessageBox::Discard | QMessageBox::Cancel ) ) { case QMessageBox::Cancel: return false; default: return true; } } return true; } You can choose to accept() or ignore() an event: ignoring a close event leaves the window open, and accepting it closes the window. To ensure that it is safe to close the window, use the isSafeToClose method, which ascertains whether the document has been modified using isWindowModified(). If the document hasn t been modified, it is safe to close it. If the document has been modified, ask the user whether it is okay to discard the changes using a QMessageBox.

And using decimal digits will also involve some computational expense: since numbers are not stored inside computers in base 10, it will take repeated division with inspection of the remainder to determine that this number is in fact made of 4 thousands, plus 2 hundreds, plus 5 tens, plus 3 left over And when the four-digit string '4253' is received, repeated addition and multiplication by powers of ten will be necessary to put the text back together into a number Despite its verbosity, the technique of using plain text for numbers may actually be the most popular on the Internet today Every time you fetch a web page, for example, the HTTP protocol expresses the Content-Length of the result using a string of decimal digits just like '4253' Both the web server and client do the decimal conversion without a second thought, despite the bit of expense.

QMessageBox is very useful when it comes to displaying short pieces of information to the user. The Tip four static methods information, question, warning, and critical can be used to show messages of different importance. All four methods accept five arguments: a parent widget, a title text, a message text, the combinations of buttons to show, and the button that will be used as the default button. The buttons and default button all have default settings.

Much of the story of the last 20 years in networking, in fact, has been the replacement of dense binary formats with protocols that are simple, obvious, and human-readable even if computationally expensive compared to their predecessors (Of course, multiplication and division are also cheaper on modern processors than back when binary formats were more common not only because processors have experienced a vast increase in speed, but because their designers have become much more clever about implementing integer math, so that the same operation requires far fewer cycles today than on the processors of, say, the early 1980s) In any case, the string '4253' is not how your computer represents this number as an integer variable in Python.

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