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void Dialog::buttonClicked() { QMessageBox::information( this, tr("Wohoo!"), tr("You clicked the button!") ); } The dialog, combined with a minimal main function, produces the dialog shown in Figure 7-26. In the figure, the top button is disabled, the middle button is being pressed, while the bottom one is an inactive toggle button.

And all of this can have a startling impact on your approach toward concurrency, especially where shared resources are concerned When all of your application s work and resources are present within a single address space containing dozens of Python packages and libraries, then it can seem like semaphores, locks, and shared data structures despite all of the problems inherent in using them correctly are the natural mechanisms for cooperation But message services offer a different model: that of small, autonomous services attached to a common queue, that let the queue take care of getting information namely, messages safely back and forth between dozens of different processes.

If you need to create a completely new widget (something that does not act like any other widget), you have to subclass the QWidget class directly. This enables you to do anything, but that freedom also comes with responsibilities. All internal states have to be managed by you, as will all repainting and size hinting. Let s start by looking at what you re trying to do. The widget that you ll create is called CircleWidget and will listen to mouse events. When the mouse is pressed, a circle is created. As long as a mouse button is pressed within the circle, the circle grows. If the mouse is pressed while the pointer is kept outside the circle, the circle will shrink until it disappears, and a new circle will start to grow where the pointer was when the first circle disappeared (see Figure 7-27).

Suddenly, you will find yourself writing Python components that begin to take on the pleasant concurrent semantics of Erlang function calls: they will accept a request, use their carefully husbanded resources to generate a response, and never once explicitly touch a shared data structure The message queue will not only take care of shuttling data back and forth, but by letting client procedures that have sent requests wait on server procedures that are generating results, the message queue also provides a well-defined synchrony with which your processes can coordinate their activity If you are not yet ready to try external message queues, be sure to at least look very closely at the Python Standard Library when writing concurrent programs, paying close attention to the queue module and also to the between-process Queue that is offered by the multiprocessing library.

TwitterClass.prototype.getLatestPosts = function() { var root = environment.getXml ("http://twitter.com/statuses/public_timeline.xml"); var count = root.getElementsByTagName('status').length; var statusArray = new Array(count); var status = root.getElementsByTagName('status'); for (var i=0; i<count; i++) { var messageID="", text="", createdAt="", userID="", screenName=""; var location="", description="", imageUrl="", url=""; var statusItems=status[i].childNodes; for (var k=0; k<statusItems.length; k++) { if (statusItems[k].nodeType != 1) // nuisance node { } else if (statusItems[k].firstChild != null) { switch (statusItems[k].nodeName) { case "id" : { messageID = statusItems[k].firstChild.nodeValue; break; } case "text" : { text = statusItems[k].firstChild.nodeValue; break; } case "created_at" : { createdAt = statusItems[k].firstChild.nodeValue; break; } case "user" : { var userItems = statusItems[k].childNodes; for (var l=0;l<userItems.length;l++) {

You have to track mouse events: button presses, button releases, and pointer movements. You also need to have a timer for growing and shrinking the circles over time. Finally, you have to take care of the repainting and give the Qt layout classes a size hint (all can be seen in the class declaration in Listing 7-13). Looking at the class declaration, you can group together the contents: The basic necessities: Here you find the constructor and sizeHint. Painting: The paintEvent method uses the variables x, y, r, and color for keeping track of what to draw. Mouse interaction: The mouse s events are caught using mousePressEvent, mouseMoveEvent, and mouseReleaseEvent. The last known mouse position is kept in mx and my. Timing: The QTimer object pointed to by timer is connected to the timeout slot. It updates x, y, r, and color depending on the mx and my values.

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