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When working with QMainWindow, Qt s class that represents your application s main window, you should be aware of three methods that help you manage this organization of your application s user interface. The first two are the centralWidget and setCentralWidget methods. They let you get the currently established central widget and set it to a new widget. Your central widget can be and often is a single widget, such as a QListView or QWebView. If you need a more complicated layout, you can use a composite widget with layouts. Here s where Qt Creator really shines, because you can use it (simply right-click the project Add New Qt Qt Designer Form) to create a new composite widget as your application s central widget. Once you do this, in your code you just create an instance of this widget, and then set it as the central widget for the main window. The final method to be aware of is menuBar, which returns an instance of the Qt menu bar that hosts the options menu. Historically from the desktop, this menu bar would have multiple menus (e.g., File, Edit. and so forth), but on Nokia s mobile platforms, these menus are collapsed into the single options menu. You ll add actions to the menu bar that represent user actions, such as switching from one view to another.

The following exercises will help you to better understand the topics covered in this chapter. The answers are presented in Appendix D. 1. 2. 3. 4. Produce an overview of all course offerings. Provide the course code, begin date, course duration, and name of the trainer. Provide an overview, in two columns, showing the names of all employees who ever attended an SQL course, with the name of the trainer. For all employees, list their name, initials, and yearly salary (including bonus and commission). For all course offerings, list the course code, begin date, and number of registrations. Sort your results on the number of registrations, from high to low. List the course code, begin date, and number of registrations for all course offerings in 1999 with at least three registrations. Provide the employee numbers of all employees who ever taught a course as a trainer, but never attended a course as an attendee. Which employees attended a specific course more than once For all trainers, provide their name and initials, the number of courses they taught, the total number of students they had in their classes, and the average evaluation rating. Round the evaluation ratings to one decimal. List the name and initials of all trainers who ever had their own manager as a student in a general course (category GEN).

Binding to code In truth, all the examples thus far have demonstrated binding to code a simple variable read is, after all, code. The bind keyword merely attaches an expression (any unit of code that produces a result) to a read-only variable. This section looks a little deeper into how to exploit this functionality. For example, what if we need some logic to control how a bound variable gets updated That s the first question we ll answer, using listing 2.33.

$WINDOWS.~BT This folder contains the minimal copy of Windows Vista that manages the actual work of setting up the new operating system and migrating files and settings. $UPGRADE.~OS Setup gathers settings for the operating system and stores them in this temporary folder to be applied to Windows Vista after installation is complete.

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You need to write a control that will be used across multiple pages. This control should contain updated sales figures. The control should update itself at various intervals if a containing page is left open. Which controls should you use to enable this scenario (Choose all that apply.)

In this chapter, I ll describe how to properly implement the operations that all objects must exhibit. Specifically, I ll talk about object equality, identity, hash codes, and cloning.

The computer used with the companion CD-ROM should also have the following software:

The procedure opens a transaction just for the sake of creating a save point called S1. It inserts a new row to Sequence, which generates a new identity value in the table and stores it in the @val output parameter. The procedure then rolls back the INSERT. But a rollback doesn t undo a variable assignment, nor does it undo incrementing the identity value. Plus, the identity resource is not locked for the duration of an outer transaction; rather, it s locked only for a fraction of a second to increment. This behavior of the IDENTITY property is crucial for maintaining a nonblocking sequence.