KDE 2/QT programming bible - download pdf or read online

By Arthur Griffith

ISBN-10: 0764546821

ISBN-13: 9780764546822

This all-in-one educational and reference exhibits starting to complex Linux programmers tips to construct graphical person interfaces for laptop functions that might run within the Windows-like okay computing device atmosphere (KDE). professional writer Arthur Griffith covers every little thing from basic home windows and menus to conversation containers and different complicated widgets. The CD-ROM comprises the newest model of KDE

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Extra info for KDE 2/QT programming bible

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Qc 11/13/00 14:09 Page 25 Chapter 2 ✦ Creating and Displaying a Window There is no real connection between the signal and the slot. A signal is broadcast whether or not any slots are listening — and there can be any number of slots listening for the signal. Also, a slot can be set to listen for any number of signals. o. h. The Q_OBJECT macro adds some method prototypes to the ClickCount class definition, and the MOC compiler generates bodies for the new methods. The result is that the repetitive (and thus error-prone) coding required for signals and slots is almost completely automated.

The call to resize() on line 31 is a request to make the entire widget shrink to 10 by 10 pixels. The widget is unable to comply with the request because of the minimum size of the rows and columns. Whenever a widget is instructed to resize itself and the new height or width is outside the bounds of its maximum or minimum, the requested value is ignored and the closest valid value is used — that is, either the maximum or the minimum. In this example, the widget is simply reduced to its minimum size.

Qc 11/20/00 15:41 Page 39 Chapter 3 ✦ Laying Out Widgets in a Window Note Although it is quite normal to include pointers for all of the widgets in the class definition, it is not always necessary. Once a widget has been configured for display, there is no need for your program to retain the pointer unless you are going to need it for some special situation. For example, if your program were to change the text of the label or add members to the list box, it would need access to their pointers. Personally, I like to include the widgets in the class as a form of documentation.

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KDE 2/QT programming bible by Arthur Griffith


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