KDE Programming Bible103 by Arthur Griffith

By Arthur Griffith

This all-in-one educational and reference exhibits starting to complex Linux programmers easy methods to construct graphical person interfaces for machine functions that may run within the Windows-like ok machine surroundings (KDE). professional writer Arthur Griffith covers every thing from uncomplicated home windows and menus to conversation packing containers and different complex widgets. The CD-ROM includes the newest model of KDE.

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The next chapter deals with displaying pop-up windows and dialog boxes. There are some pre-defined KDE and Qt dialog boxes, but you can also create your own. qc 11/20/00 15:41 Page 27 3 C H A P T E R Laying Out Widgets in a Window T his chapter is all about controlling the size and position of a collection of widgets inside a window. Before an application can be programmed to respond to a button or read some text typed by the user, it is necessary to present the button and the text entry widgets in some sort of reasonable arrangement.

No maximum is set, so each row and column can be increased to any size, and if you resize this window, you will notice the buttons being resized also. There is more about this stretching in the next example. 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.

The parent window — in this case, the QApplication window — assumes the task of displaying the label, but will only do so if there has been a call to the label’s show() method. Another function, named hide(), can be used to cause a widget to disappear from the display. The call to setMainWidget() on line 11 inserts the label into the main window. To keep this example simple, the QLabel object is used, but normally the widget will be some sort of compound widget that contains the collection of widgets, text, and other elements of the main window of an application.

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