By Arthur Griffith
This all-in-one educational and reference indicates starting to complicated Linux programmers tips on how to construct graphical person interfaces for laptop functions that might run within the Windows-like ok machine surroundings (KDE). specialist writer Arthur Griffith covers every thing from easy home windows and menus to conversation packing containers and different complex widgets. The CD-ROM includes the most recent model of KDE.
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Additional info for KDE Programming Bible103
Example text
Lines 10, 11, and 12 create a button with the label “(1,1)” and place it on the grid square at location (1,1). The call to setMaximumSize() on line 11 allows the button to expand to fill its containing cell. The sizeHint() method is valid for many, but not all, widgets. In this case, it is correctly assumed that the QPushButton widget returns a valid size hint, so no validity test is made before it is used. qc 34 11/20/00 15:41 Page 34 Part I ✦ Getting Started This way, if the widget being tested does not return a valid size setting, something reasonable will be used.
Line 30 adds a stretch point with a stretch factor of 30 below button three, and lines 32 through 36 insert button four below that. As shown in Figure 3-8, when the layout is at its minimum size, no space is added by the stretch factor between buttons three and four. However, when the window is stretched vertically, some space appears between the two buttons. Below button four, line 38 inserts a 5-pixel space and a stretch factor of 10. Then lines 41 through 45 create and insert button five below that.
Geometric Widget Placement You can specify the exact placement and size of each widget by specifying four values: horizontal offset, vertical offset, width, and height. The coordinate system is that of the parent window — that is, the window that contains the widgets. The following example places three pushbuttons on an application window. exec()); } The mainline is quite simple. The header file is included on line 3. The widget with the buttons is created on line 8, and is specified as the widget to be displayed as the main application window by the call to setMainWidget() on line 10.