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KDE (K Desktop Environment) is organized on a C++ object model with C++ objects containing functions with which you can modify the object. Many of the functions are inherited from higher-level KDE classes, while others are defined for a particular type of object. In a KDE program, you define an object and then use its public and private functions to modify it. For example, you can create a menu object and then use the menu object's functions to add new menu items to it. KDE uses the Qt Toolkit which is developed by Troll Tech (http://www.troll.no). It is this toolkit that is actually used to display and manage GUI objects such as buttons and windows. The Qt Toolkit operates much like the GTK+ Toolkit in Gnome. Because KDE applications are C++ object-oriented programs, they use a set of hierarchical object classes contained in the KDE and Qt libraries. Classes lower in the hierarchy will inherit members (functions) from predefined KDE classes higher in the hierarchy, and you can create your own classes and have them inherit members. KDE uses the Qt Toolkit and currently relies on it directly. Unlike Gnome, which can have its lower-level functions managed by any toolkit, KDE relies solely on the Qt Toolkit. Currently, KDE programming is essentially Qt programming. KDE and Qt programming rely on an extensive set of classes, each of which usually has a significant number of member functions that manage objects of that class. There are far more than can be listed within the size limitations of this book. For a complete listing of the KDE user interface classes, consult the documentation provided on the KDE developer's site, developer.kde.org. This site includes detailed tutorials, and complete reference materials for the KDE API as well as KOM (KDE Object Manager) documentation and Qt reference material. Each class is described in detail, and class type declarations, including their member function declarations and definitions, are given. In addition, consult the KDE and Qt header files. The .h files contain a complete listing of the KDE and Qt classes, along with detailed comments describing their member functions. A widget, like a window or a button, is just an object. You can define a window object using a KDE or Qt window class or a button using a KDE or Qt button class. There are several kinds of classes that you can use, depending on the type of window or button you want. To create a complex widget, such as a window that contains other widgets (perhaps toolbars and menus), you would define the subwidgets as children of the main widget. When you define a toolbar, you specify a particular window object as its parent. A subwidget can, in turn, have its own subwidgets, its own children. For example, a menu bar can have a window as its parent and individual menus as its children. When you declare a C++ object, you usually include arguments in addition to the class and object name. These arguments are passed to a special function called a constructor that is executed when the object is defined, which performs any needed setup or initialization operations for the object.
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For widgets, one of these arguments is usually the address of its parent widget. For example, a toolbar will be defined with one of its arguments being the address of a window object that is its parent. If the widget is a top-level object with no parent, the argument is NULL. With a series of simple object definitions, you can easily create a complex widget.
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A KDE program is simply a C++ program that uses objects whose classes are defined in the KDE and Qt libraries. You use the g++ compiler on your source code files as you would any other C++ program. g++ is the C++ form of the gcc C compiler. There are several KDE libraries, each with an extensive set of classes. Most programs will need at least the kdecore and kdeui libraries. Kdeui holds the KDE user interface classes for KDE widgets (see Table 7). Table 7: Common: KDE Kdeui (User Interface) Description A base class that provides basic functionality needed by nearly all dialog boxes The KDE Panel Applet class The class that provides active raise/lower buttons A container widget for buttons A Qt QCursor wrapper allowing "themed" cursors A dialog box with extended modeless support A widget for interactive font selection A gradient selector widget A floatable menu bar An easy MessageBox dialog box A different type of Check button A pop-up menu with a title A progress-indicator widget A standard horizontal or vertical separator A KDE status bar widget An internal class for use in KStatusBar An internal class for use in KStatusBar A KDE top-level main window A floatable toolbar with auto-resize A toolbar button A toolbar item An old KDE top-level window
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Widget DialogBase KApplet KButton KButtonBox KCursor KDialog KFontChooser KGradientSelector KMenuBar KMessageBox KNumCheckButton KPopupMenu KProgress KSeparator KStatusBar KStatusBarItem KStatusBarLabel KTMainWindow KToolBar KToolBarButton KToolBarItem KTopLevelWidget
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