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KDevelop is an integrated development environment (IDE) for writing K Desktop programs (see www.kdevelop.org). You can access KDevelop from the Development entry in the K Desktop menu. When KDevelop first opens, it displays a window with two toolbars, a status bar, and three subwindows (see Figure 8). The bottom window displays debugging information. The left window will display the different C++ classes and source code files defined for your project. The right window holds three tabbed panes: one for header files, one for your source code files, and the other for KDevelop documentation.
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Figure 8: KDevelop Note KDevelop and Qt Designer are not included with the Publisher's Edition. You will need to download them from the Red Hat FTP site. To start a project you select New from the Project menu. This will start up the Application Wizard, shown in Figure 9, that helps you set up the kind of application you want to create. For example, you could create a KDE panel applet, a Konqueror browser plug-in, or a standard KDE Desktop interface.
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Figure 9: KDevelop Application Wizard Click the Next button to move to the next window in the Wizard. Here, you specify the project name and its directory, along with the kind of support files you will need, such as those for documentation (see Figure 10). KDevelop will create a directory with the same name as the projects. Within that directory, it will create a further subdirectory with the same name, which will hold the source code files. The source code files for the myhello project would be in the myhello/myhello directory.
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Figure 10: KDevelop project specifications On the next screen you can choose to use the CVS versioning system, to help keep track of changes and enable many users to work on the same project. Then, templates for standard headings in the source and header files are presented. On the Process screen, you click the Create button to have KDevelop generate any needed files and create an initial main.c source code file with required K Desktop functions and classes defined, as well as links to the needed KDE libraries. Click the Exit key when finished. For a standard KDE application, KDevelop will automatically generate the code for an application window, standard menus including File, Edit, and Help menus, a standard icon bar, and a status bar. This initial code will be placed in the source code file of the same name for example, myhello.cpp. You can then add in your own classes with their own function calls and have them invoked from entries you can add to these menus or to the toolbar. You could code your program as you would any C++ program. However, KDevelop also includes the Qt Designer that you can use to automatically create your KDE windows and widgets. Once you have created your project, you can then start up Qt Designer by selecting the Dialog Editor entry in the View window. This opens a separate Qt Designer window, with toolbars for different KDE widgets (see Figure 11). A subwindow in the main pane is the Property Editor, which will display properties for any selected widget you have created.
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Figure 11: Qt Designer To create a window, either click on the New icon in the toolbar or select New from the File menu. A window will be displayed on the right side of the main pane. To the left will be the window's Property Editor. Here, you can specify the class name of the window, along with its caption, size, and color, and so on. In Figure 11, the class name is hwin and the caption is My Hello. When you save the window and its widgets, you need to save them in the directory for the source code used for your project. To add a widget to your window, click on the widget in the toolbar and then click on where you want to place it on the window, and drag to set the size of the widget. The widget will appear. The Property Editor will automatically display the properties for the selected widget. For example, to create a button, click the Button icon and then click in your window. You can then change the text displayed for the button in its Property Editor window. Figure 11 shows both a label and a button widget added to the hwin window. The button has had its display text changed to "Click Me". Widgets, like buttons, need to be connected to slots for them to have any effect. The slot is the function that will activate when a specified event occurs on that button. To set up an event/slot connection for a widget, you need to select the Connect Signal/Slots entry in the Tools menu, or click on the Connect Signal/Slots button in the second toolbar. Then, click on the widget. This opens a window where you can select the event and the slot to be associated with it. Once you have created your windows and widgets with the Qt Designer, you then need to integrate them into your project as source code. When you exit the Qt Designer, KDevelop will set up the necessary instructions in your project's Makefile to do this. Qt Designer actually saves its code in special .ui files that need to be converted to C++ code to be used. KDevelop sets up this process for you. However, you still need to integrate the KDE windows and widgets into your program. When you created your main window in Qt Designer, you gave it a class name. The example in Figure 11 used hwin as the class name for the main
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window. You have to integrate this class name into the overall class structure of your KDE C++ program. You do this by creating a new class in your program that will inherit from the class you created with the Qt Designer. This way, all those windows and widget classes that contain the code to create and manage those widgets are inherited automatically into your program and can be referenced by the new class you created. To create a new class, select New Class from the Projects menu. This opens a window where you can specify the name of the new class and any class it inherits from. In Figure 12, a new class called myhellowin is created that will inherit from the hwin class, its base class. Through the myhellowin class, the program can access the window and widgets created for the hwin class. Click "Generate a QWidget Childclass" since the classes are derived from the parent QWidget class. Whenever you create a new class, KDevelop generates a corresponding header file for it (.h). If the class inherits from another class, KDevelop will generate an include statement to include the header file for that class. For example, when the myhellowin class is created, a myhellowin.h file is generated for it. Since that class inherits from the hwin class, an include statement in inserted in myhellowin.h that will include the hwin.h file. The hwin.h file is automatically generated by KDevelop using the hwin.ui file created with Qt Designer.
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Figure 12: New class in KDevelop Once you have coded your program, you can build and run it by clicking on the Run icon. You can also elect to just build the project or compile selected files. Tip You can manually generate source code from a Qt Designer .ui file using the uic tool. Redirect the output to the appropriate .h file for example, uic myhello.ui > myhello.h.
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