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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.

The program will continue to run when you swap between the Terminal and the Editor Screen; it will not stop The button causes the screen area to be printed on the default printer The screen area is printed as a graphic Only what is visible on the screen will be printed, any output that has scrolled off the screen will not be printed, but see below for how to retrieve any text that has scrolled off the screen The button will turn on the debugging feature See the Debug command in Sec C7 The buttons and facilitate the use of a special feature of the Terminal Screen that can be a powerful tool Text printed with the Print command is stored in a buffer, regardless of whether it has scrolled off the screen or not.

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.

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.

Once the buffer is full (it holds 8 kb of text) it will clear and start to ll again If this occurs in the middle of your output the buffer will only be holding part of the output when you use the button The buffer content can be sent to the Windows clipboard using the button Once you have done this, the text in the clipboard can be used in any Windows program The button is used to clear the buffer and the Windows clipboard at the same time This is needed if you do not want any output from previous program runs to be included when you copy the buffer to the clipboard Remember to clear the buffer between runs if you desire, but before you start the run..

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.

You do not have to check the fingerprint to have GPG operate. This is just an advisable precaution you can perform on your own. The point is that you need to be confident that the key you received is valid. Normally you can accept most keys from public servers or known sites like Red Hat as valid, although it is easy to check their posted fingerprints. Once assured