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| 56 | >Chapter 3. Linux Trace Toolkit Viewer Graphical Module Tutorial</TD |
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| 77 | >3.2. The static part of a module</A |
| 78 | ></H1 |
| 79 | ><P |
| 80 | > A module must have a static part to be able to get loaded just like a text |
| 81 | module. Now, let's see the differences. The graphical module depends on the |
| 82 | "lttvwindow" module. See module.c from the control flow viewer for an example. |
| 83 | </P |
| 84 | ><P |
| 85 | > The init() and destroy() functions must register functions that can be called by |
| 86 | user interaction to instanciate the viewers. That's the goal of |
| 87 | lttvwindow_register_constructor() and lttvwindow_unregister_constructor() : |
| 88 | they register a function with a menu entry and an icon. The main window will |
| 89 | shown them in its interface and call the function when the button or menu item |
| 90 | is selected. This hook function must receive a pointer to a "Tab" object in |
| 91 | parameter. |
| 92 | </P |
| 93 | ><P |
| 94 | > Also note the presence of the destroy_walk() method. It is called when the |
| 95 | module is unloaded : it must destroy all the instances of the viewers from the |
| 96 | module. |
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