![]() It inserts a fake press event with the composed character, using keycode 0.Į.g. It tells the application which events to ignore (using XFilterEvent()). libX11 has a list of "compositions" which it uses for two things: This is handled by every application (again, transparently by libX11). There are two special state handling mechanisms that deviate from the above description: left and right shift both have the same effect. Multiple keycodes are required so that e.g. Each bit in the state is called a modifier and is toggled by one or more keycodes. Keyboard state is administered by the X11 server and has its own mapping table to determine how it is composed. As an example the "4" key on the keyboard maps to the symbols "4", "¤" and "$" depending on the current state. Which keysym to use from this set depends on the current keyboard "state", which is also provided by the server. The primary mapping is from a keycode to a set of keysyms. The mapping is stored in the X11 server though and the applications are notified whenever it changes. Translation from keycodes to keysyms is done through a a mapping table and is performed in every application (in libX11 though, so it's fairly transparent). This is what all well behaved applications should look at. These represent the symbols and they are more heavily standardised. This level corresponds to the first input model of keyboards. Since they are undefined, applications should make no assumptions on which key they represent. These map to physical buttons in an undefined manner that is controlled by whatever driver interfaces with the physical keyboard. Next is how the keyboards are seen from applications.Īt the core of X11 is keycodes. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |