Adds, replaces, or deletes an entry in an event table
| Call | ||
| #include <vv_sys.h> | ||
| EVENTFP et_rplevnt(eventcode, event_fp, etp) | ||
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USHORT eventcode |
Event code to add to or modify in an event table |
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| EVENTFP event_fp | Pointer to event function to install in an event table | |
| ETPTR etp | Pointer to the event table to modify | |
| Description of Parameters
etp: Specify a pointer to an event table. The Vermont Views event tables are as follows: |
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| CLETP | Choice list event table | |
| FLDETP | Field event table | |
| FMETP | Form event table | |
| DRAGETP | Draw and drag event table | |
| HELPETP | Help event table | |
| MEMOETP | Memo event table | |
| MNETP | Menu event table | |
| PUSHETP | Pushbutton event table | |
| RADIOETP | Radio button event table | |
| SRETP | Scrollable region event table | |
| SYSETP | System event table | |
| TTMEMOETP | Tickertape memo event table | |
| VIEWETP | Viewing event table | |
| LBOXETP | List box event table | |
| Returns | ||
| POINTER | The pointer to the event function previously associated with this event code | |
| NULLFP | One of the following has occurred: (1) the event code passed is 0, (2) the event table pointer passed was NULLP, or (3) no function was previously associated with this event code. In the development libraries, NULLFP may signify that there is no empty entry to place the event code-event function combination. In this case, VV_ERR is set to FULLTABLE | |
| Description
If the event code is 0 or the event table pointer is NULLP, et_rplevnt() immediately returns NULLFP. If the passed parameters are not NULL, et_rplevnt() searches the event table for the specified event code. If the event code is found and the specified function pointer is not NULLFP, the old function pointer is replaced. The old event function pointer is returned. If the event code is found and the specified event function pointer is NULLFP, the entry in the event table is cleared. The old event function pointer is returned. If the event code is not found and the specified event function pointer is not NULLFP, the event code and its associated event function are placed in one of the empty entries in the table. |
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| Related Functions | ||
