form_driver(3X) form_driver(3X) NAME form_driver - command-processing loop of the form system SYNOPSIS #include <form.h> int form_driver(FORM *form, int c); DESCRIPTION Once a form has been posted (displayed), you should funnel input events to it through form_driver. This routine has three major input cases: o The input is a form navigation request. Navigation request codes are constants defined in <form.h>, which are distinct from the key- and character codes returned by wgetch. o The input is a printable character. Printable characters (which must be positive, less than 256) are checked according to the program's locale settings. o The input is the KEY_MOUSE special key associated with an mouse event. The form driver requests are as follows: REQ_NEXT_PAGE Move to the next page. REQ_PREV_PAGE Move to the previous page. REQ_FIRST_PAGE Move to the first page. REQ_LAST_PAGE Move to the last field. REQ_NEXT_FIELD Move to the next field. REQ_PREV_FIELD Move to the previous field. REQ_FIRST_FIELD Move to the first field. REQ_LAST_FIELD Move to the last field. REQ_SNEXT_FIELD Move to the sorted next field. REQ_SPREV_FIELD Move to the sorted previous field. REQ_SFIRST_FIELD Move to the sorted first field. REQ_SLAST_FIELD Move to the sorted last field. REQ_LEFT_FIELD Move left to a field. REQ_RIGHT_FIELD Move right to a field. REQ_UP_FIELD Move up to a field. REQ_DOWN_FIELD Move down to a field. REQ_NEXT_CHAR Move to the next char. REQ_PREV_CHAR Move to the previous char. REQ_NEXT_LINE Move to the next line. REQ_PREV_LINE Move to the previous line. REQ_NEXT_WORD Move to the next word. REQ_PREV_WORD Move to the previous word. REQ_BEG_FIELD Move to the beginning of the field. REQ_END_FIELD Move to the end of the field. REQ_BEG_LINE Move to the beginning of the line. REQ_END_LINE Move to the end of the line. REQ_LEFT_CHAR Move left in the field. REQ_RIGHT_CHAR Move right in the field. REQ_UP_CHAR Move up in the field. REQ_DOWN_CHAR Move down in the field. REQ_NEW_LINE Insert or overlay a new line. REQ_INS_CHAR Insert a blank at the cursor. REQ_INS_LINE Insert a blank line at the cursor. REQ_DEL_CHAR Delete character at the cursor. REQ_DEL_PREV Delete character before the cursor. REQ_DEL_LINE Delete line at the cursor. REQ_DEL_WORD Delete blank-delimited word at the cursor. REQ_CLR_EOL Clear to end of line from cursor. REQ_CLR_EOF Clear to end of field from cursor. REQ_CLR_FIELD Clear the entire field. REQ_OVL_MODE Enter overlay mode. REQ_INS_MODE Enter insert mode. REQ_SCR_FLINE Scroll the field forward a line. REQ_SCR_BLINE Scroll the field backward a line. REQ_SCR_FPAGE Scroll the field forward a page. REQ_SCR_BPAGE Scroll the field backward a page. REQ_SCR_FHPAGE Scroll the field forward half a page. REQ_SCR_BHPAGE Scroll the field backward half a page. REQ_SCR_FCHAR Scroll the field forward a character. REQ_SCR_BCHAR Scroll the field backward a character. REQ_SCR_HFLINE Horizontal scroll the field forward a line. REQ_SCR_HBLINE Horizontal scroll the field backward a line. REQ_SCR_HFHALF Horizontal scroll the field forward half a line. REQ_SCR_HBHALF Horizontal scroll the field backward half a line. REQ_VALIDATION Validate field. REQ_NEXT_CHOICE Display next field choice. REQ_PREV_CHOICE Display previous field choice. If the second argument is a printable character, the driver places it in the current posi- tion in the current field. If it is one of the forms requests listed above, that request is executed. MOUSE HANDLING If the second argument is the KEY_MOUSE special key, the associated mouse event is trans- lated into one of the above pre-defined requests. Currently only clicks in the user win- dow (e.g., inside the form display area or the decoration window) are handled. If you click above the display region of the form: a REQ_PREV_FIELD is generated for a single click, a REQ_PREV_PAGE is generated for a double-click and a REQ_FIRST_FIELD is generated for a triple-click. If you click below the display region of the form: a REQ_NEXT_FIELD is generated for a single click, a REQ_NEXT_PAGE is generated for a double-click and a REQ_LAST_FIELD is generated for a triple-click. If you click at an field inside the display area of the form: o the form cursor is positioned to that field. o If you double-click a field, the form cursor is positioned to that field and E_UNKNOWN_COMMAND is returned. This return value makes sense, because a double click usually means that an field-specific action should be returned. It is exactly the purpose of this return value to signal that an application specific command should be executed. o If a translation into a request was done, form_driver returns the result of this request. If you clicked outside the user window or the mouse event could not be translated into a form request an E_REQUEST_DENIED is returned. APPLICATION-DEFINED COMMANDS If the second argument is neither printable nor one of the above pre-defined form requests, the driver assumes it is an application-specific command and returns E_UNKNOWN_COMMAND. Application-defined commands should be defined relative to MAX_COM- MAND, the maximum value of these pre-defined requests. RETURN VALUE form_driver returns one of the following error codes: E_OK The routine succeeded. E_BAD_ARGUMENT Routine detected an incorrect or out-of-range argument. E_BAD_STATE Routine was called from an initialization or termination function. E_NOT_POSTED The form has not been posted. E_INVALID_FIELD Contents of field is invalid. E_REQUEST_DENIED The form driver could not process the request. E_SYSTEM_ERROR System error occurred (see errno). E_UNKNOWN_COMMAND The form driver code saw an unknown request code. SEE ALSO curses(3X), form(3X), form_variables(3X), getch(3X). NOTES The header file <form.h> automatically includes the header files <curses.h>. PORTABILITY These routines emulate the System V forms library. They were not supported on Version 7 or BSD versions. AUTHORS Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S. Raymond. form_driver(3X)
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