201 lines
4.3 KiB
C
201 lines
4.3 KiB
C
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/*
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* This is a simple example of "scrolling" form with ncurses.
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* It use "page" to allow forms with more fields than your window can print.
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*
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* It prints a "label" (inactive field) and a regular field and let you
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* "scroll" pages of the form.
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*
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* How to compile:
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* gcc -o test scrolling_form.c -lform -lncurses
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*/
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#include <ncurses/form.h> // this includes <ncurses.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <assert.h>
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WINDOW *wbody, *inner;
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FIELD **field;
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FORM *form;
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int nb_field; // how many fields you want (modify it in main())
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int cur_y = 1, cur_x = 1; // current y and x for the inner window
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char str_label[7], str_field[6];
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char cur_ch_label = 'A', cur_ch_field = 'a';
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int lines = 21, cur_page = 0;
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/*
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+----------------------------------+ <-- wbody
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|+--------------------------------+ <-- inner
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|| ^ ||
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|| | lines ||
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|| v ||
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|+--------------------------------+|
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+----------------------------------+
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*/
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// We free everything here
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void quit() {
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int i;
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unpost_form(form);
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for (i = 0; i < nb_field; i++) {
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free(field_buffer(field[i], 0));
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free_field(field[i]);
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}
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free_form(form);
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delwin(wbody);
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delwin(inner);
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}
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char* get_next_str_field() {
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int i;
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if (str_field[0] != '\0')
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cur_ch_field++;
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for (i = 0; i < 4; i++)
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str_field[i] = cur_ch_field;
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str_field[5] = '\0';
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return str_field;
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}
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char* get_next_str_label() {
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int i;
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if (str_label[0] != '\0')
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cur_ch_label++;
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for (i = 0; i < 5; i++)
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str_label[i] = cur_ch_label;
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str_label[5] = ':';
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str_label[6] = '\0';
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return str_label;
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}
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/*
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* Create nb_field fields, one as a label, one as an active field e.g.:
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* [label]: [field]
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*/
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void create_nb_fields() {
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int i;
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field = calloc(nb_field, sizeof(FIELD *));
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if (!field) // No memory for you !
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assert(1);
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for (i = 0; i < nb_field-1; i++, cur_y += 2) {
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// label
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field[i] = new_field(1, 20, cur_y, cur_x, 0, 0);
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field_opts_on(field[i], O_VISIBLE);
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field_opts_off(field[i], O_EDIT);
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field_opts_off(field[i], O_ACTIVE);
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set_field_buffer(field[i], 0, get_next_str_label());
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i++;
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/*
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* This is a nasty tric:
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* I check if we wrote at the tail of the inner window,
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* if so, I move the field where it belongs (head of
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* the inner window).
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*/
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if (cur_y % lines == 0) {
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cur_y = 1;
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set_new_page(field[i-1], TRUE);
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move_field(field[i-1], cur_y, cur_x);
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}
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// field
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field[i] = new_field(1, 20, cur_y, cur_x + 10, 0, 0);
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set_field_back(field[i], A_UNDERLINE);
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field_opts_on(field[i], O_VISIBLE);
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field_opts_on(field[i], O_ACTIVE);
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field_opts_off(field[i], O_EDIT);
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set_field_buffer(field[i], 0, get_next_str_field());
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}
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field[nb_field-1] = NULL;
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}
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int main() {
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int ch;
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initscr();
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cbreak();
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noecho();
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keypad(stdscr, TRUE);
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// This is required to init get_next_str_XXXX
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str_label[0] = '\0';
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str_field[0] = '\0';
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wbody = newwin(lines + 2, 44, 1, 1);
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box(wbody, 0, 0);
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keypad(wbody, TRUE);
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nb_field = 43; // this is too much fields for the window
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create_nb_fields();
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form = new_form(field);
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// Check the doc here:
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// http://www.tldp.org/HOWTO/NCURSES-Programming-HOWTO/forms.html#FORMWINDOWS
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set_form_win(form, wbody);
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inner = derwin(wbody, lines, 42, 1 ,1);
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set_form_sub(form, inner);
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post_form(form);
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mvprintw(LINES - 4, 0, "Use F1 to quit");
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mvprintw(LINES - 3, 0, "Use PAGE_UP, PAGE_DOWN to switch between pages");
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mvprintw(LINES - 2, 0, "Use UP, DOWN arrow keys to switch between fields");
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refresh();
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while ((ch = wgetch(wbody)) != KEY_F(1)) {
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switch (ch) {
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case KEY_DOWN:
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form_driver(form, REQ_NEXT_FIELD);
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form_driver(form, REQ_END_LINE);
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break;
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case KEY_UP:
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form_driver(form, REQ_PREV_FIELD);
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form_driver(form, REQ_END_LINE);
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break;
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/*
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* This is where you want to look to see how
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* to "scroll" to the next/previous page.
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*/
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case KEY_NPAGE:
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form_driver(form, REQ_NEXT_PAGE);
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set_form_page(form, ++cur_page);
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break;
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case KEY_PPAGE:
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form_driver(form, REQ_PREV_PAGE);
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set_form_page(form, --cur_page);
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break;
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}
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}
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quit();
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endwin();
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return 0;
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}
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