menuconfig:inputbox: support navigate input position

This patch add support navigate input position *inside* the input
field with LEFT/RIGHT, so it is possible to modify the text in place.

Signed-off-by: Wang YanQing <udknight@gmail.com>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

diff --git a/scripts/kconfig/lxdialog/inputbox.c b/scripts/kconfig/lxdialog/inputbox.c
index dd8e587c50e26eada18fe35995aaa0ec301f42fc..21404a04d7c34dc37d9f29ffe804b6abeb3f2a62 100644 (file)
--- a/scripts/kconfig/lxdialog/inputbox.c
+++ b/scripts/kconfig/lxdialog/inputbox.c
@@ -45,7 +45,8 @@ int dialog_inputbox(const char *title, const char *prompt, int height, int width
                     const char *init)
 {
        int i, x, y, box_y, box_x, box_width;
-       int input_x = 0, scroll = 0, key = 0, button = -1;
+       int input_x = 0, key = 0, button = -1;
+       int show_x, len, pos;
        char *instr = dialog_input_result;
        WINDOW *dialog;
 
@@ -97,14 +98,17 @@ do_resize:
        wmove(dialog, box_y, box_x);
        wattrset(dialog, dlg.inputbox.atr);
 
-       input_x = strlen(instr);
+       len = strlen(instr);
+       pos = len;
 
-       if (input_x >= box_width) {
-               scroll = input_x - box_width + 1;
+       if (len >= box_width) {
+               show_x = len - box_width + 1;
                input_x = box_width - 1;
                for (i = 0; i < box_width - 1; i++)
-                       waddch(dialog, instr[scroll + i]);
+                       waddch(dialog, instr[show_x + i]);
        } else {
+               show_x = 0;
+               input_x = len;
                waddstr(dialog, instr);
        }
 
@@ -121,45 +125,104 @@ do_resize:
                        case KEY_UP:
                        case KEY_DOWN:
                                break;
-                       case KEY_LEFT:
-                               continue;
-                       case KEY_RIGHT:
-                               continue;
                        case KEY_BACKSPACE:
                        case 127:
-                               if (input_x || scroll) {
+                               if (pos) {
                                        wattrset(dialog, dlg.inputbox.atr);
-                                       if (!input_x) {
-                                               scroll = scroll < box_width - 1 ? 0 : scroll - (box_width - 1);
-                                               wmove(dialog, box_y, box_x);
-                                               for (i = 0; i < box_width; i++)
-                                                       waddch(dialog,
-                                                              instr[scroll + input_x + i] ?
-                                                              instr[scroll + input_x + i] : ' ');
-                                               input_x = strlen(instr) - scroll;
+                                       if (input_x == 0) {
+                                               show_x--;
                                        } else
                                                input_x--;
-                                       instr[scroll + input_x] = '\0';
-                                       mvwaddch(dialog, box_y, input_x + box_x, ' ');
+
+                                       if (pos < len) {
+                                               for (i = pos - 1; i < len; i++) {
+                                                       instr[i] = instr[i+1];
+                                               }
+                                       }
+
+                                       pos--;
+                                       len--;
+                                       instr[len] = '\0';
+                                       wmove(dialog, box_y, box_x);
+                                       for (i = 0; i < box_width; i++) {
+                                               if (!instr[show_x + i]) {
+                                                       waddch(dialog, ' ');
+                                                       break;
+                                               }
+                                               waddch(dialog, instr[show_x + i]);
+                                       }
                                        wmove(dialog, box_y, input_x + box_x);
                                        wrefresh(dialog);
                                }
                                continue;
+                       case KEY_LEFT:
+                               if (pos > 0) {
+                                       if (input_x > 0) {
+                                               wmove(dialog, box_y, --input_x + box_x);
+                                       } else if (input_x == 0) {
+                                               show_x--;
+                                               wmove(dialog, box_y, box_x);
+                                               for (i = 0; i < box_width; i++) {
+                                                       if (!instr[show_x + i]) {
+                                                               waddch(dialog, ' ');
+                                                               break;
+                                                       }
+                                                       waddch(dialog, instr[show_x + i]);
+                                               }
+                                               wmove(dialog, box_y, box_x);
+                                       }
+                                       pos--;
+                               }
+                               continue;
+                       case KEY_RIGHT:
+                               if (pos < len) {
+                                       if (input_x < box_width - 1) {
+                                               wmove(dialog, box_y, ++input_x + box_x);
+                                       } else if (input_x == box_width - 1) {
+                                               show_x++;
+                                               wmove(dialog, box_y, box_x);
+                                               for (i = 0; i < box_width; i++) {
+                                                       if (!instr[show_x + i]) {
+                                                               waddch(dialog, ' ');
+                                                               break;
+                                                       }
+                                                       waddch(dialog, instr[show_x + i]);
+                                               }
+                                               wmove(dialog, box_y, input_x + box_x);
+                                       }
+                                       pos++;
+                               }
+                               continue;
                        default:
                                if (key < 0x100 && isprint(key)) {
-                                       if (scroll + input_x < MAX_LEN) {
+                                       if (len < MAX_LEN) {
                                                wattrset(dialog, dlg.inputbox.atr);
-                                               instr[scroll + input_x] = key;
-                                               instr[scroll + input_x + 1] = '\0';
+                                               if (pos < len) {
+                                                       for (i = len; i > pos; i--)
+                                                               instr[i] = instr[i-1];
+                                                       instr[pos] = key;
+                                               } else {
+                                                       instr[len] = key;
+                                               }
+                                               pos++;
+                                               len++;
+                                               instr[len] = '\0';
+
                                                if (input_x == box_width - 1) {
-                                                       scroll++;
-                                                       wmove(dialog, box_y, box_x);
-                                                       for (i = 0; i < box_width - 1; i++)
-                                                               waddch(dialog, instr [scroll + i]);
+                                                       show_x++;
                                                } else {
-                                                       wmove(dialog, box_y, input_x++ + box_x);
-                                                       waddch(dialog, key);
+                                                       input_x++;
+                                               }
+
+                                               wmove(dialog, box_y, box_x);
+                                               for (i = 0; i < box_width; i++) {
+                                                       if (!instr[show_x + i]) {
+                                                               waddch(dialog, ' ');
+                                                               break;
+                                                       }
+                                                       waddch(dialog, instr[show_x + i]);
                                                }
+                                               wmove(dialog, box_y, input_x + box_x);
                                                wrefresh(dialog);
                                        } else
                                                flash();        /* Alarm user about overflow */