menuconfig: Extend dialog_textbox so that it can return to a scrolled position

We can now display other UI elements (menus) "on top" of a textbox and then
seemingly come back to it in the same state it was left.

Signed-off-by: Benjamin Poirier <bpoirier@suse.de>
Signed-off-by: Michal Marek <mmarek@suse.cz>

3 files changed, 28 insertions, 6 deletions

diff --git a/scripts/kconfig/lxdialog/dialog.h b/scripts/kconfig/lxdialog/dialog.h
index 35ca0286d105..2a01cdfae5a8 100644
--- a/scripts/kconfig/lxdialog/dialog.h
+++ b/scripts/kconfig/lxdialog/dialog.h
@@ -211,7 +211,7 @@ int dialog_yesno(const char *title, const char *prompt, int height, int width);
 int dialog_msgbox(const char *title, const char *prompt, int height,
                   int width, int pause);
 int dialog_textbox(const char *title, const char *file, int height, int width,
-                   int *keys);
+                   int *keys, int *_vscroll, int *_hscroll);
 int dialog_menu(const char *title, const char *prompt,
                 const void *selected, int *s_scroll);
 int dialog_checklist(const char *title, const char *prompt, int height,
diff --git a/scripts/kconfig/lxdialog/textbox.c b/scripts/kconfig/lxdialog/textbox.c
index eb4ee92ad2b3..506a095c387c 100644
--- a/scripts/kconfig/lxdialog/textbox.c
+++ b/scripts/kconfig/lxdialog/textbox.c
@@ -51,7 +51,7 @@ static void refresh_text_box(WINDOW *dialog, WINDOW *box, int boxh, int boxw,
  * keys is a null-terminated array
  */
 int dialog_textbox(const char *title, const char *tbuf, int initial_height,
-                   int initial_width, int *keys)
+                   int initial_width, int *keys, int *_vscroll, int *_hscroll)
 {
         int i, x, y, cur_x, cur_y, key = 0;
         int height, width, boxh, boxw;
@@ -65,6 +65,15 @@ int dialog_textbox(const char *title, const char *tbuf, int initial_height,
         buf = tbuf;
         page = buf;     /* page is pointer to start of page to be displayed */
 
+        if (_vscroll && *_vscroll) {
+                begin_reached = 0;
+
+                for (i = 0; i < *_vscroll; i++)
+                        get_line();
+        }
+        if (_hscroll)
+                hscroll = *_hscroll;
+
 do_resize:
         getmaxyx(stdscr, height, width);
         if (height < 8 || width < 8)
@@ -275,6 +284,19 @@ do_resize:
         }
         delwin(box);
         delwin(dialog);
+        if (_vscroll) {
+                const char *s;
+
+                s = buf;
+                *_vscroll = 0;
+                back_lines(page_length);
+                while (s < page && (s = strchr(s, '\n'))) {
+                        (*_vscroll)++;
+                        s++;
+                }
+        }
+        if (_hscroll)
+                *_hscroll = hscroll;
         return key;
 }
 
diff --git a/scripts/kconfig/mconf.c b/scripts/kconfig/mconf.c
index e097efb9c3ef..b3a37c2b16ae 100644
--- a/scripts/kconfig/mconf.c
+++ b/scripts/kconfig/mconf.c
@@ -280,7 +280,7 @@ static void conf_string(struct menu *menu);
 static void conf_load(void);
 static void conf_save(void);
 static int show_textbox_ext(const char *title, const char *text, int r, int c,
-                            int *keys);
+                            int *keys, int *vscroll, int *hscroll);
 static void show_textbox(const char *title, const char *text, int r, int c);
 static void show_helptext(const char *title, const char *text);
 static void show_help(struct menu *menu);
@@ -621,15 +621,15 @@ static void conf(struct menu *menu)
 }
 
 static int show_textbox_ext(const char *title, const char *text, int r, int c,
-                            int *keys)
+                            int *keys, int *vscroll, int *hscroll)
 {
         dialog_clear();
-        return dialog_textbox(title, text, r, c, keys);
+        return dialog_textbox(title, text, r, c, keys, vscroll, hscroll);
 }
 
 static void show_textbox(const char *title, const char *text, int r, int c)
 {
-        show_textbox_ext(title, text, r, c, (int []) {0});
+        show_textbox_ext(title, text, r, c, (int []) {0}, NULL, NULL);
 }
 
 static void show_helptext(const char *title, const char *text)