ncmenu: nextsection/prevsection

include/notcurses.h

@@ -2242,6 +2242,16 @@ API int ncmenu_unroll(struct ncmenu* n, int sectionidx);
 // Roll up any unrolled menu section, and hide the menu if using hiding.
 API int ncmenu_rollup(struct ncmenu* n);
 
+// Unroll the previous/next section (relative to current unrolled). If no
+// section is unrolled, the first section will be unrolled.
+API int ncmenu_nextsection(struct ncmenu* n);
+API int ncmenu_prevsection(struct ncmenu* n);
+
+// Move to the previous/next item within the currently unrolled section. If no
+// section is unrolled, the first section will be unrolled.
+API int ncmenu_nextitem(struct ncmenu* n);
+API int ncmenu_previtem(struct ncmenu* n);
+
 // Destroy a menu created with ncmenu_create().
 API int ncmenu_destroy(struct ncmenu* n);
 

src/lib/menu.c

@@ -240,6 +240,40 @@ int ncmenu_rollup(ncmenu* n){
   return write_header(n);
 }
 
+int ncmenu_nextsection(ncmenu* n){
+  int nextsection = n->unrolledsection + 1;
+  if(nextsection){
+    ncmenu_rollup(n);
+    if(nextsection == n->sectioncount){
+      nextsection = 0;
+    }
+  }
+  return ncmenu_unroll(n, nextsection);
+}
+
+int ncmenu_prevsection(ncmenu* n){
+  int prevsection = n->unrolledsection;
+  if(n->unrolledsection < 0){
+    prevsection = 1;
+  }else{
+    ncmenu_rollup(n);
+  }
+  if(--prevsection == -1){
+    prevsection = n->sectioncount - 1;
+  }
+  return ncmenu_unroll(n, prevsection);
+}
+
+int ncmenu_nextitem(ncmenu* n){
+  // FIXME
+  return 0;
+}
+
+int ncmenu_previtem(ncmenu* n){
+  // FIXME
+  return 0;
+}
+
 int ncmenu_destroy(ncmenu* n){
   int ret = 0;
   if(n){

src/poc/menu.c

@@ -10,7 +10,19 @@ run_menu(struct notcurses* nc, struct ncmenu* ncm){
   ncinput ni;
   notcurses_render(nc);
   while((keypress = notcurses_getc_blocking(nc, &ni)) != (char32_t)-1){
-    if(ni.alt){
+    if(keypress == NCKEY_LEFT){
+      if(ncmenu_prevsection(ncm)){
+        return -1;
+      }
+    }else if(keypress == NCKEY_RIGHT){
+      if(ncmenu_nextsection(ncm)){
+        return -1;
+      }
+    }else if(keypress == '\x1b'){
+      if(ncmenu_unroll(ncm, 1)){
+        return -1;
+      }
+    }else if(ni.alt){
       switch(keypress){
         case 'd': case 'D':
           if(ncmenu_unroll(ncm, 0)){
@@ -23,8 +35,7 @@ run_menu(struct notcurses* nc, struct ncmenu* ncm){
           }
           break;
       }
-    }
-    if(keypress == 'q'){
+    }else if(keypress == 'q'){
       ncmenu_destroy(ncm);
       return 0;
     }