Corrected vertical scroll hint counting.

[plomrogue] / windows.c

diff --git a/windows.c b/windows.c
index cf64b4e11fb0da2db2271929fde9b3de51f2466c..099eff58c0626861ac4419f47756c610f8beccaf 100644 (file)
--- a/windows.c
+++ b/windows.c
@@ -18,8 +18,8 @@ struct WinMeta init_win_meta (WINDOW * screen) {
   return win_meta; }
 
 void scroll_pad (struct WinMeta * win_meta, char dir) {
-// Scroll pad left (if possible) or right.
-  if      ('+' == dir)
+// Scroll pad left or right (if possible).
+  if      ('+' == dir && win_meta->pad_offset + win_meta->width < getmaxx(win_meta->pad) - 1)
     win_meta->pad_offset++;
   else if ('-' == dir && win_meta->pad_offset > 0)
     win_meta->pad_offset--; }
@@ -171,8 +171,25 @@ void draw_windows (struct Win * win) {
   if (0 != win->next) {
     draw_windows (win->next); } }
 
+void draw_vertical_scroll_hint (struct WinMeta * win_meta, uint16_t x, uint32_t more_cols, char dir) {
+// Draw scroll hint line in win at col x of pad display, announce more_cols more columns in direction dir.
+  uint16_t y, offset;
+  offset = 0;
+  char phrase[] = "more columns";
+  char * scrolldesc = malloc((3 * sizeof(char)) + strlen(phrase) + 10); // 10 = max chars for uint32_t string
+  sprintf(scrolldesc, " %d %s ", more_cols, phrase);
+  offset = 1;
+  if (win_meta->height > (strlen(scrolldesc) + 1))
+    offset = (win_meta->height - strlen(scrolldesc)) / 2;
+  for (y = 0; y < win_meta->height; y++)
+    if (y >= offset && y < strlen(scrolldesc) + offset)
+      mvwaddch(win_meta->pad, y, x, scrolldesc[y - offset] | A_REVERSE);
+    else
+      mvwaddch(win_meta->pad, y, x, dir | A_REVERSE);
+  free(scrolldesc); }
+
 void draw_all_windows (struct WinMeta * win_meta) {
-// Draw all windows and their borders.
+// Draw pad with all windows and their borders, plus scrolling hints.
   erase();
   wnoutrefresh(win_meta->screen);
   werase(win_meta->pad);
@@ -191,8 +208,15 @@ void draw_all_windows (struct WinMeta * win_meta) {
       mvwaddch(win_meta->pad, all_corners[i].tr.y, all_corners[i].tr.x, '+');
       mvwaddch(win_meta->pad, all_corners[i].bl.y, all_corners[i].bl.x, '+');
       mvwaddch(win_meta->pad, all_corners[i].br.y, all_corners[i].br.x, '+'); }
-    pnoutrefresh(win_meta->pad, 0, win_meta->pad_offset, 0, 0, win_meta->height, win_meta->width - 1);
-    free(all_corners); }
+    free(all_corners);
+    uint16_t y;
+    if (win_meta->pad_offset > 0)
+        draw_vertical_scroll_hint(win_meta, win_meta->pad_offset, win_meta->pad_offset + 1, '<');
+    if (win_meta->pad_offset + win_meta->width < getmaxx(win_meta->pad) - 1)
+      for (y = 0; y < win_meta->height; y++)
+        draw_vertical_scroll_hint(win_meta, win_meta->pad_offset + win_meta->width - 1,
+                                  getmaxx(win_meta->pad) - (win_meta->pad_offset + win_meta->width), '>');
+    pnoutrefresh(win_meta->pad, 0, win_meta->pad_offset, 0, 0, win_meta->height, win_meta->width - 1); }
   doupdate(); }
 
 void resize_active_window (struct WinMeta * win_meta, uint16_t height, uint16_t width) {