vis: improve cursor positioning after scrolling

Make cursor placement after scrolling (half) pages up/down less arbitrary.

Close #390, fix #391

1 files changed, 4 insertions, 0 deletions

diff --git a/view.h b/view.h
index 8cd2ce3..07fedf4 100644
--- a/view.h
+++ b/view.h
@@ -73,6 +73,10 @@ size_t view_slide_down(View*, int lines);
  * visible line, try to preserve the column position */
 size_t view_scroll_up(View*, int lines);
 size_t view_scroll_down(View*, int lines);
+size_t view_scroll_page_up(View*);
+size_t view_scroll_page_down(View*);
+size_t view_scroll_halfpage_up(View*);
+size_t view_scroll_halfpage_down(View*);
 /* place the cursor at the start ot the n-th window line, counting from 1 */
 size_t view_screenline_goto(View*, int n);