From 101e1fa2e2e02857a095cd13916ad35ac60b1318 Mon Sep 17 00:00:00 2001
From: Laurent MAZET <laurent.mazet@thalesgroup.com>
Date: Tue, 8 Oct 2024 14:44:35 +0200
Subject: [PATCH] support prev and next page keys

---
 ndisplay.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/ndisplay.c b/ndisplay.c
index ac41fd2..614e363 100644
--- a/ndisplay.c
+++ b/ndisplay.c
@@ -285,6 +285,32 @@ int main (int argc, char *argv[])
                 change = 1;
             }
             break;
+        case KEY_PPAGE:
+        case 'I':
+            if (ycursor > 0) {
+                ycursor = max (0, ycursor - LINES / 2);
+                change = 1;
+            }
+            break;
+        case 'J':
+            if (xcursor > 0) {
+                xcursor = max (0, xcursor - COLS / 2);
+                change = 1;
+            }
+            break;
+        case KEY_NPAGE:
+        case 'K':
+            if (images[scale]->height - ycursor > LINES) {
+                ycursor = min (ycursor + LINES / 2, images[scale]->height - LINES);
+                change = 1;
+            }
+            break;
+        case 'L':
+            if (images[scale]->width - xcursor > COLS / mode) {
+                xcursor = min (xcursor + COLS / 2, images[scale]->width - COLS);
+                change = 1;
+            }
+            break;
         }
     }
 
-- 
2.30.2