From 4a28a3b182ffafc311982098fd0669e1154fa90b Mon Sep 17 00:00:00 2001
From: "Michael D. Lowis" <mike.lowis@gentex.com>
Date: Thu, 19 Apr 2018 12:57:01 -0400
Subject: [PATCH] implemented first pass at scroll up and down. Still broken
 for wrapped lines

---
 lib/config.c |  4 ++--
 lib/view.c   |  7 +++++++
 lib/x11.c    | 10 ++++++++--
 3 files changed, 17 insertions(+), 4 deletions(-)

diff --git a/lib/config.c b/lib/config.c
index 4d21dec..1681afa 100644
--- a/lib/config.c
+++ b/lib/config.c
@@ -8,7 +8,7 @@
     #define FONT "Verdana:size=10"
     #define LNSPACE 0
 #else
-    #define FONT "Liberation Mono:size=11"
+    #define FONT "Verdana:size=11"
     #define LNSPACE 1
 #endif
 
@@ -22,7 +22,7 @@ int /* Integer config options */
     LineSpacing = LNSPACE,
     Timeout = 50,
     TabWidth = 4,
-    ScrollBy = 4,
+    ScrollBy = 1,
     ClickTime = 500,
     MaxScanDist = 0,
     Syntax = ON,
diff --git a/lib/view.c b/lib/view.c
index c7b043e..00d210e 100644
--- a/lib/view.c
+++ b/lib/view.c
@@ -285,6 +285,10 @@ char* view_getctx(View* view) {
 }
 
 static void scroll_up(View* view) {
+    if (view->index > 0)
+        view->index--;
+    else if (view->rows[0]->off > 0)
+        resize(view, view->width, view->nrows, (view->rows[0]->off - 1));
 }
 
 static void scroll_dn(View* view) {
@@ -295,6 +299,9 @@ static void scroll_dn(View* view) {
     } else {
         view->index++;
     }
+
+    printf("%ld <= %ld\n", view->nvisible, (view->nrows - view->index));
+    assert(view->nvisible <= (view->nrows - view->index));
 }
 
 void view_scroll(View* view, int move) {
diff --git a/lib/x11.c b/lib/x11.c
index 535dcdf..6de77f5 100644
--- a/lib/x11.c
+++ b/lib/x11.c
@@ -246,8 +246,14 @@ static void mouse_click(int btn, bool pressed, int x, int y) {
         case MouseLeft:    mouse_left(Focused, pressed, row, col);    break;
         case MouseMiddle:  mouse_middle(Focused, pressed, row, col);  break;
         case MouseRight:   mouse_right(Focused, pressed, row, col);   break;
-        case MouseWheelUp: view_scroll(win_view(Focused), -ScrollBy); break;
-        case MouseWheelDn: view_scroll(win_view(Focused), +ScrollBy); break;
+        case MouseWheelUp:
+            if (!pressed) return;
+            view_scroll(win_view(Focused), -ScrollBy);
+            break;
+        case MouseWheelDn:
+            if (!pressed) return;
+            view_scroll(win_view(Focused), +ScrollBy);
+            break;
     }
 }
 
-- 
2.49.0