From 5b77a15fdfa2658de740a6f1c943aed50f5612f8 Mon Sep 17 00:00:00 2001
From: antonin 31 <antonin.klopp-tosser@grenoble-inp.org>
Date: Sun, 7 Oct 2018 13:10:41 +0200
Subject: [PATCH] Added boundaries for scrolling

---
 src/edit_view.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/edit_view.rs b/src/edit_view.rs
index b75e51e..c598608 100644
--- a/src/edit_view.rs
+++ b/src/edit_view.rs
@@ -370,8 +370,14 @@ impl EditView {
     }
 
     fn constrain_scroll(&mut self) {
-        let max_scroll = TOP_PAD + LINE_SPACE *
-            (self.line_cache.height().saturating_sub(1)) as f32;
+        let mut max_scroll = TOP_PAD + (LINE_SPACE *
+            (self.line_cache.height().saturating_sub(1)) as f32) - self.size.1 + LINE_SPACE;
+
+        // Not allowing to scroll if the text is smaller than the window size
+        if (LINE_SPACE * self.line_cache.height().saturating_sub(1) as f32) < self.size.1 {
+            max_scroll = 0 as f32;
+        }
+
         if self.scroll_offset < 0.0 {
             self.scroll_offset = 0.0;
         } else if self.scroll_offset > max_scroll {