From c55d99022e6a00036283df7ae4bce79fd00bf9f2 Mon Sep 17 00:00:00 2001
From: Antonio Scandurra <me@as-cii.com>
Date: Wed, 31 Mar 2021 16:25:21 +0200
Subject: [PATCH] Handle non-precise scroll events in `BufferElement`

Co-Authored-By: Nathan Sobo <nathan@zed.dev>
---
 zed/src/editor/buffer_element.rs | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/zed/src/editor/buffer_element.rs b/zed/src/editor/buffer_element.rs
index ae33a17028..c437b6b3eb 100644
--- a/zed/src/editor/buffer_element.rs
+++ b/zed/src/editor/buffer_element.rs
@@ -133,7 +133,7 @@ impl BufferElement {
     fn scroll(
         &self,
         position: Vector2F,
-        delta: Vector2F,
+        mut delta: Vector2F,
         precise: bool,
         layout: &mut LayoutState,
         paint: &mut PaintState,
@@ -143,15 +143,14 @@ impl BufferElement {
             return false;
         }
 
-        if !precise {
-            todo!("still need to handle non-precise scroll events from a mouse wheel");
-        }
-
         let view = self.view.as_ref(ctx.app);
         let font_cache = &ctx.font_cache;
         let layout_cache = &ctx.text_layout_cache;
         let max_glyph_width = view.em_width(font_cache);
         let line_height = view.line_height(font_cache);
+        if !precise {
+            delta *= vec2f(max_glyph_width, line_height);
+        }
 
         let x = (view.scroll_position().x() * max_glyph_width - delta.x()) / max_glyph_width;
         let y = (view.scroll_position().y() * line_height - delta.y()) / line_height;