From f5e528c90b1011a40943b20084e827651381e5c7 Mon Sep 17 00:00:00 2001
From: veksha <veksho@gmail.com>
Date: Mon, 13 Jul 2026 14:21:08 +0300
Subject: [PATCH] Added mouse_scroll_lines option

---
 config/ratty.toml | 1 +
 src/config.rs     | 3 +++
 src/mouse.rs      | 8 +++++++-
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/config/ratty.toml b/config/ratty.toml
index d2f42b6..a624622 100644
--- a/config/ratty.toml
+++ b/config/ratty.toml
@@ -8,6 +8,7 @@ opacity = 0.8
 default_cols = 104
 default_rows = 32
 scrollback = 2000
+mouse_scroll_lines = 3
 
 # [shell]
 # program = "/bin/bash" 
diff --git a/src/config.rs b/src/config.rs
index 92280ea..050cfc3 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -159,6 +159,8 @@ pub struct TerminalConfig {
     pub default_rows: u16,
     /// Scrollback line count.
     pub scrollback: usize,
+    /// Number of lines scrolled per mouse wheel tick in flat 2D mode.
+    pub mouse_scroll_lines: usize,
 }
 
 impl Default for TerminalConfig {
@@ -167,6 +169,7 @@ impl Default for TerminalConfig {
             default_cols: 104,
             default_rows: 32,
             scrollback: 2_000,
+            mouse_scroll_lines: 3,
         }
     }
 }
diff --git a/src/mouse.rs b/src/mouse.rs
index 7701e94..42caaba 100644
--- a/src/mouse.rs
+++ b/src/mouse.rs
@@ -8,6 +8,7 @@ use bevy::prelude::*;
 use bevy::window::{CursorMoved, PrimaryWindow, Window};
 use vt100::{MouseProtocolEncoding, MouseProtocolMode};
 
+use crate::config::AppConfig;
 use crate::runtime::TerminalRuntime;
 use crate::scene::{
     MobiusTransition, TerminalPlaneView, TerminalPresentation, TerminalPresentationMode,
@@ -245,6 +246,7 @@ pub struct MouseSystemParams<'w, 's> {
     plane_view: ResMut<'w, TerminalPlaneView>,
     selection: ResMut<'w, TerminalSelection>,
     redraw: ResMut<'w, crate::terminal::TerminalRedrawState>,
+    app_config: Res<'w, AppConfig>,
 }
 
 /// Handles terminal mouse input.
@@ -266,6 +268,7 @@ pub(crate) fn handle_mouse_input(
         plane_view,
         selection,
         redraw,
+        app_config,
     } = &mut params;
     let Ok((primary_window, window)) = primary_window.single() else {
         return;
@@ -507,7 +510,10 @@ pub(crate) fn handle_mouse_input(
             && !runtime.parser.screen().alternate_screen()
         {
             let amount = match event.unit {
-                MouseScrollUnit::Line => event.y.round() as isize,
+                MouseScrollUnit::Line => {
+                    app_config.terminal.mouse_scroll_lines as isize
+                        * (if delta < 0.0 { -1 } else { 1 })
+                }
                 MouseScrollUnit::Pixel => {
                     let char_height = terminal.char_dimensions().y;
                     local_scroll.pixel_remainder += event.y / char_height;