Add settings to configure the scroll speed (#2120)

Feature requested here: https://github.com/lapce/lapce/issues/2085

Signed-off-by: Hanif Ariffin <hanif.ariffin.4326@gmail.com>

defaults/settings.toml

@@ -47,6 +47,7 @@ atomic-soft-tabs = false
 double-click = false
 move-focus-while-search = true
 diff-context-lines=3
+scroll-speed-modifier=1
 
 [terminal]
 font-family = ""

lapce-data/src/config.rs

@@ -475,6 +475,10 @@ pub struct EditorConfig {
         desc = "Set the default number of visible lines above and below the diff block (-1 for infinite)"
     )]
     pub diff_context_lines: i32,
+    #[field_names(
+        desc = "Scroll speed modifier. The scroll delta will be multiplied by whatever the value is povided here. Defaults to 1."
+    )]
+    pub scroll_speed_modifier: f64,
 }
 
 impl EditorConfig {

lapce-ui/src/scroll.rs

@@ -742,11 +742,13 @@ pub fn handle_scroll(
         port: &mut Viewport,
         ctx: &mut EventCtx,
         event: &Event,
+        config: &LapceConfig,
         env: &Env,
     ) {
         if !ctx.is_handled() {
             if let Event::Wheel(mouse) = event {
-                let mut delta = mouse.wheel_delta.round();
+                let mut delta =
+                    mouse.wheel_delta.round() * config.editor.scroll_speed_modifier;
                 if self.vertical_scroll_for_horizontal && delta.x == 0.0 {
                     delta.x = delta.y;
                 }
@@ -898,7 +900,7 @@ fn event(&mut self, ctx: &mut EventCtx, event: &Event, data: &mut T, env: &Env)
         }
 
         self.clip.with_port(|port| {
-            scroll_component.handle_scroll(port, ctx, event, env);
+            scroll_component.handle_scroll(port, ctx, event, data.get_config(), env);
         });
 
         match event {