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crates/egui/src/containers/scroll_area.rs

@@ -809,20 +809,20 @@ impl Prepared {
                 .frame_state_mut(|state| state.scroll_target[d].take());
 
             if scroll_enabled[d] {
-                let update = if let Some((target_range, align, animation)) = scroll_target {
+                let update = if let Some(target) = scroll_target {
                     let min = content_ui.min_rect().min[d];
                     let clip_rect = content_ui.clip_rect();
                     let visible_range = min..=min + clip_rect.size()[d];
-                    let (start, end) = (target_range.min, target_range.max);
+                    let (start, end) = (target.range.min, target.range.max);
                     let clip_start = clip_rect.min[d];
                     let clip_end = clip_rect.max[d];
                     let mut spacing = ui.spacing().item_spacing[d];
 
-                    let delta = if let Some(align) = align {
+                    let delta = if let Some(align) = target.align {
                         let center_factor = align.to_factor();
 
                         let offset =
-                            lerp(target_range, center_factor) - lerp(visible_range, center_factor);
+                            lerp(target.range, center_factor) - lerp(visible_range, center_factor);
 
                         // Depending on the alignment we need to add or subtract the spacing
                         spacing *= remap(center_factor, 0.0..=1.0, -1.0..=1.0);
@@ -859,7 +859,7 @@ impl Prepared {
                         // The further we scroll, the more time we take.
                         let now = ui.input(|i| i.time);
                         let animation_duration = (delta.abs() / animation.points_per_second)
-                            .clamp(animation.min_duration, animation.max_duration);
+                            .clamp(animation.duration.min, animation.duration.max);
                         state.offset_target[d] = Some(ScrollTarget {
                             animation_time_span: (now, now + animation_duration as f64),
                             target_offset,

crates/egui/src/frame_state.rs

@@ -40,6 +40,23 @@ pub struct PerLayerState {
     pub widget_with_tooltip: Option<Id>,
 }
 
+#[derive(Clone, Debug)]
+pub struct ScrollTarget {
+    pub range: Rangef,
+    pub align: Option<Align>,
+    pub animation: style::ScrollAnimation,
+}
+
+impl ScrollTarget {
+    pub fn new(range: Rangef, align: Option<Align>, animation: style::ScrollAnimation) -> Self {
+        Self {
+            range,
+            align,
+            animation,
+        }
+    }
+}
+
 #[cfg(feature = "accesskit")]
 #[derive(Clone)]
 pub struct AccessKitFrameState {
@@ -79,7 +96,7 @@ pub struct FrameState {
     pub used_by_panels: Rect,
 
     /// The current scroll area should scroll to this range (horizontal, vertical).
-    pub scroll_target: [Option<(Rangef, Option<Align>, style::ScrollAnimation)>; 2],
+    pub scroll_target: [Option<ScrollTarget>; 2],
 
     /// The current scroll area should scroll by this much.
     ///
@@ -153,7 +170,7 @@ impl FrameState {
         *unused_rect = screen_rect;
         *used_by_panels = Rect::NOTHING;
         *scroll_target = [None, None];
-        *scroll_delta = (Vec2::default(), style::ScrollAnimation::none());
+        *scroll_delta = Default::default();
 
         #[cfg(debug_assertions)]
         {

crates/egui/src/response.rs

@@ -2,10 +2,9 @@ use std::{any::Any, sync::Arc};
 
 use crate::{
     emath::{Align, Pos2, Rect, Vec2},
-    menu, AreaState, Context, CursorIcon, Id, LayerId, Order, PointerButton, Sense, Ui, WidgetRect,
-    WidgetText,
+    frame_state, menu, AreaState, Context, CursorIcon, Id, LayerId, Order, PointerButton, Sense,
+    Ui, WidgetRect, WidgetText,
 };
-
 // ----------------------------------------------------------------------------
 
 /// The result of adding a widget to a [`Ui`].
@@ -855,8 +854,16 @@ impl Response {
         animation: crate::style::ScrollAnimation,
     ) {
         self.ctx.frame_state_mut(|state| {
-            state.scroll_target[0] = Some((self.rect.x_range(), align, animation));
-            state.scroll_target[1] = Some((self.rect.y_range(), align, animation));
+            state.scroll_target[0] = Some(frame_state::ScrollTarget::new(
+                self.rect.x_range(),
+                align,
+                animation,
+            ));
+            state.scroll_target[1] = Some(frame_state::ScrollTarget::new(
+                self.rect.y_range(),
+                align,
+                animation,
+            ));
         });
     }
 

crates/egui/src/style.rs

@@ -695,39 +695,50 @@ impl ScrollStyle {
 
 // ----------------------------------------------------------------------------
 
-#[derive(Copy, Clone, Debug, PartialEq, PartialOrd)]
+/// Scroll animation configuration, used when programatically scrolling somewhere (e.g. with `[crate::Ui::scroll_to_cursor]`)
+/// The animation duration is calculated based on the distance to be scrolled via `[ScrollAnimation::points_per_second]`
+/// and can be clamped to a min / max duration via `[ScrollAnimation::duration]`.
+#[derive(Copy, Clone, Debug, PartialEq)]
 #[cfg_attr(feature = "serde", derive(serde::Deserialize, serde::Serialize))]
 #[cfg_attr(feature = "serde", serde(default))]
 pub struct ScrollAnimation {
+    /// With what speed should we scroll? (Default: 1000.0)
     pub points_per_second: f32,
-    pub min_duration: f32,
-    pub max_duration: f32,
+    /// The min / max scroll duration.
+    pub duration: Rangef,
 }
 
 impl Default for ScrollAnimation {
     fn default() -> Self {
         Self {
             points_per_second: 1000.0,
-            min_duration: 0.1,
-            max_duration: 0.3,
+            duration: Rangef::new(0.1, 0.3),
         }
     }
 }
 
 impl ScrollAnimation {
+    /// New scroll animation
+    pub fn new(points_per_second: f32, duration: Rangef) -> Self {
+        Self {
+            points_per_second,
+            duration,
+        }
+    }
+
+    /// No animation, scroll instantly.
     pub fn none() -> Self {
         Self {
-            points_per_second: 0.0,
-            min_duration: 0.0,
-            max_duration: 0.0,
+            points_per_second: f32::INFINITY,
+            duration: Rangef::new(0.0, 0.0),
         }
     }
 
+    /// Scroll with a fixed duration, regardless of distance.
     pub fn duration(t: f32) -> Self {
         Self {
-            points_per_second: 0.0,
-            min_duration: t,
-            max_duration: t,
+            points_per_second: f32::INFINITY,
+            duration: Rangef::new(t, t),
         }
     }
 
@@ -744,16 +755,16 @@ impl ScrollAnimation {
 
             ui.label("Min duration:");
             ui.add(
-                DragValue::new(&mut self.min_duration)
+                DragValue::new(&mut self.duration.min)
                     .speed(0.01)
-                    .range(0.0..=self.max_duration),
+                    .range(0.0..=self.duration.max),
             );
             ui.label("seconds");
             ui.end_row();
 
             ui.label("Max duration:");
             ui.add(
-                DragValue::new(&mut self.max_duration)
+                DragValue::new(&mut self.duration.max)
                     .speed(0.01)
                     .range(0.0..=1.0),
             );

crates/egui/src/ui.rs

@@ -9,7 +9,6 @@ use crate::{
     containers::*, ecolor::*, epaint::text::Fonts, layout::*, menu::MenuState, placer::Placer,
     util::IdTypeMap, widgets::*, *,
 };
-
 // ----------------------------------------------------------------------------
 
 /// This is what you use to place widgets.
@@ -1227,8 +1226,10 @@ impl Ui {
     ) {
         for d in 0..2 {
             let range = Rangef::new(rect.min[d], rect.max[d]);
-            self.ctx()
-                .frame_state_mut(|state| state.scroll_target[d] = Some((range, align, animation)));
+            self.ctx().frame_state_mut(|state| {
+                state.scroll_target[d] =
+                    Some(frame_state::ScrollTarget::new(range, align, animation))
+            });
         }
     }
 
@@ -1267,8 +1268,10 @@ impl Ui {
         let target = self.next_widget_position();
         for d in 0..2 {
             let target = Rangef::point(target[d]);
-            self.ctx()
-                .frame_state_mut(|state| state.scroll_target[d] = Some((target, align, animation)));
+            self.ctx().frame_state_mut(|state| {
+                state.scroll_target[d] =
+                    Some(frame_state::ScrollTarget::new(target, align, animation))
+            });
         }
     }