Progress bars, repeating animations

Closes #70

examples/animation.rs

@@ -3,12 +3,13 @@ use std::time::Duration;
 use gooey::animation::{AnimationHandle, AnimationTarget, IntoAnimate, Spawn};
 use gooey::value::Dynamic;
 use gooey::widget::MakeWidget;
+use gooey::widgets::progress::Progressable;
 use gooey::{Run, WithClone};
+use kludgine::figures::units::Lp;
 
 fn main() -> gooey::Result {
     let animation = Dynamic::new(AnimationHandle::new());
     let value = Dynamic::new(50);
-    let label = value.map_each(|value| value.to_string());
 
     // Gooey's animation system supports using a `Duration` as a step in
     // animation to create a delay. This can also be used to call a function
@@ -20,7 +21,13 @@ fn main() -> gooey::Result {
     "To 0"
         .into_button()
         .on_click(animate_to(&animation, &value, 0))
-        .and(label)
+        .and(
+            value
+                .clone()
+                .progress_bar_to(100)
+                .width(Lp::inches(3))
+                .centered(),
+        )
         .and(
             "To 100"
                 .into_button()

src/animation.rs

@@ -171,6 +171,7 @@ pub trait Animate: Send + Sync {
 }
 
 /// A pending transition for a [`Dynamic`] to a new value.
+#[derive(Clone)]
 pub struct DynamicTransition<T> {
     /// The dynamic value to change.
     pub dynamic: Dynamic<T>,
@@ -226,6 +227,7 @@ where
 /// [`Duration`], using the `Easing` generic parameter to control how the value
 /// is interpolated.
 #[must_use = "animations are not performed until they are spawned"]
+#[derive(Clone)]
 pub struct Animation<Target, Easing = Linear>
 where
     Target: AnimationTarget,
@@ -321,6 +323,22 @@ pub trait IntoAnimate: Sized + Send + Sync {
         Chain::new(self, other)
     }
 
+    /// Returns an animation that repeats `self` indefinitely.
+    fn cycle(self) -> Cycle<Self>
+    where
+        Self: Clone,
+    {
+        Cycle::forever(self)
+    }
+
+    /// Returns an animation that repeats a number of times before completing.
+    fn repeat(self, times: usize) -> Cycle<Self>
+    where
+        Self: Clone,
+    {
+        Cycle::n_times(times, self)
+    }
+
     /// Invokes `on_complete` after this animation finishes.
     fn on_complete<F>(self, on_complete: F) -> OnCompleteAnimation<Self>
     where
@@ -473,6 +491,7 @@ impl Drop for AnimationHandle {
 }
 
 /// An animation combinator that runs animation `A`, then animation `B`.
+#[derive(Clone)]
 pub struct Chain<A: IntoAnimate, B: IntoAnimate>(A, B);
 
 /// A [`Chain`] that is currently animating.
@@ -529,6 +548,90 @@ where
     }
 }
 
+/// An animation that repeats another animation.
+pub struct Cycle<A>
+where
+    A: IntoAnimate + Clone,
+{
+    cycles: Option<usize>,
+    animation: A,
+    running: Option<A::Animate>,
+}
+
+impl<A> Cycle<A>
+where
+    A: IntoAnimate + Clone,
+{
+    /// Returns a new animation that repeats `animation` an unlimited number of
+    /// times.
+    pub fn forever(animation: A) -> Self {
+        Self {
+            animation,
+            cycles: None,
+            running: None,
+        }
+    }
+
+    /// Returns a new animation that repeats `animation` a specific number of
+    /// times.
+    ///
+    /// Passing 1 as `cycles` is equivalent to executing the animation directly.
+    pub fn n_times(cycles: usize, animation: A) -> Self {
+        Self {
+            animation,
+            cycles: Some(cycles),
+            running: None,
+        }
+    }
+
+    fn keep_cycling(&mut self) -> bool {
+        match &mut self.cycles {
+            Some(0) => false,
+            Some(cycles) => {
+                *cycles -= 1;
+                true
+            }
+            None => true,
+        }
+    }
+}
+
+impl<A> IntoAnimate for Cycle<A>
+where
+    A: IntoAnimate + Clone,
+{
+    type Animate = Self;
+
+    fn into_animate(self) -> Self::Animate {
+        self
+    }
+}
+
+impl<A> Animate for Cycle<A>
+where
+    A: IntoAnimate + Clone,
+{
+    fn animate(&mut self, mut elapsed: Duration) -> ControlFlow<Duration> {
+        while !elapsed.is_zero() {
+            if let Some(running) = &mut self.running {
+                match running.animate(elapsed) {
+                    ControlFlow::Break(remaining) => elapsed = remaining,
+                    ControlFlow::Continue(()) => return ControlFlow::Continue(()),
+                }
+            }
+
+            if self.keep_cycling() {
+                self.running = Some(self.animation.clone().into_animate());
+            } else {
+                self.running = None;
+                return ControlFlow::Break(elapsed);
+            }
+        }
+
+        ControlFlow::Continue(())
+    }
+}
+
 /// An animation wrapper that invokes a callback upon the animation completing.
 ///
 /// This type guarantees the callback will only be invoked once per animation

src/value.rs

@@ -1201,6 +1201,16 @@ impl<T> Value<T> {
         }
     }
 }
+
+impl<T> IntoDynamic<T> for Value<T> {
+    fn into_dynamic(self) -> Dynamic<T> {
+        match self {
+            Value::Constant(value) => Dynamic::new(value),
+            Value::Dynamic(value) => value,
+        }
+    }
+}
+
 impl<T> Clone for Value<T>
 where
     T: Clone,

src/widgets.rs

@@ -6,10 +6,12 @@ mod canvas;
 pub mod checkbox;
 pub mod container;
 mod custom;
+mod data;
 mod expand;
 pub mod input;
 pub mod label;
 mod mode_switch;
+pub mod progress;
 mod resize;
 pub mod scroll;
 pub mod slider;
@@ -26,10 +28,12 @@ pub use canvas::Canvas;
 pub use checkbox::Checkbox;
 pub use container::Container;
 pub use custom::Custom;
+pub use data::Data;
 pub use expand::Expand;
 pub use input::Input;
 pub use label::Label;
 pub use mode_switch::ThemedMode;
+pub use progress::ProgressBar;
 pub use resize::Resize;
 pub use scroll::Scroll;
 pub use slider::Slider;

src/widgets/data.rs

@@ -0,0 +1,49 @@
+use std::fmt::Debug;
+use std::panic::UnwindSafe;
+
+use crate::widget::{MakeWidget, WidgetRef, WrapperWidget};
+use crate::widgets::Space;
+
+/// A widget that stores arbitrary data in the widget hierachy.
+///
+/// This widget is useful if data needs to live as long as a related widget. For
+/// example, [`ProgressBar`](crate::widgets::ProgressBar) is not a "real" widget
+/// -- it implements [`MakeWidget`] and returns a customized
+/// [`Slider`](crate::widgets::Slider). To ensure the indeterminant animation
+/// lives only as long as the created slider does, `ProgressBar` wraps the
+/// `Slider` in a `Data` widget to store the animation handle.
+#[derive(Debug)]
+pub struct Data<T> {
+    _data: T,
+    child: WidgetRef,
+}
+
+impl<T> Data<T> {
+    /// Returns an empty widget with the contained value.
+    pub fn new(value: T) -> Self {
+        Self::new_wrapping(value, Space::clear())
+    }
+
+    /// Returns a new instance that wraps `widget` and stores `value`.
+    pub fn new_wrapping(value: T, widget: impl MakeWidget) -> Self {
+        Self {
+            _data: value,
+            child: WidgetRef::new(widget),
+        }
+    }
+}
+
+impl<T> From<T> for Data<T> {
+    fn from(value: T) -> Self {
+        Self::new(value)
+    }
+}
+
+impl<T> WrapperWidget for Data<T>
+where
+    T: Debug + Send + UnwindSafe + 'static,
+{
+    fn child_mut(&mut self) -> &mut WidgetRef {
+        &mut self.child
+    }
+}

src/widgets/progress.rs

@@ -0,0 +1,185 @@
+//! Widgets for displaying progress indicators.
+
+use std::ops::RangeInclusive;
+use std::time::Duration;
+
+use kludgine::figures::Ranged;
+
+use crate::animation::easings::EaseInOutSine;
+use crate::animation::{
+    AnimationHandle, AnimationTarget, IntoAnimate, PercentBetween, Spawn, ZeroToOne,
+};
+use crate::value::{Dynamic, IntoDynamic, IntoValue, MapEach, Value};
+use crate::widget::{MakeWidget, WidgetInstance};
+use crate::widgets::slider::Slidable;
+use crate::widgets::Data;
+
+/// A bar-shaped progress indicator.
+#[derive(Debug)]
+pub struct ProgressBar {
+    progress: Value<Progress>,
+}
+
+impl ProgressBar {
+    /// Returns an indeterminant progress bar.
+    #[must_use]
+    pub const fn indeterminant() -> Self {
+        Self {
+            progress: Value::Constant(Progress::Indeterminant),
+        }
+    }
+
+    /// Returns a new progress bar that displays `progress`.
+    #[must_use]
+    pub fn new(progress: impl IntoDynamic<Progress>) -> Self {
+        Self {
+            progress: Value::Dynamic(progress.into_dynamic()),
+        }
+    }
+}
+
+/// A measurement of progress for an indicator widget like [`ProgressBar`].
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum Progress {
+    /// The task has an indeterminant length.
+    Indeterminant,
+    /// The task is a specified percent complete.
+    Percent(ZeroToOne),
+}
+
+impl MakeWidget for ProgressBar {
+    fn make_widget(self) -> WidgetInstance {
+        let start = Dynamic::new(ZeroToOne::ZERO);
+        let end = Dynamic::new(ZeroToOne::ZERO);
+        let value = (&start, &end).map_each(|(start, end)| *start..=*end);
+
+        let mut indeterminant_animation = None;
+        update_progress_bar(
+            self.progress.get(),
+            &mut indeterminant_animation,
+            &start,
+            &end,
+        );
+
+        let slider = value.slider().knobless().non_interactive();
+        match self.progress {
+            Value::Dynamic(progress) => {
+                progress.for_each(move |progress| {
+                    update_progress_bar(*progress, &mut indeterminant_animation, &start, &end);
+                });
+                Data::new_wrapping(progress, slider).make_widget()
+            }
+            Value::Constant(_) => Data::new_wrapping(indeterminant_animation, slider).make_widget(),
+        }
+    }
+}
+
+fn update_progress_bar(
+    progress: Progress,
+    indeterminant_animation: &mut Option<AnimationHandle>,
+    start: &Dynamic<ZeroToOne>,
+    end: &Dynamic<ZeroToOne>,
+) {
+    match progress {
+        Progress::Indeterminant => {
+            *indeterminant_animation = Some(
+                end.transition_to(ZeroToOne::new(0.66))
+                    .over(Duration::from_millis(500))
+                    .with_easing(EaseInOutSine)
+                    .and_then(
+                        start
+                            .transition_to(ZeroToOne::new(0.33))
+                            .over(Duration::from_millis(500))
+                            .with_easing(EaseInOutSine),
+                    )
+                    .and_then(
+                        end.transition_to(ZeroToOne::ONE)
+                            .over(Duration::from_millis(500))
+                            .with_easing(EaseInOutSine),
+                    )
+                    .and_then(
+                        start
+                            .transition_to(ZeroToOne::ONE)
+                            .over(Duration::from_millis(500))
+                            .with_easing(EaseInOutSine),
+                    )
+                    .and_then(
+                        (
+                            start.transition_to(ZeroToOne::ZERO),
+                            end.transition_to(ZeroToOne::ZERO),
+                        )
+                            .over(Duration::ZERO),
+                    )
+                    .cycle()
+                    .spawn(),
+            );
+        }
+        Progress::Percent(value) => {
+            let _stopped_animation = indeterminant_animation.take();
+            start.update(ZeroToOne::ZERO);
+            end.update(value);
+        }
+    }
+}
+
+/// A value that can be used in a progress indicator.
+pub trait Progressable<T>: IntoDynamic<T> + Sized {
+    /// Returns a new progress bar that displays progress from `T::MIN` to
+    /// `T::MAX`.
+    fn progress_bar(self) -> ProgressBar
+    where
+        T: Ranged + PercentBetween,
+    {
+        ProgressBar::new(
+            self.into_dynamic()
+                .map_each(|t| Progress::Percent(t.percent_between(&T::MIN, &T::MAX))),
+        )
+    }
+
+    /// Returns a new progress bar that displays progress from `T::MIN` to
+    /// `max`. The maximum value can be either a `T` or an `Option<T>`. If
+    /// `None` is the maximum value, an indeterminant progress bar will be
+    /// displayed.
+    fn progress_bar_to(self, max: impl IntoValue<Option<T>>) -> ProgressBar
+    where
+        T: Ranged + PercentBetween + Clone + Send + Sync + 'static,
+    {
+        let max = max.into_value();
+        match max {
+            Value::Constant(max) => self.progress_bar_between(max.map(|max| T::MIN..=max)),
+            Value::Dynamic(max) => {
+                self.progress_bar_between(max.map_each(|max| max.clone().map(|max| T::MIN..=max)))
+            }
+        }
+    }
+
+    /// Returns a new progress bar that displays progress over the specified
+    /// `range` of `T`. The range can be either a `T..=T` or an `Option<T>`. If
+    /// `None` is specified as the range, an indeterminant progress bar will be
+    /// displayed.
+    fn progress_bar_between<Range>(self, range: Range) -> ProgressBar
+    where
+        T: PercentBetween + Clone + Send + Sync + 'static,
+        Range: IntoValue<Option<RangeInclusive<T>>>,
+    {
+        let value = self.into_dynamic();
+        let range = range.into_value();
+        match range {
+            Value::Constant(range) => ProgressBar::new(value.map_each(move |value| {
+                range
+                    .as_ref()
+                    .map(|range| value.percent_between(range.start(), range.end()))
+                    .map_or(Progress::Indeterminant, Progress::Percent)
+            })),
+            Value::Dynamic(range) => {
+                ProgressBar::new((&range, &value).map_each(|(range, value)| {
+                    range.clone().map_or(Progress::Indeterminant, |range| {
+                        Progress::Percent(value.percent_between(range.start(), range.end()))
+                    })
+                }))
+            }
+        }
+    }
+}
+
+impl<U, T> Progressable<U> for T where T: IntoDynamic<U> {}

src/widgets/slider.rs

@@ -46,6 +46,8 @@ where
     ///
     /// This defaults to `0.05`/5%.
     pub step: Value<ZeroToOne>,
+    knob_visible: bool,
+    interactive: bool,
     knob_size: UPx,
     horizontal: bool,
     rendered_size: Px,
@@ -88,6 +90,8 @@ where
             value: value.into_dynamic(),
             minimum: min.into_value(),
             maximum: max.into_value(),
+            knob_visible: true,
+            interactive: true,
             step: Value::Constant(ZeroToOne::new(0.05)),
             knob_size: UPx::ZERO,
             horizontal: true,
@@ -126,15 +130,32 @@ where
         self
     }
 
+    /// Updates this slider to not show knobs and returns self.
+    ///
+    /// This also prevents the slider from being focused.
+    #[must_use]
+    pub fn knobless(mut self) -> Self {
+        self.knob_visible = false;
+        self
+    }
+
+    /// Updates this slider to ignore all user input and returns self.
+    #[must_use]
+    pub fn non_interactive(mut self) -> Self {
+        self.interactive = false;
+        self
+    }
+
     fn draw_track(&mut self, spec: &TrackSpec, context: &mut GraphicsContext<'_, '_, '_, '_, '_>) {
         if self.horizontal {
             self.rendered_size = spec.size.width;
         } else {
             self.rendered_size = spec.size.height;
         }
-        let half_focus_ring = (Lp::points(2).into_px(context.gfx.scale()) / 2).ceil();
+        let half_focus_ring =
+            spec.if_knobbed(|| (Lp::points(2).into_px(context.gfx.scale()) / 2).ceil());
         let focus_ring = half_focus_ring * 2;
-        let track_length = self.rendered_size - spec.knob_size - focus_ring;
+        let track_length = self.rendered_size - spec.if_knobbed(|| spec.knob_size - focus_ring);
         let (start, end) = if let Some(end) = spec.end {
             (track_length * spec.start, track_length * end)
         } else {
@@ -143,15 +164,13 @@ where
         let inset = Point::squared(half_focus_ring);
 
         let half_track = spec.track_size / 2;
+        let start_inset = (spec.half_knob - half_track).max(Px::ZERO);
         // Draw the track
         if start > 0 {
             context.gfx.draw_shape(
                 Shape::filled_round_rect(
                     Rect::new(
-                        flipped(
-                            !self.horizontal,
-                            Point::new(spec.half_knob - half_track, spec.half_knob - half_track),
-                        ),
+                        flipped(!self.horizontal, Point::new(start_inset, start_inset)),
                         flipped(!self.horizontal, Size::new(start, spec.track_size)),
                     ),
                     half_track,
@@ -166,11 +185,14 @@ where
                     Rect::new(
                         flipped(
                             !self.horizontal,
-                            Point::new(end + spec.half_knob, spec.half_knob - half_track),
+                            Point::new(end + spec.if_knobbed(|| spec.half_knob), start_inset),
                         ),
                         flipped(
                             !self.horizontal,
-                            Size::new(track_length - end + half_track, spec.track_size),
+                            Size::new(
+                                track_length - end + spec.if_knobbed(|| half_track),
+                                spec.track_size,
+                            ),
                         ),
                     ),
                     half_track,
@@ -187,13 +209,16 @@ where
                         flipped(
                             !self.horizontal,
                             Point::new(
-                                start + spec.half_knob - half_track,
-                                spec.half_knob - half_track,
+                                start + spec.if_knobbed(|| spec.half_knob - half_track),
+                                start_inset,
                             ),
                         ),
                         flipped(
                             !self.horizontal,
-                            Size::new(end - start + spec.track_size, spec.track_size),
+                            Size::new(
+                                end - start + spec.if_knobbed(|| spec.track_size),
+                                spec.track_size,
+                            ),
                         ),
                     ),
                     half_track,
@@ -204,34 +229,73 @@ where
         }
 
         // Draw the knob
-        let focused = context.focused();
-        let this_knob_role = if spec.end.is_some() {
-            Knob::End
-        } else {
-            Knob::Start
-        };
-        self.draw_knob(
-            flipped(
-                !self.horizontal,
-                Point::new(end + spec.half_knob, spec.half_knob) + inset,
-            ),
-            focused && self.focused_knob == Some(this_knob_role),
-            focus_ring,
-            spec,
-            context,
-        );
-
-        if spec.end.is_some() {
-            self.draw_knob(
+        if spec.knob_size > 0 {
+            let focus = context.focused().then_some(self.focused_knob).flatten();
+            self.draw_knobs(
                 flipped(
                     !self.horizontal,
-                    Point::new(start + spec.half_knob, spec.half_knob) + inset,
+                    Point::new(end + spec.half_knob, spec.half_knob) + inset,
                 ),
-                focused && matches!(self.focused_knob, Some(Knob::Start)),
+                spec.end.map(|_| {
+                    flipped(
+                        !self.horizontal,
+                        Point::new(start + spec.half_knob, spec.half_knob) + inset,
+                    )
+                }),
+                focus,
                 focus_ring,
                 spec,
                 context,
             );
+            // let this_knob_role = if spec.end.is_some() {
+            //     Knob::End
+            // } else {
+            //     Knob::Start
+            // };
+            // self.draw_knob(
+            //     flipped(
+            //         !self.horizontal,
+            //         Point::new(end + spec.half_knob, spec.half_knob) + inset,
+            //     ),
+            //     focused && self.focused_knob == Some(this_knob_role),
+            //     focus_ring,
+            //     spec,
+            //     context,
+            // );
+
+            // if spec.end.is_some() {
+            //     self.draw_knob(
+            //         flipped(
+            //             !self.horizontal,
+            //             Point::new(start + spec.half_knob, spec.half_knob) + inset,
+            //         ),
+            //         focused && matches!(self.focused_knob, Some(Knob::Start)),
+            //         focus_ring,
+            //         spec,
+            //         context,
+            //     );
+            // }
+        }
+    }
+
+    fn draw_knobs(
+        &mut self,
+        end_knob: Point<Px>,
+        start_knob: Option<Point<Px>>,
+        focus: Option<Knob>,
+        focus_ring_width: Px,
+        spec: &TrackSpec,
+        context: &mut GraphicsContext<'_, '_, '_, '_, '_>,
+    ) {
+        let (a, a_is_focused, b) = match (start_knob, focus) {
+            (Some(start_knob), Some(Knob::Start)) => (end_knob, false, Some((start_knob, true))),
+            (Some(start_knob), focus) => (start_knob, false, Some((end_knob, focus.is_some()))),
+            (None, focus) => (end_knob, focus.is_some(), None),
+        };
+
+        self.draw_knob(a, a_is_focused, focus_ring_width, spec, context);
+        if let Some((b, b_is_focused)) = b {
+            self.draw_knob(b, b_is_focused, focus_ring_width, spec, context);
         }
     }
 
@@ -291,20 +355,16 @@ where
                 let end_percent = end.percent_between(&min, &max);
                 let knob_width_as_percent =
                     self.knob_size.into_float() / 2. / track_width.into_float();
-                if percent - *start_percent <= knob_width_as_percent
-                    && matches!(previous_focus, Some(Knob::Start))
-                {
+                let start_delta = percent - *start_percent;
+                let end_delta = *end_percent - percent;
+                let on_overlapping_knobs =
+                    end_delta <= knob_width_as_percent && start_delta <= knob_width_as_percent;
+                if let (true, Some(previous)) = (on_overlapping_knobs, previous_focus) {
+                    previous
+                } else if start_delta < end_delta {
                     Knob::Start
-                } else if *end_percent - percent <= knob_width_as_percent
-                    && matches!(previous_focus, Some(Knob::End))
-                {
-                    Knob::End
-                } else if value <= start {
-                    Knob::Start
-                } else if &value >= end {
-                    Knob::End
                 } else {
-                    Knob::Start
+                    Knob::End
                 }
             };
             match knob {
@@ -390,10 +450,10 @@ where
         let inactive_track_color = context.get(&InactiveTrackColor);
         let knob_color = context.get(&KnobColor);
         let knob_size = self.knob_size.into_signed();
-        let track_size = context
-            .get(&TrackSize)
-            .into_px(context.gfx.scale())
-            .min(knob_size);
+        let mut track_size = context.get(&TrackSize).into_px(context.gfx.scale());
+        if knob_size > 0 {
+            track_size = track_size.min(knob_size);
+        }
 
         let half_knob = knob_size / 2;
 
@@ -460,12 +520,24 @@ where
         available_space: Size<ConstraintLimit>,
         context: &mut LayoutContext<'_, '_, '_, '_, '_>,
     ) -> Size<UPx> {
-        self.knob_size = context.get(&KnobSize).into_upx(context.gfx.scale());
+        self.knob_size = if self.knob_visible {
+            context.get(&KnobSize).into_upx(context.gfx.scale())
+        } else {
+            UPx::ZERO
+        };
         let minimum_size = context
             .get(&MinimumSliderSize)
             .into_upx(context.gfx.scale());
-        let focus_ring_width = (Lp::points(2).into_upx(context.gfx.scale()) / 2).ceil() * 2;
-        let focused_knob_size = self.knob_size + focus_ring_width;
+        let focus_ring_width = if self.knob_visible {
+            (Lp::points(2).into_upx(context.gfx.scale()) / 2).ceil() * 2
+        } else {
+            UPx::ZERO
+        };
+        let static_side = if self.knob_visible {
+            self.knob_size + focus_ring_width
+        } else {
+            context.get(&TrackSize).into_upx(context.gfx.scale())
+        };
 
         match (available_space.width, available_space.height) {
             (ConstraintLimit::Fill(width), ConstraintLimit::Fill(height)) => {
@@ -473,17 +545,17 @@ where
                 // up with a horizontal slider.
                 if width < height {
                     // Vertical slider
-                    Size::new(focused_knob_size, height.max(minimum_size))
+                    Size::new(static_side, height.max(minimum_size))
                 } else {
                     // Horizontal slider
-                    Size::new(width.max(minimum_size), focused_knob_size)
+                    Size::new(width.max(minimum_size), static_side)
                 }
             }
             (ConstraintLimit::Fill(width), ConstraintLimit::SizeToFit(_)) => {
-                Size::new(width.max(minimum_size), focused_knob_size)
+                Size::new(width.max(minimum_size), static_side)
             }
             (ConstraintLimit::SizeToFit(_), ConstraintLimit::Fill(height)) => {
-                Size::new(focused_knob_size, height.max(minimum_size))
+                Size::new(static_side, height.max(minimum_size))
             }
             (ConstraintLimit::SizeToFit(width), ConstraintLimit::SizeToFit(_)) => {
                 // When we have no limit on our, we still want to be draggable.
@@ -493,17 +565,17 @@ where
                 // user of the slider, a horizontal slider is expected. So, we
                 // set the minimum measurement based on a horizontal
                 // orientation.
-                Size::new(width.min(minimum_size), focused_knob_size)
+                Size::new(width.min(minimum_size), static_side)
             }
         }
     }
 
     fn hit_test(&mut self, _location: Point<Px>, _context: &mut EventContext<'_, '_>) -> bool {
-        true
+        self.interactive
     }
 
     fn accept_focus(&mut self, context: &mut EventContext<'_, '_>) -> bool {
-        context.get(&AutoFocusableControls).is_all()
+        self.interactive && self.knob_visible && context.get(&AutoFocusableControls).is_all()
     }
 
     fn focus(&mut self, context: &mut EventContext<'_, '_>) {
@@ -556,6 +628,10 @@ where
         _button: MouseButton,
         context: &mut EventContext<'_, '_>,
     ) -> EventHandling {
+        let true = self.interactive else {
+            return IGNORED;
+        };
+
         let previous_focus = match (self.previous_focus.take(), self.focused_knob.take()) {
             (None | Some(_), Some(focus)) | (Some(focus), None) => Some(focus),
             (None, None) => None,
@@ -593,6 +669,10 @@ where
         _is_synthetic: bool,
         _context: &mut EventContext<'_, '_>,
     ) -> EventHandling {
+        let true = self.interactive else {
+            return IGNORED;
+        };
+
         let forwards = match input.logical_key {
             Key::Named(NamedKey::ArrowLeft | NamedKey::ArrowUp) => false,
             Key::Named(NamedKey::ArrowRight | NamedKey::ArrowDown) => true,
@@ -614,6 +694,10 @@ where
         _phase: TouchPhase,
         _context: &mut EventContext<'_, '_>,
     ) -> EventHandling {
+        let true = self.interactive else {
+            return IGNORED;
+        };
+
         let factor: f32 = match delta {
             MouseScrollDelta::LineDelta(_, y) => y,
             MouseScrollDelta::PixelDelta(pt) => pt.y.cast(),
@@ -645,6 +729,19 @@ struct TrackSpec {
     inactive_track_color: Color,
 }
 
+impl TrackSpec {
+    fn if_knobbed<R>(&self, knobbed: impl FnOnce() -> R) -> R
+    where
+        R: Default,
+    {
+        if self.knob_size > 0 {
+            knobbed()
+        } else {
+            R::default()
+        }
+    }
+}
+
 fn flipped<T, Unit>(flip: bool, value: T) -> T
 where
     T: IntoComponents<Unit> + FromComponents<Unit>,