iced_widget/
slider.rs

1//! Sliders let users set a value by moving an indicator.
2//!
3//! # Example
4//! ```no_run
5//! # mod iced { pub mod widget { pub use iced_widget::*; } pub use iced_widget::Renderer; pub use iced_widget::core::*; }
6//! # pub type Element<'a, Message> = iced_widget::core::Element<'a, Message, iced_widget::Theme, iced_widget::Renderer>;
7//! #
8//! use iced::widget::slider;
9//!
10//! struct State {
11//!    value: f32,
12//! }
13//!
14//! #[derive(Debug, Clone)]
15//! enum Message {
16//!     ValueChanged(f32),
17//! }
18//!
19//! fn view(state: &State) -> Element<'_, Message> {
20//!     slider(0.0..=100.0, state.value, Message::ValueChanged).into()
21//! }
22//!
23//! fn update(state: &mut State, message: Message) {
24//!     match message {
25//!         Message::ValueChanged(value) => {
26//!             state.value = value;
27//!         }
28//!     }
29//! }
30//! ```
31use crate::core::border::{self, Border};
32use crate::core::keyboard;
33use crate::core::keyboard::key::{self, Key};
34use crate::core::layout;
35use crate::core::mouse;
36use crate::core::renderer;
37use crate::core::theme::palette;
38use crate::core::touch;
39use crate::core::widget::Operation;
40use crate::core::widget::operation::accessible::{Accessible, Role, Value};
41use crate::core::widget::operation::focusable::Focusable;
42use crate::core::widget::tree::{self, Tree};
43use crate::core::window;
44use crate::core::{
45    self, Background, Color, Element, Event, Layout, Length, Pixels, Point, Rectangle, Shadow,
46    Shell, Size, Theme, Widget,
47};
48
49use std::ops::RangeInclusive;
50
51/// An horizontal bar and a handle that selects a single value from a range of
52/// values.
53///
54/// A [`Slider`] will try to fill the horizontal space of its container.
55///
56/// The [`Slider`] range of numeric values is generic and its step size defaults
57/// to 1 unit.
58///
59/// # Example
60/// ```no_run
61/// # mod iced { pub mod widget { pub use iced_widget::*; } pub use iced_widget::Renderer; pub use iced_widget::core::*; }
62/// # pub type Element<'a, Message> = iced_widget::core::Element<'a, Message, iced_widget::Theme, iced_widget::Renderer>;
63/// #
64/// use iced::widget::slider;
65///
66/// struct State {
67///    value: f32,
68/// }
69///
70/// #[derive(Debug, Clone)]
71/// enum Message {
72///     ValueChanged(f32),
73/// }
74///
75/// fn view(state: &State) -> Element<'_, Message> {
76///     slider(0.0..=100.0, state.value, Message::ValueChanged).into()
77/// }
78///
79/// fn update(state: &mut State, message: Message) {
80///     match message {
81///         Message::ValueChanged(value) => {
82///             state.value = value;
83///         }
84///     }
85/// }
86/// ```
87pub struct Slider<'a, T, Message, Theme = crate::Theme>
88where
89    Theme: Catalog,
90{
91    range: RangeInclusive<T>,
92    step: T,
93    shift_step: Option<T>,
94    value: T,
95    default: Option<T>,
96    on_change: Box<dyn Fn(T) -> Message + 'a>,
97    on_release: Option<Message>,
98    width: Length,
99    height: f32,
100    class: Theme::Class<'a>,
101    status: Option<Status>,
102}
103
104impl<'a, T, Message, Theme> Slider<'a, T, Message, Theme>
105where
106    T: Copy + From<u8> + PartialOrd,
107    Message: Clone,
108    Theme: Catalog,
109{
110    /// The default height of a [`Slider`].
111    pub const DEFAULT_HEIGHT: f32 = 16.0;
112
113    /// Creates a new [`Slider`].
114    ///
115    /// It expects:
116    ///   * an inclusive range of possible values
117    ///   * the current value of the [`Slider`]
118    ///   * a function that will be called when the [`Slider`] is dragged.
119    ///     It receives the new value of the [`Slider`] and must produce a
120    ///     `Message`.
121    pub fn new<F>(range: RangeInclusive<T>, value: T, on_change: F) -> Self
122    where
123        F: 'a + Fn(T) -> Message,
124    {
125        let value = if value >= *range.start() {
126            value
127        } else {
128            *range.start()
129        };
130
131        let value = if value <= *range.end() {
132            value
133        } else {
134            *range.end()
135        };
136
137        Slider {
138            value,
139            default: None,
140            range,
141            step: T::from(1),
142            shift_step: None,
143            on_change: Box::new(on_change),
144            on_release: None,
145            width: Length::Fill,
146            height: Self::DEFAULT_HEIGHT,
147            class: Theme::default(),
148            status: None,
149        }
150    }
151
152    /// Sets the optional default value for the [`Slider`].
153    ///
154    /// If set, the [`Slider`] will reset to this value when ctrl-clicked or command-clicked.
155    pub fn default(mut self, default: impl Into<T>) -> Self {
156        self.default = Some(default.into());
157        self
158    }
159
160    /// Sets the release message of the [`Slider`].
161    /// This is called when the mouse is released from the slider.
162    ///
163    /// Typically, the user's interaction with the slider is finished when this message is produced.
164    /// This is useful if you need to spawn a long-running task from the slider's result, where
165    /// the default on_change message could create too many events.
166    pub fn on_release(mut self, on_release: Message) -> Self {
167        self.on_release = Some(on_release);
168        self
169    }
170
171    /// Sets the width of the [`Slider`].
172    pub fn width(mut self, width: impl Into<Length>) -> Self {
173        self.width = width.into();
174        self
175    }
176
177    /// Sets the height of the [`Slider`].
178    pub fn height(mut self, height: impl Into<Pixels>) -> Self {
179        self.height = height.into().0;
180        self
181    }
182
183    /// Sets the step size of the [`Slider`].
184    pub fn step(mut self, step: impl Into<T>) -> Self {
185        self.step = step.into();
186        self
187    }
188
189    /// Sets the optional "shift" step for the [`Slider`].
190    ///
191    /// If set, this value is used as the step while the shift key is pressed.
192    pub fn shift_step(mut self, shift_step: impl Into<T>) -> Self {
193        self.shift_step = Some(shift_step.into());
194        self
195    }
196
197    /// Sets the style of the [`Slider`].
198    #[must_use]
199    pub fn style(mut self, style: impl Fn(&Theme, Status) -> Style + 'a) -> Self
200    where
201        Theme::Class<'a>: From<StyleFn<'a, Theme>>,
202    {
203        self.class = (Box::new(style) as StyleFn<'a, Theme>).into();
204        self
205    }
206
207    /// Sets the style class of the [`Slider`].
208    #[cfg(feature = "advanced")]
209    #[must_use]
210    pub fn class(mut self, class: impl Into<Theme::Class<'a>>) -> Self {
211        self.class = class.into();
212        self
213    }
214}
215
216impl<T, Message, Theme, Renderer> Widget<Message, Theme, Renderer> for Slider<'_, T, Message, Theme>
217where
218    T: Copy + Into<f64> + num_traits::FromPrimitive,
219    Message: Clone,
220    Theme: Catalog,
221    Renderer: core::Renderer,
222{
223    fn tag(&self) -> tree::Tag {
224        tree::Tag::of::<State>()
225    }
226
227    fn state(&self) -> tree::State {
228        tree::State::new(State::default())
229    }
230
231    fn size(&self) -> Size<Length> {
232        Size {
233            width: self.width,
234            height: Length::Shrink,
235        }
236    }
237
238    fn layout(
239        &mut self,
240        _tree: &mut Tree,
241        _renderer: &Renderer,
242        limits: &layout::Limits,
243    ) -> layout::Node {
244        layout::atomic(limits, self.width, self.height)
245    }
246
247    fn operate(
248        &mut self,
249        tree: &mut Tree,
250        layout: Layout<'_>,
251        _renderer: &Renderer,
252        operation: &mut dyn Operation,
253    ) {
254        let state = tree.state.downcast_mut::<State>();
255
256        operation.accessible(
257            None,
258            layout.bounds(),
259            &Accessible {
260                role: Role::Slider,
261                value: Some(Value::Numeric {
262                    current: self.value.into(),
263                    min: (*self.range.start()).into(),
264                    max: (*self.range.end()).into(),
265                    step: Some(self.step.into()),
266                }),
267                ..Accessible::default()
268            },
269        );
270
271        operation.focusable(None, layout.bounds(), state);
272    }
273
274    fn update(
275        &mut self,
276        tree: &mut Tree,
277        event: &Event,
278        layout: Layout<'_>,
279        cursor: mouse::Cursor,
280        _renderer: &Renderer,
281        shell: &mut Shell<'_, Message>,
282        _viewport: &Rectangle,
283    ) {
284        let state = tree.state.downcast_mut::<State>();
285
286        let mut update = || {
287            let current_value = self.value;
288
289            let locate = |cursor_position: Point| -> Option<T> {
290                let bounds = layout.bounds();
291
292                if cursor_position.x <= bounds.x {
293                    Some(*self.range.start())
294                } else if cursor_position.x >= bounds.x + bounds.width {
295                    Some(*self.range.end())
296                } else {
297                    let step = if state.keyboard_modifiers.shift() {
298                        self.shift_step.unwrap_or(self.step)
299                    } else {
300                        self.step
301                    }
302                    .into();
303
304                    let start = (*self.range.start()).into();
305                    let end = (*self.range.end()).into();
306
307                    let percent = f64::from(cursor_position.x - bounds.x) / f64::from(bounds.width);
308
309                    let steps = (percent * (end - start) / step).round();
310                    let value = steps * step + start;
311
312                    T::from_f64(value.min(end))
313                }
314            };
315
316            let increment = |value: T| -> Option<T> {
317                let step = if state.keyboard_modifiers.shift() {
318                    self.shift_step.unwrap_or(self.step)
319                } else {
320                    self.step
321                }
322                .into();
323
324                let steps = (value.into() / step).round();
325                let new_value = step * (steps + 1.0);
326
327                if new_value > (*self.range.end()).into() {
328                    return Some(*self.range.end());
329                }
330
331                T::from_f64(new_value)
332            };
333
334            let decrement = |value: T| -> Option<T> {
335                let step = if state.keyboard_modifiers.shift() {
336                    self.shift_step.unwrap_or(self.step)
337                } else {
338                    self.step
339                }
340                .into();
341
342                let steps = (value.into() / step).round();
343                let new_value = step * (steps - 1.0);
344
345                if new_value < (*self.range.start()).into() {
346                    return Some(*self.range.start());
347                }
348
349                T::from_f64(new_value)
350            };
351
352            let page_increment = |value: T| -> Option<T> {
353                let step = self.step.into() * 10.0;
354                let new_value = value.into() + step;
355
356                if new_value > (*self.range.end()).into() {
357                    return Some(*self.range.end());
358                }
359
360                T::from_f64(new_value)
361            };
362
363            let page_decrement = |value: T| -> Option<T> {
364                let step = self.step.into() * 10.0;
365                let new_value = value.into() - step;
366
367                if new_value < (*self.range.start()).into() {
368                    return Some(*self.range.start());
369                }
370
371                T::from_f64(new_value)
372            };
373
374            let mut change = |new_value: T| {
375                if (self.value.into() - new_value.into()).abs() > f64::EPSILON {
376                    shell.publish((self.on_change)(new_value));
377
378                    self.value = new_value;
379                }
380            };
381
382            match &event {
383                Event::Mouse(mouse::Event::ButtonPressed(mouse::Button::Left))
384                | Event::Touch(touch::Event::FingerPressed { .. }) => {
385                    if let Some(cursor_position) = cursor.position_over(layout.bounds()) {
386                        state.is_focused = true;
387                        state.focus_visible = false;
388
389                        if state.keyboard_modifiers.command() {
390                            let _ = self.default.map(change);
391                            state.is_dragging = false;
392                        } else {
393                            let _ = locate(cursor_position).map(change);
394                            state.is_dragging = true;
395                        }
396
397                        shell.capture_event();
398                    } else {
399                        state.is_focused = false;
400                        state.focus_visible = false;
401                    }
402                }
403                Event::Mouse(mouse::Event::ButtonReleased(mouse::Button::Left))
404                | Event::Touch(touch::Event::FingerLifted { .. })
405                | Event::Touch(touch::Event::FingerLost { .. }) => {
406                    if state.is_dragging {
407                        if let Some(on_release) = self.on_release.clone() {
408                            shell.publish(on_release);
409                        }
410                        state.is_dragging = false;
411                    }
412                }
413                Event::Mouse(mouse::Event::CursorMoved { .. })
414                | Event::Touch(touch::Event::FingerMoved { .. }) => {
415                    if state.is_dragging {
416                        let _ = cursor.land().position().and_then(locate).map(change);
417
418                        shell.capture_event();
419                    }
420                }
421                Event::Mouse(mouse::Event::WheelScrolled { delta })
422                    if state.keyboard_modifiers.control() =>
423                {
424                    if cursor.is_over(layout.bounds()) {
425                        let delta = match delta {
426                            mouse::ScrollDelta::Lines { x: _, y } => y,
427                            mouse::ScrollDelta::Pixels { x: _, y } => y,
428                        };
429
430                        if *delta < 0.0 {
431                            let _ = decrement(current_value).map(change);
432                        } else {
433                            let _ = increment(current_value).map(change);
434                        }
435
436                        shell.capture_event();
437                    }
438                }
439                Event::Keyboard(keyboard::Event::KeyPressed { key, .. }) => {
440                    if cursor.is_over(layout.bounds()) || state.is_focused {
441                        match key {
442                            Key::Named(key::Named::ArrowUp | key::Named::ArrowRight) => {
443                                let _ = increment(current_value).map(change);
444                                shell.capture_event();
445                            }
446                            Key::Named(key::Named::ArrowDown | key::Named::ArrowLeft) => {
447                                let _ = decrement(current_value).map(change);
448                                shell.capture_event();
449                            }
450                            Key::Named(key::Named::PageUp) => {
451                                let _ = page_increment(current_value).map(change);
452                                shell.capture_event();
453                            }
454                            Key::Named(key::Named::PageDown) => {
455                                let _ = page_decrement(current_value).map(change);
456                                shell.capture_event();
457                            }
458                            Key::Named(key::Named::Home) => {
459                                change(*self.range.start());
460                                shell.capture_event();
461                            }
462                            Key::Named(key::Named::End) => {
463                                change(*self.range.end());
464                                shell.capture_event();
465                            }
466                            Key::Named(key::Named::Escape) => {
467                                if state.is_focused {
468                                    state.is_focused = false;
469                                    state.focus_visible = false;
470                                    shell.capture_event();
471                                }
472                            }
473                            _ => (),
474                        }
475                    }
476                }
477                Event::Keyboard(keyboard::Event::ModifiersChanged(modifiers)) => {
478                    state.keyboard_modifiers = *modifiers;
479                }
480                _ => {}
481            }
482        };
483
484        update();
485
486        let current_status = if state.is_dragging {
487            Status::Dragged
488        } else if state.focus_visible {
489            Status::Focused
490        } else if cursor.is_over(layout.bounds()) {
491            Status::Hovered
492        } else {
493            Status::Active
494        };
495
496        if let Event::Window(window::Event::RedrawRequested(_now)) = event {
497            self.status = Some(current_status);
498        } else if self.status.is_some_and(|status| status != current_status) {
499            shell.request_redraw();
500        }
501    }
502
503    fn draw(
504        &self,
505        _tree: &Tree,
506        renderer: &mut Renderer,
507        theme: &Theme,
508        _style: &renderer::Style,
509        layout: Layout<'_>,
510        _cursor: mouse::Cursor,
511        _viewport: &Rectangle,
512    ) {
513        let bounds = layout.bounds();
514
515        let style = theme.style(&self.class, self.status.unwrap_or(Status::Active));
516
517        let (handle_width, handle_height, handle_border_radius) = match style.handle.shape {
518            HandleShape::Circle { radius } => (radius * 2.0, radius * 2.0, radius.into()),
519            HandleShape::Rectangle {
520                width,
521                border_radius,
522            } => (f32::from(width), bounds.height, border_radius),
523        };
524
525        let value = self.value.into() as f32;
526        let (range_start, range_end) = {
527            let (start, end) = self.range.clone().into_inner();
528
529            (start.into() as f32, end.into() as f32)
530        };
531
532        let offset = if range_start >= range_end {
533            0.0
534        } else {
535            (bounds.width - handle_width) * (value - range_start) / (range_end - range_start)
536        };
537
538        let rail_y = bounds.y + bounds.height / 2.0;
539
540        renderer.fill_quad(
541            renderer::Quad {
542                bounds: Rectangle {
543                    x: bounds.x,
544                    y: rail_y - style.rail.width / 2.0,
545                    width: offset + handle_width / 2.0,
546                    height: style.rail.width,
547                },
548                border: style.rail.border,
549                ..renderer::Quad::default()
550            },
551            style.rail.backgrounds.0,
552        );
553
554        renderer.fill_quad(
555            renderer::Quad {
556                bounds: Rectangle {
557                    x: bounds.x + offset + handle_width / 2.0,
558                    y: rail_y - style.rail.width / 2.0,
559                    width: bounds.width - offset - handle_width / 2.0,
560                    height: style.rail.width,
561                },
562                border: style.rail.border,
563                ..renderer::Quad::default()
564            },
565            style.rail.backgrounds.1,
566        );
567
568        renderer.fill_quad(
569            renderer::Quad {
570                bounds: Rectangle {
571                    x: bounds.x + offset,
572                    y: rail_y - handle_height / 2.0,
573                    width: handle_width,
574                    height: handle_height,
575                },
576                border: Border {
577                    radius: handle_border_radius,
578                    width: style.handle.border_width,
579                    color: style.handle.border_color,
580                },
581                shadow: style.handle.shadow,
582                ..renderer::Quad::default()
583            },
584            style.handle.background,
585        );
586    }
587
588    fn mouse_interaction(
589        &self,
590        tree: &Tree,
591        layout: Layout<'_>,
592        cursor: mouse::Cursor,
593        _viewport: &Rectangle,
594        _renderer: &Renderer,
595    ) -> mouse::Interaction {
596        let state = tree.state.downcast_ref::<State>();
597
598        if state.is_dragging {
599            // FIXME: Fall back to `Pointer` on Windows
600            // See https://github.com/rust-windowing/winit/issues/1043
601            if cfg!(target_os = "windows") {
602                mouse::Interaction::Pointer
603            } else {
604                mouse::Interaction::Grabbing
605            }
606        } else if cursor.is_over(layout.bounds()) {
607            if cfg!(target_os = "windows") {
608                mouse::Interaction::Pointer
609            } else {
610                mouse::Interaction::Grab
611            }
612        } else {
613            mouse::Interaction::default()
614        }
615    }
616}
617
618impl<'a, T, Message, Theme, Renderer> From<Slider<'a, T, Message, Theme>>
619    for Element<'a, Message, Theme, Renderer>
620where
621    T: Copy + Into<f64> + num_traits::FromPrimitive + 'a,
622    Message: Clone + 'a,
623    Theme: Catalog + 'a,
624    Renderer: core::Renderer + 'a,
625{
626    fn from(slider: Slider<'a, T, Message, Theme>) -> Element<'a, Message, Theme, Renderer> {
627        Element::new(slider)
628    }
629}
630
631#[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
632struct State {
633    is_dragging: bool,
634    is_focused: bool,
635    focus_visible: bool,
636    keyboard_modifiers: keyboard::Modifiers,
637}
638
639impl Focusable for State {
640    fn is_focused(&self) -> bool {
641        self.is_focused
642    }
643
644    fn focus(&mut self) {
645        self.is_focused = true;
646        self.focus_visible = true;
647    }
648
649    fn unfocus(&mut self) {
650        self.is_focused = false;
651        self.focus_visible = false;
652    }
653}
654
655/// The possible status of a [`Slider`].
656#[derive(Debug, Clone, Copy, PartialEq, Eq)]
657pub enum Status {
658    /// The [`Slider`] can be interacted with.
659    Active,
660    /// The [`Slider`] is being hovered.
661    Hovered,
662    /// The [`Slider`] is being dragged.
663    Dragged,
664    /// The [`Slider`] has keyboard focus.
665    Focused,
666}
667
668/// The appearance of a slider.
669#[derive(Debug, Clone, Copy, PartialEq)]
670pub struct Style {
671    /// The colors of the rail of the slider.
672    pub rail: Rail,
673    /// The appearance of the [`Handle`] of the slider.
674    pub handle: Handle,
675}
676
677impl Style {
678    /// Changes the [`HandleShape`] of the [`Style`] to a circle
679    /// with the given radius.
680    pub fn with_circular_handle(mut self, radius: impl Into<Pixels>) -> Self {
681        self.handle.shape = HandleShape::Circle {
682            radius: radius.into().0,
683        };
684        self
685    }
686}
687
688/// The appearance of a slider rail
689#[derive(Debug, Clone, Copy, PartialEq)]
690pub struct Rail {
691    /// The backgrounds of the rail of the slider.
692    pub backgrounds: (Background, Background),
693    /// The width of the stroke of a slider rail.
694    pub width: f32,
695    /// The border of the rail.
696    pub border: Border,
697}
698
699/// The appearance of the handle of a slider.
700#[derive(Debug, Clone, Copy, PartialEq)]
701pub struct Handle {
702    /// The shape of the handle.
703    pub shape: HandleShape,
704    /// The [`Background`] of the handle.
705    pub background: Background,
706    /// The border width of the handle.
707    pub border_width: f32,
708    /// The border [`Color`] of the handle.
709    pub border_color: Color,
710    /// The [`Shadow`] of the handle.
711    pub shadow: Shadow,
712}
713
714/// The shape of the handle of a slider.
715#[derive(Debug, Clone, Copy, PartialEq)]
716pub enum HandleShape {
717    /// A circular handle.
718    Circle {
719        /// The radius of the circle.
720        radius: f32,
721    },
722    /// A rectangular shape.
723    Rectangle {
724        /// The width of the rectangle.
725        width: u16,
726        /// The border radius of the corners of the rectangle.
727        border_radius: border::Radius,
728    },
729}
730
731/// The theme catalog of a [`Slider`].
732pub trait Catalog: Sized {
733    /// The item class of the [`Catalog`].
734    type Class<'a>;
735
736    /// The default class produced by the [`Catalog`].
737    fn default<'a>() -> Self::Class<'a>;
738
739    /// The [`Style`] of a class with the given status.
740    fn style(&self, class: &Self::Class<'_>, status: Status) -> Style;
741}
742
743/// A styling function for a [`Slider`].
744pub type StyleFn<'a, Theme> = Box<dyn Fn(&Theme, Status) -> Style + 'a>;
745
746impl Catalog for Theme {
747    type Class<'a> = StyleFn<'a, Self>;
748
749    fn default<'a>() -> Self::Class<'a> {
750        Box::new(default)
751    }
752
753    fn style(&self, class: &Self::Class<'_>, status: Status) -> Style {
754        class(self, status)
755    }
756}
757
758/// The default style of a [`Slider`].
759pub fn default(theme: &Theme, status: Status) -> Style {
760    let palette = theme.palette();
761
762    let color = match status {
763        Status::Active => palette.primary.base.color,
764        Status::Hovered | Status::Focused => palette.primary.strong.color,
765        Status::Dragged => palette.primary.weak.color,
766    };
767
768    let (handle_border_color, handle_border_width, handle_shadow) = match status {
769        Status::Focused => {
770            let accent = palette.primary.strong.color;
771            let page_bg = palette.background.base.color;
772            (
773                palette::focus_border_color(color, accent, page_bg),
774                2.0,
775                palette::focus_shadow(accent, page_bg),
776            )
777        }
778        _ => (Color::TRANSPARENT, 0.0, Shadow::default()),
779    };
780
781    Style {
782        rail: Rail {
783            backgrounds: (color.into(), palette.background.strong.color.into()),
784            width: 4.0,
785            border: Border {
786                radius: 2.0.into(),
787                width: 0.0,
788                color: Color::TRANSPARENT,
789            },
790        },
791        handle: Handle {
792            shape: HandleShape::Circle { radius: 7.0 },
793            background: color.into(),
794            border_color: handle_border_color,
795            border_width: handle_border_width,
796            shadow: handle_shadow,
797        },
798    }
799}
800
801#[cfg(test)]
802mod tests {
803    use super::*;
804    use crate::core::widget::operation::focusable::Focusable;
805
806    #[test]
807    fn focusable_trait() {
808        let mut state = State::default();
809        assert!(!state.is_focused());
810        assert!(!state.focus_visible);
811        state.focus();
812        assert!(state.is_focused());
813        assert!(state.focus_visible);
814        state.unfocus();
815        assert!(!state.is_focused());
816        assert!(!state.focus_visible);
817    }
818
819    #[test]
820    fn default_state_not_focused() {
821        let state = State::default();
822        assert!(!state.is_focused);
823        assert!(!state.is_dragging);
824        assert!(!state.focus_visible);
825    }
826
827    #[test]
828    fn focus_independent_of_drag() {
829        let mut state = State::default();
830
831        state.focus();
832        assert!(!state.is_dragging);
833
834        state.is_dragging = true;
835        assert!(state.is_focused());
836
837        state.unfocus();
838        assert!(state.is_dragging);
839    }
840}
iced_widget/slider.rs

iced_widget/
slider.rs
