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// Responsive scrollbar with three visibility states: asleep, awake, and hovered
// Based on FLTK's scrollbar with custom drawing
use fltk::{draw as fltk_draw, enums::*, prelude::*, valuator::Scrollbar};
use std::cell::RefCell;
use std::rc::Rc;
use std::time::{Duration, Instant};
/// Visibility state of the responsive scrollbar
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum ScrollbarState {
/// Only background is rendered
Asleep,
/// Background + light gray rectangle where slider would be
Awake,
/// Full scrollbar is rendered (on hover)
Hovered,
}
/// Shared state for the responsive scrollbar
#[derive(Debug, Clone)]
struct ResponsiveScrollbarState {
state: ScrollbarState,
last_wake_time: Instant,
background_color: Color,
}
/// Responsive scrollbar wrapper
#[derive(Clone)]
pub struct ResponsiveScrollbar {
scrollbar: Scrollbar,
state: Rc<RefCell<ResponsiveScrollbarState>>,
}
impl ResponsiveScrollbar {
/// Create a new responsive scrollbar
pub fn new(x: i32, y: i32, w: i32, h: i32, background_color: Color) -> Self {
let mut scrollbar = Scrollbar::default().with_pos(x, y).with_size(w, h);
let state = Rc::new(RefCell::new(ResponsiveScrollbarState {
state: ScrollbarState::Asleep,
last_wake_time: Instant::now() - Duration::from_secs(10),
background_color,
}));
// Set up custom draw callback
scrollbar.draw({
let state = state.clone();
let sb = scrollbar.clone();
move |_| {
let st = state.borrow();
// Only check for auto-sleep transition here
// Don't check mouse position in draw callback - use handle callback for that
let x = sb.x();
let y = sb.y();
let w = sb.w();
let h = sb.h();
let rect_col = Color::from_rgb(204, 204, 204); // Light gray for slider rectangle
match st.state {
ScrollbarState::Asleep | ScrollbarState::Awake => {
// Draw background
fltk_draw::set_draw_color(st.background_color);
fltk_draw::draw_rectf(x, y, w, h);
// Draw light gray rectangle where slider would be
// Calculate slider position and size based on scrollbar values
let min = sb.minimum();
let max = sb.maximum();
let val = sb.value();
let slider_size = sb.slider_size();
let sbw = if st.state == ScrollbarState::Awake {
w - 4
} else {
3
};
let offset = if st.state == ScrollbarState::Awake {
3
} else {
w - sbw - 2
};
if max > min && slider_size > 0.0 {
let range = max - min;
let slider_frac = slider_size as f64;
// Calculate slider dimensions
let slider_height = (h as f64 * slider_frac).max(10.0) as i32;
let track_height = h - slider_height;
// Calculate slider position
let pos_frac = if range > 0.0 {
((val - min) / range).clamp(0.0, 1.0)
} else {
0.0
};
let slider_y = y + (track_height as f64 * pos_frac) as i32;
// Draw light gray slider rectangle
fltk_draw::set_draw_color(rect_col);
fltk_draw::draw_rounded_rectf(
x + offset,
slider_y + 1,
sbw,
slider_height - 2,
1,
);
}
}
ScrollbarState::Hovered => {
// Draw a proper scrollbar
// Draw scrollbar background
// fltk_draw::draw_box(
// FrameType::FlatBox,
// x,
// y,
// w,
// h,
// Color::from_rgb(240, 240, 240),
// );
fltk_draw::set_draw_color(st.background_color);
fltk_draw::draw_rectf(x, y, w, h);
// Calculate slider position and size
let min = sb.minimum();
let max = sb.maximum();
let val = sb.value();
let slider_size = sb.slider_size();
if max > min && slider_size > 0.0 {
let range = max - min;
let slider_frac = slider_size as f64;
// Calculate slider dimensions
let slider_height = (h as f64 * slider_frac).max(20.0) as i32;
let track_height = h - slider_height;
// Calculate slider position
let pos_frac = if range > 0.0 {
((val - min) / range).clamp(0.0, 1.0)
} else {
0.0
};
let slider_y = y + (track_height as f64 * pos_frac) as i32;
// Draw slider with proper 3D look
fltk_draw::draw_box(
FrameType::ThinUpBox,
x + 1,
slider_y + 1,
w - 2,
slider_height - 2,
rect_col,
);
}
}
}
}
});
// Set up handle callback for proper hover detection
scrollbar.handle({
let state = state.clone();
let mut sb = scrollbar.clone();
move |_, event| {
match event {
Event::Enter => {
// Mouse entered scrollbar area
state.borrow_mut().state = ScrollbarState::Hovered;
sb.redraw();
true // We handled this event
}
Event::Leave => {
// Mouse left scrollbar area
let mut st = state.borrow_mut();
st.state = ScrollbarState::Awake;
st.last_wake_time = Instant::now();
sb.redraw();
true
}
Event::Move => {
// Keep updating hovered state while mouse is moving over it
let mut st = state.borrow_mut();
if st.state != ScrollbarState::Hovered {
st.state = ScrollbarState::Hovered;
sb.redraw();
}
true
}
Event::Push | Event::Drag | Event::Released => {
// Ensure we're hovered during interaction
let mut st = state.borrow_mut();
st.state = ScrollbarState::Hovered;
sb.redraw();
true
}
_ => false,
}
}
});
// Set up periodic timer to check for auto-sleep (every 500ms)
{
let state_timer = state.clone();
let mut sb_timer = scrollbar.clone();
fltk::app::add_timeout3(0.1, move |handle| {
// Check if we need to transition to asleep
let needs_redraw = {
let mut st = state_timer.borrow_mut();
if st.state == ScrollbarState::Awake {
let elapsed = Instant::now().duration_since(st.last_wake_time);
if elapsed > Duration::from_secs(1) {
st.state = ScrollbarState::Asleep;
true
} else {
false
}
} else {
false
}
};
if needs_redraw {
sb_timer.redraw();
}
fltk::app::repeat_timeout3(0.1, handle);
});
}
Self { scrollbar, state }
}
/// Wake the scrollbar (transition to awake state)
pub fn wake(&mut self) {
let mut st = self.state.borrow_mut();
let old_state = st.state;
if st.state != ScrollbarState::Hovered {
st.state = ScrollbarState::Awake;
}
st.last_wake_time = Instant::now();
if old_state != st.state {
self.scrollbar.redraw();
}
}
/// Set the scrollbar type (vertical or horizontal)
pub fn set_type(&mut self, typ: fltk::valuator::ScrollbarType) {
// self.wake();
self.scrollbar.set_type(typ);
}
/// Set the bounds of the scrollbar
pub fn set_bounds(&mut self, min: f64, max: f64) {
// self.wake();
self.scrollbar.set_bounds(min, max);
}
/// Set the slider size (as a fraction)
pub fn set_slider_size(&mut self, size: f32) {
// self.wake();
self.scrollbar.set_slider_size(size);
}
/// Set the step sizes
pub fn set_step(&mut self, a: f64, b: i32) {
// self.wake();
self.scrollbar.set_step(a, b);
}
/// Set the value
pub fn set_value(&mut self, val: f64) {
// self.wake();
self.scrollbar.set_value(val);
}
/// Get the value
pub fn value(&self) -> f64 {
self.scrollbar.value()
}
/// Get the minimum value
pub fn minimum(&self) -> f64 {
self.scrollbar.minimum()
}
/// Get the maximum value
pub fn maximum(&self) -> f64 {
self.scrollbar.maximum()
}
/// Get the slider size
pub fn slider_size(&self) -> f32 {
self.scrollbar.slider_size()
}
/// Set a callback for when the scrollbar value changes
pub fn set_callback<F: FnMut(&mut Scrollbar) + 'static>(&mut self, cb: F) {
self.scrollbar.set_callback(cb);
}
/// Resize the scrollbar
pub fn resize(&mut self, x: i32, y: i32, w: i32, h: i32) {
self.scrollbar.resize(x, y, w, h);
}
/// Show the scrollbar
pub fn show(&mut self) {
self.scrollbar.show();
}
/// Redraw the scrollbar
pub fn redraw(&mut self) {
self.scrollbar.redraw();
}
/// Get the underlying scrollbar widget (for adding to parent)
pub fn as_base_widget(&self) -> fltk::widget::Widget {
self.scrollbar.as_base_widget()
}
}