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Buttery smooth scrolling

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This commit is contained in:
Mike Dilger 2023-02-17 14:14:26 +13:00
parent 239a3ae886
commit 9defdc4795
2 changed files with 71 additions and 5 deletions
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1
src/ui/feed/mod.rs
View File

@ -119,6 +119,7 @@ fn render_a_feed(
) {
ScrollArea::vertical()
.id_source(scroll_area_id)
.override_scroll_delta(Vec2 { x: 0.0, y: app.current_scroll_offset })
.show(ui, |ui| {
let bgcolor = if ctx.style().visuals.dark_mode {
Color32::BLACK

75
src/ui/mod.rs
View File

@ -80,6 +80,8 @@ struct GossipUi {
next_frame: Instant,
override_dpi: bool,
override_dpi_value: u32,
current_scroll_offset: f32,
future_scroll_offsets: [f32; 9],
// QR codes being rendered (in feed or elsewhere)
// the f32's are the recommended image size
@ -228,6 +230,8 @@ impl GossipUi {
next_frame: Instant::now(),
override_dpi,
override_dpi_value,
current_scroll_offset: 0.0,
future_scroll_offsets: [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0],
qr_codes: HashMap::new(),
render_raw: None,
render_qr: None,
@ -320,17 +324,78 @@ impl eframe::App for GossipUi {
fn update(&mut self, ctx: &Context, frame: &mut eframe::Frame) {
let max_fps = GLOBALS.settings.blocking_read().max_fps as f32;
// Wait until the next frame
std::thread::sleep(self.next_frame - Instant::now());
self.next_frame += Duration::from_secs_f32(1.0 / max_fps);
if self.future_scroll_offsets != [0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0] {
ctx.request_repaint();
} else {
// Wait until the next frame
std::thread::sleep(self.next_frame - Instant::now());
self.next_frame += Duration::from_secs_f32(1.0 / max_fps);
// Redraw at least once per second
ctx.request_repaint_after(Duration::from_secs(1));
// Redraw at least once per second
ctx.request_repaint_after(Duration::from_secs(1));
}
if GLOBALS.shutting_down.load(Ordering::Relaxed) {
frame.close();
}
// Smooth Scrolling
{
const SCROLL_PER_FRAME: f32 = 10.0;
// Reset current frame offset
self.current_scroll_offset = 0.0;
// Pull future frame scroll deltas back, taking the first as
// our current offset
self.current_scroll_offset += self.future_scroll_offsets[0];
self.future_scroll_offsets[0] = self.future_scroll_offsets[1];
self.future_scroll_offsets[1] = self.future_scroll_offsets[2];
self.future_scroll_offsets[2] = self.future_scroll_offsets[3];
self.future_scroll_offsets[3] = self.future_scroll_offsets[4];
self.future_scroll_offsets[4] = self.future_scroll_offsets[5];
self.future_scroll_offsets[5] = self.future_scroll_offsets[6];
self.future_scroll_offsets[6] = self.future_scroll_offsets[7];
self.future_scroll_offsets[7] = self.future_scroll_offsets[8];
self.future_scroll_offsets[8] = 0.0;
// Get the amount of scroll requested
let mut requested_scroll: f32 = 0.0;
ctx.input_mut(|i| {
requested_scroll = i.scroll_delta.y;
});
// Accelerate scroll two twice as far as requested
requested_scroll *= 2.0;
// Distribute any scroll delta from this frame into future frames
if requested_scroll > 0.0 {
for pos in 0..9 {
if requested_scroll > SCROLL_PER_FRAME {
let x = (requested_scroll - SCROLL_PER_FRAME).min(SCROLL_PER_FRAME);
self.future_scroll_offsets[pos] += x;
requested_scroll -= x;
} else {
break;
}
}
}
else if requested_scroll < 0.0 {
for pos in 0..9 {
if requested_scroll < -SCROLL_PER_FRAME {
let x = (requested_scroll + SCROLL_PER_FRAME).max(-SCROLL_PER_FRAME);
self.future_scroll_offsets[pos] += x;
requested_scroll -= x;
} else {
break;
}
}
}
// Apply any remainder into the current offset
self.current_scroll_offset += requested_scroll;
}
egui::TopBottomPanel::top("menu").show(ctx, |ui| {
ui.horizontal(|ui| {
let back_label_text = RichText::new("‹ Back");