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Smooth the plain mouse-wheel zoom like Ctrl+wheel

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Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
This commit is contained in:
PierrunoYT
2026-10-10 21:08:25 +02:00
co-authored by Claude Sonnet 5.5
parent 732a2f04fd
commit 3cd471b32d
1 changed files with 15 additions and 8 deletions
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crates/ui-egui/src/panels/detail.rs
+15 -8
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@@ -153,9 +153,6 @@ pub(crate) fn pan_image(app: &mut LightcraftApp, area: Rect, img: Rect, delta: e
let _ = app.run("view.navigate", json!({"pan": pan}));
}
/// Zoom factor of one mouse-wheel notch.
const WHEEL_ZOOM_STEP: f32 = 1.15;
/// Net vertical notches (up is positive) of unmodified line/page-unit wheel events: a real mouse wheel, not a trackpad.
fn wheel_notches(events: &[egui::Event]) -> f32 {
events
@@ -178,11 +175,21 @@ pub(crate) fn navigate_gesture(app: &mut LightcraftApp, ui: &mut egui::Ui, resp:
}
let (mut factor, mut delta, anchor) =
ui.input(|i| (i.zoom_delta(), i.translation_delta(), i.multi_touch().map(|t| t.center_pos).or(i.pointer.hover_pos())));
// A notched mouse wheel (line/page units, no modifier) zooms around the pointer; trackpads report points and still pan.
let notches = ui.input(|i| wheel_notches(&i.events));
if notches != 0.0 {
factor *= WHEEL_ZOOM_STEP.powf(notches);
delta = egui::Vec2::ZERO;
// A notched mouse wheel (line/page units, no modifier) zooms around the pointer, through egui's smoothed wheel
// delta like Ctrl+wheel (so it glides instead of jumping); trackpads report points and still pan.
let wheel_id = egui::Id::new("loupe-wheel-zoom");
if ui.input(|i| wheel_notches(&i.events)) != 0.0 {
ui.data_mut(|d| d.insert_temp(wheel_id, true));
}
if ui.data(|d| d.get_temp::<bool>(wheel_id)).unwrap_or(false) {
let smooth = ui.input(|i| i.smooth_scroll_delta.y);
let speed = ui.ctx().options(|o| o.input_options.scroll_zoom_speed);
if smooth == 0.0 {
ui.data_mut(|d| d.remove_temp::<bool>(wheel_id));
} else {
factor *= (speed * smooth).exp();
delta = egui::Vec2::ZERO;
}
}
if !factor.is_finite() || factor <= 0.0 || !delta.is_finite() || (factor == 1.0 && delta == egui::Vec2::ZERO) {
return false;