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Blend: a blend without a spine shows the Appearance widget

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A blend made with Create Spine set to Never now shows the Appearance
widget with the Selection and Blend tools, so its color Shift can be
dragged on the canvas as on a blend with a spine. The Easing widget
stays hidden, since easing needs a spine.

The widget sits 16 px above the halfway point, by length, of the
straight lines between the key centers that the steps are laid out
along, and a drag follows those lines' direction there. The lines are
not drawn. `blend_layout_line` exposes that line; `blend_spine` still
returns `None` for such a blend.
This commit is contained in:
dotCooCoo
2026-11-13 06:17:47 -08:00
parent e8c7421a3d
commit fc70b08f71
9 changed files with 150 additions and 18 deletions
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crates/engine/src/tests/blendopts.rs
+41
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@@ -542,6 +542,47 @@ fn dragging_a_blend_widget_is_one_undo_step_and_a_click_or_escape_none() {
assert_eq!(spec(&s, g).1.color_shift, 0.0);
}
/// A blend made without a spine has the Appearance widget alone: a drag of it with the Selection
/// tool or the Blend tool changes the color shift in one undo step, and there is no Easing widget
/// to drag.
#[test]
fn dragging_the_appearance_widget_of_a_blend_without_a_spine_is_one_undo_step() {
let mut s = session();
let (a, b) = (rect(&mut s, 0.0, 0.0, 40.0), rect(&mut s, 200.0, 0.0, 40.0));
sel(&mut s, &[a, b]);
let g = id_of(&s.execute("object.blend.make", &json!({"steps": 3, "createSpine": "never", "orientation": "path"})).unwrap());
assert!(spec(&s, g).1.no_spine);
let v = ViewInfo::default();
let depth = |s: &Session| s.doc().unwrap().history.undo.len();
let ptr = |s: &mut Session, kind: PointerKind, x: f64, y: f64| {
s.pointer(&PointerEvent::new(kind, x, y), ViewInfo::default()).unwrap();
};
for (n, tool) in [(1.0, "selection"), (2.0, "blend")] {
s.select_tool(tool, v).unwrap();
sel(&mut s, &[g]);
let d0 = depth(&s);
// The Appearance widget sits 16 px above the halfway point (120, 20) of the line between
// the key centers.
ptr(&mut s, PointerKind::Down, 120.0, 4.0);
ptr(&mut s, PointerKind::Drag, 135.0, 4.0);
ptr(&mut s, PointerKind::Up, 135.0, 4.0);
let sp = spec(&s, g).1;
assert_eq!((sp.color_shift, sp.ease.ramp, depth(&s)), (15.0 * n, 0.0, d0 + 1), "{tool}");
assert_eq!(s.doc().unwrap().selection.objects, vec![g], "{tool}: the blend stays selected");
}
s.execute("edit.undo", &json!({})).unwrap();
assert_eq!(spec(&s, g).1.color_shift, 15.0, "each drag is its own undo step");
// 16 px below there is no widget: a drag there leaves the easing and the color shift alone.
s.select_tool("selection", v).unwrap();
sel(&mut s, &[g]);
let before = spec(&s, g).1;
ptr(&mut s, PointerKind::Down, 120.0, 36.0);
ptr(&mut s, PointerKind::Drag, 150.0, 36.0);
ptr(&mut s, PointerKind::Up, 150.0, 36.0);
let after = spec(&s, g).1;
assert_eq!((after.ease, after.color_shift), (before.ease, before.color_shift), "no Easing widget");
}
#[test]
fn native_blend_easing_values_clamp_and_non_finite_become_default() {
for (bad, ramp, shift) in [