Retire the zone system: one capture = one parameter set, and re-seam the engine and Sample face into bands

src/core/instrument/ui/keyboard_strip.h

@@ -1,11 +1,10 @@
-// keyboard_strip.h — layout + hit-test + drag math for the capture-first editor's
-// keyboard strip. Mirror of editor_geometry/embed_strip/mode_switch; the shell draws
-// and marshals mouse events into these functions.
+// keyboard_strip.h — layout + hit-test + drag math for the editor's keyboard strip.
+// Mirror of embed_strip/mode_switch; the shell draws and marshals mouse events into these
+// functions.
 //
 // The strip maps the full 128-key MIDI span across a horizontal band (the same idiom
-// embed_strip uses) and serves two faces: the single-capture fast path (a root marker,
-// click-a-key or drag it to set root) and the opt-in zones panel (each zone drawn as a
-// bar with edge-grab resize handles + a body move-handle).
+// embed_strip uses). The loaded capture responds across that whole span, so the strip's
+// job is the root marker: click a key, or drag the marker, to set the root.
 
 #pragma once
 
@@ -17,10 +16,6 @@ namespace reasampler::instrument::ui {
 // stay independent.
 inline constexpr int kStripKeyCount = 128;
 
-// Pixel width of a zone bar's edge-grab region. A zone narrower than 2x this has no
-// body move-handle (both edges win their halves).
-inline constexpr int kStripEdgeGrabWidth = 6;
-
 // The keys band takes the whole strip area today; clamped so a degenerate size never
 // yields an inverted rect.
 struct StripLayout {
@@ -37,44 +32,15 @@ int keyLeftX(const StripLayout& layout, int note);
 // Half-open rect of a single key `note`, clamped to [0,127].
 Rect keyRect(const StripLayout& layout, int note);
 
-// Root-marker rect for the single-capture fast path; equivalent to
-// keyRect(layout, rootNote) but named so the intent reads at the call site.
+// Root-marker rect; equivalent to keyRect(layout, rootNote) but named so the intent reads
+// at the call site.
 Rect rootMarkerRect(const StripLayout& layout, int rootNote);
 
 // MIDI note a point (x, y) lands on, or -1 outside the keys band.
 int keyAtPoint(const StripLayout& layout, int x, int y);
 
-// Horizontal sub-rect for a zone spanning [lowNote, highNote] inclusive. Notes clamp to
-// [0,127] and low clamps to <= high, so a malformed zone never yields an inverted rect.
-Rect zoneBarRect(const StripLayout& layout, int lowNote, int highNote);
-
-// Which part of a zone bar a grab landed on: an edge resizes that boundary, the body
-// moves the whole span, kNone means the grab missed the bar.
-enum class ZoneGrab {
-    kNone,
-    kLowEdge,
-    kHighEdge,
-    kBody,
-};
-
-// Classify a grab at (x, y) against one zone's bar. A narrow bar (< 2*kStripEdgeGrabWidth)
-// resolves the near half to each edge (no body); the low edge wins a tie at the exact
-// midpoint.
-ZoneGrab zoneGrabAt(const StripLayout& layout, int lowNote, int highNote, int x, int y);
-
-// Zone (index into the parallel `lows`/`highs` arrays, draw order) whose bar a grab
-// lands on, plus which part, or {-1, kNone} for a miss. First covering zone in draw
-// order wins.
-struct ZoneBarHit {
-    int zoneIndex = -1;
-    ZoneGrab grab = ZoneGrab::kNone;
-};
-ZoneBarHit zoneBarAtPoint(const StripLayout& layout, const int* lows, const int* highs,
-                          int count, int x, int y);
-
 // Resolves a drag to a new MIDI note: `startNote` shifted by round(dxPixels / keyWidth),
-// clamped to [0,127]. The one arithmetic behind edge-resize, body-move (apply to both
-// edges with the same delta to preserve span), and root-marker drag.
+// clamped to [0,127]. The one arithmetic behind the root-marker drag.
 int resolveDragNote(const StripLayout& layout, int startNote, int dxPixels);
 
 // True when `note` (clamped to [0,127]) is a natural (white) key in 12-tone equal