Bake window derives itself: %-knob fold, declick pad, Gate held to exhaustion, preview velocity; Hold is the one knob a loop needs

src/core/instrument/ui/sample_chrome.cpp

@@ -20,6 +20,7 @@ constexpr int kRunGap = 6;  // between adjacent items of the toolbar run
 constexpr int kChanSegW = 52;
 constexpr int kChanSegH = 18;
 constexpr int kVelCellW = 56;
+constexpr int kHoldCellW = 56;  // the bake Hold cell, same grammar as the velocity cell
 constexpr int kVelLabelH = 16;
 constexpr int kPreviewBtnW = 64;
 constexpr int kRunButtonH = 24;  // Browse and Preview
@@ -42,8 +43,8 @@ ChromeRects chromeRects(const Rect& chrome, int knobSize) {
     const auto topFor = [&row](int h) { return row.y + (row.height - h) / 2; };
     const auto leftOf = [&row](int edge, int w) { return std::max(row.x, edge - w); };
 
-    // The fixed run, right to left: Browse, Mono|Stereo, velocity cell, preview, bake. The
-    // velocity-curve button that used to sit here now lives in the deck's VELOCITY group.
+    // The fixed run, right to left: Browse, Mono|Stereo, velocity cell, preview, bake, hold.
+    // The velocity-curve button that used to sit here now lives in the deck's VELOCITY group.
     const int navH = std::min(kRunButtonH, row.height);
     const int navTop = topFor(navH);
     const int navRight = std::max(row.x, row.right() - kPad);
@@ -76,9 +77,19 @@ ChromeRects chromeRects(const Rect& chrome, int knobSize) {
     r.bake = Rect::ltrb(leftOf(bakeRight, kBakeButtonWidth), prevTop, bakeRight,
                         prevTop + std::min(kRunButtonH, row.height));
 
+    // Hold: the same knob-cell grammar as the velocity cell, immediately left of Bake.
+    const int holdRight = leftOf(r.bake.x, kRunGap);
+    r.holdCell = Rect::ltrb(leftOf(holdRight, kHoldCellW), cellTop, holdRight,
+                            cellTop + cellH);
+    const int holdKnobLeft = r.holdCell.x + (r.holdCell.width - knobSize) / 2;
+    r.holdKnob = Rect::ltrb(holdKnobLeft, r.holdCell.y, holdKnobLeft + knobSize,
+                            r.holdCell.y + std::min(knobSize, cellH));
+    r.holdLabel = Rect::ltrb(r.holdCell.x, r.holdKnob.bottom(), r.holdCell.right(),
+                             r.holdCell.bottom());
+
     // The title takes what the run leaves; clamped so a narrow window collapses it rather
     // than inverting it.
-    r.title = Rect::ltrb(row.x + kPad, row.y, std::max(row.x + kPad, r.bake.x - kRunGap),
+    r.title = Rect::ltrb(row.x + kPad, row.y, std::max(row.x + kPad, r.holdCell.x - kRunGap),
                          row.bottom());
 
     if (r.controls.empty()) return r;