Q-W1 pt2: core/shell/app relocation + sub-namespaces; one concrete ui::Rect (LTRB fork retired); slot_map split from bank_book; BankIndex→BankModel; 59/59 green

src/core/ui/overflow_menu.cpp

@@ -0,0 +1,42 @@
+// overflow_menu — pure implementation. See overflow_menu.h. NO REAPER / SWELL / LICE / vendor.
+
+#include "core/ui/overflow_menu.h"
+
+namespace reasampler::ui {
+
+int menuButtonReserve(const MenuBarRect& bar, const MenuButtonSpec& spec) {
+    if (bar.width <= 0 || bar.height <= 0 || spec.buttonWidth <= 0) return 0;
+    // The reserve is the button width plus a right gap (rightInset) and a matching left gap
+    // (also rightInset) so the frequent buttons have breathing room before the menu button.
+    return spec.buttonWidth + 2 * spec.rightInset;
+}
+
+MenuButtonRect computeMenuButton(const MenuBarRect& bar, const MenuButtonSpec& spec) {
+    MenuButtonRect btn;
+    if (bar.width <= 0 || bar.height <= 0 || spec.buttonWidth <= 0) return btn;
+
+    const int right = bar.x + bar.width - spec.rightInset;
+    const int left = right - spec.buttonWidth;
+    if (left < bar.x + spec.minLeftInset) return btn;  // too narrow — suppress
+
+    int top = bar.y + spec.verticalInset;
+    int height = bar.height - 2 * spec.verticalInset;
+    if (height <= 0) {  // thin band: clamp to the band's own extents rather than go negative
+        top = bar.y;
+        height = bar.height;
+    }
+
+    btn.x = left;
+    btn.y = top;
+    btn.width = spec.buttonWidth;
+    btn.height = height;
+    return btn;
+}
+
+bool hitTestMenuButton(int px, int py, const MenuButtonRect& button) {
+    if (button.empty()) return false;
+    return px >= button.x && px < button.x + button.width &&
+           py >= button.y && py < button.y + button.height;
+}
+
+} // namespace reasampler::ui