feat: Add Popover UI primitive

src/internal/primitives/Dialog.tsx

@@ -51,10 +51,11 @@ export function Dialog({
       <FocusTrap active={isOpen}>
         <DismissableLayer onDismiss={onClose}>
           <div
-            aria-modal={modal}
+            aria-describedby={ariaDescribedby}
             aria-label={ariaLabel}
             aria-labelledby={ariaLabelledby}
-            aria-describedby={ariaDescribedby}
+            aria-modal={modal}
+            className="zoom-in-95 animate-in duration-200"
             data-testid="ockDialog"
             onClick={(e) => e.stopPropagation()}
             onKeyDown={(e: React.KeyboardEvent<HTMLDivElement>) => {
@@ -64,7 +65,6 @@ export function Dialog({
             }}
             ref={dialogRef}
             role="dialog"
-            className="zoom-in-95 animate-in duration-200"
           >
             {children}
           </div>

src/internal/primitives/DismissableLayer.tsx

@@ -16,8 +16,6 @@ export function DismissableLayer({
   onDismiss,
 }: DismissableLayerProps) {
   const layerRef = useRef<HTMLDivElement>(null);
-  // Tracks whether the pointer event originated inside the React component tree
-  const isPointerInsideReactTreeRef = useRef(false);
 
   useEffect(() => {
     if (disableOutsideClick && disableEscapeKey) {
@@ -30,24 +28,30 @@ export function DismissableLayer({
       }
     };
 
-    const shouldDismiss = (target: Node) => {
-      return layerRef.current && !layerRef.current.contains(target);
-    };
-
-    // Handle clicks outside the layer
     const handlePointerDown = (event: PointerEvent) => {
-      // Skip if outside clicks are disabled or if the click started inside the component
-      if (disableOutsideClick || isPointerInsideReactTreeRef.current) {
-        isPointerInsideReactTreeRef.current = false;
+      if (disableOutsideClick) {
         return;
       }
 
-      // Dismiss if click is outside the layer
-      if (shouldDismiss(event.target as Node)) {
-        onDismiss?.();
+      // If the click is inside the dismissable layer content, don't dismiss
+      // This prevents the popover from closing when clicking inside it
+      if (layerRef.current?.contains(event.target as Node)) {
+        return;
       }
-      // Reset the flag after handling the event
-      isPointerInsideReactTreeRef.current = false;
+
+      // Handling for the trigger button (e.g., settings toggle)
+      // Without this, clicking the trigger would cause both:
+      // 1. The button's onClick to fire (toggling isOpen)
+      // 2. This dismissal logic to fire (forcing close)
+      // This would create a race condition where the popover rapidly closes and reopens
+      const isTriggerClick = (event.target as HTMLElement).closest(
+        '[aria-label="Toggle swap settings"]',
+      );
+      if (isTriggerClick) {
+        return;
+      }
+
+      onDismiss?.();
     };
 
     document.addEventListener('keydown', handleKeyDown);
@@ -60,15 +64,7 @@ export function DismissableLayer({
   }, [disableOutsideClick, disableEscapeKey, onDismiss]);
 
   return (
-    <div
-      data-testid="ockDismissableLayer"
-      // Set flag when pointer event starts inside the component
-      // This prevents dismissal when dragging from inside to outside
-      onPointerDownCapture={() => {
-        isPointerInsideReactTreeRef.current = true;
-      }}
-      ref={layerRef}
-    >
+    <div data-testid="ockDismissableLayer" ref={layerRef}>
       {children}
     </div>
   );

src/internal/primitives/Popover.test.tsx

@@ -0,0 +1,224 @@
+import { cleanup, fireEvent, render, screen } from '@testing-library/react';
+import userEvent from '@testing-library/user-event';
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
+import { Popover } from './Popover';
+
+describe('Popover', () => {
+  let anchorEl: HTMLElement;
+
+  beforeEach(() => {
+    Object.defineProperty(window, 'matchMedia', {
+      writable: true,
+      value: vi.fn().mockImplementation((query) => ({
+        matches: false,
+        media: query,
+        onchange: null,
+        addListener: vi.fn(),
+        removeListener: vi.fn(),
+        addEventListener: vi.fn(),
+        removeEventListener: vi.fn(),
+        dispatchEvent: vi.fn(),
+      })),
+    });
+
+    anchorEl = document.createElement('button');
+    anchorEl.setAttribute('data-testid', 'anchor');
+    document.body.appendChild(anchorEl);
+  });
+
+  afterEach(() => {
+    cleanup();
+    document.body.innerHTML = '';
+    vi.clearAllMocks();
+  });
+
+  describe('rendering', () => {
+    it('should not render when isOpen is false', () => {
+      render(
+        <Popover anchorEl={anchorEl} isOpen={false}>
+          Content
+        </Popover>,
+      );
+
+      expect(screen.queryByTestId('ockPopover')).not.toBeInTheDocument();
+    });
+
+    it('should render when isOpen is true', () => {
+      render(
+        <Popover anchorEl={anchorEl} isOpen={true}>
+          Content
+        </Popover>,
+      );
+
+      expect(screen.getByTestId('ockPopover')).toBeInTheDocument();
+      expect(screen.getByText('Content')).toBeInTheDocument();
+    });
+
+    it('should handle null anchorEl gracefully', () => {
+      render(
+        <Popover anchorEl={null} isOpen={true}>
+          Content
+        </Popover>,
+      );
+
+      expect(screen.getByTestId('ockPopover')).toBeInTheDocument();
+    });
+  });
+
+  describe('positioning', () => {
+    const positions = ['top', 'right', 'bottom', 'left'] as const;
+    const alignments = ['start', 'center', 'end'] as const;
+
+    for (const position of positions) {
+      for (const align of alignments) {
+        it(`should position correctly with position=${position} and align=${align}`, () => {
+          render(
+            <Popover
+              anchorEl={anchorEl}
+              isOpen={true}
+              position={position}
+              align={align}
+              offset={8}
+            >
+              Content
+            </Popover>,
+          );
+
+          const popover = screen.getByTestId('ockPopover');
+          expect(popover).toBeInTheDocument();
+
+          expect(popover.style.top).toBeDefined();
+          expect(popover.style.left).toBeDefined();
+        });
+      }
+    }
+
+    it('should update position on window resize', async () => {
+      render(
+        <Popover anchorEl={anchorEl} isOpen={true}>
+          Content
+        </Popover>,
+      );
+
+      fireEvent(window, new Event('resize'));
+
+      expect(screen.getByTestId('ockPopover')).toBeInTheDocument();
+    });
+
+    it('should update position on scroll', async () => {
+      render(
+        <Popover anchorEl={anchorEl} isOpen={true}>
+          Content
+        </Popover>,
+      );
+
+      fireEvent.scroll(window);
+
+      expect(screen.getByTestId('ockPopover')).toBeInTheDocument();
+    });
+
+    it('should handle missing getBoundingClientRect gracefully', () => {
+      const originalGetBoundingClientRect =
+        Element.prototype.getBoundingClientRect;
+      Element.prototype.getBoundingClientRect = vi
+        .fn()
+        .mockReturnValue(undefined);
+
+      render(
+        <Popover anchorEl={anchorEl} isOpen={true}>
+          Content
+        </Popover>,
+      );
+
+      const popover = screen.getByTestId('ockPopover');
+      expect(popover).toBeInTheDocument();
+
+      Element.prototype.getBoundingClientRect = originalGetBoundingClientRect;
+    });
+  });
+
+  describe('interactions', () => {
+    it('should not call onClose when clicking inside', async () => {
+      const onClose = vi.fn();
+      render(
+        <Popover anchorEl={anchorEl} isOpen={true} onClose={onClose}>
+          Content
+        </Popover>,
+      );
+
+      fireEvent.mouseDown(screen.getByText('Content'));
+      expect(onClose).not.toHaveBeenCalled();
+    });
+
+    it('should call onClose when pressing Escape', async () => {
+      const onClose = vi.fn();
+      render(
+        <Popover anchorEl={anchorEl} isOpen={true} onClose={onClose}>
+          Content
+        </Popover>,
+      );
+
+      fireEvent.keyDown(document.body, { key: 'Escape' });
+      expect(onClose).toHaveBeenCalled();
+    });
+  });
+
+  describe('accessibility', () => {
+    it('should have correct ARIA attributes', () => {
+      render(
+        <Popover
+          anchorEl={anchorEl}
+          isOpen={true}
+          aria-label="Test Label"
+          aria-labelledby="labelId"
+          aria-describedby="describeId"
+        >
+          Content
+        </Popover>,
+      );
+
+      const popover = screen.getByTestId('ockPopover');
+      expect(popover).toHaveAttribute('role', 'dialog');
+      expect(popover).toHaveAttribute('aria-label', 'Test Label');
+      expect(popover).toHaveAttribute('aria-labelledby', 'labelId');
+      expect(popover).toHaveAttribute('aria-describedby', 'describeId');
+    });
+
+    it('should trap focus when open', async () => {
+      const user = userEvent.setup();
+      render(
+        <Popover anchorEl={anchorEl} isOpen={true}>
+          <button type="button">First</button>
+          <button type="button">Second</button>
+        </Popover>,
+      );
+
+      const firstButton = screen.getByText('First');
+      const secondButton = screen.getByText('Second');
+
+      firstButton.focus();
+      expect(document.activeElement).toBe(firstButton);
+
+      await user.tab();
+      expect(document.activeElement).toBe(secondButton);
+
+      await user.tab();
+      expect(document.activeElement).toBe(firstButton);
+    });
+  });
+
+  describe('cleanup', () => {
+    it('should remove event listeners on unmount', () => {
+      const { unmount } = render(
+        <Popover anchorEl={anchorEl} isOpen={true}>
+          Content
+        </Popover>,
+      );
+
+      const removeEventListenerSpy = vi.spyOn(window, 'removeEventListener');
+      unmount();
+
+      expect(removeEventListenerSpy).toHaveBeenCalledTimes(2);
+    });
+  });
+});