Briefly display a tick after copying an annotation share URL

src/components/AnnotationShareControl.tsx

@@ -1,4 +1,5 @@
 import {
+  CheckIcon,
   CopyIcon,
   IconButton,
   Input,
@@ -11,6 +12,7 @@ import { useCallback, useEffect, useRef, useState } from 'preact/hooks';
 import type { Group } from '../helpers';
 import type { Annotation } from '../helpers/annotation-metadata';
 import { isPrivate } from '../helpers/permissions';
+import { useTimeout } from '../hooks/use-timeout';
 import type { Result } from '../utils/types';
 import { isIOS } from '../utils/user-agent';
 
@@ -75,14 +77,18 @@ export default function AnnotationShareControl({
   const [isOpen, setOpen] = useState(false);
   const wasOpen = useRef(isOpen);
 
+  const [copied, setCopied] = useState(false);
+  const setTimeout = useTimeout();
   const copyShareLink = useCallback(async () => {
     try {
       await navigator.clipboard.writeText(shareURI!);
+      setCopied(true);
+      setTimeout(() => setCopied(false), 1500);
       onCopy?.({ ok: true, value: shareURI! });
     } catch (error: any) {
       onCopy?.({ ok: false, error });
     }
-  }, [onCopy, shareURI]);
+  }, [onCopy, setTimeout, shareURI]);
 
   const toggleSharePanel = () => setOpen(prev => !prev);
 
@@ -160,7 +166,7 @@ export default function AnnotationShareControl({
                 elementRef={inputRef}
               />
               <IconButton
-                icon={CopyIcon}
+                icon={copied ? CheckIcon : CopyIcon}
                 title="Copy share link to clipboard"
                 onClick={copyShareLink}
                 variant="dark"

src/components/test/AnnotationShareControl-test.js

@@ -1,5 +1,6 @@
 import {
   checkAccessibility,
+  delay,
   mockImportedComponents,
 } from '@hypothesis/frontend-testing';
 import { mount } from '@hypothesis/frontend-testing';
@@ -13,6 +14,7 @@ describe('AnnotationShareControl', () => {
   let fakeGroup;
   let fakeIsPrivate;
   let fakeIsIOS;
+  let fakeUseTimeout;
 
   const getIconButton = (wrapper, iconName) => {
     return wrapper
@@ -63,10 +65,17 @@ describe('AnnotationShareControl', () => {
     fakeIsPrivate = sinon.stub().returns(false);
     fakeIsIOS = sinon.stub().returns(false);
 
+    fakeUseTimeout = sinon
+      .stub()
+      .returns(sinon.stub().callsFake(callback => setTimeout(callback, 0)));
+
     $imports.$mock(mockImportedComponents());
     $imports.$mock({
       '../helpers/permissions': { isPrivate: fakeIsPrivate },
       '../utils/user-agent': { isIOS: fakeIsIOS },
+      '../hooks/use-timeout': {
+        useTimeout: fakeUseTimeout,
+      },
     });
   });
 
@@ -147,6 +156,24 @@ describe('AnnotationShareControl', () => {
 
       assert.calledWith(onCopy, { ok: false, error });
     });
+
+    it('replaces copy icon with check and eventually goes back to the copy icon', async () => {
+      const wrapper = createComponent({ onCopy });
+      openElement(wrapper);
+
+      await getIconButton(wrapper, 'CopyIcon').props().onClick();
+      wrapper.update();
+
+      assert.isTrue(getIconButton(wrapper, 'CheckIcon').exists());
+      assert.isFalse(getIconButton(wrapper, 'CopyIcon').exists());
+
+      // Once the timeout clears, the copy icon will be restored
+      await delay(0);
+      wrapper.update();
+
+      assert.isFalse(getIconButton(wrapper, 'CheckIcon').exists());
+      assert.isTrue(getIconButton(wrapper, 'CopyIcon').exists());
+    });
   });
 
   [

src/hooks/test/use-timeout-test.js

@@ -0,0 +1,50 @@
+import { delay, mount } from '@hypothesis/frontend-testing';
+import sinon from 'sinon';
+
+import { useTimeout } from '../use-timeout';
+
+describe('useTimeout', () => {
+  let fakeSetTimeout;
+  let fakeClearTimeout;
+  let currentSetTimeout;
+
+  beforeEach(() => {
+    fakeSetTimeout = sinon
+      .stub()
+      .callsFake(callback => setTimeout(callback, 0));
+    fakeClearTimeout = sinon.stub();
+    currentSetTimeout = undefined;
+  });
+
+  function TestComponent() {
+    currentSetTimeout = useTimeout(fakeSetTimeout, fakeClearTimeout);
+    return null;
+  }
+
+  function createComponent() {
+    return mount(<TestComponent />);
+  }
+
+  it('calls setTimeout when returned setTimeout-like callback is invoked', async () => {
+    const callback = sinon.stub();
+    createComponent();
+
+    assert.notCalled(fakeSetTimeout);
+    currentSetTimeout(callback, 500);
+    assert.calledWith(fakeSetTimeout, sinon.match.func, 500);
+
+    // The callback passed to the timeout will also be called after the timeout
+    await delay(0);
+    assert.called(callback);
+  });
+
+  it('clears current timeout when unmounted', () => {
+    fakeSetTimeout.returns(1);
+    const wrapper = createComponent();
+
+    currentSetTimeout(sinon.stub(), 500);
+
+    wrapper.unmount();
+    assert.called(fakeClearTimeout);
+  });
+});

src/hooks/use-timeout.ts

@@ -0,0 +1,38 @@
+import { useCallback, useEffect, useRef } from 'preact/hooks';
+
+/**
+ * Returns a setTimeout-compatible stable function, which automatically clears
+ * the previously scheduled callback every time it's called.
+ *
+ * The timeout instance is not returned, as the hook internally handles
+ * clearing it.
+ */
+export function useTimeout(
+  /* istanbul ignore next - test seam */
+  setTimeout_: typeof setTimeout = setTimeout,
+  /* istanbul ignore next - test seam */
+  clearTimeout_: typeof clearTimeout = clearTimeout,
+): (callback: () => void, delay: number) => void {
+  const timeoutRef = useRef<ReturnType<typeof setTimeout_> | null>(null);
+  const clearCurrentTimeout = useCallback(() => {
+    if (timeoutRef.current) {
+      clearTimeout_(timeoutRef.current);
+    }
+  }, [clearTimeout_]);
+
+  // When unmounted, clear the last timeout, if any
+  useEffect(() => {
+    return clearCurrentTimeout;
+  }, [clearCurrentTimeout]);
+
+  return useCallback(
+    (callback, delay) => {
+      clearCurrentTimeout();
+      timeoutRef.current = setTimeout_(() => {
+        callback();
+        timeoutRef.current = null;
+      }, delay);
+    },
+    [clearCurrentTimeout, setTimeout_],
+  );
+}