Implement a useDoubleClick React Hook
Create a custom React hook, useDoubleClick, that simplifies handling double-click events on an element. This hook should abstract away the logic for tracking clicks and identifying when a double-click has occurred, making it easier to implement double-click functionalities in your React applications.
Problem Description
Your task is to implement a custom React hook named useDoubleClick. This hook will take a callback function as an argument, which will be executed only when a double-click event is detected on the element where the hook's returned event handler is attached.
Key Requirements:
- The hook should accept a single argument:
callback(a function that takes no arguments and returnsvoid). - The hook should return a single value: an event handler function (
(event: React.MouseEvent<Element>) => void). This function should be attached to theonClickprop of a DOM element. - The
callbackfunction should only be invoked when theonClickhandler is triggered twice in quick succession within a predefined time window. - The hook should manage the internal state required to track clicks and their timestamps.
- The hook should be written in TypeScript.
Expected Behavior:
When the returned onClick handler is invoked:
- The hook checks if a previous click occurred recently.
- If a previous click occurred within the double-click time threshold, and the current click is also within that threshold of the previous one, the
callbackfunction is executed. - If it's the first click or if the time between clicks exceeds the threshold, the hook records the current click's timestamp and waits for the next click.
- Any clicks after a successful double-click should reset the state, waiting for a new sequence.
Edge Cases to Consider:
- Rapid successive clicks: Ensure the logic correctly distinguishes between single clicks, double clicks, and more than two rapid clicks.
- Timeouts: What happens if a click occurs, but the second click doesn't happen within the time threshold? The hook should reset and wait for a new first click.
- Unmounting: Ensure no memory leaks occur if the component using the hook unmounts before a double-click is registered.
Examples
Example 1: Basic Double Click
Imagine a button that logs a message to the console when double-clicked.
- Input to hook:
callback = () => console.log('Double clicked!'); - Usage:
const handleClick = useDoubleClick(() => console.log('Double clicked!')); return ( <button onClick={handleClick}>Double Click Me</button> ); - Behavior:
- User clicks the button once. Nothing happens immediately.
- User clicks the button again within the time threshold.
- Output:
'Double clicked!'is logged to the console. - If the user waits too long between the first and second click, the first click is effectively ignored for the purpose of a double-click, and a new sequence starts.
Example 2: State Update on Double Click
A component that toggles a boolean state when an element is double-clicked.
- Input to hook:
callback = () => setIsToggled(prev => !prev); - Usage:
const [isToggled, setIsToggled] = useState(false); const handleDoubleClick = useDoubleClick(() => setIsToggled(prev => !prev)); return ( <div onClick={handleDoubleClick} style={{ padding: '20px', border: '1px solid black' }}> Double click this area. Current state: {isToggled ? 'ON' : 'OFF'} </div> ); - Behavior:
- User clicks the div once. Nothing visible changes.
- User double-clicks the div within the time threshold.
- Output: The text "Current state: ON" or "Current state: OFF" visibly updates.
Example 3: Handling Consecutive Double Clicks
Demonstrates how consecutive double clicks are handled.
- Input to hook:
callback = () => console.log('Double click detected!'); - Usage: Same as Example 1.
- Behavior:
- User double-clicks the button.
- Output:
'Double click detected!'is logged. - Immediately after the first double-click is processed, the hook resets its internal state.
- If the user double-clicks the button again very quickly, it will be treated as a new, separate double-click event.
Constraints
- The double-click time threshold is a configurable internal detail of the hook, but a reasonable default (e.g., 300-500 milliseconds) should be assumed for implementation. For the purpose of this challenge, you can hardcode this value within the hook.
- The hook should not rely on any external libraries.
- The solution must be in TypeScript.
- The
callbackfunction should be stable and not be recreated on every render if the component itself re-renders unnecessarily. Consider usinguseCallbackwithin the hook.
Notes
- Consider using
useRefto store the timer ID and the last click timestamp, as these values need to persist across renders without causing re-renders themselves. - Remember to clear any active timers when the component unmounts to prevent memory leaks. The
useEffecthook with a cleanup function is ideal for this. - The event handler returned by the hook will receive a
React.MouseEventobject, which you can use if your callback needs access to event details, though the core requirement is to trigger the callback itself.