📦 deps(thirdparty): update snapshots

2026-05-29 08:33:53 +00:00
parent fdb52f1e96
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+# Event Handler TypeScript Patterns
+
+Proper event typing ensures type-safe access to event properties and target elements.
+
+## Mouse Events
+
+```typescript
+// Click events
+function handleClick(event: React.MouseEvent<HTMLButtonElement>) {
+  event.preventDefault();
+  event.stopPropagation();
+
+  // Target element typed correctly
+  event.currentTarget.disabled = true;
+  event.currentTarget.textContent = 'Clicked';
+
+  // Mouse position
+  console.log(event.clientX, event.clientY);
+  console.log(event.pageX, event.pageY);
+
+  // Mouse buttons
+  console.log(event.button); // 0 = left, 1 = middle, 2 = right
+  console.log(event.buttons); // Bitmask of pressed buttons
+
+  // Modifier keys
+  if (event.ctrlKey || event.metaKey) {
+    console.log('Ctrl/Cmd + Click');
+  }
+  if (event.shiftKey) {
+    console.log('Shift + Click');
+  }
+  if (event.altKey) {
+    console.log('Alt + Click');
+  }
+}
+
+// Mouse movement
+function handleMouseMove(event: React.MouseEvent<HTMLDivElement>) {
+  const rect = event.currentTarget.getBoundingClientRect();
+  const x = event.clientX - rect.left;
+  const y = event.clientY - rect.top;
+  console.log(`Position in element: ${x}, ${y}`);
+}
+
+// Hover events
+function handleMouseEnter(event: React.MouseEvent<HTMLDivElement>) {
+  event.currentTarget.style.backgroundColor = 'lightblue';
+}
+
+function handleMouseLeave(event: React.MouseEvent<HTMLDivElement>) {
+  event.currentTarget.style.backgroundColor = '';
+}
+
+// Double click
+function handleDoubleClick(event: React.MouseEvent<HTMLElement>) {
+  console.log('Double clicked');
+}
+```
+
+## Form Events
+
+```typescript
+// Form submission
+function handleSubmit(event: React.FormEvent<HTMLFormElement>) {
+  event.preventDefault();
+
+  const form = event.currentTarget;
+  const formData = new FormData(form);
+
+  const data = {
+    name: formData.get('name') as string,
+    email: formData.get('email') as string,
+  };
+
+  console.log(data);
+}
+
+// Input change
+function handleChange(event: React.ChangeEvent<HTMLInputElement>) {
+  const target = event.target;
+
+  // For text inputs
+  if (target.type === 'text' || target.type === 'email') {
+    console.log(target.value); // string
+  }
+
+  // For checkboxes
+  if (target.type === 'checkbox') {
+    console.log(target.checked); // boolean
+  }
+
+  // For radio buttons
+  if (target.type === 'radio') {
+    console.log(target.value, target.checked);
+  }
+
+  // For number inputs
+  if (target.type === 'number') {
+    console.log(target.valueAsNumber); // number
+  }
+
+  // For file inputs
+  if (target.type === 'file') {
+    const files = target.files; // FileList | null
+    if (files && files.length > 0) {
+      console.log(files[0].name);
+    }
+  }
+}
+
+// Textarea change
+function handleTextareaChange(event: React.ChangeEvent<HTMLTextAreaElement>) {
+  console.log(event.target.value);
+  console.log(event.target.selectionStart); // Cursor position
+}
+
+// Select change
+function handleSelectChange(event: React.ChangeEvent<HTMLSelectElement>) {
+  const value = event.target.value;
+  const selectedIndex = event.target.selectedIndex;
+  const selectedOption = event.target.options[selectedIndex];
+  console.log(value, selectedOption.text);
+}
+
+// Input events (fires on every keystroke)
+function handleInput(event: React.FormEvent<HTMLInputElement>) {
+  console.log(event.currentTarget.value);
+}
+
+// Reset event
+function handleReset(event: React.FormEvent<HTMLFormElement>) {
+  event.preventDefault();
+  console.log('Form reset');
+}
+```
+
+## Keyboard Events
+
+```typescript
+function handleKeyDown(event: React.KeyboardEvent<HTMLInputElement>) {
+  // Key identification
+  console.log(event.key); // 'Enter', 'Escape', 'a', etc.
+  console.log(event.code); // 'Enter', 'Escape', 'KeyA', etc.
+
+  // Common patterns
+  if (event.key === 'Enter') {
+    event.preventDefault();
+    console.log('Enter pressed');
+  }
+
+  if (event.key === 'Escape') {
+    event.currentTarget.blur();
+  }
+
+  // Arrow keys
+  if (event.key === 'ArrowUp') {
+    event.preventDefault();
+    // Navigate up
+  }
+
+  // Modifier keys
+  if (event.ctrlKey && event.key === 's') {
+    event.preventDefault();
+    console.log('Ctrl+S - Save');
+  }
+
+  if (event.metaKey && event.key === 'k') {
+    event.preventDefault();
+    console.log('Cmd+K - Search');
+  }
+
+  // Check multiple modifiers
+  if (event.ctrlKey && event.shiftKey && event.key === 'P') {
+    event.preventDefault();
+    console.log('Ctrl+Shift+P - Command palette');
+  }
+
+  // Key combinations
+  if ((event.ctrlKey || event.metaKey) && event.key === 'Enter') {
+    console.log('Submit with Ctrl/Cmd+Enter');
+  }
+}
+
+function handleKeyUp(event: React.KeyboardEvent<HTMLInputElement>) {
+  console.log('Key released:', event.key);
+}
+
+function handleKeyPress(event: React.KeyboardEvent<HTMLInputElement>) {
+  // Deprecated - use keyDown instead
+  console.log('Key pressed:', event.key);
+}
+```
+
+## Focus Events
+
+```typescript
+function handleFocus(event: React.FocusEvent<HTMLInputElement>) {
+  // Select all text on focus
+  event.target.select();
+
+  // Add visual indicator
+  event.currentTarget.classList.add('focused');
+}
+
+function handleBlur(event: React.FocusEvent<HTMLInputElement>) {
+  // Validate on blur
+  const value = event.target.value;
+  if (value === '') {
+    event.currentTarget.classList.add('error');
+  }
+
+  // Remove visual indicator
+  event.currentTarget.classList.remove('focused');
+}
+
+// Focus within
+function handleFocusWithin(event: React.FocusEvent<HTMLDivElement>) {
+  // Related target - element receiving focus
+  const relatedTarget = event.relatedTarget as HTMLElement | null;
+  console.log('Focus moved from:', relatedTarget);
+}
+```
+
+## Drag and Drop Events
+
+```typescript
+function handleDragStart(event: React.DragEvent<HTMLDivElement>) {
+  event.dataTransfer.effectAllowed = 'move';
+  event.dataTransfer.setData('text/plain', event.currentTarget.id);
+
+  // Custom drag image
+  const dragImage = document.createElement('div');
+  dragImage.textContent = 'Dragging...';
+  event.dataTransfer.setDragImage(dragImage, 0, 0);
+}
+
+function handleDragOver(event: React.DragEvent<HTMLDivElement>) {
+  event.preventDefault();
+  event.dataTransfer.dropEffect = 'move';
+  event.currentTarget.classList.add('drag-over');
+}
+
+function handleDragLeave(event: React.DragEvent<HTMLDivElement>) {
+  event.currentTarget.classList.remove('drag-over');
+}
+
+function handleDrop(event: React.DragEvent<HTMLDivElement>) {
+  event.preventDefault();
+  event.currentTarget.classList.remove('drag-over');
+
+  const data = event.dataTransfer.getData('text/plain');
+  console.log('Dropped:', data);
+
+  // Handle files
+  const files = event.dataTransfer.files;
+  if (files.length > 0) {
+    Array.from(files).forEach((file) => {
+      console.log(file.name, file.type, file.size);
+    });
+  }
+}
+
+function handleDragEnd(event: React.DragEvent<HTMLDivElement>) {
+  console.log('Drag ended');
+}
+```
+
+## Clipboard Events
+
+```typescript
+function handleCopy(event: React.ClipboardEvent<HTMLDivElement>) {
+  event.preventDefault();
+
+  // Custom copy behavior
+  const selection = window.getSelection();
+  if (selection) {
+    const text = `Copied from app: ${selection.toString()}`;
+    event.clipboardData.setData('text/plain', text);
+  }
+}
+
+function handleCut(event: React.ClipboardEvent<HTMLInputElement>) {
+  console.log('Cut:', event.currentTarget.value);
+}
+
+function handlePaste(event: React.ClipboardEvent<HTMLInputElement>) {
+  event.preventDefault();
+
+  const pastedText = event.clipboardData.getData('text/plain');
+  console.log('Pasted:', pastedText);
+
+  // Validate pasted content
+  const sanitized = pastedText.replace(/[^a-zA-Z0-9]/g, '');
+  event.currentTarget.value = sanitized;
+}
+```
+
+## Composition Events (IME)
+
+```typescript
+// For international input methods (Chinese, Japanese, etc.)
+function handleCompositionStart(event: React.CompositionEvent<HTMLInputElement>) {
+  console.log('Composition started');
+}
+
+function handleCompositionUpdate(event: React.CompositionEvent<HTMLInputElement>) {
+  console.log('Composing:', event.data);
+}
+
+function handleCompositionEnd(event: React.CompositionEvent<HTMLInputElement>) {
+  console.log('Composition ended:', event.data);
+}
+```
+
+## Touch Events
+
+```typescript
+function handleTouchStart(event: React.TouchEvent<HTMLDivElement>) {
+  const touch = event.touches[0];
+  console.log('Touch start:', touch.clientX, touch.clientY);
+}
+
+function handleTouchMove(event: React.TouchEvent<HTMLDivElement>) {
+  event.preventDefault(); // Prevent scrolling
+
+  const touch = event.touches[0];
+  console.log('Touch move:', touch.clientX, touch.clientY);
+}
+
+function handleTouchEnd(event: React.TouchEvent<HTMLDivElement>) {
+  console.log('Touch ended');
+}
+
+// Multi-touch
+function handleMultiTouch(event: React.TouchEvent<HTMLDivElement>) {
+  if (event.touches.length === 2) {
+    const [touch1, touch2] = event.touches;
+
+    const distance = Math.hypot(
+      touch2.clientX - touch1.clientX,
+      touch2.clientY - touch1.clientY
+    );
+
+    console.log('Pinch distance:', distance);
+  }
+}
+```
+
+## Wheel Events
+
+```typescript
+function handleWheel(event: React.WheelEvent<HTMLDivElement>) {
+  // Prevent default scroll
+  event.preventDefault();
+
+  // Scroll delta
+  console.log('Delta X:', event.deltaX);
+  console.log('Delta Y:', event.deltaY);
+  console.log('Delta Z:', event.deltaZ);
+
+  // Delta mode (0 = pixels, 1 = lines, 2 = pages)
+  console.log('Delta mode:', event.deltaMode);
+
+  // Zoom with Ctrl+Wheel
+  if (event.ctrlKey) {
+    const zoomDelta = event.deltaY > 0 ? -0.1 : 0.1;
+    console.log('Zoom:', zoomDelta);
+  }
+}
+```
+
+## Generic Event Handlers
+
+Reusable handlers with proper typing.
+
+```typescript
+// Generic change handler
+function createChangeHandler<T extends HTMLElement>(
+  callback: (value: string) => void
+) {
+  return (event: React.ChangeEvent<T>) => {
+    if ('value' in event.target) {
+      callback(event.target.value);
+    }
+  };
+}
+
+// Usage
+const handleNameChange = createChangeHandler<HTMLInputElement>((value) => {
+  setName(value);
+});
+
+const handleBioChange = createChangeHandler<HTMLTextAreaElement>((value) => {
+  setBio(value);
+});
+
+// Generic click handler with target validation
+function createClickHandler<T extends HTMLElement>(
+  selector: string,
+  callback: (element: T) => void
+) {
+  return (event: React.MouseEvent<HTMLElement>) => {
+    const target = event.target as HTMLElement;
+    const match = target.closest(selector);
+
+    if (match) {
+      callback(match as T);
+    }
+  };
+}
+
+// Usage
+const handleItemClick = createClickHandler<HTMLLIElement>('li[data-id]', (item) => {
+  const id = item.dataset.id;
+  console.log('Clicked item:', id);
+});
+```
+
+## Event Handler Type Aliases
+
+```typescript
+// Create reusable type aliases
+type InputChangeHandler = React.ChangeEventHandler<HTMLInputElement>;
+type ButtonClickHandler = React.MouseEventHandler<HTMLButtonElement>;
+type FormSubmitHandler = React.FormEventHandler<HTMLFormElement>;
+
+// Usage
+const handleChange: InputChangeHandler = (event) => {
+  console.log(event.target.value);
+};
+
+const handleClick: ButtonClickHandler = (event) => {
+  event.currentTarget.disabled = true;
+};
+
+const handleSubmit: FormSubmitHandler = (event) => {
+  event.preventDefault();
+};
+
+// Generic handler type
+type EventHandler<E extends HTMLElement, Evt extends React.SyntheticEvent> = (
+  event: Evt & { currentTarget: E }
+) => void;
+
+// Usage
+const handleInput: EventHandler<HTMLInputElement, React.ChangeEvent<HTMLInputElement>> = (
+  event
+) => {
+  console.log(event.currentTarget.value);
+};
+```
+
+## Delegated Event Handlers
+
+Type-safe event delegation.
+
+```typescript
+function ListContainer() {
+  const handleListClick = (event: React.MouseEvent<HTMLUListElement>) => {
+    const target = event.target as HTMLElement;
+
+    // Find clicked list item
+    const listItem = target.closest('li');
+    if (!listItem) return;
+
+    // Type guard for data attributes
+    const itemId = listItem.getAttribute('data-id');
+    if (itemId) {
+      console.log('Clicked item:', itemId);
+    }
+
+    // Handle button within list item
+    if (target.matches('button.delete')) {
+      event.stopPropagation();
+      console.log('Delete clicked');
+    }
+  };
+
+  return (
+    <ul onClick={handleListClick}>
+      <li data-id="1">
+        Item 1<button className="delete">Delete</button>
+      </li>
+      <li data-id="2">
+        Item 2<button className="delete">Delete</button>
+      </li>
+    </ul>
+  );
+}
+```
+
+## Native vs Synthetic Events
+
+```typescript
+function Component() {
+  const ref = useRef<HTMLDivElement>(null);
+
+  useEffect(() => {
+    const element = ref.current;
+    if (!element) return;
+
+    // Native event listener
+    const handleNativeClick = (event: MouseEvent) => {
+      console.log('Native click:', event.target);
+    };
+
+    element.addEventListener('click', handleNativeClick);
+
+    return () => {
+      element.removeEventListener('click', handleNativeClick);
+    };
+  }, []);
+
+  // React synthetic event
+  const handleReactClick = (event: React.MouseEvent<HTMLDivElement>) => {
+    console.log('React click:', event.target);
+
+    // Access native event
+    const nativeEvent = event.nativeEvent;
+    console.log('Native event:', nativeEvent);
+  };
+
+  return <div ref={ref} onClick={handleReactClick}>Click me</div>;
+}
+```
+
+## Custom Events
+
+```typescript
+// Define custom event type
+type CustomEventMap = {
+  'user:login': CustomEvent<{ userId: string }>;
+  'user:logout': CustomEvent;
+};
+
+// Typed custom event dispatcher
+function dispatchCustomEvent<K extends keyof CustomEventMap>(
+  element: HTMLElement,
+  type: K,
+  detail?: CustomEventMap[K]['detail']
+) {
+  const event = new CustomEvent(type, { detail, bubbles: true });
+  element.dispatchEvent(event);
+}
+
+// Component using custom events
+function UserButton() {
+  const ref = useRef<HTMLButtonElement>(null);
+
+  const handleLogin = () => {
+    if (ref.current) {
+      dispatchCustomEvent(ref.current, 'user:login', { userId: '123' });
+    }
+  };
+
+  useEffect(() => {
+    const element = ref.current;
+    if (!element) return;
+
+    const handleCustomLogin = (event: Event) => {
+      const customEvent = event as CustomEvent<{ userId: string }>;
+      console.log('User logged in:', customEvent.detail.userId);
+    };
+
+    element.addEventListener('user:login', handleCustomLogin);
+
+    return () => {
+      element.removeEventListener('user:login', handleCustomLogin);
+    };
+  }, []);
+
+  return <button ref={ref} onClick={handleLogin}>Login</button>;
+}
+```