| 1 | /** |
| 2 | * Copyright (c) Meta Platforms, Inc. and affiliates. |
| 3 | * |
| 4 | * This source code is licensed under the MIT license found in the |
| 5 | * LICENSE file in the root directory of this source tree. |
| 6 | * |
| 7 | * @flow |
| 8 | */ |
| 9 | |
| 10 | /* eslint valid-typeof: 0 */ |
| 11 | |
| 12 | import type {Fiber} from 'react-reconciler/src/ReactInternalTypes'; |
| 13 | |
| 14 | import assign from 'shared/assign'; |
| 15 | import getEventCharCode from './getEventCharCode'; |
| 16 | |
| 17 | type EventInterfaceType = { |
| 18 | [propName: string]: 0 | ((event: {[propName: string]: mixed, ...}) => mixed), |
| 19 | }; |
| 20 | |
| 21 | function functionThatReturnsTrue() { |
| 22 | return true; |
| 23 | } |
| 24 | |
| 25 | function functionThatReturnsFalse() { |
| 26 | return false; |
| 27 | } |
| 28 | |
| 29 | // This is intentionally a factory so that we have different returned constructors. |
| 30 | // If we had a single constructor, it would be megamorphic and engines would deopt. |
| 31 | function createSyntheticEvent(Interface: EventInterfaceType) { |
| 32 | /** |
| 33 | * Synthetic events are dispatched by event plugins, typically in response to a |
| 34 | * top-level event delegation handler. |
| 35 | * |
| 36 | * These systems should generally use pooling to reduce the frequency of garbage |
| 37 | * collection. The system should check `isPersistent` to determine whether the |
| 38 | * event should be released into the pool after being dispatched. Users that |
| 39 | * need a persisted event should invoke `persist`. |
| 40 | * |
| 41 | * Synthetic events (and subclasses) implement the DOM Level 3 Events API by |
| 42 | * normalizing browser quirks. Subclasses do not necessarily have to implement a |
| 43 | * DOM interface; custom application-specific events can also subclass this. |
| 44 | */ |
| 45 | // $FlowFixMe[missing-this-annot] |
| 46 | function SyntheticBaseEvent( |
| 47 | reactName: string | null, |
| 48 | reactEventType: string, |
| 49 | targetInst: Fiber | null, |
| 50 | nativeEvent: {[propName: string]: mixed, ...}, |
| 51 | nativeEventTarget: null | EventTarget, |
| 52 | ) { |
| 53 | this._reactName = reactName; |
| 54 | this._targetInst = targetInst; |
| 55 | this.type = reactEventType; |
| 56 | this.nativeEvent = nativeEvent; |
| 57 | this.target = nativeEventTarget; |
| 58 | this.currentTarget = null; |
| 59 | |
| 60 | for (const propName in Interface) { |
| 61 | if (!Interface.hasOwnProperty(propName)) { |
| 62 | continue; |
| 63 | } |
| 64 | const normalize = Interface[propName]; |
| 65 | if (normalize) { |
| 66 | this[propName] = normalize(nativeEvent); |
| 67 | } else { |
| 68 | this[propName] = nativeEvent[propName]; |
| 69 | } |
| 70 | } |
| 71 | |
| 72 | const defaultPrevented = |
| 73 | nativeEvent.defaultPrevented != null |
| 74 | ? nativeEvent.defaultPrevented |
| 75 | : nativeEvent.returnValue === false; |
| 76 | if (defaultPrevented) { |
| 77 | this.isDefaultPrevented = functionThatReturnsTrue; |
| 78 | } else { |
| 79 | this.isDefaultPrevented = functionThatReturnsFalse; |
| 80 | } |
| 81 | this.isPropagationStopped = functionThatReturnsFalse; |
| 82 | return this; |
| 83 | } |
| 84 | |
| 85 | // $FlowFixMe[prop-missing] found when upgrading Flow |
| 86 | assign(SyntheticBaseEvent.prototype, { |
| 87 | // $FlowFixMe[missing-this-annot] |
| 88 | preventDefault: function () { |
| 89 | this.defaultPrevented = true; |
| 90 | const event = this.nativeEvent; |
| 91 | if (!event) { |
| 92 | return; |
| 93 | } |
| 94 | |
| 95 | if (event.preventDefault) { |
| 96 | event.preventDefault(); |
| 97 | // $FlowFixMe[illegal-typeof] - flow is not aware of `unknown` in IE |
| 98 | } else if (typeof event.returnValue !== 'unknown') { |
| 99 | event.returnValue = false; |
| 100 | } |
| 101 | this.isDefaultPrevented = functionThatReturnsTrue; |
| 102 | }, |
| 103 | |
| 104 | // $FlowFixMe[missing-this-annot] |
| 105 | stopPropagation: function () { |
| 106 | const event = this.nativeEvent; |
| 107 | if (!event) { |
| 108 | return; |
| 109 | } |
| 110 | |
| 111 | if (event.stopPropagation) { |
| 112 | event.stopPropagation(); |
| 113 | // $FlowFixMe[illegal-typeof] - flow is not aware of `unknown` in IE |
| 114 | } else if (typeof event.cancelBubble !== 'unknown') { |
| 115 | // The ChangeEventPlugin registers a "propertychange" event for |
| 116 | // IE. This event does not support bubbling or cancelling, and |
| 117 | // any references to cancelBubble throw "Member not found". A |
| 118 | // typeof check of "unknown" circumvents this issue (and is also |
| 119 | // IE specific). |
| 120 | event.cancelBubble = true; |
| 121 | } |
| 122 | |
| 123 | this.isPropagationStopped = functionThatReturnsTrue; |
| 124 | }, |
| 125 | |
| 126 | /** |
| 127 | * We release all dispatched `SyntheticEvent`s after each event loop, adding |
| 128 | * them back into the pool. This allows a way to hold onto a reference that |
| 129 | * won't be added back into the pool. |
| 130 | */ |
| 131 | persist: function () { |
| 132 | // Modern event system doesn't use pooling. |
| 133 | }, |
| 134 | |
| 135 | /** |
| 136 | * Checks if this event should be released back into the pool. |
| 137 | * |
| 138 | * @return {boolean} True if this should not be released, false otherwise. |
| 139 | */ |
| 140 | isPersistent: functionThatReturnsTrue, |
| 141 | }); |
| 142 | return SyntheticBaseEvent; |
| 143 | } |
| 144 | |
| 145 | /** |
| 146 | * @interface Event |
| 147 | * @see http://www.w3.org/TR/DOM-Level-3-Events/ |
| 148 | */ |
| 149 | const EventInterface: EventInterfaceType = { |
| 150 | eventPhase: 0, |
| 151 | bubbles: 0, |
| 152 | cancelable: 0, |
| 153 | timeStamp: function (event: {[propName: string]: mixed}) { |
| 154 | return event.timeStamp || Date.now(); |
| 155 | }, |
| 156 | defaultPrevented: 0, |
| 157 | isTrusted: 0, |
| 158 | }; |
| 159 | export const SyntheticEvent: $FlowFixMe = createSyntheticEvent(EventInterface); |
| 160 | |
| 161 | const UIEventInterface: EventInterfaceType = { |
| 162 | ...EventInterface, |
| 163 | view: 0, |
| 164 | detail: 0, |
| 165 | }; |
| 166 | export const SyntheticUIEvent: $FlowFixMe = |
| 167 | createSyntheticEvent(UIEventInterface); |
| 168 | |
| 169 | let lastMovementX; |
| 170 | let lastMovementY; |
| 171 | let lastMouseEvent: ?{[propName: string]: mixed}; |
| 172 | |
| 173 | function updateMouseMovementPolyfillState(event: {[propName: string]: mixed}) { |
| 174 | if (event !== lastMouseEvent) { |
| 175 | if (lastMouseEvent && event.type === 'mousemove') { |
| 176 | // $FlowFixMe[unsafe-arithmetic] assuming this is a number |
| 177 | lastMovementX = event.screenX - lastMouseEvent.screenX; |
| 178 | // $FlowFixMe[unsafe-arithmetic] assuming this is a number |
| 179 | lastMovementY = event.screenY - lastMouseEvent.screenY; |
| 180 | } else { |
| 181 | lastMovementX = 0; |
| 182 | lastMovementY = 0; |
| 183 | } |
| 184 | lastMouseEvent = event; |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * @interface MouseEvent |
| 190 | * @see http://www.w3.org/TR/DOM-Level-3-Events/ |
| 191 | */ |
| 192 | const MouseEventInterface: EventInterfaceType = { |
| 193 | ...UIEventInterface, |
| 194 | screenX: 0, |
| 195 | screenY: 0, |
| 196 | clientX: 0, |
| 197 | clientY: 0, |
| 198 | pageX: 0, |
| 199 | pageY: 0, |
| 200 | ctrlKey: 0, |
| 201 | shiftKey: 0, |
| 202 | altKey: 0, |
| 203 | metaKey: 0, |
| 204 | getModifierState: getEventModifierState, |
| 205 | button: 0, |
| 206 | buttons: 0, |
| 207 | relatedTarget: function (event) { |
| 208 | if (event.relatedTarget === undefined) |
| 209 | return event.fromElement === event.srcElement |
| 210 | ? event.toElement |
| 211 | : event.fromElement; |
| 212 | |
| 213 | return event.relatedTarget; |
| 214 | }, |
| 215 | movementX: function (event) { |
| 216 | if ('movementX' in event) { |
| 217 | return event.movementX; |
| 218 | } |
| 219 | updateMouseMovementPolyfillState(event); |
| 220 | return lastMovementX; |
| 221 | }, |
| 222 | movementY: function (event) { |
| 223 | if ('movementY' in event) { |
| 224 | return event.movementY; |
| 225 | } |
| 226 | // Don't need to call updateMouseMovementPolyfillState() here |
| 227 | // because it's guaranteed to have already run when movementX |
| 228 | // was copied. |
| 229 | return lastMovementY; |
| 230 | }, |
| 231 | }; |
| 232 | |
| 233 | export const SyntheticMouseEvent: $FlowFixMe = |
| 234 | createSyntheticEvent(MouseEventInterface); |
| 235 | |
| 236 | /** |
| 237 | * @interface DragEvent |
| 238 | * @see http://www.w3.org/TR/DOM-Level-3-Events/ |
| 239 | */ |
| 240 | const DragEventInterface: EventInterfaceType = { |
| 241 | ...MouseEventInterface, |
| 242 | dataTransfer: 0, |
| 243 | }; |
| 244 | export const SyntheticDragEvent: $FlowFixMe = |
| 245 | createSyntheticEvent(DragEventInterface); |
| 246 | |
| 247 | /** |
| 248 | * @interface FocusEvent |
| 249 | * @see http://www.w3.org/TR/DOM-Level-3-Events/ |
| 250 | */ |
| 251 | const FocusEventInterface: EventInterfaceType = { |
| 252 | ...UIEventInterface, |
| 253 | relatedTarget: 0, |
| 254 | }; |
| 255 | export const SyntheticFocusEvent: $FlowFixMe = |
| 256 | createSyntheticEvent(FocusEventInterface); |
| 257 | |
| 258 | /** |
| 259 | * @interface Event |
| 260 | * @see http://www.w3.org/TR/css3-animations/#AnimationEvent-interface |
| 261 | * @see https://developer.mozilla.org/en-US/docs/Web/API/AnimationEvent |
| 262 | */ |
| 263 | const AnimationEventInterface: EventInterfaceType = { |
| 264 | ...EventInterface, |
| 265 | animationName: 0, |
| 266 | elapsedTime: 0, |
| 267 | pseudoElement: 0, |
| 268 | }; |
| 269 | export const SyntheticAnimationEvent: $FlowFixMe = createSyntheticEvent( |
| 270 | AnimationEventInterface, |
| 271 | ); |
| 272 | |
| 273 | /** |
| 274 | * @interface Event |
| 275 | * @see http://www.w3.org/TR/clipboard-apis/ |
| 276 | */ |
| 277 | const ClipboardEventInterface: EventInterfaceType = { |
| 278 | ...EventInterface, |
| 279 | clipboardData: function (event) { |
| 280 | return 'clipboardData' in event |
| 281 | ? event.clipboardData |
| 282 | : window.clipboardData; |
| 283 | }, |
| 284 | }; |
| 285 | export const SyntheticClipboardEvent: $FlowFixMe = createSyntheticEvent( |
| 286 | ClipboardEventInterface, |
| 287 | ); |
| 288 | |
| 289 | /** |
| 290 | * @interface Event |
| 291 | * @see http://www.w3.org/TR/DOM-Level-3-Events/#events-compositionevents |
| 292 | */ |
| 293 | const CompositionEventInterface: EventInterfaceType = { |
| 294 | ...EventInterface, |
| 295 | data: 0, |
| 296 | }; |
| 297 | export const SyntheticCompositionEvent: $FlowFixMe = createSyntheticEvent( |
| 298 | CompositionEventInterface, |
| 299 | ); |
| 300 | |
| 301 | /** |
| 302 | * @interface Event |
| 303 | * @see http://www.w3.org/TR/2013/WD-DOM-Level-3-Events-20131105 |
| 304 | * /#events-inputevents |
| 305 | */ |
| 306 | // Happens to share the same list for now. |
| 307 | export const SyntheticInputEvent = SyntheticCompositionEvent; |
| 308 | |
| 309 | /** |
| 310 | * Normalization of deprecated HTML5 `key` values |
| 311 | * @see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent#Key_names |
| 312 | */ |
| 313 | const normalizeKey = { |
| 314 | Esc: 'Escape', |
| 315 | Spacebar: ' ', |
| 316 | Left: 'ArrowLeft', |
| 317 | Up: 'ArrowUp', |
| 318 | Right: 'ArrowRight', |
| 319 | Down: 'ArrowDown', |
| 320 | Del: 'Delete', |
| 321 | Win: 'OS', |
| 322 | Menu: 'ContextMenu', |
| 323 | Apps: 'ContextMenu', |
| 324 | Scroll: 'ScrollLock', |
| 325 | MozPrintableKey: 'Unidentified', |
| 326 | }; |
| 327 | |
| 328 | /** |
| 329 | * Translation from legacy `keyCode` to HTML5 `key` |
| 330 | * Only special keys supported, all others depend on keyboard layout or browser |
| 331 | * @see https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent#Key_names |
| 332 | */ |
| 333 | const translateToKey = { |
| 334 | '8': 'Backspace', |
| 335 | '9': 'Tab', |
| 336 | '12': 'Clear', |
| 337 | '13': 'Enter', |
| 338 | '16': 'Shift', |
| 339 | '17': 'Control', |
| 340 | '18': 'Alt', |
| 341 | '19': 'Pause', |
| 342 | '20': 'CapsLock', |
| 343 | '27': 'Escape', |
| 344 | '32': ' ', |
| 345 | '33': 'PageUp', |
| 346 | '34': 'PageDown', |
| 347 | '35': 'End', |
| 348 | '36': 'Home', |
| 349 | '37': 'ArrowLeft', |
| 350 | '38': 'ArrowUp', |
| 351 | '39': 'ArrowRight', |
| 352 | '40': 'ArrowDown', |
| 353 | '45': 'Insert', |
| 354 | '46': 'Delete', |
| 355 | '112': 'F1', |
| 356 | '113': 'F2', |
| 357 | '114': 'F3', |
| 358 | '115': 'F4', |
| 359 | '116': 'F5', |
| 360 | '117': 'F6', |
| 361 | '118': 'F7', |
| 362 | '119': 'F8', |
| 363 | '120': 'F9', |
| 364 | '121': 'F10', |
| 365 | '122': 'F11', |
| 366 | '123': 'F12', |
| 367 | '144': 'NumLock', |
| 368 | '145': 'ScrollLock', |
| 369 | '224': 'Meta', |
| 370 | }; |
| 371 | |
| 372 | /** |
| 373 | * @param {object} nativeEvent Native browser event. |
| 374 | * @return {string} Normalized `key` property. |
| 375 | */ |
| 376 | function getEventKey(nativeEvent: {[propName: string]: mixed}) { |
| 377 | if (nativeEvent.key) { |
| 378 | // Normalize inconsistent values reported by browsers due to |
| 379 | // implementations of a working draft specification. |
| 380 | |
| 381 | // FireFox implements `key` but returns `MozPrintableKey` for all |
| 382 | // printable characters (normalized to `Unidentified`), ignore it. |
| 383 | const key = |
| 384 | // $FlowFixMe[invalid-computed-prop] unable to index with a `mixed` value |
| 385 | normalizeKey[nativeEvent.key] || nativeEvent.key; |
| 386 | if (key !== 'Unidentified') { |
| 387 | return key; |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | // Browser does not implement `key`, polyfill as much of it as we can. |
| 392 | if (nativeEvent.type === 'keypress') { |
| 393 | const charCode = getEventCharCode( |
| 394 | // $FlowFixMe[incompatible-type] unable to narrow to `KeyboardEvent` |
| 395 | nativeEvent, |
| 396 | ); |
| 397 | |
| 398 | // The enter-key is technically both printable and non-printable and can |
| 399 | // thus be captured by `keypress`, no other non-printable key should. |
| 400 | return charCode === 13 ? 'Enter' : String.fromCharCode(charCode); |
| 401 | } |
| 402 | if (nativeEvent.type === 'keydown' || nativeEvent.type === 'keyup') { |
| 403 | // While user keyboard layout determines the actual meaning of each |
| 404 | // `keyCode` value, almost all function keys have a universal value. |
| 405 | // $FlowFixMe[invalid-computed-prop] unable to index with a `mixed` value |
| 406 | return translateToKey[nativeEvent.keyCode] || 'Unidentified'; |
| 407 | } |
| 408 | return ''; |
| 409 | } |
| 410 | |
| 411 | /** |
| 412 | * Translation from modifier key to the associated property in the event. |
| 413 | * @see http://www.w3.org/TR/DOM-Level-3-Events/#keys-Modifiers |
| 414 | */ |
| 415 | const modifierKeyToProp = { |
| 416 | Alt: 'altKey', |
| 417 | Control: 'ctrlKey', |
| 418 | Meta: 'metaKey', |
| 419 | Shift: 'shiftKey', |
| 420 | }; |
| 421 | |
| 422 | // Older browsers (Safari <= 10, iOS Safari <= 10.2) do not support |
| 423 | // getModifierState. If getModifierState is not supported, we map it to a set of |
| 424 | // modifier keys exposed by the event. In this case, Lock-keys are not supported. |
| 425 | // $FlowFixMe[missing-local-annot] |
| 426 | // $FlowFixMe[missing-this-annot] |
| 427 | function modifierStateGetter(keyArg) { |
| 428 | const syntheticEvent = this; |
| 429 | const nativeEvent = syntheticEvent.nativeEvent; |
| 430 | if (nativeEvent.getModifierState) { |
| 431 | return nativeEvent.getModifierState(keyArg); |
| 432 | } |
| 433 | const keyProp = modifierKeyToProp[keyArg]; |
| 434 | return keyProp ? !!nativeEvent[keyProp] : false; |
| 435 | } |
| 436 | |
| 437 | function getEventModifierState(nativeEvent: {[propName: string]: mixed}) { |
| 438 | return modifierStateGetter; |
| 439 | } |
| 440 | |
| 441 | /** |
| 442 | * @interface KeyboardEvent |
| 443 | * @see http://www.w3.org/TR/DOM-Level-3-Events/ |
| 444 | */ |
| 445 | const KeyboardEventInterface: EventInterfaceType = { |
| 446 | ...UIEventInterface, |
| 447 | key: getEventKey, |
| 448 | code: 0, |
| 449 | location: 0, |
| 450 | ctrlKey: 0, |
| 451 | shiftKey: 0, |
| 452 | altKey: 0, |
| 453 | metaKey: 0, |
| 454 | repeat: 0, |
| 455 | locale: 0, |
| 456 | getModifierState: getEventModifierState, |
| 457 | // Legacy Interface |
| 458 | charCode: function (event: {[propName: string]: mixed}) { |
| 459 | // `charCode` is the result of a KeyPress event and represents the value of |
| 460 | // the actual printable character. |
| 461 | |
| 462 | // KeyPress is deprecated, but its replacement is not yet final and not |
| 463 | // implemented in any major browser. Only KeyPress has charCode. |
| 464 | if (event.type === 'keypress') { |
| 465 | return getEventCharCode( |
| 466 | // $FlowFixMe[incompatible-type] unable to narrow to `KeyboardEvent` |
| 467 | event, |
| 468 | ); |
| 469 | } |
| 470 | return 0; |
| 471 | }, |
| 472 | keyCode: function (event: {[propName: string]: mixed}) { |
| 473 | // `keyCode` is the result of a KeyDown/Up event and represents the value of |
| 474 | // physical keyboard key. |
| 475 | |
| 476 | // The actual meaning of the value depends on the users' keyboard layout |
| 477 | // which cannot be detected. Assuming that it is a US keyboard layout |
| 478 | // provides a surprisingly accurate mapping for US and European users. |
| 479 | // Due to this, it is left to the user to implement at this time. |
| 480 | if (event.type === 'keydown' || event.type === 'keyup') { |
| 481 | return event.keyCode; |
| 482 | } |
| 483 | return 0; |
| 484 | }, |
| 485 | which: function (event: {[propName: string]: mixed}) { |
| 486 | // `which` is an alias for either `keyCode` or `charCode` depending on the |
| 487 | // type of the event. |
| 488 | if (event.type === 'keypress') { |
| 489 | return getEventCharCode( |
| 490 | // $FlowFixMe[incompatible-type] unable to narrow to `KeyboardEvent` |
| 491 | event, |
| 492 | ); |
| 493 | } |
| 494 | if (event.type === 'keydown' || event.type === 'keyup') { |
| 495 | return event.keyCode; |
| 496 | } |
| 497 | return 0; |
| 498 | }, |
| 499 | }; |
| 500 | export const SyntheticKeyboardEvent: $FlowFixMe = createSyntheticEvent( |
| 501 | KeyboardEventInterface, |
| 502 | ); |
| 503 | |
| 504 | /** |
| 505 | * @interface PointerEvent |
| 506 | * @see http://www.w3.org/TR/pointerevents/ |
| 507 | */ |
| 508 | const PointerEventInterface: EventInterfaceType = { |
| 509 | ...MouseEventInterface, |
| 510 | pointerId: 0, |
| 511 | width: 0, |
| 512 | height: 0, |
| 513 | pressure: 0, |
| 514 | tangentialPressure: 0, |
| 515 | tiltX: 0, |
| 516 | tiltY: 0, |
| 517 | twist: 0, |
| 518 | pointerType: 0, |
| 519 | isPrimary: 0, |
| 520 | }; |
| 521 | export const SyntheticPointerEvent: $FlowFixMe = createSyntheticEvent( |
| 522 | PointerEventInterface, |
| 523 | ); |
| 524 | |
| 525 | /** |
| 526 | * @interface SubmitEvent |
| 527 | * @see https://html.spec.whatwg.org/multipage/form-control-infrastructure.html#the-submitevent-interface |
| 528 | */ |
| 529 | const SubmitEventInterface: EventInterfaceType = { |
| 530 | ...EventInterface, |
| 531 | submitter: 0, |
| 532 | }; |
| 533 | export const SyntheticSubmitEvent: $FlowFixMe = |
| 534 | createSyntheticEvent(SubmitEventInterface); |
| 535 | |
| 536 | /** |
| 537 | * @interface TouchEvent |
| 538 | * @see http://www.w3.org/TR/touch-events/ |
| 539 | */ |
| 540 | const TouchEventInterface: EventInterfaceType = { |
| 541 | ...UIEventInterface, |
| 542 | touches: 0, |
| 543 | targetTouches: 0, |
| 544 | changedTouches: 0, |
| 545 | altKey: 0, |
| 546 | metaKey: 0, |
| 547 | ctrlKey: 0, |
| 548 | shiftKey: 0, |
| 549 | getModifierState: getEventModifierState, |
| 550 | }; |
| 551 | export const SyntheticTouchEvent: $FlowFixMe = |
| 552 | createSyntheticEvent(TouchEventInterface); |
| 553 | |
| 554 | /** |
| 555 | * @interface Event |
| 556 | * @see http://www.w3.org/TR/2009/WD-css3-transitions-20090320/#transition-events- |
| 557 | * @see https://developer.mozilla.org/en-US/docs/Web/API/TransitionEvent |
| 558 | */ |
| 559 | const TransitionEventInterface: EventInterfaceType = { |
| 560 | ...EventInterface, |
| 561 | propertyName: 0, |
| 562 | elapsedTime: 0, |
| 563 | pseudoElement: 0, |
| 564 | }; |
| 565 | export const SyntheticTransitionEvent: $FlowFixMe = createSyntheticEvent( |
| 566 | TransitionEventInterface, |
| 567 | ); |
| 568 | |
| 569 | /** |
| 570 | * @interface WheelEvent |
| 571 | * @see http://www.w3.org/TR/DOM-Level-3-Events/ |
| 572 | */ |
| 573 | const WheelEventInterface: EventInterfaceType = { |
| 574 | ...MouseEventInterface, |
| 575 | deltaX(event: {[propName: string]: mixed}) { |
| 576 | return 'deltaX' in event |
| 577 | ? event.deltaX |
| 578 | : // Fallback to `wheelDeltaX` for Webkit and normalize (right is positive). |
| 579 | 'wheelDeltaX' in event |
| 580 | ? // $FlowFixMe[unsafe-arithmetic] assuming this is a number |
| 581 | -event.wheelDeltaX |
| 582 | : 0; |
| 583 | }, |
| 584 | deltaY(event: {[propName: string]: mixed}) { |
| 585 | return 'deltaY' in event |
| 586 | ? event.deltaY |
| 587 | : // Fallback to `wheelDeltaY` for Webkit and normalize (down is positive). |
| 588 | 'wheelDeltaY' in event |
| 589 | ? // $FlowFixMe[unsafe-arithmetic] assuming this is a number |
| 590 | -event.wheelDeltaY |
| 591 | : // Fallback to `wheelDelta` for IE<9 and normalize (down is positive). |
| 592 | 'wheelDelta' in event |
| 593 | ? // $FlowFixMe[unsafe-arithmetic] assuming this is a number |
| 594 | -event.wheelDelta |
| 595 | : 0; |
| 596 | }, |
| 597 | deltaZ: 0, |
| 598 | |
| 599 | // Browsers without "deltaMode" is reporting in raw wheel delta where one |
| 600 | // notch on the scroll is always +/- 120, roughly equivalent to pixels. |
| 601 | // A good approximation of DOM_DELTA_LINE (1) is 5% of viewport size or |
| 602 | // ~40 pixels, for DOM_DELTA_SCREEN (2) it is 87.5% of viewport size. |
| 603 | deltaMode: 0, |
| 604 | }; |
| 605 | export const SyntheticWheelEvent: $FlowFixMe = |
| 606 | createSyntheticEvent(WheelEventInterface); |
| 607 | |
| 608 | const ToggleEventInterface: EventInterfaceType = { |
| 609 | ...EventInterface, |
| 610 | newState: 0, |
| 611 | oldState: 0, |
| 612 | source: 0, |
| 613 | }; |
| 614 | export const SyntheticToggleEvent: $FlowFixMe = |
| 615 | createSyntheticEvent(ToggleEventInterface); |