reactjs源码

'use strict';

var EventConstants = _dereq_(15);
var EventPropagators = _dereq_(19);
var ExecutionEnvironment = _dereq_(130);
var FallbackCompositionState = _dereq_(20);
var SyntheticCompositionEvent = _dereq_(90);
var SyntheticInputEvent = _dereq_(94);

var keyOf = _dereq_(148);

var END_KEYCODES = [9, 13, 27, 32]; // Tab, Return, Esc, Space 很出彩啊
var START_KEYCODE = 229;

var canUseCompositionEvent = ExecutionEnvironment.canUseDOM && 'CompositionEvent' in window;

var documentMode = null;
if (ExecutionEnvironment.canUseDOM && 'documentMode' in document) {
documentMode = document.documentMode;
}

// Webkit offers a very useful `textInput` event that can be used to
// directly represent `beforeInput`. The IE `textinput` event is not as
// useful, so we don't use it.
var canUseTextInputEvent = ExecutionEnvironment.canUseDOM && 'TextEvent' in window && !documentMode && !isPresto();

// In IE9+, we have access to composition events, but the data supplied
// by the native compositionend event may be incorrect. Japanese ideographic
// spaces, for instance (\u3000) are not recorded correctly.
var useFallbackCompositionData = ExecutionEnvironment.canUseDOM && (!canUseCompositionEvent || documentMode && documentMode > 8 && documentMode <= 11);

/**
* Opera <= 12 includes TextEvent in window, but does not fire
* text input events. Rely on keypress instead.
*/
function isPresto() {
var opera = window.opera;
return typeof opera === 'object' && typeof opera.version === 'function' && parseInt(opera.version(), 10) <= 12;
}

var SPACEBAR_CODE = 32;
var SPACEBAR_CHAR = String.fromCharCode(SPACEBAR_CODE);

var topLevelTypes = EventConstants.topLevelTypes;

// Events and their corresponding property names.
var eventTypes = {
beforeInput: {
phasedRegistrationNames: {
bubbled: keyOf({ onBeforeInput: null }),
captured: keyOf({ onBeforeInputCapture: null })
},
dependencies: [topLevelTypes.topCompositionEnd, topLevelTypes.topKeyPress, topLevelTypes.topTextInput, topLevelTypes.topPaste]
},
compositionEnd: {
phasedRegistrationNames: {
bubbled: keyOf({ onCompositionEnd: null }),
captured: keyOf({ onCompositionEndCapture: null })
},
dependencies: [topLevelTypes.topBlur, topLevelTypes.topCompositionEnd, topLevelTypes.topKeyDown, topLevelTypes.topKeyPress, topLevelTypes.topKeyUp, topLevelTypes.topMouseDown]
},
compositionStart: {
phasedRegistrationNames: {
bubbled: keyOf({ onCompositionStart: null }),
captured: keyOf({ onCompositionStartCapture: null })
},
dependencies: [topLevelTypes.topBlur, topLevelTypes.topCompositionStart, topLevelTypes.topKeyDown, topLevelTypes.topKeyPress, topLevelTypes.topKeyUp, topLevelTypes.topMouseDown]
},
compositionUpdate: {
phasedRegistrationNames: {
bubbled: keyOf({ onCompositionUpdate: null }),
captured: keyOf({ onCompositionUpdateCapture: null })
},
dependencies: [topLevelTypes.topBlur, topLevelTypes.topCompositionUpdate, topLevelTypes.topKeyDown, topLevelTypes.topKeyPress, topLevelTypes.topKeyUp, topLevelTypes.topMouseDown]
}
};