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Diffstat (limited to 'node_modules/react-dom/lib/SelectEventPlugin.js')
| -rw-r--r-- | node_modules/react-dom/lib/SelectEventPlugin.js | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/SelectEventPlugin.js b/node_modules/react-dom/lib/SelectEventPlugin.js new file mode 100644 index 000000000..0d0af2110 --- /dev/null +++ b/node_modules/react-dom/lib/SelectEventPlugin.js @@ -0,0 +1,190 @@ +/** + * Copyright 2013-present, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under the BSD-style license found in the + * LICENSE file in the root directory of this source tree. An additional grant + * of patent rights can be found in the PATENTS file in the same directory. + * + */ + +'use strict'; + +var EventPropagators = require('./EventPropagators'); +var ExecutionEnvironment = require('fbjs/lib/ExecutionEnvironment'); +var ReactDOMComponentTree = require('./ReactDOMComponentTree'); +var ReactInputSelection = require('./ReactInputSelection'); +var SyntheticEvent = require('./SyntheticEvent'); + +var getActiveElement = require('fbjs/lib/getActiveElement'); +var isTextInputElement = require('./isTextInputElement'); +var shallowEqual = require('fbjs/lib/shallowEqual'); + +var skipSelectionChangeEvent = ExecutionEnvironment.canUseDOM && 'documentMode' in document && document.documentMode <= 11; + +var eventTypes = { + select: { + phasedRegistrationNames: { + bubbled: 'onSelect', + captured: 'onSelectCapture' + }, + dependencies: ['topBlur', 'topContextMenu', 'topFocus', 'topKeyDown', 'topKeyUp', 'topMouseDown', 'topMouseUp', 'topSelectionChange'] + } +}; + +var activeElement = null; +var activeElementInst = null; +var lastSelection = null; +var mouseDown = false; + +// Track whether a listener exists for this plugin. If none exist, we do +// not extract events. See #3639. +var hasListener = false; + +/** + * Get an object which is a unique representation of the current selection. + * + * The return value will not be consistent across nodes or browsers, but + * two identical selections on the same node will return identical objects. + * + * @param {DOMElement} node + * @return {object} + */ +function getSelection(node) { + if ('selectionStart' in node && ReactInputSelection.hasSelectionCapabilities(node)) { + return { + start: node.selectionStart, + end: node.selectionEnd + }; + } else if (window.getSelection) { + var selection = window.getSelection(); + return { + anchorNode: selection.anchorNode, + anchorOffset: selection.anchorOffset, + focusNode: selection.focusNode, + focusOffset: selection.focusOffset + }; + } else if (document.selection) { + var range = document.selection.createRange(); + return { + parentElement: range.parentElement(), + text: range.text, + top: range.boundingTop, + left: range.boundingLeft + }; + } +} + +/** + * Poll selection to see whether it's changed. + * + * @param {object} nativeEvent + * @return {?SyntheticEvent} + */ +function constructSelectEvent(nativeEvent, nativeEventTarget) { + // Ensure we have the right element, and that the user is not dragging a + // selection (this matches native `select` event behavior). In HTML5, select + // fires only on input and textarea thus if there's no focused element we + // won't dispatch. + if (mouseDown || activeElement == null || activeElement !== getActiveElement()) { + return null; + } + + // Only fire when selection has actually changed. + var currentSelection = getSelection(activeElement); + if (!lastSelection || !shallowEqual(lastSelection, currentSelection)) { + lastSelection = currentSelection; + + var syntheticEvent = SyntheticEvent.getPooled(eventTypes.select, activeElementInst, nativeEvent, nativeEventTarget); + + syntheticEvent.type = 'select'; + syntheticEvent.target = activeElement; + + EventPropagators.accumulateTwoPhaseDispatches(syntheticEvent); + + return syntheticEvent; + } + + return null; +} + +/** + * This plugin creates an `onSelect` event that normalizes select events + * across form elements. + * + * Supported elements are: + * - input (see `isTextInputElement`) + * - textarea + * - contentEditable + * + * This differs from native browser implementations in the following ways: + * - Fires on contentEditable fields as well as inputs. + * - Fires for collapsed selection. + * - Fires after user input. + */ +var SelectEventPlugin = { + + eventTypes: eventTypes, + + extractEvents: function (topLevelType, targetInst, nativeEvent, nativeEventTarget) { + if (!hasListener) { + return null; + } + + var targetNode = targetInst ? ReactDOMComponentTree.getNodeFromInstance(targetInst) : window; + + switch (topLevelType) { + // Track the input node that has focus. + case 'topFocus': + if (isTextInputElement(targetNode) || targetNode.contentEditable === 'true') { + activeElement = targetNode; + activeElementInst = targetInst; + lastSelection = null; + } + break; + case 'topBlur': + activeElement = null; + activeElementInst = null; + lastSelection = null; + break; + + // Don't fire the event while the user is dragging. This matches the + // semantics of the native select event. + case 'topMouseDown': + mouseDown = true; + break; + case 'topContextMenu': + case 'topMouseUp': + mouseDown = false; + return constructSelectEvent(nativeEvent, nativeEventTarget); + + // Chrome and IE fire non-standard event when selection is changed (and + // sometimes when it hasn't). IE's event fires out of order with respect + // to key and input events on deletion, so we discard it. + // + // Firefox doesn't support selectionchange, so check selection status + // after each key entry. The selection changes after keydown and before + // keyup, but we check on keydown as well in the case of holding down a + // key, when multiple keydown events are fired but only one keyup is. + // This is also our approach for IE handling, for the reason above. + case 'topSelectionChange': + if (skipSelectionChangeEvent) { + break; + } + // falls through + case 'topKeyDown': + case 'topKeyUp': + return constructSelectEvent(nativeEvent, nativeEventTarget); + } + + return null; + }, + + didPutListener: function (inst, registrationName, listener) { + if (registrationName === 'onSelect') { + hasListener = true; + } + } +}; + +module.exports = SelectEventPlugin;
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