From de98e0b232509d5f40c135d540a70e415272ff85 Mon Sep 17 00:00:00 2001 From: Florian Dold Date: Wed, 3 May 2017 15:35:00 +0200 Subject: node_modules --- node_modules/react-dom/lib/ReactDOMSelection.js | 211 ++++++++++++++++++++++++ 1 file changed, 211 insertions(+) create mode 100644 node_modules/react-dom/lib/ReactDOMSelection.js (limited to 'node_modules/react-dom/lib/ReactDOMSelection.js') diff --git a/node_modules/react-dom/lib/ReactDOMSelection.js b/node_modules/react-dom/lib/ReactDOMSelection.js new file mode 100644 index 000000000..c2404ef09 --- /dev/null +++ b/node_modules/react-dom/lib/ReactDOMSelection.js @@ -0,0 +1,211 @@ +/** + * 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 ExecutionEnvironment = require('fbjs/lib/ExecutionEnvironment'); + +var getNodeForCharacterOffset = require('./getNodeForCharacterOffset'); +var getTextContentAccessor = require('./getTextContentAccessor'); + +/** + * While `isCollapsed` is available on the Selection object and `collapsed` + * is available on the Range object, IE11 sometimes gets them wrong. + * If the anchor/focus nodes and offsets are the same, the range is collapsed. + */ +function isCollapsed(anchorNode, anchorOffset, focusNode, focusOffset) { + return anchorNode === focusNode && anchorOffset === focusOffset; +} + +/** + * Get the appropriate anchor and focus node/offset pairs for IE. + * + * The catch here is that IE's selection API doesn't provide information + * about whether the selection is forward or backward, so we have to + * behave as though it's always forward. + * + * IE text differs from modern selection in that it behaves as though + * block elements end with a new line. This means character offsets will + * differ between the two APIs. + * + * @param {DOMElement} node + * @return {object} + */ +function getIEOffsets(node) { + var selection = document.selection; + var selectedRange = selection.createRange(); + var selectedLength = selectedRange.text.length; + + // Duplicate selection so we can move range without breaking user selection. + var fromStart = selectedRange.duplicate(); + fromStart.moveToElementText(node); + fromStart.setEndPoint('EndToStart', selectedRange); + + var startOffset = fromStart.text.length; + var endOffset = startOffset + selectedLength; + + return { + start: startOffset, + end: endOffset + }; +} + +/** + * @param {DOMElement} node + * @return {?object} + */ +function getModernOffsets(node) { + var selection = window.getSelection && window.getSelection(); + + if (!selection || selection.rangeCount === 0) { + return null; + } + + var anchorNode = selection.anchorNode; + var anchorOffset = selection.anchorOffset; + var focusNode = selection.focusNode; + var focusOffset = selection.focusOffset; + + var currentRange = selection.getRangeAt(0); + + // In Firefox, range.startContainer and range.endContainer can be "anonymous + // divs", e.g. the up/down buttons on an . Anonymous + // divs do not seem to expose properties, triggering a "Permission denied + // error" if any of its properties are accessed. The only seemingly possible + // way to avoid erroring is to access a property that typically works for + // non-anonymous divs and catch any error that may otherwise arise. See + // https://bugzilla.mozilla.org/show_bug.cgi?id=208427 + try { + /* eslint-disable no-unused-expressions */ + currentRange.startContainer.nodeType; + currentRange.endContainer.nodeType; + /* eslint-enable no-unused-expressions */ + } catch (e) { + return null; + } + + // If the node and offset values are the same, the selection is collapsed. + // `Selection.isCollapsed` is available natively, but IE sometimes gets + // this value wrong. + var isSelectionCollapsed = isCollapsed(selection.anchorNode, selection.anchorOffset, selection.focusNode, selection.focusOffset); + + var rangeLength = isSelectionCollapsed ? 0 : currentRange.toString().length; + + var tempRange = currentRange.cloneRange(); + tempRange.selectNodeContents(node); + tempRange.setEnd(currentRange.startContainer, currentRange.startOffset); + + var isTempRangeCollapsed = isCollapsed(tempRange.startContainer, tempRange.startOffset, tempRange.endContainer, tempRange.endOffset); + + var start = isTempRangeCollapsed ? 0 : tempRange.toString().length; + var end = start + rangeLength; + + // Detect whether the selection is backward. + var detectionRange = document.createRange(); + detectionRange.setStart(anchorNode, anchorOffset); + detectionRange.setEnd(focusNode, focusOffset); + var isBackward = detectionRange.collapsed; + + return { + start: isBackward ? end : start, + end: isBackward ? start : end + }; +} + +/** + * @param {DOMElement|DOMTextNode} node + * @param {object} offsets + */ +function setIEOffsets(node, offsets) { + var range = document.selection.createRange().duplicate(); + var start, end; + + if (offsets.end === undefined) { + start = offsets.start; + end = start; + } else if (offsets.start > offsets.end) { + start = offsets.end; + end = offsets.start; + } else { + start = offsets.start; + end = offsets.end; + } + + range.moveToElementText(node); + range.moveStart('character', start); + range.setEndPoint('EndToStart', range); + range.moveEnd('character', end - start); + range.select(); +} + +/** + * In modern non-IE browsers, we can support both forward and backward + * selections. + * + * Note: IE10+ supports the Selection object, but it does not support + * the `extend` method, which means that even in modern IE, it's not possible + * to programmatically create a backward selection. Thus, for all IE + * versions, we use the old IE API to create our selections. + * + * @param {DOMElement|DOMTextNode} node + * @param {object} offsets + */ +function setModernOffsets(node, offsets) { + if (!window.getSelection) { + return; + } + + var selection = window.getSelection(); + var length = node[getTextContentAccessor()].length; + var start = Math.min(offsets.start, length); + var end = offsets.end === undefined ? start : Math.min(offsets.end, length); + + // IE 11 uses modern selection, but doesn't support the extend method. + // Flip backward selections, so we can set with a single range. + if (!selection.extend && start > end) { + var temp = end; + end = start; + start = temp; + } + + var startMarker = getNodeForCharacterOffset(node, start); + var endMarker = getNodeForCharacterOffset(node, end); + + if (startMarker && endMarker) { + var range = document.createRange(); + range.setStart(startMarker.node, startMarker.offset); + selection.removeAllRanges(); + + if (start > end) { + selection.addRange(range); + selection.extend(endMarker.node, endMarker.offset); + } else { + range.setEnd(endMarker.node, endMarker.offset); + selection.addRange(range); + } + } +} + +var useIEOffsets = ExecutionEnvironment.canUseDOM && 'selection' in document && !('getSelection' in window); + +var ReactDOMSelection = { + /** + * @param {DOMElement} node + */ + getOffsets: useIEOffsets ? getIEOffsets : getModernOffsets, + + /** + * @param {DOMElement|DOMTextNode} node + * @param {object} offsets + */ + setOffsets: useIEOffsets ? setIEOffsets : setModernOffsets +}; + +module.exports = ReactDOMSelection; \ No newline at end of file -- cgit v1.2.3