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author | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
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committer | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
commit | de98e0b232509d5f40c135d540a70e415272ff85 (patch) | |
tree | a79222a5b58484ab3b80d18efcaaa7ccc4769b33 /node_modules/react-dom/lib/ResponderTouchHistoryStore.js | |
parent | e0c9d480a73fa629c1e4a47d3e721f1d2d345406 (diff) | |
download | wallet-core-de98e0b232509d5f40c135d540a70e415272ff85.tar.xz |
node_modules
Diffstat (limited to 'node_modules/react-dom/lib/ResponderTouchHistoryStore.js')
-rw-r--r-- | node_modules/react-dom/lib/ResponderTouchHistoryStore.js | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/ResponderTouchHistoryStore.js b/node_modules/react-dom/lib/ResponderTouchHistoryStore.js new file mode 100644 index 000000000..3813bdace --- /dev/null +++ b/node_modules/react-dom/lib/ResponderTouchHistoryStore.js @@ -0,0 +1,183 @@ +/** + * 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 _prodInvariant = require('./reactProdInvariant'); + +var EventPluginUtils = require('./EventPluginUtils'); + +var invariant = require('fbjs/lib/invariant'); +var warning = require('fbjs/lib/warning'); + +var isEndish = EventPluginUtils.isEndish, + isMoveish = EventPluginUtils.isMoveish, + isStartish = EventPluginUtils.isStartish; + +/** + * Tracks the position and time of each active touch by `touch.identifier`. We + * should typically only see IDs in the range of 1-20 because IDs get recycled + * when touches end and start again. + */ + +var MAX_TOUCH_BANK = 20; +var touchBank = []; +var touchHistory = { + touchBank: touchBank, + numberActiveTouches: 0, + // If there is only one active touch, we remember its location. This prevents + // us having to loop through all of the touches all the time in the most + // common case. + indexOfSingleActiveTouch: -1, + mostRecentTimeStamp: 0 +}; + +function timestampForTouch(touch) { + // The legacy internal implementation provides "timeStamp", which has been + // renamed to "timestamp". Let both work for now while we iron it out + // TODO (evv): rename timeStamp to timestamp in internal code + return touch.timeStamp || touch.timestamp; +} + +/** + * TODO: Instead of making gestures recompute filtered velocity, we could + * include a built in velocity computation that can be reused globally. + */ +function createTouchRecord(touch) { + return { + touchActive: true, + startPageX: touch.pageX, + startPageY: touch.pageY, + startTimeStamp: timestampForTouch(touch), + currentPageX: touch.pageX, + currentPageY: touch.pageY, + currentTimeStamp: timestampForTouch(touch), + previousPageX: touch.pageX, + previousPageY: touch.pageY, + previousTimeStamp: timestampForTouch(touch) + }; +} + +function resetTouchRecord(touchRecord, touch) { + touchRecord.touchActive = true; + touchRecord.startPageX = touch.pageX; + touchRecord.startPageY = touch.pageY; + touchRecord.startTimeStamp = timestampForTouch(touch); + touchRecord.currentPageX = touch.pageX; + touchRecord.currentPageY = touch.pageY; + touchRecord.currentTimeStamp = timestampForTouch(touch); + touchRecord.previousPageX = touch.pageX; + touchRecord.previousPageY = touch.pageY; + touchRecord.previousTimeStamp = timestampForTouch(touch); +} + +function getTouchIdentifier(_ref) { + var identifier = _ref.identifier; + + !(identifier != null) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'Touch object is missing identifier.') : _prodInvariant('138') : void 0; + process.env.NODE_ENV !== 'production' ? warning(identifier <= MAX_TOUCH_BANK, 'Touch identifier %s is greater than maximum supported %s which causes ' + 'performance issues backfilling array locations for all of the indices.', identifier, MAX_TOUCH_BANK) : void 0; + return identifier; +} + +function recordTouchStart(touch) { + var identifier = getTouchIdentifier(touch); + var touchRecord = touchBank[identifier]; + if (touchRecord) { + resetTouchRecord(touchRecord, touch); + } else { + touchBank[identifier] = createTouchRecord(touch); + } + touchHistory.mostRecentTimeStamp = timestampForTouch(touch); +} + +function recordTouchMove(touch) { + var touchRecord = touchBank[getTouchIdentifier(touch)]; + if (touchRecord) { + touchRecord.touchActive = true; + touchRecord.previousPageX = touchRecord.currentPageX; + touchRecord.previousPageY = touchRecord.currentPageY; + touchRecord.previousTimeStamp = touchRecord.currentTimeStamp; + touchRecord.currentPageX = touch.pageX; + touchRecord.currentPageY = touch.pageY; + touchRecord.currentTimeStamp = timestampForTouch(touch); + touchHistory.mostRecentTimeStamp = timestampForTouch(touch); + } else { + console.error('Cannot record touch move without a touch start.\n' + 'Touch Move: %s\n', 'Touch Bank: %s', printTouch(touch), printTouchBank()); + } +} + +function recordTouchEnd(touch) { + var touchRecord = touchBank[getTouchIdentifier(touch)]; + if (touchRecord) { + touchRecord.touchActive = false; + touchRecord.previousPageX = touchRecord.currentPageX; + touchRecord.previousPageY = touchRecord.currentPageY; + touchRecord.previousTimeStamp = touchRecord.currentTimeStamp; + touchRecord.currentPageX = touch.pageX; + touchRecord.currentPageY = touch.pageY; + touchRecord.currentTimeStamp = timestampForTouch(touch); + touchHistory.mostRecentTimeStamp = timestampForTouch(touch); + } else { + console.error('Cannot record touch end without a touch start.\n' + 'Touch End: %s\n', 'Touch Bank: %s', printTouch(touch), printTouchBank()); + } +} + +function printTouch(touch) { + return JSON.stringify({ + identifier: touch.identifier, + pageX: touch.pageX, + pageY: touch.pageY, + timestamp: timestampForTouch(touch) + }); +} + +function printTouchBank() { + var printed = JSON.stringify(touchBank.slice(0, MAX_TOUCH_BANK)); + if (touchBank.length > MAX_TOUCH_BANK) { + printed += ' (original size: ' + touchBank.length + ')'; + } + return printed; +} + +var ResponderTouchHistoryStore = { + recordTouchTrack: function (topLevelType, nativeEvent) { + if (isMoveish(topLevelType)) { + nativeEvent.changedTouches.forEach(recordTouchMove); + } else if (isStartish(topLevelType)) { + nativeEvent.changedTouches.forEach(recordTouchStart); + touchHistory.numberActiveTouches = nativeEvent.touches.length; + if (touchHistory.numberActiveTouches === 1) { + touchHistory.indexOfSingleActiveTouch = nativeEvent.touches[0].identifier; + } + } else if (isEndish(topLevelType)) { + nativeEvent.changedTouches.forEach(recordTouchEnd); + touchHistory.numberActiveTouches = nativeEvent.touches.length; + if (touchHistory.numberActiveTouches === 1) { + for (var i = 0; i < touchBank.length; i++) { + var touchTrackToCheck = touchBank[i]; + if (touchTrackToCheck != null && touchTrackToCheck.touchActive) { + touchHistory.indexOfSingleActiveTouch = i; + break; + } + } + if (process.env.NODE_ENV !== 'production') { + var activeRecord = touchBank[touchHistory.indexOfSingleActiveTouch]; + process.env.NODE_ENV !== 'production' ? warning(activeRecord != null && activeRecord.touchActive, 'Cannot find single active touch.') : void 0; + } + } + } + }, + + + touchHistory: touchHistory +}; + +module.exports = ResponderTouchHistoryStore;
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