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Merge pull request #18871 from justindarc/bug1000984-v1.4
Bug 1000984 - [Camera] Pinch-to-zoom gesture should be attached to the |...
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| define(function(require, exports, module) { | ||
| 'use strict'; | ||
|
|
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| /** | ||
| * Dependencies | ||
| */ | ||
|
|
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| var bind = require('lib/bind'); | ||
| var unbind = require('lib/bind').unbind; | ||
| var bindAll = require('lib/bind-all'); | ||
| var events = require('vendor/evt'); | ||
|
|
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| /** | ||
| * Mixin event emitter | ||
| */ | ||
|
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| events(Pinch.prototype); | ||
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| /** | ||
| * Exports | ||
| */ | ||
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| module.exports = Pinch; | ||
|
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| /** | ||
| * Initialize a new `Pinch` interface. | ||
| * | ||
| * @constructor | ||
| */ | ||
| function Pinch(el) { | ||
| bindAll(this); | ||
| this.attach(el); | ||
| } | ||
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| Pinch.prototype.attach = function(el) { | ||
| this.el = el; | ||
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| bind(this.el, 'touchstart', this.onTouchStart); | ||
| bind(window, 'touchmove', this.onTouchMove); | ||
| bind(window, 'touchend', this.onTouchEnd); | ||
| }; | ||
|
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| Pinch.prototype.detach = function() { | ||
| unbind(this.el, 'touchstart', this.onTouchStart); | ||
| unbind(window, 'touchmove', this.onTouchMove); | ||
| unbind(window, 'touchend', this.onTouchEnd); | ||
|
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| this.el = null; | ||
| }; | ||
|
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| Pinch.prototype.onTouchStart = function(evt) { | ||
| if (evt.touches.length !== 2) { | ||
| return; | ||
| } | ||
|
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| this.lastTouchA = evt.touches[0]; | ||
| this.lastTouchB = evt.touches[1]; | ||
| this.isPinching = true; | ||
| this.emit('pinchstarted'); | ||
| }; | ||
|
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| Pinch.prototype.onTouchMove = function(evt) { | ||
| if (!this.isPinching) { | ||
| return; | ||
| } | ||
|
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| var touchA = getNewTouchA(this, evt.touches); | ||
| var touchB = getNewTouchB(this, evt.touches); | ||
| var deltaPinch = getDeltaPinch(this, touchA, touchB); | ||
|
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| this.emit('pinchchanged', deltaPinch); | ||
|
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| this.lastTouchA = touchA; | ||
| this.lastTouchB = touchB; | ||
| }; | ||
|
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| Pinch.prototype.onTouchEnd = function(evt) { | ||
| if (!this.isPinching) { | ||
| return; | ||
| } | ||
|
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| if (evt.touches.length < 2) { | ||
| this.isPinching = false; | ||
| this.emit('pinchended'); | ||
| } | ||
| }; | ||
|
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| function getNewTouchA(pinch, touches) { | ||
| if (!pinch.lastTouchA) { | ||
| return null; | ||
| } | ||
|
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| for (var i = 0, length = touches.length, touch; i < length; i++) { | ||
| touch = touches[i]; | ||
| if (touch.identifier === pinch.lastTouchA.identifier) { | ||
| return touch; | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
|
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| function getNewTouchB(pinch, touches) { | ||
| if (!pinch.lastTouchB) { | ||
| return null; | ||
| } | ||
|
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| for (var i = 0, length = touches.length, touch; i < length; i++) { | ||
| touch = touches[i]; | ||
| if (touch.identifier === pinch.lastTouchB.identifier) { | ||
| return touch; | ||
| } | ||
| } | ||
| return null; | ||
| } | ||
|
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| function getDeltaPinch(pinch, touchA, touchB) { | ||
| var lastTouchA = pinch.lastTouchA; | ||
| var lastTouchB = pinch.lastTouchB; | ||
| if (!touchA || !lastTouchA || !touchB || !lastTouchB) { | ||
| return 0; | ||
| } | ||
|
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| var oldDistance = Math.sqrt( | ||
| Math.pow(lastTouchB.pageX - lastTouchA.pageX, 2) + | ||
| Math.pow(lastTouchB.pageY - lastTouchA.pageY, 2)); | ||
| var newDistance = Math.sqrt( | ||
| Math.pow(touchB.pageX - touchA.pageX, 2) + | ||
| Math.pow(touchB.pageY - touchA.pageY, 2)); | ||
| return newDistance - oldDistance; | ||
| } | ||
|
|
||
| }); |
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