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Adding pinch event #82

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1 change: 1 addition & 0 deletions build/lib.js
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,7 @@ steal("jquery",
"jquerypp/event/pause",
"jquerypp/event/resize",
"jquerypp/event/swipe",
"jquerypp/event/pinch",
function($) {
return $;
});
49 changes: 49 additions & 0 deletions event/pinch/pinch.html
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@@ -0,0 +1,49 @@
<!DOCTYPE HTML>
<html>
<head>
<title>pinch</title>
<style type='text/css'>
body {font-family: verdana}
.error {border: solid 1px red;}
.error_text { color: red; font-size: 10px;}
td {padding: 3px;}
#pinch {
width: 500px;
height: 100px;
background-color: green;
}
li {
border: solid 5px green;
width: 200px;
height: 200px;
margin-left: 400px;
}
</style>
</head>
<body>
<div id='pinch'>Pinch Me</div>
<div id='pinches'>Pinches
<ul>
<li>Pinch Me</li>
<li>Pinch Me</li>
<li>Pinch Me</li>
<li>Pinch Me</li>
</ul>
</div>
<script type='text/javascript' src='../../../steal/steal.js'></script>
<script>
steal('jquery', 'jquerypp/event/pinch', function($) {
$('#pinch').bind('pinch', function(){
console.log('pinch1')
}).bind("pinchin", function(){
console.log('in')
}).bind('pinchout', function(){
console.log('out')
})
$('#pinches').delegate('li','pinch', function(){
console.log('pinch2')
})
})
</script>
</body>
</html>
64 changes: 64 additions & 0 deletions event/pinch/pinch.js
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steal('jquery', 'jquerypp/event/livehack', function($) {

var isPhantom = /Phantom/.test(navigator.userAgent),
supportGestures = !isPhantom && "ongestureend" in document;

if(!supportGestures) {
return $;
}

/**
* @add jQuery.event.pinch
*/
var pinch = $.event.pinch = {
/**
* @attribute minScale
* minScale is the minimum amount of scale change required to trigger a pinch event. This defaults to 0.01.
*
* The scale of the gestureend event must differ by at least this much.
*/
minScale : 0.01,
};

$.event.setupHelper( [
/**
* @hide
* @attribute pinch
*/
"pinch",
/**
* @hide
* @attribute pinchin
*/
'pinchin',
/**
* @hide
* @attribute pinchout
*/
'pinchout'], "gesturestart", function(ev) {
var delegate = ev.delegateTarget || ev.currentTarget,
selector = ev.handleObj.selector,
entered = this;

$(document.documentElement).one('gestureend', function(event) {
var scale = event.originalEvent.scale,
deltaScale = Math.abs(1 - scale),
events = [];

if(deltaScale >= pinch.minScale) {
events.push('pinch');
if(scale > 1) {
events.push('pinchout')
} else if(scale < 1) {
events.push('pinchin')
}

$.each($.event.find(delegate, events, selector), function(){
this.call(entered, ev);
});
}
})
});

return $;
});
19 changes: 19 additions & 0 deletions event/pinch/pinch.md
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@page jQuery.event.pinch
@parent jquerypp

`jQuery.event.pinch` provides `pinchout`, `pinchin` and a general `pinch` event in browsers that support multi-touch gesture events.
Detecting pinches is done via gesture events.

A pinch happens when two fingers move away or towards each other and change the scale of the document by more than [jQuery.event.pinch.minScale]. The pinch events are fired when the gesture ends, so pinching in and then out will result in a single `pinchout` event.

$('#swiper').on({
'pinch' : function(ev) {
console.log('Pinched')
},
'pinchin' : function(ev) {
console.log('Pinched In')
},
'pinchout' : function(ev) {
console.log('Pinched Out')
}
})