[TIMOB-1451] iOS: iPad, issue with dragging objects after initial release

This is device only, not being seen using the simulator. Using the provided code, fire up the app on an ipad and:

Using 1.4.1.7c619b and an ipad running 3.2.

1.launch app on device (start in landscape or portrait), file attached, but code copy pasted below
2.use your finger to drag the grey square to a new location
3.use your finger to press on the object then quickly make a circle. repeat if need be

results: on the second (or third) try, the object will not track with the users finger. This does not seem to occur on the first interaction.

// this sets the background color of the master UIView (when there are no windows/tab groups on it) Titanium.UI.setBackgroundColor('#000');

// create tab group var tabGroup = Titanium.UI.createTabGroup();

// // create base UI tab and root window // var win1 = Titanium.UI.createWindow({

title:'Tab 1',
backgroundColor:'#fff'

}); var tab1 = Titanium.UI.createTab({

icon:'KS_nav_views.png',
title:'Tab 1',
window:win1

});

var label1 = Titanium.UI.createLabel({

color:'#999',
text:'I am Window 1',
font:{fontSize:20,fontFamily:'Helvetica Neue'},
textAlign:'center',
width:'auto'

});

win1.add(label1);

// // create controls tab and root window // var win2 = Titanium.UI.createWindow({

title:'Tab 2',
backgroundColor:'#fff'

}); var tab2 = Titanium.UI.createTab({

icon:'KS_nav_ui.png',
title:'Tab 2',
window:win2

});

var label2 = Titanium.UI.createLabel({

color:'#999',
text:'I am Window 2',
font:{fontSize:20,fontFamily:'Helvetica Neue'},
textAlign:'center',
width:'auto'

});

win2.add(label2);

// // add tabs // tabGroup.addTab(tab1);
tabGroup.addTab(tab2);

// open tab group tabGroup.open();

/////////////////////////// NATES CODE ////////////////////

var logTable = Ti.UI.createTableView({ borderRadius: 10, data: [], top: 10, width: 250, rowHeight: 30, right: 10});
logTable.height = 300;

var logToTable = function(txt){

var row = Titanium.UI.createTableViewRow({});
var view = Titanium.UI.createView({height: 20, width: 'auto', left: 0});
var label = Titanium.UI.createLabel({
    text: txt, height:20, width: 'auto', left: 10,
    font: {fontSize: 10, fontFamily: 'Verdana'}
});
view.add(label);
row.add(view);

if( logTable.data.length > 0){
    logTable.insertRowBefore(0, row);
}else{
    logTable.appendRow(row);
}

};

var obj = Ti.UI.createView({

top: 20,
left: 20,
height: 200,
width: 200,
zIndex: 2,
backgroundColor: '#ccc',
center: {x: 200, y: 200}

});

win1.add(obj);
win1.add(logTable);

var animationOffset = {};
obj.addEventListener('touchstart', function(e){

animationOffset.log = [];
animationOffset.screenHeight = win1.toImage().height;
animationOffset.screenWidth = win1.toImage().width;
animationOffset.startingPositionX = obj.center.x;
animationOffset.startingPositionY = obj.center.y;

animationOffset.x = e.x - obj.width/2;
animationOffset.y = e.y -  obj.width/2;

animationOffset.lastX = e.x + obj.animatedCenter.x - obj.width/2;
animationOffset.lastY = e.y + obj.animatedCenter.y - obj.height/2;
animationOffset.lastX = animationOffset.lastX - animationOffset.x;
animationOffset.lastY = animationOffset.lastY - animationOffset.y;

animationOffset.log.push('------');
animationOffset.log.push('Start At: ' + obj.center.x + ', ' + obj.center.y);

});

obj.addEventListener('touchmove', function(e){

animationOffset.log.push(obj.animatedCenter.x + ", " + obj.animatedCenter.y);
var newX = e.x + obj.animatedCenter.x - obj.width/2;
var newY = e.y + obj.animatedCenter.y - obj.height/2;
newX = newX - animationOffset.x;
newY = newY - animationOffset.y;

var diffX = animationOffset.lastX - newX;
var diffY = animationOffset.lastY - newY;
if( diffX < 0 ){ diffX = diffX * -1; }
if( diffY < 0 ){ diffY = diffY * -1; }

if( (newX > animationOffset.screenWidth || newX < 0) || (newY > animationOffset.screenHeight || newY < 0) ){
    obj.fireEvent('touchcancel');
    return;
}

animationOffset.lastX = newX;
animationOffset.lastY = newY;
obj.animate({center:{x:newX,y:newY}, duration:0});

});

obj.addEventListener('touchcancel', function(){

obj.animate({center:{x: animationOffset.startingPositionX, y: animationOffset.startingPositionY}, duration:3});

});

obj.addEventListener('touchend', function(e){

Ti.API.notice('touchend');
for(var i=0; i<animationOffset.log.length; i++){
    logToTable(animationOffset.log[i]);
}

});