--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/io2012slides/js/hammer.js	Mon Mar 25 05:14:03 2013 +0900
@@ -0,0 +1,586 @@
+/*
+ * Hammer.JS
+ * version 0.4
+ * author: Eight Media
+ * https://github.com/EightMedia/hammer.js
+ */
+function Hammer(element, options, undefined)
+{
+    var self = this;
+
+    var defaults = {
+        // prevent the default event or not... might be buggy when false
+        prevent_default    : false,
+        css_hacks          : true,
+
+        drag               : true,
+        drag_vertical      : true,
+        drag_horizontal    : true,
+        // minimum distance before the drag event starts
+        drag_min_distance  : 20, // pixels
+
+        // pinch zoom and rotation
+        transform          : true,
+        scale_treshold     : 0.1,
+        rotation_treshold  : 15, // degrees
+
+        tap                : true,
+        tap_double         : true,
+        tap_max_interval   : 300,
+        tap_double_distance: 20,
+
+        hold               : true,
+        hold_timeout       : 500
+    };
+    options = mergeObject(defaults, options);
+
+    // some css hacks
+    (function() {
+        if(!options.css_hacks) {
+            return false;
+        }
+
+        var vendors = ['webkit','moz','ms','o',''];
+        var css_props = {
+            "userSelect": "none",
+            "touchCallout": "none",
+            "userDrag": "none",
+            "tapHighlightColor": "rgba(0,0,0,0)"
+        };
+
+        var prop = '';
+        for(var i = 0; i < vendors.length; i++) {
+            for(var p in css_props) {
+                prop = p;
+                if(vendors[i]) {
+                    prop = vendors[i] + prop.substring(0, 1).toUpperCase() + prop.substring(1);
+                }
+                element.style[ prop ] = css_props[p];
+            }
+        }
+    })();
+
+    // holds the distance that has been moved
+    var _distance = 0;
+
+    // holds the exact angle that has been moved
+    var _angle = 0;
+
+    // holds the diraction that has been moved
+    var _direction = 0;
+
+    // holds position movement for sliding
+    var _pos = { };
+
+    // how many fingers are on the screen
+    var _fingers = 0;
+
+    var _first = false;
+
+    var _gesture = null;
+    var _prev_gesture = null;
+
+    var _touch_start_time = null;
+    var _prev_tap_pos = {x: 0, y: 0};
+    var _prev_tap_end_time = null;
+
+    var _hold_timer = null;
+
+    var _offset = {};
+
+    // keep track of the mouse status
+    var _mousedown = false;
+
+    var _event_start;
+    var _event_move;
+    var _event_end;
+
+
+    /**
+     * angle to direction define
+     * @param  float    angle
+     * @return string   direction
+     */
+    this.getDirectionFromAngle = function( angle )
+    {
+        var directions = {
+            down: angle >= 45 && angle < 135, //90
+            left: angle >= 135 || angle <= -135, //180
+            up: angle < -45 && angle > -135, //270
+            right: angle >= -45 && angle <= 45 //0
+        };
+
+        var direction, key;
+        for(key in directions){
+            if(directions[key]){
+                direction = key;
+                break;
+            }
+        }
+        return direction;
+    };
+
+
+    /**
+     * count the number of fingers in the event
+     * when no fingers are detected, one finger is returned (mouse pointer)
+     * @param  event
+     * @return int  fingers
+     */
+    function countFingers( event )
+    {
+        // there is a bug on android (until v4?) that touches is always 1,
+        // so no multitouch is supported, e.g. no, zoom and rotation...
+        return event.touches ? event.touches.length : 1;
+    }
+
+
+    /**
+     * get the x and y positions from the event object
+     * @param  event
+     * @return array  [{ x: int, y: int }]
+     */
+    function getXYfromEvent( event )
+    {
+        event = event || window.event;
+
+        // no touches, use the event pageX and pageY
+        if(!event.touches) {
+            var doc = document,
+                body = doc.body;
+
+            return [{
+                x: event.pageX || event.clientX + ( doc && doc.scrollLeft || body && body.scrollLeft || 0 ) - ( doc && doc.clientLeft || body && doc.clientLeft || 0 ),
+                y: event.pageY || event.clientY + ( doc && doc.scrollTop || body && body.scrollTop || 0 ) - ( doc && doc.clientTop || body && doc.clientTop || 0 )
+            }];
+        }
+        // multitouch, return array with positions
+        else {
+            var pos = [], src;
+            for(var t=0, len=event.touches.length; t<len; t++) {
+                src = event.touches[t];
+                pos.push({ x: src.pageX, y: src.pageY });
+            }
+            return pos;
+        }
+    }
+
+
+    /**
+     * calculate the angle between two points
+     * @param object pos1 { x: int, y: int }
+     * @param object pos2 { x: int, y: int }
+     */
+    function getAngle( pos1, pos2 )
+    {
+        return Math.atan2(pos2.y - pos1.y, pos2.x - pos1.x) * 180 / Math.PI;
+    }
+
+    /**
+     * trigger an event/callback by name with params
+     * @param string name
+     * @param array  params
+     */
+    function triggerEvent( eventName, params )
+    {
+        // return touches object
+        params.touches = getXYfromEvent(params.originalEvent);
+        params.type = eventName;
+
+        // trigger callback
+        if(isFunction(self["on"+ eventName])) {
+            self["on"+ eventName].call(self, params);
+        }
+    }
+
+
+    /**
+     * cancel event
+     * @param   object  event
+     * @return  void
+     */
+
+    function cancelEvent(event){
+        event = event || window.event;
+        if(event.preventDefault){
+            event.preventDefault();
+        }else{
+            event.returnValue = false;
+            event.cancelBubble = true;
+        }
+    }
+
+
+    /**
+     * reset the internal vars to the start values
+     */
+    function reset()
+    {
+        _pos = {};
+        _first = false;
+        _fingers = 0;
+        _distance = 0;
+        _angle = 0;
+        _gesture = null;
+    }
+
+
+    var gestures = {
+        // hold gesture
+        // fired on touchstart
+        hold : function(event)
+        {
+            // only when one finger is on the screen
+            if(options.hold) {
+                _gesture = 'hold';
+                clearTimeout(_hold_timer);
+
+                _hold_timer = setTimeout(function() {
+                    if(_gesture == 'hold') {
+                        triggerEvent("hold", {
+                            originalEvent   : event,
+                            position        : _pos.start
+                        });
+                    }
+                }, options.hold_timeout);
+            }
+        },
+
+
+        // drag gesture
+        // fired on mousemove
+        drag : function(event)
+        {
+            // get the distance we moved
+            var _distance_x = _pos.move[0].x - _pos.start[0].x;
+            var _distance_y = _pos.move[0].y - _pos.start[0].y;
+            _distance = Math.sqrt(_distance_x * _distance_x + _distance_y * _distance_y);
+
+            // drag
+            // minimal movement required
+            if(options.drag && (_distance > options.drag_min_distance) || _gesture == 'drag') {
+                // calculate the angle
+                _angle = getAngle(_pos.start[0], _pos.move[0]);
+                _direction = self.getDirectionFromAngle(_angle);
+
+                // check the movement and stop if we go in the wrong direction
+                var is_vertical = (_direction == 'up' || _direction == 'down');
+                if(((is_vertical && !options.drag_vertical) || (!is_vertical && !options.drag_horizontal))
+                    && (_distance > options.drag_min_distance)) {
+                    return;
+                }
+
+                _gesture = 'drag';
+
+                var position = { x: _pos.move[0].x - _offset.left,
+                    y: _pos.move[0].y - _offset.top };
+
+                var event_obj = {
+                    originalEvent   : event,
+                    position        : position,
+                    direction       : _direction,
+                    distance        : _distance,
+                    distanceX       : _distance_x,
+                    distanceY       : _distance_y,
+                    angle           : _angle
+                };
+
+                // on the first time trigger the start event
+                if(_first) {
+                    triggerEvent("dragstart", event_obj);
+
+                    _first = false;
+                }
+
+                // normal slide event
+                triggerEvent("drag", event_obj);
+
+                cancelEvent(event);
+            }
+        },
+
+
+        // transform gesture
+        // fired on touchmove
+        transform : function(event)
+        {
+            if(options.transform) {
+                var scale = event.scale || 1;
+                var rotation = event.rotation || 0;
+
+                if(countFingers(event) != 2) {
+                    return false;
+                }
+
+                if(_gesture != 'drag' &&
+                    (_gesture == 'transform' || Math.abs(1-scale) > options.scale_treshold
+                        || Math.abs(rotation) > options.rotation_treshold)) {
+                    _gesture = 'transform';
+
+                    _pos.center = {  x: ((_pos.move[0].x + _pos.move[1].x) / 2) - _offset.left,
+                        y: ((_pos.move[0].y + _pos.move[1].y) / 2) - _offset.top };
+
+                    var event_obj = {
+                        originalEvent   : event,
+                        position        : _pos.center,
+                        scale           : scale,
+                        rotation        : rotation
+                    };
+
+                    // on the first time trigger the start event
+                    if(_first) {
+                        triggerEvent("transformstart", event_obj);
+                        _first = false;
+                    }
+
+                    triggerEvent("transform", event_obj);
+
+                    cancelEvent(event);
+
+                    return true;
+                }
+            }
+
+            return false;
+        },
+
+
+        // tap and double tap gesture
+        // fired on touchend
+        tap : function(event)
+        {
+            // compare the kind of gesture by time
+            var now = new Date().getTime();
+            var touch_time = now - _touch_start_time;
+
+            // dont fire when hold is fired
+            if(options.hold && !(options.hold && options.hold_timeout > touch_time)) {
+                return;
+            }
+
+            // when previous event was tap and the tap was max_interval ms ago
+            var is_double_tap = (function(){
+                if (_prev_tap_pos && options.tap_double && _prev_gesture == 'tap' && (_touch_start_time - _prev_tap_end_time) < options.tap_max_interval) {
+                    var x_distance = Math.abs(_prev_tap_pos[0].x - _pos.start[0].x);
+                    var y_distance = Math.abs(_prev_tap_pos[0].y - _pos.start[0].y);
+                    return (_prev_tap_pos && _pos.start && Math.max(x_distance, y_distance) < options.tap_double_distance);
+
+                }
+                return false;
+            })();
+
+            if(is_double_tap) {
+                _gesture = 'double_tap';
+                _prev_tap_end_time = null;
+
+                triggerEvent("doubletap", {
+                    originalEvent   : event,
+                    position        : _pos.start
+                });
+                cancelEvent(event);
+            }
+
+            // single tap is single touch
+            else {
+                _gesture = 'tap';
+                _prev_tap_end_time = now;
+                _prev_tap_pos = _pos.start;
+
+                if(options.tap) {
+                    triggerEvent("tap", {
+                        originalEvent   : event,
+                        position        : _pos.start
+                    });
+                    cancelEvent(event);
+                }
+            }
+
+        }
+
+    };
+
+
+    function handleEvents(event)
+    {
+        switch(event.type)
+        {
+            case 'mousedown':
+            case 'touchstart':
+                _pos.start = getXYfromEvent(event);
+                _touch_start_time = new Date().getTime();
+                _fingers = countFingers(event);
+                _first = true;
+                _event_start = event;
+
+                // borrowed from jquery offset https://github.com/jquery/jquery/blob/master/src/offset.js
+                var box = element.getBoundingClientRect();
+                var clientTop  = element.clientTop  || document.body.clientTop  || 0;
+                var clientLeft = element.clientLeft || document.body.clientLeft || 0;
+                var scrollTop  = window.pageYOffset || element.scrollTop  || document.body.scrollTop;
+                var scrollLeft = window.pageXOffset || element.scrollLeft || document.body.scrollLeft;
+
+                _offset = {
+                    top: box.top + scrollTop - clientTop,
+                    left: box.left + scrollLeft - clientLeft
+                };
+
+                _mousedown = true;
+
+                // hold gesture
+                gestures.hold(event);
+
+                if(options.prevent_default) {
+                    cancelEvent(event);
+                }
+                break;
+
+            case 'mousemove':
+            case 'touchmove':
+                if(!_mousedown) {
+                    return false;
+                }
+                _event_move = event;
+                _pos.move = getXYfromEvent(event);
+
+                if(!gestures.transform(event)) {
+                    gestures.drag(event);
+                }
+                break;
+
+            case 'mouseup':
+            case 'mouseout':
+            case 'touchcancel':
+            case 'touchend':
+                if(!_mousedown || (_gesture != 'transform' && event.touches && event.touches.length > 0)) {
+                    return false;
+                }
+
+                _mousedown = false;
+                _event_end = event;
+
+                // drag gesture
+                // dragstart is triggered, so dragend is possible
+                if(_gesture == 'drag') {
+                    triggerEvent("dragend", {
+                        originalEvent   : event,
+                        direction       : _direction,
+                        distance        : _distance,
+                        angle           : _angle
+                    });
+                }
+
+                // transform
+                // transformstart is triggered, so transformed is possible
+                else if(_gesture == 'transform') {
+                    triggerEvent("transformend", {
+                        originalEvent   : event,
+                        position        : _pos.center,
+                        scale           : event.scale,
+                        rotation        : event.rotation
+                    });
+                }
+                else {
+                    gestures.tap(_event_start);
+                }
+
+                _prev_gesture = _gesture;
+
+                // reset vars
+                reset();
+                break;
+        }
+    }
+
+
+    // bind events for touch devices
+    // except for windows phone 7.5, it doesnt support touch events..!
+    if('ontouchstart' in window) {
+        element.addEventListener("touchstart", handleEvents, false);
+        element.addEventListener("touchmove", handleEvents, false);
+        element.addEventListener("touchend", handleEvents, false);
+        element.addEventListener("touchcancel", handleEvents, false);
+    }
+    // for non-touch
+    else {
+
+        if(element.addEventListener){ // prevent old IE errors
+            element.addEventListener("mouseout", function(event) {
+                if(!isInsideHammer(element, event.relatedTarget)) {
+                    handleEvents(event);
+                }
+            }, false);
+            element.addEventListener("mouseup", handleEvents, false);
+            element.addEventListener("mousedown", handleEvents, false);
+            element.addEventListener("mousemove", handleEvents, false);
+
+            // events for older IE
+        }else if(document.attachEvent){
+            element.attachEvent("onmouseout", function(event) {
+                if(!isInsideHammer(element, event.relatedTarget)) {
+                    handleEvents(event);
+                }
+            }, false);
+            element.attachEvent("onmouseup", handleEvents);
+            element.attachEvent("onmousedown", handleEvents);
+            element.attachEvent("onmousemove", handleEvents);
+        }
+    }
+
+
+    /**
+     * find if element is (inside) given parent element
+     * @param   object  element
+     * @param   object  parent
+     * @return  bool    inside
+     */
+    function isInsideHammer(parent, child) {
+        // get related target for IE
+        if(!child && window.event && window.event.toElement){
+            child = window.event.toElement;
+        }
+
+        if(parent === child){
+            return true;
+        }
+
+        // loop over parentNodes of child until we find hammer element
+        if(child){
+            var node = child.parentNode;
+            while(node !== null){
+                if(node === parent){
+                    return true;
+                };
+                node = node.parentNode;
+            }
+        }
+        return false;
+    }
+
+
+    /**
+     * merge 2 objects into a new object
+     * @param   object  obj1
+     * @param   object  obj2
+     * @return  object  merged object
+     */
+    function mergeObject(obj1, obj2) {
+        var output = {};
+
+        if(!obj2) {
+            return obj1;
+        }
+
+        for (var prop in obj1) {
+            if (prop in obj2) {
+                output[prop] = obj2[prop];
+            } else {
+                output[prop] = obj1[prop];
+            }
+        }
+        return output;
+    }
+
+    function isFunction( obj ){
+        return Object.prototype.toString.call( obj ) == "[object Function]";
+    }
+}
\ No newline at end of file