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// FINGERBLAST.js
// --------------
// Adapted from phantom limb by Brian Cartensen
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/* jshint bitwise: false */
/* global GLOBAL: true */
(function () {
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'use strict';
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function FingerBlast(element) {
this.element = typeof element === 'string' ? document.querySelector(element) : element;
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if (this.element) {
this.listen();
}
}
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FingerBlast.prototype = {
x: NaN,
y: NaN,
startDistance: NaN,
startAngle: NaN,
mouseIsDown: false,
listen: function () {
var activate = this.activate.bind(this);
var deactivate = this.deactivate.bind(this);
function contains (element, ancestor) {
var descendants, index, descendant;
if ('compareDocumentPosition' in ancestor) {
return !!(ancestor.compareDocumentPosition(element) & 16);
} else if ('contains' in ancestor) {
return ancestor !== element && ancestor.contains(element);
} else {
for ((descendants = ancestor.getElementsByTagName('*')), index = 0; (descendant = descendants[index++]);) {
if (descendant === element) {
return true;
}
}
return false;
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}
}
this.element.addEventListener('mouseover', function (e) {
var target = e.relatedTarget;
if (target !== this && !contains(target, this)) {
activate();
}
});
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this.element.addEventListener('mouseout', function (e) {
var target = e.relatedTarget;
if (target !== this && !contains(target, this)) {
deactivate(e);
}
});
},
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activate: function () {
if (this.active) {
return;
}
this.element.addEventListener('mousedown', (this.touchStart = this.touchStart.bind(this)), true);
this.element.addEventListener('mousemove', (this.touchMove = this.touchMove.bind(this)), true);
this.element.addEventListener('mouseup', (this.touchEnd = this.touchEnd.bind(this)), true);
this.element.addEventListener('click', (this.click = this.click.bind(this)), true);
this.active = true;
},
deactivate: function (e) {
this.active = false;
if (this.mouseIsDown) {
this.touchEnd(e);
}
this.element.removeEventListener('mousedown', this.touchStart, true);
this.element.removeEventListener('mousemove', this.touchMove, true);
this.element.removeEventListener('mouseup', this.touchEnd, true);
this.element.removeEventListener('click', this.click, true);
},
click: function (e) {
if (e.synthetic) {
return;
}
e.preventDefault();
e.stopPropagation();
},
touchStart: function (e) {
if (e.synthetic || /input|textarea/.test(e.target.tagName.toLowerCase())) {
return;
}
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this.mouseIsDown = true;
e.preventDefault();
e.stopPropagation();
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this.fireTouchEvents('touchstart', e);
},
touchMove: function (e) {
if (e.synthetic) {
return;
}
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e.preventDefault();
e.stopPropagation();
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this.move(e.clientX, e.clientY);
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if (this.mouseIsDown) {
this.fireTouchEvents('touchmove', e);
}
},
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touchEnd: function (e) {
if (e.synthetic) {
return;
}
this.mouseIsDown = false;
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e.preventDefault();
e.stopPropagation();
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this.fireTouchEvents('touchend', e);
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if (!this.target) {
return;
}
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// Mobile Safari moves all the mouse events to fire after the touchend event.
this.target.dispatchEvent(this.createMouseEvent('mouseover', e));
this.target.dispatchEvent(this.createMouseEvent('mousemove', e));
this.target.dispatchEvent(this.createMouseEvent('mousedown', e));
},
fireTouchEvents: function (eventName, originalEvent) {
var events = [];
var gestures = [];
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if (!this.target) {
return;
}
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// Convert 'ontouch*' properties and attributes to listeners.
var onEventName = 'on' + eventName;
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if (onEventName in this.target) {
console.warn('Converting `' + onEventName + '` property to event listener.', this.target);
this.target.addEventListener(eventName, this.target[onEventName], false);
delete this.target[onEventName];
}
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if (this.target.hasAttribute(onEventName)) {
console.warn('Converting `' + onEventName + '` attribute to event listener.', this.target);
var handler = new GLOBAL.Function('event', this.target.getAttribute(onEventName));
this.target.addEventListener(eventName, handler, false);
this.target.removeAttribute(onEventName);
}
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// Set up a new event with the coordinates of the finger.
var touch = this.createMouseEvent(eventName, originalEvent);
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events.push(touch);
// Figure out scale and rotation.
if (events.length > 1) {
var x = events[0].pageX - events[1].pageX;
var y = events[0].pageY - events[1].pageY;
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var distance = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2));
var angle = Math.atan2(x, y) * (180 / Math.PI);
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var gestureName = 'gesturechange';
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if (eventName === 'touchstart') {
gestureName = 'gesturestart';
this.startDistance = distance;
this.startAngle = angle;
}
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if (eventName === 'touchend') {
gestureName = 'gestureend';
}
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events.forEach(function(event) {
var gesture = this.createMouseEvent.call(event._finger, gestureName, event);
gestures.push(gesture);
}.bind(this));
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events.concat(gestures).forEach(function(event) {
event.scale = distance / this.startDistance;
event.rotation = this.startAngle - angle;
});
}
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// Loop through the events array and fill in each touch array.
events.forEach(function(touch) {
touch.touches = events.filter(function(e) {
return ~e.type.indexOf('touch') && e.type !== 'touchend';
});
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touch.changedTouches = events.filter(function(e) {
return ~e.type.indexOf('touch') && e._finger.target === touch._finger.target;
});
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touch.targetTouches = touch.changedTouches.filter(function(e) {
return ~e.type.indexOf('touch') && e.type !== 'touchend';
});
});
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// Then fire the events.
events.concat(gestures).forEach(function(event, i) {
event.identifier = i;
event._finger.target.dispatchEvent(event);
});
},
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createMouseEvent: function (eventName, originalEvent) {
var e = document.createEvent('MouseEvent');
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e.initMouseEvent(eventName, true, true,
originalEvent.view, originalEvent.detail,
this.x || originalEvent.screenX, this.y || originalEvent.screenY,
this.x || originalEvent.clientX, this.y || originalEvent.clientY,
originalEvent.ctrlKey, originalEvent.shiftKey,
originalEvent.altKey, originalEvent.metaKey,
originalEvent.button, this.target || originalEvent.relatedTarget
);
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e.synthetic = true;
e._finger = this;
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return e;
},
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move: function (x, y) {
if (isNaN(x) || isNaN(y)) {
this.target = null;
} else {
this.x = x;
this.y = y;
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if (!this.mouseIsDown) {
this.target = document.elementFromPoint(x, y);
}
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}
}
};
window.FingerBlast = FingerBlast;
}());