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jquery.pep.js
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jquery.pep.js
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/*
* ________ ________
* ______(_)_____ ____ __________________ __ _____________________ ______(_)_______
* _____ /_ __ `/ / / / _ \_ ___/_ / / / ___ __ \ _ \__ __ \ _____ /__ ___/
* ____ / / /_/ // /_/ // __/ / _ /_/ /____ /_/ / __/_ /_/ /______ / _(__ )
* ___ / \__, / \__,_/ \___//_/ _\__, /_(_) .___/\___/_ .___/_(_)__ / /____/
* /___/ /_/ /____/ /_/ /_/ /___/
*
* http://pep.briangonzalez.org
* Kinetic drag for mobile/desktop.
*
* Copyright (c) 2014 Brian Gonzalez
* Licensed under the MIT license.
*
* Title generated using "Speed" @
* http://patorjk.com/software/taag/#p=display&f=Speed&t=jquery.pep.js
*/
;(function ( $, window, undefined ) {
"use strict";
// create the defaults once
var pluginName = 'pep';
var defaults = {
// Options
// ----------------------------------------------------------------------------------------------
// See ** https://github.com/briangonzalez/jquery.pep.js ** for fully documented options.
// It was too hard to manage options here and in the readme.
// ----------------------------------------------------------------------------------------------
initiate: function(){},
start: function(){},
drag: function(){},
stop: function(){},
easing: null,
rest: function(){},
moveTo: false,
callIfNotStarted: ['stop', 'rest'],
startThreshold: [0,0],
grid: [1,1],
debug: false,
activeClass: 'pep-active',
startClass: 'pep-start',
easeClass: 'pep-ease',
multiplier: 1,
velocityMultiplier: 2.5,
shouldPreventDefault: true,
allowDragEventPropagation: true,
stopEvents: '',
hardwareAccelerate: true,
useCSSTranslation: true,
disableSelect: true,
cssEaseString: "cubic-bezier(0.190, 1.000, 0.220, 1.000)",
cssEaseDuration: 1000,
shouldEase: true,
droppable: false,
droppableActiveClass: 'pep-dpa',
overlapFunction: false,
constrainTo: false,
removeMargins: true,
place: true,
deferPlacement: false,
axis: null,
forceNonCSS3Movement: false,
elementsWithInteraction: 'input',
revert: false,
revertAfter: 'stop',
revertIf: function(){ return true; },
ignoreRightClick: true,
startPos: {
left: null,
top: null
},
useBoundingClientRect: false
};
// ---------------------------------
// ----- Our main Pep object -----
// ---------------------------------
function Pep( el, options ) {
this.name = pluginName;
// reference to our DOM object
// and it's jQuery equivalent.
this.el = el;
this.$el = $(el);
// merge in defaults
this.options = $.extend( {}, defaults, options) ;
// store document/body so we don't need to keep grabbing them
// throughout the code
this.$document = $(this.$el[0].ownerDocument);
this.$body = this.$document.find('body');
// Create our triggers based on touch/click device
this.moveTrigger = "MSPointerMove pointermove touchmove mousemove";
this.startTrigger = "MSPointerDown pointerdown touchstart mousedown";
this.stopTrigger = "MSPointerUp pointerup touchend mouseup";
this.startTriggerArray = this.startTrigger.split(' ');
this.moveTriggerArray = this.moveTrigger.split(' ');
this.stopTriggerArray = this.stopTrigger.split(' ');
this.stopEvents = [ this.stopTrigger, this.options.stopEvents ].join(' ');
if ( this.options.constrainTo === 'window' )
this.$container = this.$document;
else if ( this.options.constrainTo && (this.options.constrainTo !== 'parent') )
this.$container = $(this.options.constrainTo);
else
this.$container = this.$el.parent();
// IE need this
if ( this.isPointerEventCompatible() )
this.applyMSDefaults();
this.CSSEaseHash = this.getCSSEaseHash();
this.scale = 1;
this.started = false;
this.disabled = false;
this.autoAxis = false;
this.activeDropRegions = [];
this.resetVelocityQueue();
this.init();
return this;
}
// init();
// initialization logic
// you already have access to the DOM el and the options via the instance,
// e.g., this.el and this.options
Pep.prototype.init = function () {
if ( this.options.debug )
this.buildDebugDiv();
if ( this.options.disableSelect )
this.disableSelect();
// position the parent & place the object, if necessary.
if ( this.options.place && !this.options.deferPlacement ) {
this.positionParent();
this.placeObject();
}
this.ev = {}; // to store our event movements
this.pos = {}; // to store positions
this.subscribe();
};
// subscribe();
// useful in the event we want to programmatically
// interact with our Pep object.
// e.g.: $('#pep').trigger('stop')
Pep.prototype.subscribe = function () {
var self = this;
// Subscribe to our start event
this.onStartEvent = function(ev){ self.handleStart(ev); };
this.$el.on(this.startTrigger, this.onStartEvent);
// Add a flag to events that start on elements that should allow interaction
// so handleStart() can ignore them but allow them to bubble up through the DOM
this.onStartEventOnElementsWithInteraction = function(ev){ ev.ignorePropagation = true; };
this.$el.on(
this.startTrigger,
this.options.elementsWithInteraction,
this.onStartEventOnElementsWithInteraction
);
// Subscribe to our stop event
this.onStopEvents = function(ev) { self.handleStop(ev); };
this.$document.on(this.stopEvents, this.onStopEvents);
// Subscribe to our move event
this.onMoveEvents = function(ev){ self.moveEvent = ev; };
this.$document.on(this.moveTrigger, this.onMoveEvents);
};
Pep.prototype.unsubscribe = function() {
this.$el.off(this.startTrigger, this.onStartEvent);
this.$el.off(
this.startTrigger,
this.options.elementsWithInteraction,
this.onStartEventOnElementsWithInteraction
);
this.$document.off(this.stopEvents, this.onStopEvents);
this.$document.off(this.moveTrigger, this.onMoveEvents);
};
// handleStart();
// once this.startTrigger occurs, handle all of the logic
// that must go on. This is where Pep's heavy lifting is done.
Pep.prototype.handleStart = function(ev) {
// ignorePropagation is set to true if the event originates from an element
// listed in this.options.elementsWithInteraction
if (ev.ignorePropagation) return;
var self = this;
// only continue chugging if our start event is a valid move event.
if ( this.isValidMoveEvent(ev) && !this.disabled ){
if( !(this.options.ignoreRightClick && ev.which === 3) ) {
// IE10 Hack. Me not happy.
if ( this.isPointerEventCompatible() && ev.preventManipulation )
ev.preventManipulation();
// normalize event
ev = this.normalizeEvent(ev);
// position the parent & place the object, if necessary.
if ( this.options.place && this.options.deferPlacement ) {
this.positionParent();
this.placeObject();
}
// log it
this.log({ type: 'event', event: ev.type });
// hardware accelerate, if necessary.
if ( this.options.hardwareAccelerate && !this.hardwareAccelerated ) {
this.hardwareAccelerate();
this.hardwareAccelerated = true;
}
// fire user's initiate event.
var shouldContinue = this.options.initiate.call(this, ev, this);
if ( shouldContinue === false )
return;
// cancel the rest timeout
clearTimeout( this.restTimeout );
// add active class and reset css animation, if necessary
this.$el.addClass( this.options.activeClass );
this.removeCSSEasing();
// store event's x & y values for later use
this.startX = this.ev.x = ev.pep.x;
this.startY = this.ev.y = ev.pep.y;
// store initial offset.
this.initialPosition = this.initialPosition || this.$el.position();
// store the initial touch/click event, used to calculate the inital delta values.
this.startEvent = this.moveEvent = ev;
// make object active, so watchMoveLoop starts looping.
this.active = true;
// preventDefault(), is necessary
if ( this.options.shouldPreventDefault )
ev.preventDefault();
// allow / disallow event bubbling
if ( !this.options.allowDragEventPropagation )
ev.stopPropagation();
// animation loop to ensure we don't fire
// too many unneccessary repaints
(function watchMoveLoop(){
if ( !self.active ) return;
self.handleMove();
self.requestAnimationFrame( watchMoveLoop );
})();
(function watchEasingLoop(){
if ( !self.options.easing ) return;
if ( self.easing ) self.options.easing.call(self, null, self);
self.requestAnimationFrame( watchEasingLoop );
})();
}
}
};
// handleMove();
// the logic for when the move events occur
Pep.prototype.handleMove = function() {
// setup our event object
if ( typeof(this.moveEvent) === 'undefined' )
return;
// get our move event's x & y
var ev = this.normalizeEvent( this.moveEvent );
var curX = window.parseInt(ev.pep.x / this.options.grid[0]) * this.options.grid[0];
var curY = window.parseInt(ev.pep.y / this.options.grid[1]) * this.options.grid[1];
// last in, first out (LIFO) queue to help us manage velocity
this.addToLIFO( { time: ev.timeStamp, x: curX, y: curY } );
// calculate values necessary to moving
var dx, dy;
if ( $.inArray( ev.type, this.startTriggerArray ) > -1 ){
dx = 0;
dy = 0;
} else{
dx = curX - this.ev.x;
dy = curY - this.ev.y;
}
this.dx = dx;
this.dy = dy;
this.ev.x = curX;
this.ev.y = curY;
// no movement in either direction -- so return
if (dx === 0 && dy === 0){
this.log({ type: 'event', event: '** stopped **' });
return;
}
// check if object has moved past X/Y thresholds
// if so, fire users start event
var initialDx = Math.abs(this.startX - curX);
var initialDy = Math.abs(this.startY - curY);
if ( !this.started && ( initialDx > this.options.startThreshold[0] || initialDy > this.options.startThreshold[1] ) ){
this.started = true;
this.$el.addClass(this.options.startClass);
this.options.start.call(this, this.startEvent, this);
}
// Move before calculate position and fire events
this.doMoveTo(dx, dy);
// Calculate our drop regions
if ( this.options.droppable ) {
this.calculateActiveDropRegions();
}
// fire user's drag event.
var continueDrag = this.options.drag.call(this, ev, this);
if ( continueDrag === false ) {
this.resetVelocityQueue();
return;
}
// log the move trigger & event position
this.log({ type: 'event', event: ev.type });
this.log({ type: 'event-coords', x: this.ev.x, y: this.ev.y });
this.log({ type: 'velocity' });
};
Pep.prototype.doMoveTo = function(dx, dy) {
var hash = this.handleConstraint(dx, dy);
var xOp, yOp;
// if using the "auto" axis, determine which axis to use based on
// whether the user has dragged more along the x or the y axis
if ( this.options.axis === 'auto' && !this.autoAxis) {
if ( Math.abs(dx) > Math.abs(dy) ) this.autoAxis = 'x';
else
if ( Math.abs(dx) < Math.abs(dy) ) this.autoAxis = 'y';
// don't move at all if the axis can't be determined
else {
dy = 0;
dx = 0;
}
}
// if using not using CSS transforms, move object via absolute position
if ( typeof this.options.moveTo === 'function') {
xOp = ( dx >= 0 ) ? "+=" + Math.abs(dx/this.scale)*this.options.multiplier : "-=" + Math.abs(dx/this.scale)*this.options.multiplier;
yOp = ( dy >= 0 ) ? "+=" + Math.abs(dy/this.scale)*this.options.multiplier : "-=" + Math.abs(dy/this.scale)*this.options.multiplier;
if ( this.options.constrainTo ) {
xOp = (hash.x !== false) ? hash.x : xOp;
yOp = (hash.y !== false) ? hash.y : yOp;
}
// only move along single axis, if necessary
if ( this.options.axis === 'x' || this.autoAxis === 'x' ) yOp = hash.y;
if ( this.options.axis === 'y' || this.autoAxis === 'y' ) xOp = hash.x;
this.options.moveTo.call(this, xOp, yOp);
} else if ( !this.shouldUseCSSTranslation() ){
xOp = ( dx >= 0 ) ? "+=" + Math.abs(dx/this.scale)*this.options.multiplier : "-=" + Math.abs(dx/this.scale)*this.options.multiplier;
yOp = ( dy >= 0 ) ? "+=" + Math.abs(dy/this.scale)*this.options.multiplier : "-=" + Math.abs(dy/this.scale)*this.options.multiplier;
if ( this.options.constrainTo ) {
xOp = (hash.x !== false) ? hash.x : xOp;
yOp = (hash.y !== false) ? hash.y : yOp;
}
// only move along single axis, if necessary
if ( this.options.axis === 'x' || this.autoAxis === 'x' ) yOp = hash.y;
if ( this.options.axis === 'y' || this.autoAxis === 'y' ) xOp = hash.x;
this.moveTo(xOp, yOp);
}
else {
dx = (dx/this.scale)*this.options.multiplier;
dy = (dy/this.scale)*this.options.multiplier;
if ( this.options.constrainTo ) {
dx = (hash.x === false) ? dx : 0 ;
dy = (hash.y === false) ? dy : 0 ;
}
// only move along single axis, if necessary
if ( this.options.axis === 'x' || this.autoAxis === 'x' ) dy = 0;
if ( this.options.axis === 'y' || this.autoAxis === 'y' ) dx = 0;
this.moveToUsingTransforms( dx, dy );
}
};
// handleStop();
// the logic for when the stop events occur
Pep.prototype.handleStop = function(ev) {
// no need to handle stop event if we're not active
if (!this.active)
return;
// log it
this.log({ type: 'event', event: ev.type });
// make object inactive, so watchMoveLoop returns
this.active = false;
// make object easing.
this.easing = true;
// remove our start class
this.$el.removeClass(this.options.startClass)
.addClass(this.options.easeClass);
// Calculate our drop regions
if ( this.options.droppable ) {
this.calculateActiveDropRegions();
}
// fire user's stop event.
if ( this.started || (!this.started && $.inArray('stop', this.options.callIfNotStarted) > -1 ) ) {
this.options.stop.call(this, ev, this);
}
// ease the object, if necessary.
if (this.options.shouldEase) {
this.ease(ev, this.started);
} else {
this.removeActiveClass();
}
if ( this.options.revert && (this.options.revertAfter === 'stop' || !this.options.shouldEase) && ( this.options.revertIf && this.options.revertIf.call(this) ) ) {
this.revert();
}
// this must be set to false after
// the user's stop event is called, so the dev
// has access to it.
this.started = false;
// reset the auto-axis
if ( this.autoAxis ) this.autoAxis = false;
// reset the velocity queue
this.resetVelocityQueue();
};
// ease();
// used in conjunction with the LIFO queue
// to ease the object after stop
Pep.prototype.ease = function(ev, started){
var pos = this.$el.position();
var vel = this.velocity();
var dt = this.dt;
var x = (vel.x/this.scale) * this.options.multiplier;
var y = (vel.y/this.scale) * this.options.multiplier;
var hash = this.handleConstraint(x, y, true);
// ✪ Apply the CSS3 animation easing magic ✪
if ( this.cssAnimationsSupported() )
this.$el.css( this.getCSSEaseHash() );
var xOp = ( vel.x > 0 ) ? "+=" + x : "-=" + Math.abs(x);
var yOp = ( vel.y > 0 ) ? "+=" + y : "-=" + Math.abs(y);
if ( this.options.constrainTo ) {
xOp = (hash.x !== false) ? hash.x : xOp;
yOp = (hash.y !== false) ? hash.y : yOp;
}
if ( this.options.axis === 'x' || this.autoAxis === 'x' ) yOp = "+=0";
if ( this.options.axis === 'y' || this.autoAxis === 'y' ) xOp = "+=0";
// ease it via JS, the last true tells it to animate.
var jsAnimateFallback = !this.cssAnimationsSupported() || this.options.forceNonCSS3Movement;
if (typeof this.options.moveTo === 'function') {
this.options.moveTo.call(this, xOp, yOp);
} else {
this.moveTo(xOp, yOp, jsAnimateFallback);
}
// when the rest occurs, remove active class and call
// user's rest event.
var self = this;
this.restTimeout = setTimeout( function(){
// Calculate our drop regions
if ( self.options.droppable ) {
self.calculateActiveDropRegions();
}
self.easing = false;
// call users rest event.
if ( started || ( !started && $.inArray('rest', self.options.callIfNotStarted) > -1 ) ) {
self.options.rest.call(self, ev, self);
}
// revert thy self!
if ( self.options.revert && (self.options.revertAfter === 'ease' && self.options.shouldEase) && ( self.options.revertIf && self.options.revertIf.call(self) ) ) {
self.revert();
}
// remove active class
self.removeActiveClass();
}, this.options.cssEaseDuration );
};
// normalizeEvent()
Pep.prototype.normalizeEvent = function(ev) {
ev.pep = {};
if ( this.isTouch(ev) ) {
ev.pep.x = ev.originalEvent.touches[0].pageX;
ev.pep.y = ev.originalEvent.touches[0].pageY;
ev.pep.type = ev.type;
}
else if ( this.isPointerEventCompatible() || !this.isTouch(ev) ) {
if ( ev.pageX ) {
ev.pep.x = ev.pageX;
ev.pep.y = ev.pageY;
} else {
ev.pep.x = ev.originalEvent.pageX;
ev.pep.y = ev.originalEvent.pageY;
}
ev.pep.type = ev.type;
}
return ev;
};
// resetVelocityQueue()
//
Pep.prototype.resetVelocityQueue = function() {
this.velocityQueue = new Array(5);
};
// moveTo();
// move the object to an x and/or y value
// using jQuery's .css function -- this fxn uses the
// .css({top: "+=20", left: "-=30"}) syntax
Pep.prototype.moveTo = function(x,y, animate) {
this.log({ type: 'delta', x: x, y: y });
if ( animate ) {
this.$el.animate({ top: y, left: x }, 0, 'easeOutQuad', {queue: false});
} else{
this.$el.stop(true, false).css({ top: y , left: x });
}
};
// moveToUsingTransforms();
// move the object to an x and/or y value
Pep.prototype.moveToUsingTransforms = function(x,y) {
// Check for our initial values if we don't have them.
var matrixArray = this.matrixToArray( this.matrixString() );
if ( !this.cssX )
this.cssX = this.xTranslation( matrixArray );
if ( !this.cssY )
this.cssY = this.yTranslation( matrixArray );
// CSS3 transforms are additive from current position
this.cssX = this.cssX + x;
this.cssY = this.cssY + y;
this.log({ type: 'delta', x: x, y: y });
matrixArray[4] = this.cssX;
matrixArray[5] = this.cssY;
this.translation = this.arrayToMatrix( matrixArray );
this.transform( this.translation );
};
Pep.prototype.transform = function(value) {
this.$el.css({
'-webkit-transform': value,
'-moz-transform': value,
'-ms-transform': value,
'-o-transform': value,
'transform': value });
};
Pep.prototype.xTranslation = function(matrixArray) {
matrixArray = matrixArray || this.matrixToArray( this.matrixString() );
return parseInt(matrixArray[4], 10);
};
Pep.prototype.yTranslation = function(matrixArray) {
matrixArray = matrixArray || this.matrixToArray( this.matrixString() );
return parseInt(matrixArray[5], 10);
};
// 3 helper functions for working with the
// objects CSS3 transforms
// matrixString
// matrixToArray
// arrayToMatrix
Pep.prototype.matrixString = function() {
var validMatrix = function(o){
return !( !o || o === 'none' || o.indexOf('matrix') < 0 );
};
var matrix = "matrix(1, 0, 0, 1, 0, 0)";
if ( validMatrix( this.$el.css('-webkit-transform') ) )
matrix = this.$el.css('-webkit-transform');
if ( validMatrix( this.$el.css('-moz-transform') ) )
matrix = this.$el.css('-moz-transform');
if ( validMatrix( this.$el.css('-ms-transform') ) )
matrix = this.$el.css('-ms-transform');
if ( validMatrix( this.$el.css('-o-transform') ) )
matrix = this.$el.css('-o-transform');
if ( validMatrix( this.$el.css('transform') ) )
matrix = this.$el.css('transform');
return matrix;
};
Pep.prototype.matrixToArray = function(str) {
return str.split('(')[1].split(')')[0].split(',');
};
Pep.prototype.arrayToMatrix = function(array) {
return "matrix(" + array.join(',') + ")";
};
// addToLIFO();
// a Last-In/First-Out array of the 5 most recent
// velocity points, which is used for easing
Pep.prototype.addToLIFO = function(val){
// last in, first out
var arr = this.velocityQueue;
arr = arr.slice(1, arr.length);
arr.push(val);
this.velocityQueue = arr;
};
// velocity();
// using the LIFO, calculate velocity and return
// velocity in each direction (x & y)
Pep.prototype.velocity = function(){
var sumX = 0;
var sumY = 0;
for ( var i = 0; i < this.velocityQueue.length -1; i++ ){
if ( this.velocityQueue[i] ){
sumX += (this.velocityQueue[i+1].x - this.velocityQueue[i].x);
sumY += (this.velocityQueue[i+1].y - this.velocityQueue[i].y);
this.dt = ( this.velocityQueue[i+1].time - this.velocityQueue[i].time );
}
}
// return velocity in each direction.
return { x: sumX*this.options.velocityMultiplier, y: sumY*this.options.velocityMultiplier};
};
Pep.prototype.revert = function() {
if ( this.shouldUseCSSTranslation() ){
this.moveToUsingTransforms(-this.xTranslation(),-this.yTranslation());
}
if (this.options.place) {
this.moveTo(this.initialPosition.left, this.initialPosition.top);
}
};
// requestAnimationFrame();
// requestAnimationFrame Polyfill
// More info:
// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
Pep.prototype.requestAnimationFrame = function(callback) {
return window.requestAnimationFrame && window.requestAnimationFrame(callback) ||
window.webkitRequestAnimationFrame && window.webkitRequestAnimationFrame(callback) ||
window.mozRequestAnimationFrame && window.mozRequestAnimationFrame(callback) ||
window.oRequestAnimationFrame && window.mozRequestAnimationFrame(callback) ||
window.msRequestAnimationFrame && window.msRequestAnimationFrame(callback) ||
window.setTimeout(callback, 1000 / 60);
};
// positionParent();
// add the right positioning to the parent object
Pep.prototype.positionParent = function() {
if ( !this.options.constrainTo || this.parentPositioned )
return;
this.parentPositioned = true;
// make `relative` parent if necessary
if ( this.options.constrainTo === 'parent' ) {
this.$container.css({ position: 'relative' });
} else if ( this.options.constrainTo === 'window' &&
this.$container.get(0).nodeName !== "#document" &&
this.$container.css('position') !== 'static' )
{
this.$container.css({ position: 'static' });
}
};
// placeObject();
// add the right positioning to the object
Pep.prototype.placeObject = function() {
if ( this.objectPlaced )
return;
this.objectPlaced = true;
this.offset = (this.options.constrainTo === 'parent' || this.hasNonBodyRelative() ) ?
this.$el.position() : this.$el.offset();
// better to leave absolute position alone if
// it already has one.
if ( parseInt( this.$el.css('left'), 10 ) )
this.offset.left = this.$el.css('left');
if (typeof this.options.startPos.left === "number")
this.offset.left = this.options.startPos.left;
if ( parseInt( this.$el.css('top'), 10 ) )
this.offset.top = this.$el.css('top');
if (typeof this.options.startPos.top === "number")
this.offset.top = this.options.startPos.top;
if ( this.options.removeMargins )
this.$el.css({margin: 0});
this.$el.css({
position: 'absolute',
top: this.offset.top,
left: this.offset.left
});
};
// hasNonBodyRelative()
// returns true if any parent other than the body
// has relative positioning
Pep.prototype.hasNonBodyRelative = function() {
return this.$el.parents().filter(function() {
var $this = $(this);
return $this.is('body') || $this.css('position') === 'relative';
}).length > 1;
};
// setScale()
// set the scale of the object being moved.
Pep.prototype.setScale = function(val) {
this.scale = val;
};
// setMultiplier()
// set the multiplier of the object being moved.
Pep.prototype.setMultiplier = function(val) {
this.options.multiplier = val;
};
// removeCSSEasing();
// remove CSS easing properties, if necessary
Pep.prototype.removeCSSEasing = function() {
if ( this.cssAnimationsSupported() )
this.$el.css( this.getCSSEaseHash(true) );
};
// disableSelect();
// add the property which causes the object
// to not be selected user drags over text areas
Pep.prototype.disableSelect = function() {
this.$el.css({
'-webkit-touch-callout' : 'none',
'-webkit-user-select' : 'none',
'-khtml-user-select' : 'none',
'-moz-user-select' : 'none',
'-ms-user-select' : 'none',
'user-select' : 'none'
});
};
// removeActiveClass()
// Removes the active class.
Pep.prototype.removeActiveClass = function() {
this.$el.removeClass( [this.options.activeClass, this.options.easeClass].join(' ') );
};
// handleConstraint();
// returns a hash of where to move to
// when we constrain to parent/window
Pep.prototype.handleConstraint = function(dx, dy, accountForTranslation) {
var pos = this.$el.position();
this.pos.x = pos.left;
this.pos.y = pos.top;
var hash = { x: false, y: false };
var upperYLimit, upperXLimit, lowerXLimit, lowerYLimit;
// log our positions
this.log({ type: "pos-coords", x: this.pos.x, y: this.pos.y});
if ( $.isArray( this.options.constrainTo ) ) {
if ( this.options.constrainTo[3] !== undefined && this.options.constrainTo[1] !== undefined ) {
upperXLimit = this.options.constrainTo[1] === false ? Infinity : this.options.constrainTo[1];
lowerXLimit = this.options.constrainTo[3] === false ? -Infinity : this.options.constrainTo[3];
}
if ( this.options.constrainTo[0] !== false && this.options.constrainTo[2] !== false ) {
upperYLimit = this.options.constrainTo[2] === false ? Infinity : this.options.constrainTo[2];
lowerYLimit = this.options.constrainTo[0] === false ? -Infinity : this.options.constrainTo[0];
}
// is our object trying to move outside lower X & Y limits?
if ( this.pos.x + dx < lowerXLimit) hash.x = lowerXLimit;
if ( this.pos.y + dy < lowerYLimit) hash.y = lowerYLimit;
} else if ( typeof this.options.constrainTo === 'string' ) {
lowerXLimit = 0;
lowerYLimit = 0;
upperXLimit = this.$container.width() - (this.options.useBoundingClientRect ? this.$el[0].getBoundingClientRect().width : this.$el.outerWidth());
upperYLimit = this.$container.height() - (this.options.useBoundingClientRect ? this.$el[0].getBoundingClientRect().height : this.$el.outerHeight());
// is our object trying to move outside lower X & Y limits?
if ( this.pos.x + dx < 0 ) hash.x = 0;
if ( this.pos.y + dy < 0 ) hash.y = 0;
}
// is our object trying to move outside upper X & Y limits?
if ( this.pos.x + dx > upperXLimit ) hash.x = upperXLimit;
if ( this.pos.y + dy > upperYLimit ) hash.y = upperYLimit;
// Account for translation, which makes movement a little tricky.
if ( this.shouldUseCSSTranslation() && accountForTranslation ){
if (hash.x === lowerXLimit && this.xTranslation() ) hash.x = lowerXLimit - this.xTranslation();
if (hash.x === upperXLimit && this.xTranslation() ) hash.x = upperXLimit - this.xTranslation();
if (hash.y === lowerYLimit && this.yTranslation() ) hash.y = lowerYLimit - this.yTranslation();
if (hash.y === upperYLimit && this.yTranslation() ) hash.y = upperYLimit - this.yTranslation();
}
return hash;
};
// getCSSEaseHash();
// returns a hash of params used in conjunction
// with this.options.cssEaseString
Pep.prototype.getCSSEaseHash = function(reset){
if ( typeof(reset) === 'undefined' ) reset = false;
var cssEaseString;
if (reset){
cssEaseString = '';
} else if ( this.CSSEaseHash ) {
return this.CSSEaseHash;
} else {
cssEaseString = ['all', this.options.cssEaseDuration + 'ms', this.options.cssEaseString].join(' ');
}
return {
'-webkit-transition' : cssEaseString, // chrome, safari, etc.
'-moz-transition' : cssEaseString, // firefox
'-ms-transition' : cssEaseString, // microsoft
'-o-transition' : cssEaseString, // opera
'transition' : cssEaseString // future
};
};
// calculateActiveDropRegions()
// sets parent droppables of this.
Pep.prototype.calculateActiveDropRegions = function() {
var self = this;
this.activeDropRegions.length = 0;
$.each( $(this.options.droppable), function(idx, el){
var $el = $(el);
if ( self.isOverlapping($el, self.$el) ){
$el.addClass(self.options.droppableActiveClass);
self.activeDropRegions.push($el);
} else {
$el.removeClass(self.options.droppableActiveClass);
}
});
};
// isOverlapping();
// returns true if element a over
Pep.prototype.isOverlapping = function($a,$b) {
if ( this.options.overlapFunction ) {
return this.options.overlapFunction($a,$b);
}
var rect1 = $a[0].getBoundingClientRect();
var rect2 = $b[0].getBoundingClientRect();
return !( rect1.right < rect2.left ||
rect1.left > rect2.right ||
rect1.bottom < rect2.top ||
rect1.top > rect2.bottom );
};
// isTouch();
// returns whether or not event is a touch event
Pep.prototype.isTouch = function(ev){
return ev.type.search('touch') > -1;
};
// isPointerEventCompatible();
// return whether or note our device is pointer
// event compatible; typically means where on a
// touch Win8 device
Pep.prototype.isPointerEventCompatible = function() {
return ("MSPointerEvent" in window);
};
// applyMSDefaults();
Pep.prototype.applyMSDefaults = function(first_argument) {
this.$el.css({
'-ms-touch-action' : 'none',
'touch-action' : 'none',
'-ms-scroll-chaining': 'none',
'-ms-scroll-limit': '0 0 0 0'
});
};
// isValidMoveEvent();
// returns true if we're on a non-touch device -- or --
// if the event is **single** touch event on a touch device
Pep.prototype.isValidMoveEvent = function(ev){
return ( !this.isTouch(ev) || ( this.isTouch(ev) && ev.originalEvent && ev.originalEvent.touches && ev.originalEvent.touches.length === 1 ) );
};
// shouldUseCSSTranslation();
// return true if we should use CSS transforms for move the object
Pep.prototype.shouldUseCSSTranslation = function() {
if ( this.options.forceNonCSS3Movement )
return false;
if ( typeof(this.useCSSTranslation) !== "undefined" )
return this.useCSSTranslation;
var useCSSTranslation = false;
if ( !this.options.useCSSTranslation || ( typeof(Modernizr) !== "undefined" && !Modernizr.csstransforms)){
useCSSTranslation = false;
}
else{
useCSSTranslation = true;
}
this.useCSSTranslation = useCSSTranslation;
return useCSSTranslation;
};