/*!
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* jquery.event.drag - v 2.2
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* Copyright (c) 2010 Three Dub Media - http://threedubmedia.com
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* Open Source MIT License - http://threedubmedia.com/code/license
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*/
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// Created: 2008-06-04
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// Updated: 2012-05-21
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// REQUIRES: jquery 1.7.x
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;(function( $ ){
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// add the jquery instance method
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$.fn.drag = function( str, arg, opts ){
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// figure out the event type
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var type = typeof str == "string" ? str : "",
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// figure out the event handler...
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fn = $.isFunction( str ) ? str : $.isFunction( arg ) ? arg : null;
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// fix the event type
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if ( type.indexOf("drag") !== 0 )
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type = "drag"+ type;
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// were options passed
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opts = ( str == fn ? arg : opts ) || {};
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// trigger or bind event handler
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return fn ? this.bind( type, opts, fn ) : this.trigger( type );
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};
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// local refs (increase compression)
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var $event = $.event,
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$special = $event.special,
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// configure the drag special event
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drag = $special.drag = {
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// these are the default settings
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defaults: {
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which: 1, // mouse button pressed to start drag sequence
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distance: 0, // distance dragged before dragstart
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not: ':input', // selector to suppress dragging on target elements
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handle: null, // selector to match handle target elements
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relative: false, // true to use "position", false to use "offset"
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drop: true, // false to suppress drop events, true or selector to allow
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click: false // false to suppress click events after dragend (no proxy)
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},
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// the key name for stored drag data
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datakey: "dragdata",
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// prevent bubbling for better performance
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noBubble: true,
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// count bound related events
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add: function( obj ){
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// read the interaction data
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var data = $.data( this, drag.datakey ),
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// read any passed options
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opts = obj.data || {};
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// count another realted event
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data.related += 1;
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// extend data options bound with this event
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// don't iterate "opts" in case it is a node
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$.each( drag.defaults, function( key, def ){
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if ( opts[ key ] !== undefined )
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data[ key ] = opts[ key ];
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});
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},
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// forget unbound related events
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remove: function(){
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$.data( this, drag.datakey ).related -= 1;
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},
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// configure interaction, capture settings
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setup: function(){
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// check for related events
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if ( $.data( this, drag.datakey ) )
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return;
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// initialize the drag data with copied defaults
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var data = $.extend({ related:0 }, drag.defaults );
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// store the interaction data
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$.data( this, drag.datakey, data );
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// bind the mousedown event, which starts drag interactions
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$event.add( this, "touchstart mousedown", drag.init, data );
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// prevent image dragging in IE...
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if ( this.attachEvent )
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this.attachEvent("ondragstart", drag.dontstart );
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},
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// destroy configured interaction
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teardown: function(){
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var data = $.data( this, drag.datakey ) || {};
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// check for related events
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if ( data.related )
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return;
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// remove the stored data
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$.removeData( this, drag.datakey );
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// remove the mousedown event
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$event.remove( this, "touchstart mousedown", drag.init );
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// enable text selection
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drag.textselect( true );
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// un-prevent image dragging in IE...
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if ( this.detachEvent )
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this.detachEvent("ondragstart", drag.dontstart );
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},
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// initialize the interaction
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init: function( event ){
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// sorry, only one touch at a time
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if ( drag.touched )
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return;
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// the drag/drop interaction data
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var dd = event.data, results;
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// check the which directive
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if ( event.which != 0 && dd.which > 0 && event.which != dd.which )
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return;
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// check for suppressed selector
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if ( $( event.target ).is( dd.not ) )
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return;
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// check for handle selector
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if ( dd.handle && !$( event.target ).closest( dd.handle, event.currentTarget ).length )
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return;
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drag.touched = event.type == 'touchstart' ? this : null;
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dd.propagates = 1;
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dd.mousedown = this;
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dd.interactions = [ drag.interaction( this, dd ) ];
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dd.target = event.target;
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dd.pageX = event.pageX;
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dd.pageY = event.pageY;
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dd.dragging = null;
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// handle draginit event...
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results = drag.hijack( event, "draginit", dd );
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// early cancel
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if ( !dd.propagates )
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return;
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// flatten the result set
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results = drag.flatten( results );
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// insert new interaction elements
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if ( results && results.length ){
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dd.interactions = [];
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$.each( results, function(){
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dd.interactions.push( drag.interaction( this, dd ) );
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});
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}
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// remember how many interactions are propagating
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dd.propagates = dd.interactions.length;
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// locate and init the drop targets
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if ( dd.drop !== false && $special.drop )
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$special.drop.handler( event, dd );
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// disable text selection
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drag.textselect( false );
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// bind additional events...
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if ( drag.touched )
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$event.add( drag.touched, "touchmove touchend", drag.handler, dd );
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else
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$event.add( document, "mousemove mouseup", drag.handler, dd );
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// helps prevent text selection or scrolling
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if ( !drag.touched || dd.live )
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return false;
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},
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// returns an interaction object
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interaction: function( elem, dd ){
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var offset = $( elem )[ dd.relative ? "position" : "offset" ]() || { top:0, left:0 };
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return {
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drag: elem,
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callback: new drag.callback(),
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droppable: [],
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offset: offset
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};
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},
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// handle drag-releatd DOM events
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handler: function( event ){
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// read the data before hijacking anything
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var dd = event.data;
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// handle various events
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switch ( event.type ){
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// mousemove, check distance, start dragging
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case !dd.dragging && 'touchmove':
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event.preventDefault();
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case !dd.dragging && 'mousemove':
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// drag tolerance, x² + y² = distance²
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if ( Math.pow( event.pageX-dd.pageX, 2 ) + Math.pow( event.pageY-dd.pageY, 2 ) < Math.pow( dd.distance, 2 ) )
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break; // distance tolerance not reached
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event.target = dd.target; // force target from "mousedown" event (fix distance issue)
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drag.hijack( event, "dragstart", dd ); // trigger "dragstart"
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if ( dd.propagates ) // "dragstart" not rejected
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dd.dragging = true; // activate interaction
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// mousemove, dragging
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case 'touchmove':
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event.preventDefault();
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case 'mousemove':
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if ( dd.dragging ){
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// trigger "drag"
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drag.hijack( event, "drag", dd );
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if ( dd.propagates ){
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// manage drop events
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if ( dd.drop !== false && $special.drop )
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$special.drop.handler( event, dd ); // "dropstart", "dropend"
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break; // "drag" not rejected, stop
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}
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event.type = "mouseup"; // helps "drop" handler behave
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}
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// mouseup, stop dragging
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case 'touchend':
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case 'mouseup':
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default:
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if ( drag.touched )
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$event.remove( drag.touched, "touchmove touchend", drag.handler ); // remove touch events
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else
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$event.remove( document, "mousemove mouseup", drag.handler ); // remove page events
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if ( dd.dragging ){
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if ( dd.drop !== false && $special.drop )
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$special.drop.handler( event, dd ); // "drop"
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drag.hijack( event, "dragend", dd ); // trigger "dragend"
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}
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drag.textselect( true ); // enable text selection
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// if suppressing click events...
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if ( dd.click === false && dd.dragging )
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$.data( dd.mousedown, "suppress.click", new Date().getTime() + 5 );
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dd.dragging = drag.touched = false; // deactivate element
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break;
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}
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},
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// re-use event object for custom events
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hijack: function( event, type, dd, x, elem ){
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// not configured
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if ( !dd )
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return;
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// remember the original event and type
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var orig = { event:event.originalEvent, type:event.type },
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// is the event drag related or drog related?
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mode = type.indexOf("drop") ? "drag" : "drop",
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// iteration vars
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result, i = x || 0, ia, $elems, callback,
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len = !isNaN( x ) ? x : dd.interactions.length;
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// modify the event type
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event.type = type;
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// remove the original event
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event.originalEvent = null;
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// initialize the results
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dd.results = [];
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// handle each interacted element
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do if ( ia = dd.interactions[ i ] ){
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// validate the interaction
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if ( type !== "dragend" && ia.cancelled )
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continue;
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// set the dragdrop properties on the event object
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callback = drag.properties( event, dd, ia );
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// prepare for more results
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ia.results = [];
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// handle each element
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$( elem || ia[ mode ] || dd.droppable ).each(function( p, subject ){
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// identify drag or drop targets individually
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callback.target = subject;
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// force propagtion of the custom event
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event.isPropagationStopped = function(){ return false; };
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// handle the event
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result = subject ? $event.dispatch.call( subject, event, callback ) : null;
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// stop the drag interaction for this element
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if ( result === false ){
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if ( mode == "drag" ){
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ia.cancelled = true;
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dd.propagates -= 1;
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}
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if ( type == "drop" ){
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ia[ mode ][p] = null;
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}
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}
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// assign any dropinit elements
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else if ( type == "dropinit" )
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ia.droppable.push( drag.element( result ) || subject );
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// accept a returned proxy element
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if ( type == "dragstart" )
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ia.proxy = $( drag.element( result ) || ia.drag )[0];
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// remember this result
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ia.results.push( result );
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// forget the event result, for recycling
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delete event.result;
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// break on cancelled handler
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if ( type !== "dropinit" )
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return result;
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});
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// flatten the results
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dd.results[ i ] = drag.flatten( ia.results );
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// accept a set of valid drop targets
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if ( type == "dropinit" )
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ia.droppable = drag.flatten( ia.droppable );
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// locate drop targets
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if ( type == "dragstart" && !ia.cancelled )
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callback.update();
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}
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while ( ++i < len )
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// restore the original event & type
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event.type = orig.type;
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event.originalEvent = orig.event;
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// return all handler results
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return drag.flatten( dd.results );
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},
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// extend the callback object with drag/drop properties...
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properties: function( event, dd, ia ){
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var obj = ia.callback;
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// elements
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obj.drag = ia.drag;
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obj.proxy = ia.proxy || ia.drag;
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// starting mouse position
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obj.startX = dd.pageX;
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obj.startY = dd.pageY;
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// current distance dragged
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obj.deltaX = event.pageX - dd.pageX;
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obj.deltaY = event.pageY - dd.pageY;
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// original element position
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obj.originalX = ia.offset.left;
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obj.originalY = ia.offset.top;
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// adjusted element position
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obj.offsetX = obj.originalX + obj.deltaX;
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obj.offsetY = obj.originalY + obj.deltaY;
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// assign the drop targets information
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obj.drop = drag.flatten( ( ia.drop || [] ).slice() );
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obj.available = drag.flatten( ( ia.droppable || [] ).slice() );
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return obj;
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},
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// determine is the argument is an element or jquery instance
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element: function( arg ){
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if ( arg && ( arg.jquery || arg.nodeType == 1 ) )
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return arg;
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},
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// flatten nested jquery objects and arrays into a single dimension array
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flatten: function( arr ){
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return $.map( arr, function( member ){
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return member && member.jquery ? $.makeArray( member ) :
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member && member.length ? drag.flatten( member ) : member;
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});
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},
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// toggles text selection attributes ON (true) or OFF (false)
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textselect: function( bool ){
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$( document )[ bool ? "unbind" : "bind" ]("selectstart", drag.dontstart )
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.css("MozUserSelect", bool ? "" : "none" );
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// .attr("unselectable", bool ? "off" : "on" )
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document.unselectable = bool ? "off" : "on";
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},
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// suppress "selectstart" and "ondragstart" events
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dontstart: function(){
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return false;
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},
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// a callback instance contructor
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callback: function(){}
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};
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// callback methods
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drag.callback.prototype = {
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update: function(){
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if ( $special.drop && this.available.length )
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$.each( this.available, function( i ){
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$special.drop.locate( this, i );
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});
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}
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};
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// patch $.event.$dispatch to allow suppressing clicks
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var $dispatch = $event.dispatch;
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$event.dispatch = function( event ){
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if ( $.data( this, "suppress."+ event.type ) - new Date().getTime() > 0 ){
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$.removeData( this, "suppress."+ event.type );
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return;
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}
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return $dispatch.apply( this, arguments );
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};
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// event fix hooks for touch events...
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var touchHooks =
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$event.fixHooks.touchstart =
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$event.fixHooks.touchmove =
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$event.fixHooks.touchend =
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$event.fixHooks.touchcancel = {
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props: "clientX clientY pageX pageY screenX screenY".split( " " ),
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filter: function( event, orig ) {
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if ( orig ){
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var touched = ( orig.touches && orig.touches[0] )
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|| ( orig.changedTouches && orig.changedTouches[0] )
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|| null;
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// iOS webkit: touchstart, touchmove, touchend
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if ( touched )
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$.each( touchHooks.props, function( i, prop ){
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event[ prop ] = touched[ prop ];
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});
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}
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return event;
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}
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};
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// share the same special event configuration with related events...
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$special.draginit = $special.dragstart = $special.dragend = drag;
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})( jQuery );
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