| 1 | /*! |
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| 2 | * jquery.event.drag - v 2.2 |
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| 3 | * Copyright (c) 2010 Three Dub Media - http://threedubmedia.com |
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| 4 | * Open Source MIT License - http://threedubmedia.com/code/license |
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| 5 | */ |
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| 6 | // Created: 2008-06-04 |
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| 7 | // Updated: 2012-05-21 |
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| 8 | // REQUIRES: jquery 1.7.x |
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| 9 | |
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| 10 | ;(function( $ ){ |
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| 11 | |
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| 12 | // add the jquery instance method |
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| 13 | $.fn.drag = function( str, arg, opts ){ |
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| 14 | // figure out the event type |
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| 15 | var type = typeof str == "string" ? str : "", |
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| 16 | // figure out the event handler... |
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| 17 | fn = $.isFunction( str ) ? str : $.isFunction( arg ) ? arg : null; |
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| 18 | // fix the event type |
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| 19 | if ( type.indexOf("drag") !== 0 ) |
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| 20 | type = "drag"+ type; |
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| 21 | // were options passed |
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| 22 | opts = ( str == fn ? arg : opts ) || {}; |
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| 23 | // trigger or bind event handler |
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| 24 | return fn ? this.bind( type, opts, fn ) : this.trigger( type ); |
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| 25 | }; |
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| 26 | |
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| 27 | // local refs (increase compression) |
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| 28 | var $event = $.event, |
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| 29 | $special = $event.special, |
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| 30 | // configure the drag special event |
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| 31 | drag = $special.drag = { |
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| 32 | |
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| 33 | // these are the default settings |
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| 34 | defaults: { |
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| 35 | which: 1, // mouse button pressed to start drag sequence |
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| 36 | distance: 0, // distance dragged before dragstart |
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| 37 | not: ':input', // selector to suppress dragging on target elements |
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| 38 | handle: null, // selector to match handle target elements |
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| 39 | relative: false, // true to use "position", false to use "offset" |
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| 40 | drop: true, // false to suppress drop events, true or selector to allow |
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| 41 | click: false // false to suppress click events after dragend (no proxy) |
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| 42 | }, |
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| 43 | |
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| 44 | // the key name for stored drag data |
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| 45 | datakey: "dragdata", |
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| 46 | |
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| 47 | // prevent bubbling for better performance |
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| 48 | noBubble: true, |
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| 49 | |
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| 50 | // count bound related events |
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| 51 | add: function( obj ){ |
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| 52 | // read the interaction data |
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| 53 | var data = $.data( this, drag.datakey ), |
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| 54 | // read any passed options |
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| 55 | opts = obj.data || {}; |
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| 56 | // count another realted event |
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| 57 | data.related += 1; |
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| 58 | // extend data options bound with this event |
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| 59 | // don't iterate "opts" in case it is a node |
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| 60 | $.each( drag.defaults, function( key, def ){ |
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| 61 | if ( opts[ key ] !== undefined ) |
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| 62 | data[ key ] = opts[ key ]; |
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| 63 | }); |
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| 64 | }, |
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| 65 | |
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| 66 | // forget unbound related events |
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| 67 | remove: function(){ |
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| 68 | $.data( this, drag.datakey ).related -= 1; |
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| 69 | }, |
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| 70 | |
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| 71 | // configure interaction, capture settings |
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| 72 | setup: function(){ |
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| 73 | // check for related events |
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| 74 | if ( $.data( this, drag.datakey ) ) |
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| 75 | return; |
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| 76 | // initialize the drag data with copied defaults |
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| 77 | var data = $.extend({ related:0 }, drag.defaults ); |
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| 78 | // store the interaction data |
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| 79 | $.data( this, drag.datakey, data ); |
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| 80 | // bind the mousedown event, which starts drag interactions |
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| 81 | $event.add( this, "touchstart mousedown", drag.init, data ); |
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| 82 | // prevent image dragging in IE... |
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| 83 | if ( this.attachEvent ) |
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| 84 | this.attachEvent("ondragstart", drag.dontstart ); |
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| 85 | }, |
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| 86 | |
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| 87 | // destroy configured interaction |
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| 88 | teardown: function(){ |
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| 89 | var data = $.data( this, drag.datakey ) || {}; |
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| 90 | // check for related events |
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| 91 | if ( data.related ) |
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| 92 | return; |
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| 93 | // remove the stored data |
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| 94 | $.removeData( this, drag.datakey ); |
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| 95 | // remove the mousedown event |
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| 96 | $event.remove( this, "touchstart mousedown", drag.init ); |
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| 97 | // enable text selection |
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| 98 | drag.textselect( true ); |
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| 99 | // un-prevent image dragging in IE... |
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| 100 | if ( this.detachEvent ) |
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| 101 | this.detachEvent("ondragstart", drag.dontstart ); |
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| 102 | }, |
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| 103 | |
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| 104 | // initialize the interaction |
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| 105 | init: function( event ){ |
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| 106 | // sorry, only one touch at a time |
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| 107 | if ( drag.touched ) |
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| 108 | return; |
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| 109 | // the drag/drop interaction data |
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| 110 | var dd = event.data, results; |
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| 111 | // check the which directive |
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| 112 | if ( event.which != 0 && dd.which > 0 && event.which != dd.which ) |
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| 113 | return; |
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| 114 | // check for suppressed selector |
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| 115 | if ( $( event.target ).is( dd.not ) ) |
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| 116 | return; |
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| 117 | // check for handle selector |
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| 118 | if ( dd.handle && !$( event.target ).closest( dd.handle, event.currentTarget ).length ) |
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| 119 | return; |
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| 120 | |
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| 121 | drag.touched = event.type == 'touchstart' ? this : null; |
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| 122 | dd.propagates = 1; |
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| 123 | dd.mousedown = this; |
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| 124 | dd.interactions = [ drag.interaction( this, dd ) ]; |
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| 125 | dd.target = event.target; |
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| 126 | dd.pageX = event.pageX; |
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| 127 | dd.pageY = event.pageY; |
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| 128 | dd.dragging = null; |
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| 129 | // handle draginit event... |
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| 130 | results = drag.hijack( event, "draginit", dd ); |
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| 131 | // early cancel |
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| 132 | if ( !dd.propagates ) |
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| 133 | return; |
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| 134 | // flatten the result set |
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| 135 | results = drag.flatten( results ); |
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| 136 | // insert new interaction elements |
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| 137 | if ( results && results.length ){ |
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| 138 | dd.interactions = []; |
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| 139 | $.each( results, function(){ |
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| 140 | dd.interactions.push( drag.interaction( this, dd ) ); |
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| 141 | }); |
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| 142 | } |
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| 143 | // remember how many interactions are propagating |
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| 144 | dd.propagates = dd.interactions.length; |
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| 145 | // locate and init the drop targets |
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| 146 | if ( dd.drop !== false && $special.drop ) |
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| 147 | $special.drop.handler( event, dd ); |
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| 148 | // disable text selection |
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| 149 | drag.textselect( false ); |
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| 150 | // bind additional events... |
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| 151 | if ( drag.touched ) |
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| 152 | $event.add( drag.touched, "touchmove touchend", drag.handler, dd ); |
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| 153 | else |
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| 154 | $event.add( document, "mousemove mouseup", drag.handler, dd ); |
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| 155 | // helps prevent text selection or scrolling |
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| 156 | if ( !drag.touched || dd.live ) |
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| 157 | return false; |
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| 158 | }, |
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| 159 | |
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| 160 | // returns an interaction object |
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| 161 | interaction: function( elem, dd ){ |
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| 162 | var offset = $( elem )[ dd.relative ? "position" : "offset" ]() || { top:0, left:0 }; |
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| 163 | return { |
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| 164 | drag: elem, |
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| 165 | callback: new drag.callback(), |
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| 166 | droppable: [], |
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| 167 | offset: offset |
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| 168 | }; |
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| 169 | }, |
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| 170 | |
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| 171 | // handle drag-releatd DOM events |
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| 172 | handler: function( event ){ |
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| 173 | // read the data before hijacking anything |
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| 174 | var dd = event.data; |
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| 175 | // handle various events |
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| 176 | switch ( event.type ){ |
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| 177 | // mousemove, check distance, start dragging |
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| 178 | case !dd.dragging && 'touchmove': |
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| 179 | event.preventDefault(); |
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| 180 | case !dd.dragging && 'mousemove': |
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| 181 | // drag tolerance, x² + y² = distance² |
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| 182 | if ( Math.pow( event.pageX-dd.pageX, 2 ) + Math.pow( event.pageY-dd.pageY, 2 ) < Math.pow( dd.distance, 2 ) ) |
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| 183 | break; // distance tolerance not reached |
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| 184 | event.target = dd.target; // force target from "mousedown" event (fix distance issue) |
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| 185 | drag.hijack( event, "dragstart", dd ); // trigger "dragstart" |
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| 186 | if ( dd.propagates ) // "dragstart" not rejected |
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| 187 | dd.dragging = true; // activate interaction |
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| 188 | // mousemove, dragging |
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| 189 | case 'touchmove': |
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| 190 | event.preventDefault(); |
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| 191 | case 'mousemove': |
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| 192 | if ( dd.dragging ){ |
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| 193 | // trigger "drag" |
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| 194 | drag.hijack( event, "drag", dd ); |
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| 195 | if ( dd.propagates ){ |
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| 196 | // manage drop events |
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| 197 | if ( dd.drop !== false && $special.drop ) |
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| 198 | $special.drop.handler( event, dd ); // "dropstart", "dropend" |
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| 199 | break; // "drag" not rejected, stop |
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| 200 | } |
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| 201 | event.type = "mouseup"; // helps "drop" handler behave |
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| 202 | } |
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| 203 | // mouseup, stop dragging |
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| 204 | case 'touchend': |
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| 205 | case 'mouseup': |
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| 206 | default: |
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| 207 | if ( drag.touched ) |
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| 208 | $event.remove( drag.touched, "touchmove touchend", drag.handler ); // remove touch events |
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| 209 | else |
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| 210 | $event.remove( document, "mousemove mouseup", drag.handler ); // remove page events |
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| 211 | if ( dd.dragging ){ |
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| 212 | if ( dd.drop !== false && $special.drop ) |
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| 213 | $special.drop.handler( event, dd ); // "drop" |
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| 214 | drag.hijack( event, "dragend", dd ); // trigger "dragend" |
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| 215 | } |
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| 216 | drag.textselect( true ); // enable text selection |
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| 217 | // if suppressing click events... |
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| 218 | if ( dd.click === false && dd.dragging ) |
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| 219 | $.data( dd.mousedown, "suppress.click", new Date().getTime() + 5 ); |
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| 220 | dd.dragging = drag.touched = false; // deactivate element |
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| 221 | break; |
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| 222 | } |
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| 223 | }, |
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| 224 | |
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| 225 | // re-use event object for custom events |
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| 226 | hijack: function( event, type, dd, x, elem ){ |
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| 227 | // not configured |
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| 228 | if ( !dd ) |
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| 229 | return; |
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| 230 | // remember the original event and type |
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| 231 | var orig = { event:event.originalEvent, type:event.type }, |
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| 232 | // is the event drag related or drog related? |
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| 233 | mode = type.indexOf("drop") ? "drag" : "drop", |
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| 234 | // iteration vars |
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| 235 | result, i = x || 0, ia, $elems, callback, |
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| 236 | len = !isNaN( x ) ? x : dd.interactions.length; |
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| 237 | // modify the event type |
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| 238 | event.type = type; |
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| 239 | // remove the original event |
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| 240 | event.originalEvent = null; |
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| 241 | // initialize the results |
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| 242 | dd.results = []; |
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| 243 | // handle each interacted element |
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| 244 | do if ( ia = dd.interactions[ i ] ){ |
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| 245 | // validate the interaction |
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| 246 | if ( type !== "dragend" && ia.cancelled ) |
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| 247 | continue; |
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| 248 | // set the dragdrop properties on the event object |
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| 249 | callback = drag.properties( event, dd, ia ); |
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| 250 | // prepare for more results |
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| 251 | ia.results = []; |
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| 252 | // handle each element |
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| 253 | $( elem || ia[ mode ] || dd.droppable ).each(function( p, subject ){ |
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| 254 | // identify drag or drop targets individually |
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| 255 | callback.target = subject; |
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| 256 | // force propagtion of the custom event |
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| 257 | event.isPropagationStopped = function(){ return false; }; |
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| 258 | // handle the event |
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| 259 | result = subject ? $event.dispatch.call( subject, event, callback ) : null; |
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| 260 | // stop the drag interaction for this element |
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| 261 | if ( result === false ){ |
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| 262 | if ( mode == "drag" ){ |
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| 263 | ia.cancelled = true; |
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| 264 | dd.propagates -= 1; |
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| 265 | } |
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| 266 | if ( type == "drop" ){ |
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| 267 | ia[ mode ][p] = null; |
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| 268 | } |
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| 269 | } |
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| 270 | // assign any dropinit elements |
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| 271 | else if ( type == "dropinit" ) |
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| 272 | ia.droppable.push( drag.element( result ) || subject ); |
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| 273 | // accept a returned proxy element |
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| 274 | if ( type == "dragstart" ) |
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| 275 | ia.proxy = $( drag.element( result ) || ia.drag )[0]; |
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| 276 | // remember this result |
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| 277 | ia.results.push( result ); |
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| 278 | // forget the event result, for recycling |
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| 279 | delete event.result; |
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| 280 | // break on cancelled handler |
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| 281 | if ( type !== "dropinit" ) |
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| 282 | return result; |
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| 283 | }); |
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| 284 | // flatten the results |
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| 285 | dd.results[ i ] = drag.flatten( ia.results ); |
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| 286 | // accept a set of valid drop targets |
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| 287 | if ( type == "dropinit" ) |
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| 288 | ia.droppable = drag.flatten( ia.droppable ); |
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| 289 | // locate drop targets |
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| 290 | if ( type == "dragstart" && !ia.cancelled ) |
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| 291 | callback.update(); |
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| 292 | } |
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| 293 | while ( ++i < len ) |
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| 294 | // restore the original event & type |
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| 295 | event.type = orig.type; |
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| 296 | event.originalEvent = orig.event; |
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| 297 | // return all handler results |
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| 298 | return drag.flatten( dd.results ); |
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| 299 | }, |
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| 300 | |
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| 301 | // extend the callback object with drag/drop properties... |
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| 302 | properties: function( event, dd, ia ){ |
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| 303 | var obj = ia.callback; |
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| 304 | // elements |
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| 305 | obj.drag = ia.drag; |
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| 306 | obj.proxy = ia.proxy || ia.drag; |
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| 307 | // starting mouse position |
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| 308 | obj.startX = dd.pageX; |
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| 309 | obj.startY = dd.pageY; |
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| 310 | // current distance dragged |
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| 311 | obj.deltaX = event.pageX - dd.pageX; |
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| 312 | obj.deltaY = event.pageY - dd.pageY; |
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| 313 | // original element position |
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| 314 | obj.originalX = ia.offset.left; |
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| 315 | obj.originalY = ia.offset.top; |
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| 316 | // adjusted element position |
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| 317 | obj.offsetX = obj.originalX + obj.deltaX; |
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| 318 | obj.offsetY = obj.originalY + obj.deltaY; |
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| 319 | // assign the drop targets information |
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| 320 | obj.drop = drag.flatten( ( ia.drop || [] ).slice() ); |
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| 321 | obj.available = drag.flatten( ( ia.droppable || [] ).slice() ); |
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| 322 | return obj; |
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| 323 | }, |
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| 324 | |
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| 325 | // determine is the argument is an element or jquery instance |
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| 326 | element: function( arg ){ |
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| 327 | if ( arg && ( arg.jquery || arg.nodeType == 1 ) ) |
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| 328 | return arg; |
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| 329 | }, |
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| 330 | |
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| 331 | // flatten nested jquery objects and arrays into a single dimension array |
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| 332 | flatten: function( arr ){ |
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| 333 | return $.map( arr, function( member ){ |
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| 334 | return member && member.jquery ? $.makeArray( member ) : |
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| 335 | member && member.length ? drag.flatten( member ) : member; |
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| 336 | }); |
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| 337 | }, |
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| 338 | |
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| 339 | // toggles text selection attributes ON (true) or OFF (false) |
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| 340 | textselect: function( bool ){ |
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| 341 | $( document )[ bool ? "unbind" : "bind" ]("selectstart", drag.dontstart ) |
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| 342 | .css("MozUserSelect", bool ? "" : "none" ); |
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| 343 | // .attr("unselectable", bool ? "off" : "on" ) |
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| 344 | document.unselectable = bool ? "off" : "on"; |
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| 345 | }, |
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| 346 | |
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| 347 | // suppress "selectstart" and "ondragstart" events |
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| 348 | dontstart: function(){ |
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| 349 | return false; |
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| 350 | }, |
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| 351 | |
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| 352 | // a callback instance contructor |
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| 353 | callback: function(){} |
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| 354 | |
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| 355 | }; |
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| 356 | |
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| 357 | // callback methods |
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| 358 | drag.callback.prototype = { |
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| 359 | update: function(){ |
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| 360 | if ( $special.drop && this.available.length ) |
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| 361 | $.each( this.available, function( i ){ |
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| 362 | $special.drop.locate( this, i ); |
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| 363 | }); |
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| 364 | } |
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| 365 | }; |
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| 366 | |
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| 367 | // patch $.event.$dispatch to allow suppressing clicks |
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| 368 | var $dispatch = $event.dispatch; |
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| 369 | $event.dispatch = function( event ){ |
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| 370 | if ( $.data( this, "suppress."+ event.type ) - new Date().getTime() > 0 ){ |
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| 371 | $.removeData( this, "suppress."+ event.type ); |
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| 372 | return; |
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| 373 | } |
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| 374 | return $dispatch.apply( this, arguments ); |
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| 375 | }; |
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| 376 | |
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| 377 | // event fix hooks for touch events... |
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| 378 | var touchHooks = |
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| 379 | $event.fixHooks.touchstart = |
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| 380 | $event.fixHooks.touchmove = |
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| 381 | $event.fixHooks.touchend = |
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| 382 | $event.fixHooks.touchcancel = { |
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| 383 | props: "clientX clientY pageX pageY screenX screenY".split( " " ), |
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| 384 | filter: function( event, orig ) { |
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| 385 | if ( orig ){ |
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| 386 | var touched = ( orig.touches && orig.touches[0] ) |
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| 387 | || ( orig.changedTouches && orig.changedTouches[0] ) |
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| 388 | || null; |
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| 389 | // iOS webkit: touchstart, touchmove, touchend |
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| 390 | if ( touched ) |
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| 391 | $.each( touchHooks.props, function( i, prop ){ |
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| 392 | event[ prop ] = touched[ prop ]; |
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| 393 | }); |
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| 394 | } |
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| 395 | return event; |
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| 396 | } |
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| 397 | }; |
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| 398 | |
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| 399 | // share the same special event configuration with related events... |
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| 400 | $special.draginit = $special.dragstart = $special.dragend = drag; |
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| 401 | |
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| 402 | })( jQuery ); |
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