mirror of
https://github.com/jquery/jquery-ui.git
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152 lines
3.9 KiB
JavaScript
152 lines
3.9 KiB
JavaScript
/*
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* jQuery UI Droppable @VERSION
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*
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* Copyright 2011, AUTHORS.txt (http://jqueryui.com/about)
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* Dual licensed under the MIT or GPL Version 2 licenses.
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* http://jquery.org/license
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*
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* http://docs.jquery.com/UI/Droppable
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*
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* Depends:
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* jquery.ui.core.js
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* jquery.ui.widget.js
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* jquery.ui.draggable.js
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*/
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(function( $, undefined ) {
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var guid = 0,
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droppables = {};
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(function() {
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var orig = $.ui.draggable.prototype._trigger;
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$.ui.draggable.prototype._trigger = function( type, event, ui ) {
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var droppable,
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method = "_draggable" + type.substr( 0, 1 ).toUpperCase() + type.substr( 1 );
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for ( droppable in droppables ) {
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droppables[ droppable ][ method ].call( droppables[ droppable ], event, ui );
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}
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orig.apply( this, arguments );
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};
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})();
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$.widget( "ui.droppable", {
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version: "@VERSION",
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widgetEventPrefix: "drop",
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options: {
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// accept: null,
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// greedy: false,
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tolerance: "intersect"
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},
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// draggableProportions: width and height of currently dragging draggable
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// over: whether or not a draggable is currently over droppable
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// proportions: width and height of droppable
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_create: function() {
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this.refreshPosition();
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this.guid = guid++;
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droppables[ this.guid ] = this;
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},
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/** public **/
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// TODO: rename to refresh()?
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refreshPosition: function() {
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// Store current location
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this.offset = this.element.offset();
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// Store the droppable's proportions
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// TODO: should this delegate to core?
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this.proportions = {
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width: this.element[0].offsetWidth,
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height: this.element[0].offsetHeight
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};
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},
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/** draggable integration **/
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_draggableStart: function( event, ui ) {
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var draggable = $( event.target );
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// TODO: Possibly move into draggable hash
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// so if there are multiple droppables, it's not recalculating all the time
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// TODO: Should this use the helper if it exists?
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this.draggableProportions = {
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width: draggable[0].offsetWidth,
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height: draggable[0].offsetHeight
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};
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},
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_draggableDrag: function( event, ui ) {
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var edges = {
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right: this.offset.left + this.proportions.width,
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bottom: this.offset.top + this.proportions.height,
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draggableRight: ui.offset.left + this.draggableProportions.width,
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draggableBottom: ui.offset.top + this.draggableProportions.height
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},
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over = $.ui.droppable.tolerance[ this.options.tolerance ]
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.call( this, event, edges, ui );
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// If there is sufficient overlap as deemed by tolerance
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if ( over ) {
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this._trigger( "over", event, this._uiHash() );
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this.over = true;
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// If there isn't enough overlap and droppable was previously flagged as over
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} else if ( this.over ) {
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this.over = false;
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this._trigger( "out", event, this._uiHash() );
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}
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},
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_draggableStop: function( event, ui ) {
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if ( this.over ) {
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this._trigger( "drop", event, this._uiHash() );
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}
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this.over = false;
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},
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/** internal **/
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// TODO: fill me out
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_uiHash: function() {
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return {};
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},
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_destroy: function() {
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delete droppables[ this.guid ];
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}
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});
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$.ui.droppable.tolerance = {
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// Half of the draggable overlaps the droppable, horizontally and vertically
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intersect: function( event, edges, ui ) {
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var xHalf = ui.offset.left + this.draggableProportions.width / 2,
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yHalf = ui.offset.top + this.draggableProportions.height / 2;
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return this.offset.left < xHalf && edges.right > xHalf &&
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this.offset.top < yHalf && edges.bottom > yHalf;
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},
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// Draggable overlaps droppable by at least one pixel
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touch: function( event, edges, ui ) {
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return this.offset.left < edges.draggableRight &&
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edges.right > ui.offset.left &&
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this.offset.top < edges.draggableBottom &&
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edges.bottom > ui.offset.top;
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},
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// Pointer overlaps droppable
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pointer: function( event, edges, ui ) {
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var xOverlap = event.pageX >= this.offset.left &&
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event.pageX <= edges.right,
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yOverlap = event.pageY >= this.offset.top &&
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event.pageY <= edges.bottom;
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return xOverlap && yOverlap;
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}
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};
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})( jQuery );
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