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9 <pre class="prettyprint lang-js">/*!
10 * Ext JS Library 3.2.0
11 * Copyright(c) 2006-2010 Ext JS, Inc.
13 * http://www.extjs.com/license
15 <div id="cls-Ext.dd.ScrollManager"></div>/**
16 * @class Ext.dd.ScrollManager
17 * <p>Provides automatic scrolling of overflow regions in the page during drag operations.</p>
18 * <p>The ScrollManager configs will be used as the defaults for any scroll container registered with it,
19 * but you can also override most of the configs per scroll container by adding a
20 * <tt>ddScrollConfig</tt> object to the target element that contains these properties: {@link #hthresh},
21 * {@link #vthresh}, {@link #increment} and {@link #frequency}. Example usage:
23 var el = Ext.get('scroll-ct');
30 Ext.dd.ScrollManager.register(el);
32 * <b>Note: This class uses "Point Mode" and is untested in "Intersect Mode".</b>
35 Ext.dd.ScrollManager = function(){
36 var ddm = Ext.dd.DragDropMgr;
41 var onStop = function(e){
46 var triggerRefresh = function(){
48 ddm.refreshCache(ddm.dragCurrent.groups);
52 var doScroll = function(){
54 var dds = Ext.dd.ScrollManager;
55 var inc = proc.el.ddScrollConfig ?
56 proc.el.ddScrollConfig.increment : dds.increment;
58 if(proc.el.scroll(proc.dir, inc)){
62 proc.el.scroll(proc.dir, inc, true, dds.animDuration, triggerRefresh);
67 var clearProc = function(){
69 clearInterval(proc.id);
76 var startProc = function(el, dir){
80 var freq = (el.ddScrollConfig && el.ddScrollConfig.frequency) ?
81 el.ddScrollConfig.frequency : Ext.dd.ScrollManager.frequency;
82 proc.id = setInterval(doScroll, freq);
85 var onFire = function(e, isDrop){
86 if(isDrop || !ddm.dragCurrent){ return; }
87 var dds = Ext.dd.ScrollManager;
88 if(!dragEl || dragEl != ddm.dragCurrent){
89 dragEl = ddm.dragCurrent;
90 // refresh regions on drag start
94 var xy = Ext.lib.Event.getXY(e);
95 var pt = new Ext.lib.Point(xy[0], xy[1]);
97 var el = els[id], r = el._region;
98 var c = el.ddScrollConfig ? el.ddScrollConfig : dds;
99 if(r && r.contains(pt) && el.isScrollable()){
100 if(r.bottom - pt.y <= c.vthresh){
102 startProc(el, "down");
105 }else if(r.right - pt.x <= c.hthresh){
107 startProc(el, "left");
110 }else if(pt.y - r.top <= c.vthresh){
115 }else if(pt.x - r.left <= c.hthresh){
117 startProc(el, "right");
126 ddm.fireEvents = ddm.fireEvents.createSequence(onFire, ddm);
127 ddm.stopDrag = ddm.stopDrag.createSequence(onStop, ddm);
130 <div id="method-Ext.dd.ScrollManager-register"></div>/**
131 * Registers new overflow element(s) to auto scroll
132 * @param {Mixed/Array} el The id of or the element to be scrolled or an array of either
134 register : function(el){
136 for(var i = 0, len = el.length; i < len; i++) {
137 this.register(el[i]);
145 <div id="method-Ext.dd.ScrollManager-unregister"></div>/**
146 * Unregisters overflow element(s) so they are no longer scrolled
147 * @param {Mixed/Array} el The id of or the element to be removed or an array of either
149 unregister : function(el){
151 for(var i = 0, len = el.length; i < len; i++) {
152 this.unregister(el[i]);
160 <div id="prop-Ext.dd.ScrollManager-vthresh"></div>/**
161 * The number of pixels from the top or bottom edge of a container the pointer needs to be to
162 * trigger scrolling (defaults to 25)
166 <div id="prop-Ext.dd.ScrollManager-hthresh"></div>/**
167 * The number of pixels from the right or left edge of a container the pointer needs to be to
168 * trigger scrolling (defaults to 25)
173 <div id="prop-Ext.dd.ScrollManager-increment"></div>/**
174 * The number of pixels to scroll in each scroll increment (defaults to 50)
179 <div id="prop-Ext.dd.ScrollManager-frequency"></div>/**
180 * The frequency of scrolls in milliseconds (defaults to 500)
185 <div id="prop-Ext.dd.ScrollManager-animate"></div>/**
186 * True to animate the scroll (defaults to true)
191 <div id="prop-Ext.dd.ScrollManager-animDuration"></div>/**
192 * The animation duration in seconds -
193 * MUST BE less than Ext.dd.ScrollManager.frequency! (defaults to .4)
198 <div id="method-Ext.dd.ScrollManager-refreshCache"></div>/**
199 * Manually trigger a cache refresh.
201 refreshCache : function(){
203 if(typeof els[id] == 'object'){ // for people extending the object prototype
204 els[id]._region = els[id].getRegion();