/*!
 * Ext JS Library 3.3.0
 * Copyright(c) 2006-2010 Ext JS, Inc.
 * licensing@extjs.com
 * http://www.extjs.com/license
 */
/** * @class Ext.dd.ScrollManager *

Provides automatic scrolling of overflow regions in the page during drag operations.

*

The ScrollManager configs will be used as the defaults for any scroll container registered with it, * but you can also override most of the configs per scroll container by adding a * ddScrollConfig object to the target element that contains these properties: {@link #hthresh}, * {@link #vthresh}, {@link #increment} and {@link #frequency}. Example usage: *


var el = Ext.get('scroll-ct');
el.ddScrollConfig = {
    vthresh: 50,
    hthresh: -1,
    frequency: 100,
    increment: 200
};
Ext.dd.ScrollManager.register(el);
* Note: This class uses "Point Mode" and is untested in "Intersect Mode". * @singleton */ Ext.dd.ScrollManager = function(){ var ddm = Ext.dd.DragDropMgr; var els = {}; var dragEl = null; var proc = {}; var onStop = function(e){ dragEl = null; clearProc(); }; var triggerRefresh = function(){ if(ddm.dragCurrent){ ddm.refreshCache(ddm.dragCurrent.groups); } }; var doScroll = function(){ if(ddm.dragCurrent){ var dds = Ext.dd.ScrollManager; var inc = proc.el.ddScrollConfig ? proc.el.ddScrollConfig.increment : dds.increment; if(!dds.animate){ if(proc.el.scroll(proc.dir, inc)){ triggerRefresh(); } }else{ proc.el.scroll(proc.dir, inc, true, dds.animDuration, triggerRefresh); } } }; var clearProc = function(){ if(proc.id){ clearInterval(proc.id); } proc.id = 0; proc.el = null; proc.dir = ""; }; var startProc = function(el, dir){ clearProc(); proc.el = el; proc.dir = dir; var group = el.ddScrollConfig ? el.ddScrollConfig.ddGroup : undefined, freq = (el.ddScrollConfig && el.ddScrollConfig.frequency) ? el.ddScrollConfig.frequency : Ext.dd.ScrollManager.frequency; if (group === undefined || ddm.dragCurrent.ddGroup == group) { proc.id = setInterval(doScroll, freq); } }; var onFire = function(e, isDrop){ if(isDrop || !ddm.dragCurrent){ return; } var dds = Ext.dd.ScrollManager; if(!dragEl || dragEl != ddm.dragCurrent){ dragEl = ddm.dragCurrent; // refresh regions on drag start dds.refreshCache(); } var xy = Ext.lib.Event.getXY(e); var pt = new Ext.lib.Point(xy[0], xy[1]); for(var id in els){ var el = els[id], r = el._region; var c = el.ddScrollConfig ? el.ddScrollConfig : dds; if(r && r.contains(pt) && el.isScrollable()){ if(r.bottom - pt.y <= c.vthresh){ if(proc.el != el){ startProc(el, "down"); } return; }else if(r.right - pt.x <= c.hthresh){ if(proc.el != el){ startProc(el, "left"); } return; }else if(pt.y - r.top <= c.vthresh){ if(proc.el != el){ startProc(el, "up"); } return; }else if(pt.x - r.left <= c.hthresh){ if(proc.el != el){ startProc(el, "right"); } return; } } } clearProc(); }; ddm.fireEvents = ddm.fireEvents.createSequence(onFire, ddm); ddm.stopDrag = ddm.stopDrag.createSequence(onStop, ddm); return {
/** * Registers new overflow element(s) to auto scroll * @param {Mixed/Array} el The id of or the element to be scrolled or an array of either */ register : function(el){ if(Ext.isArray(el)){ for(var i = 0, len = el.length; i < len; i++) { this.register(el[i]); } }else{ el = Ext.get(el); els[el.id] = el; } },
/** * Unregisters overflow element(s) so they are no longer scrolled * @param {Mixed/Array} el The id of or the element to be removed or an array of either */ unregister : function(el){ if(Ext.isArray(el)){ for(var i = 0, len = el.length; i < len; i++) { this.unregister(el[i]); } }else{ el = Ext.get(el); delete els[el.id]; } },
/** * The number of pixels from the top or bottom edge of a container the pointer needs to be to * trigger scrolling (defaults to 25) * @type Number */ vthresh : 25,
/** * The number of pixels from the right or left edge of a container the pointer needs to be to * trigger scrolling (defaults to 25) * @type Number */ hthresh : 25,
/** * The number of pixels to scroll in each scroll increment (defaults to 100) * @type Number */ increment : 100,
/** * The frequency of scrolls in milliseconds (defaults to 500) * @type Number */ frequency : 500,
/** * True to animate the scroll (defaults to true) * @type Boolean */ animate: true,
/** * The animation duration in seconds - * MUST BE less than Ext.dd.ScrollManager.frequency! (defaults to .4) * @type Number */ animDuration: .4,
/** * The named drag drop {@link Ext.dd.DragSource#ddGroup group} to which this container belongs (defaults to undefined). * If a ddGroup is specified, then container scrolling will only occur when a dragged object is in the same ddGroup. * @type String */ ddGroup: undefined,
/** * Manually trigger a cache refresh. */ refreshCache : function(){ for(var id in els){ if(typeof els[id] == 'object'){ // for people extending the object prototype els[id]._region = els[id].getRegion(); } } } }; }();