/*!
 * Ext JS Library 3.3.1
 * Copyright(c) 2006-2010 Sencha Inc.
 * licensing@sencha.com
 * http://www.sencha.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, els = {}, dragEl = null, proc = {}, onStop = function(e) { dragEl = null; clearProc(); }, triggerRefresh = function() { if (ddm.dragCurrent) { ddm.refreshCache(ddm.dragCurrent.groups); } }, doScroll = function() { if (ddm.dragCurrent) { var dds = Ext.dd.ScrollManager, 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); } } }, clearProc = function() { if (proc.id) { clearInterval(proc.id); } proc.id = 0; proc.el = null; proc.dir = ""; }, startProc = function(el, dir) { clearProc(); proc.el = el; proc.dir = dir; var freq = (el.ddScrollConfig && el.ddScrollConfig.frequency) ? el.ddScrollConfig.frequency: Ext.dd.ScrollManager.frequency, group = el.ddScrollConfig ? el.ddScrollConfig.ddGroup: undefined; if (group === undefined || ddm.dragCurrent.ddGroup == group) { proc.id = setInterval(doScroll, freq); } }, 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), pt = new Ext.lib.Point(xy[0], xy[1]), id, el, r, c; for (id in els) { if (els.hasOwnProperty(id)) { el = els[id]; r = el._region; 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)) { var i = 0, len = el.length; for (; 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)) { var i = 0, len = el.length; for (; 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 50) * @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: 0.4,
/** * Manually trigger a cache refresh. */ refreshCache: function() { var id; for (id in els) { if (els.hasOwnProperty(id)) { if (typeof els[id] == 'object') { // for people extending the object prototype els[id]._region = els[id].getRegion(); } } } } }; }();