ScrollManager.js
资源名称:ext-3.0.0.zip [点击查看]
上传用户:shuoshiled
上传日期:2018-01-28
资源大小:10124k
文件大小:6k
源码类别:
中间件编程
开发平台:
JavaScript
- /*! * Ext JS Library 3.0.0 * Copyright(c) 2006-2009 Ext JS, LLC * licensing@extjs.com * http://www.extjs.com/license */ /**
- * @class Ext.dd.ScrollManager
- * <p>Provides automatic scrolling of overflow regions in the page during drag operations.</p>
- * <p>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
- * <tt>ddScrollConfig</tt> object to the target element that contains these properties: {@link #hthresh},
- * {@link #vthresh}, {@link #increment} and {@link #frequency}. Example usage:
- * <pre><code>
- var el = Ext.get('scroll-ct');
- el.ddScrollConfig = {
- vthresh: 50,
- hthresh: -1,
- frequency: 100,
- increment: 200
- };
- Ext.dd.ScrollManager.register(el);
- </code></pre>
- * <b>Note: This class uses "Point Mode" and is untested in "Intersect Mode".</b>
- * @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 freq = (el.ddScrollConfig && el.ddScrollConfig.frequency) ?
- el.ddScrollConfig.frequency : Ext.dd.ScrollManager.frequency;
- 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 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: .4,
- /**
- * 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();
- }
- }
- }
- };
- }();