/** + * @class Ext.dd.ScrollManager + *+ + \ No newline at end of fileProvides 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: + *
+ * 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 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(); + } + } + } + }; +}();+var el = Ext.get('scroll-ct'); +el.ddScrollConfig = { + vthresh: 50, + hthresh: -1, + frequency: 100, + increment: 200 +}; +Ext.dd.ScrollManager.register(el); +