116 lines
3.6 KiB
JavaScript
116 lines
3.6 KiB
JavaScript
/*
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Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
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Available via Academic Free License >= 2.1 OR the modified BSD license.
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see: http://dojotoolkit.org/license for details
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*/
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if(!dojo._hasResource["dojo.dnd.autoscroll"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
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dojo._hasResource["dojo.dnd.autoscroll"] = true;
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dojo.provide("dojo.dnd.autoscroll");
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dojo.dnd.getViewport = function(){
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// summary:
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// Returns a viewport size (visible part of the window)
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// TODO: remove this when getViewport() moved to dojo core, see #7028
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// FIXME: need more docs!!
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var d = dojo.doc, dd = d.documentElement, w = window, b = dojo.body();
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if(dojo.isMozilla){
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return {w: dd.clientWidth, h: w.innerHeight}; // Object
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}else if(!dojo.isOpera && w.innerWidth){
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return {w: w.innerWidth, h: w.innerHeight}; // Object
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}else if (!dojo.isOpera && dd && dd.clientWidth){
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return {w: dd.clientWidth, h: dd.clientHeight}; // Object
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}else if (b.clientWidth){
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return {w: b.clientWidth, h: b.clientHeight}; // Object
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}
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return null; // Object
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};
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dojo.dnd.V_TRIGGER_AUTOSCROLL = 32;
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dojo.dnd.H_TRIGGER_AUTOSCROLL = 32;
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dojo.dnd.V_AUTOSCROLL_VALUE = 16;
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dojo.dnd.H_AUTOSCROLL_VALUE = 16;
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dojo.dnd.autoScroll = function(e){
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// summary:
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// a handler for onmousemove event, which scrolls the window, if
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// necesary
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// e: Event
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// onmousemove event
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// FIXME: needs more docs!
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var v = dojo.dnd.getViewport(), dx = 0, dy = 0;
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if(e.clientX < dojo.dnd.H_TRIGGER_AUTOSCROLL){
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dx = -dojo.dnd.H_AUTOSCROLL_VALUE;
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}else if(e.clientX > v.w - dojo.dnd.H_TRIGGER_AUTOSCROLL){
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dx = dojo.dnd.H_AUTOSCROLL_VALUE;
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}
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if(e.clientY < dojo.dnd.V_TRIGGER_AUTOSCROLL){
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dy = -dojo.dnd.V_AUTOSCROLL_VALUE;
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}else if(e.clientY > v.h - dojo.dnd.V_TRIGGER_AUTOSCROLL){
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dy = dojo.dnd.V_AUTOSCROLL_VALUE;
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}
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window.scrollBy(dx, dy);
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};
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dojo.dnd._validNodes = {"div": 1, "p": 1, "td": 1};
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dojo.dnd._validOverflow = {"auto": 1, "scroll": 1};
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dojo.dnd.autoScrollNodes = function(e){
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// summary:
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// a handler for onmousemove event, which scrolls the first avaialble
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// Dom element, it falls back to dojo.dnd.autoScroll()
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// e: Event
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// onmousemove event
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// FIXME: needs more docs!
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for(var n = e.target; n;){
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if(n.nodeType == 1 && (n.tagName.toLowerCase() in dojo.dnd._validNodes)){
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var s = dojo.getComputedStyle(n);
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if(s.overflow.toLowerCase() in dojo.dnd._validOverflow){
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var b = dojo._getContentBox(n, s), t = dojo.position(n, true);
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//console.log(b.l, b.t, t.x, t.y, n.scrollLeft, n.scrollTop);
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var w = Math.min(dojo.dnd.H_TRIGGER_AUTOSCROLL, b.w / 2),
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h = Math.min(dojo.dnd.V_TRIGGER_AUTOSCROLL, b.h / 2),
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rx = e.pageX - t.x, ry = e.pageY - t.y, dx = 0, dy = 0;
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if(dojo.isWebKit || dojo.isOpera){
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// FIXME: this code should not be here, it should be taken into account
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// either by the event fixing code, or the dojo.position()
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// FIXME: this code doesn't work on Opera 9.5 Beta
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rx += dojo.body().scrollLeft, ry += dojo.body().scrollTop;
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}
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if(rx > 0 && rx < b.w){
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if(rx < w){
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dx = -w;
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}else if(rx > b.w - w){
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dx = w;
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}
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}
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//console.log("ry =", ry, "b.h =", b.h, "h =", h);
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if(ry > 0 && ry < b.h){
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if(ry < h){
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dy = -h;
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}else if(ry > b.h - h){
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dy = h;
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}
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}
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var oldLeft = n.scrollLeft, oldTop = n.scrollTop;
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n.scrollLeft = n.scrollLeft + dx;
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n.scrollTop = n.scrollTop + dy;
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if(oldLeft != n.scrollLeft || oldTop != n.scrollTop){ return; }
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}
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}
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try{
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n = n.parentNode;
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}catch(x){
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n = null;
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}
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}
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dojo.dnd.autoScroll(e);
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};
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}
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