1 if(!dojo._hasResource["dojo.dnd.autoscroll"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
2 dojo._hasResource["dojo.dnd.autoscroll"] = true;
3 dojo.provide("dojo.dnd.autoscroll");
5 dojo.dnd.getViewport = function(){
6 // summary: returns a viewport size (visible part of the window)
8 // FIXME: need more docs!!
9 var d = dojo.doc, dd = d.documentElement, w = window, b = dojo.body();
11 return {w: dd.clientWidth, h: w.innerHeight}; // Object
12 }else if(!dojo.isOpera && w.innerWidth){
13 return {w: w.innerWidth, h: w.innerHeight}; // Object
14 }else if (!dojo.isOpera && dd && dd.clientWidth){
15 return {w: dd.clientWidth, h: dd.clientHeight}; // Object
16 }else if (b.clientWidth){
17 return {w: b.clientWidth, h: b.clientHeight}; // Object
19 return null; // Object
22 dojo.dnd.V_TRIGGER_AUTOSCROLL = 32;
23 dojo.dnd.H_TRIGGER_AUTOSCROLL = 32;
25 dojo.dnd.V_AUTOSCROLL_VALUE = 16;
26 dojo.dnd.H_AUTOSCROLL_VALUE = 16;
28 dojo.dnd.autoScroll = function(e){
30 // a handler for onmousemove event, which scrolls the window, if
35 // FIXME: needs more docs!
36 var v = dojo.dnd.getViewport(), dx = 0, dy = 0;
37 if(e.clientX < dojo.dnd.H_TRIGGER_AUTOSCROLL){
38 dx = -dojo.dnd.H_AUTOSCROLL_VALUE;
39 }else if(e.clientX > v.w - dojo.dnd.H_TRIGGER_AUTOSCROLL){
40 dx = dojo.dnd.H_AUTOSCROLL_VALUE;
42 if(e.clientY < dojo.dnd.V_TRIGGER_AUTOSCROLL){
43 dy = -dojo.dnd.V_AUTOSCROLL_VALUE;
44 }else if(e.clientY > v.h - dojo.dnd.V_TRIGGER_AUTOSCROLL){
45 dy = dojo.dnd.V_AUTOSCROLL_VALUE;
47 window.scrollBy(dx, dy);
50 dojo.dnd._validNodes = {"div": 1, "p": 1, "td": 1};
51 dojo.dnd._validOverflow = {"auto": 1, "scroll": 1};
53 dojo.dnd.autoScrollNodes = function(e){
55 // a handler for onmousemove event, which scrolls the first avaialble
56 // Dom element, it falls back to dojo.dnd.autoScroll()
60 // FIXME: needs more docs!
61 for(var n = e.target; n;){
62 if(n.nodeType == 1 && (n.tagName.toLowerCase() in dojo.dnd._validNodes)){
63 var s = dojo.getComputedStyle(n);
64 if(s.overflow.toLowerCase() in dojo.dnd._validOverflow){
65 var b = dojo._getContentBox(n, s), t = dojo._abs(n, true);
66 // console.debug(b.l, b.t, t.x, t.y, n.scrollLeft, n.scrollTop);
67 b.l += t.x + n.scrollLeft;
68 b.t += t.y + n.scrollTop;
69 var w = Math.min(dojo.dnd.H_TRIGGER_AUTOSCROLL, b.w / 2),
70 h = Math.min(dojo.dnd.V_TRIGGER_AUTOSCROLL, b.h / 2),
71 rx = e.pageX - b.l, ry = e.pageY - b.t, dx = 0, dy = 0;
72 if(rx > 0 && rx < b.w){
74 dx = -dojo.dnd.H_AUTOSCROLL_VALUE;
75 }else if(rx > b.w - w){
76 dx = dojo.dnd.H_AUTOSCROLL_VALUE;
79 //console.debug("ry =", ry, "b.h =", b.h, "h =", h);
80 if(ry > 0 && ry < b.h){
82 dy = -dojo.dnd.V_AUTOSCROLL_VALUE;
83 }else if(ry > b.h - h){
84 dy = dojo.dnd.V_AUTOSCROLL_VALUE;
87 var oldLeft = n.scrollLeft, oldTop = n.scrollTop;
88 n.scrollLeft = n.scrollLeft + dx;
89 n.scrollTop = n.scrollTop + dy;
90 // if(dx || dy){ console.debug(oldLeft + ", " + oldTop + "\n" + dx + ", " + dy + "\n" + n.scrollLeft + ", " + n.scrollTop); }
91 if(oldLeft != n.scrollLeft || oldTop != n.scrollTop){ return; }
100 dojo.dnd.autoScroll(e);