git.pond.sub.org Git - eow/blob - static/dojo-release-1.1.1/dojo/dnd/autoscroll.js

   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");
   4
   5 dojo.dnd.getViewport = function(){
   6         // summary: returns a viewport size (visible part of the window)
   7
   8         // FIXME: need more docs!!
   9         var d = dojo.doc, dd = d.documentElement, w = window, b = dojo.body();
  10         if(dojo.isMozilla){
  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
  18         }
  19         return null;    // Object
  20 };
  21
  22 dojo.dnd.V_TRIGGER_AUTOSCROLL = 32;
  23 dojo.dnd.H_TRIGGER_AUTOSCROLL = 32;
  24
  25 dojo.dnd.V_AUTOSCROLL_VALUE = 16;
  26 dojo.dnd.H_AUTOSCROLL_VALUE = 16;
  27
  28 dojo.dnd.autoScroll = function(e){
  29         // summary:
  30         //              a handler for onmousemove event, which scrolls the window, if
  31         //              necesary
  32         // e: Event:
  33         //              onmousemove event
  34
  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;
  41         }
  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;
  46         }
  47         window.scrollBy(dx, dy);
  48 };
  49
  50 dojo.dnd._validNodes = {"div": 1, "p": 1, "td": 1};
  51 dojo.dnd._validOverflow = {"auto": 1, "scroll": 1};
  52
  53 dojo.dnd.autoScrollNodes = function(e){
  54         // summary:
  55         //              a handler for onmousemove event, which scrolls the first avaialble
  56         //              Dom element, it falls back to dojo.dnd.autoScroll()
  57         // e: Event:
  58         //              onmousemove event
  59
  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){
  73                                         if(rx < w){
  74                                                 dx = -dojo.dnd.H_AUTOSCROLL_VALUE;
  75                                         }else if(rx > b.w - w){
  76                                                 dx = dojo.dnd.H_AUTOSCROLL_VALUE;
  77                                         }
  78                                 }
  79                                 //console.debug("ry =", ry, "b.h =", b.h, "h =", h);
  80                                 if(ry > 0 && ry < b.h){
  81                                         if(ry < h){
  82                                                 dy = -dojo.dnd.V_AUTOSCROLL_VALUE;
  83                                         }else if(ry > b.h - h){
  84                                                 dy = dojo.dnd.V_AUTOSCROLL_VALUE;
  85                                         }
  86                                 }
  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; }
  92                         }
  93                 }
  94                 try{
  95                         n = n.parentNode;
  96                 }catch(x){
  97                         n = null;
  98                 }
  99         }
 100         dojo.dnd.autoScroll(e);
 101 };
 102
 103 }