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-rw-r--r--includes/js/dojo/dnd/autoscroll.js103
1 files changed, 103 insertions, 0 deletions
diff --git a/includes/js/dojo/dnd/autoscroll.js b/includes/js/dojo/dnd/autoscroll.js
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+++ b/includes/js/dojo/dnd/autoscroll.js
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+if(!dojo._hasResource["dojo.dnd.autoscroll"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
+dojo._hasResource["dojo.dnd.autoscroll"] = true;
+dojo.provide("dojo.dnd.autoscroll");
+
+dojo.dnd.getViewport = function(){
+ // summary: returns a viewport size (visible part of the window)
+
+ // FIXME: need more docs!!
+ var d = dojo.doc, dd = d.documentElement, w = window, b = dojo.body();
+ if(dojo.isMozilla){
+ return {w: dd.clientWidth, h: w.innerHeight}; // Object
+ }else if(!dojo.isOpera && w.innerWidth){
+ return {w: w.innerWidth, h: w.innerHeight}; // Object
+ }else if (!dojo.isOpera && dd && dd.clientWidth){
+ return {w: dd.clientWidth, h: dd.clientHeight}; // Object
+ }else if (b.clientWidth){
+ return {w: b.clientWidth, h: b.clientHeight}; // Object
+ }
+ return null; // Object
+};
+
+dojo.dnd.V_TRIGGER_AUTOSCROLL = 32;
+dojo.dnd.H_TRIGGER_AUTOSCROLL = 32;
+
+dojo.dnd.V_AUTOSCROLL_VALUE = 16;
+dojo.dnd.H_AUTOSCROLL_VALUE = 16;
+
+dojo.dnd.autoScroll = function(e){
+ // summary:
+ // a handler for onmousemove event, which scrolls the window, if
+ // necesary
+ // e: Event:
+ // onmousemove event
+
+ // FIXME: needs more docs!
+ var v = dojo.dnd.getViewport(), dx = 0, dy = 0;
+ if(e.clientX < dojo.dnd.H_TRIGGER_AUTOSCROLL){
+ dx = -dojo.dnd.H_AUTOSCROLL_VALUE;
+ }else if(e.clientX > v.w - dojo.dnd.H_TRIGGER_AUTOSCROLL){
+ dx = dojo.dnd.H_AUTOSCROLL_VALUE;
+ }
+ if(e.clientY < dojo.dnd.V_TRIGGER_AUTOSCROLL){
+ dy = -dojo.dnd.V_AUTOSCROLL_VALUE;
+ }else if(e.clientY > v.h - dojo.dnd.V_TRIGGER_AUTOSCROLL){
+ dy = dojo.dnd.V_AUTOSCROLL_VALUE;
+ }
+ window.scrollBy(dx, dy);
+};
+
+dojo.dnd._validNodes = {"div": 1, "p": 1, "td": 1};
+dojo.dnd._validOverflow = {"auto": 1, "scroll": 1};
+
+dojo.dnd.autoScrollNodes = function(e){
+ // summary:
+ // a handler for onmousemove event, which scrolls the first avaialble
+ // Dom element, it falls back to dojo.dnd.autoScroll()
+ // e: Event:
+ // onmousemove event
+
+ // FIXME: needs more docs!
+ for(var n = e.target; n;){
+ if(n.nodeType == 1 && (n.tagName.toLowerCase() in dojo.dnd._validNodes)){
+ var s = dojo.getComputedStyle(n);
+ if(s.overflow.toLowerCase() in dojo.dnd._validOverflow){
+ var b = dojo._getContentBox(n, s), t = dojo._abs(n, true);
+ // console.debug(b.l, b.t, t.x, t.y, n.scrollLeft, n.scrollTop);
+ b.l += t.x + n.scrollLeft;
+ b.t += t.y + n.scrollTop;
+ var w = Math.min(dojo.dnd.H_TRIGGER_AUTOSCROLL, b.w / 2),
+ h = Math.min(dojo.dnd.V_TRIGGER_AUTOSCROLL, b.h / 2),
+ rx = e.pageX - b.l, ry = e.pageY - b.t, dx = 0, dy = 0;
+ if(rx > 0 && rx < b.w){
+ if(rx < w){
+ dx = -dojo.dnd.H_AUTOSCROLL_VALUE;
+ }else if(rx > b.w - w){
+ dx = dojo.dnd.H_AUTOSCROLL_VALUE;
+ }
+ }
+ //console.debug("ry =", ry, "b.h =", b.h, "h =", h);
+ if(ry > 0 && ry < b.h){
+ if(ry < h){
+ dy = -dojo.dnd.V_AUTOSCROLL_VALUE;
+ }else if(ry > b.h - h){
+ dy = dojo.dnd.V_AUTOSCROLL_VALUE;
+ }
+ }
+ var oldLeft = n.scrollLeft, oldTop = n.scrollTop;
+ n.scrollLeft = n.scrollLeft + dx;
+ n.scrollTop = n.scrollTop + dy;
+ // if(dx || dy){ console.debug(oldLeft + ", " + oldTop + "\n" + dx + ", " + dy + "\n" + n.scrollLeft + ", " + n.scrollTop); }
+ if(oldLeft != n.scrollLeft || oldTop != n.scrollTop){ return; }
+ }
+ }
+ try{
+ n = n.parentNode;
+ }catch(x){
+ n = null;
+ }
+ }
+ dojo.dnd.autoScroll(e);
+};
+
+}