1 files changed, 149 insertions, 0 deletions
diff --git a/lib/dojo/dnd/autoscroll.js.uncompressed.js b/lib/dojo/dnd/autoscroll.js.uncompressed.js
new file mode 100644
index 000000000..29fd413f5
--- /dev/null
+++ b/lib/dojo/dnd/autoscroll.js.uncompressed.js
@@ -0,0 +1,149 @@
+define("dojo/dnd/autoscroll", ["../_base/lang", "../sniff", "../_base/window", "../dom-geometry", "../dom-style", "../window"],
+	function(lang, has, win, domGeom, domStyle, winUtils){
+
+// module:
+//		dojo/dnd/autoscroll
+
+var exports = {
+	// summary:
+	//		Used by dojo/dnd/Manager to scroll document or internal node when the user
+	//		drags near the edge of the viewport or a scrollable node
+};
+lang.setObject("dojo.dnd.autoscroll", exports);
+
+exports.getViewport = winUtils.getBox;
+
+exports.V_TRIGGER_AUTOSCROLL = 32;
+exports.H_TRIGGER_AUTOSCROLL = 32;
+
+exports.V_AUTOSCROLL_VALUE = 16;
+exports.H_AUTOSCROLL_VALUE = 16;
+
+// These are set by autoScrollStart().
+// Set to default values in case autoScrollStart() isn't called. (back-compat, remove for 2.0)
+var viewport,
+	doc = win.doc,
+	maxScrollTop = Infinity,
+	maxScrollLeft = Infinity;
+
+exports.autoScrollStart = function(d){
+	// summary:
+	//		Called at the start of a drag.
+	// d: Document
+	//		The document of the node being dragged.
+
+	doc = d;
+	viewport = winUtils.getBox(doc);
+
+	// Save height/width of document at start of drag, before it gets distorted by a user dragging an avatar past
+	// the document's edge
+	var html = win.body(doc).parentNode;
+	maxScrollTop = Math.max(html.scrollHeight - viewport.h, 0);
+	maxScrollLeft = Math.max(html.scrollWidth - viewport.w, 0);	// usually 0
+};
+
+exports.autoScroll = function(e){
+	// summary:
+	//		a handler for mousemove and touchmove events, which scrolls the window, if
+	//		necessary
+	// e: Event
+	//		mousemove/touchmove event
+
+	// FIXME: needs more docs!
+	var v = viewport || winUtils.getBox(doc), // getBox() call for back-compat, in case autoScrollStart() wasn't called
+		html = win.body(doc).parentNode,
+		dx = 0, dy = 0;
+	if(e.clientX < exports.H_TRIGGER_AUTOSCROLL){
+		dx = -exports.H_AUTOSCROLL_VALUE;
+	}else if(e.clientX > v.w - exports.H_TRIGGER_AUTOSCROLL){
+		dx = Math.min(exports.H_AUTOSCROLL_VALUE, maxScrollLeft - html.scrollLeft);	// don't scroll past edge of doc
+	}
+	if(e.clientY < exports.V_TRIGGER_AUTOSCROLL){
+		dy = -exports.V_AUTOSCROLL_VALUE;
+	}else if(e.clientY > v.h - exports.V_TRIGGER_AUTOSCROLL){
+		dy = Math.min(exports.V_AUTOSCROLL_VALUE, maxScrollTop - html.scrollTop);	// don't scroll past edge of doc
+	}
+	window.scrollBy(dx, dy);
+};
+
+exports._validNodes = {"div": 1, "p": 1, "td": 1};
+exports._validOverflow = {"auto": 1, "scroll": 1};
+
+exports.autoScrollNodes = function(e){
+	// summary:
+	//		a handler for mousemove and touchmove events, which scrolls the first available
+	//		Dom element, it falls back to exports.autoScroll()
+	// e: Event
+	//		mousemove/touchmove event
+
+	// FIXME: needs more docs!
+
+	var b, t, w, h, rx, ry, dx = 0, dy = 0, oldLeft, oldTop;
+
+	for(var n = e.target; n;){
+		if(n.nodeType == 1 && (n.tagName.toLowerCase() in exports._validNodes)){
+			var s = domStyle.getComputedStyle(n),
+				overflow = (s.overflow.toLowerCase() in exports._validOverflow),
+				overflowX = (s.overflowX.toLowerCase() in exports._validOverflow),
+				overflowY = (s.overflowY.toLowerCase() in exports._validOverflow);
+			if(overflow || overflowX || overflowY){
+				b = domGeom.getContentBox(n, s);
+				t = domGeom.position(n, true);
+			}
+			// overflow-x
+			if(overflow || overflowX){
+				w = Math.min(exports.H_TRIGGER_AUTOSCROLL, b.w / 2);
+				rx = e.pageX - t.x;
+				if(has("webkit") || has("opera")){
+					// FIXME: this code should not be here, it should be taken into account
+					// either by the event fixing code, or the domGeom.position()
+					// FIXME: this code doesn't work on Opera 9.5 Beta
+					rx += win.body().scrollLeft;
+				}
+				dx = 0;
+				if(rx > 0 && rx < b.w){
+					if(rx < w){
+						dx = -w;
+					}else if(rx > b.w - w){
+						dx = w;
+					}
+					oldLeft = n.scrollLeft;
+					n.scrollLeft = n.scrollLeft + dx;
+				}
+			}
+			// overflow-y
+			if(overflow || overflowY){
+				//console.log(b.l, b.t, t.x, t.y, n.scrollLeft, n.scrollTop);
+				h = Math.min(exports.V_TRIGGER_AUTOSCROLL, b.h / 2);
+				ry = e.pageY - t.y;
+				if(has("webkit") || has("opera")){
+					// FIXME: this code should not be here, it should be taken into account
+					// either by the event fixing code, or the domGeom.position()
+					// FIXME: this code doesn't work on Opera 9.5 Beta
+					ry += win.body().scrollTop;
+				}
+				dy = 0;
+				if(ry > 0 && ry < b.h){
+					if(ry < h){
+						dy = -h;
+					}else if(ry > b.h - h){
+						dy = h;
+					}
+					oldTop = n.scrollTop;
+					n.scrollTop  = n.scrollTop  + dy;
+				}
+			}
+			if(dx || dy){ return; }
+		}
+		try{
+			n = n.parentNode;
+		}catch(x){
+			n = null;
+		}
+	}
+	exports.autoScroll(e);
+};
+
+return exports;
+
+});