From e44a7e37b6c7b5961adaffc62b9042b8d442938e Mon Sep 17 00:00:00 2001
From: mensonge <mensonge@b3834d28-1941-0410-a4f8-b48e95affb8f>
Date: Thu, 13 Nov 2008 09:49:11 +0000
Subject: New feature: basic Ajax suggestion for tags and implementation of
 Dojo toolkit

git-svn-id: https://semanticscuttle.svn.sourceforge.net/svnroot/semanticscuttle/trunk@151 b3834d28-1941-0410-a4f8-b48e95affb8f
---
 includes/js/dojo/dnd/autoscroll.js | 103 +++++++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 includes/js/dojo/dnd/autoscroll.js

(limited to 'includes/js/dojo/dnd/autoscroll.js')

diff --git a/includes/js/dojo/dnd/autoscroll.js b/includes/js/dojo/dnd/autoscroll.js
new file mode 100644
index 0000000..07ab61e
--- /dev/null
+++ b/includes/js/dojo/dnd/autoscroll.js
@@ -0,0 +1,103 @@
+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);
+};
+
+}
-- 
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