Add formvista's 'draglist'.

1 files changed, 295 insertions, 0 deletions

diff --git a/usr/local/www/draglist.js b/usr/local/www/draglist.js
new file mode 100755
index 0000000..a8651ec
--- /dev/null
+++ b/usr/local/www/draglist.js
@@ -0,0 +1,295 @@
+// ----------------------------------------------------------------------------
+// (c) Copyright, DTLink, LLC 1997-2005
+//     http://www.dtlink.com
+//
+// DragList - Drag and Drop Ordered Lists
+//
+// Javascript Support file for formVista <draglist> fvml tag.
+//
+// For more information please see:
+//
+//    http://www.formvista.com/otherprojects/draglist.html
+//
+// For questions or comments please contact us at:
+//
+//     http://www.formvista.com/contact.html
+//
+// LICENSE: This file is governed by the new BSD license. For more information
+// please see the LICENSE.txt file accompanying this package. 
+//
+// REVISION HISTORY:
+//
+// 2004-11-12 YmL:
+//	.	initial revision.
+//
+// 2005-05-28 YmL:
+//	.	pulled out of formVista, relicensed and packaged as a standalone implementation.
+//
+// 2005-06-02 mtmosier:
+//	.	added horizontal dragging support.
+//
+// ------------------------
+
+/**
+* constructor for dragList class
+*/
+
+function fv_dragList( name )
+	{
+
+	// name of this dragList. Must match the id of the root DIV tag.
+
+	this.dragListRootId = name;
+
+	// array of item offsets
+
+	this.offsetsX = new Array();
+	this.offsetsY = new Array();
+
+	}
+
+// ----------------------------------------------
+
+/**
+* setup the draglist prior to use
+*
+* @param string orientation defaults to vert. if set to "horz" renders horizontally.
+* @param string itemTagName. if null defaults to "div". Can be "span".
+*/
+
+fv_dragList.prototype.setup = function( orientation, itemTagName )
+	{
+
+	var horizontal;
+
+	if ( orientation == "horz" )
+		horizontal = true;
+	else
+		horizontal = false;
+
+	this.listRoot = document.getElementById( this.dragListRootId );
+	this.listItems = this.getListItems( itemTagName );
+
+	for (var i = 0; i < this.listItems.length; i++) 
+		{
+
+		if ( this.listItems[i] == undefined )
+			continue;
+
+		if ( horizontal )
+			{
+			Drag.init(this.listItems[i], null, null, null, 0, 0);
+			}
+		else
+			{
+			Drag.init(this.listItems[i], null, 0, 0, null, null);
+			}
+
+		// ---------------------------------------------------
+		// on drag method
+
+		this.listItems[i].onDrag = function( x, y, thisElem ) 
+			{
+
+			x = thisElem.offsetLeft;
+			y = thisElem.offsetTop;
+
+			// this is a callback from the dom-drag code. From within this
+			// function "this" does not refer to the fv_draglist function.
+
+			draglist = getDragList( thisElem );
+
+			draglist.recalcOffsets( itemTagName );
+
+			var pos = draglist.getCurrentOffset( thisElem, itemTagName );
+
+			//var listItems = this.getListItems( itemTagName );
+
+			// if bottom edge is below top of lower item.
+
+			var testMoveUp;
+			var testMoveDown;
+			if ( horizontal )
+				{
+				testMoveUp = (x + draglist.getDivWidth(thisElem) > draglist.offsetsX[pos + 1] + draglist.getDivWidth( draglist.listItems[pos + 1] ));
+				testMoveDown = x < draglist.offsetsX[pos - 1];
+				}
+			else
+				{
+				testMoveUp = (y + draglist.getDivHeight(thisElem) > draglist.offsetsY[pos + 1] + draglist.getDivHeight( draglist.listItems[pos + 1] ));
+				testMoveDown = y < draglist.offsetsY[pos - 1];
+				}
+
+			if (( pos != draglist.listItems.length - 1) && testMoveUp )
+				{ 
+				draglist.listRoot.removeChild(thisElem);
+
+				if ( pos + 1 == draglist.listItems.length )
+					{
+					draglist.listRoot.appendChild( thisElem );
+					}
+				else
+					{
+					draglist.listRoot.insertBefore(thisElem, draglist.listItems[pos+1]);
+					}
+
+				thisElem.style["top"] = "0px";
+				thisElem.style["left"] = "0px";
+				}
+			else if ( pos != 0 && testMoveDown ) 
+				{ 
+				draglist.listRoot.removeChild(thisElem);
+				draglist.listRoot.insertBefore(thisElem, draglist.listItems[pos-1]);
+				thisElem.style["top"] = "0px";
+				thisElem.style["left"] = "0px";
+				}
+
+			};
+
+		this.listItems[i].onDragEnd = function(x,y,thisElem) 
+			{
+			thisElem.style["top"] = "0px";
+			thisElem.style["left"] = "0px";
+			}
+
+		}	// end of for loop.
+
+	this.recalcOffsets( itemTagName );
+
+	}	// end of setup.
+
+// ----------------------------------------------
+
+
+/**
+* update the order value fields and submit the form.
+*/
+
+fv_dragList.prototype.do_submit = function( formName, dragListRootId )
+	{
+
+	var listOrderItems = this.listRoot.getElementsByTagName("input");
+
+	for (var i = 0; i < listOrderItems.length; i++) 
+		{
+		listOrderItems[i].value = i;
+		}
+
+	expr = "document." + formName + ".submit()";
+
+	eval( expr );
+	}
+
+// ----------------------------------------------
+// "Private" methods.
+// ----------------------------------------------
+
+fv_dragList.prototype.recalcOffsets = function( itemTagName ) 
+	{
+	var listItems = this.getListItems( itemTagName );
+
+	for (var i = 0; i < listItems.length; i++) 
+		{
+		this.offsetsX[i] = listItems[i].offsetLeft;
+		this.offsetsY[i] = listItems[i].offsetTop;
+		}
+	}
+
+fv_dragList.prototype.getCurrentOffset = function(elem, itemTagName) 
+	{ 
+	var listItems = this.getListItems( itemTagName );
+
+	for (var i = 0; i < listItems.length; i++) 
+		{
+		if (listItems[i] == elem) 
+			{ 
+			return i;
+			}
+		}
+	}
+
+fv_dragList.prototype.getDivWidth = function(elem) 								  
+	{
+
+	if (( elem == undefined) || ( elem.offsetWidth == undefined ))
+		return( 0 );
+
+	value = elem.offsetWidth;
+	if (isNaN(value))
+		{
+		value = 0;
+		}
+
+	return( value );
+	}
+
+fv_dragList.prototype.getDivHeight = function(elem) 
+	{
+
+	if (( elem == undefined) || ( elem.offsetHeight == undefined ))
+		return( 0 );
+
+	value = elem.offsetHeight;
+	if (isNaN(value))
+		{
+		value = 25;
+		}
+
+	return( value );
+	}
+
+/**
+* return list of draggable items
+*/
+
+fv_dragList.prototype.getListItems = function( itemTagName )
+	{
+	if ( itemTagName == undefined )
+		{
+		itemTagName = "div";
+		}
+
+	var listItems = this.listRoot.getElementsByTagName( itemTagName );
+
+	return( listItems );
+	}
+
+// end of draglist class definition.
+
+// -------------------------------------
+
+/**
+* add a new dragList to the list of draglists on this page
+*
+* This implementatoin supports multiple managed draglists on
+* a single page. The index is contained in a global dragListIndex
+* array that must be declared in the page.
+*/
+
+function addDragList( draglist )
+	{
+	dragListIndex[ draglist.dragListRootId ] = draglist;
+	}
+
+// -------------------------------------------------------
+
+/**
+* given a draggable div element, return the draglist it belongs to
+*
+* @see fv_draglist.prototype.setup
+* @todo this should probably be a method inside the draglist class.
+*/
+
+function getDragList( elem )
+	{
+
+	// given a list item return the drag list it belongs to.
+
+	var draglistContainer = elem.parentNode;
+
+	var draglist = dragListIndex[ draglistContainer.id ];
+
+	return( draglist );
+	}
+
+// END