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YAHOO.ext.tree.TreeDropZone = function(tree, config){
this.allowParentInsert = false;
this.allowContainerDrop = false;
this.appendOnly = false;
YAHOO.ext.tree.TreeDropZone.superclass.constructor.call(this, tree.container, config);
this.tree = tree;
this.lastInsertClass = 'ytree-no-status';
this.dragOverData = {};
};
YAHOO.extendX(YAHOO.ext.tree.TreeDropZone, YAHOO.ext.dd.DropZone, {
ddGroup : 'TreeDD',
expandDelay : 1000,
expandNode : function(node){
if(node.hasChildNodes() && !node.isExpanded()){
node.expand(false, null, this.triggerCacheRefresh.createDelegate(this));
}
},
queueExpand : function(node){
this.expandProcId = this.expandNode.defer(this.expandDelay, this, [node]);
},
cancelExpand : function(){
if(this.expandProcId){
clearTimeout(this.expandProcId);
this.expandProcId = false;
}
},
isValidDropPoint : function(n, pt, dd, e, data){
if(!n || !data){ return false; }
var targetNode = n.node;
var dropNode = data.node;
// default drop rules
if(!(targetNode && targetNode.isTarget && pt)){
return false;
}
if(pt == 'append' && targetNode.allowChildren === false){
return false;
}
if((pt == 'above' || pt == 'below') && (targetNode.parentNode && targetNode.parentNode.allowChildren === false)){
return false;
}
if(dropNode && (targetNode == dropNode || dropNode.contains(targetNode))){
return false;
}
// reuse the object
var overEvent = this.dragOverData;
overEvent.tree = this.tree;
overEvent.target = targetNode;
overEvent.data = data;
overEvent.point = pt;
overEvent.source = dd;
overEvent.rawEvent = e;
overEvent.dropNode = dropNode;
overEvent.cancel = false;
var result = this.tree.fireEvent('nodedragover', overEvent);
return overEvent.cancel === false && result !== false;
},
getDropPoint : function(e, n, dd){
var tn = n.node;
if(tn.isRoot){
return tn.allowChildren !== false ? 'ap-pend' : false; // always append for root
}
var dragEl = n.ddel;
var t = YAHOO.util.Dom.getY(dragEl), b = t + dragEl.offsetHeight;
var y = YAHOO.util.Event.getPageY(e);
var noAppend = tn.allowChildren === false || tn.isLeaf();
if(this.appendOnly || tn.parentNode.allowChildren === false){
return noAppend ? false : 'append';
}
var noBelow = false;
if(!this.allowParentInsert){
noBelow = tn.hasChildNodes() && tn.isExpanded();
}
var q = (b - t) / (noAppend ? 2 : 3);
if(y >= t && y < t + q){
return 'above';
}else if(!noBelow && (noAppend || y >= b-q && y <= b)){
return 'below';
}else{
return 'append';
}
return false;
},
onNodeEnter : function(n, dd, e, data){
this.cancelExpand();
},
onNodeOver : function(n, dd, e, data){
var pt = this.getDropPoint(e, n, dd);
var node = n.node;
// auto node expand check
if(!this.expandProcId && pt == 'append' && node.hasChildNodes() && !n.node.isExpanded()){
this.queueExpand(node);
}else if(pt != 'append'){
this.cancelExpand();
}
// set the insert point style on the target node
var returnCls = this.dropNotAllowed;
if(this.isValidDropPoint(n, pt, dd, e, data)){
if(pt){
var el = n.ddel;
var cls, returnCls;
if(pt == 'above'){
returnCls = n.node.isFirst() ? 'ytree-drop-ok-above' : 'ytree-drop-ok-between';
cls = 'ytree-drag-insert-above';
}else if(pt == 'below'){
returnCls = n.node.isLast() ? 'ytree-drop-ok-below' : 'ytree-drop-ok-between';
cls = 'ytree-drag-insert-below';
}else{
returnCls = 'ytree-drop-ok-append';
cls = 'ytree-drag-append';
}
if(this.lastInsertClass != cls){
YAHOO.util.Dom.replaceClass(el, this.lastInsertClass, cls);
this.lastInsertClass = cls;
}
}
}
return returnCls;
},
onNodeOut : function(n, dd, e, data){
this.cancelExpand();
this.removeDropIndicators(n);
},
onNodeDrop : function(n, dd, e, data){
var point = this.getDropPoint(e, n, dd);
var targetNode = n.node;
targetNode.ui.startDrop();
if(!this.isValidDropPoint(n, point, dd, e, data)){
targetNode.ui.endDrop();
return false;
}
// first try to find the drop node
var dropNode = data.node || (dd.getTreeNode ? dd.getTreeNode(data, targetNode, point, e) : null);
var dropEvent = {
tree : this.tree,
target: targetNode,
data: data,
point: point,
source: dd,
rawEvent: e,
dropNode: dropNode,
cancel: dropNode ? false : true
};
var retval = this.tree.fireEvent('beforenodedrop', dropEvent);
if(retval === false || dropEvent.cancel === true || !dropEvent.dropNode){
targetNode.ui.endDrop();
return false;
}
if(point == 'append' && !targetNode.isExpanded()){
targetNode.expand(false, null, function(){
this.completeDrop(dropEvent);
}.createDelegate(this));
}else{
this.completeDrop(dropEvent);
}
return true;
},
completeDrop : function(de){
var ns = de.dropNode, p = de.point, t = de.target;
if(!(ns instanceof Array)){
ns = [ns];
}
var n;
for(var i = 0, len = ns.length; i < len; i++){
n = ns[i];
if(p == 'above'){
t.parentNode.insertBefore(n, t);
}else if(p == 'below'){
t.parentNode.insertBefore(n, t.nextSibling);
}else{
t.appendChild(n);
}
}
n.select(); // select and highlight the last insert
if(this.tree.hlDrop){
n.ui.highlight();
}
t.ui.endDrop();
this.tree.fireEvent('nodedrop', de);
},
afterNodeMoved : function(dd, data, e, targetNode, dropNode){
if(this.tree.hlDrop){
dropNode.select();
dropNode.ui.highlight();
}
this.tree.fireEvent('nodedrop', this.tree, targetNode, data, dd, e);
},
getTree : function(){
return this.tree;
},
removeDropIndicators : function(n){
if(n && n.ddel){
var el = n.ddel;
YAHOO.util.Dom.removeClass(el, 'ytree-drag-insert-above');
YAHOO.util.Dom.removeClass(el, 'ytree-drag-insert-below');
YAHOO.util.Dom.removeClass(el, 'ytree-drag-append');
this.lastInsertClass = '_noclass';
}
},
beforeDragDrop : function(target, e, id){
this.cancelExpand();
return true;
},
afterRepair : function(data){
if(data){
data.node.ui.highlight();
}
this.hideProxy();
}
});
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