www.gusucode.com > 一个基于extjs的强大聊天插件源码程序 > 一个基于extjs的强大聊天插件/extjame/ext-jame/js/ext2/source/widgets/tree/TreeDropZone.js
/*
* Ext JS Library 2.0.2
* Copyright(c) 2006-2008, Ext JS, LLC.
* licensing@extjs.com
*
* http://extjs.com/license
*/
/**
* @class Ext.tree.TreeDropZone
* @extends Ext.dd.DropZone
* @constructor
* @param {String/HTMLElement/Element} tree The {@link Ext.tree.TreePanel} for which to enable dropping
* @param {Object} config
*/
if(Ext.dd.DropZone){
Ext.tree.TreeDropZone = function(tree, config){
/**
* @cfg {Boolean} allowParentInsert
* Allow inserting a dragged node between an expanded parent node and its first child that will become a
* sibling of the parent when dropped (defaults to false)
*/
this.allowParentInsert = false;
/**
* @cfg {String} allowContainerDrop
* True if drops on the tree container (outside of a specific tree node) are allowed (defaults to false)
*/
this.allowContainerDrop = false;
/**
* @cfg {String} appendOnly
* True if the tree should only allow append drops (use for trees which are sorted, defaults to false)
*/
this.appendOnly = false;
Ext.tree.TreeDropZone.superclass.constructor.call(this, tree.innerCt, config);
/**
* The TreePanel for this drop zone
* @type Ext.tree.TreePanel
* @property
*/
this.tree = tree;
/**
* Arbitrary data that can be associated with this tree and will be included in the event object that gets
* passed to any nodedragover event handler (defaults to {})
* @type Ext.tree.TreePanel
* @property
*/
this.dragOverData = {};
// private
this.lastInsertClass = "x-tree-no-status";
};
Ext.extend(Ext.tree.TreeDropZone, Ext.dd.DropZone, {
/**
* @cfg {String} ddGroup
* A named drag drop group to which this object belongs. If a group is specified, then this object will only
* interact with other drag drop objects in the same group (defaults to 'TreeDD').
*/
ddGroup : "TreeDD",
/**
* @cfg {String} expandDelay
* The delay in milliseconds to wait before expanding a target tree node while dragging a droppable node
* over the target (defaults to 1000)
*/
expandDelay : 1000,
// private
expandNode : function(node){
if(node.hasChildNodes() && !node.isExpanded()){
node.expand(false, null, this.triggerCacheRefresh.createDelegate(this));
}
},
// private
queueExpand : function(node){
this.expandProcId = this.expandNode.defer(this.expandDelay, this, [node]);
},
// private
cancelExpand : function(){
if(this.expandProcId){
clearTimeout(this.expandProcId);
this.expandProcId = false;
}
},
// private
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;
},
// private
getDropPoint : function(e, n, dd){
var tn = n.node;
if(tn.isRoot){
return tn.allowChildren !== false ? "append" : false; // always append for root
}
var dragEl = n.ddel;
var t = Ext.lib.Dom.getY(dragEl), b = t + dragEl.offsetHeight;
var y = Ext.lib.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";
}
},
// private
onNodeEnter : function(n, dd, e, data){
this.cancelExpand();
},
// private
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;
if(pt == "above"){
returnCls = n.node.isFirst() ? "x-tree-drop-ok-above" : "x-tree-drop-ok-between";
cls = "x-tree-drag-insert-above";
}else if(pt == "below"){
returnCls = n.node.isLast() ? "x-tree-drop-ok-below" : "x-tree-drop-ok-between";
cls = "x-tree-drag-insert-below";
}else{
returnCls = "x-tree-drop-ok-append";
cls = "x-tree-drag-append";
}
if(this.lastInsertClass != cls){
Ext.fly(el).replaceClass(this.lastInsertClass, cls);
this.lastInsertClass = cls;
}
}
}
return returnCls;
},
// private
onNodeOut : function(n, dd, e, data){
this.cancelExpand();
this.removeDropIndicators(n);
},
// private
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,
dropStatus: false
};
var retval = this.tree.fireEvent("beforenodedrop", dropEvent);
if(retval === false || dropEvent.cancel === true || !dropEvent.dropNode){
targetNode.ui.endDrop();
return dropEvent.dropStatus;
}
// allow target changing
targetNode = dropEvent.target;
if(point == "append" && !targetNode.isExpanded()){
targetNode.expand(false, null, function(){
this.completeDrop(dropEvent);
}.createDelegate(this));
}else{
this.completeDrop(dropEvent);
}
return true;
},
// private
completeDrop : function(de){
var ns = de.dropNode, p = de.point, t = de.target;
if(!Ext.isArray(ns)){
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.ui.focus();
if(this.tree.hlDrop){
n.ui.highlight();
}
t.ui.endDrop();
this.tree.fireEvent("nodedrop", de);
},
// private
afterNodeMoved : function(dd, data, e, targetNode, dropNode){
if(this.tree.hlDrop){
dropNode.ui.focus();
dropNode.ui.highlight();
}
this.tree.fireEvent("nodedrop", this.tree, targetNode, data, dd, e);
},
// private
getTree : function(){
return this.tree;
},
// private
removeDropIndicators : function(n){
if(n && n.ddel){
var el = n.ddel;
Ext.fly(el).removeClass([
"x-tree-drag-insert-above",
"x-tree-drag-insert-below",
"x-tree-drag-append"]);
this.lastInsertClass = "_noclass";
}
},
// private
beforeDragDrop : function(target, e, id){
this.cancelExpand();
return true;
},
// private
afterRepair : function(data){
if(data && Ext.enableFx){
data.node.ui.highlight();
}
this.hideProxy();
}
});
}