Tree.js
/**
* @class Ext.data.Tree
* @extends Ext.util.Observable
* Represents a tree data structure and bubbles all the events for its nodes. The nodes
* in the tree have most standard DOM functionality.
* @constructor
* @param {Node} root （可选） The root node
*/
Ext.data.Tree = function(root){
this.nodeHash = {};
/**
* The root node for this tree
* @type Node
*/
this.root = null;
if(root){
this.setRootNode(root);
}
this.addEvents({
/**
* @event append
* Fires when a new child node is appended to a node in this tree.
* @param {Tree} tree The owner tree
* @param {Node} parent The parent node
* @param {Node} node The newly appended node
* @param {Number} index The index of the newly appended node
*/
"append" : true,
/**
* @event remove
* Fires when a child node is removed from a node in this tree.
* @param {Tree} tree The owner tree
* @param {Node} parent The parent node
* @param {Node} node The child node removed
*/
"remove" : true,
/**
* @event move
* Fires when a node is moved to a new location in the tree
* @param {Tree} tree The owner tree
* @param {Node} node The node moved
* @param {Node} oldParent The old parent of this node
* @param {Node} newParent The new parent of this node
* @param {Number} index The index it was moved to
*/
"move" : true,
/**
* @event insert
* Fires when a new child node is inserted in a node in this tree.
* @param {Tree} tree The owner tree
* @param {Node} parent The parent node
* @param {Node} node The child node inserted
* @param {Node} refNode The child node the node was inserted before
*/
"insert" : true,
/**
* @event beforeappend
* Fires before a new child is appended to a node in this tree, return false to cancel the append.
* @param {Tree} tree The owner tree
* @param {Node} parent The parent node
* @param {Node} node The child node to be appended
*/
"beforeappend" : true,
/**
* @event beforeremove
* Fires before a child is removed from a node in this tree, return false to cancel the remove.
* @param {Tree} tree The owner tree
* @param {Node} parent The parent node
* @param {Node} node The child node to be removed
*/
"beforeremove" : true,
/**
* @event beforemove
* Fires before a node is moved to a new location in the tree. Return false to cancel the move.
* @param {Tree} tree The owner tree
* @param {Node} node The node being moved
* @param {Node} oldParent The parent of the node
* @param {Node} newParent The new parent the node is moving to
* @param {Number} index The index it is being moved to
*/
"beforemove" : true,
/**
* @event beforeinsert
* Fires before a new child is inserted in a node in this tree, return false to cancel the insert.
* @param {Tree} tree The owner tree
* @param {Node} parent The parent node
* @param {Node} node The child node to be inserted
* @param {Node} refNode The child node the node is being inserted before
*/
"beforeinsert" : true
});
Ext.data.Tree.superclass.constructor.call(this);
};
Ext.extend(Ext.data.Tree, Ext.util.Observable, {
pathSeparator: "/",
/**
* Returns this root node for this tree
* @return {Node}
*/
getRootNode : function(){
return this.root;
},
/**
* Sets the root node for this tree
* @param {Node} node
* @return {Node}
*/
setRootNode : function(node){
this.root = node;
node.ownerTree = this;
node.isRoot = true;
this.registerNode(node);
return node;
},
/**
* Gets a node in this tree by its id
* @param {String} id
* @return {Node}
*/
getNodeById : function(id){
return this.nodeHash[id];
},
registerNode : function(node){
this.nodeHash[node.id] = node;
},
unregisterNode : function(node){
delete this.nodeHash[node.id];
},
toString : function(){
return "[Tree"+(this.id?" "+this.id:"")+"]";
}
});
/**
* @class Ext.data.Node
* @extends Ext.util.Observable
* @cfg {Boolean} leaf true if this node is a leaf and does not have children
* @cfg {String} id The id for this node. If one is not specified, one is generated.
* @constructor
* @param {Object} attributes The attributes/config for the node
*/
Ext.data.Node = function(attributes){
/**
* The attributes supplied for the node. You can use this property to access any custom attributes you supplied.
* @type {Object}
*/
this.attributes = attributes || {};
this.leaf = this.attributes.leaf;
/**
* The node id. @type String
*/
this.id = this.attributes.id;
if(!this.id){
this.id = Ext.id(null, "ynode-");
this.attributes.id = this.id;
}
/**
* All child nodes of this node. @type Array
*/
this.childNodes = [];
if(!this.childNodes.indexOf){ // indexOf is a must
this.childNodes.indexOf = function(o){
for(var i = 0, len = this.length; i < len; i++){
if(this[i] == o) return i;
}
return -1;
};
}
/**
* The parent node for this node. @type Node
*/
this.parentNode = null;
/**
* The first direct child node of this node, or null if this node has no child nodes. @type Node
*/
this.firstChild = null;
/**
* The last direct child node of this node, or null if this node has no child nodes. @type Node
*/
this.lastChild = null;
/**
* The node immediately preceding this node in the tree, or null if there is no sibling node. @type Node
*/
this.previousSibling = null;
/**
* The node immediately following this node in the tree, or null if there is no sibling node. @type Node
*/
this.nextSibling = null;
this.addEvents({
/**
* @event append
* Fires when a new child node is appended
* @param {Tree} tree The owner tree
* @param {Node} this This node
* @param {Node} node The newly appended node
* @param {Number} index The index of the newly appended node
*/
"append" : true,
/**
* @event remove
* Fires when a child node is removed
* @param {Tree} tree The owner tree
* @param {Node} this This node
* @param {Node} node The removed node
*/
"remove" : true,
/**
* @event move
* Fires when this node is moved to a new location in the tree
* @param {Tree} tree The owner tree
* @param {Node} this This node
* @param {Node} oldParent The old parent of this node
* @param {Node} newParent The new parent of this node
* @param {Number} index The index it was moved to
*/
"move" : true,
/**
* @event insert
* Fires when a new child node is inserted.
* @param {Tree} tree The owner tree
* @param {Node} this This node
* @param {Node} node The child node inserted
* @param {Node} refNode The child node the node was inserted before
*/
"insert" : true,
/**
* @event beforeappend
* Fires before a new child is appended, return false to cancel the append.
* @param {Tree} tree The owner tree
* @param {Node} this This node
* @param {Node} node The child node to be appended
*/
"beforeappend" : true,
/**
* @event beforeremove
* Fires before a child is removed, return false to cancel the remove.
* @param {Tree} tree The owner tree
* @param {Node} this This node
* @param {Node} node The child node to be removed
*/
"beforeremove" : true,
/**
* @event beforemove
* Fires before this node is moved to a new location in the tree. Return false to cancel the move.
* @param {Tree} tree The owner tree
* @param {Node} this This node
* @param {Node} oldParent The parent of this node
* @param {Node} newParent The new parent this node is moving to
* @param {Number} index The index it is being moved to
*/
"beforemove" : true,
/**
* @event beforeinsert
* Fires before a new child is inserted, return false to cancel the insert.
* @param {Tree} tree The owner tree
* @param {Node} this This node
* @param {Node} node The child node to be inserted
* @param {Node} refNode The child node the node is being inserted before
*/
"beforeinsert" : true
});
this.listeners = this.attributes.listeners;
Ext.data.Node.superclass.constructor.call(this);
};
Ext.extend(Ext.data.Node, Ext.util.Observable, {
fireEvent : function(evtName){
// first do standard event for this node
if(Ext.data.Node.superclass.fireEvent.apply(this, arguments) === false){
return false;
}
// then bubble it up to the tree if the event wasn't cancelled
var ot = this.getOwnerTree();
if(ot){
if(ot.fireEvent.apply(this.ownerTree, arguments) === false){
return false;
}
}
return true;
},
/**
* Returns true if this node is a leaf
* @return {Boolean}
*/
isLeaf : function(){
return this.leaf === true;
},
// private
setFirstChild : function(node){
this.firstChild = node;
},
//private
setLastChild : function(node){
this.lastChild = node;
},
/**
* Returns true if this node is the last child of its parent
* @return {Boolean}
*/
isLast : function(){
return (!this.parentNode ? true : this.parentNode.lastChild == this);
},
/**
* Returns true if this node is the first child of its parent
* @return {Boolean}
*/
isFirst : function(){
return (!this.parentNode ? true : this.parentNode.firstChild == this);
},
hasChildNodes : function(){
return !this.isLeaf() && this.childNodes.length > 0;
},
/**
* Insert node(s) as the last child node of this node.
* @param {Node/Array} node The node or Array of nodes to append
* @return {Node} The appended node if single append, or null if an array was passed
*/
appendChild : function(node){
var multi = false;
if(node instanceof Array){
multi = node;
}else if(arguments.length > 1){
multi = arguments;
}
// if passed an array or multiple args do them one by one
if(multi){
for(var i = 0, len = multi.length; i < len; i++) {
this.appendChild(multi[i]);
}
}else{
if(this.fireEvent("beforeappend", this.ownerTree, this, node) === false){
return false;
}
var index = this.childNodes.length;
var oldParent = node.parentNode;
// it's a move, make sure we move it cleanly
if(oldParent){
if(node.fireEvent("beforemove", node.getOwnerTree(), node, oldParent, this, index) === false){
return false;
}
oldParent.removeChild(node);
}
index = this.childNodes.length;
if(index == 0){
this.setFirstChild(node);
}
this.childNodes.push(node);
node.parentNode = this;
var ps = this.childNodes[index-1];
if(ps){
node.previousSibling = ps;
ps.nextSibling = node;
}else{
node.previousSibling = null;
}
node.nextSibling = null;
this.setLastChild(node);
node.setOwnerTree(this.getOwnerTree());
this.fireEvent("append", this.ownerTree, this, node, index);
if(oldParent){
node.fireEvent("move", this.ownerTree, node, oldParent, this, index);
}
return node;
}
},
/**
* Removes a child node from this node.
* @param {Node} node The node to remove
* @return {Node} The removed node
*/
removeChild : function(node){
var index = this.childNodes.indexOf(node);
if(index == -1){
return false;
}
if(this.fireEvent("beforeremove", this.ownerTree, this, node) === false){
return false;
}
// remove it from childNodes collection
this.childNodes.splice(index, 1);
// update siblings
if(node.previousSibling){
node.previousSibling.nextSibling = node.nextSibling;
}
if(node.nextSibling){
node.nextSibling.previousSibling = node.previousSibling;
}
// update child refs
if(this.firstChild == node){
this.setFirstChild(node.nextSibling);
}
if(this.lastChild == node){
this.setLastChild(node.previousSibling);
}
node.setOwnerTree(null);
// clear any references from the node
node.parentNode = null;
node.previousSibling = null;
node.nextSibling = null;
this.fireEvent("remove", this.ownerTree, this, node);
return node;
},
/**
* Inserts the first node before the second node in this nodes childNodes collection.
* @param {Node} node The node to insert
* @param {Node} refNode The node to insert before (if null the node is appended)
* @return {Node} The inserted node
*/
insertBefore : function(node, refNode){
if(!refNode){ // like standard Dom, refNode can be null for append
return this.appendChild(node);
}
// nothing to do
if(node == refNode){
return false;
}
if(this.fireEvent("beforeinsert", this.ownerTree, this, node, refNode) === false){
return false;
}
var index = this.childNodes.indexOf(refNode);
var oldParent = node.parentNode;
var refIndex = index;
// when moving internally, indexes will change after remove
if(oldParent == this && this.childNodes.indexOf(node) < index){
refIndex--;
}
// it's a move, make sure we move it cleanly
if(oldParent){
if(node.fireEvent("beforemove", node.getOwnerTree(), node, oldParent, this, index, refNode) === false){
return false;
}
oldParent.removeChild(node);
}
if(refIndex == 0){
this.setFirstChild(node);
}
this.childNodes.splice(refIndex, 0, node);
node.parentNode = this;
var ps = this.childNodes[refIndex-1];
if(ps){
node.previousSibling = ps;
ps.nextSibling = node;
}else{
node.previousSibling = null;
}
node.nextSibling = refNode;
refNode.previousSibling = node;
node.setOwnerTree(this.getOwnerTree());
this.fireEvent("insert", this.ownerTree, this, node, refNode);
if(oldParent){
node.fireEvent("move", this.ownerTree, node, oldParent, this, refIndex, refNode);
}
return node;
},
/**
* Returns the child node at the specified index.
* @param {Number} index
* @return {Node}
*/
item : function(index){
return this.childNodes[index];
},
/**
* Replaces one child node in this node with another.
* @param {Node} newChild The replacement node
* @param {Node} oldChild The node to replace
* @return {Node} The replaced node
*/
replaceChild : function(newChild, oldChild){
this.insertBefore(newChild, oldChild);
this.removeChild(oldChild);
return oldChild;
},
/**
* Returns the index of a child node
* @param {Node} node
* @return {Number} The index of the node or -1 if it was not found
*/
indexOf : function(child){
return this.childNodes.indexOf(child);
},
/**
* Returns the tree this node is in.
* @return {Tree}
*/
getOwnerTree : function(){
// if it doesn't have one, look for one
if(!this.ownerTree){
var p = this;
while(p){
if(p.ownerTree){
this.ownerTree = p.ownerTree;
break;
}
p = p.parentNode;
}
}
return this.ownerTree;
},
/**
* Returns depth of this node (the root node has a depth of 0)
* @return {Number}
*/
getDepth : function(){
var depth = 0;
var p = this;
while(p.parentNode){
++depth;
p = p.parentNode;
}
return depth;
},
// private
setOwnerTree : function(tree){
// if it's move, we need to update everyone
if(tree != this.ownerTree){
if(this.ownerTree){
this.ownerTree.unregisterNode(this);
}
this.ownerTree = tree;
var cs = this.childNodes;
for(var i = 0, len = cs.length; i < len; i++) {
cs[i].setOwnerTree(tree);
}
if(tree){
tree.registerNode(this);
}
}
},
/**
* Returns the path for this node. The path can be used to expand or select this node programmatically.
* @param {String} attr （可选） The attr to use for the path (defaults to the node's id)
* @return {String} The path
*/
getPath : function(attr){
attr = attr || "id";
var p = this.parentNode;
var b = [this.attributes[attr]];
while(p){
b.unshift(p.attributes[attr]);
p = p.parentNode;
}
var sep = this.getOwnerTree().pathSeparator;
return sep + b.join(sep);
},
/**
* Bubbles up the tree from this node, calling the specified function with each node. The scope (<i>this</i>) of
* function call will be the scope provided or the current node. The arguments to the function
* will be the args provided or the current node. If the function returns false at any point,
* the bubble is stopped.
* @param {Function} fn The function to call
* @param {Object} scope （可选） The scope of the function (defaults to current node)
* @param {Array} args （可选） The args to call the function with (default to passing the current node)
*/
bubble : function(fn, scope, args){
var p = this;
while(p){
if(fn.call(scope || p, args || p) === false){
break;
}
p = p.parentNode;
}
},
/**
* Cascades down the tree from this node, calling the specified function with each node. The scope (<i>this</i>) of
* function call will be the scope provided or the current node. The arguments to the function
* will be the args provided or the current node. If the function returns false at any point,
* the cascade is stopped on that branch.
* @param {Function} fn The function to call
* @param {Object} scope （可选） The scope of the function (defaults to current node)
* @param {Array} args （可选） The args to call the function with (default to passing the current node)
*/
cascade : function(fn, scope, args){
if(fn.call(scope || this, args || this) !== false){
var cs = this.childNodes;
for(var i = 0, len = cs.length; i < len; i++) {
cs[i].cascade(fn, scope, args);
}
}
},
/**
* Interates the child nodes of this node, calling the specified function with each node. The scope (<i>this</i>) of
* function call will be the scope provided or the current node. The arguments to the function
* will be the args provided or the current node. If the function returns false at any point,
* the iteration stops.
* @param {Function} fn The function to call
* @param {Object} scope （可选） The scope of the function (defaults to current node)
* @param {Array} args （可选） The args to call the function with (default to passing the current node)
*/
eachChild : function(fn, scope, args){
var cs = this.childNodes;
for(var i = 0, len = cs.length; i < len; i++) {
if(fn.call(scope || this, args || cs[i]) === false){
break;
}
}
},
/**
* Finds the first child that has the attribute with the specified value.
* @param {String} attribute The attribute name
* @param {Mixed} value The value to search for
* @return {Node} The found child or null if none was found
*/
findChild : function(attribute, value){
var cs = this.childNodes;
for(var i = 0, len = cs.length; i < len; i++) {
if(cs[i].attributes[attribute] == value){
return cs[i];
}
}
return null;
},
/**
* Finds the first child by a custom function. The child matches if the function passed
* returns true.
* @param {Function} fn
* @param {Object} scope （可选）
* @return {Node} The found child or null if none was found
*/
findChildBy : function(fn, scope){
var cs = this.childNodes;
for(var i = 0, len = cs.length; i < len; i++) {
if(fn.call(scope||cs[i], cs[i]) === true){
return cs[i];
}
}
return null;
},
/**
* Sorts this nodes children using the supplied sort function
* @param {Function} fn
* @param {Object} scope （可选）
*/
sort : function(fn, scope){
var cs = this.childNodes;
var len = cs.length;
if(len > 0){
var sortFn = scope ? function(){fn.apply(scope, arguments);} : fn;
cs.sort(sortFn);
for(var i = 0; i < len; i++){
var n = cs[i];
n.previousSibling = cs[i-1];
n.nextSibling = cs[i+1];
if(i == 0){
this.setFirstChild(n);
}
if(i == len-1){
this.setLastChild(n);
}
}
}
},
/**
* Returns true if this node is an ancestor (at any point) of the passed node.
* @param {Node} node
* @return {Boolean}
*/
contains : function(node){
return node.isAncestor(this);
},
/**
* Returns true if the passed node is an ancestor (at any point) of this node.
* @param {Node} node
* @return {Boolean}
*/
isAncestor : function(node){
var p = this.parentNode;
while(p){
if(p == node){
return true;
}
p = p.parentNode;
}
return false;
},
toString : function(){
return "[Node"+(this.id?" "+this.id:"")+"]";
}
});
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