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Container.js
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Container.js
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if(!dojo._hasResource["dojo.dnd.Container"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojo.dnd.Container"] = true;
dojo.provide("dojo.dnd.Container");
dojo.require("dojo.dnd.common");
dojo.require("dojo.parser");
/*
Container states:
"" - normal state
"Over" - mouse over a container
Container item states:
"" - normal state
"Over" - mouse over a container item
*/
dojo.declare("dojo.dnd.Container", null, {
// summary: a Container object, which knows when mouse hovers over it,
// and know over which element it hovers
// object attributes (for markup)
skipForm: false,
constructor: function(node, params){
// summary: a constructor of the Container
// node: Node: node or node's id to build the container on
// params: Object: a dict of parameters, recognized parameters are:
// creator: Function: a creator function, which takes a data item, and returns an object like that:
// {node: newNode, data: usedData, type: arrayOfStrings}
// skipForm: Boolean: don't start the drag operation, if clicked on form elements
// _skipStartup: Boolean: skip startup(), which collects children, for deferred initialization
// (this is used in the markup mode)
this.node = dojo.byId(node);
if(!params){ params = {}; }
this.creator = params.creator || null;
this.skipForm = params.skipForm;
this.defaultCreator = dojo.dnd._defaultCreator(this.node);
// class-specific variables
this.map = {};
this.current = null;
// states
this.containerState = "";
dojo.addClass(this.node, "dojoDndContainer");
// mark up children
if(!(params && params._skipStartup)){
this.startup();
}
// set up events
this.events = [
dojo.connect(this.node, "onmouseover", this, "onMouseOver"),
dojo.connect(this.node, "onmouseout", this, "onMouseOut"),
// cancel text selection and text dragging
dojo.connect(this.node, "ondragstart", this, "onSelectStart"),
dojo.connect(this.node, "onselectstart", this, "onSelectStart")
];
},
// object attributes (for markup)
creator: function(){}, // creator function, dummy at the moment
// abstract access to the map
getItem: function(/*String*/ key){
// summary: returns a data item by its key (id)
return this.map[key]; // Object
},
setItem: function(/*String*/ key, /*Object*/ data){
// summary: associates a data item with its key (id)
this.map[key] = data;
},
delItem: function(/*String*/ key){
// summary: removes a data item from the map by its key (id)
delete this.map[key];
},
forInItems: function(/*Function*/ f, /*Object?*/ o){
// summary: iterates over a data map skipping members, which
// are present in the empty object (IE and/or 3rd-party libraries).
o = o || dojo.global;
var m = this.map, e = dojo.dnd._empty;
for(var i in this.map){
if(i in e){ continue; }
f.call(o, m[i], i, m);
}
},
clearItems: function(){
// summary: removes all data items from the map
this.map = {};
},
// methods
getAllNodes: function(){
// summary: returns a list (an array) of all valid child nodes
return dojo.query("> .dojoDndItem", this.parent); // NodeList
},
insertNodes: function(data, before, anchor){
// summary: inserts an array of new nodes before/after an anchor node
// data: Array: a list of data items, which should be processed by the creator function
// before: Boolean: insert before the anchor, if true, and after the anchor otherwise
// anchor: Node: the anchor node to be used as a point of insertion
if(!this.parent.firstChild){
anchor = null;
}else if(before){
if(!anchor){
anchor = this.parent.firstChild;
}
}else{
if(anchor){
anchor = anchor.nextSibling;
}
}
if(anchor){
for(var i = 0; i < data.length; ++i){
var t = this._normalizedCreator(data[i]);
this.setItem(t.node.id, {data: t.data, type: t.type});
this.parent.insertBefore(t.node, anchor);
}
}else{
for(var i = 0; i < data.length; ++i){
var t = this._normalizedCreator(data[i]);
this.setItem(t.node.id, {data: t.data, type: t.type});
this.parent.appendChild(t.node);
}
}
return this; // self
},
destroy: function(){
// summary: prepares the object to be garbage-collected
dojo.forEach(this.events, dojo.disconnect);
this.clearItems();
this.node = this.parent = this.current;
},
// markup methods
markupFactory: function(params, node){
params._skipStartup = true;
return new dojo.dnd.Container(node, params);
},
startup: function(){
// summary: collects valid child items and populate the map
// set up the real parent node
this.parent = this.node;
if(this.parent.tagName.toLowerCase() == "table"){
var c = this.parent.getElementsByTagName("tbody");
if(c && c.length){ this.parent = c[0]; }
}
// process specially marked children
dojo.query("> .dojoDndItem", this.parent).forEach(function(node){
if(!node.id){ node.id = dojo.dnd.getUniqueId(); }
var type = node.getAttribute("dndType"),
data = node.getAttribute("dndData");
this.setItem(node.id, {
data: data ? data : node.innerHTML,
type: type ? type.split(/\s*,\s*/) : ["text"]
});
}, this);
},
// mouse events
onMouseOver: function(e){
// summary: event processor for onmouseover
// e: Event: mouse event
var n = e.relatedTarget;
while(n){
if(n == this.node){ break; }
try{
n = n.parentNode;
}catch(x){
n = null;
}
}
if(!n){
this._changeState("Container", "Over");
this.onOverEvent();
}
n = this._getChildByEvent(e);
if(this.current == n){ return; }
if(this.current){ this._removeItemClass(this.current, "Over"); }
if(n){ this._addItemClass(n, "Over"); }
this.current = n;
},
onMouseOut: function(e){
// summary: event processor for onmouseout
// e: Event: mouse event
for(var n = e.relatedTarget; n;){
if(n == this.node){ return; }
try{
n = n.parentNode;
}catch(x){
n = null;
}
}
if(this.current){
this._removeItemClass(this.current, "Over");
this.current = null;
}
this._changeState("Container", "");
this.onOutEvent();
},
onSelectStart: function(e){
// summary: event processor for onselectevent and ondragevent
// e: Event: mouse event
if(!this.skipForm || !dojo.dnd.isFormElement(e)){
dojo.stopEvent(e);
}
},
// utilities
onOverEvent: function(){
// summary: this function is called once, when mouse is over our container
},
onOutEvent: function(){
// summary: this function is called once, when mouse is out of our container
},
_changeState: function(type, newState){
// summary: changes a named state to new state value
// type: String: a name of the state to change
// newState: String: new state
var prefix = "dojoDnd" + type;
var state = type.toLowerCase() + "State";
//dojo.replaceClass(this.node, prefix + newState, prefix + this[state]);
dojo.removeClass(this.node, prefix + this[state]);
dojo.addClass(this.node, prefix + newState);
this[state] = newState;
},
_addItemClass: function(node, type){
// summary: adds a class with prefix "dojoDndItem"
// node: Node: a node
// type: String: a variable suffix for a class name
dojo.addClass(node, "dojoDndItem" + type);
},
_removeItemClass: function(node, type){
// summary: removes a class with prefix "dojoDndItem"
// node: Node: a node
// type: String: a variable suffix for a class name
dojo.removeClass(node, "dojoDndItem" + type);
},
_getChildByEvent: function(e){
// summary: gets a child, which is under the mouse at the moment, or null
// e: Event: a mouse event
var node = e.target;
if(node){
for(var parent = node.parentNode; parent; node = parent, parent = node.parentNode){
if(parent == this.parent && dojo.hasClass(node, "dojoDndItem")){ return node; }
}
}
return null;
},
_normalizedCreator: function(item, hint){
// summary: adds all necessary data to the output of the user-supplied creator function
var t = (this.creator ? this.creator : this.defaultCreator)(item, hint);
if(!dojo.isArray(t.type)){ t.type = ["text"]; }
if(!t.node.id){ t.node.id = dojo.dnd.getUniqueId(); }
dojo.addClass(t.node, "dojoDndItem");
return t;
}
});
dojo.dnd._createNode = function(tag){
// summary: returns a function, which creates an element of given tag
// (SPAN by default) and sets its innerHTML to given text
// tag: String: a tag name or empty for SPAN
if(!tag){ return dojo.dnd._createSpan; }
return function(text){ // Function
var n = dojo.doc.createElement(tag);
n.innerHTML = text;
return n;
};
};
dojo.dnd._createTrTd = function(text){
// summary: creates a TR/TD structure with given text as an innerHTML of TD
// text: String: a text for TD
var tr = dojo.doc.createElement("tr");
var td = dojo.doc.createElement("td");
td.innerHTML = text;
tr.appendChild(td);
return tr; // Node
};
dojo.dnd._createSpan = function(text){
// summary: creates a SPAN element with given text as its innerHTML
// text: String: a text for SPAN
var n = dojo.doc.createElement("span");
n.innerHTML = text;
return n; // Node
};
// dojo.dnd._defaultCreatorNodes: Object: a dicitionary, which maps container tag names to child tag names
dojo.dnd._defaultCreatorNodes = {ul: "li", ol: "li", div: "div", p: "div"};
dojo.dnd._defaultCreator = function(node){
// summary: takes a container node, and returns an appropriate creator function
// node: Node: a container node
var tag = node.tagName.toLowerCase();
var c = tag == "table" ? dojo.dnd._createTrTd : dojo.dnd._createNode(dojo.dnd._defaultCreatorNodes[tag]);
return function(item, hint){ // Function
var isObj = dojo.isObject(item) && item;
var data = (isObj && item.data) ? item.data : item;
var type = (isObj && item.type) ? item.type : ["text"];
var t = String(data), n = (hint == "avatar" ? dojo.dnd._createSpan : c)(t);
n.id = dojo.dnd.getUniqueId();
return {node: n, data: data, type: type};
};
};
}

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