279 行
9 KiB
JavaScript
279 行
9 KiB
JavaScript
define("dijit/tree/ForestStoreModel", [
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"dojo/_base/array", // array.indexOf array.some
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"dojo/_base/declare", // declare
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"dojo/_base/kernel", // global
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"dojo/_base/lang", // lang.hitch
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"./TreeStoreModel"
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], function(array, declare, kernel, lang, TreeStoreModel){
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// module:
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// dijit/tree/ForestStoreModel
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return declare("dijit.tree.ForestStoreModel", TreeStoreModel, {
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// summary:
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// Interface between a dijit.Tree and a dojo.data store that doesn't have a root item,
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// a.k.a. a store that has multiple "top level" items.
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//
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// description:
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// Use this class to wrap a dojo.data store, making all the items matching the specified query
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// appear as children of a fabricated "root item". If no query is specified then all the
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// items returned by fetch() on the underlying store become children of the root item.
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// This class allows dijit.Tree to assume a single root item, even if the store doesn't have one.
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//
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// When using this class the developer must override a number of methods according to their app and
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// data, including:
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//
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// - onNewRootItem
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// - onAddToRoot
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// - onLeaveRoot
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// - onNewItem
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// - onSetItem
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// Parameters to constructor
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// rootId: String
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// ID of fabricated root item
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rootId: "$root$",
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// rootLabel: String
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// Label of fabricated root item
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rootLabel: "ROOT",
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// query: String
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// Specifies the set of children of the root item.
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// example:
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// | {type:'continent'}
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query: null,
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// End of parameters to constructor
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constructor: function(params){
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// summary:
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// Sets up variables, etc.
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// tags:
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// private
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// Make dummy root item
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this.root = {
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store: this,
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root: true,
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id: params.rootId,
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label: params.rootLabel,
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children: params.rootChildren // optional param
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};
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},
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// =======================================================================
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// Methods for traversing hierarchy
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mayHaveChildren: function(/*dojo/data/Item*/ item){
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// summary:
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// Tells if an item has or may have children. Implementing logic here
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// avoids showing +/- expando icon for nodes that we know don't have children.
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// (For efficiency reasons we may not want to check if an element actually
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// has children until user clicks the expando node)
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// tags:
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// extension
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return item === this.root || this.inherited(arguments);
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},
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getChildren: function(/*dojo/data/Item*/ parentItem, /*function(items)*/ callback, /*function*/ onError){
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// summary:
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// Calls onComplete() with array of child items of given parent item, all loaded.
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if(parentItem === this.root){
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if(this.root.children){
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// already loaded, just return
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callback(this.root.children);
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}else{
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this.store.fetch({
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query: this.query,
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onComplete: lang.hitch(this, function(items){
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this.root.children = items;
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callback(items);
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}),
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onError: onError
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});
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}
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}else{
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this.inherited(arguments);
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}
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},
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// =======================================================================
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// Inspecting items
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isItem: function(/* anything */ something){
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return (something === this.root) ? true : this.inherited(arguments);
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},
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fetchItemByIdentity: function(/* object */ keywordArgs){
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if(keywordArgs.identity == this.root.id){
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var scope = keywordArgs.scope || kernel.global;
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if(keywordArgs.onItem){
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keywordArgs.onItem.call(scope, this.root);
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}
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}else{
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this.inherited(arguments);
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}
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},
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getIdentity: function(/* item */ item){
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return (item === this.root) ? this.root.id : this.inherited(arguments);
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},
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getLabel: function(/* item */ item){
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return (item === this.root) ? this.root.label : this.inherited(arguments);
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},
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// =======================================================================
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// Write interface
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newItem: function(/* dijit/tree/dndSource.__Item */ args, /*Item*/ parent, /*int?*/ insertIndex){
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// summary:
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// Creates a new item. See dojo/data/api/Write for details on args.
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// Used in drag & drop when item from external source dropped onto tree.
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if(parent === this.root){
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this.onNewRootItem(args);
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return this.store.newItem(args);
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}else{
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return this.inherited(arguments);
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}
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},
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onNewRootItem: function(/* dijit/tree/dndSource.__Item */ /*===== args =====*/){
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// summary:
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// User can override this method to modify a new element that's being
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// added to the root of the tree, for example to add a flag like root=true
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},
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pasteItem: function(/*Item*/ childItem, /*Item*/ oldParentItem, /*Item*/ newParentItem, /*Boolean*/ bCopy, /*int?*/ insertIndex){
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// summary:
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// Move or copy an item from one parent item to another.
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// Used in drag & drop
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if(oldParentItem === this.root){
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if(!bCopy){
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// It's onLeaveRoot()'s responsibility to modify the item so it no longer matches
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// this.query... thus triggering an onChildrenChange() event to notify the Tree
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// that this element is no longer a child of the root node
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this.onLeaveRoot(childItem);
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}
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}
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this.inherited(arguments, [childItem,
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oldParentItem === this.root ? null : oldParentItem,
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newParentItem === this.root ? null : newParentItem,
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bCopy,
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insertIndex
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]);
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if(newParentItem === this.root){
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// It's onAddToRoot()'s responsibility to modify the item so it matches
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// this.query... thus triggering an onChildrenChange() event to notify the Tree
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// that this element is now a child of the root node
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this.onAddToRoot(childItem);
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}
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},
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// =======================================================================
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// Handling for top level children
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onAddToRoot: function(/* item */ item){
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// summary:
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// Called when item added to root of tree; user must override this method
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// to modify the item so that it matches the query for top level items
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// example:
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// | store.setValue(item, "root", true);
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// tags:
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// extension
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console.log(this, ": item ", item, " added to root");
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},
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onLeaveRoot: function(/* item */ item){
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// summary:
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// Called when item removed from root of tree; user must override this method
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// to modify the item so it doesn't match the query for top level items
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// example:
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// | store.unsetAttribute(item, "root");
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// tags:
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// extension
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console.log(this, ": item ", item, " removed from root");
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},
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// =======================================================================
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// Events from data store
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_requeryTop: function(){
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// reruns the query for the children of the root node,
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// sending out an onSet notification if those children have changed
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var oldChildren = this.root.children || [];
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this.store.fetch({
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query: this.query,
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onComplete: lang.hitch(this, function(newChildren){
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this.root.children = newChildren;
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// If the list of children or the order of children has changed...
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if(oldChildren.length != newChildren.length ||
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array.some(oldChildren, function(item, idx){ return newChildren[idx] != item;})){
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this.onChildrenChange(this.root, newChildren);
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}
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})
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});
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},
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onNewItem: function(/* dojo/data/api/Item */ item, /* Object */ parentInfo){
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// summary:
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// Handler for when new items appear in the store. Developers should override this
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// method to be more efficient based on their app/data.
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// description:
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// Note that the default implementation requeries the top level items every time
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// a new item is created, since any new item could be a top level item (even in
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// addition to being a child of another item, since items can have multiple parents).
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//
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// If developers can detect which items are possible top level items (based on the item and the
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// parentInfo parameters), they should override this method to only call _requeryTop() for top
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// level items. Often all top level items have parentInfo==null, but
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// that will depend on which store you use and what your data is like.
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// tags:
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// extension
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this._requeryTop();
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this.inherited(arguments);
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},
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onDeleteItem: function(/*Object*/ item){
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// summary:
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// Handler for delete notifications from underlying store
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// check if this was a child of root, and if so send notification that root's children
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// have changed
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if(array.indexOf(this.root.children, item) != -1){
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this._requeryTop();
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}
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this.inherited(arguments);
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},
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onSetItem: function(/* item */ item,
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/* attribute-name-string */ attribute,
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/* Object|Array */ oldValue,
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/* Object|Array */ newValue){
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// summary:
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// Updates the tree view according to changes to an item in the data store.
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// Developers should override this method to be more efficient based on their app/data.
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// description:
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// Handles updates to an item's children by calling onChildrenChange(), and
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// other updates to an item by calling onChange().
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//
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// Also, any change to any item re-executes the query for the tree's top-level items,
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// since this modified item may have started/stopped matching the query for top level items.
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//
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// If possible, developers should override this function to only call _requeryTop() when
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// the change to the item has caused it to stop/start being a top level item in the tree.
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// tags:
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// extension
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this._requeryTop();
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this.inherited(arguments);
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}
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});
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});
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