With an ObjectRegistry you can use code to iteratively create and register instances. E.g.; you couldn't do this and maintain global references to each instance:
for (name in propertySheet) {
var instance = createProperty(name);
}
Simon
Christian Boulanger <[EMAIL PROTECTED]> wrote:
Hello Dann,
what would be the advantage of the object registry over just using
global variables? If you omit the "var" before the variable declaration,
you can access your widget from anywhere...
function foo()
{
globalWidget = new QxWindow;
}
function bar()
{
globalWidget.open();
}
C.
Danny Adair schrieb:
> Hello,
>
> If you want to access objects by a user-defined name from anywhere,
> use the code below (ObjectRegistry.js).
>
> Yesterday, I wanted to access a qooxdoo object from a function which
> hadn't created it.
> Unfortunately, qooxdoo doesn't seem to support that at this stage (and
> iterating through children and checking, e.g., their label/value is
> certainly not a real option).
>
> Google led me to QxObjectDatabase, and that's what this code is based
> on: User-defined strings are mapped to qooxdoo "unique id"s (the
> hashcodes in QxDatabase). I'm not into _javascript_ (excuse my Python
> indentation style) so I'm sure this can be improved. I didn't do any
> error handling.
>
> Hope this will help others.
>
> Cheers,
> Danny
> [EMAIL PROTECTED]
>
> /*
> Object Registry
>
> Usage:
> 1. Create a global registry object, e.g.
> var object_registry = new ObjectRegistry();
> 2. To register an object under a name, use
> object_registry.set(some_object, 'some object')
> 3. To access an object under its registered name (from anywhere), use
> obj = object_registry.get('some object')
>
> Advanced Usage:
> You can register ObjectRegistry objects to create "sub registries":
> 1. Create a new ObjectRegistry object (does not need to be global), e.g.
> var sub_registry = new ObjectRegistry();
> 2. Register the new sub registry with the global registry, e.g.
> object_registry.set(sub_registry, 'my sub registry')
> 3. To register objects with the sub registry, use
> sub_registry.set(other_object, 'other object')
> 4. If you don't have the sub registry in your scope and want to register
> an object with it, access it through the global registry first:
> object_registry.get('my sub registry').set(other_object, 'other
> object')
> 5. Correspondigly, to access an object registered in the sub registry,
> use
> obj = object_registry.get('sub_registry').get('other object')
> */
>
> function ObjectRegistry()
> {
> this._mapping = {};
> };
>
> ObjectRegistry.prototype.set = function(obj, id)
> {
> if (obj instanceof ObjectRegistry)
> {
> this._mapping[id] = obj;
> }
> else
> {
> this._mapping[id] = obj.toHashCode();
> };
> };
>
> ObjectRegistry.prototype.get = function(id)
> {
> var entry = this._mapping[id];
> if (entry instanceof ObjectRegistry)
> {
> return entry;
> }
> else
> {
> return QxObjectDataBase[entry];
> };
> };
>
>
> -------------------------------------------------------
> Using Tomcat but need to do more? Need to support web services, security?
> Get stuff done quickly with pre-integrated technology to make your job
> easier
> Download IBM WebSphere Application Server v.1.0.1 based on Apache
> Geronimo
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>
> Qooxdoo-devel mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/qooxdoo-devel
-------------------------------------------------------
Using Tomcat but need to do more? Need to support web services, security?
Get stuff done quickly with pre-integrated technology to make your job easier
Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo
http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642
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