Hi Christian,
The advantages are many to have an object registry.
#1. With an object registry, you can have named access to objects,
to iterate through the objects and perform
actions upon them (as simon has rightly said).
#2. If you are creating realtime applications (i.e, product like)
you would end up
building custom objects (like forms, Grids, Lookups).
(Ex.
think about a generic data entry form, with a api on top of
it to quickly create the visual screen along
with features for
- Creating variables & binding them to a visual control [Ex.
QxTextField]
- Loading data from a xml request and updating the variables
and with the help of the object registry,
update the visual controls
- Iterate and collect data from the visual controls using
the object registry and fire a xml request to push/save
the data.
)
An object registry would come in very handy, to code such
iterative tasks and thus saving on production time.
#3. With an object registry, and having one at the level of every
container control (on the likes of the "children" property)
will open up scope to do a lot many things, on the lines of
building / extending the visual framework.
cheers
-sundar
Simon Bull wrote:
Hi Christian,
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];
> };
> };
>
>
> -------------------------------------------------------
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