Component Manager in VS .NET

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SimpleContainer = function() { SimpleContainerinitializeBase(this); this_components = {}; }; SimpleContainerprototype = { addComponent: function(component) { this_components[componentget_id()] = component; }, removeComponent: function(component) { this_components[componentget_id()] = null; }, findComponent: function(componentId) { return this_components[componentId]; }, getComponents: function() { var compArr = []; for (var compName in components) { compArr[compArrlength] = components[compName]; } return compArr; } } SimpleContainerregisterClass("SimpleContainer", null , SysIContainer); var simpleContainer = new SimpleContainer(); NewObject = function() { this_id = null; }; NewObjectprototype = { set_id: function(value) { this_id = value; }, get_id: function() { return this_id; } }; // create a new component var myNewObject = new NewObject();
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4: SysApplication
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myNewObjectset_id("MyNewObject"); simpleContaineraddComponent(myNewObject); // wipe out what myNewObject points to // for demonstration purposes myNewObject = null; // retrieve myNewObject from simpleContainer myNewObject = $find("MyNewObject", simpleContainer);
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In this example, we first declare a new type, SimpleContainer
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SimpleContainer implements the SysIContainer interface and pro-
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vides implementations for the required methods Next, we create an instance of the SimpleContainer type and assign to the variable
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simpleContainer Next, we define a new object, NewObject, and add the set_id and get_id methods to its prototype We then create an instance
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of NewObject and add it to SimpleContainer using SimpleContainer's
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addComponent method After the MyNewObject has been added to SimpleContainer, we retrieve it using the $find method, passing in the ID MyNewObject and simpleContainer as the parent container to search in
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When the $find method begins to execute, it determines that the
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parent parameter is present and that it implements the SysIContainer
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interface After it determines this, it executes the findComponent method on the parent parameter, passing in the id of the component to look for It s then up to the implementation of the findComponent method to return the correct object Because SysApplication implements SysIContainer, we can also pass it in as the parent parameter and have the same effect as not passing in a parent parameter at all
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var simpleContainer = $find("SimpleContainer", SysApplication);
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One thing to note about the SysIContainer interface is that although the method names all reference components (addComponent, find
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Component, and so on), there s nothing that prohibits noncomponents
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from being stored in an object that implements the SysIContainer interface This is actually what we did in the previous example To us, it seems
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like the method names on this interface are poorly named and should not refer to components at all The second alternative use of the $find method is to find a value of a property that is attached to an object If an ID and a parent are supplied to the $find method and the parent doesn t implement the SysIContainer interface, the ID is used as a property name on the parent, and the value assigned to that property is returned The following listing demonstrates this idea:
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var someObject = { name: "MyName" }; var objectsName = $find("name", someObject); // alerts "MyName" alert (objectsName);
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This alternative use of the $find method is simple and relies on the associative array property of objects For our code example above, the executed code that returns the property s value is equivalent to the following:
var id = "name" return someObject[id];
These are the two alternative uses of the $find method
Removing a Component After we have a component registered, we can remove it using the remove Component method This is done by passing in the component we want to remove to the method call, as shown in Listing 47
Listing 47 Using removeComponent
$create( MyComponent, {id: "MyNewComponent"}, null, null, null); var foundComponent = $find("MyNewComponent"); alert (foundComponentget_id()); SysApplicationremoveComponent(foundComponent);
4: SysApplication
Listing 47 continued
foundComponent = $find("MyNewComponent"); if (foundComponent !== null) { alert ("Found Component"); } else { alert ("Didn't find Component"); }
A common reason we ll want to remove a component is that we re done with it and are ready to remove it from memory Cleaning up unneeded components from SysApplication is a good way to keep your application running smoothly and to keep its memory footprint small
Getting Components Because the components are stored in an object versus an array, getting a list of the currently registered components requires a for in loop SysApplication provides a method, getComponents, which executes the for in loop for us, which we can use to retrieve an array of the currently registered components Listing 48 shows an example using this method