How flex creates instances of components?

Hi all

I have a small doubt about creating instances of components.

I have a scenario where I have a datagrid with 100 records. each record using an itemrenderer IE check box. so according to the 100 records there may be 100 checkboxes in datagrid... But in my datagrid visible records are only 20... and I have to scroll datagrid...

So what my questions is weather flex creates all instances of box 100 for 100 records or it will create only visible 20 boxes for 20 records... ?  I think you got my point?

Same scenario will also apply to the viewstack?

Nice explanation...

@Flex4... Yes, it will create all the 100 records in DataGrid...

Come to ViewStack... creating varies on the ViewStack container's creationPolicy property...

Containers with multiple views, such as the ViewStack and accordion, do not immediately create all of their descendants, but only those descendants that are visible in the initial view. Flex shifted the instantiation of the descendants who are not initially visible until the user navigates to a view that contains them. The following containers have multiple views and, therefore, are defined as navigator containers:

ViewStack
TabNavigator
Accordion

When you instantiate a navigator, Flex container creates all the children of higher level. For example, creating a ViewStack container triggers the creation of each of its points of view, but not controls within these points of view. The creationPolicy property determines the creation of the child controls within each view.

When you set the property creationPolicy auto (the default), containers of navigator instantiate only the controls and their children who appear in the initial view.

When the user navigates to another Panel in the accordion container, the container of browser creates the next set of controls and recursively creates the controls in the view of the new and their descendants. You can use the ViewStack container's creationPolicy property to change this behavior.

The possible varlues for creationPolicy are all, auto (default), none and queued.

Thank you

Jean Claude

Tags: Flex

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