Symbian
Symbian OS Library

SYMBIAN OS V9.3

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Window hierarchy


Parent windows

In a running application, all window instances are arranged in a hierarchy, illustrated in the diagram below, in which each window has a parent. The window server has a window not owned by the client, called the "root" window which is the parent of all the group windows.

The diagram shows the relationship between parent and child windows, and window groups, at run-time. Arrows indicate "is a parent of".

The relationship between parent and child windows has the following properties:

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Sibling windows

If a window has multiple children, these are known as siblings. Sibling windows are maintained in a list, and the parent window owns a link to the first window in the sibling list. The order of the windows in the sibling list represents the windows ordinal position which determines which windows are displayed on top of which, if they overlap.