Windows and panes

The display layouts are hierarchically organized. The layouts are built using components called windows and panes.

**Table:** Windows and panes
Window / Pane	Description
Screen	The screen is the topmost display component, corresponding to the entire pixel area of the physical screen.
Window	A window is a component that has no parent except the screen. Typically, a window fills up the entire screen, but there are also smaller (temporary) windows that take up only a part of the screen, leaving other parts of the screen visible around themselves. Each application runs in a window of its own. Applications can also use other temporary windows.
Pane	A pane is a subcomponent of a window. A window may contain several panes, and each pane may contain further sub-panes and so on. A bottom level component that cannot have a sub-component can be called an element.
Application window	An application window is a main window filling up the entire screen. It is usually not used directly for display, but just as a parent for the various panes. A typical application window is divided into the following panes: Status pane Main pane Control pane See Main pane , Status pane and Control pane for more detailed descriptions on each of these panes.
Pop-up window	A pop-up window must not fill the entire screen; the pop-up window has a frame, and typically the underlying application is partly visible around the pop-up window. Pop-up windows are typically used in temporary states. Back stepping should not usually lead to a pop-up window. Detailed information on the various pop-up windows can be found in Pop-up windows.

Figure: Panes

Windows and panes use the Symbian application and UI frameworks. For implementation information, see Application and UI framework implementation considerations.

Main pane
Status pane
Control pane
Scrollbars
Layout changes in bi-directional languages
Pop-up windows
Zooming
Zooming actions
Mobile device users must be able to zoom in and out consistently within applications on a mobile device. However the zooming actions may differ from one device model to another.
Zooming feedback
Zooming should occur instantaneously, so that seeing the content change size provides mobile device users with all the feedback they need. Therefore, a zoom indicator is usually not needed.