Default constructor.

Developers should use the other constructor overload instead.

C++ constructor with a connected window server session.

Construct() must be called to complete construction.

Indicates to the window server that you have finished performing direct screen access.

Calls Completed() then deletes the server side resource and sets the client's handle to it to NULL.

Indicates to the window server that you have responded to the completion of the request status passed to Request() , by stopping direct screen access.

Second phase constructor.

Creates the server side resource and initialises the client's handle to it.

This function always causes a flush of the window server buffer.

Second phase constructor. This is not supported in WSERV non NGA. It's available just when NGA is present.

Issues a request to the window server for permission to perform direct screen access on a window.

Direct access to the screen may be refused due to lack of memory or if the target window is completely obscured.

If direct access is allowed, the function passes back a clipping region which is the part of the screen the caller can draw to.

When direct screen access must stop, for instance because a dialog is to be displayed in front of the region where direct screen access is taking place, the window server completes the request. The recommended way to check for this is for aStatus to be the request status of an active object that will be run when the request completes, i.e. if Request() returns KErrNone, call SetActive(), and in the object's RunL(), you should immediately abort direct screen access.

While the DSA is in operation, it is strongly advised that the client should not make any call to WSERV that will affect the visible area of the window in which the DSA is taking place.

When WSERV tells the client that it needs to abort its DSA, it waits to receive the acknowledgment from the client that it has done so. However, it doesn't wait for ever, since the client may have entered some long running calculation or even an infinite loop. So WSERV also waits on a timer: if the timer expires before the client acknowledges, then WSERV continues; if, later on, WSERV gets notification from the client that it has aborted the DSA, then WSERV will invalidate the region in which the DSA was taking place, just in case there had been a conflict between the DSA and another client.

This function always causes a flush of the window server buffer.

The priority of the active object that responds to notification that direct screen access must stop.

Provides the reason why direct screen access must terminate. This enum is used in the MAbortDirectScreenAccess::AbortNow() and MDirectScreenAccess::Restart() functions.

The first value (ETerminateCancel) indicates that direct screen access is being terminated by the application. The final three values indicate that direct screen access is being terminated by the window server. Note that for users of CDirectScreenAccess , the termination code is not important because these issues are dealt with by CDirectScreenAccess::StartL() .