WM_CONTROL (in Circular Slider Controls) - Parameters

usID (USHORT)

Control-window identity.

The identity of the circular slider that generated the notification.

usnotifycode (USHORT)

Notification code.

The notification codes that indicate what action has occurred.

CSN_SETFOCUS

This code returns a Boolean indicating whether the circular slider control sending the notification message is gaining or losing the focus.

param2 contains TRUE if the control is gaining the focus.

CSN_CHANGED
This code is sent to notify the application that the circular slider value has been changed.

param2 contains the new value of the circular slider.

CSN_TRACKING
This code is sent to notify the application that the circular slider is being tracked by the mouse.

param2 contain the inter-media value of the circular slider.

Inter-media values are not necessarily contiguous.

CSN_QUERYBACKGROUNDCOLOR
This code gives the application the opportunity to set the background color of the circular slider. CLR_* or SYSCLR_* values can be returned for the background color.

param2 is NULL.

ulnotifyspec (ULONG)

Notify control-specific information.

ulReserved (ULONG)

Reserved value.

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