Avoiding Thumb Tracking Messages

You might not want to respond to the scroll bar notification messages while the user is dragging the scroll bar's thumb, because the user is usually dragging the thumb quickly, generating many notification messages.

It is more efficient to wait until the user has stopped moving the thumb and then respond. To do this, screen out the notification messages that have the SB_THUMBTRACK code.

See Also

• Using Scroll Bars
• Specializing Scroll Bar Behavior