Objective Toolkit : Chapter 18 View Classes : Zoom Modes
Zoom Modes
The following flags, when set with SetZoomMode(), control how the view is displayed.
Table 45 – Zoom mode flags 
Zoom mode flag
Description
SEC_ZOOMOFF
No zooming. Use this if you want to turn off zooming. This is the default mode.
SEC_ZOOMNORMAL
Enables normal zoom mode. In this mode, specify either a zoom rectangle or a zoom percentage to control zooming.
SEC_ZOOMFIT
Enables zoom to fit mode. The view is automatically zoomed to fit inside the client area so that no scrabblers are needed.
SECPanView supports two modes of operation that determine how the view is updated when the user moves the view with the mouse. The modes listed below can be selected with SetPanMode().
Table 46 – Pan Modes 
Pan mode flag
Description
SEC_PANDELAY
The view is updated only after the user completes the move and releases the mouse button.
SEC_PANINSTANT
The view is updated instantly for every movement of the mouse.