TRACK_BAR

TRACK_BAR N

CREATES A SYSTEM OBJECT TRACK_BAR AND ALLOCATES IT NUMBER N AS REFERENCE

  • Type: Command
  • Parameter: 1
  • Group: System Objects Creation

ACTION

The command TRACK_BAR N creates a system object TRACK_BAR, and allocates it a number N. The number N will be used to designate the TRACK_BAR.

The created TRACK_BAR can then be used through the appropriated commands.

The TRACK_BAR is created at position (0,0) : that is TOP = 0 pixel and LEFT = 0 pixel, with dimensions WIDTH = 150 pixels and HEIGHT = 45 pixels.

A TRACK_BAR displays a slider with tick markers. The slider can be positioned by the command POSITION N,P and its position can be read by the function POSITION(N).

A TRACK_BAR can generate the event : ON_CHANGE.

Remark: by default, the TRACK_BAR is created on the FORM number 0, but another FORM can be used. For that, create a FORM by FORM N, and send it all the commands by COMMAND_TARGET_IS N before creating the TRACK_BAR.

SYNTAX: TRACK_BAR N

  • N = system object number (integer or real). Must be greater than 0 and less than or equal to the allowed maximum number of system objects.

USE

  • A TRACK_BAR is used to display a slider with tick markers. The slider can be positioned by the command POSITION and its position can be read by the function POSITION().

ERROR

  • If number N is not a correct expression.
  • If number N exceeds the allowed maximum number of system objects.
  • If number N is less than or equal to 0.
  • If number N is already used for a system object number.

EXAMPLE

rem create a TRACK_BAR with default position and dimensions

track_bar 1

SEE ALSO

TOP

LEFT

VERTICAL

HORIZONTAL

WIDTH

HEIGHT

HINT

HINT_HIDE

FULL_SPACE

MIN

MAX

POSITION

POSITION()

ON_CHANGE