ACTIVATE LISTVIEW

PLBCMP GUI Only

The ACTIVATE LISTVIEW statement makes a LISTVIEW visible and allows the user to interact with it. An optional execution label may be provided to process information if the user selects the LISTVIEW. The instruction uses the following format:

Where:

label

Optional. A

listview

Required. The name of a previously created LISTVIEW object variable or a pointer to a LISTVIEW object.

routine

Optional. A program execution label called when a mouse click occurs within the screen boundaries of the object.

result

Optional. A previously defined Numeric Variable in which the result code as described below is placed upon object selection.

Flags Affected: NONE

Note the following:

1. If the {routine} and {result} operands are not provided, the runtime performs a default action of setting the LISTVIEW to the selected item.

2. If the {result} operand is specified, it is set to the item number whose focus changed.

3. If the {result} operand is too small to contain the value, the OVER flag is set upon entry to the {routine}. This flag setting does not occur at the time of the ACTIVATE but at the time the {routine} is called.

4. The {routine} is called when a mouse click occurs within the screen boundaries of the LISTVIEW.

5. The {routine} is called as if a CALL instruction was performed. It is only called when an EVENTCHECK or EVENTWAIT is executed.

6. When the {routine} is complete, a RETURN instruction continues execution at the instruction following the EVENTWAIT or EVENTCHECK. Otherwise, a NORETURN instruction should be executed to clear the return address from the call stack.

7. If the LISTVIEW specified by an ACTIVATE instruction is already active, the old {routine} and {result} operands are replaced with the new {routine} and {result} operands.

8. An object must be CREATEd before it is activated. If this is not done, a runtime error of O105 is generated.

9. If insufficient memory is available to perform the operation, a runtime error O106 is generated.

10. If a FILEPI instruction is active, it is terminated.

See Also: Example Code, ACTIVATE, DEACTIVATE, Object Output Instructions