OperateSplitter does not control recall

The online help for SP1 CVI2009 OperateSplitter () said:

  • Use this function to mimic the movement of a splitter of the interactive user control.

Unfortunately, this is not quite true:

If the separator is a point of order, this reminder is executed when the separator is moved with a drag of the mouse, but is not executed when the separator is moved by (OperateSplitter)

It is easy to see that by running the provided example \CVI2009\samples\userint\events.cws, adding

OperateSplitter(panel, PANEL_SPLITTER, width - gPanelWidth);

line 159 of the events.c

When you resize the Panel, you can see that the PANEL_SPLITTER callback is not called.

When you move the separator, even with the mouse, the callback is called.

Is this expected behavior?

As has been pointed out, the events are not usually sent following a programmatic action. The recall and the events are there to let the programmer to react to the * user * actions. When the programmer initiates the action, an event letting you know that the action took place, since you launched it is necessary.

In this case, you could do all that the recall made after the call to OperateSplitter (or call the callback yourself).

OperateSplitter exists so that all controls set to the separator will be size or moved as if the user ran the separator, as opposed to simply by changing the position of the separator (which is how SetCtrlAttribute with ATTR_LEFT or ATTR_TOP).

Hope this helps,

-jared

Tags: NI Software

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