Impossible to completely disable a command grayed out button

Hello! Everyone,

I thought that this matter has been resolved before, but it back once again.

Please take a look at the code in the attached draft.

If the call to "Delay (5)" is placed after "ProcessSystemEvents()" called in the A_Callback() function, B - LEDs always do anything!

Shading or make invisible B button is not disable the command button at all.

Only when I placed the call "Delay (5) ' before the 'ProcessSystemEvents()', the B button will be disabled.

Just by dimming button B, without "ProcessDrawEvents()" and "ProcessSystemEvents()", will not ensure that the button is disabled.

I'm puzzled.  What is the proper way to completely disable a command button?

This problem occurs only in 6.0 CVI?

If you need to call ProcessSystemEvents in order to ignore clicks on a button depends on what you are doing at the time when and where you you undim control.  The original question came when the button is gray and more blurred in a callback.

CVI differs from event processing while you're in a callback.  If you're not currently in a reminder, a click event will be processed when it occurs.  If the control is dimmed when the click occurs, (once again, outside of a reminder), the event will be treated and ignored and you need not ProcessSystemEvents.

Or if you dim the control from a reminder, click the control, and then quit the recall without undimming the control, the event will be handled with the dimmed control and will be ignored (without the need of ProcessSystemEvents).

So the big question is when you undim control?  If you the undim the end of a long reminder, then you call ProcessSystemEvents.

But if, for example, you open a panel with a dimmed and then control it undim after something else, you don't need ProcessSystemEvents to ignore the click.

Let's say you have a panel with a control for the user to select a file name and a button to print the selected file.  You don't want to print to be active until the file is selected, so it is dimmed by default initially.  In a callback for file name control, after the user selects a file, you can then undim the print button without the need to call ProcessSystemEvents.  Any click button print previously sifted is already been ignored.

Tags: NI Software

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