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On 02/23/2013 03:24 AM, Hal Vaughan wrote:
I have a macro in LO BASIC that sets up a dialog, then, instead of executing it, I do:


This dialog box contains a progress bar and, while testing it, I realized it's frustrating for 
longer documents to have a progress bar and force me to sit and wait without a way to cancel it.  
So I added a Cancel button.

This dialog is in my library and I'd like to find a way to set up the "Cancel" button so it can 
either stop the script or possibly even call a clean up routine when it's been pressed - or have it change 
the state of a global variable so a routine could see if it's been pressed.

I know there are event handlers so I can do something on events like MouseOver and so on.

And if I were not putting this in a library, I could easily specify, in the Dialog Settings, which 
routine to call on Cancel.

But if I want the dialog in a library, is there a way, when calling the function that sets it up, 
to specify a routine to call when the Cancel button is pressed?  Or is there some way to create a 
global variable or any kind of flag that I could have changed when the button is pressed?

In other words, other than putting in a "Stop" command, or specifying one routine name to call when 
an event triggers it, can I pass on the name or pointer to a routine that would be called when the button is 

Disclaimer: I have never tried or considered what you desire to do, but..... I suppose that I would first test this (should be easy to do).

First, what is it that you are doing that you desire to interrupt? Specifically, is it your macro code that is running for a long time, or, did it make a call that is running for a long time? If it is your own macro, I would try setting a global in an event handler and check that global in your code. You could create a quick test

while the "cancel requested global is not true" and two minutes has not elapsed
  do something like add zero to a variable

Print "I am out and finished"

Then, you can check to see if you can set the global variable by clicking on a cancel button and having the event handler be called. I am not optimistic that this will work, but, it is worth a try. I am very interested in your results.

Andrew Pitonyak
My Macro Document:

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