| Button Events question [message #40860] |
Tue, 14 September 2004 14:44  |
jeff.patrick
Messages: 4
Registered: June 2004
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Junior Member |
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I have a program that uses a number or radio buttons to get numeric
data. I don't need the buttons to respond to any events, but every
time I click on them an event error is generated in the IDL 5.3
programming environment. The event basically says that it could not
find the event handler. Everything works fine I just find these event
error annoying. Is there something I can set in the following line
that will suppress these errors or prevent the button group from
generating an event?
widFileType = CW_BGROUP(widSetupDataTLB, ['Delta', 'dB'], UNAME =
'widMapView', LABEL_LEFT = 'Input File Type :', /NO_RELEASE,
/EXCLUSIVE, /ROW )
Thanks in advance,
Jeff
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| Re: Button Events question [message #41046 is a reply to message #40860] |
Wed, 15 September 2004 10:55  |
Benjamin Hornberger
Messages: 258
Registered: March 2004
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Senior Member |
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By the way, if you had any other event handler above your cw_bgroup in
the widget hierarchy (and you didn't specify event_func), your cw_bgroup
events would be caught by that event handler. You could then use
event.id, or the user value, or something else, to identify that the
event comes from the cw_bgroup and just do nothing. That would also
suppress the error message.
Benjamin Hornberger wrote:
> I had the same annoying problem. A solution is to set the event handler
> for cw_bgroup (event_func='widFileType_event') and to write a function
>
> FUNCTION widFileType_event, event
>
> return, 0
>
> END
>
> cw_bgroup will always create events, that's the way it is written. The
> reason why the above works is that if you specify an event *function*
> (as opposed to an event procedure), IDL will call that function and
> inspect the return value. If the return value is a valid event structure
> (a structure with the fields ID, TOP and HANDLER), it will take that
> return value and move up the widget hierarchy until it finds another
> event handler, to which it passes that structure. If the return value is
> not a valid event structure (like above, where we return zero), it is
> discarded and no further events are generated.
>
> This mechanism gets important when you want to write compound widgets
> for which you want to allow their own event procedures or functions. For
> further details, read "Widget Event Processing" in the IDL help.
>
> Good luck,
> Benjamin
>
>
>
> Jeff Patrick wrote:
>
>> I have a program that uses a number or radio buttons to get numeric
>> data. I don't need the buttons to respond to any events, but every
>> time I click on them an event error is generated in the IDL 5.3
>> programming environment. The event basically says that it could not
>> find the event handler. Everything works fine I just find these event
>> error annoying. Is there something I can set in the following line
>> that will suppress these errors or prevent the button group from
>> generating an event?
>>
>> widFileType = CW_BGROUP(widSetupDataTLB, ['Delta', 'dB'], UNAME =
>> 'widMapView', LABEL_LEFT = 'Input File Type :', /NO_RELEASE,
>> /EXCLUSIVE, /ROW )
>>
>> Thanks in advance,
>>
>> Jeff
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| Re: Button Events question [message #41048 is a reply to message #40860] |
Wed, 15 September 2004 10:45 |
Benjamin Hornberger
Messages: 258
Registered: March 2004
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Senior Member |
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I had the same annoying problem. A solution is to set the event handler
for cw_bgroup (event_func='widFileType_event') and to write a function
FUNCTION widFileType_event, event
return, 0
END
cw_bgroup will always create events, that's the way it is written. The
reason why the above works is that if you specify an event *function*
(as opposed to an event procedure), IDL will call that function and
inspect the return value. If the return value is a valid event structure
(a structure with the fields ID, TOP and HANDLER), it will take that
return value and move up the widget hierarchy until it finds another
event handler, to which it passes that structure. If the return value is
not a valid event structure (like above, where we return zero), it is
discarded and no further events are generated.
This mechanism gets important when you want to write compound widgets
for which you want to allow their own event procedures or functions. For
further details, read "Widget Event Processing" in the IDL help.
Good luck,
Benjamin
Jeff Patrick wrote:
> I have a program that uses a number or radio buttons to get numeric
> data. I don't need the buttons to respond to any events, but every
> time I click on them an event error is generated in the IDL 5.3
> programming environment. The event basically says that it could not
> find the event handler. Everything works fine I just find these event
> error annoying. Is there something I can set in the following line
> that will suppress these errors or prevent the button group from
> generating an event?
>
> widFileType = CW_BGROUP(widSetupDataTLB, ['Delta', 'dB'], UNAME =
> 'widMapView', LABEL_LEFT = 'Input File Type :', /NO_RELEASE,
> /EXCLUSIVE, /ROW )
>
> Thanks in advance,
>
> Jeff
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