| Re: Widget text [message #43181 is a reply to message #37766] |
Fri, 18 March 2005 00:02  |
Antonio Santiago
Messages: 201
Registered: February 2004
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Senior Member |
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CSUIDL PROGRAMMEr wrote:
> HI i am learning Widget IDL programming
> I want to know, how to process text fro Widget _ text such that when
> user enters text and presses submit button action is taken. How to pass
> text to button event handler
>
The best thing you can do is saw a simple example IDL code or a library
utility.
When your widget is relatively simple, normaly assigns an structure with
all needed information to the UVALUE of the main widget_base.
info = { text: your_widget_text, button: your_widget_button}
WIDGET_CONTROL, base, SET_UVALUE=info
Also you need to "call" your widget_text and widget_button assing an
string into their UVALU:
WIDGET_CONMTRL, you_text, SE_UVALUE='TEXT'
WIDGET_CONTROL, your_button, SET_UVALUY='BUTTON'
Also, you register an event_handler to handle all the events on the main
widget_base. Get the event.id, get its UVALUE (and get the UVALUE from
event.top, that is the main widget):
PRO event_handler, event
WIDGET_CONTROL, event.id, GET_UVALUE=uval
WIDGET_CONTROL, event.top, GET_UVALUE=info
CASE uval OF
'TEXT': print, 'event on widget_text'
'BUTTON': BEGIN
print, ' event on button'
WIDGET_CONTROL, info.text, GET_VALUE=string
print, 'your text is' + string
END
END
More or less these are the steps.
Another method is to asign to button's UVALUE the widget_text. Creates
the button with EVENT_PROC:
button = WIDGET_BUTTON(VALUE='ok', UVALUE=your_widget_text,
EVENT_PROC=my_proc)
PRO my_proc, event
WIDGET_CONTROL, event.id, GET_UVALUE=text
WIDGET_CONTROL, text, GET_VALUE=string
print, string
END
Bye,
Antonio.
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