 
 subsubsectionstar3_3_2_3.html  subsection3_3_2.html  subsubsection3_3_2_1.html  tableofcontents3_1.html   Next: subsubsectionstar3_3_2_3.html  Disabling Callbacks Temporarily Up: subsection3_3_2.html Getting Started: the  Previous: subsubsection3_3_2_1.html Creating a TixControl    Accessing The Value of a TixControl Widget  
The TixControl widget allows the user to input a value. There are
  several ways to read this value in your program. First of all,
  TixControl stores the current value in the 
-value option.  You
  can use query the 
-value option by calling the command
     .c cget -value
this command will return the current value of the tixContro widget
  
.c.  The following command sets the value of the widget to a
  new number (100):
     .c config -value 100
The second way to access the value of TixControl is to use the 
-variable option. This options instructs the TixControl widget to
  store the its value into a global variable so that you can read it
  at any time. Also, by assigning a new value to this global variable,
  you can change the value of the TixControl widget. Here is an
  example:
     .c config -variable myvar    set myvar 100
   In some situations, you may want to be informed immediately when the
  value of the TixControl widget changes. To accomplish this, you can use
  the 
-command option.  The following line causes the TCL procedure
  
valueChanged to be called whenever the value of .c changes:
     tixControl .c -command valueChanged
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