Using "Button" from Toolbox in Vector Panel Designer, for a CAPL

Question

I am writing testcases in CAPL and want to activate each test case by using "Button" from Panel Designer. The problem is that whenever I pressed the Button, it reacted as if it were pressed twice.

I just simply add a code like this to make that problem visible. (The system variable of "@sysvar::Test_Cases::TC1" is linked to the Button in the Panel Editor)

on sysvar sysvar::Test_Cases::TC1  
{
    putValueToControl("Window","CAPL Output View",@sysvar::Test_Cases::TC1);
}

I expect to see only --> Value of @sysvar::Test_Cases::TC1 =1

But the output is like this:

Value of @sysvar::Test_Cases::TC1 =1 Value of @sysvar::Test_Cases::TC1 =0

Answer 1

on sysvar X{...} event procedure reacts to value change of X.So in case of button press (0->1) value will be set to one then on button release (1->0) value will be set to zero, so you change the value of X twice. This is why you are getting trigger twice.

To react only once on such button press event, and get notification only once, please use the keyword this and condition statement.

on sysvar sysvar::Test_Cases::TC1  
{
    if (this==1) /* Following block is called only once, on button press 0->1 */
    {
     putValueToControl("Window","CAPL Output View",@sysvar::Test_Cases::TC1);
    }
}