Validating Changes in a Dialog

The cChangeValidate class is a useful tool for validating changes that a user may or may not have made
to a dialog. For example, take for instance that a user pops up a dialog that has 3 buttons and an edit box.
All 3 buttons are checked, and there is no text in the edit box. If the user does not uncheck ANY of the check boxes
AND does not put any text into the edit box, they have in effect made no changes. Now when they press OK (or whichever
button performs processing), if you were doing a whole bunch of processing from the root app (such as database calls, updates
to activity logs, etc….) that aren’t necessary because you have in effect not made any changes, why do it?

cChangeValidate is extremely easy to implement and use. It was written in a very basic form, and anyone should be
able to incorporate it into their project with a minimum of difficulty. Note: cChangeValidate only stores the data for
Combo Boxes, Edits, Buttons, and List Controls. If you wish to store data for say Static text or a specific class, just
add another check in the cChangeValidate CALLBACK functions for your class and perform data storage and checking as necessary.
Below is some sample code to actually run the class.

void Foo::Init()
{
 // cChangeValidateClass is a member variable of whichever class 
 // wants to use it. It must be global in scope and not local 
 // otherwise you obviously would not be able to store the data 
 // for later use
 cChangeValidateClass.CycleControls( GetSafeHwnd());
 return;
}
void Foo::OnOK()
{
 if( cChangeValidateClass.Compare())
 {
  //data has not been changed
  OnCancel(); 	//Or whichever process you wish to perform
  return;
 }
 //If data has been changed continue with processing
}

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