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Enabling buttons in dialog box

Enabling buttons in dialog box

Enabling buttons in dialog box

(OP)
If I have several radio buttons, can I enable or disable a command button depending on which radio button is clicked?  For example, if 3 radio buttons in a group are labeled WHITE, BLACK, and GRAY, can I enable a command button on the same dialog only if WHITE or BLACK are checked, but not GRAY?  I thought of using an ON_UPDATE_COMMAND_UI macro, with the handler function containing an "if" statement checking the variables mapped to the radio controls, but I think DoDataExchange doesn't get called yet to set the values.  Any other ideas how I can dynamically handle the state of a button (or edit box, etc) according to selections made by the user?

RE: Enabling buttons in dialog box

I would make a private boolean variable that I could toggle depending on which button the user pressed.  And then enable or disenable the buttons depending on the state of the boolean.

RE: Enabling buttons in dialog box

(OP)
Thanks for your quick reply.  I'm afraid I'm still not getting it...how does that private boolean variable get set in a modal dialog if nothing else has been clicked.  I am hoping to enable/disable a button before "OK" or "Cancel" are clicked.  The answer might be right in front of my eyes, but I am just not seeing it.

RE: Enabling buttons in dialog box

Dear DoctorC,

If I understand your stated problem correctly, try this:

Open Class Wizard and select the 'Member Variables' tab. You should see a single entry for all the radio buttons with the Control ID of the first in the group. Create a member variable for that control, say you name it ( _nRadio).

Now create a 'Control' type variable for each of the 'Buttons' you want to enable/disable say there are two and you name the variables '_btnOne' and '_btnTwo'.

Now click the 'Message Map' tab on the Wizard dialog. Create a handler for each radio button Control's BN_CLICKED messsage. Now click 'OK'.

Now create a member function for your dialog say you call it 'onRadio' so the function body looks like this:

void MyDialog::onRadio(){
}

Now in each of the 'BN_CLICK' handlers for the radio controls add a call to 'onRadio()'.

Now add this code to the 'onRadio' function of course changing it in such a way that it generates your desired behavior.

UpdateData();
switch( _nRadio){
case 0:
_btnOne.EnableWindow( FALSE);
_btnTwo.EnableWindow( TRUE);
break;
case 1:
_btnOne.EnableWindow( TRUE);
_btnTwo.EnableWindow( FALSE);
break;
case 2:
_btnOne.EnableWindow( TRUE);
_btnTwo.EnableWindow( TRUE);
break;
}


Hope this helps
-pete

RE: Enabling buttons in dialog box

(OP)
Thanks Pete

I haven't tried it yet, but your suggestion sounds right on.  If you don't see another response here from me, you can assume it worked.  Thanks again

Dr.C

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