How do I trap the enter key in zComboBox (any type, portable solution)?

Article ID: 1025
Last updated: 05 Feb, 2008
Article ID: 1025
Last updated: 05 Feb, 2008
Revision: 1
Views: 3880
Posted: 30 Jan, 1998
by Dean J.
Updated: 05 Feb, 2008
by Dean J.
Problem


Trap the enter key in any zComboBox (portable solution).


Cause


Pressing the enter key needs to react the same as pressing a go button.


Action


//============================================================================
// Code from sample app that traps enter key in ANY zComboBox
// Also: is portable.
// 1. zFactory  - put zComboBoxFull (or any other) on dialog
// 2. Choose source code for setFocus and killFocus events.
// 3. Generate code - add the following (total 15 lines).
//============================================================================
// How it works:
// Enter is an accelerator for OK button
// Intercept the message when the OK button is pressed (setCommand)
// Find out who had the focus last
//    If Combobox has focus: Enter key must have been pressed.
//    If OK button has focus: OK button was pressed.
//============================================================================
// In HPP file: (Note all code not marked by //<============== is factory
// generated).
 

class DDialog2 : public zFormDialog {
 zEditLine *pEdit1, *pEdit2;
 zComboBoxBase *pComboBox2;
 zButton *pOK, *pButton1;

public:
 zString _Edit1, _Edit2;
 zString _ComboBox2;
 DDialog2(zWindow *, const zResId&);
 int setFocusComboBox2(zFocusEvt*);
 int killFocusComboBox2(zFocusEvt*);

 // zpb_begin DDialog2Class
        int cmdIDOK ( zCommandEvt*);        //<==============
        BOOL _gotFocus;                     //<==============
 // zpb_end
};

//============================================================================
// In CPP file:
 

DDialog2::DDialog2(zWindow *w,const zResId& rid) : zFormDialog(w,rid) {
 // zpb_begin DDialog2Constructor2
 // zpb_end
 pEdit1 = ZNEW zEditLine(this, ID_EDIT1, &_Edit1, 0);
 pEdit2 = ZNEW zEditLine(this, ID_EDIT2, &_Edit2, 0);
 pComboBox2 = ZNEW zComboBoxFull(this, ID_COMBOBOX2, &_ComboBox2);
 pComboBox2->add(zString(zResId(IDS_DIALOG2COMBOBOX2_1)));
 pComboBox2->add(zString(zResId(IDS_DIALOG2COMBOBOX2_2)));
 pComboBox2->add(zString(zResId(IDS_DIALOG2COMBOBOX2_3)));
 pComboBox2->add(zString(zResId(IDS_DIALOG2COMBOBOX2_4)));
 pComboBox2->setNotifySetFocus(this,
(NotifyProc)(NotifyFocusProc)&DDialog2::setFocusComboBox2);
 pComboBox2->setNotifyKillFocus(this,
(NotifyProc)(NotifyFocusProc)&DDialog2::killFocusComboBox2);
 // zpb_begin DDialog2Constructor
   pOK = ZNEW zDefPushButton(this, IDOK);                       //<=========
   pOK -> setCommand( this, (CommandProc)&DDialog2::cmdIDOK );  //<=========
   _gotFocus = 0;                                               //<=========
 // zpb_end
 show();
}

int DDialog2::setFocusComboBox2(zFocusEvt* ev) {
 // zpb_begin DDialog2setFocusComboBox2
   _gotFocus = 1;                                               //<=========
 // zpb_end
 return 0;
}

int DDialog2::killFocusComboBox2(zFocusEvt* ev) {
 // zpb_begin DDialog2killFocusComboBox2
   _gotFocus = 0;                                               //<=========
 // zpb_end
 return 0;
}

//============================================================================
// This function defined by programmer (not factory)

// zpb_begin DDialog2MemberFunctions
int DDialog2::cmdIDOK ( zCommandEvt*) {
   if( _gotFocus ) {
      _gotFocus = 0;
      //============ do your Enter key processing here =====================
      delete new zMessage( this, Enter key trapped!, MyComboBox, MB_OK );
      return 1;
   }
   return 0;
}
// zpb_end
If you would like to see a different solution for strictly for MOTIF/UNIX environments click here

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Article ID: 1025
Last updated: 05 Feb, 2008
Revision: 1
Views: 3880
Posted: 30 Jan, 1998 by Dean J.
Updated: 05 Feb, 2008 by Dean J.

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