Tutorial 5

Input/Output GUI Elements

1. Drag a Check Box to the dialog window, inside the Properties window, change
   1. ID to "IDC_TIMER_CONTROL_SLIDERS"
   2. Caption to "Timer Control Sliders"
   3. Auto to True
2. Add an output Control Variable to the "Timer Control Sliders" text box, with
   1. Access to private
   2. Category to Value
   3. Variable Name to "m_TimerCtrlSliders"
   4. Variable Type to BOOL
3. In 'TutorialDlg.cpp', initialize the boolean inside the OnInitDialog() function:
   BOOL CTutorialDlg::OnInitDialog(){
      ...
      m_TimerCtrlSliders = TRUE;
      UpdateData(FALSE);
   }
4. Add Event Handler to the "Timer Control Sliders" check box, change
   1. Message Type to BN_CLICKED
   2. Class List to CTutorialDlg
   3. Function Handler Name to OnBnClickedTimerControlSliders
   4. Click Add and Edit
5. In 'TutorialDlg.cpp', inside OnBnClickedTimerControlSliders(), add
   void CTutorialDlg::OnBnClickedTimerControlSliders(){
      UpdateData(TRUE);
      // This will fill all UI-connected variables with whatever
      // value that is showing on the UI control objects.
   }

1. In 'TutorialDlg.cpp', inside OnTimer(...), add
   ...
   if (m_TimerCtrlSliders){
      // Get ready to decrease the sliders ...
      int hvalue = m_HSliderBar.GetPos();
      if (hvalue > 0){
        m_HSliderBar.SetPos(hvalue-1);
        m_HSliderEcho.Format("%d", hvalue-1);
      }
      // do the same for the vertical slider
      int vvalue = m_VSliderBar.GetPos();
      ...
      if ( (hvalue==0) && (vvalue==0) ){
        m_TimerCtrlSliders = false;
      }
      ...
   }

• In the Visual Studio project window, click
  1. Build >> Build Solution
  2. Debug >> Start to run
  
  Figure 5.1 - Application Window