Visual C++ and MFC Programming 2nd Edition

Chapter 17: Track-Based Controls Visual C++ and MFC Fundamentals

UpClick() event. On the other hand, when the user clicks the down pointing arrow

button, the control sends a DownClick() event. These allow you to treat each event

separately if you want.

If you are more interested in the value of the UpDown control, when the user clicks either

of its buttons, the value of the control changes. Once the value of the control has been

modified, it fires a Change() event.

The UpDown control provides bonus events related to the mouse. When the mouse

arrives to passes over this control, the MouseMove() event is fired. If the user presses a

mouse button on the control. It fires the MouseDown() event. When the user releases the

mouse button, the MouseUp() event is fired.

Practical Learning: Configuring an UpDown Control

1. If you are using MSVC 6, display the ClassWizard and the Message Maps property
   page. Click the IDC_QUANTITY. In the Messages section, double-click Change,
   click OK and click Edit Code
   If you are using MSVC 7, display the dialog box and click the UpDown control. On

the Property window, click the Control Events button. Click the arrow of the

Change combo box and select the only item in the list

2. Implement the event as follows:

void CCDPublisherDlg::OnChangeQuantity()

{

// TODO: Add your control notification handler code here

int Quantity;

double UnitPrice, TotalPrice;

Quantity = m_Quantity.GetValue();

if( Quantity < 20 )

UnitPrice = 20;

else if( Quantity < 50 )

UnitPrice = 15;

else if( Quantity < 100 )

UnitPrice = 12;

else if( Quantity < 500 )

UnitPrice = 8;

else

UnitPrice = 5;

TotalPrice = Quantity * UnitPrice;

m_EditQuantity.Format("%d", Quantity);

m_UnitPrice.Format("$%.2f", UnitPrice);

m_TotalPrice.Format("$%.2f", TotalPrice);

UpdateData(FALSE);

}

3. Test the application