Move - worked example

key : purple - original code / blue - new code

Step 1 :

Continue with the program names - simpy edit the previous code.

Step 2 :

Add back and forward buttons to the FormView. The following code within the handler functions should be added :

void CFormNameView::OnBack()
{

((CNamesDoc*)m_pDocument)->MoveCurrentBack();

}

void CFormNameView::OnForward()
{

((CNamesDoc*)m_pDocument)->MoveCurrentForward();

}

Step 3 :

Add MoveCurrentBack() and MoveCurrentForward() functions to the Document class, (these should have public access) :

void CNamesDoc::MoveCurrentBack()
{

if( !m_NameList.IsEmpty() )
{

m_NameList.GetPrev(m_nCurrentPosition);
if( m_nCurrentPosition == NULL )
{

AfxMessageBox("End of list reached");
m_nCurrentPosition = m_NameList.GetHeadPosition();

}
CName * pCurrentName = m_NameList.GetAt(m_nCurrentPosition);
UpdateAllViews(NULL,HINT_CURRENT_NAME,pCurrentName);

}

}

void CNamesDoc::MoveCurrentForward()
{

if( !m_NameList.IsEmpty() )
{

m_NameList.GetNext(m_nCurrentPosition);
if( m_nCurrentPosition == NULL )
{

AfxMessageBox("End of list reached");
m_nCurrentPosition = m_NameList.GetTailPosition();

}
CName * pCurrentName = m_NameList.GetAt(m_nCurrentPosition);
UpdateAllViews(NULL,HINT_CURRENT_NAME,pCurrentName);

}

}

Step 4:

Define the hint within the Document's header :

#include <afxtempl.h>
#include "Name.h"

const int HINT_CURRENT_NAME = 1;

Step 5:

Edit the OnDraw() code within the standard view to allow the current item to be displayed in a different colour :

while(pos!=NULL)
{

CName * pName = ((CNamesDoc*)m_pDocument)->GetNextItem(pos);

// to change the colour of the current item
if( pName == ((CNamesDoc*)m_pDocument)->GetCurrentItem() )
{

pDC->SetTextColor(RGB(200, 0, 0));

}

pDC->TextOut(ptText.x, ptText.y, pName->GetFullName());
ptText.y += nLineHeight;

// to change back the previous items to black
pDC->SetTextColor(RGB(0, 0, 0));

}

Click here for the basic exercise

Click here for the source code

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