Custom Draw items inside a ListView Control

WEBINAR: On-demand webcast

How to Boost Database Development Productivity on Linux, Docker, and Kubernetes with Microsoft SQL Server 2017 REGISTER >

If you do not want to go through the hassle implementing OwnerDraw list controls, where you got to code a bunch of stuff inside the DrawItem override, then you can use the CustomDraw handler. With version 4.70 of the Comctrl.dll, you can handle row data, but with the 4.72+ version of the Dll, you can handle cell data. Which opens a lot of possibilities.

Here I present some examples on how to use the CustomDraw message.

Note: Similar handling is also possible for the other common controls.

Add the following to your CListCtrl derived class header file:


afx_msg void OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult);

// add the following to your message map in the cpp file.
ON_NOTIFY_REFLECT(NM_CUSTOMDRAW, OnCustomDraw)

// add the following function to the cpp file.
// for specialized row handling.
// modify to suit.  (in this sample function, I color every alternate row).
void CListCtrlEx::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult)
{
 //for this notification, the structure is actually a
 // NMLVCUSTOMDRAW that tells you what's going on with the custom
 // draw action. So, we'll need to cast the generic pNMHDR pointer.
 LPNMLVCUSTOMDRAW  lplvcd = (LPNMLVCUSTOMDRAW)pNMHDR;

 switch(lplvcd->nmcd.dwDrawStage)
 {
  case CDDS_PREPAINT:
   *pResult = CDRF_NOTIFYITEMDRAW;          // ask for item notifications.
  break;

  case CDDS_ITEMPREPAINT:
   *pResult = CDRF_DODEFAULT;

   int iRow = lplvcd->nmcd.dwItemSpec;
   if(iRow & 1)
   {
    lplvcd->clrTextBk = RGB(255, 0, 0);
    lplvcd->clrText = RGB(255, 255, 0);
    *pResult = CDRF_NEWFONT;
   }
  break;

  default:
   *pResult = CDRF_DODEFAULT;
 }
}

// add the following function to the cpp file.
// for specialized cell handling.
// modify to suit. (in this sample function, I color every alternate cell).
void CListCtrlEx::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult)
{
 //for this notification, the structure is actually a
 // NMLVCUSTOMDRAW that tells you what's going on with the custom
 // draw action. So, we'll need to cast the generic pNMHDR pointer.
 LPNMLVCUSTOMDRAW  lplvcd = (LPNMLVCUSTOMDRAW)pNMHDR;

 switch(lplvcd->nmcd.dwDrawStage)
 {
  case CDDS_PREPAINT:
   *pResult = CDRF_NOTIFYSUBITEMDRAW;          // ask for subitem notifications.
  break;

  case CDDS_ITEMPREPAINT:
   *pResult = CDRF_NOTIFYSUBITEMDRAW;          // ask for subitem notifications.
  break;

  case CDDS_ITEMPREPAINT|CDDS_SUBITEM: // recd when CDRF_NOTIFYSUBITEMDRAW is returned in
  {                                    // response to CDDS_ITEMPREPAINT.
   *pResult = CDRF_DODEFAULT;

   int iCol = lplvcd->iSubItem;
   int iRow = lplvcd->nmcd.dwItemSpec;

   if((iRow & 1) && (iCol & 1))
   {
    lplvcd->clrTextBk = RGB(255, 0, 0);
    lplvcd->clrText = RGB(255, 255, 0);
    *pResult = CDRF_NEWFONT;
   }
  break;
  }

  default:// it wasn't a notification that was interesting to us.
   *pResult = CDRF_DODEFAULT;
  }
 }

// add the following function to the cpp file.
// for specialized cell handling.
// modify to suit.
// (in this sample function, I color every alternate cell,
// if the checkbox style is not present, otherwise, I color all checked rows).
void CListCtrlEx::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult)
{
 //for this notification, the structure is actually a
 // NMLVCUSTOMDRAW that tells you what's going on with the custom
 // draw action. So, we'll need to cast the generic pNMHDR pointer.
 LPNMLVCUSTOMDRAW  lplvcd = (LPNMLVCUSTOMDRAW)pNMHDR;

 switch(lplvcd->nmcd.dwDrawStage)
 {
  case CDDS_PREPAINT:
   *pResult = CDRF_NOTIFYSUBITEMDRAW;          // ask for subitem notifications.
  break;

  case CDDS_ITEMPREPAINT:
   *pResult = CDRF_NOTIFYSUBITEMDRAW;          // ask for subitem notifications.

   if(GetExtendedStyle() & LVS_EX_CHECKBOXES)  // if we have a checkbox style,
   {                                           // forget about subitem notifications.
    *pResult = CDRF_DODEFAULT; 

    int iRow = lplvcd->nmcd.dwItemSpec;
    if(GetCheck(iRow))                      // highlight checked rows
    {
     lplvcd->clrTextBk = RGB(255, 0, 0);
     lplvcd->clrText = RGB(255, 255, 0);
     *pResult = CDRF_NEWFONT;
    }
   }
  break;

  case CDDS_ITEMPREPAINT|CDDS_SUBITEM: // recd when CDRF_NOTIFYSUBITEMDRAW is returned in
  {                                    // response to CDDS_ITEMPREPAINT.
   *pResult = CDRF_DODEFAULT;

   int iCol = lplvcd->iSubItem;
   int iRow = lplvcd->nmcd.dwItemSpec;

   if((iRow & 1) && (iCol & 1))
   {
    lplvcd->clrTextBk = RGB(255, 0, 0);
    lplvcd->clrText = RGB(255, 255, 0);
    *pResult = CDRF_NEWFONT;
   }
  break;
  }

  default:// it wasn't a notification that was interesting to us.
   *pResult = CDRF_DODEFAULT;
 }
}

// add the following function to the cpp file.
// for specialized cell handling.
// modify to suit.
// (in this sample function, I display the text centered).
void CListCtrlEx::OnCustomDraw(NMHDR* pNMHDR, LRESULT* pResult)
{
 //for this notification, the structure is actually a
 // NMLVCUSTOMDRAW that tells you what's going on with the custom
 // draw action. So, we'll need to cast the generic pNMHDR pointer.
 LPNMLVCUSTOMDRAW  lplvcd = (LPNMLVCUSTOMDRAW)pNMHDR;

 switch(lplvcd->nmcd.dwDrawStage)
 {
  case CDDS_PREPAINT:
   *pResult = CDRF_NOTIFYSUBITEMDRAW;          // ask for subitem notifications.
  break;

  case CDDS_ITEMPREPAINT:
   *pResult = CDRF_NOTIFYSUBITEMDRAW;
  break;

  case CDDS_ITEMPREPAINT|CDDS_SUBITEM:
  {
   int iCol = lplvcd->iSubItem;
   int iRow = lplvcd->nmcd.dwItemSpec;
   CString sItem = GetItemText(iRow, iCol);
   CRect rc;
   GetCellRect(iRow, iCol, LVIR_BOUNDS, rc);

   // get the device context.
   CDC *pDC= CDC::FromHandle(lplvcd->nmcd.hdc);

   // paint the text centered.
   pDC->DrawText(sItem , rc, DT_CENTER);

   *pResult= CDRF_SKIPDEFAULT;
   break;
  }

  default:// it wasn't a notification that was interesting to us.
   *pResult = CDRF_DODEFAULT;
 }
}
Where GetCellRect is defined as follows:

BOOL CListCtrlEx::GetCellRect(int iRow, int iCol, int nArea, CRect &rect)
{
 if(iCol)
  return GetSubItemRect(iRow, iCol, nArea, rect);

 if(GetColumnCount()== 1)
  return GetItemRect(iRow, rect, nArea);

 iCol = 1;
 CRect rCol1;
 if(!GetSubItemRect(iRow, iCol, nArea, rCol1))
  return FALSE;

 if(!GetItemRect(iRow, rect, nArea))
  return FALSE;

 rect.right = rCol1.left;

 return TRUE;
}

History



Comments

  • Very Helpful

    Posted by Atul Shah on 11/08/2015 02:48am

    This is a fantastic and simple solution for custom draw......Excellent regards Atul Shah

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • MongoDB has the flexibility, adaptability and extensibility to embrace widely varying data types and rapid design/deployment cycles. Combining MongoDB with our 5100 ECO Enterprise SSD brings amazing results in smaller, simpler deployments compared to legacy storage. In this technical brief, we compare two MongoDB test clusters, each using the Linux Logical Volume Manager (LVM) for RAID configuration: 5100 ECO 3-node cluster: Two Micron 5100 ECO (1.92TB) per node configured as a software RAID 0 (LVM) Legacy …

  • Many enterprises are working with an IT architecture that's evolved over time. As business needs evolve, IT must decide whether to modernize incrementally, or all at once. Each approach has its benefits and drawbacks. Identity Management is key to modernizing IT; it plays a crucial role in migrating to cloud apps like Office 365 or HR information systems, building web and mobile apps, and opening developer access to business systems. Read how Okta's modern approach to identity management helps business lower …

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date