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Posted 5 Mar 2012

Fast Ensure Visible for CGridCtrl

, 5 Mar 2012
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This tip shows a very fast algorithm (with some constraints enforced for it to work) to EnsureVisible a row in CGridCtrl by Chris Maunder


In one of my projects, I had to load around 200000 rows in the CGridCtrl and then had to provide the functionalitiy of EnsureVisible to scroll to and highlight a row. So I had to come up with a reasonably fast algorithm. 

The code

// This function will only work if all the grid control rows are same in size

void GVEnsureVisible(CGridCtrl* pGridCtrl, int nRow)
	if(pGridCtrl== NULL)


	int nItems = pGridCtrl->GetItemCount();

	int nPos = nRow;

	if(nItems > 0)

		pGridCtrl->GetScrollInfo(SB_VERT, &si);

		double dx = (double)si.nMax / (double)nItems;

		si.cbSize = sizeof(SCROLLINFO);

		si.fMask = SIF_POS;

		si.nPos = (int)(dx * nPos) - si.nPage/2;

		pGridCtrl->SetScrollInfo(SB_VERT, &si, TRUE); 


Points of Interest

This code will only work if all the rows of the Grid are of same size.


Article Uploaded : 5th March, 2012.


This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


About the Author

Mukit, Ataul
Chief Technology Officer Rational Technologies
Bangladesh Bangladesh
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Comments and Discussions

QuestionCan you explain how this makes fast scroll? Also compare it with EnsureVisible, too. Pin
ehaerim24-Oct-13 10:56
memberehaerim24-Oct-13 10:56 
AnswerRe: Can you explain how this makes fast scroll? Also compare it with EnsureVisible, too. Pin
Mukit, Ataul25-Oct-13 22:34
memberMukit, Ataul25-Oct-13 22:34 

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