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Syncronize Datagrid scroll

Posted on 2003-03-04
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Last Modified: 2010-04-15
On my C# windows application form I have two datagrids,
bound to different tables. Those tables have same number
and type of columns i.e. both the grids are identical.

What I want to do is, when one of the grid is scrolled
(Horiz.) by some amount, I want the other grid also should
scroll by similar amount. If first visible column on grid
is half visible, then it should be the case for the other
grid as well.

Right now I am handling the scroll event. The logic that I am following is - when the first grid is scrolled I find its leftmost column and right most column. Then I set the current cell property of second grid to the right cell of first grid and then to the left cell of first grid.

But problem with this event is when I scroll the first grid to partial width, it doesn't scroll the second grid by similar partial amount. Only after the complete column has been scrolled on the first grid, it scrolls the column on second grid.

private void dataGrid1_Scroll(object sender, System.EventArgs e)
{
int leftColumn = Convert.ToInt32( dataGrid1.FirstVisibleColumn.ToString());
int rightColumn = dataGrid1.VisibleColumnCount + Convert.ToInt32( dataGrid1.FirstVisibleColumn.ToString());
                             
dataGrid2.CurrentCell = new DataGridCell(dataGrid2.CurrentRowIndex, rightColumn);
dataGrid2.Refresh();
Application.DoEvents();
dataGrid2.CurrentCell = new DataGridCell(dataGrid2.CurrentRowIndex, leftColumn);
}



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Comment
Question by:ruchigup
3 Comments
 

Expert Comment

by:ThAWebMasteR
ID: 8074385
You can use two CurrencyManagers. With a simple eventhandler you can give them the same value.
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Author Comment

by:ruchigup
ID: 8074768
Thanks for your comment.
I figured out one way and it works for me:-
Create a derieved class, since HorizScrollBar property and GridHScrolled method are protected.

public class MyGrid:System.Windows.Forms.DataGrid
{    

    public int getHorizScrollBarX()
    {
        return this.HorizScrollBar.Value;
    }
    public void setHorizScrollBarX(int x)
    {

        this.GridHScrolled(this, new ScrollEventArgs System.Windows.Forms.ScrollEventType.LargeIncrement, x));
    }

}

Set both the datagrids to be of type MyGrid. In the scroll event just write.

private void dataGrid1_Scroll(object sender, System.EventArgs e)
{
    int x = dataGrid1.getHorizScrollBarX();
    dataGrid2.setHorizScrollBarX(x);
}

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Accepted Solution

by:
modulo earned 0 total points
ID: 11805718
PAQed, with points refunded (50)

modulo
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