This is a migrated thread and some comments may be shown as answers.

Problem with Grid / rows position

5 Answers 180 Views

GridView

This is a migrated thread and some comments may be shown as answers.

Daniel asked on 05 Jan 2011, 05:28 PM

Hello, I've got a problem with the grid position
In some specific case, the rows position in the RadGridView are too high.
So when the scroll bar is at the top, you are missing some rows
And when you are at the bottom, you have empty space.

So this happen when I call BeginUpdate(); EndUpdate(); while I'm scrolling.
And only scrolling with the left click (no wheel)
Use the sample code and left clic on the scrollbar, go all the way down, and Voila.
Everything go back to normal if you use the wheel all the way to the Top. But it's not acceptable for our user

const int CST_AUTO_EXPAND_START = 15; //Last %

bool m_alreadyScroll = false;

public Form1()

{

InitializeComponent();

}

private void AddDatas()

{

List<string> datas = new List<string>();

for (int i = 0; i < 50; i++)

{

datas.Add("string" + i.ToString());

}

radGridView1.DataSource = datas;

}

public void ExpandPage()

{

m_alreadyScroll = true;

radGridView1.BeginUpdate();

//Normally I would update my datasource here threw a background worker

radGridView1.EndUpdate();

}

private void Form1_Load(object sender, EventArgs e)

{

radGridView1.GridElement.VScrollBar.ValueChanged += new EventHandler(VScrollBar_ValueChanged);

AddDatas();

}

void VScrollBar_ValueChanged(object sender, EventArgs e)

{

if (m_alreadyScroll)

return;

Telerik.WinControls.UI.RadScrollBarElement scrollBar = (Telerik.WinControls.UI.RadScrollBarElement)sender;

int maxValue = scrollBar.Maximum - scrollBar.LargeChange;

//if the scroll bar is in the bottom zone, we search for new data

if (maxValue - maxValue * CST_AUTO_EXPAND_START / 100 < scrollBar.Value)

ExpandPage();

}

Problem with Grid / rows position

5 Answers, 1 is accepted