Dear sir/madam,
I used your solution for adding a checkbox in grouprows of a grid for UI Winforms:
winforms-sdk/GridView/GridCheckAllGroupRows at master · telerik/winforms-sdk · GitHub
Only specific grouprows need a checkbox, not all grouprows, which I handle in the CreateCell event. So far so good, seems to work perfect.
But.... when I start scrolling in the grid, because not all grouprows are visible in one screen, and the grouprows that have a checkbox leave the screen because of scrolling down, and then scrolling up again, the checkbox in the grouprow is gone, and grouprows that did not have the checkbox have now a checkbox?
Strange, I cannot figure out what is going wrong.
Hopefully I succeeded in describing the situation clearly.
Help would be appreciated.
Kind regards.
1 Answer, 1 is accepted
Hello Nico,
Thank you for the provided details. This behavior is due to the UI virtualization in RadGridView, cell elements are created only for currently visible cells and are being reused during operations like scrolling, filtering, grouping, and so on. This means that only the data underneath the cells is changed. What you can do here is handle this in the custom group cell SetContent() method. You can hide or show the checkbox by setting the Visibility property to true. However, this approach would be possible if you can access all required data in the CustomGridGroupContentCellElement class. For example:
public override void SetContent()
{
base.SetContent();
this.DrawText = false;
textElement.Text = ((GridViewGroupRowInfo)this.RowInfo).HeaderText;
checkBoxElement.CheckStateChanged -= checkBoxElement_CheckStateChanged;
if (this.RowInfo.Tag != null)
{
checkBoxElement.Checked = (bool)this.RowInfo.Tag;
}
else
{
checkBoxElement.Checked = false;
}
checkBoxElement.CheckStateChanged += checkBoxElement_CheckStateChanged;
if (this.RowIndex % 2 != 0)
{
this.checkBoxElement.Visibility = Telerik.WinControls.ElementVisibility.Collapsed;
}
else
{
this.checkBoxElement.Visibility = Telerik.WinControls.ElementVisibility.Visible;
}
}Using this above code, the CheckBoxElement is hiding on specific rows.
Regards,
Dinko | Tech Support Engineer
Progress Telerik
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