TreeCell Selection

[Qingde Shi]

Hi,

In the Virtual TreeGrid example, How to enable selecting multiple cells starting from one of the TreeCells by holding mouse.

Thanks,

Q

[haneefm]

Hi Q,

You need to override the TreeCellRenderer's OnHitTest and OnClick method to solve this issue in a VitrualTreeGridControl. Below are the codes that shows this task.

protected override int OnHitTest(int rowIndex, int colIndex, MouseEventArgs e, IMouseController controller)
{
if(e.Button != MouseButtons.None )
{
return GridHitTestContext.None ;
}
else
return 0 ;
}

protected override void OnClick(int rowIndex, int colIndex, System.Windows.Forms.MouseEventArgs e)
{
//if you call ClickTreeNode here instead of OnMouseDown,
//then the action is done later after the mouseup...
ClickTreeNode(rowIndex, colIndex, e);
base.OnClick(rowIndex, colIndex, e);
return;
}

Here is a sample for reference.
VirtualTreeSelectionModified.zip

Best regards,
Haneef