I use Eto’s TreeGridView and display a single column that uses Eto’s CustomCell. This seems to render correctly until the tree is large enough so that it gets a scroll bar. Once I start scrolling to view the tree, the cells can be rendered in a different order than they exist in the DataStore.
Example:
I created a tree to display two different types of Nodes, A and B. The tree’s datastore is initialized:
public class Root : ITreeGridStore<Node>, ITreeGridItem
{
List<Node> nodes;
public Root()
{
nodes = new List<Node>();
for (int i = 0; i < 10; i++)
{
nodes.Add(new NodeA(this));
nodes.Add(new NodeA(this));
nodes.Add(new NodeB(this));
nodes.Add(new NodeB(this));
}
}
where the column is set up to display the cell via:
column = new GridColumn
{
AutoSize = true,
Editable = true,
Resizable = false,
Sortable = false,
DataCell = new CustomCell
{
CreateCell = (args) => (args.Item as Node).CreateCell(args),
ConfigureCell = (args, control) => { control.DataContext = args.Item; }
}
and where the create cell functions are:
public class NodeA : Node
{
public NodeA(ITreeGridItem p) : base(p) { }
public override Control CreateCell(CellEventArgs a)
{
return new Label { Text = "A A A", BackgroundColor = Colors.Blue };
}
}
public class NodeB : Node
{
public NodeB(ITreeGridItem p) : base(p) { }
public override Control CreateCell(CellEventArgs a)
{
return new Label { Text = "B B B", BackgroundColor = Colors.Yellow };
}
}
This shows how the cells can be created/?displayed in a different order than the datastore when the tree is scrolled up and down:
Is there a way to prevent this issue?
Code:
EtoTreeGridViewDemo1.zip (93.6 KB)