TreelistView performance; expanding+horizontal scroll

[Jatinder]

Hi 

I am having really bad performance issues with a small data set, both scrolling horizontally and with expanding rows.
I have 20 columns and a mere 50 rows in my test application. With real data i expect the same columns but with maybe 100-300 rows.

I am using latest internal binaries. I am using no converters, no style selectors (i am using column groups but even removing those dont help).... so all in all a very vanilla test.

My horizontal scrolling is slow and choppy with just 25 columns
My Expanding rows is dreadful almost like a 1-2 seconds to expand!!!

Looking at the concerns in the previous post with measureoveride being called for each cell and row I am not sure what i should be doing to fix the performance?? Apart from your (Vlad's) previous post which is to try to hack into the gridview to make my scenario work with a custom expand column?

As for my use cases - i dont need any filtering, sorting. 
Just expanding rows, drag and dropping rows, cell editing, column groups

Please help.

Attached is my desired final UI. I can provide source code to my sample application if someone wants to have a look

[Vlad]

Hi,

 I've already answered your other post. If you do not need hierarchical sorting and/or filtering you can use the approach I've used in the attached application.

Kind regards,
Vlad
the Telerik team

[Jatinder]

Hi Vlad

I am trying to work on your sample application to make sure all my scenarios are handled which i could with the treelistview.

I am trying to enable validation on the custom column but it doesnt behave like validation on another column.

Its a textbox as my edit item. When validation error happens firstly - it doesnt show a red outline around the textblox. I am guessing its not picking up the styles from theme? 

here is the altered code: 

public override System.Windows.FrameworkElement CreateCellElement(Telerik.Windows.Controls.GridView.GridViewCell cell, object dataItem)
        {
            var col = cell.Content as StackPanel;

            if (col == null)
            {
                col = new StackPanel(){Orientation = Orientation.Horizontal};

                var toggleButton = new GridViewToggleButton() { PresentationMode = GridViewToggleButtonPresentationMode.Arrow };
                toggleButton.SetBinding(GridViewToggleButton.IsCheckedProperty,
                    new Binding("IsExpanded") { Source = cell.ParentRow, Mode = BindingMode.TwoWay });

                var tex = new TextBlock();
                tex.SetBinding(TextBlock.TextProperty, new Binding("Name") { Source = dataItem, Mode = BindingMode.TwoWay });

                col.Children.Add(toggleButton);
                col.Children.Add(tex);
            }

            cell.HorizontalContentAlignment = System.Windows.HorizontalAlignment.Left;

            cell.SetBinding(GridViewCell.PaddingProperty,
                new Binding("Level") { Source = dataItem, Converter = new MyLevelToThicknessConverter() });

            return col;
        }

        public override System.Windows.FrameworkElement CreateCellEditElement(GridViewCell cell, object dataItem)
        {
            var cellEditElement = new TextBox();
            this.BindingTarget = TextBox.TextProperty;
            System.Windows.Data.Binding valueBinding = this.CreateValueBinding();
            cellEditElement.SetBinding(TextBox.TextProperty, valueBinding);
            cellEditElement.Margin = cell.Padding;
            cellEditElement.Height = cell.ActualHeight - 4;
            cellEditElement.HorizontalAlignment = HorizontalAlignment.Stretch;
            return cellEditElement as FrameworkElement;
        }


        private Binding CreateValueBinding()
        {
            System.Windows.Data.Binding valueBinding = new System.Windows.Data.Binding();
            valueBinding.Mode = BindingMode.TwoWay;
            valueBinding.NotifyOnValidationError = true;
            valueBinding.ValidatesOnExceptions = true;
            valueBinding.UpdateSourceTrigger = UpdateSourceTrigger.Explicit;
            valueBinding.Path = new PropertyPath(this.DataMemberBinding.Path.Path);
            return valueBinding;
        }