Fetching time

[James]

Hi,

I am testing the DataGrid control in order to use it in a project and I am wondering if the time that it takes to render the grid at the view when scrolling can be improved. It has a huge amount of data and it's just a few miliseconds but it would be great if this can be improved and none blank "gaps" appear.

Also, when I try to scroll and there is nothing to scroll, there is a bounce effect, is it possible to disable that?

Finally, is there a way of merging cells as it is done in WinForms?

Thanks,
James

01.<Page
02.    x:Class="App1.MainPage"
03.    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
04.    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
05.    xmlns:local="using:App1"
06.    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
07.    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
08.    xmlns:Grid="using:Telerik.UI.Xaml.Controls.Grid"
09.    mc:Ignorable="d">
10.
11.    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
12.        <Grid:RadDataGrid
13.            x:Name="Grid"
14.            CanDrag="False"
15.            UserColumnReorderMode="None"
16.            UserSortMode="None"
17.            ItemsSource="{Binding Rows}"
18.            AutoGenerateColumns="False"
19.            AllowDrop="False"
20.            SelectionMode="Single"
21.            SelectionUnit="Cell"
22.            UserGroupMode="Disabled"
23.            UserEditMode="None"
24.            UserFilterMode="Disabled"
25.            FrozenColumnCount="1"
26.            IncrementalLoadingMode="Auto"
27.            ScrollViewer.IsDeferredScrollingEnabled="False"
28.            ScrollViewer.IsHorizontalScrollChainingEnabled="True"
29.            ScrollViewer.IsVerticalScrollChainingEnabled="True"
30.            ScrollViewer.IsScrollInertiaEnabled="True"
31.            ScrollViewer.IsZoomChainingEnabled="False"
32.            ScrollViewer.ZoomMode="Disabled"
33.            ScrollViewer.VerticalScrollBarVisibility="Hidden"
34.            ScrollViewer.HorizontalScrollBarVisibility="Hidden"
35.            ManipulationMode="ScaleInertia"
36.            >
37.        </Grid:RadDataGrid>
38.    </Grid>
39.</Page>

 

01.public sealed partial class MainPage : Page
02.    {
03.        public MainPage()
04.        {
05.            this.InitializeComponent();
06.            this.DataContext = new TestViewModel();
07.            InitGrid();
08.        }
09.
10.        public List<Row> Rows { get; set; }
11.
12.        private void InitGrid()
13.        {
14.            Rows = new List<Row>();
15.            for (int i = 0; i < 250; ++i) {
16.                Rows.Add(new Row());
17.            }
18.
19.            Random r = new Random();
20.            for (int i = 0; i < 250; ++i) {
21.
22.                StringBuilder sb = new StringBuilder();
23.                sb.Append("<DataTemplate xmlns=\"http://schemas.microsoft.com/winfx/2006/xaml/presentation\">");
24.                sb.Append("<Grid Width=\"60\">");
25.                sb.Append("<TextBlock Margin=\"1\" HorizontalAlignment=\"Center\" Text=\"{Binding Path=Values[" + i.ToString() + "], Mode=OneWay}\" FontSize =\"18\" Foreground=\"Black\" />");
26.                sb.Append("</Grid>");
27.                sb.Append("</DataTemplate>");
28.                DataTemplate datatemplate = (DataTemplate)XamlReader.Load(sb.ToString());
29.
30.                var col = new DataGridTemplateColumn();
31.                col.Header = $"Column_{i}";
32.                col.CellContentTemplate = datatemplate;
33.                Grid.Columns.Add(col);
34.            }
35.        }
36.    }

 

01.public class TestViewModel
02.    {
03.        private Random random;
04.
05.        public List<Row> Rows { get; set; }
06.
07.        public TestViewModel()
08.        {
09.            random = new Random();
10.            Rows = new List<Row>();
11.            for (int i = 0; i < 250; ++i)
12.            {
13.                Rows.Add(new Row());
14.            }
15.        }
16.
17.    }
18.    public class Row
19.    {
20.        public Row() {
21.            var r = new Random();
22.            Values = new List<string>();
23.            for (int i = 0; i < 250; ++i)
24.            {
25.                string s = GenerateName(r.Next(7));
26.                Values.Add(s);
27.            }
28.        }
29.
30.        public List<string> Values { get; set; }
31.
32.        private static string GenerateName(int len)
33.        {
34.            Random r = new Random();
35.            string[] consonants = { "b", "c", "d", "f", "g", "h", "j", "k", "l", "m", "l", "n", "p", "q", "r", "s", "t", "v", "w", "x" , "y", "z" };
36.            string[] vowels = { "a", "e", "i", "o", "u" };
37.            string Name = "";
38.            Name += consonants[r.Next(consonants.Length)].ToUpper();
39.            Name += vowels[r.Next(vowels.Length)];
40.            int b = 2;
41.            while (b < len)
42.            {
43.                Name += consonants[r.Next(consonants.Length)];
44.                b++;
45.                Name += vowels[r.Next(vowels.Length)];
46.                b++;
47.            }
48.            return Name;
49.        }
50.    }

[Ivaylo Gergov]

Hello James,

Thank you for your interest.

Generally, we have plans to improve the performance of our RadDataGrid(our plan is to include Direct2D rendering option) but we do not have a specific time frame yet. Also, we intend to extend the Grid's API so that the developer can change the buffer size on top and at the bottom of the already realized items and avoid such gaps when scrolling.

The merge cells feature is not supported and it is not part of our planning.

Please, let me know should you need further assistance.

Regards,
Ivaylo Gergov
Telerik