I have placed a RadialGauge with RadialScale inside a ViewBox.  To get the RadialGauge to display correctly, I have bound the height and width of the RadialGauge to the actual height and width of the the Grid that holds the RadialGauge.  The RadialGauge sizes correctly to the ViewBox although the labels actually get smaller as the Viewbox stretches to fill the window it is in. How do I get the  Indicator label size to change when the size of the ViewBox is changed?

I'm experiencing UI hang and slow chart updates when trying to plot ~10,000 points of scrolling data (10 traces, 1,000 points each) in a WPF .Net Core 8 application. This occurs with Direct2DRenderOptions and BitmapRenderOptions. I'm using a ScatterLineSeries ("SL") with data binding to a simple class with "X" and "Y" properties (see below). I'm adding points to each trace in real time and updating the HorizontalAxis Minimum and Maximum to make the data scroll across the screen. The update time is 5 FPS. The chart updating slows down at >=500 points in each trace and the UI starts to hang. I also reviewed the real time charting demo and have tried using the async data source described here xaml-sdk/ChartView/WPF/AsyncData at master · telerik/xaml-sdk with no improvement.

Any suggestions would be greatly appreciated.

Thanks, Vern

Hi,

I encountered the same issue as this - https://www.telerik.com/forums/radopenfolderdialog-is-super-slow

May I ask if there is any solution to date?

Regards

I want to customize GroupDescription to meet our needs. Here is the `EquipmentGroupDescription` class: public class EquipmentGroupDescription : GroupDescription { public override object GroupNameFromItem(object item, int level, CultureInfo culture) { var experiment = item as Experiment; if (experiment == null) return null; return experiment.EquipmentID; } } The `Experiment` class inherits from `Appointment`: public class Experiment : Appointment { public string ID { get; set; } public string Name { get; set; } public string EquipmentName { get; set; } public Guid EquipmentID { get; set; } } I need to group `Experiment` by `EquipmentID` and `DateTime`. Here is the XAML: <telerik:RadScheduleView x:Name="scheduler" ActiveViewDefinitionIndex="1" FirstVisibleTime="12:00" GroupDescriptionsSource="{Binding CustomGroupDescriptions}" AppointmentsSource="{Binding Experiments}"> <telerik:RadScheduleView.GroupHeaderContentTemplate> <DataTemplate> <TextBlock Text="{Binding}" Foreground="White" FontWeight="Bold"/> </DataTemplate> </telerik:RadScheduleView.GroupHeaderContentTemplate> <telerik:RadScheduleView.AppointmentItemContentTemplate> <DataTemplate> <StackPanel> <TextBlock Text="{Binding Appointment.Name}" FontWeight="Bold" Foreground="White"/> <TextBlock Text="{Binding Appointment.EquipmentName}" Foreground="#DDD"/> </StackPanel> </DataTemplate> </telerik:RadScheduleView.AppointmentItemContentTemplate> <telerik:RadScheduleView.ViewDefinitions> <telerik:DayViewDefinition /> <telerik:WeekViewDefinition /> <telerik:MonthViewDefinition /> <telerik:TimelineViewDefinition DayStartTime="08:00" /> </telerik:RadScheduleView.ViewDefinitions> </telerik:RadScheduleView> ``` In the ViewModel,

private readonly Guid pivot1 = Guid.NewGuid();
private readonly Guid pivot2 = Guid.NewGuid();

var items = LoadAppointmentsSource();
Experiments = items.ToObservableCollection();
CustomGroupDescriptions = new ObservableCollection<EquipmentGroupDescription>
    {
        new EquipmentGroupDescription()
    };

private IEnumerable<Experiment> LoadAppointmentsSource()
{
    var items = new List<Experiment>
    {
        new Experiment()
        {
            Subject="1",
            Name="K Experiment 1",
            EquipmentID=pivot1,
            EquipmentName="Pivot",
            Start=DateTime.Today.AddDays(1).AddHours(12),
            End=DateTime.Today.AddDays(1).AddHours(13)
        },
        new Experiment()
        {
            Subject="2",
            Name="K Experiment 2",
            EquipmentID=pivot2,
            EquipmentName="Pivot",
            Start=DateTime.Today.AddDays(1).AddHours(12),
            End=DateTime.Today.AddDays(1).AddHours(13)
        },
    };
    var firstDate = items.Min(new Func<Experiment, DateTime>(p => p.Start.Date));

    var firstDay = CultureInfo.CurrentCulture.DateTimeFormat.FirstDayOfWeek;
    var dayOfWeekNumber = (int)DateTime.Today.DayOfWeek == 0 ? 7 : (int)DateTime.Today.DayOfWeek;
    var firstDayOfCurrentWeek = DateTime.Today.Subtract(TimeSpan.FromDays(dayOfWeekNumber - (int)firstDay));

    var offset = firstDayOfCurrentWeek - firstDate;

    foreach (var item in items)
    {
        item.Start += offset;
        item.End += offset;
    }

    return items;
}

private ObservableCollection<Experiment> experiments;

public ObservableCollection<Experiment> Experiments
{
    get { return experiments; }
    set
    {
        experiments = value;
        OnPropertyChanged();
    }
}

private ObservableCollection<EquipmentGroupDescription> customGroupDescriptions;

public ObservableCollection<EquipmentGroupDescription> CustomGroupDescriptions
{
    get { return customGroupDescriptions; }
    set
    {
        customGroupDescriptions = value;
        OnPropertyChanged();
    }
}

the Telerik version used is 2022.3.912.310. During debugging, I found that `GroupDescriptionsSource`

contains two objects: `EquipmentGroupDescription` and `DatetimeGroupDescription`.

However, `EquipmentGroupDescription` has 0 items in `GroupNames`, and its `GroupNameFromItem`

method is never called.

I currently have an RadAutoCompelteBox similar to this:

        <telerik:RadAutoCompleteBox  x:Name="MyGrid"
                                 KeyDown="OnSearchBoxKeyDown"
                                 SearchTextChanged="OnSearchTextChanged"
                                 ItemsSource="{Binding Source={StaticResource ViewModel}}, Path=Data.MyData"
                                 SelectionMode="Single"
                                 DisplayMemberPath="Display"
                                 TextSearchPath="MyNumber"
                                 SelectedItem="{Binding SelectedItem, Mode=TwoWay}"
                                 SearchText="{Binding SearchText, Mode=TwoWay}"
                                 TextSearchMode="Contains"
                                 DropDownItemTemplate="{StaticResource MyDropDownTemplate}">
            <telerik:RadAutoComplete.FilteringBehavior>
                <telerik:AsyncFilteringBehavior/>
            </telerik:RadAutoComplete.FilteringBehavior>
        </telerik:RadAutoCompleteBox>

What is happening is this.
View the view loads we load the selected item has it has a value. (Say "123456").

When the user clicks on the autocompeltebox the whole selection highlights. (That's fine)
User then clicks it a second time and the cursor is then at the end of the 6 in my example.
User then clicks backspace and the entire selection clears out. 

At that point why would it not just remove the 6?

        private void OnSearchTextChanged(object sender, EventArgs e)
        {
            // Try to capture this and do what I want.
        }

I've tried to use this method to achieve what I want to happen, however the EventArgs is always empty.

How can I accomplish this? (I want the backspace to clear one character at a time)

I will note that we have other AutoCompleteBoxes that work as intended the only difference between those ones and this one is that the ones that work have all the data loaded up front in the ItemsSource.
This one we are searching the DB for the data as the user types.

I just found a 15 year old post about RadComboBox filtering and virtualization not working

I cant understand why this hasn't been fixed yet ? 

GridView supports filtering and virtualization, so it's not like you dont know how to fix it.

You ESPECIALLY need virtualization AND filtering when you have 1000+ elements in your ComboBox like i do, 

we have a list of 3000 companies that i want to use in a selector...

it's only after completly abandonding RadComboBox and using the RadAutocompleterBox that i was able to achieve what i wanted - kind of. 

Could you PLEASE prioritize this missing feature ?

I am using the RadTimeSpanPicker to choose a duration, and I'd like to style the Clear and Close buttons to match the Run New Objective button.  How can I access the button styles?

Thanks,

Chuck