Hi 

Currently I am trying to change the height of the GridViewColumnGroup from a global style,

Right now the height is being altered but its not quite I am looking for.

This is the current result Where the header is no longer vertically aligned 

These are the global style tags

The desired result is for the Height value to be changed via a data trigger and the group header to be aligned vertically in the center

Any assistance here would be appreciated 

I'm facing an issue with the RadMenu control. I have a requirement where I need to display a menu with collapsible items, and I would like some guidance on how to implement this functionality.

Here's a simplified example of my current XAML code:

In this example, I have two RadMenuGroupItems, "A" and "B", each bound to a separate list (Alist and Blist respectively). Currently, the items are displayed in an expanded state by default.

However, I would like to achieve the following behavior:

1. Initially, all the items in the lists should be collapsed, i.e., hidden.

2. Users should be able to expand and collapse the items by clicking on the respective RadMenuGroupItem headers. When the header is clicked, the items should toggle between being expanded (visible) and collapsed (hidden).

Is there a built-in way to achieve this behavior in the RadMenu or RadMenuGroupItem controls? If not, could you please provide some guidance on how I can implement this functionality myself?

I appreciate any assistance or code examples you can provide to help me accomplish this requirement.

Thank you in advance for your help.

Hello,

Here is my situation:

1. I have got client app in WPF ( Cant create here any db context etc )

2. I have got Rest Api where is DbContext (EntityFramework)

3. I have got RadGrid and RadPager

I want to pass QueryableCollectionView or QueryableEntityCollectionView or something else? to this rest api, processing data, use filters, pagination and sorters from radgrid. Then in returns i want to receive collection of Products, Employees or something

Is any body do something like this? I know that in Blazor UI there is DataSourceRequest etc and it works fine, but i did not find alternative in WPF

Hello,

I use RadPdfViewer to view a PDF file in my WPF application, the PDF file has only one page and the contents are in the middle of the page, so I'm trying to zoom and focus on the middle of the page, I use the following code:

private void DocumentChanged(object sender, DocumentChangedEventArgs e)
        {
            pdfViewer.ScaleFactor = 1.3;
            var size = pdfViewer.Document.Pages[0].Size;
            pdfViewer.ScrollToVerticalOffset(size.Height * 0.3);
            pdfViewer.ScrollToHorizontalOffset(size.Width * 0.20);
        }

however, I only see the horizontal scroll working.

How can I zoom then scroll to vertical and horizontal offset?

Hello,

I have a strange behavior during grouping.

When I drag a column to the header and the grouping is performed then you redraw the RadGridView layout.

Sometimes I see the first group at the middle of the grid instead of the top (there is an empty space in half of the grid). If I scroll a little bit then the layout is fixed and the grid looks as expected.

I tried to InvalidateVisual on the Grouped event but it looks the same. How do I solve it ?

Hello,

I am working with a RadGridView and developed two features:

1. A ListBox that displays the RadGridView's columns where the user can check/uncheck some columns or all of them. The purpose of the control is to show or hide the columns according to the CheckBox state.

2. User Settings mechanism that saves the columns visibility status to a file. After the application starts, I load the IsVisible status to the columns and override the configured value in the xaml.

I noticed that the default behavior in RadGridView is to show the rows even when there are 0 visible columns and the SelectedItem remains.

I would like to hide the rows and unselect the items.

I tried to use a data trigger to do this funcionality.

It works with a DataTrigger when the value Columns.Count = 0.

To finish this functionality I would like to update the data trigger to the Visible Columns count, which is not provided by Telerik.

How can I do that?

I tried to create an attached property that maintains a counter when the user change the state of the columns visibility from the ListBox, but it does not work when the state is changed from the xaml or the user settings.

I don't want to bind to Columns Collection Changed and Visibility Changed because I think it is an overhead for this functionality. 

Can you expose this property or help me with a better solution?

Hi Telerik Community,

How can I get programmaticaly the result of a column aggregate ? I tried something like "Column.Footer" but my footer is <null>...

I have thought of something like "Column.Footer.Cell.Value" or maybe "Column.AggregateResult"...

Regards,

Matthieu M

A list is to be displayed using the RadTreeListView. It should be possible to add a single element or to delete several selected elements. As soon as a new element is added, all other elements should be deselected and the new element should be selected.

The problem is that if a certain number of elements is deleted, afterwards just as many newly added elements are automatically deselected, although they were previously explicitly selected programmatically.

Example with test application

Initial state:

→ Click "Add" to add a new element:

→ Click "Delete" to delete selected element (for simplicity the automatically selected element just added is used):

→ Click "Add" to add a new element:

Element 4 should now be selected.

→ Click "Add" to add a new element:

<StackPanel>

    <Button Click="Add_Button_Click">Add</Button>

    <Button Click="Delete_Button_Click">Delete</Button>

    <telerik:RadTreeListView ItemsSource="{Binding VM.Elements}"
                                SelectionMode="Multiple"
                                IsSynchronizedWithCurrentItem="False"
                                RowIndicatorVisibility="Collapsed"
                                >

        <telerik:RadTreeListView.RowStyle>
            <Style TargetType="{x:Type telerik:TreeListViewRow}">
                <Setter Property="IsSelected" Value="{Binding IsSelected, Mode=TwoWay}"/>
            </Style>
        </telerik:RadTreeListView.RowStyle>

    </telerik:RadTreeListView>

</StackPanel>

public partial class MainWindow : Window
{
    public ViewModel VM { get; set; }

    public MainWindow()
    {
        InitializeComponent();

        VM = new ViewModel();

        DataContext = this;
    }

    private void Add_Button_Click(object sender, RoutedEventArgs e)
    {
        VM.AddNewData();
    }

    private void Delete_Button_Click(object sender, RoutedEventArgs e)
    {
        VM.Elements.RemoveAll(x => x.IsSelected);
    }
}

public class ViewModel
{
    public ObservableCollection<Data> Elements { get; set; } = new ObservableCollection<Data>();

    public ViewModel()
    {
        Enumerable.Range(0, 3).ForEach(_ => AddNewData());

        Elements.CollectionChanged += Data_CollectionChanged;
    }

    public void AddNewData()
    {
        Elements.Add(new Data());
    }

    private void Data_CollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
    {
        if (e.Action == NotifyCollectionChangedAction.Add)
        {
            Elements.ForEach(x => x.IsSelected = false);

            e.NewItems?.OfType<Data>().ForEach(x => x.IsSelected = true);
        }
    }

    public class Data : INotifyPropertyChanged
    {
        static private int counter = 0;

        public event PropertyChangedEventHandler? PropertyChanged;

        private bool isSelected = false;
        public bool IsSelected
        {
            get
            {
                return isSelected;
            }
            set
            {
                isSelected = value;
                OnPropertyChanged(nameof(IsSelected));
            }
        }
            
        public int Id { get; set; } = counter++;

        protected void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

Hi,

Im using conversationalUI in a WPF app and would like to update the message in realtime as my openAI response is streaming in to make the UX a better experience on long responses. This should update the message being displayed in realtime as the service is streaming in text.

I only see the ability to do a message.Add() option, I feel like there should also be a AddAsync() method. Is this even possible in this control? 

Thanks in advance!

If I have subscribed to the RadCarouselPanel.SelectedIsTopItem event, should I not get notifications when that property changes to false?

In my case, when the user scrolls the mouse wheel over the control or hits the little left/right buttons at the bottom of the carousel, the selected item certainly moves off of the top.  But the event is never fired.  It is only fired when I left click on the item to make the control force it to the top.


To illustrate, here is how I find the panel and subscribe to the events

var panel = this.Carousel.FindChildByType<RadCarouselPanel>();
panel.IsAnimatingChanged += Panel_IsAnimatingChanged;
panel.SelectedIsTopItem += Panel_SelectedIsTopItem;

I then have debug log lines in the two handler functions to let me know when the events fire.

private void Panel_SelectedIsTopItem(object sender, RoutedEventArgs e)
{
    var panel = (RadCarouselPanel)sender;
    Log.Debug($"Panel SelectedIsTopItem changed to {panel.IsSelectedTopItem}");
}

private void Panel_IsAnimatingChanged(object sender, RoutedEventArgs e)
{
    var panel = (RadCarouselPanel)sender;
    Log.Debug($"Panel is animating changed to {panel.IsAnimating}");
}

When I bring up my display the selected item is at the top by default







Then I use the mouse wheel or the scroll buttons to move the panel items without changing the selected item.  Note that the blue "selected" rectangle still appears around #002 to the left even though it is not #003 that is topmost





But all I get in my log is IsAnimatingChanged events 

15:31:50.690 [  1] DEBUG - Panel_IsAnimatingChanged: Panel is animating changed to True
15:31:50.977 [  1] DEBUG - Panel_IsAnimatingChanged: Panel is animating changed to False

But now if I  left-click the new topmost item (#003), then it becomes selected




and I am notified that SelectedIsTopMost has changed, along with an event about IsAnimating changed even though no animation occurs in this instance

15:36:16.447 [  1] DEBUG - Panel_IsAnimatingChanged: Panel is animating changed to True
15:36:16.725 [  1] DEBUG - Panel_SelectedIsTopItem: Panel SelectedIsTopItem changed to True
15:36:16.730 [  1] DEBUG - Panel_IsAnimatingChanged: Panel is animating changed to False

In order for the event SelectedIsTopMost to be useful to me, I have to be notified about it when it becomes false.   Why am I not being told this?


For sake of completeness, here is my XAML

<tk:RadCarousel x:Name="Carousel"
    Padding="0" Margin="0"
    Grid.Row="1"
    ItemsSource="{Binding ScansView}"
    VerticalContentAlignment="Top"
    IsVisibleChanged="Carousel_OnIsVisibleChanged"
    HorizontalAlignment="{Binding HorizontalAlignment}" VerticalAlignment="{Binding VerticalAlignment}"
    >