Hello.

I would like to ask about the Check All function in using listbox.
I usually leave Check All aside.
But when I looked at the sample of ASP.NET (Teleik), I saw that they were tied together.

Is this even possible in WPF? What conditions are required for that?

Thanks.

My app uses the XAML binaries and the theme manager to set the application wide theme to Windows8Touch.  I also set custom palette colors at the same time. 

But whenever I want to customize a Telerik style, it seems I have to copy all of the relevant Theme XAML out of the Telerik Theme folder, replicate it in my app, and then base my styles off of that.  That's the only way that seems to work.

Because whenever  I try to base my custom style off just the type default, like this:

    <Style TargetType="{x:Type tk:RadPathButton}" BasedOn="{StaticResource {x:Type tk:RadPathButton}}">

I get weird results.  Colors don't match my the ones I set at application start times and it looks like the XAML comes from a different theme sometimes.

Is the rule that I must copy Telerik XAML in this situation or am I doing something else wrong?

In my current WPF/MVVM project, which uses package Telerik.Windows.Controls.Spreadsheet.for.Wpf.Xaml for a view, I would like to keep the ViewModel in a netstandard2.0 project. The ViewModel project references package Telerik.Documents.Spreadsheet and exposes a property of type Telerik.Windows.Documents.Spreadsheet.Model.Workbook to which the view binds in XAML.
At runtime I get (nonsensical?) XAML Binding Failures:
1. Cannot create default converter to perform 'one-way' conversions between types 
    'Telerik.Windows.Documents.Spreadsheet.Model.Workbook' and 
    'Telerik.Windows.Documents.Spreadsheet.Model.Workbook'. 
    Consider using Converter property of Binding.
 2. Value 'Telerik.Windows.Documents.Spreadsheet.Model.Workbook' (type Workbook) 
    cannot be assigned to property RadSpreadsheet.Workbook (type Workbook).
Adding an empty "no-op" System.Windows.Data.IValueConverter gets rid of those, but still an empty grid is displayed, although the ViewModel constructor prepopulates the spreadsheet.  
Note the system behaves as expected when I instead use the same code in the net5.0 project that via package Telerik.Windows.Controls.Spreadsheet.for.Wpf.Xaml references package Telerik.Windows.Documents.Spreadsheet (which also has type Model.Workbook)

If Telerik.Windows.Documents.Spreadsheet and Telerik.Documents.Spreadsheet serve different purposes, why do they have the same namespaces?
How can I have my ViewModel in netstandard2.0?

Please find a small repro attached.
In Telerik.Spreadsheet.WPF.csproj switch Property "ViewModel" between values "direct" and "indirect" to toggle between the two versions.

Hi,

I use a standard Wpf Checkbox inside a RadPanelBarItem. I bind the background to a dynamic color and this works well, but when the mouse is over the box the background back to white, I would like that still remains of the assigned color.
Thank you in advance
Luigi

P.S:
Here the useful part of xaml (nothing in code behind)

<DataTemplate x:Key="PanelBarSorgentiTemplate">
			<StackPanel Orientation="Horizontal"  >				
				<CheckBox Margin="10 5 5 5" VerticalAlignment="Center"
						  IsChecked="{Binding IsChecked}"
						  Background="{Binding Color, Converter={StaticResource ColorToBrush}}"
						  
						  />
				<TextBlock Text="{Binding Name}"
						   VerticalAlignment="Center" />

			</StackPanel>
		</DataTemplate>
		
<t:RadPanelBarItem Header="{DynamicResource ResourceKey={x:Static l:ResourcesKeys.StatisticheVisualizzate}}"
							   ItemsSource="{Binding TabRisultati.StatisticheVisualizzate}"
							   ItemTemplate="{StaticResource PanelBarSorgentiTemplate}"
							   Visibility="{Binding IsTabStatisticaSelected, Converter={StaticResource BoolToVis}}"
							   IsExpanded="True"/>

Hello.

I am using RadImageEditor.

I'm done with the setup. It actually works too.

But when I shift + wheel, not only horizontal movement but also vertical scrolling.

I want to move only horizontal scrolling when shift is pressed.

Which part should I control?

<telerik:RadImageEditor x:Name="xImageEditor" Image="{Binding RadImage}" behaviour:HorizontalScrollViewerHelper.IsShiftWheelProperty="True" IsPanningEnabled="True"/>
<imageEditor:ZoomController ImageEditor="{Binding ElementName=xImageEditor}" HorizontalAlignment="Right" VerticalAlignment="Bottom"/>

public static class HorizontalScrollViewerHelper
    {
        public static bool GetIsShiftWheelProperty(DependencyObject obj) => (bool)obj.GetValue(IsShiftWheelProperty);
        public static void SetIsShiftWheelProperty(DependencyObject obj, bool value) => obj.SetValue(IsShiftWheelProperty, value);

        public static readonly DependencyProperty IsShiftWheelProperty
            = DependencyProperty.RegisterAttached("IsShiftWheel",
                typeof(bool),
                typeof(HorizontalScrollViewerHelper),
                new PropertyMetadata(false, HorizontalScrollCallback));

        private static void HorizontalScrollCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var imageEditor = d as RadImageEditor;
            imageEditor.PreviewMouseWheel += ImageEditor_PreviewMouseWheel;
        }

        private static void ImageEditor_PreviewMouseWheel(object sender, MouseWheelEventArgs e)
        {
            if (((RadImageEditor)sender).ChildrenOfType<ScrollViewer>().FirstOrDefault() is ScrollViewer scrollViewer)
            {
                if(Keyboard.Modifiers.Equals(ModifierKeys.Shift))
                {
                    if (e.Delta < 0)
                    {
                        scrollViewer.LineRight();
                    }
                    else
                    {
                        scrollViewer.LineLeft();
                    }
                    //scrollViewer.ScrollToHorizontalOffset(scrollViewer.HorizontalOffset + (-e.Delta / 300));
                }
            }
        }
    }

Thanks.

I am looking for a way to implement an endless / infinite scroll in my RadGridView.

I have only found this very outdated blog post

https://www.telerik.com/blogs/wpf-how-to-endless-scrolling-of-2mil-records-using-backgroundworker-and-linq-to-sql

I also found some endless paging approach but I do not want to page, but instead to load more and more data when users scrolls to the end of the RadGridView.

For example,

I am calling a WebService and getting items from range 0 to 10, I populate my RadGridView with those items, when the user scrolls to the end, I want to hit my WebService again and fetch items from range 10 to 20 and load those into my RadGridView (now currently holding 20 items in total), than again user scroll to end, I once again hit WebServce fetch items from range 20 to 30, load those into my RadGridView...

This cycle can be repeated till the point my WebService delivers no data from a range.

Looking at other technologies, this seems to be what I am looking for

https://demos.telerik.com/kendo-ui/grid/endless-scrolling-local

https://demos.telerik.com/kendo-ui/grid/endless-scrolling-remote 

Though, I would prefer a solution where the total count can be unknown, and grid just tries to get new data everytime, untill it reaches the point where no data can be delivered, instead of knowing before hand how many items there may be

Hi

I'm trying to put together a diagram sample. I based it on this: https://www.telerik.com/forums/issue-in-copy-and-paste-diagram-items as the report was about a stack trace similar to the one I'm experiencing and trying to track down: 

System.ArgumentNullException
  HResult=0x80004003
  Message=Value cannot be null.
Parameter name: dataObject
  Source=Telerik.Windows.Controls.Diagrams
  StackTrace:
	at Telerik.Windows.Controls.Diagrams.DataTransferService.HandleDiagramElementDrop(DataObject dataObject)

It builds fine but when I run it, I get an empty window, even if I click on the launch button. I can see no errors at runtime. I've attached a ZIP file of the project.

Hi,

I'm developing an application that will support scripting in it, so SyntaxEditor seems to be the perfect control to allow users to write there own script. But...

I tried to populate intelliprompts using this article (WPF SyntaxEditor | IntelliPrompts | Telerik UI for WPF) but with no success.

Do you have a full example not only an extract? In which event I populate the overlad list?

Thank's for any help.