Questions on UI for WPF Forum

1 answer

523 views

Expanding and collapsing a card when item source changed

Hello,

I want programmatically expand/collapse cards when the item source of the card view changed.

Can you advise me an event to do that?

regards,

Tobias

CardView

answered on 02 Mar 2022

2 answers

105 views

How to Select Multi Items in Hierarchy?

Hello.

An example of Select Single Item in Hierarchy in GridView is in SDK.

I changed the xaml property 'SelectionMode' but it didn't work.

How do I solve this?

And is it possible to change it with mvvm? I have to use other views as well.

Thanks.

GridView

answered on 02 Mar 2022

0 answers

107 views

Dragging Geometry

Hi,

Lokking for a way to drag a shape with hollow figure.

I want to know if it is possible to redefine the drag area(center) in RadDiagramShape with a container like function.

As a sample below, Want to drag an empty area(circle center) to the hollow circle

private void InitializeShapeModels()
{
this.ShapeModels = new ObservableCollection<ShapeGalleryItemViewModel>();
this.ShapeModels.Add(new ShapeGalleryItemViewModel(){ CustomGeometry = ShapeFactory.CommonGeometries[CommonShapeType.EllipseShape]});
GeometryGroup ellipses = new GeometryGroup();
ellipses.Children.Add( new EllipseGeometry(new Point(50, 50), 50, 50));
ellipses.Children.Add( new EllipseGeometry(new Point(50, 50), 45, 45));

Geometry emptyellipses = PathGeometry.CreateFromGeometry(ellipses);
this.ShapeModels.Add(new ShapeGalleryItemViewModel() { CustomGeometry = emptyellipses });
}

Diagram

DragAndDrop

asked on 02 Mar 2022

1 answer

221 views

RadDateTimePicker properties

Hi,

I want to know few of the properties which I was previously using in WPF Toolkit DateTimePicker and I am not able to find them in Telerik UI for WPF.

AllowSpin="False"
AllowTextInput="False"
Format="Custom"
AutoCloseCalendar="True"
FormatString="{Binding SiteShortDateTimeFormat, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay, FallbackValue='MMM-dd-yyyy HH:mm'}" IsEnabled="{Binding ExpirationEnabled}" Minimum="{Binding MinExpirationDate}" TimePickerVisibility="Collapsed"
Value="{Binding ExpirationDate, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"

These all I want in telerik.

Please help me in this if possible.

Thanks,

Yogendra

DateTimePicker

answered on 25 Feb 2022

2 answers

215 views

QueryableEntityCollectionView in .net 5.0

Hi

Actually we are megrating to .net 5.0. So we had been using the 2019 version of Telerik and now we want to use the 2021 version of Telerik.

But we had been using the QueryableEntityCollectionView which was present into Telerik.Windows.Data dll version 2019.1.220.45, but not anymore into the version 2021.2.615.50.

Could you tell me by wich class QueryableEntityCollectionView was replaced into the new version ?

Thanks

BR

J-Christophe

Accessibility

answered on 24 Feb 2022

0 answers

114 views

Bind OData Service to a PivotGrid

Hi,

I tried to use the RadGridView with an OData Endpoint.

I took a look into the documentations but didn't find any good sample.

I tried it with the QueryableDataProvider.

But my data was not loaded. It always runs into an exception:

Constructing or initializing instances of the type DynamicClass1 with the expression (Param_0 != null) is not supported.

This Exception is thrown by the OData Client.

Below my simplified code:

View:

<Window x:Class="ODataClientTest.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        xmlns:oDataClientTest="clr-namespace:ODataClientTest"
        xmlns:pivot="http://schemas.telerik.com/2008/xaml/presentation/pivot"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800"
        d:DataContext="{d:DesignInstance oDataClientTest:MainWindowViewModel}">
    <Grid>

        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>

        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="Auto" />
        </Grid.ColumnDefinitions>
        
        <pivot:RadPivotGrid Grid.Row="0" Grid.Column="0" DataProvider="{Binding ReportElements}" />
        
        <pivot:RadPivotFieldList Grid.Row="0" Grid.Column="1" DataProvider="{Binding ReportElements}" />

    </Grid>
</Window>

ViewModel

using System.Diagnostics;
using Telerik.Pivot.Queryable;

namespace ODataClientTest;

public class MainWindowViewModel : BaseNotifyPropertyChanged
{
    public MainWindowViewModel()
    {
        MyOdataContext dataContext = new();

        ReportElements = new()
                         {
                             Source = dataContext.ReportElements,
                             DeferUpdates = true
                         };

        ReportElements.StatusChanged += (sender, args) =>
                                        {
                                            if (args.Error != default)
                                                Debugger.Break(); // Here I can see the exception
                                        };
    }

    public QueryableDataProvider ReportElements
    {
        get => GetValue<QueryableDataProvider>();
        set => SetValue(value);
    }
}

My Question now: Is there any way to connect my OData Source to a PivotGrid?

Unfortunalety I could not use the LocalDataProvider, as the OData API returns a lot of data which must be filtered beforehand.

I also tried to use the normal GridView with works perfectly with the QueryableDataServiceCollectionView. But: It does not fit our needs, like Grouping, Creating dynamic aggregates (sum, average, etc.).

We are currently using .Net 4.7.2.

Many thanks!

DataServiceDataSource

GridView

PivotGrid

asked on 23 Feb 2022

1 answer

246 views

Bind GridViewColumnCollection to static resource

Hi,

As the title describes it, I'm trying to bind the property "Columns" of a RadGridView to a static resource (could also be bound to a dependency property).

But of course, since this "Columns" property doesn't have a public setter, I can't simply set it with:

<telerik:RadGridView Columns="{Binding InitialColumns}"/>

Nor can I do:

<telerik:RadGridView>
    <telerik:RadGridView.Columns Items="{Binding InitialColumns}"/>
</telerik:RadGridView>

since the "Items" property of Collection<T> doesn't have a public setter either.

As you may have guessed, I'm trying to add a collection of initial columns to the grid. My ultimate goal is to have a template selector that would fill the grid with some initial columns based on some conditions. The rest of the columns would then be added dynamically in code at runtime.

How could I do that? Thanks!

GridView

answered on 22 Feb 2022

1 answer

383 views

Highlight color in VisualStudio 2019 theme

In VS2019 theme the highlight color for selected text in several controls is so light that is very difficult to tell if the text is selected or not.

You can see this in controls like MS Textbox or RadWaterMarkTextbox,

It looks like that the color used is the accentcolor property of the theme with certain opacity. The problem is that i don't know how to change this opacity.

I'm attaching two screen captures showing this, both of them from Telerik Color Theme Generator.

How can I change this color?

Window

answered on 22 Feb 2022

2 answers

106 views

ScheduleView Timeline fill space

Hi guys,

I use a ScheduleView in Timeline Mode to display when users had vacations.
My problem now is, that the size of the Timeline-Area with the columns doesn't grow.
If the available space is smaller a scrollbar appears (what is good).
But if the available space is bigger, the columns get smaller instead that the space is used.
I tried to play with the MaxTimeRulerExtent property but this doesn't seem to have an effect.

Is there something I'm missing?

Greetings Benedikt

ScheduleView

answered on 22 Feb 2022

0 answers

108 views

Exception on OnAutoGenerateColumnsChanged of GridViewDataControl

Hello Support team.
We got following exception on changing ItemCollection property of a custom control.

Version
Assembly Telerik.Windows.Controls, Version=2022.1.117.45, Culture=neutral, PublicKeyToken=5803cfa389c90ce7

Message
System.NullReferenceException: 'Object reference not set to an instance of an object.'

StackTrace

   at Telerik.Windows.Controls.GridView.Selection.CellInfoCollectionCellValidator.IsPublicCellValid(GridViewCellInfo info)
   at Telerik.Windows.Controls.GridView.Selection.CellInfoCollection.Add(GridViewCellInfo cellInfo)
   at Telerik.Windows.Controls.GridView.Selection.CellSelectionHandler.CoerceSelectedCellsIfNeeded(NotifyCellInfoCollectionChangedEventArgs e)
   at Telerik.Windows.Controls.GridView.Selection.CellSelectionHandler.InternalSelectedCells_CellsChanged(Object sender, NotifyCellInfoCollectionChangedEventArgs e)
   at Telerik.Windows.Controls.GridView.Selection.CellInfoCollection.OnCellsChanged(CellInfoCollectionChangeType changeType, CellInfoCollection addedCells, CellInfoCollection removedCells)
   at Telerik.Windows.Controls.GridView.Selection.CompositeSelectionHandler.UpdateSelectedCells(IList`1 items, Boolean isSelected)
   at Telerik.Windows.Controls.GridView.Selection.CompositeSelectionHandler.OnColumnsCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)
   at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
   at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   at Telerik.Windows.Controls.GridViewColumnCollectionInternal.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
   at System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)
   at Telerik.Windows.Controls.GridViewColumnCollectionInternal.InsertItem(Int32 index, GridViewColumn item)
   at Telerik.Windows.Controls.GridView.GridViewDataControl.AddAutoGeneratedColumns()
   at Telerik.Windows.Controls.GridView.GridViewDataControl.OnAutoGenerateColumnsChanged(DependencyObject dependencyObject, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp, Boolean preserveCurrentValue)
   at System.Windows.StyleHelper.InvalidatePropertiesOnTemplateNode(DependencyObject container, FrameworkObject child, Int32 childIndex, FrugalStructList`1& childRecordFromChildIndex, Boolean isDetach, FrameworkElementFactory templateRoot)
   at System.Windows.StyleHelper.ClearTemplateChain(HybridDictionary[] instanceData, FrameworkElement feContainer, FrameworkContentElement fceContainer, List`1 templateChain, FrameworkTemplate oldFrameworkTemplate)
   at System.Windows.StyleHelper.ClearGeneratedSubTree(HybridDictionary[] instanceData, FrameworkElement feContainer, FrameworkContentElement fceContainer, FrameworkTemplate oldFrameworkTemplate)
   at System.Windows.StyleHelper.DoTemplateInvalidations(FrameworkElement feContainer, FrameworkTemplate oldFrameworkTemplate)
   at System.Windows.Controls.Control.OnTemplateChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp, Boolean preserveCurrentValue)
   at System.Windows.StyleHelper.InvalidateContainerDependents(DependencyObject container, FrugalStructList`1& exclusionContainerDependents, FrugalStructList`1& oldContainerDependents, FrugalStructList`1& newContainerDependents)
   at System.Windows.StyleHelper.DoStyleInvalidations(FrameworkElement fe, FrameworkContentElement fce, Style oldStyle, Style newStyle)
   at System.Windows.StyleHelper.UpdateStyleCache(FrameworkElement fe, FrameworkContentElement fce, Style oldStyle, Style newStyle, Style& styleCache)
   at System.Windows.FrameworkElement.OnStyleChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args)
   at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType)
   at System.Windows.DependencyObject.InvalidateProperty(DependencyProperty dp, Boolean preserveCurrentValue)
   at System.Windows.FrameworkElement.UpdateStyleProperty()
   at System.Windows.FrameworkElement.InvalidateTreeDependentProperties(TreeChangeInfo parentTreeState, Boolean isSelfInheritanceParent, Boolean wasSelfInheritanceParent)
   at System.Windows.FrameworkElement.OnAncestorChangedInternal(TreeChangeInfo parentTreeState)
   at System.Windows.TreeWalkHelper.OnAncestorChanged(DependencyObject d, TreeChangeInfo info, Boolean visitedViaVisualTree)
   at System.Windows.DescendentsWalker`1._VisitNode(DependencyObject d, Boolean visitedViaVisualTree)
   at MS.Internal.PrePostDescendentsWalker`1._VisitNode(DependencyObject d, Boolean visitedViaVisualTree)
   at System.Windows.DescendentsWalker`1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren)
   at System.Windows.DescendentsWalker`1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren)
   at System.Windows.DescendentsWalker`1.IterateChildren(DependencyObject d)
   at System.Windows.DescendentsWalker`1._VisitNode(DependencyObject d, Boolean visitedViaVisualTree)
   at MS.Internal.PrePostDescendentsWalker`1._VisitNode(DependencyObject d, Boolean visitedViaVisualTree)
   at System.Windows.DescendentsWalker`1.WalkLogicalChildren(FrameworkElement feParent, FrameworkContentElement fceParent, IEnumerator logicalChildren)
   at System.Windows.DescendentsWalker`1.WalkFrameworkElementLogicalThenVisualChildren(FrameworkElement feParent, Boolean hasLogicalChildren)
   at System.Windows.DescendentsWalker`1.IterateChildren(DependencyObject d)
   at System.Windows.DescendentsWalker`1.StartWalk(DependencyObject startNode, Boolean skipStartNode)
   at MS.Internal.PrePostDescendentsWalker`1.StartWalk(DependencyObject startNode, Boolean skipStartNode)
   at System.Windows.TreeWalkHelper.InvalidateOnTreeChange(FrameworkElement fe, FrameworkContentElement fce, DependencyObject parent, Boolean isAddOperation)
   at System.Windows.FrameworkElement.OnVisualParentChanged(DependencyObject oldParent)
   at System.Windows.Media.Visual.FireOnVisualParentChanged(DependencyObject oldParent)
   at System.Windows.Media.Visual.RemoveVisualChild(Visual child)
   at System.Windows.Media.VisualCollection.DisconnectChild(Int32 index)
   at System.Windows.Media.VisualCollection.RemoveRange(Int32 index, Int32 count)
   at System.Windows.Controls.UIElementCollection.RemoveRangeInternal(Int32 index, Int32 count)
   at System.Windows.Controls.Panel.OnItemsChangedInternal(Object sender, ItemsChangedEventArgs args)
   at System.Windows.Controls.Panel.OnItemsChanged(Object sender, ItemsChangedEventArgs args)
   at System.Windows.Controls.ItemContainerGenerator.OnItemRemoved(Object item, Int32 itemIndex)
   at System.Windows.Controls.ItemContainerGenerator.OnCollectionChanged(Object sender, NotifyCollectionChangedEventArgs args)
   at System.Windows.WeakEventManager.ListenerList`1.DeliverEvent(Object sender, EventArgs e, Type managerType)
   at System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)
   at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
   at System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
   at System.Windows.WeakEventManager.ListenerList`1.DeliverEvent(Object sender, EventArgs e, Type managerType)
   at System.Windows.WeakEventManager.DeliverEvent(Object sender, EventArgs args)
   at System.Windows.Data.CollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)
   at MS.Internal.Controls.InnerItemCollectionView._RemoveAt(Int32 index, Int32 indexR, Object item)
   at System.Windows.Controls.ItemCollection.Remove(Object removeItem)

GridView

asked on 21 Feb 2022