Questions on UI for WPF Forum

1 answer

113 views

Pass Cell.BackColor to other Grid View in other Form.

In Form1 I take the BackColor with RadColor Dialog and in the second Form I use a ConditionalFormattingObject. How do I pass the Cell.BackColor of the first Form to the Form2?

GridView

answered on 04 Oct 2019

1 answer

286 views

Filter doesn't work with generic class

Hi Telerik,

I'mu using a base class with all proerties which are overridable :

Public Class SelectionDetailItemViewModel

Inherits ViewModelBase

Public Overridable Property Children As New ObservableCollection(Of SelectionDetailItemViewModel)

Public Overridable Property Reference As String

Public Overridable Property Name As String

'Other properties .....

I have 2 classes A & B which inherit of SelectionDetailItemViewModel. A class has children of type of A & B.

The ItemSource is bound to a ObservableCollection(Of SelectionDetailItemViewModel). For each column, the filter panel has all column values but select a value doesn't filter the RadTreeListView. There the following error :

System.Windows.Data Error: 8 : Cannot save value from target back to source. BindingExpression:Path=IsActive; DataItem='DistinctValueViewModel' (HashCode=63240628); target element is 'CheckBox' (Name=''); target property is 'IsChecked' (type 'Nullable`1') ArgumentException:'System.ArgumentException: La valeur "((Name IsEqualTo er 2d2 MC)) AND ((Name IsEqualTo <Unset>) AND (Name IsEqualTo <Unset>))" n'est pas de type "Telerik.Windows.Data.IFilterDescriptor" et ne peut pas être utilisée dans cette collection générique.
Nom du paramètre : value
à System.ThrowHelper.ThrowWrongValueTypeArgumentException(Object value, Type targetType)
à System.Collections.ObjectModel.Collection`1.System.Collections.IList.Insert(Int32 index, Object value)
à Telerik.Windows.Data.CollectionHelper.Insert(IList target, IEnumerable newItems, Int32 startingIndex, IEqualityComparer itemComparer)
à Telerik.Windows.Data.ObservableCollectionManager.HandleCollectionChanged(IList sender, NotifyCollectionChangedEventArgs args)
à Telerik.Windows.Data.ObservableCollectionManager.Telerik.Windows.Data.IWeakEventListener<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.ReceiveWeakEvent(Object sender, NotifyCollectionChangedEventArgs args)
à Telerik.Windows.Data.WeakEvent.WeakListener`1.Handler(Object sender, TArgs args)
à System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)
à System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
à Telerik.Windows.Data.RadObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
à Telerik.Windows.Data.ObservableItemCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)
à System.Collections.ObjectModel.ObservableCollection`1.InsertItem(Int32 index, T item)
à Telerik.Windows.Data.RadObservableCollection`1.InsertItem(Int32 index, T item)
à Telerik.Windows.Data.FilterDescriptorCollection.InsertItem(Int32 index, IFilterDescriptor item)
à System.Collections.ObjectModel.Collection`1.Add(T item)
à Telerik.Windows.Controls.GridViewColumn.OnColumnFilterDescriptorPropertyChanged(Object sender, PropertyChangedEventArgs e)
à Telerik.Windows.Data.DescriptorBase.OnPropertyChanged(PropertyChangedEventArgs args)
à Telerik.Windows.Data.DescriptorBase.OnPropertyChanged(String propertyName)
à Telerik.Windows.Data.DescriptorBase.ResumeNotifications()
à Telerik.Windows.Controls.GridView.FilteringViewModel.ApplyFilters()
à Telerik.Windows.Controls.GridView.FilteringViewModel.OnDistinctValuesChanged()
à Telerik.Windows.Controls.GridView.FilteringViewModel.OnDistinctValuesItemChanged(Object sender, ItemChangedEventArgs`1 e)
à Telerik.Windows.Data.ObservableItemCollection`1.RaiseGenericItemChanged(ItemChangedEventArgs`1 e)
à Telerik.Windows.Data.ObservableItemCollection`1.OnItemChanged(ItemChangedEventArgs`1 e)
à Telerik.Windows.Data.ObservableItemCollection`1.Telerik.Windows.Data.IWeakEventListener<System.ComponentModel.PropertyChangedEventArgs>.ReceiveWeakEvent(Object sender, PropertyChangedEventArgs args)
à Telerik.Windows.Data.WeakEvent.WeakListener`1.Handler(Object sender, TArgs args)
à System.ComponentModel.PropertyChangedEventHandler.Invoke(Object sender, PropertyChangedEventArgs e)
à Telerik.Windows.Controls.ViewModelBase.OnPropertyChanged(String propertyName)
à Telerik.Windows.Controls.GridView.DistinctValueViewModel.set_IsActive(Boolean value)'

Have you got any idea ?

Thanky you.

TreeListView

answered on 04 Oct 2019

3 answers

1.4K+ views

DataBinding to String

The data binding of the RadRichTextBox does not work. What am I wrong about?

Document Class:

01.public class Document : INotifyPropertyChanged

02.{

03. private Guid _id = Guid.NewGuid();

04. private string _title = "New Document";

05. private string _description

06. ....

07. public string Description

08. {

09. get { return _description; }

10. set

11. {

12. _description = value;

13. NotifyPropertyChanged("Description");

14. }

15. }

16.}

RadRichTextBox in XAML:

01.<telerik:WizardPage x:Name="DescriptionPage" HeaderTemplate="{StaticResource headerTemplate}" BorderThickness="0">

02.....

03. <telerik:RadRichTextBox x:Name="DocumentDescriptionTextBox" Grid.Row="2" Grid.Column="1" Margin="10" Height="200"

04. IsSpellCheckingEnabled="True"

05. IsContextMenuEnabled="True"

06. IsSelectionMiniToolBarEnabled="False"

07. IsImageMiniToolBarEnabled="False"

08. AllowScaling="False"

09. DocumentInheritsDefaultStyleSettings="True"

10. PreviewEditorKeyDown="RichTextBox_PreviewEditorKeyDown"/>

11. <telerik:TxtDataProvider RichTextBox="{Binding ElementName=DocumentDescriptionTextBox}"

12. Text="{Binding Path=Description, Mode=TwoWay}"/>

13.....

14.</telerik:WizardPage>

Assignment of the DataContext:

1.....

2.this.DescriptionPage.DataContext = _document;

3.....

RichTextBox

answered on 04 Oct 2019

13 answers

598 views

Adaptive Sampling + Zoom + Scrolling

Hello Telerik,

Currently I'm evaluating RadChartView control for task of rendering huge data collections (millions of points) as line charts.
I need the following chart behavior:
- show brief charts when no Zoom
- show precise charts when Zoom is on (greater precise for greater zoom values)
- scrolling should work always on all data (no input data cut is possible though)
- everything should work relatively fast (especially on scrolling)

I know how to achieve part of requirements using ChartDataSource, but I can't understand if it's possible to implement such dynamic adaptive data sampling on zooming and with proper scrolling support.

Could you please advise if it's possible? Is this feature planned? Can it be done using RadChart instead of RadChartView (with good performance on millions of raw data objects)?

Thanks.

ChartView

answered on 04 Oct 2019

1 answer

311 views

.Net Core and Telerik Toolbox Items

Hi,

I tacked this message onto an old thread and realized, 3 days later, that might not be the wisest course. Hi Martin,

Just updated my VS to the Net Core 3.0 release. Also updated Telerik. But I cannot get the Telerik Controls to show up in the toolbox when I create a Core project, despite following the installation instructions including manual installation. Note, everything works fine if I create a .NET Framework project

Any thoughts?

Wayne

Installer and Visual Studio Extensions

answered on 04 Oct 2019

3 answers

129 views

Adjust undo granularity?

The undo stack for editing in the rich text box is way too high. Even when typing very quickly with no pauses whatsoever, it has a separate entry for nearly every single letter. Word (and even WordPad) does a much better job at this, only breaking up entries if you pause. Is there any way to adjust this?

RichTextBox

answered on 03 Oct 2019

2 answers

247 views

Remove outer border of PieChart

Hi,

I am building a multi layered pie chart (by stacking charts).

I would like to remove the border - but I do not want to remove the border between individual pieces.

Code:

ChartView

answered on 02 Oct 2019

1 answer

131 views

After setting "AlternationCount", the drag is stopped working for alternate rows.

Hello,

In our application, when we set the "AlternationCount", the alternate rows stopped dragging. If I remove the AlternationCount then all the rows start dragging.

I have demo project showcasing the behavior, but I can not upload that here.

Kindly let me know if you able to reproduce this issue at your end ?

Thanks,

Parthiv

GridView

answered on 02 Oct 2019

1 answer

806 views

Custom row template with editable controls

Hi, my original issue is as following: I have a collection of Objects to be shown in a Grid; each Object has many individual properties that are editable by user. If I show each property as individual column (straight forward solution) then I end up with tens of columns and a very long horizontal scroll bar – very cumbersome view to inspect and work with data.

I am experimenting with custom row layout as an alternative solution. I declared a few columns (only fields I expect user to sort over) then the rest of the properties will be shown below in the custom layout. Here is a simplified example:

<telerik:RadGridView ItemsSource="{Binding Items}"

CanUserSelect="True" ShowGroupPanel="False" AutoGenerateColumns="False" CanUserFreezeColumns="False"

CanUserInsertRows="False" CanUserDeleteRows="False" RowIndicatorVisibility="Collapsed" IsFilteringAllowed="False"

SelectionMode="Extended"

RowStyle="{StaticResource MyRowStyle}">

<telerik:RadGridView.Columns>

<telerik:GridViewDataColumn Header="Name" DataMemberBinding="{Binding Name}" Width="75" IsReadOnly="True">

<telerik:GridViewDataColumn Header="Quantity" DataMemberBinding="{Binding Quantity}" Width="50">

<telerik:GridViewDataColumn Header="Price" DataMemberBinding="{Binding Price}" Width="55">

</telerik:RadGridView.Columns>

</telerik:RadGridView>

<Style x:Key="MyRowStyle" TargetType="telerik:GridViewRow">

<Setter Property="Template">

<Setter.Value>

<ControlTemplate TargetType="telerik:GridViewRow">

<Border x:Name="rowsContainer"

Background="{TemplateBinding Background}"

Padding="0,0,0,3">

<StackPanel Orientation="Vertical">

<telerik:DataCellsPresenter x:Name="PART_DataCellsPresenter" IsTabStop="False" BorderThickness="0"/>

<Grid Margin="15,3,0,0">

<Grid.ColumnDefinitions>

<ColumnDefinition Width="Auto"/>

<ColumnDefinition Width="8"/>

<ColumnDefinition Width="Auto" MinWidth="100"/>

</Grid.ColumnDefinitions>

<Grid.RowDefinitions>

<RowDefinition Height="Auto"/>

<RowDefinition Height="1"/>

<RowDefinition Height="Auto"/>

<RowDefinition Height="1"/>

<RowDefinition Height="Auto"/>

</Grid.RowDefinitions>

<TextBlock Grid.Row="0" Grid.Column="0" Text="Title"/>

<TextBlock Grid.Row="2" Grid.Column="0" Text="Event Name"/>

<TextBlock Grid.Row="4" Grid.Column="0" Text="Weight"/>

<TextBox Grid.Row="0" Grid.Column="2"

Text="{Binding Title, UpdateSourceTrigger=PropertyChanged}"

MaxLength="30"/>

<TextBox Grid.Row="2" Grid.Column="2"

Text="{Binding EventName, UpdateSourceTrigger=PropertyChanged}"

MaxLength="30"/>

<TextBox Grid.Row="4" Grid.Column="2"

Text="{Binding Weight, UpdateSourceTrigger=PropertyChanged}"

MaxLength="20"/>

</Grid>

</StackPanel>

</Border>

<ControlTemplate.Triggers>

<Trigger Property="IsMouseOver" Value="True">

<Setter Property="Background" TargetName="rowsContainer" Value="{StaticResource GridRowHighlightBrush}"/>

</Trigger>

<Trigger Property="IsSelected" Value="True">

<Setter Property="Background" TargetName="rowsContainer" Value="{StaticResource SelectedItemBrush}"/>

</Trigger>

</ControlTemplate.Triggers>

</ControlTemplate>

</Setter.Value>

</Setter>

</Style>

I used DataCellsPresenter to show properties defined as columns properly aligned with respective column headers. The rest of the properties are show through individual editors laid out below.

All works well except for two issues:

Scenario: User starts editing value in “Quantity” column of the grid and then clicks mouse over “Title” textbox.

Issue #1 Keyboard focus shifts over to “Title” textbox but the cell in “Quantiy” column still stays in edit more.
Issue #2 If user click over “Title” textbox in a different row then that row doesn’t become selected.

Any suggestions?

GridView

answered on 02 Oct 2019

4 answers

164 views

ControlTemplate applied to CarouselItem style

Hi Telerik,

I'mu using a RadCarousel with a style applied to all Carousel Items. Sometimes, and randomly, the picture in the Carousel Item disappears (the border or the overlay are still present).

My Carousel :

<telerik:RadCarousel Grid.Column="1" x:Name="InspectionCarousel" ItemsSource="{Binding TabDiagramsForActiveInspection}" AutoGenerateDataPresenters="False"

Background="Transparent" VerticalScrollBarVisibility="Hidden" HorizontalScrollBarVisibility="Hidden" SelectedItem="{Binding SelectedItem}">

<telerik:RadCarousel.ItemsPanel>

<ItemsPanelTemplate>

<telerik:RadCarouselPanel Path="{StaticResource horizontalPath}"/>

</ItemsPanelTemplate>

</telerik:RadCarousel.ItemsPanel>

</telerik:RadCarousel>

My Carousel Item Style :

<Style TargetType="telerik:CarouselItem">

<Setter Property="HorizontalAlignment" Value="Stretch"/>

<Setter Property="VerticalAlignment" Value="Stretch"/>

<Setter Property="Height" Value=

"{Binding Path=ActualHeight, ElementName=InspectionCarousel, Converter={conv:PercentageConverter}, ConverterParameter='0,9'}"

/>

<Setter Property="Template">

<Setter.Value>

<ControlTemplate TargetType="telerik:CarouselItem">

<Grid>

<Border BorderThickness="5" CornerRadius="4" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">

<Grid HorizontalAlignment="Stretch" VerticalAlignment="Stretch">

<Image Source="{Binding TabDiagram.DiagramAsImage.SerializedImage, Converter={StaticResource ImageConverter}}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch"/>

<Grid>

<Grid.Style>

<Style TargetType="Grid">

<Setter Property="Visibility" Value="Collapsed"/>

<Style.Triggers>

<DataTrigger Binding="{Binding State}" Value="{x:Static vm:InspectionState.NA}">

<Setter Property="Visibility" Value="Visible"/>

</DataTrigger>

</Style.Triggers>

</Style>

</Grid.Style>