Dear Telerik,

I encountered pretty weird behavior  while using VirtualQueryableCollectionView+grid.

I have  a grid and a simple combobox for filtering. When I select a value in the combobox everything works as expected:

-- selected combobox value changed

-- handle property change event in the model

-- set collection total and reload required page

However if i click any cell I can see that virtual collection reloads ALL the pages. I attached a small repro u can play with.

Scenario 1: start the app - select a unit from the combobox - click any cell (e.g. top left cell) - check the output

Scenario 2: start the app - click the button - click any cell (e.g. top left cell) - check the output

-- 

Here is the xaml

<Window x:Class="WpfApplication1.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        Title="MainWindow" Height="350" Width="525" WindowStartupLocation="CenterScreen">

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

</Grid.RowDefinitions>

<telerik:RadButton Content="reload" HorizontalAlignment="Left" Margin="2" Command="{Binding ReloadCommand}" />

<telerik:RadComboBox  ItemsSource="{Binding Units}" HorizontalAlignment="Right" Margin="2"
EmptyText="select unit" SelectedItem="{Binding Unit, Mode=TwoWay}"/>

<telerik:RadGridView  AutoGenerateColumns="False" ShowGroupPanel="False" 
ItemsSource="{Binding Data}" Grid.Row="1" IsReadOnly="True"  >
<telerik:RadGridView.Columns>

<telerik:GridViewDataColumn DataMemberBinding="{Binding RowNo}" Header="row no" />

</telerik:RadGridView.Columns>
</telerik:RadGridView>
</Grid>
</Window>

Here is the model

#region Usings
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Windows.Input;
using Telerik.Windows.Data;
#endregion

namespace WpfApplication1
{
public class Model
{
#region Class constants
private const int PAGE_SIZE = 100;
#endregion

#region Class members
private UnitType _unit;
protected VirtualQueryableCollectionView _data;
#endregion

#region Class properties
public IEnumerable<UnitType> Units
{
get
{
return Enum
.GetValues( typeof( UnitType ) )
.Cast<UnitType>()
.ToList();
}
}
public UnitType Unit 
{
get 
{
return _unit;
}
set 
{
_unit = value;

LoadHistory();
}
}
public VirtualQueryableCollectionView Data
{
get
{
return _data;
}
}
public CommandHandler ReloadCommand { get; set; }
#endregion

#region Class initialization
public Model() 
{
_data = new VirtualQueryableCollectionView()
{
LoadSize = 100
};

_data.ItemsLoading += ( o, ea ) => OnNeedDataPage( ea.StartIndex / _data.LoadSize );

ReloadCommand = new CommandHandler( x => LoadHistory(), true );
}
#endregion

#region Class event handlers
private void LoadHistory()
{
_data.ResetItems();
LoadHistory( 0 );
}
protected void OnNeedDataPage( int iPageIndex )
{

LoadHistory( iPageIndex );
}
private void LoadHistory( int iPageIndex )
{
var iTotalCount = 1000;
Debug.WriteLine( "load glass history page: " + iPageIndex );

if( iTotalCount != _data.VirtualItemCount )
{
_data.VirtualItemCount = iTotalCount;
}

int iStartIndex = iPageIndex * PAGE_SIZE;
var list = new List<TestData>();

for( int i = iPageIndex * PAGE_SIZE; i < iPageIndex * PAGE_SIZE + PAGE_SIZE; ++i )
{
list.Add( new TestData() { RowNo = i } );
}

_data.Load( iStartIndex, list );
}
#endregion

#region Class internal structs
public enum UnitType 
{
none,
a,
b
}
public class TestData
{
public int RowNo { get; set; }
}
#endregion
}

public class CommandHandler:ICommand
{
#region Class members
protected Action<object> _action;
protected bool _canExecute;
#endregion

#region Class events
public event EventHandler CanExecuteChanged;
public void FireCanExecuteChanged( bool b )
{
_canExecute = b;

if( null != CanExecuteChanged )
{
CanExecuteChanged( this, EventArgs.Empty );
}
}
#endregion

#region Class initialization
public CommandHandler( Action<object> action, bool canExecute )
{
_action = action;
_canExecute = canExecute;
}
#endregion

#region Class public methods
public bool CanExecute( object parameter )
{
return _canExecute;
}
public void Execute( object parameter )
{
_action( parameter );
}
#endregion
}
}

Hello everyone,

I'm currently stucked with the following situation.

I'm generating via a ViewModel the shapes for my toolbox. This is done via a property binding.

On the right side of the toolbox there is my diagram, which initially loads an existing workflow.

Now the problem is, that when dragging a shape from the toolbox to the diagram the dropped shape doesn't have any information about the node properties I gave it (in this case TreeId, ProcessId, CostCenter, Description are all Nothing).
As the documentation says, I need to serialize my custom properties, so that the diagram recognizes them.
The initially loaded workflow to the diagram is done via a GraphSource, which works perfectly (with the same node properties from above). In the GraphSource class I have those SerializeNode and DeserializeNode methods overriden.
But for the toolbox the nodes aren't in a graph source but added directly to the gallery and then to the gallerycollection (see code snippet above).

This might be the problem.
Is it possible to create the nodes, add them to a graph source object and then add them to the toolbox gallery?

Otherwise, how can I achieve, that when dragging the shape (initially created with the node and custom properties) from the toolbox to my diagram, that the node behind the shape has the custom property values I've initially set. Maybe the node properties are already lost, when the shapes are loaded into the toolbox?

I've read the following documentations without success :-(
- http://docs.telerik.com/devtools/wpf/controls/raddiagram/howto/drag-custom-toolboxitem

- http://docs.telerik.com/devtools/wpf/controls/raddiagram/features/raddiagrams-serialization#manual-serializationdeserialization

- http://docs.telerik.com/devtools/wpf/controls/raddiagram/extensions/toolbox#how-to-populate-raddiagramtoolbox-with-custom-data-items

Any hints and maybe short examples are very welcome

Can somebody point me towards examples for initializing the child/parent relationship for diagram nodes derived from HierarchicalNodeViewModel? This example code from the MVVM serialization example (http://docs.telerik.com/devtools/wpf/controls/raddiagram/howto/raddiagrams-serialize-databound-diagram) results in a Children property with 0 entries for the rootNode:

Manually setting the children doesn't seem straighforward, either: Even though the doc for the HierarchicalNodeViewModel.Children property reads "Gets or sets the children of the current node", the property only has a getter and no setter:

So I often use the BusyIndicator in my application to provide a nicely styled modal window with overlay. I am attempting to add a BusyIndicator to a view that already has 5 others set up to cover the whole view. They are not nested; they all cover the same grid rowspan. I copied the code from another already on the page and gave it a new name. I can't see any difference in the code.

For some reason this new busy indicator is blocking access to my view while it is set to IsBusy="False". It is not applying the styled colour overlay or showing the modal itself, but I can't click on any buttons or interact with the screen at all.

    <Grid x:Name="LayoutRoot" Background="White" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" >
        <Grid.RowDefinitions>
            <RowDefinition Height="auto"/>
            <RowDefinition Height="auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>

        <telerik:RadBusyIndicator Grid.RowSpan="4" x:Name="SecurityAnswers" IsBusy="False" OverlayStyle="{StaticResource BusyIndicator_OverlayStyle}" ProgressBarStyle="{StaticResource BusyNoProgress}">
            <telerik:RadBusyIndicator.BusyContent>
                <StackPanel>
                    <!-- This is the indicator that works perfectly. There are 5 similar to this one that all work fine. -->
                </StackPanel>
            </telerik:RadBusyIndicator.BusyContent>
        </telerik:RadBusyIndicator>

        <telerik:RadBusyIndicator Grid.RowSpan="4" x:Name="SelectUserLocation" IsBusy="False" OverlayStyle="{StaticResource BusyIndicator_OverlayStyle}" ProgressBarStyle="{StaticResource BusyNoProgress}" >
            <telerik:RadBusyIndicator.BusyContent>
                <Grid >
                    <!-- this is the indicator that is causing the problems! I can't see anything to explain the different behaviour -->
                </Grid>
            </telerik:RadBusyIndicator.BusyContent>>
        </telerik:RadBusyIndicator>
    </Grid>

I have moved the offending BusyIndicator above and below the others, and I have removed all the others to see if there was an issue due the number of indicators on the screen. Even if its the only BusyIndicator on the screen, it still blocks the screen while not busy!

I have also tried removing the styles, the problem continues. The only thing that solves the problem is removing that one BusyIndicator

Any insight into this issue would be greatly appreciated! thanks

I have a complex template defining the RadPanelBar & RadPanelBarItem. I want to have these items be virtualized as I expect there to be about 1000 items and it takes enormous amount of time for my screen to load.

I know that RadPanelBar did not support virtualization previously, but is there a way to do it now? Below is my control template

------------------------------------------------------------------------------------------------------------------------------------------------------

<this:RadPanelBar x:Name="ContainerBar"
                                    Grid.Row="1"
                                    ItemsSource="{Binding Path=TheCollection}"
                                    HorizontalAlignment="Stretch"
                                    Background="{StaticResource StrongestBrush}"
                                    Orientation="Vertical"
                                    ExpandMode="Multiple"
                                    SelectionMode="Multiple">
                    <telerik:RadPanelBar.ItemContainerStyle>
                        <Style TargetType="this:RadPanelBarItem"
                               BasedOn="{StaticResource ResourceKey={x:Type this:RadPanelBarItem}}">
                            <Setter Property="IsExpanded"
                                    Value="{Binding Path=IsExpanded,
                                                Mode=TwoWay}" />
                        </Style>
                    </telerik:RadPanelBar.ItemContainerStyle>
                    <telerik:RadPanelBar.ItemTemplate>
                        <HierarchicalDataTemplate ItemsSource="{Binding Path=TheMatchingItems}"
                                                  ItemTemplate="{StaticResource DesignerHotButtonTemplate}">
                            <TextBlock Text="{Binding Path=TheHotButtonType, 
                                                      Converter={x:Static this:ButtonTypeConverter.TheInstance}}" />
                        </HierarchicalDataTemplate>
                    </telerik:RadPanelBar.ItemTemplate>
                </this:RadPanelBar>

------------------------------------------------------------------------------------------------------------------------

---------------------- control template --------------------------------

  <ControlTemplate TargetType="telerik:RadPanelBar">
                    <Grid>

                        <telerik:LayoutTransformControl x:Name="transformationRoot">
                            <Border BorderThickness="{TemplateBinding BorderThickness}"
                                    BorderBrush="{TemplateBinding BorderBrush}"
                                    Background="{TemplateBinding Background}">
                                <ScrollViewer x:Name="ScrollViewer"
                                              IsTabStop="False"
                                              HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
                                              VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"
                                              BorderBrush="Transparent"
                                              BorderThickness="0"
                                              Padding="{TemplateBinding Padding}"
                                              Margin="0"
                                              telerik:StyleManager.Theme="{StaticResource Theme}"
                                              HorizontalScrollBarVisibility="Auto"
                                              VerticalScrollBarVisibility="Auto"
                                              CanContentScroll="True">
                                    <ItemsPresenter />
                                </ScrollViewer>
                            </Border>
                        </telerik:LayoutTransformControl>
                    </Grid>
                </ControlTemplate>

The documentation for RadDataBar mentions a set of 4 controls: 

1. RadDataBar
2. RadStackedDataBar
3. RadStacked100DataBar
4. RadHorizontalAxis

Number 4, RadHorizontalAxis, is what I need, but I can't find this control anywhere in R1 2017. Also no documentation on how to use it nor an example. What am I missing???

Regards
Heiko

Hello,

I have an issue about your VisualizationLayer.

I bind the layer's ItemsSource on an ObservableCollection<Element> and each Element has a Location bind on MapLayer.Location (as in your samples)

But when I clear my collection et reload all data (without manipulating the map) all my points disappear

I tried a few things like use another property with a converter for the location but it's worse then if my map is centered on the correct location all my points are in lat :0, lng : 0 and if the map isn't centered on the location (the view doesn't show the location) my points are correctly loaded when I move the map on the correct location

I only use your sample and adjust the collection loading or reloading

Do you see what i'm doing wrong please ?

Thank You