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After AddNewItem the Record is not shown in Form. ?

Hi Telerik ,

i have a problem but can´t see a solution yet.I do not know if its a bug somewhere.I hope you have a hint what could be the problem. 

MVVM + WPF

1) I have a Grid + RadDataForm 

<Grid>
        <telerik:RadDataForm x:Name="LookupListFormCtrl"
                         Header="{Binding DisplayName,FallbackValue='Lookup'}" 
                         AutoGenerateFields="False"
                         CommandButtonsVisibility="All"
                         ItemsSource="{Binding Nodes,Mode=TwoWay}"
                         CurrentItem="{Binding SelectedUiDataItem,Mode=TwoWay}"
                         BorderBrush="Green" BorderThickness="6"
                         ReadOnlyTemplate="{StaticResource LookupListFormDataTemplate}"
                         EditTemplate="{StaticResource LookupListFormDataTemplate}"
                         />
</Grid>

 

with the Resource Template as 

    <DataTemplate x:Key="LookupListGridDataTemplate" DataType="{x:Type local:LookupListGrid}">
        <UniformGrid Columns="2">
			<telerik:DataFormDataField  Label="LOOKUP"
										DataMemberBinding="{Binding lookup_lkp, Mode=TwoWay}"/>
			<telerik:DataFormComboBoxField Label="GROUP LOOKUP" 
											DataMemberBinding="{Binding  group_lookup_lkp, Mode=TwoWay}"
											DisplayMemberPath="display_nam"
											ItemsSource="{Binding Nodes.GroupLookups}"  
											SelectedValuePath="lookup_lkp" 
											IsComboboxEditable="False" />
			<telerik:DataFormComboBoxField Label="PAR LKP LOOKUP" 
											DataMemberBinding="{Binding  par_lkp_lookup_lkp, Mode=TwoWay}"
											DisplayMemberPath="display_nam"
											ItemsSource="{Binding Nodes.ParLkpLookups}"  
											SelectedValuePath="lookup_lkp" 
											IsComboboxEditable="True" />
			<telerik:DataFormComboBoxField Label="PAR LKP GROUP LOOKUP" 
											DataMemberBinding="{Binding  par_lkp_group_lookup_lkp, Mode=TwoWay}"
											DisplayMemberPath="display_nam"
											ItemsSource="{Binding Nodes.ParLkpGroupLookups}"  
											SelectedValuePath="lookup_lkp" 
											IsComboboxEditable="True" />
			<telerik:DataFormDataField  Label="DISPLAY"
										DataMemberBinding="{Binding display_nam, Mode=TwoWay}"/>
			<telerik:DataFormDataField  Label="DISPLAY SHORT"
										DataMemberBinding="{Binding display_short_txt, Mode=TwoWay}"/>
				
			<telerik:DataFormCheckBoxField  Label="VALID" DataMemberBinding="{Binding IsValidYn, Mode=TwoWay}" />
                    
        </UniformGrid>
    </DataTemplate>

I query the Data from DB and it´s shown as well if i press the Update Button the Form changes to writable and all the Columns are viewable and changeable. 

So Fine. 

My "Nodes" Class ( = Item Source ) is derived from ObservableItemCollection<T> and enhanced with IEditableCollectionView, IEditableCollectionViewAddNewItem

In the derived Class the methods of IEditableCollectionView  are written and linked to a class which is as well derived from 

 DataFormCommandProvider. ( because i encapsulate all the method calls there ) 

Additionaly this derived class is also added to the DataForm in the View Code behind.

parentcollection.CommandProvider.DataForm = LookupListFormCtrl;


 

At the End in the MyCommandProvider class a new Item is created and added to the Collection. ( this i see in the Debug Mode) and also the Current Item 

is set to the new empty created Item. 

Until here it looks fine but the Form doesn´t show me the "empty" Record i created , I checked also if the Current Item ( = SelectedUiDataItem ) 

is this newly created ones and it is. And also all the Can* Methods returning true. 

First i thought there is somewhere a bug on my side but know i am not sure because 

i changed AutoGenerateFields="True" and in this moment the Form show all the columns i expected. 

In behind the same methods are called and new Item to collection is created. 

In the derived Class of DataFormCommandProvider i called additionaly the .AddNew() before i created and added a new Item but anyhow it´s has no effect. 

I think i have overseen some parameter to the xaml or forgot to set something so i hope on any hint from yours. 

Thanks br Thomas Cinatl 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

DataForm
Stefan
Telerik team
 answered on 07 Aug 2018
3 answers
85 views
TimeBar Selector with large amount of data points

Hello, I have been using Telerik in a WPF desktop application. We have a control that displays a large amount of data points (ranging from around a thousand points to over a million points), and a custom selector that lets you designate a section of the data to zoom in on.

We want to replace the custom selector we are currently using with the selector from the TimeBar control. We use points instead of dates, but I got around the issue by representing each point as a 'day'. The problem is, when I add a large amount of data to the RadLinearSparkline (26,000 points of random numbers), the selector control becomes sluggish, for example the resize selector has a 3-4 second delay if I move one of the bounds.

So I technically have 3 questions:

Does the TimeBar support large amounts of data? 

Is there a way to change the range data from date-times to doubles/ints (or another control with the same selector)?

Is there a way I can just use the selector without the time bar itself?

 

Here is the relevant code in my example project

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

Random r = new Random();
            List<int> LinearData = new List<int>();
            for (DateTime currentDate = DateTime.Today; currentDate < DateTime.Today.AddDays(1000000);
                currentDate = currentDate.AddDays(1))
            {
                LinearData.Add(r.Next(0, 100000));
            }
            this.DataContext = LinearData;

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

     <telerik:RadTimeBar PeriodStart="1-Jan-0001 12:00:00 AM" PeriodEnd="31-Dec-2740 11:59:59 PM"
                      VisiblePeriodStart="11-Nov-2010 12:00:00 AM" VisiblePeriodEnd="14-March-2011 11:59:59 PM"
                      SelectionStart="1-Jan-2011 12:00:00 AM" SelectionEnd="28-Feb-2011 11:59:59 PM">
        <telerik:RadTimeBar.Intervals>
        </telerik:RadTimeBar.Intervals>
        <telerik:RadLinearSparkline ItemsSource="{Binding}"/>
    </telerik:RadTimeBar>

 

If you need any additional information about the project, let me know

TimeBar
Stefan
Telerik team
 answered on 07 Aug 2018
3 answers
251 views
licensing question
Dear All
    Does the WPF control can be used in a open source project? In telerik website, i see WPF have more components than winform, is it more powerful?
thanks
from Peter (cmk128@hotmail.com)
General Discussions
Dinko | Tech Support Engineer
Telerik team
 answered on 07 Aug 2018
7 answers
581 views
System.NullReferenceException: Object reference not set to an instance of an object

Dear experts,

I am having this Exception randomly in my WPF application, any idea how to fix it? I occurs randomly when I try to add a source data file on my application:

12/06/2017 02:37:28 PM Fatal: App :: Unhandled Exception!
Machine Name : .....User Name :.......  
Exception : System.NullReferenceException: Object reference not set to an instance of an object. at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.FlatLayoutStrategy.RealizeRows(Int32 startIndex, Int32 endIndex, Double& verticalOffset, HashSet`1& realizedRows) at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.FlatLayoutStrategy.MeasureOverride(Size availableSize) at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.MeasureOverride(Size availableSize) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.ContextLayoutManager.UpdateLayout() at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg) at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks() at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget) at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

12/06/2017 02:57:02 PM Fatal: App :: Unhandled Exception!
Machine Name : ......User Name : ......
Exception : System.NullReferenceException: Object reference not set to an instance of an object. at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.FlatLayoutStrategy.RealizeRows(Int32 startIndex, Int32 endIndex, Double& verticalOffset, HashSet`1& realizedRows) at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.FlatLayoutStrategy.MeasureOverride(Size availableSize) at Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.MeasureOverride(Size availableSize) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint) at System.Windows.Controls.ScrollContentPresenter.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV) at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.ScrollViewer.MeasureOverride(Size constraint) at Telerik.Windows.Controls.GridView.GridViewScrollViewer.MeasureOverride(Size availableSize) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV) at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Border.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.DockPanel.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint) at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Border.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Control.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Control.MeasureOverride(Size constraint) at Telerik.Windows.Controls.GridView.GridViewDataControl.MeasureOverride(Size availableSize) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Border.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV) at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint) at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV) at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint) at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Border.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Control.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Control.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint) at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Border.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Control.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint) at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Control.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV) at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint) at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint) at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Documents.AdornerDecorator.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Control.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV) at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV, Boolean& hasDesiredSizeUChanged) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Documents.AdornerDecorator.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Window.MeasureOverrideHelper(Size constraint) at System.Windows.Window.MeasureOverride(Size availableSize) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.ContextLayoutManager.UpdateLayout() at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg) at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks() at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget) at System.Windows.Media.MediaContext.AnimatedRenderMessageHandler(Object resizedCompositionTarget) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

General Discussions
Vladimir Stoyanov
Telerik team
 answered on 07 Aug 2018
1 answer
100 views
Binding Questions for treeview

I have read through the samples and the docs trying to get the flat self-referencing data binding to work with the tree view, but I am not making good progress.

My application is using the MVVM design pattern. When I run my application, I do not get any data in the tree view, but my view model has fetched the data that I expect to see in the tree view. 

When I debug the application, the  class is called before the Loaded event handler has fired, passing it my uninitialized view model, which it can do nothing with. When that call completes, the Loaded event handler is called and the view model is initialized with the data for the tree view, but the converter is not called again.

 

I need some help trying to understand how I should be using this control, I am not getting it despite having read through your SDK docs and samples.

 

Thanks

-Sean

 

 

TreeView
Martin Ivanov
Telerik team
 answered on 06 Aug 2018
9 answers
237 views
BitMap Exception for RadDiagram.ExportToImage() method

Hi Telerik,

 

I'm export my RadDiagram to Image with the appropriate functionnality, but I have an error (not systematically).

My code :

Private Function CreateStreamFromDiagram(diag As RadDiagram, rect As Windows.Rect) As MemoryStream
    If diag Is Nothing Then Return New MemoryStream({})
 
    Dim mem_stream As New MemoryStream()
 
    diag.ExportToImage(
        stream:=mem_stream,
        encoder:=New System.Windows.Media.Imaging.JpegBitmapEncoder(),
        enclosingBounds:=rect,
        returnImageSize:=rect.Size,
        backgroundBrush:=Windows.Media.Brushes.White,
        margin:=New Windows.Thickness(1),
        dpi:=DIAGRAM_IMG_DPI
    )
 
    Return mem_stream
End Function

 

When the method is called, sometimes, I have this error :

à System.Windows.Media.Imaging.WriteableBitmap.InitFromBitmapSource(BitmapSource source)
   à System.Windows.Media.Imaging.WriteableBitmap..ctor(BitmapSource source)
   à Telerik.Windows.Controls.Diagrams.BitmapUtils.CreateWriteableBitmap(UIElement element, Rect enclosingBounds, Size returnImageSize, Brush backgroundBrush, Thickness margin, Double dpi)
   à Telerik.Windows.Controls.RadDiagram.CreateDiagramImage(Rect enclosingBounds, Size returnImageSize, Brush backgroundBrush, Thickness margin, Double dpi)
   à Telerik.Windows.Controls.RadDiagram.ExportToImage(Stream stream, BitmapEncoder encoder, Nullable`1 enclosingBounds, Size returnImageSize, Brush backgroundBrush, Thickness margin, Double dpi)
   à Portal_ViewModel.MirBuilder.PdfAReportItext7.CreateStreamFromDiagram(RadDiagram diag, Rect rect) dans C:\Users\ng707d2\Desktop\DEV\MAA_MIR_Builder_v2\Sources\WPFPortal\Portal_ViewModel\Mir_Builder\PDFGeneration\PdfAReportItext7.vb:ligne 1292
   à Portal_ViewModel.MirBuilder.PdfAReportItext7.ExportInspectionDiagToImage(Single p_widthRedRectangle) dans C:\Users\ng707d2\Desktop\DEV\MAA_MIR_Builder_v2\Sources\WPFPortal\Portal_ViewModel\Mir_Builder\PDFGeneration\PdfAReportItext7.vb:ligne 1397
   à Portal_ViewModel.MirBuilder.PdfAReportItext7.ExportPage() dans C:\Users\ng707d2\Desktop\DEV\MAA_MIR_Builder_v2\Sources\WPFPortal\Portal_ViewModel\Mir_Builder\PDFGeneration\PdfAReportItext7.vb:ligne 1360
   à Portal_ViewModel.MirBuilder.PdfAReportItext7.ExportCurrentOnglet() dans C:\Users\ng707d2\Desktop\DEV\MAA_MIR_Builder_v2\Sources\WPFPortal\Portal_ViewModel\Mir_Builder\PDFGeneration\PdfAReportItext7.vb:ligne 446

 

Sometimes, the error is an OutOfMemoryException type, but sometimes, the error is "Unable to evaluate expression".

And others times, the error is not occurred...

 

Do you have any idea about this problem ?

Thank you.

 

Valentin.

Diagram
Dinko | Tech Support Engineer
Telerik team
 answered on 06 Aug 2018
1 answer
212 views
RadCartesianChart3D
We are currently evaluating Telerik UI for WPF control, in particular 3d Charts. We have a few requirements that we are currently unable to find a easy way to accomplish using RadCartesianChart3D. Please suggest how we can:

  1. Draw a grid line at (X Y) = (0, 0)  ( A grid line that indicates the Z axis)?
  2. Do a texture mapping on the 3D surfaces?
    One approach was to use a Image Brush instead of Solid Color brush for defining the Default Visual Material group in the example. But it does not seem to work. I can attach the sample code we tried if needed.
  3. Text annotation on RadCartesianChart3D ? Examples would be highly appreciate.

Thanks

 

ChartView3D
Martin Ivanov
Telerik team
 answered on 06 Aug 2018
0 answers
133 views
RadTreeView drop command or pre-post drag events?

I'm using RadTreeView's drag drop feature to reorder/nest items.

The control has many features that I (drop preview line, TreeViewDragVisual, and tooltip).

However, I need to execute some complex reorder/nest/unnest logic for the actual drag/drop operation (guards, pre and post).

So far, I was able to implement my guards by binding the RadTreeViewItem.IsDropAllowed.

But have no idea how to run some code before and after a drag/drop.

 

My questions:

1. Is it possible to invoke a command for a drag/drop operation, instead of automatically manipulating the bound collection?

2. Which events do I listen to before and after (collection is modified) a drag/drop operation? DragStarted and DragEnded events have been marked obsolete.

 

And if there is a workaround (custom implementation of drag/drop), can I continue using the other features of RadTreeView (drop preview line, TreeViewDragVisual, and tooltip)?

 

Thanks

minchew

TreeView
MC
Top achievements
Rank 1
 asked on 06 Aug 2018
0 answers
106 views
Chart Legend for ChartView3D

I am creating a RadCartesianChart3D with multiple series of data. I was looking at the documentation for the control, and I didn't see a way to include a legend for the graph.

Is there a way to add a legend to the graph that just has the series name and corresponding color?

Additionally, I want to have a few graphs that use a "Heatmap" legend. I've attached a sample image of the way I want the legend to work, but it is essentially a liner gradient with labeled intervals on the gradient. 

If there is an inbuilt way to include a Heatmap as the legend, I would like to know. Otherwise if someone has implemented a similar type of legend, how did you accomplish it?

ChartView3D
Matthew
Top achievements
Rank 1
 asked on 03 Aug 2018
1 answer
824 views
Using combobox as a textbox

Hello Telerik,

I want Rad.ComboBox to be edited, i.e. I want to be able to search and select an item inside the combobox and also in case I don't have an item inside the combo, I would like to be able to type the new value and be able to bind the new item to save later.

What happens right now is that when the item I am looking for is not in combobox, as soon as I leave the combo the value inside the combobox is lost!

My question is how can I keep the search and auto-complete ability inside the combobox and also be able to keep the typed value?

Please answer asap.

Best Regards

Kourosh

ComboBox
Dinko | Tech Support Engineer
Telerik team
 answered on 03 Aug 2018
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