Hi,

I was not able to find this answer on the forum. It looks like a simple thing to do but I was not able to understand it.

I have three RadTreeView with the following xaml options: (IsDragDropEnabled="True" AllowDrop="True" telerik:ScrollingSettingsBehavior.IsEnabled="False" IsDragTooltipEnabled="False") . All three Trees have 2 level of data of 2 different type of objects. 

The drop of an item might be allowed or not, depending on a combination on:

• the origin tree of the Drag (tree 1, 2 or 3)
• the type of object selected (level 1 or level 2)
• the target tree (tree 1,2 or 3)
• the drop position (inside, after, before)

As an example, the level 2 objects of tree 1 cannot be dropped on tree 3, while on tree 2 the can only be dropped inside the level 1, or before/after the level 2 (not inside level 2).

I implemented all the controls to allow this behaviour in the handler of "DragDropManager.AddDropHandler", in which when the drop is not allowed I simply have that the DropAction = DropAction.None and everything is working fine.

However what I would like to have is that when the drop is not supposed to be allowed, the drop preview should not be visible. by drop preview I mean the line in between items when the drop position is after/before or the highlight of the target item when the drop position is inside. Note that I still would like to keep the drag preview of the source item,  and that I disabled the dragtooltip as not of interest.

I considered using the handler "DragDropManager.AddDragInitializeHandler" to set the AllowDrop to false for all the correct items, however sometimes (like in the example above) I want to disable the drop only for certain drop positions, thus the item AllowDrop property cannot be set to false at the beginning of the drag. 

What I think I should do is to use the handler "DragDropManager.AddDragOverHandler", in which I check if the drop is feasible. If it is not, I somehow disable the drop preview, if it is allowed, i enable it once again. This is where I'm stuck.

Considering the variable var options = DragDropPayloadManager.GetDataFromObject(e.Data, TreeViewDragDropOptions.Key) as TreeViewDragDropOptions;

If after checking that the drop is not allowed I set options.DropTargetItem.AllowDrop = false, the visual result is exactly what I need. However, from that moment on the handler "DragDropManager.AddDragOverHandler" does not fire anymore on that Item, so I cannot set it again to true.

If instead I set options.DropTargetItem.IsDropAllowed = false; nothing happens.

I tried to play with the dragvisual property, setting as an example the  dragVisual.IsDropPossible = false, but it doesn't change the result (I guess that this property is only for the dragtooltip that I disabled)

Note that, if possible, I also do not want to override the drop position from the not allowed to the allowed one, like suggested in the documentation (https://docs.telerik.com/devtools/wpf/controls/radtreeview/how-to/drag-and-drop/enabled-drop-inside-only). 

Could you please suggest me how to proceed? Please let me know if you need more information.

Thanks in advance for your help.

Hello,

We have performance issues on a WPF application. We did some analysis using dotTrace (attached screenshot) where we saw that the method Telerik.Windows.Controls.GridView.GridViewVirtualizingPanel.MeasureOverride(Size) is causing quite some delay. 

Are there any ways to get this more up to speed ?

Thanks !

Hi Telerik Team,

We are using RadMaskedCurrencyInput inside RadGridView as RowDetailTemplate. But the performance is very poor, as it takes nearly 100 milliseconds for each number typing.

Also, it takes 2 to 4 seconds when we perform Select All and typing the number.

This happens only if the control is placed inside the RadGridView.

We have the same control outside the RadGridView for testing purpose which performs good.

Please let me know if any optimization can be done with this.

Below are the code we are using.

<tk:RadMaskedCurrencyInput

                    maskedInput:MaskedInputExtensions.MaxTextLength="5"

                    maskedInput:MaskedInputExtensions.Minimum="0"

                    FontSize="12"

                    FontWeight="DemiBold"

                    IsCurrencySymbolVisible="False"

                    Mask=""

                    SpinMode="None"

                    TextMode="PlainText" />

I'm not able to attach the video file here.
Thank You.

Hello, I have an issue with one column in the RadGridView.

I managed to bind a column to a value in the dictionary of my GridViewRow's DataContext.

Altought the filter icon appears, inside the list in the filter control I see only 1 item with the value "null", instead of the string values.

In the column itself, I can see all the values as expected.
I tried to set the DataMemberType/FilterMemberType to System.String, FilterMemberPath, add a converter that returns the string, and many other things that didn't work.

How can I filter this property?

The RadGridViewDataColumn is bound to a dictionary value on the DataMemberBinding property:
DataMemberBinding="{Binding MyDictionary[MyEnum.FirstValue].Title}"

Please see the "MyDemoProject.zip" example in the comments.

** Also sorting is not working. The sorting clears the RadGridRows, I think that it happens because of the same issue.

Hi

I have a model class that it is in the form

Class A
{
	public List<B> B {get;set;}
	public List<C> C {get;set;}
}

And I would build a treeview with a list of A: A1, A2 in this way:

A1
	Objects of type B
		B1
		B2
	Objects of type C
		C1
		C2
A2
	Objects of type B
		B3
		B4
	Objects of type C
		C3
		C4

But the second level is missing in the model class (we can see it as a "virtual level"). Is there a way to add the level directly in xaml (the number and the tags of the elements are fixed by design).

Thank you

Luigi

Hi

I use DragDropManager inside a RadGridView. When a user drags a row over another row I want to perform an action. I setup the DragOver event with:

DragDropManager.AddDragOverHandler(row, OnRowDragOver);

This works most of the time. However if a user moves the mouse in a fast movement over the row the event is not fired.

Is there some property (maybe updateTime or throtteTime) I can lower to ensure the event is always fired?

Hello.

I want to show in my pie chart only values not percentage.  How I can do this?

<telerik:RadPieChart
     x:Name="chart"
     Palette="Windows8"
     HoverMode="FadeOtherItems"
     HorizontalAlignment="Stretch"
     Foreground="{StaticResource KolorCzcionki1}"
     FontSize="{StaticResource HeaderFontSize}"                            
     VerticalAlignment="Stretch">
         <telerik:PieSeries ItemsSource="{Binding Raport, UpdateSourceTrigger=PropertyChanged}"
              ShowLabels="True"                                               
              ValueBinding="Ilosc"
              DisplayName="Name">
                  <telerik:PieSeries.LegendSettings>
                      <telerik:DataPointLegendSettings TitleBinding="Name"/>
                  </telerik:PieSeries.LegendSettings>
           </telerik:PieSeries>          
</telerik:RadPieChart>

Hi, I have a strange issue with your combo box.

I created a behavior that syncronize between the RadComboBox selected items to the ObservableCollection in thr view model.

I have two different xaml with one RadComboBox in each xaml and one ObservableCollection in each xaml (different collections).

The behavior was fully tested and works with WPF ListBox. When I use it with the RadComboBox I face a strange issue. Sometimes after data context is changed very fast (for example rows in GridView) the behavior stop synchronizing properly and some items are removed from the source collection.

Some inputs:

1. This is happening only with the RadComboBox

2. I tried your behavior from other forum question, but your behavior gets exception during update of the source collection (during the iteration of the target collection it says the it was changed).

I think that somehow you are changing the selected items collection of the RadGridView, so I am getting exceptions or executing additional collection changed events.

Questions:

1. Did you face something similar?

2. I couldn't reproduce in other application because my application is complex. Can you check your RadComboBox code and check if you are initializing the SelectedItems many times / updating the binding?

My window is always visible and the RadComboBox should not be initialized many times. I think that you initialize the SelectedItems collection many times in the CustomControl code.

Urgent and immediate assistance is requested to identify which of the .DLLs list below are impacted CVE vulnerability CVE-2021-28141, CVE-2020-13661, CVE-2020-11414, CVE-2019-19790, CVE-2019-18935, CVE-2018-15122, CVE-2017-11357, CVE-2017-11317, and CVE-2017-9248.

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