[Solved] Telerik update - drag arrow disappeared

[Tracey]

Hi After doing a rad controls update from Visual Studio. My drag arrow has disappeared. I am using the following to generate the arrow:

private void OnDragQuery(object sender, DragDropQueryEventArgs e)

 {
// draw the arrow
if (e.Options.Status == DragStatus.DragQuery)
{
e.QueryResult = true;
e.Handled = true;

var arrowCue = RadDragAndDropManager.GenerateArrowCue();

arrowCue.Background = new SolidColorBrush(ColourFormat.GetColourFromHex("#FFCC0000"));

arrowCue.BorderBrush = new SolidColorBrush(ColourFormat.GetColourFromHex("#FFCC0000"));

e.Options.ArrowCue = arrowCue;

}

 }

Telerik Silverlight VSExtensions   2011.01.414.0
Telerik RadControls for Silverlight VSExtensions Package

[Tsvyatko]

Hello Tracey,

First, please excuse us for the inconvenience caused. Please check the information below:

Problem:
Using RadDragAndDropManager Options.ArrowCue does not have any effect and drag cue no longer displays

Cause:
Since Q2 we have introduced new Drag and Drop mechanism through DragDropManager that provides Drag and Drop functionality in cases that RadDragAndDropManager does not work as well as more intuitive API. In order to be backward compatible all RadDragAndDropManager events are raised as usual. However, since DragDropManager does not have build-in arrow cue there is no mechanism to display it.

Solution:
You can enable RadDragAndDropManager legacy mechanism by using RadDragAndDropManager.ExecututionMode :

RadDragAndDropManager.ExecututionMode = DragExectionMode.Legacy;

The best place to add this line is in App constructor.

public App()
{
 RadDragAndDropManager.ExecututionMode = DragExectionMode.Legacy;
}

soon, we will also provide an alternative solution through custom implementation.

Let us know if you have any further questions.

Kind regards,
Tsvyatko
the Telerik team

[Tracey]

Thank you for your uber speedy reply, much appreciated. I redid the update and that seemd to fix it. If it happens again I will try what you suggest.

Thanks again

[Gaurang]

Hi,

I have same problem. I update my dll then arrow can not see.

<Controls:CrmGridView x:Name="gvEmail" SelectionChanged="gvEmail_SelectionChanged" ScrollViewer.HorizontalScrollBarVisibility="Auto" ScrollViewer.VerticalScrollBarVisibility="Auto"
                                    Margin="0,0,0,0" IsReadOnly="True" ScrollMode="RealTime" VerticalAlignment="Stretch" HorizontalAlignment="Stretch"
                                    IsFilteringAllowed="False" ShowGroupPanel="False" VerticalGridLinesBrush="Gray" AutoGenerateColumns="False" SelectionMode="Extended" >
                                <gridView:RadGridView.RowStyle>
                                    <Style x:Name="DefaultFontWeight" TargetType="gridElements:GridViewRow">
                                        <Setter Property="dragDrop:RadDragAndDropManager.AllowDrag" Value="True" />
                                    </Style>
                                </gridView:RadGridView.RowStyle>
                                <gridView:RadGridView.AlternateRowStyle>
                                    <Style TargetType="gridElements:GridViewRow">
                                        <Setter Property="dragDrop:RadDragAndDropManager.AllowDrag" Value="True" />
                                    </Style>
                                </gridView:RadGridView.AlternateRowStyle>
</Controls:CrmGridView>
----------------------------------------------------------------------------------------------------------------------------

private void OnDragQuery(object sender, DragDropQueryEventArgs e)
        {

            if (e.Options.Status == DragStatus.DragQuery)
            {
                e.Options.ArrowCue = RadDragAndDropManager.GenerateArrowCue();

                var dataGrid = sender as RadGridView;

                var items = dataGrid.SelectedItems.Cast<EmailMessage>().ToList();

                e.Options.Payload = items;

                var image = new Image()
                {
                    Source = new BitmapImage(new Uri(ImageDB.Email.INVALIDDROP)) //It will show 'x' sign here.
                };

                e.Options.DragCue = image;

                e.QueryResult = true;
            }

            if (e.Options.Status == DragStatus.DropSourceQuery)
            {
                e.QueryResult = true;
                e.Handled = true;
            }
        }

Please reply me. What should I change to show Arrow on drag-drop functionality.

Thanks,
Gaurang

[Tsvyatko]

Hi Gaurang,

 Hove you tried the solution suggested earlier:

"Problem:

Using RadDragAndDropManager Options.ArrowCue does not have any effect and drag cue no longer displays

Cause:
Since Q2 we have introduced new Drag and Drop mechanism through DragDropManager that provides Drag and Drop functionality in cases that RadDragAndDropManager does not work as well as more intuitive API. In order to be backward compatible all RadDragAndDropManager events are raised as usual. However, since DragDropManager does not have build-in arrow cue there is no mechanism to display it.

Solution:
You can enable RadDragAndDropManager legacy mechanism by using RadDragAndDropManager.ExecututionMode :

Copy Code

RadDragAndDropManager.ExecututionMode = DragExectionMode.Legacy;

The best place to add this line is in App constructor.

Copy Code

public App()

{

 RadDragAndDropManager.ExecututionMode = DragExectionMode.Legacy;

}




"

You can also check this help article - http://www.telerik.com/help/silverlight/raddragdropmanager-troubleshooting-drag-arrow-does-not-display.html

Best wishes,
Tsvyatko
the Telerik team

[Gaurang]

HI,

I try above solution in my OnDragQuery function

RadDragAndDropManager.ExecututionMode = DragExectionMode.Legacy;

then try in class constracture

RadDragAndDropManager.AddDragQueryHandler( gridEmail, OnDragQuery);

RadDragAndDropManager.AddDragInfoHandler( gridEmail, OnDragInfo);

RadDragAndDropManager.ExecutionMode = DragExecutionMode.Default;
---------------------------------------------------------------------------

RadDragAndDropManager.ExecutionMode = DragExecutionMode.Default;
InitializeComponent();

Thanks,
Gaurang

[Gaurang]

Hi,

I solved my problem.
I set  RadDragAndDropManager.ExecutionMode = DragExecutionMode.Legacy; property. on both side

Before InitializeComponet();
and inside
OnDragQuery() funciton.

Thanks,
Gaurang

[Kevin]

what's the modern way to show the arrowcue?

[Nick]

Hello Kevin,

Still the best way to do this with RadDragAndDropManager is to set the DragExecutionMode to Legacy. You can see how this can be done here.

Hope this helps! 

All the best,
Nik
the Telerik team

[Rory]

Hi I am implementing a RadGridView Drag to a RadChart and the arrow is not showing. I found this thread and when implementing LegacyMode I started getting an error: "Set property 'Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.AllowDrag' threw an exception. [Line: 93 Position: 107

Is there any other way to show the arrow without going back to the legacy version of RadDragAndDropManager?

[Oscar Wahlen]

I have tried setting the ExecutionMode but the property does not exist (version 2011.3.1116.1040).

[Nick]

Hello Oscar,

Can you provide some more information about your scenario? The feature is available in the mentioned version. You could be experiencing the problem if the version of the project (Silverlight) is not the same as the version of our assembly. In this case it should be Silverlight 4.

Greetings,
Nik
the Telerik team

[Oscar Wahlen]

Hello Nik,

Here is an extract of our implementation build against version 2011.3.1116.1040. The project is configured for Silverlight 4 but we have the latest Silverlight runtime installed on the development machine as well (version 5.1.10411.0). I am pretty sure the arrow was visible in an earlier version of RadControls for Silverlight. But now there is only a drag queue and no arrow.

MainPage.xaml

<UserControl x:Class="DragAndDrop.MainPage"
    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"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400">
    <UserControl.Resources>
        <DataTemplate x:Key="ApplicationDragTemplate">
            <Border Width="50" Height="50" Background="Blue" />
        </DataTemplate>
        <ControlTemplate x:Key="CustomArrowTemplate" TargetType="telerik:DragArrow">
            <Grid Height="30">
                <Grid.ColumnDefinitions>
                    <ColumnDefinition Width="*" />
                    <ColumnDefinition Width="Auto" />
                </Grid.ColumnDefinitions>
                <Path Height="27" Margin="0,0,-2,0" VerticalAlignment="Bottom" Fill="Black" Stretch="Fill" Data="M0,10 L130,0 L130,25 L0,11.25 z" />
                <Image Height="31" HorizontalAlignment="Left" VerticalAlignment="Center" Width="20" Source="/DragAndDrop;component/Images/pushpin.png" Stretch="Fill" Margin="0,-30,0,0"/>
                <Image Width="70" Height="30" Stretch="Fill" Source="/DragAndDrop;component/Images/pointer.png" Grid.Column="1" HorizontalAlignment="Right"/>
            </Grid>
        </ControlTemplate>

    </UserControl.Resources>
    <Grid x:Name="LayoutRoot" Background="White">
        <Grid.ColumnDefinitions>
            <ColumnDefinition />
            <ColumnDefinition />
        </Grid.ColumnDefinitions>
        <Border Width="100" Height="100" Background="Green" telerik:RadDragAndDropManager.AllowDrag="True" />
        <Border Grid.Column="1" Width="100" Height="100" Background="Orange" telerik:RadDragAndDropManager.AllowDrop="True" />
    </Grid>
</UserControl>

MainPage.xaml.cs

namespace DragAndDrop
{
    using Telerik.Windows.Controls.DragDrop;

    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();

            RadDragAndDropManager.AddDragQueryHandler(this, OnDragQuery);
            RadDragAndDropManager.AddDragInfoHandler(this, OnDragInfo);
            RadDragAndDropManager.AddDropQueryHandler(this, OnDropQuery);
            RadDragAndDropManager.AddDropInfoHandler(this, OnDropInfo);
        }

        private void OnDropInfo(object sender, DragDropEventArgs e) { }

        private void OnDropQuery(object sender, DragDropQueryEventArgs e)
        {
            e.QueryResult = true;
        }

        private void OnDragInfo(object sender, DragDropEventArgs e) { }

        private void OnDragQuery(object sender, DragDropQueryEventArgs e)
        {
            if (e.Options.Status == DragStatus.DragQuery && e.Options.Source != null)
            {
                ContentControl cue = new ContentControl();
                cue.ContentTemplate = this.Resources["ApplicationDragTemplate"] as DataTemplate;
                e.Options.DragCue = cue;
                var arrowCue = RadDragAndDropManager.GenerateArrowCue();
                arrowCue.Template = this.Resources["CustomArrowTemplate"] as ControlTemplate;
                e.Options.ArrowCue = arrowCue;
            }
            e.QueryResult = true;
        }
    }
}

Oscar

[Nick]

Hello Oscar,

I believe the problem is related to the fact that there isn't specified a Legacy Execution mode for the RadDragAndDropManager. Could you add this line before the InitializeComponent method in your main page? 

RadDragAndDropManager.ExecutionMode = DragExecutionMode.Legacy;

All the best,
Nik
the Telerik team

[Oscar Wahlen]

Hello again Nik,

I thought the property did not exist but it does. It must have been a typo because the problem is now solved. Thank you for your help.

Oscar

[Swapnil]

How to use arrow cue same as RadDragAndDropManager with DragDropManager  because RadDragAndDropManager got obsolete 

[Martin Ivanov]

Hello Swapnil,

I already answered your question in the other forum.

Regards,
Martin Ivanov
Progress Telerik