RowStyle cause blank rows

[Laurent]

Hello,

I'm trying to implement drag&drop in a radgridview.

I'm using this how to :
http://www.telerik.com/help/wpf/dragdropmanager-howto-draganddrop-within-radgridview.html

Everything is ok, but as soon as I add rowstyle code block, my rows are displayed blank (scrollbar remains visible).

This code is ok :

<telerik:RadGridView ItemsSource="{Binding Object.Details.Attributes}"

                        AutoGenerateColumns="True"

                        ScrollViewer.CanContentScroll="True"

                        ScrollViewer.HorizontalScrollBarVisibility="Visible"

                        ScrollViewer.VerticalScrollBarVisibility="Visible"

                        CanUserDeleteRows="False"

                        CanUserInsertRows="False"

                        CanUserReorderColumns="False"

                        CanUserResizeRows="False"

                        CanUserFreezeColumns="False"

                        CanUserSortColumns="False"

                        IsFilteringAllowed="False"

                        RowIndicatorVisibility="Collapsed"

                        ShowGroupPanel="False"

                        DataLoadMode="Asynchronous"

                        IsReadOnly="{Binding IsEditing, Converter={StaticResource InvertBoolConverter}}"

                        EnableRowVirtualization="True"

                        FrozenColumnCount="1"

                        AllowDrop="True"

                        behaviors:RowReorderBehavior.IsEnabled="True"

                        BeginningEdit="Attributes_RadGridView_BeginningEdit"

                     >

 

    <telerik:RadGridView.Resources>

        <DataTemplate x:Key="DraggedItemTemplate">

            <StackPanel>

                <StackPanel Orientation="Horizontal">

                    <TextBlock Text="Dragging:" />

                    <TextBlock Text="{Binding CurrentDraggedItem}"

                  FontWeight="Bold" />

                </StackPanel>

                <StackPanel Orientation="Horizontal">

                    <TextBlock Text="{Binding CurrentDropPosition}" FontWeight="Bold" MinWidth="45" />

                    <TextBlock Text=", (" Foreground="Gray" />

                    <TextBlock Text="{Binding CurrentDraggedOverItem}" />

                    <TextBlock Text=")"

                  Foreground="Gray" />

                </StackPanel>

            </StackPanel>

        </DataTemplate>

    </telerik:RadGridView.Resources>

     

 

 

 

    <telerik:RadGridView.Columns>

 

        <telerik:GridViewDataColumn Header="Attribute" DataMemberBinding="{Binding Attribute.TechName}" IsReadOnly="True"/>

        .......

        <telerik:GridViewDataColumn Header="Length" DataMemberBinding="{Binding Attribute.Details.LengthInternal}" IsReadOnly="True"/>

    </telerik:RadGridView.Columns>

     

</telerik:RadGridView>

But with this code, rows are displayed blank (only headers and scrollbars are visibles) :

<telerik:RadGridView ItemsSource="{Binding Object.Details.Attributes}"
                        AutoGenerateColumns="True"
                        ScrollViewer.CanContentScroll="True"
                        ScrollViewer.HorizontalScrollBarVisibility="Visible"
                        ScrollViewer.VerticalScrollBarVisibility="Visible"
                        CanUserDeleteRows="False"
                        CanUserInsertRows="False"
                        CanUserReorderColumns="False"
                        CanUserResizeRows="False"
                        CanUserFreezeColumns="False"
                        CanUserSortColumns="False"
                        IsFilteringAllowed="False"
                        RowIndicatorVisibility="Collapsed"

                        ShowGroupPanel="False"
                        DataLoadMode="Asynchronous"
                        IsReadOnly="{Binding IsEditing, Converter={StaticResource InvertBoolConverter}}"
                        EnableRowVirtualization="True"
                        FrozenColumnCount="1"
                        AllowDrop="True"
                        behaviors:RowReorderBehavior.IsEnabled="True"
                        BeginningEdit="Attributes_RadGridView_BeginningEdit"
                     >

    <telerik:RadGridView.Resources>
        <DataTemplate x:Key="DraggedItemTemplate">
            <StackPanel>
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="Dragging:" />
                    <TextBlock Text="{Binding CurrentDraggedItem}"
                  FontWeight="Bold" />
                </StackPanel>
                <StackPanel Orientation="Horizontal">
                    <TextBlock Text="{Binding CurrentDropPosition}" FontWeight="Bold" MinWidth="45" />
                    <TextBlock Text=", (" Foreground="Gray" />
                    <TextBlock Text="{Binding CurrentDraggedOverItem}" />
                    <TextBlock Text=")"
                  Foreground="Gray" />
                </StackPanel>
            </StackPanel>
        </DataTemplate>
    </telerik:RadGridView.Resources>




    <telerik:RadGridView.Columns>

        <telerik:GridViewDataColumn Header="Attribute" DataMemberBinding="{Binding Attribute.TechName}" IsReadOnly="True"/>
           .....
        <telerik:GridViewDataColumn Header="Length" DataMemberBinding="{Binding Attribute.Details.LengthInternal}" IsReadOnly="True"/>
    </telerik:RadGridView.Columns>

    <telerik:RadGridView.RowStyle>
        <Style TargetType="telerik:GridViewRow">
            <Setter Property="Background" Value="Red"/>
            <Setter Property="telerik:DragDropManager.AllowDrag" Value="True" />
        </Style>
    </telerik:RadGridView.RowStyle>

</telerik:RadGridView>

Do you know what is the root cause ?

Thanks in advance,

Laurent

[Laurent]

Hi all,

It took me a long (very very long) time, but I finally found the solution.

When you use implicit styles, you need to add following statement in style block declaration :

BasedOn="{StaticResource GridViewRowStyle}"

It can be a good thing to add this in official documentation.

Regards,

Laurent

[Dimitrina]

Hi Laurent,

You can check our documentation on Implicit Styles where this is explained.
Thank you for your feedback. I will update the article about DragDropManager, you referred to.

Regards,
Didie
Telerik