This is a migrated thread and some comments may be shown as answers.

[Solved] Single grid row when filtered causes cells to disappear when scrolling

2 Answers 160 Views

GridView

This is a migrated thread and some comments may be shown as answers.

This question is locked. New answers and comments are not allowed.

Chuck asked on 26 Jul 2011, 02:39 PM

We have discovered yet another issue with cell redraw when using virtualization and row filters.
We have a style selector on a cell. We have many columns of data and therefore enable column virtualization. When only a single row is selected in the filter, the cell will not repaint when you scroll back and forth. Any moving of the column will cause it to repaint. If you have more than one row, the problem does not exist. We have had numerous issues surrounding this. We have tried every version of nightly builds as well. Some would show blanks when grouping, others would randomly disappear when scrolling.
This version seems to be the closest to stable with this one issue.
Please help!
Able to reproduce in example project from telerik. Just add more columns to the style selector example:
<Examples:GridViewExample x:Class="Telerik.Windows.Examples.GridView.Selectors.StyleSelectors.CellStyleSelector.Example"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:sys="clr-namespace:System;assembly=mscorlib"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
        xmlns:Examples="clr-namespace:Telerik.Windows.Examples"
  xmlns:telerikQuickStart="clr-namespace:Telerik.Windows.Controls.QuickStart;assembly=Telerik.Windows.Controls"
        VerticalAlignment="Center" HorizontalAlignment="Center">

    <telerikQuickStart:QuickStart.ExampleHeader>
        <TextBlock Text="Cell Style Selector" Margin="8" />
    </telerikQuickStart:QuickStart.ExampleHeader>

    <Grid>
        <Grid.Resources>
            <Style x:Key="HighUnitPriceStyle" TargetType="telerik:GridViewCell">
    <Setter Property="Background" Value="#7F2FB3FD" />
            </Style>
            <Style x:Key="LowUnitPriceStyle" TargetType="telerik:GridViewCell" />
            <Examples:UnitPriceConveter x:Key="converter" />
            <Examples:ConditionalStyleSelector x:Key="selector" ConditionConverter="{StaticResource converter}">
                <Examples:ConditionalStyleSelector.Rules>
                    <Examples:ConditionalStyleRule Style="{StaticResource HighUnitPriceStyle}">
                        <Examples:ConditionalStyleRule.Value>
                            <sys:Boolean>True</sys:Boolean>
                        </Examples:ConditionalStyleRule.Value>
                    </Examples:ConditionalStyleRule>
                    <Examples:ConditionalStyleRule Style="{StaticResource LowUnitPriceStyle}">
                        <Examples:ConditionalStyleRule.Value>
                            <sys:Boolean>False</sys:Boolean>
                        </Examples:ConditionalStyleRule.Value>
                    </Examples:ConditionalStyleRule>
                </Examples:ConditionalStyleSelector.Rules>
            </Examples:ConditionalStyleSelector>
        </Grid.Resources>
  <Border telerikQuickStart:ThemeAwareBackgroundBehavior.IsEnabled="True" Grid.RowSpan="3" />
        <telerik:RadGridView x:Name="RadGridView1" ItemsSource="{Binding Products}" EnableRowVirtualization="True" AutoGenerateColumns="False" MinHeight="386" MaxHeight="500" Width="700"
                          CanUserFreezeColumns="False" RowIndicatorVisibility="Collapsed">

            <telerik:RadGridView.Columns>
                <telerik:GridViewDataColumn Header="ID" DataMemberBinding="{Binding ProductID}" />
                <telerik:GridViewDataColumn Header="Product Name" DataMemberBinding="{Binding ProductName}"/>
                <telerik:GridViewDataColumn Header="Unit Price" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:c}"
                                            CellStyleSelector="{StaticResource selector}" />
                <telerik:GridViewDataColumn Header="Units In Stock" DataMemberBinding="{Binding UnitsInStock}" />
                <telerik:GridViewDataColumn Header="Unit Price" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:c}"
                                            CellStyleSelector="{StaticResource selector}" />
                <telerik:GridViewDataColumn Header="Unit Price2" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:c}"
                                            CellStyleSelector="{StaticResource selector}" />
                <telerik:GridViewDataColumn Header="Unit Price3" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:c}"
                                            CellStyleSelector="{StaticResource selector}" />
                <telerik:GridViewDataColumn Header="Unit Price4" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:c}"
                                            CellStyleSelector="{StaticResource selector}" />
                <telerik:GridViewDataColumn Header="Unit Price5" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:c}"
                                            CellStyleSelector="{StaticResource selector}" />
                <telerik:GridViewDataColumn Header="Unit Price6" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:c}"
                                            CellStyleSelector="{StaticResource selector}" />
                <telerik:GridViewDataColumn Header="Unit Price12" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:c}"
                                            CellStyleSelector="{StaticResource selector}" />
                <telerik:GridViewDataColumn Header="Unit Price13" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:c}"
                                            CellStyleSelector="{StaticResource selector}" />
                <telerik:GridViewDataColumn Header="Unit Price14" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:c}"
                                            CellStyleSelector="{StaticResource selector}" />
                <telerik:GridViewDataColumn Header="Unit Price15" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:c}"
                                            CellStyleSelector="{StaticResource selector}" />
                <telerik:GridViewDataColumn Header="Unit Price16" DataMemberBinding="{Binding UnitPrice}" DataFormatString="{}{0:c}"
                                            CellStyleSelector="{StaticResource selector}" />
            </telerik:RadGridView.Columns>
        </telerik:RadGridView>
    </Grid>
</Examples:GridViewExample>

[Solved] Single grid row when filtered causes cells to disappear when scrolling

2 Answers, 1 is accepted