Questions on UI for WPF Forum

1 answer

141 views

RadGridView and IDataErrorInfo Container Recycling Issue

Hi,

I have bound the GridView to a collection of objects implementing IDataErrorInfo for validation (as I want my validation on a view model, not in event handlers in the view).

All appears to work well until I scroll horizontally or vertically. Once I have seen an invalid cell on screen, scrolling to the side or up/down will then make it seem like other cells also have the same validation error. I assume this is down to the container recycling. I have attempted to turn container recycling off using VirtualizingStackPanel.VirtualizationMode="Standard" but this had no effect. There is way too much data to even consider turning row/column virtualization off. Incidentally, I had this same grid working using the DataGrid from WPF Toolkit. Although the toolkit grid did have poorer performance it did not suffer this container recycling issue.

Is this a known issue - are there any workarounds? I'm really keen to start using the RadGridView but if I cannot get validation working as expected then I will have to stick to the toolkit.

Regards,

Andy

GridView

answered on 09 Aug 2010

1 answer

193 views

How to keep checkbox column in edit mode?

Hi,

My RadGridView is binding to a DataTable, and one column is boolean checkbox. I have to click the chechbox for several times to enable to edit it, how do I solve this problem?

<Window x:Class="Window1"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

Title="Window1" Height="300" Width="300" xmlns:my="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView">

<Grid>

<my:RadGridView Name="RadGridView1" />

</Grid>

</Window>

Class Window1

Public Sub New()

InitializeComponent()

Dim dt As New System.Data.DataTable

dt.Columns.Add("hide", GetType(Boolean))

dt.Columns.Add("highlight", GetType(String))

dt.Columns(0).DefaultValue = True

dt.Columns(0).ReadOnly = False

dt.Columns(1).DefaultValue = "test"

dt.Columns(1).ReadOnly = True

Dim row1 As System.Data.DataRow = dt.NewRow

row1("hide") = True

row1("highlight") = "A"

dt.Rows.Add(row1)

Dim row2 As System.Data.DataRow = dt.NewRow

row2("hide") = True

row2("highlight") = "B"

dt.Rows.Add(row2)

RadGridView1.ItemsSource = dt

End Sub

End Class

GridView

answered on 09 Aug 2010

1 answer

168 views

loading image from folder

Is there a way to load up images from external folder and put inside the book?

Book

answered on 06 Aug 2010

7 answers

633 views

Receiving GridViewHyperlinkColumn Click Event

Try as I might, I can find no way to listen for a Click event within a GridViewHyperlink column cell. What am I missing? I am creating the columns of the grid dynamically based on metadata retrieved from a database, e.g.,

column = new GridViewHyperlinkColumn();

(column as GridViewHyperlinkColumn).ContentBinding = new Binding(columnInfo.FieldName);

column.DataMemberBinding = new Binding(columnInfo.FieldName);

column.IsFilterable = columnInfo.CanFilter;

column.Header = columnInfo.DisplayName;

column.IsEnabled = columnInfo.IsEnabled;

column.IsReadOnly = true;

What I would like to be able to do is write something like

(column as GridViewHyperlinkColumn).Clicked += MyClickHandler;

However, the Clicked event is not defined for the column type.

How can I receive the click event?

Thanks,

Chris.

GridView

answered on 06 Aug 2010

2 answers

156 views

Is there a way to wrap text in a column header?

I have an image column that displays an 18x18 image and the column header text is making the column too wide. It just doesnt look right. But I can wrap the text in the header, it will cut the width of the column in half. Is there a way to do this?

Thanks in advance...

GridView

answered on 06 Aug 2010

1 answer

151 views

How can I reuse the simple style that customizes a chart series through ItemStyle?

Hi,

I hate writing a title for a thread because sometimes it's impossible to explain my question in short :)

Anyway I've found the below style from this article in KB. What I want to do is being able to reuse this style in more than one chart or more than one series by just changing the color. But although I've tried to make "TemplateBinding" to Background property of Bar class or to some other control part but I wasn't able to do it. I couldn't find the place (if I can) to specify the Background property.

<Window.Resources>

<Setter.Value>

<Rectangle

x:Name="PART_DefiningGeometry"

Fill="Red"

Stroke="Pink"

StrokeThickness="3"

Height="{TemplateBinding ActualHeight}"

Width="{TemplateBinding ActualWidth}"/>

</ControlTemplate>

</Setter.Value>

</Setter>

</Style>

</Window.Resources>

As a summary what I want to do is to bind Fill property to some other property on a control and reuse this style. It should be easy! But not for me?

Does anyone have an idea?

Thanks

Chart

answered on 06 Aug 2010

3 answers

251 views

RadDateTimePicker Assembly Name

Hi,

I'm trying to create a custom datetime picker from inheriting from RadDateTimePicker control.

Can you please tell the assembly name(dll name), where i can inhert the RadDateTimePicker class.

Thanks,
-Narendra

DateTimePicker

answered on 06 Aug 2010

3 answers

210 views

DataTrigger on LineColor

Hi,

First, sorry for my bad english, i'm a french student in internship.

Well, in my application, i'm using MVVM pattern, and I've created an UserControl, with a telerik chart (using LineSerie).

I would like to change the line color when a property change.

Here is an example of what I want to do:

<Grid DataContext="{Binding PublicationCollecteurVM}" Width="auto" Height="auto">

<Grid.Resources>

<Style TargetType="telerik:Chart">

<Style.Triggers>

<DataTrigger Binding="{Binding Path=GestionNiveau,NotifyOnSourceUpdated=True}" Value="2">

<Setter Property="Chart.LineColor" Value="#FCB143"/>

</DataTrigger>

<DataTrigger Binding="{Binding Path=GestionNiveau,NotifyOnSourceUpdated=True}" Value="1">

<Setter Property="Chart.LineColor" Value="#FFFF48"/>

</DataTrigger>

<DataTrigger Binding="{Binding Path=GestionNiveau,NotifyOnSourceUpdated=True}" Value="3">

<Setter Property="Chart.LineColor" Value="#FE761B"/>

</DataTrigger>

</Style.Triggers>

</Style>

</Grid.Resources>

<telerik:RadChart x:Name="RadChart1" telerik:StyleManager.Theme="Office_Black" Grid.Row="1" Height="193" Width="372" Grid.Column="1" ItemsSource="{Binding NbHitLus}">

<telerik:RadChart.DefaultView>

<telerik:ChartDefaultView>

<telerik:ChartDefaultView.ChartArea>

<telerik:ChartArea LegendName="CustomLegend">

<telerik:ChartArea.AxisX>

<telerik:AxisX MajorGridLinesVisibility="Collapsed"

Title="Minute" />

</telerik:ChartArea.AxisX>

<telerik:ChartArea.AxisY>

<telerik:AxisY MajorGridLinesVisibility="Collapsed"

MinorTicksVisibility="Visible"

Title="NbHitsLus" AutoScale="True" />

</telerik:ChartArea.AxisY>

</telerik:ChartArea>

</telerik:ChartDefaultView.ChartArea>

<telerik:ChartDefaultView.ChartLegend>

<telerik:ChartLegend Visibility="Collapsed" x:Name="CustomLegend" UseAutoGeneratedItems="True" Width="0">

<telerik:ChartLegend.Header>Custom legend header</telerik:ChartLegend.Header>

</telerik:ChartLegend>

</telerik:ChartDefaultView.ChartLegend>

<telerik:ChartDefaultView.ChartTitle>

<telerik:ChartTitle HorizontalAlignment="Center" >

<TextBlock TextAlignment="Center">

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

<LineBreak/>

<TextBlock Margin="-8,0,0,0">Numéro collecteur :</TextBlock>

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

<TextBlock Padding="10,0,0,0">Numéro log :</TextBlock>

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

</TextBlock>

</telerik:ChartTitle>

</telerik:ChartDefaultView.ChartTitle>

</telerik:ChartDefaultView>

</telerik:RadChart.DefaultView>

<telerik:RadChart.DefaultSeriesDefinition>

<telerik:LineSeriesDefinition/>

</telerik:RadChart.DefaultSeriesDefinition>

</telerik:RadChart>

</Grid>

So first could you tell me how to change Line color ?

Thank's

Chart

answered on 06 Aug 2010

9 answers

295 views

Performance issue when adding items to collection

I'm having some really bad performance when adding rows to the grid. I've got the grid items bound to an ObservableCollection. I'm then adding 7000 rows one-by-one to this collection. It basically freezes up for a couple of minutes.

I've done some profiling to try and find out what's holding things up and it seems to be spending about a 1/3 of the time in QueryableCollectionView:ProcessSynchronousCollectionChangedWithAdjustedArgs. Is there a way to set up the grid to avoid this call?

The main problem in that method is that it calls PropertyChangeInfo:GetChangedPropertyNames which compiles a linq expression foreach each propertyAccess. Any suggestions for improving the performance there?

Thanks!

GridView

answered on 06 Aug 2010

8 answers

151 views

Compare the Top Item with Currently Clicked item in RadCarouselPanel

Hi,

I'm new to Telerik Controls. I'm trying to use the carousel controls in Expression Blend 4; having the few questions below

- Unlike the RadCaruosel for WinForm, I couldn't specify the eliptical path for the carousel items in Expression Blend (and VS2010), on WPF. Is that a limitation on this control for WPF currently? If not, how can I set the eliptical path (at design time)
- I've 8 items on the Carousel control (I tried it on Carousel and CarouselPanel), but only 5 are visible at a time. Other three would scroll in when I click the item near to them. Is there a way I can show all the 8 controls on my real estate?

Lastely, How can I compare and identify whether the user clicked on the top most item on the Carousel Panel? For example, out of my 8 items, if the user clicks on the item 6 it would be made as the top item. When the user clicks on it again, I want to identify it and perform some action.

Thanks in advance.
Ela

Carousel

answered on 06 Aug 2010