Questions on UI for WPF Forum

3 answers

101 views

I haven't come across any code example showing how to use custom sampling for data points in the chart control - at least what to say to the
radchart.SamplingSettings.SamplingFunction to signify custom sampling or how the sampling delegate would look like ... Please help out.

Chart

answered on 11 Feb 2011

1 answer

135 views

Rad pane show after close

If I click the close button on the radPane is the Pane disposed off?
How can I make sure that the pane is not disposed off when closed but disappear form the screen.
Also how to re-show this pane?

Docking

answered on 11 Feb 2011

3 answers

132 views

basic question

What is wrong with thsi code? why the busy indicator does not show up?

<Window xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" x:Class="WpfApplication1.MainWindow"

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

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

Title="MainWindow" Height="350" Width="525">

<Grid HorizontalAlignment="Stretch">

<Grid.RowDefinitions>

<RowDefinition Height="Auto" />

<RowDefinition />

</Grid.RowDefinitions>

<telerik:RadButton Click="Button_Click" Grid.Row="0" HorizontalAlignment="Center" Content="Load Appointments" FontWeight="Bold" Margin="12" Padding="18 4" />

<telerik:RadBusyIndicator x:Name="busyIndicator" Grid.Row="1" BusyContent="Loading data....">

<Button Height="34" Width="90" Content="xxx"/>

</telerik:RadBusyIndicator>

</Grid>

</Window>

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

namespace WpfApplication1

{

/// <summary>

/// Interaction logic for MainWindow.xaml

/// </summary>

public partial class MainWindow : Window

{

public MainWindow()

{

InitializeComponent();

}

private void Button_Click(object sender, RoutedEventArgs e)

{

busyIndicator.IsBusy = true;

System.Threading.Thread.Sleep(100000);

busyIndicator.IsBusy = false;

}

BusyIndicator

answered on 11 Feb 2011

9 answers

394 views

radbook and external file

I need to load radbook from database , without save images into tmp , and i want navigate on that dinammicly .
So is it possible , we have .something like

this ,radbook.load(_my image as byte[]) or as Image - so i i can convert before to use.

Book

answered on 11 Feb 2011

3 answers

119 views

Custom

Hi

I need to add columns in the header column as shown in the attached design.

NOVEMBER				DECEMBER
27	28	29	30	1	2	3	4

The columns should be added to the header column. If anyone knows how to do it, please reply.

Thanks

TreeListView

answered on 11 Feb 2011

11 answers

128 views

Setting HorizontalGridLine height to zero?

Hello!

I want to display a lot of rows in my RadGridView so therefor I want to make it as compact as possible with little space between the rows. Is there a way to remove the area of the HorizontalGridLines? Setting the HorizontalGridLine height to zero that is.

Best regards,
Anna

GridView

answered on 10 Feb 2011

1 answer

107 views

Allowing user to pick custom color

Are there plans to allow a user to pick a custom color, not just one from the palette? Without this, the color picker is useful, but much less useful for general purpose use.

ColorPicker

answered on 10 Feb 2011

1 answer

115 views

ExportToImage function throw null reference exception

I try to use the function ExportToImage(Stream) from a RadChart object and it always throw an null reference exception whatever the chart I try.

Here is a sample code I try to test the function :

List<int> data = new List<int>();

Random rand = new Random(123456);

for (int i = 0; i < 50; i++)

{

data.Add(rand.Next(10, 100));

}

chartTest.DefaultSeriesDefinition = new LineSeriesDefinition() { ShowItemLabels = false, ShowPointMarks = false };

chartTest.DefaultView.ChartArea.AxisX.LabelStep = 25;

chartTest.DefaultView.ChartArea.EnableAnimations = false;

chartTest.ItemsSource = data;

Stream ms = new MemoryStream();

chartTest.ExportToImage(ms);

/*BitmapImage src = new BitmapImage();

src.BeginInit();

src.StreamSource = ms;

src.EndInit();

img1.Source = src;*/

Exception throw at this line :

chartTest.ExportToImage(ms);

Exception message :

{"Object reference not set to an instance of an object."}

Exception call stack :

   at Telerik.Windows.Media.Imaging.ExportHelper.get_TransformToDevice() in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\ExportExtensions\ExportHelper.cs:line 50
   at Telerik.Windows.Media.Imaging.ExportHelper.get_TransformToDeviceMatrix() in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\ExportExtensions\ExportHelper.cs:line 43
   at Telerik.Windows.Media.Imaging.ExportHelper.get_SystemDpiX() in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\ExportExtensions\ExportHelper.cs:line 16
   at Telerik.Windows.Media.Imaging.ExportHelper.GetElementImage(FrameworkElement element) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\ExportExtensions\ExportHelper.cs:line 62
   at Telerik.Windows.Media.Imaging.ImageExporter.Export(FrameworkElement element, Stream stream, BitmapEncoder encoder) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\ExportExtensions\ImageExporter.cs:line 12
   at Telerik.Windows.Media.Imaging.ExportExtensions.ExportToImage(FrameworkElement element, Stream stream, BitmapEncoder encoder) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Core\Controls\ExportExtensions\ExportExtensions.cs:line 100
   at Telerik.Windows.Controls.RadChart.ExportToImage(Stream stream) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2_SP1\Sources\Development\Controls\Chart\Chart\RadChart.Exporting.cs:line 168
   at TestChart.MainWindow..ctor() in C:\Dev\TestChart\TestChart\MainWindow.xaml.cs:line 41

Chart

answered on 10 Feb 2011

8 answers

85 views

Reorder Row By Drag & Drop - Q3 2009 SP1

Hello,

I am trying to reorder the rows at a grid by drag and drop. I have looked at the examples and solutions you have given about this case. But i can not convert it to q3 2009 sp1. the objects use at the solutions are no more at q3 2009 sp1. Can you kindly suggest a solution.
Regards.

GridView

answered on 10 Feb 2011

4 answers

200 views

RadDataFilter and Value Converters

Hello,

I am looking for general advice/guidance on using the RadDataFilter when the filtered result is displayed in a Grid that uses Value Converters. Let me paint the scenario...

In the general use case, the RadDataFilter accepts a Source and emits a FilteredItemSource. The Source is the collection of items to be filtered, and the Filtered ItemSource is the result of the filter, that can be bound to some other control like the RadGridView. However, if a column in the GridView used to display the results uses a Value Converter to modify the displayed value in any way, you can get into a problem that will cause a lot of confusion to the user. Namely, the filter no longer operates on values as displayed in the grid. So when the user enters filter criteria, the grid may not filter as expected because the user is most likely entering values that match the display in the grid, while the filter is operating on the underlying values.

I believe that this problem can also be demonstrated when perhaps the backing data contains a value of type double, while the datagrid uses a string format to show the value as a percent.

Although I believe I know why things are working this way, I am wondering what the best-practices might be to get things to work as expected from the user. Should we refrain from using Value Converters in the display, and instead do the conversion in the backing store (i.e. the RadDataFilter's Source collection) hence operating on raw values only? If so, this seems a little unfortunate. Is there another approach that might be helpful here?

I am curious to hear whether anyone else has run into this problem and what you might have done.

Thanks,
Mark.

DataFilter

answered on 10 Feb 2011