Questions on UI for WPF Forum

2 answers

372 views

DataLoadMode="Asynchronous" is not recommended?

Hello,

in the documentation of the RadGridView (at http://www.telerik.com/help/wpf/radgridview-performance-tips-tricks.html) I've read the following:
"DataLoadMode="Asynchronous" - using this mode is not recommended, it leads to potential problems. Please do not use it."

Can you elaborate on why it is not recommended to use this and what the "potential problems" are ?

By the way: It is a bit odd to read in the documentation that an existing Feature should not be used :-)

Thank you!

Sincerely yours,
David

GridView

answered on 06 Jan 2016

2 answers

282 views

Custom crosshair label style

Hey,

I tried getting a around, creating custom template and style for the crosshair labels, however nothing gets displayed.

Could you point me in the right direction with a simple demo? E.g vertical label being a red circle with the text written in black.

Thanks in advance

ChartView

answered on 06 Jan 2016

3 answers

112 views

[Bug report] serializing \r\n using IValueProvider

if i serialize \r\n using IValueProvider, RestoreValue will change it to \n instead (\r is missing)

PersistenceFramework

answered on 06 Jan 2016

3 answers

1.3K+ views

BasedOn="{StaticResource GridViewRowStyle}"

Using 2013.Q2.SP1

I am trying to use the Drag and Drop example in my application and it uses the style below. However, when I run my application I get an error because of the BasedOn="{StaticResource GridViewRowStyle}". Where is this style? I could not find it in the VS 2012 samples.

Error Message:
{"Cannot find resource named 'GridViewRowStyle'. Resource names are case sensitive."}

<Style TargetType="telerik:GridViewRow" x:Key="OrderItemStyle" BasedOn="{StaticResource GridViewRowStyle}">

<Setter Property="telerik:DragDropManager.AllowCapturedDrag" Value="True" />

<Setter Property="telerik:DragDropManager.TouchDragTrigger" Value="TapAndHold"

/>

</Style>

GridView

answered on 06 Jan 2016

1 answer

770 views

[Solved] Can I use ChartView for creating of Real-Time charts?

Hi! First of all I bag your pardon for my poor English. I'm very interested in using ChartView control for building charts displaying information in real-time. I write a WPF C# application that is reading (in real-time) data slices (via COM-port) from ultrasonic flowmeter for gas conduit and (after reading every data slice) drawing (in real-time) line chart from data of this slice. So I have two questions:

1) Can I use ChartView for drawing of those charts in real-time?

2) What is the maximal time-resolution of ChartView? Does it has time-resolution in microseconds (that is it can executes drawing of chart in time-interval of tens of fmicroseconds) or in milliseconds only?

ChartView

answered on 06 Jan 2016

3 answers

191 views

[Solved] Dependency question

Today I discovered the following file in my build folder: Telerik.Windows.Data.dll

Upon further research, I discovered that this file is listed as a dependency for RadMap:
http://docs.telerik.com/devtools/wpf/installation-and-deployment/deploying-telerik-ui/installation-installing-dependencies-wpf.html

I have 3 projects using the map and only one has this file in the build folder. Two are using WPF 4.5 and one is using WPF 4.0. I've been sending out the installations for years without this file and haven't had a problem. Can you explain why this file is needed? Also any idea why it is only just now showing up for this one project?

These are the two files I am actually referencing:
C:\Program Files (x86)\Telerik\UI for WPF\Binaries.NoXaml\WPF45\Telerik.Windows.Controls.DataVisualization.dll
C:\Program Files (x86)\Telerik\UI for WPF\Binaries.NoXaml\WPF45\Telerik.Windows.Controls.dll

Map

answered on 05 Jan 2016

4 answers

97 views

Inconsistent error notification behavior between "Full Row" and "Cell" selection units

If "Full Row" selection unit is used, and particular field has an error, the row header displays an error icon summarizing the errors when hovered over (see attached "error - full row selection unit.jpg"). This is not the case when "Cell" is the selection unit (see "error - cell selection unit.jpg").

Do I need to set something to enable the same behavior, or is this a bug?

I am using trial version (2015.3.1104.45)

GridView

answered on 05 Jan 2016

1 answer

235 views

Cut/paste functionality in gridview

Hi,

Right now,we are able to do copy/paste for cells in the grid view.Do we have the similar functionality for cut/paste in the gridview?

If so, could you provide us the sample code?

GridView

answered on 05 Jan 2016

4 answers

347 views

RadCartesianChart: Label of BarSeries are showing wrong position when windows is resized

Hi,

I'm trying to make a bar chart with long text of categories, so I wrapped them all by the following code

xaml

<Grid SizeChanged="Grid_SizeChanged">

<telerik:RadCartesianChart Grid.Row="0"

x:Name="ChartSeries"

>

<telerik:RadCartesianChart.HorizontalAxis>

<telerik:CategoricalAxis ClipToBounds="False" HorizontalLocation="Right" SmartLabelsMode="SmartStep" IsStepRecalculationOnZoomEnabled="True">

<telerik:CategoricalAxis.LabelTemplate>

<DataTemplate>

<TextBlock TextWrapping="Wrap" MaxWidth="{Binding ElementName=Self, Path=MaxWidthTextBlock}" Text="{Binding}" />

</DataTemplate>

</telerik:CategoricalAxis.LabelTemplate>

</telerik:CategoricalAxis>

</telerik:RadCartesianChart.HorizontalAxis>

<telerik:RadCartesianChart.VerticalAxis>

<telerik:LinearAxis Minimum="0"

RangeExtendDirection="Positive"

SmartLabelsMode="SmartStep"

>

</telerik:LinearAxis>

</telerik:RadCartesianChart.VerticalAxis>

<telerik:BarSeries ShowLabels="False" ClipToPlotArea="False">

<telerik:BarSeries.DataPoints>

<telerik:CategoricalDataPoint Category="TextTextTextTextTextTextText" Value="2" />

<telerik:CategoricalDataPoint Category="TextTextTextTextTextTextTextTextText" Value="5" />

<telerik:CategoricalDataPoint Category="TextTextTextTextTextTextTextTextTextText" Value="3" />

<telerik:CategoricalDataPoint Category="TextTextTextText" Value="10" />

<telerik:CategoricalDataPoint Category="TextTextTextTextTextTextTextTextTextTextTextTextText" Value="9" />

<telerik:CategoricalDataPoint Category="TextTextTextText" Value="7" />

<telerik:CategoricalDataPoint Category="TextTextTextText" Value="1" />

</telerik:BarSeries.DataPoints>

</telerik:BarSeries>

<telerik:RadCartesianChart.Grid>

<telerik:CartesianChartGrid MajorLinesVisibility="Y" x:Name="Line">

<telerik:CartesianChartGrid.MajorYLineStyle>

<Style TargetType="Line">

<Setter Property="Stroke" Value="DarkGray"/>

</Style>

</telerik:CartesianChartGrid.MajorYLineStyle>

</telerik:CartesianChartGrid>

</telerik:RadCartesianChart.Grid>

</telerik:RadCartesianChart>

</Grid>

As you can see, I have a method to recalculate the maxwidth of textblock when the container's size is change(Grid) as the following code behind

private void Grid_SizeChanged(object sender, SizeChangedEventArgs e)

{

if(e.PreviousSize.Width != 0)

{

var ratio = e.NewSize.Width / e.PreviousSize.Width;

MaxWidthTextBlock *= ratio;

}

The calculation seems to compute correctly for max width of the textblock but the position of the label is not correct. It seems to be a bit right aligned.

Do you have any idea to make it center as before windows size is changed, please advise ?

I also attached the image for before / after windows size change.

Best Regards,
Witt

<Grid SizeChanged="Grid_SizeChanged">

<telerik:RadCartesianChart Grid.Row="0"

x:Name="ChartSeries"

>

<telerik:RadCartesianChart.HorizontalAxis>

<telerik:CategoricalAxis ClipToBounds="False" HorizontalLocation="Right" SmartLabelsMode="SmartStep"IsStepRecalculationOnZoomEnabled="True">

<telerik:CategoricalAxis.LabelTemplate>

<DataTemplate>

<TextBlock TextWrapping="Wrap" MaxWidth="{Binding ElementName=Self, Path=MaxWidthTextBlock}"Text="{Binding}" />

</DataTemplate>

</telerik:CategoricalAxis.LabelTemplate>

</telerik:CategoricalAxis>

</telerik:RadCartesianChart.HorizontalAxis>

<telerik:RadCartesianChart.VerticalAxis>

<telerik:LinearAxis Minimum="0"

RangeExtendDirection="Positive"

SmartLabelsMode="SmartStep"

>

</telerik:LinearAxis>

</telerik:RadCartesianChart.VerticalAxis>

<telerik:BarSeries ShowLabels="False" ClipToPlotArea="False">

<telerik:BarSeries.DataPoints>

<telerik:CategoricalDataPoint Category="TextTextTextTextTextTextText" Value="2" />

<telerik:CategoricalDataPoint Category="TextTextTextTextTextTextTextTextText" Value="5" />

<telerik:CategoricalDataPoint Category="TextTextTextTextTextTextTextTextTextText" Value="3" />

<telerik:CategoricalDataPoint Category="TextTextTextText" Value="10" />

<telerik:CategoricalDataPoint Category="TextTextTextTextTextTextTextTextTextTextTextTextText" Value="9"/>

<telerik:CategoricalDataPoint Category="TextTextTextText" Value="7" />

<telerik:CategoricalDataPoint Category="TextTextTextText" Value="1" />

</telerik:BarSeries.DataPoints>

</telerik:BarSeries>

<telerik:RadCartesianChart.Grid>

<telerik:CartesianChartGrid MajorLinesVisibility="Y" x:Name="Line">

<telerik:CartesianChartGrid.MajorYLineStyle>

<Style TargetType="Line">

<Setter Property="Stroke" Value="DarkGray"/>

</Style>

</telerik:CartesianChartGrid.MajorYLineStyle>

</telerik:CartesianChartGrid>

</telerik:RadCartesianChart.Grid>

</telerik:RadCartesianChart>

</Grid>

ChartView

answered on 05 Jan 2016

8 answers

215 views

[Solved] Inconsistent Enter key handling between "FullRow" and "Cell" or "Mixed" selection units

I'm running into various issues with buggy behaviour between row and cell selection units. To start with, when cell is in view mode and SelectionUnit="FullRow", pressing "Enter" keys moves to the cell below ... perfect! However, if SelectionUnit="Cell" pressing "Enter" does nothing. Is this a known bug? I wired up a custom keyboard command provider to see what commands are being generated, and sure enough, I see 3 commands queued up: Activate, MoveDown, and Select the current unit. However, they are not actually invoked, or fail at some point, if they are invoked.

This behaves as expected when cell is in edit mode.

GridView

answered on 04 Jan 2016