Questions on UI for WPF Forum

1 answer

162 views

Hi,

I'm trying to create an horizontal bar chart with labels inside the bars, close the to right side of the bars, line in labels-inside.png. I have tried several things but the closest I could get to it was the labels right after the bars (see labels-outside.png).

How can I get the labels inside the bars close to the right edge? Is it possible?

Thanks,

Luis Barreira

ChartView

answered on 26 Jun 2017

4 answers

165 views

Problem with pie chart

I've been using ChartView for some time to create charts from a Windows service without problems. The chart control (RadCartesianChart or RadPieChart) is created and initialized in code, and then is rendered to a bitmap.

Ever since I updated the libraries to the latest version, when I try to create a pie chart, the result is always a blank image. The other chart types continue to work as expected.

The code I'm using is the following:

private bool CreatePieChartThread(MemoryStream stream, int width, int height)

{

RadPieChart chart = new RadPieChart

{

Palette = BuildColorPalette(m_chartColors),

SmartLabelsStrategy = new PieChartSmartLabelsStrategy

{

DisplayMode = PieChartLabelsDisplayMode.SpiderAlignedOutwards

}

};

var labelBoxFactory = new FrameworkElementFactory(typeof(TextBlock));

labelBoxFactory.SetValue(FrameworkElement.HorizontalAlignmentProperty, HorizontalAlignment.Center);

labelBoxFactory.SetBinding(TextBlock.TextProperty, new Binding("Label"));

var valueBoxFactory = new FrameworkElementFactory(typeof(TextBlock));

valueBoxFactory.SetValue(FrameworkElement.HorizontalAlignmentProperty, HorizontalAlignment.Center);

valueBoxFactory.SetBinding(TextBlock.TextProperty, new Binding("Value"));

var panelFactory = new FrameworkElementFactory(typeof(StackPanel));

panelFactory.SetValue(StackPanel.OrientationProperty, Orientation.Vertical);

panelFactory.AppendChild(labelBoxFactory);

if (m_showValuesOnPie)

panelFactory.AppendChild(valueBoxFactory);

PieSeries series = new PieSeries

{

ShowLabels = true,

RadiusFactor = 0.75,

AngleRange = new AngleRange(-90, 360),

LabelConnectorsSettings = new ChartSeriesLabelConnectorsSettings()

};

series.LabelDefinitions.Add(new ChartSeriesLabelDefinition

{

Margin = new Thickness(-8, 0, 0, 0),

Template = new DataTemplate { VisualTree = panelFactory }

});

// valores ordenados por nome e sem zeros

foreach (var value in m_data.Where(d => d.AlarmOccurrences > 0).OrderBy(d => d.Name))

{

series.DataPoints.Add(new PieDataPoint

{

Label = value.Name,

Value = value.AlarmOccurrences,

OffsetFromCenter = 0.05,

});

}

chart.Series.Add(series);

PrepareElementForExport(chart, width, height);

ExportExtensions.ExportToImage(chart, stream, new PngBitmapEncoder());

return true;

}

protected void PrepareElementForExport(FrameworkElement element, int width, int height)

{

if (!element.IsInitialized)

{

element.BeginInit();

element.EndInit();

}

element.Measure(Size.Empty);

element.Measure(new Size(width, height));

element.Dispatcher.Invoke(() => { });

element.Arrange(new Rect(0, 0, width, height));

element.UpdateLayout();

}

ChartView

answered on 26 Jun 2017

2 answers

403 views

Problem Selecting row in a radGridview with touchscreen

Hello I have a problem selecting rows in a Radgrid with TOUCHSCREEN. At the start, one row is selected (the blue one, as you can see in the screenshot), but when I click on another row nothing happens (I just see small little circus that I'm tapping on the screen). Everythings works fine if I use a mouse attached to the tablet but doesn't work if I use finger on touchscreen. The desired result is that the row "touched" becomes blue and is the SelectedItem="{Binding SelectedItuGrid.

Just to let you know that the radiobutton and the Button X works with touch after I added this instruction: telerik:TouchManager.IsTouchHitTestVisible ="False"

This is the XAML code:

Please let me know,

thank you.

GridView

answered on 26 Jun 2017

1 answer

107 views

Is it possible to customize HtmlFormatProvider?

Hi,

I am very new to Telerik and I am trying us RichTextBox on my project.

One of the requirement is to export text to HTML5 as responsive.

My thinking is that I need to intercept, customize or subclass HtmlFormatProvider to achieve what I want.

Is intercepting, customizing or subclassing HtmlFormatProvider possible?

Or is there a way to create HTML5 in my way?

Thanks in advance.

Jaeho

RichTextBox

answered on 26 Jun 2017

0 answers

131 views

Sending DragDrop Commands to ViewModel

this is a followup to the question asked here

Wouldnt it be possible to implement it the way gong-wpf-dragdrop does it without breaking mvvm?

i considerthe line below in codebehind to not break mvvm so i could be wrong.

(DataContext as ViewModel).SelectedRecord

The way gong does it is you bind the view model itself, implement an interface and handle the logic using interface implementations.

Would love to be able to handle that logic in my VM rather than using a behavior

DragAndDrop

asked on 23 Jun 2017

3 answers

222 views

RadRichTextBox error with htmlformatprovider

Hello.

I have built a perfectly functional usercontrol, which includes a radrichtextbox with htmldataprovider (pretty nice, pretty easy, works like a charm).

Now I need to expose it to some VB6 client :-/, so as I have done before, I just host it in a winforms form, add some COM interfaces, and it should work all the same (been there, done that...)

Well, no...

It keeps giving me this error:

Value cannot be null. Parameter name: formatProvider

at Telerik.Windows.Documents.FormatProviders.DataProviderBase..ctor(ITextBasedDocumentFormatProvider formatProvider, DependencyProperty stringProperty)
at Telerik.Windows.Documents.FormatProviders.Html.HtmlDataProvider..ctor()
at System.Xaml.Schema.XamlTypeInvoker.DefaultCtorXamlActivator.InvokeDelegate(Action`1 action, Object argument)
at System.Xaml.Schema.XamlTypeInvoker.DefaultCtorXamlActivator.CallCtorDelegate(XamlTypeInvoker type)
at System.Xaml.Schema.XamlTypeInvoker.DefaultCtorXamlActivator.CreateInstance(XamlTypeInvoker type)
at System.Xaml.Schema.XamlTypeInvoker.CreateInstance(Object[] arguments)
at MS.Internal.Xaml.Runtime.ClrObjectRuntime.CreateInstanceWithCtor(XamlType xamlType, Object[] args)
at MS.Internal.Xaml.Runtime.ClrObjectRuntime.CreateInstance(XamlType xamlType, Object[] args)

I tried:

<telerik:HtmlFormatProvider x:Key="HtmlFormatProvider" />

<telerik:HtmlDataProvider RichTextBox="{Binding ElementName=SocialHistoriesHtml}" FormatProvider="{StaticResource HtmlFormatProvider}" Html="{Binding HTML}" />

RichTextBox

answered on 23 Jun 2017

7 answers

271 views

Missing Property causes Filtering and Sorting to no longer work

I'm using RadGridView to show certain properties of a list of elements.
This works as expected as long as all elements in the list have all properties the columns bind to.

But once only one element does not have a property a column binds to the whole columns fails to correctly support sorting and filtering.

When sorting no element is shown at all and the filter dialog does not show any values. See attached screenshots.

This still happens even though a FallbackValue of the right type is provided in the Binding.

Is there a way to make this work? Sadly I can not avoid having some elements that do not implement all properties, so a failing binding most be handled in a better way.

My Xaml:

<Window x:Class="WpfTestApplication.MainWindow"

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

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

xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"

xmlns:telerikG="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView"

xmlns:telerikD="clr-namespace:Telerik.Windows.Data;assembly=Telerik.Windows.Data"

Title="MainWindow" Height="200" Width="300">

<Grid>

<telerikG:RadGridView ItemsSource="{Binding Elements}" AutoGenerateColumns="False">

<telerikG:RadGridView.Columns>

<telerikG:GridViewDataColumn Header="cost" DataMemberBinding="{Binding cost, FallbackValue=0.0}"/>

</telerikG:RadGridView.Columns>

</telerikG:RadGridView>

</Grid>

</Window>

GridView

answered on 23 Jun 2017

5 answers

184 views

Slowdown without internet

Greetings. I'm using 2014.3.1202.45, so it's possible this is already fixed. If the computer has a network connection, but the internet is not working, there is a delay of a few seconds when initializing the map. This happens when calling Map.Providers.Insert. If there is no network connection at all, this problem does not happen. Is there a way to shorten or eliminate this delay from my side or in the code?

Map

answered on 23 Jun 2017

1 answer

241 views

NoXaml Xaml switcheroo

So you guys flag projects by XAML and no XAML so when an upgrade is done you know which files to use.

How can one switch a project from one to the other though so the upgrade extension is aware which one you are trying to do.

Specifically I have two projects that are flagged incorrectly.

the upgrade occurs and the reference to the theme is removed.

I then have to manually find the themes folder and add a reference.

Installer and Visual Studio Extensions

answered on 23 Jun 2017

1 answer

392 views

Custom FilterDescriptor

I have been trying to create a custom filter control and I am running into issues.

It seems that even when writing a custom filter, the decision of whether a row will be filtered in or out is based on one or more FilterDescriptors, which basically only take in the name of the data field, one of a set of predefined operators, and the value to compare the value in the data field to.

Is there any way to define our own logic for whether a row will pass the filter? Any way to write in a function that will take in the row item, and let us create more complex logic than what is given out-of-the-box?

GridView

answered on 23 Jun 2017