Questions on UI for WPF Forum

5 answers

172 views

No UpperCase Input when UpdateValueEvent is LostFocus

Hello,

I have a problem with the RadMaskedTextInput-Control.

When I set the UpdateValueEvent-Property to LostFocus, then the input isn't converted to UpperCase anymore.

My xaml looks like this:

<telerik:RadMaskedTextInput Width="140" Height="22"

IsClearButtonVisible="False"

InputBehavior="Replace"

Mask=">X8"

SelectionOnFocus="Unchanged"

TextMode="MaskedText"

UpdateValueEvent="LostFocus"

Value="affeaffe"/>

I defined a ValidationRule to allow only Hex-Value for Input:

public class HexToken : ITokenValidationRule

{

public bool IsRequired

{

get { return false; }

}

public bool IsValid(char ch)

{

return ValidChars.Contains(ch);

}

public char Token

{

get { return 'X'; }

}

public TokenTypes Type

{

get { return TokenTypes.AlphaNumeric; }

}

private string myValidChars = "0123456789abcdefABCDEF";

public string ValidChars

{

get { return myValidChars; }

}

Can you help me with this plz?

regards,

Tobias

MaskedInput (Numeric, DateTime, Text, Currency)

answered on 09 Mar 2021

1 answer

389 views

XamlParseException Could not load file or assembly 'Telerik.Windows.Controls.Data

Hi, I've below xaml code for the RadLegend. The path data is causing the runtime error as could not find the assembly file. Could you please advise?

<telerik:RadLegend x:Name="legends" Items="{Binding LegendItems, ElementName=lineChart}"
FontFamily="Segoe UI"
Margin="2 52 30 20">
<telerik:RadLegend.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" VerticalAlignment="Center">
<CheckBox IsChecked="{Binding Presenter.DataContext.IsVisible, Mode=TwoWay}"></CheckBox> 
<Path Fill="{Binding MarkerFill}" Width="15" Height="15">
<Path.Data>
<Binding Path="ActualMarkerGeometry" RelativeSource="{RelativeSource AncestorType=telerik:LegendItemControl}"></Binding>
</Path.Data>
</Path>
<TextBlock Text="{Binding Title}" />
</StackPanel>
</DataTemplate>
</telerik:RadLegend.ItemTemplate>
</telerik:RadLegend>

Chart

answered on 09 Mar 2021

1 answer

97 views

Exception in RibbonView

Hi Telerik!

We've had RibbonView deployed without problem for many years, I believe running Q1 2018.

Now we are getting a strange exception caused by a recursive call / infinite loop:

"System.Windows.Input.MouseDevice.Capture(System.Windows.IInputElement, System.Windows.Input.CaptureMode)",
"Telerik.Windows.Controls.AutoClosePopupWrapper.OnLostMouseCapture(System.Object, System.Windows.Input.MouseEventArgs)",
"System.Windows.RoutedEventArgs.InvokeHandler(System.Delegate, System.Object)",
"System.Windows.RoutedEventHandlerInfo.InvokeHandler(System.Object, System.Windows.RoutedEventArgs)",
"System.Windows.EventRoute.InvokeHandlersImpl(System.Object, System.Windows.RoutedEventArgs, Boolean)",
"System.Windows.UIElement.RaiseEventImpl(System.Windows.DependencyObject, System.Windows.RoutedEventArgs)",
"System.Windows.UIElement.RaiseTrustedEvent(System.Windows.RoutedEventArgs)",
"System.Windows.Input.InputManager.ProcessStagingArea()",
"System.Windows.Input.InputManager.ProcessInput(System.Windows.Input.InputEventArgs)",
"System.Windows.Input.MouseDevice.ChangeMouseCapture(System.Windows.IInputElement, System.Windows.Input.IMouseInputProvider, System.Windows.Input.CaptureMode, Int32)"

Any ideas?

Thanks

Pete

RibbonView and RibbonWindow

answered on 09 Mar 2021

3 answers

156 views

Docking.LoadLayout clear collection of QueryableCollectionView.FilterDescriptions

We have a WPF MVVM application.. use QueryableCollectionView for filtering items from two collections.

QCV created in VM... and also added FilterDescription to it.

RadGridView used QCV as ItemsSource.

View with RadGridView also used RadDocking and in Loaded handler there restore DockingLayout via call Docking.LoadLayout(fileStream)

We found that this operation affect on clear FilterDescriptions from QCV.

How it possible to avoid it?

GridView

answered on 09 Mar 2021

1 answer

156 views

RadButton not visible on Project Load

When this project is loaded in debug mode the RadButton is not visible, however if I Comment out the code for the button during debug, save it, uncomment the code and save again - T

<Window x:Class="ButtonsDisappear.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"

Title="MainWindow"

Height="600"

Width="800"

WindowState="Maximized">

<Grid>

<Grid.RowDefinitions>

<RowDefinition Height="35"/>

<RowDefinition Height="*"/>

<RowDefinition Height="35"/>

</Grid.RowDefinitions>

<Grid.ColumnDefinitions>

<ColumnDefinition Width="*"/>

</Grid.ColumnDefinitions>

<Grid Grid.Row="2" Grid.Column="0">

<Grid.RowDefinitions>

<RowDefinition x:Name="gridRow2" Height="*"/>

</Grid.RowDefinitions>

<Grid.ColumnDefinitions>

<ColumnDefinition x:Name="gridColumn0" Width="*"/>

<ColumnDefinition x:Name="gridColumn1" Width="*"/>

</Grid.ColumnDefinitions>

<telerik:RadButton Grid.Row="0" Grid.Column="0"

x:Name="radButton"

Content="Test Button"

HorizontalAlignment="Center"

VerticalAlignment="Center"

Width="{Binding ElementName=gridColumn0, Path=ActualWidth}"

Height="{Binding ElementName=gridRow2, Path=ActualHeight}"

Click="radButton_Click"/>

</Grid>

</Window>

using System.Windows;

using Telerik.Windows.Controls;

namespace ButtonsDisappear

{

/// <summary>

/// Interaction logic for MainWindow.xaml

/// </summary>

public partial class MainWindow : Window

{

public MainWindow()

{

InitializeComponent();

}

private void radButton_Click(object sender, RoutedEventArgs e)

{

RadButton b = (RadButton)sender;

}

he button becomes visible...

Buttons

answered on 08 Mar 2021

1 answer

93 views

WebBrowser and RadWindow theme error

Hello, good afternoon with everyone, I have a small query, I am working with RadWindow as parent container, and on this I open several UserControls, in one of these UserControls I have a WPF WebBrowser, but nothing is shown, only a white screen, when I set AllowTransparency = "False" in RadWindow, it shows perfectly, but I lose the transparency of the theme applied to RadWindow (telerik: StyleManager.Theme = "Fluent"), how can I keep the original design of the applied theme and keep the webBrowser working ?

General Discussions

answered on 08 Mar 2021

1 answer

90 views

Get the value with MVVM

How do I get the selected value when I am using MVVM?

I have tried this:

<telerik:RadColorEditor SelectedColor="{Binding SelectedColor, Mode=TwoWay}" ColorMode="RGB" />

but it doesn't give me anything back.

ColorEditor

answered on 08 Mar 2021

3 answers

757 views

Customize Drag Drop Visual

I am using the "UI for WPF Q1 2016" release, WPF, .NET Framework 4.6.1, Windows 10 and C#.

I am trying to implement drag and drop within a single RadTreeView. The default drag visual has a great structure, but has some problems for me. (The background of the drag item is dark and I can't read the dragged item's name, and the drop tooltip seems to be calling ToString() on my viewmodel, and that is not the text that I want.)

Researching, the page "Customize the TreeViewDragVisual" (https://docs.telerik.com/devtools/wpf/controls/radtreeview/how-to/customize-treeviewdragvisual)
tells me to derive from RadTreeView and to modify the template. But I am using NoXaml binaries and this page indicates that I must set the control template in app.xaml. Therefore it will apply to all RadTreeViews, and this doesn't seem like what I want to do.

Then I find the forum post on modifying the tooltip (https://www.telerik.com/forums/treeview---how-to-modify-the-drag-drop-drag-tooltip-target-part)
which points me at the DragDropManager. The manager has a "Set Drag Visual" topic (https://docs.telerik.com/devtools/wpf/controls/dragdropmanager/how-to/dragdrompmanager-howto-set-drag-visual) which says to handle DragDropManager.AddDragInitializeHandler and create a new drag visual in
the handler. This seems better than modifying app.xaml.

Also DragDropManager has the topic "Customizing the DragVisual" (https://docs.telerik.com/devtools/wpf/controls/dragdropmanager/behaviors/customizingdragvisual) which talks about implementing IDragVisualProvider. But the example is for ListBox and I'm using a RadTreeView.

So I'm all kinds of confused.

First, I need to fix the drag visual. I like the Drop Preview Line, the Drag Preview, and the Drag Tooltip parts. I need to change the Drag Preview and the Drag Tooltip.

Then I need to handle the "drop", which I think is done by attaching my own handler to DragDropManager.Drop event.

Thanks for any help.

-John.

TreeView

answered on 05 Mar 2021

1 answer

288 views

List items horizontally

Hi,

I have List<Class> Classes, and List<Student> Students in each Class. I would like to show classes in different columns and students in different rows like the table below. Is it possible to do it by binding Classes to ItemsSource of RadGridView and make the items list horizontally?

Class 1 Class 2 Class 3 Class 4
Andy Barry Cathy Darren
Eric Frank Gary Helen
Iris Jason Kyle Leon
Mary Neil Oscar Peter

Thanks,

David

GridView

answered on 05 Mar 2021

1 answer

129 views

MindMap Vertical layout, what is the logic behind it?

Hi,

I'm trying to create a vertical tree in the RadDiagram with two wings.

Both wings will consist of multiple items. I've looked at your example and it seems to me that it's randomized which items get displayed above and under.

One solution I had in mind was to make two trees. One with TreeUp and the other with TreeDown. Somehow combine the roots of both trees together, but I still haven't figured out how to do this / or if this is even possible.

Is there a solution to this?

Any help would be appreciated. Thanks

Diagram

answered on 05 Mar 2021