Questions on UI for WPF Forum

1 answer

89 views

NullReferenceException in DragDropBehaviour<TSTate> class

Hallo,

I use DragDropManager to drag & drop items between RadListBoxe A and RadListBox B. It works good. But it will cause the program crashed when I try following:

Because the RadListBox B is not allowed to have TWO items on the same time, so existing item must be "swap" by new one. I remove the existing item and replaced by new one via code. It works good only when it drops under existing item. And, when I drop the new item before the existing item, the program will be crashed by NullReferenceException, I found the exception caused by DragDropBehaviour<TSTate> class. See screenshots provided.

Please, solutions, urgent.

Tam

DragAndDrop

answered on 22 May 2020

1 answer

148 views

Bottom slider touch friendly

Hello Telerik Team,

How can I resize both thumbs in the slider?
I added a picture, where you an see it better.

I tried with changing width of ThumbStyle, which causes troubles. I cant move the bar completely to the left or right.

Thanks.

TimeBar

answered on 22 May 2020

1 answer

95 views

Remove 'AND' section in GridView column filter

Hello,

Is there a way to remove only the 'AND' section in the grid view`s column filter?

GridView

answered on 22 May 2020

5 answers

151 views

TableOfContents Questions

Hi:

1. How can I create a TOC with links that can go to its source section when I use Ctrl+click?

2. How can I create a TOC that ignores the previous pages (for example : the first three pages)?

3. why I created a TOC ,when the document exported to a pdf file, something changed(see the attach files )

RichTextBox

answered on 21 May 2020

4 answers

98 views

Design view poup inside xaml

I am not sure this is the place, but it's driving me crazy.

In my xaml code, when I click the code for RadComboBox, I get a popup (see attached image).

If I click the popup I am sent to the design view (see attached). When I click the xaml tab I am redirected back to the design view after seeing the xaml code for a split second.

Does anyone know waht it might be that is causing this behavior?

Thanks in advance!

ComboBox

answered on 21 May 2020

6 answers

106 views

Loading 50 rows into the RadGridView takes about 1.100 ms

Hi,

we are following all the tips from https://docs.telerik.com/devtools/wpf/controls/radgridview/performance/tips-tricks but we only get a poor performance when filling the grid.

Do you have any further tips for me? I can send a sample app to showcase our problem.

Greetings

Andre

GridView

answered on 20 May 2020

1 answer

181 views

One item template definition for hierachical data template?

I do not know if I have defined question correctly, sorry for my lack of experience. Application I work on have a TreeView that is connected to data source. Data is hierarchical. There are root element and every root element can have children. Any children can have multiple other children. I have figured out how to data bind and show hierarchical data. Problem is that I need to style treeview items. I have figured out how to set itemtemplate on root and children in xaml. But now I have two copies of item template. One in ItemTemplate and another in its's hierachical item template. But they are identical, as I understand MVVM this could be an issue when I try to implement something more complex. Is there some elegant way to have this defined in one place and then shared on item template root and then it's children?

Here is the code of my TreeView in XAML:

<HierarchicalDataTemplate x:Key="HostsTemplatekey" ItemsSource="{Binding Children}" >

<StackPanel Orientation="Horizontal" telerik:RadContextMenu.ContextMenu="{StaticResource TreeViewContextMenu}" >

<iconPacks:PackIconFeatherIcons Kind="Trash2" Width="20" Height="20" Visibility="{Binding Converter={StaticResource FileTypeToIconPackVisibilityConverter}, ConverterParameter= 3}" />

<TextBlock Width="10" />

<Grid>

<TextBlock Text="{Binding cityname}" VerticalAlignment="Center" FontSize="{StaticResource BaseCaptionFontSize }" />

</Grid>

</StackPanel>

<HierarchicalDataTemplate.ItemTemplate>

<HierarchicalDataTemplate ItemsSource="{Binding Children}" >

<StackPanel Orientation="Horizontal" telerik:RadContextMenu.ContextMenu="{StaticResource TreeViewContextMenu}">

<iconPacks:PackIconFeatherIcons Kind="Trash2" Width="20" Height="20" Visibility="{Binding Converter={StaticResource FileTypeToIconPackVisibilityConverter}, ConverterParameter= 3}" />

<TextBlock Width="10" />

<Grid>

<TextBlock Text="{Binding cityname}" VerticalAlignment="Center" FontSize="{StaticResource BaseCaptionFontSize }" />

</Grid>

</StackPanel>

</HierarchicalDataTemplate>

</HierarchicalDataTemplate.ItemTemplate>

</HierarchicalDataTemplate>

<telerik:RadTreeView

Name="dgCities" Margin="10"

ItemsSource="{Binding data.CitiesCollection}"

IsEditable="True"

ItemTemplate="{StaticResource HostsTemplatekey}"

SelectedItem="{Binding data.SelectedCity, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}"

IsDragDropEnabled="True"

/>

General Discussions

answered on 20 May 2020

1 answer

142 views

Is there an equivalent to CheckFileExists in RadOpenFileDialog?

In the native Microsoft.Win32.OpenFileDialog, there is a property called CheckFileExists, which can be set to false to allow you to choose a file that doesn't exist from the open dialog for being able to make new files. But RadOpenFileDialog seems to require a file to exist and I'm not seeing an equivalent for this in RadOpenFileDialog. Is there an equivalent or some way to get this behavior?

FileDialogs

answered on 20 May 2020

1 answer

135 views

Diagram custom shapes

I have different shapes which I drag from toolbox to diagram.

For example:

-Shape.name1

-Shape.name2

-Shape.name3

What I want to do is on the diagram:

Move Shape1 to shape 2. So, Shape 1 bottom is connected to shape 2 top. (without connectors)

Shape 3 top should be only allowed to dock on shape 2 bottom.

All shapes have the same size.

Can anybody provide me some code examples for this?

Diagram

answered on 20 May 2020

32 answers

1.0K+ views

Filter button

Hello,

How can I get hold of a reference to the Filter popup and the Filter button? The reason I need this is that I want to respond to the click event of the button by closing the Filter popup.

I do not want to use the Filtered event on the RadGridView as that one is raised even when clicking on the check boxes.

I suppose using FindName on the Template would get the job done, but what is the template name for Filter popup?

Thank you.

GridView

answered on 20 May 2020