Questions on UI for WPF Forum

8 answers

867 views

Virtualization and Bring[Item/Index]IntoView problems

Hi, I have the following RadTreeView:

<tc:RadTreeView x:Name="tree"

ItemsSource="{Binding CategoryCollectionView, UpdateSourceTrigger=PropertyChanged}"

SelectionChanged="RadTreeView_SelectionChanged"

LoadOnDemand="tree_LoadOnDemand"

IsVirtualizing="True"

tc:TreeViewPanel.VirtualizationMode="Standard"

ta:AnimationManager.IsAnimationEnabled="False"

IsDragTooltipEnabled="False"

IsDragDropEnabled="True"

SelectionMode="Multiple">

<tc:RadTreeView.Resources>

<Style TargetType="{x:Type ScrollBar}" />

<HierarchicalDataTemplate DataType="{x:Type local:CategoryTreeItemViewModel}"

ItemsSource="{Binding ChildrenCollectionView}">

</HierarchicalDataTemplate>

<DataTemplate DataType="{x:Type local:EventNodeViewModel}">

</DataTemplate>

</tc:RadTreeView.Resources>

<tc:RadTreeView.ItemContainerStyle>

<Style TargetType="{x:Type tc:RadTreeViewItem}">

<Setter Property="IsExpanded"

Value="{Binding IsExpanded, Mode=TwoWay}" />

<Setter Property="IsSelected"

Value="{Binding IsSelected, Mode=TwoWay}" />

<Style.Triggers>

<DataTrigger Binding="{Binding DataContext.IsMainCategoryTree, ElementName=tree}"

Value="True">

<Setter Property="IsLoadOnDemandEnabled"

Value="{Binding LoadOnDemand}" />

</DataTrigger>

</Style.Triggers>

</Style>

</tc:RadTreeView.ItemContainerStyle>

</tc:RadTreeView>

I am doing a refresh of the tree using a button which recreates all the item ViewModels in the tree and then I am attempting to restore the state of the tree i.e. expand previously expanded nodes and set previously selected item. This is all done from within the tree's ViewModel.

This all works fine as long as the user has not scrolled down. Unfortunately, when the user has scrolled down and a refresh happens, the user will then only see the root nodes (not expanded) unless they scroll back up to the top of the tree.

In order to work around this I subscribed to the tree's ItemContainerGenerator.StatusChanged event after refreshing the data to check when the items are finished generating and then I used the BringItemIntoView or BringIndexIntoView methods to bring to the selected item into view.

However, this doesn't currently work due to the following exception being thrown when either of these methods are called.:
Cannot call StartAt when content generation is in progress.

Any help would be appreciated with this problem,

Thanks,

A.

TreeView

answered on 27 Sep 2017

1 answer

248 views

[Solved] RadVirtualGrid with Custom DataProvider

Hello, I'm using RadVirtualGrid with Custom DataProvider, how do I configure the display of not all columns from my collection?

VirtualGrid

answered on 27 Sep 2017

3 answers

561 views

[Solved] MVVM Different ViewModel for each WizardPage

I am creating a ViewModel for a Window with a kendo Wizzard control on it. The ViewModel is getting very big because I 5 pages in my wizzard. Is there a way to bind a ViewModel to a page.

Sorry I am new to WPF and MVVM.

Basically I have something like this.

</telerik:WizardPage>

<telerik:WizardPage Name="LicenseKeyPage" SideHeaderWidth="120" AllowNext="{Binding CanLicenseKeyPageNext}">

</telerik:WizardPage>

<telerik:WizardPage Name="DatabasePage" SideHeaderWidth="120" AllowNext="{Binding CanDatabasePageNext}">

</telerik:WizardPage>

<telerik:CompletionWizardPage Name="InstallationPage" SideHeaderWidth="120" AllowHelp="False">

</telerik:CompletionWizardPage>
</telerik:RadWizard>
</DockPanel>
</Grid>
</Window>

Wizard

answered on 26 Sep 2017

8 answers

339 views

[Solved] StepLine series

Hello,

Is there some way to plot Stepline series and Line series on the same graph ? I have a cartesian chart with several line and area series and I would like to add stepline serie without modifying my data (e.g. without adding a Y value at each X to have the constant line).

Another question, is it possible to change the base line of an area series so that color fill stops at a specific Y value ?

ChartView

answered on 26 Sep 2017

5 answers

208 views

[Solved] Bar chart bars are very thin for some datasets!

Hi,

Sometimes the bars are extremely thin for some sparse datasets. When I display a bar chart with a DateTimeContinuousAxis horizontal axis, spanning just a few hours with only 2 or 3 items, the bars are extremely thin. If I change the timespan to a day, also with just a few items, the bars look normal (see attached screenshots). I'm using UI for WPF Q2 2016, Is this s bug?

Thanks,

Brian

ChartView

answered on 26 Sep 2017

3 answers

589 views

Data Annotations Date Format

I am sure this was working but I am not seeing the correct output now:

Row Data Context Property

[Display(Name = "Start Date")]

[DisplayFormat(DataFormatString = "{0:d}")]

public DateTime ClaimDate { get; set; }

XAML in the View

<telerik:RadGridView VerticalAlignment="Stretch" CanUserDeleteRows="False" CanUserFreezeColumns="False" CanUserInsertRows="False" CanUserReorderColumns="False" CanUserSearch="False" ShowGroupPanel="False"

ShowSearchPanel="False" ItemsSource="{Binding Data.ItemsSource}" BorderBrush="Transparent" IsReadOnly="True" ShowToolTipOnTrimmedText="True" RowIndicatorVisibility="Collapsed"

SelectionMode="Single" IsFilteringAllowed="False" AlternationCount="2">

</telerik:RadGridView>

C# Interactive Window

> DateTime.Today.ToString("d")

"05/09/2017"

Screenshots are attached.

Any ideas?

Thanks,
Maurice

GridView

answered on 26 Sep 2017

2 answers

312 views

Bind SelectedColor to Rectangle inside RadColorPicker

Hello Sirs,

I'm trying to show the selectedColor/selectedItem in a rectangle which is inside my RadColorPicker.

<Style TargetType="telerik:RadColorPicker"
x:Name="colorPicker"
BasedOn="{StaticResource StandardInputControlStyle}"
>
<Setter Property="Margin" Value="5,0,10,5"></Setter>

<Setter Property="ContentTemplate">

<Setter.Value>
<DataTemplate>
<TextBlock>
<Rectangle HorizontalAlignment="Center"
VerticalAlignment="Center"
Width="108"
Height="23"
x:Name="Rectangle"
Fill="{Binding ElementName=colorPicker, Path=SelectedColor}">
</Rectangle>
</TextBlock>
</DataTemplate>
</Setter.Value>
</Setter>
</Style>

ColorPicker

answered on 25 Sep 2017

2 answers

209 views

PushPin

Hi Admin

I have a map with markers(PushPins) in it. Now I want to add titles(place) on top of each marker to distinguish then. I was hoping to get some help with that.

Thanks in andvance

Map

answered on 25 Sep 2017

2 answers

350 views

[Solved] how to re-apply StyleSelector and TemplateSelector on GridViewRow

I have some columns with `CellStyleSelector` and `CellTemplateSelector` which associating with a property in row data, when the property changed in code behide, both StyleSelector and TemplateSelector are not refreshed.

now I have got the row which need to refresh from `ItemContainerGenerator`, but have no idea to do that.

RadGridView.Rebind() works but it might be a little heavy.

public void RefreshRowTheme(object rowData)

{

var container = this.grid.ItemContainerGenerator.ContainerFromItem(rowData);

if (container != null)

{

var row = container as GridViewRow;

if (row != null)

{

//how to re-apply StyleSelector and TemplateSelector on all cells

}