Questions on UI for WPF Forum

4 answers

195 views

Hello. I have big problem with gridView perfomance. I have my MDI container like - Grid->ScrollViewer -> Canvas. I add ContentControls to the canvas. ContenControls has next structure: Grid -> Grid -> RadBusyIndicator -> GridView. All grids has Height="*". I read next article - http://www.telerik.com/help/silverlight/gridview-troubleshooting-performance.html and I have question. Can ScrollViewer slow my GridView?

GridView

answered on 20 Feb 2013

2 answers

512 views

Programmatically set SelectedItem(s)

I am using a RadAutoCompleteBox to list/select an assigned user to an object. The data is unbound and the itemssource is generated by polling an Active Directory tree. When an item is selected, the value is stored in the property of the datacontext as the principal's SID. My problem is that when I later access the object, I cannot set the SelectedItem of the RadAutoCompleteBox to one of the principals in the list and I have to resort to setting the SearchText which still pops up the suggested values when the control receives focus. I would like to be able to set the SelectedItem instead so this does not happen.

In the Page.xaml

<telerik:RadAutoCompleteBox

x:Name="PrincipalAutoCompleteBox"

WatermarkContent="Select a principal"

TextSearchMode="Contains"

AutoCompleteMode="SuggestAppend"

SelectionMode="Single"

TextSearchPath="Name"

DropDownItemTemplate="{StaticResource ResourceKey=DSPrincipalAutoComplete}"

DropDownWidth="Auto"

FilteringBehavior="{StaticResource ResourceKey=CustomFilteringBehaviour}"

GotFocus="PrincipalAutoCompleteBox_GotFocus"

KeyDown="PrincipalAutoCompleteBox_KeyDown"

Populated="PrincipalAutoCompleteBox_Populated"

/>

In the Page.xaml.vb

Private Sub PrincipalAutoCompleteBox_GotFocus(sender As System.Object, e As System.Windows.RoutedEventArgs)

Dim autoComplete As RadAutoCompleteBox = DirectCast(sender, RadAutoCompleteBox)

Dim searchString As String = autoComplete.SearchText

If autoComplete.SelectedItem IsNot Nothing Then

searchString = BindingExpressionHelper.GetValue(autoComplete.SelectedItem, autoComplete.DisplayMemberPath).ToString()

End If

autoComplete.IsDropDownOpen = False

autoComplete.Populate(searchString)

End Sub

Private lastFilteredItems As IEnumerable(Of Object)

Private Sub PrincipalAutoCompleteBox_KeyDown(sender As System.Object, e As System.Windows.Input.KeyEventArgs)

Dim autoCompleteBox As RadAutoCompleteBox = DirectCast(sender, RadAutoCompleteBox)

If e.Key = Key.Tab AndAlso e.Handled = False AndAlso autoCompleteBox.SelectedItem Is Nothing Then

If lastFilteredItems.Count = 1 Then

autoCompleteBox.SelectedItem = lastFilteredItems.OfType(Of Object).FirstOrDefault

Else

autoCompleteBox.SearchText = Nothing

End If

End Sub

Private Sub PrincipalAutoCompleteBox_Populated(sender As System.Object, e As System.EventArgs)

Me.lastFilteredItems = DirectCast(sender, RadAutoCompleteBox).FilteredItems

End Sub

And the custom filter

Public Class CustomFilteringBehaviour

Inherits Telerik.Windows.Controls.FilteringBehavior

Public Overrides Function FindMatchingItems(searchText As String, items As System.Collections.IList, escapedItems As System.Collections.Generic.IEnumerable(Of Object), textSearchPath As String, textSearchMode As Telerik.Windows.Controls.TextSearchMode) As System.Collections.Generic.IEnumerable(Of Object)

If String.IsNullOrEmpty(searchText) Then

Return items.OfType(Of Object).Where(Function(x) Not escapedItems.Contains(x))

Else

Return MyBase.FindMatchingItems(searchText, items, escapedItems, textSearchPath, textSearchMode)

End If

End Function

End Class

Finally, the code where I populate the the list and attempted to preselect an item based on the datacontext

'^-- principalList As ObservableCollection(Of DSPrincipal) and then populated from AD

PrincipalAutoCompleteBox.ItemsSource = principalList

For Each principal As DSPrincipal In principalList

If principal.Sid = DirectCast(Me.DataContext, MyObject).Principal.SID Then

'v-- What I tried to do but it threw an error

'PrincipalAutoCompleteBox.SelectedItem = principal

'v-- What I ended up doing

PrincipalAutoCompleteBox.SearchText = _principal.Name

Exit For

End If

Next

Is it possible to set SelectedItem in some way? Would binding SelectedItem to the property allow it to display automatically when the datacontext changes? What I have works but I would like a consistant experience for my user where the suggested items do not pop up when the value has been set previously.

Thanks,
Jason

AutoCompleteBox

answered on 20 Feb 2013

1 answer

115 views

Filtering with converter applied to datamemberbinding

Hi,

I have applied a converter to DataMemberBinding, but filter doesn't take this converter into account..
Checkboxes that appear in filtering control shows the values that are displayed (after calling converter), but typing the same values in textbox that is shown below doesn't filter on those displayed values.

Is there a way to achieve the filtering based on the converted values from the textbox.

Thanks,
Pankaj

GridView

answered on 20 Feb 2013

4 answers

1.1K+ views

Apply converter to GridViewDataColumn

How to apply converter to a GridViewDataColumn??
I have a column for which i need to truncate the display of string after particular delimiter.
Should we use a Converter, if so how? or else how can we trim the string??

GridView

answered on 20 Feb 2013

1 answer

68 views

RibbonView w/ Windows 8 theme RD - Blend with Sketchflow for VS 2012 preview crashing

I've created a resource dictionary RadRibbon and copied/pasted the resources from the NET40 implicit style resource dictionary. Visual studio 2012 renders & builds fine, but Blend crashes whenever I open the project. When I debug blend with vs 2012, it reports:

'{DependencyProperty.UnsetValue}' is not a valid value for the 'Telerik.Windows.Controls.RadRibbonGallery.Icon' property on a Setter.

Please advise.

RibbonView and RibbonWindow

answered on 20 Feb 2013

1 answer

132 views

Remove the ScrollPositionIndicator tooltip entirely

Hello,

I have a RadGridView and need to remove tooltip that appears when scrolling using the slider bar; I think it is called the ScrollPositionIndicator. I have managed to change the column it targets with a new ScrollPositionIndicatorTemplate but I am struggling to remove it entirely. Is there a property I can set to false to make this tooltip not visible?

thanks

GridView

answered on 20 Feb 2013

12 answers

688 views

SumFunction that sums based on another column value

Hello,
in a RadGridView I've some rows that have a field value D and other B, I need to show in the ColunFooter a

Total D :
Total B:

and in another column

Total D value (€)
Total B value (€)

I've tried myself creating a sumfunction but I don't know if I've to create two different (1 for B and 1 for D) or what... can you please provide me a sample?

Thanks

GridView

answered on 19 Feb 2013

4 answers

161 views

About Wrapping GridViewDataColumn Header

Hello,

Now I'm working on localization about DataGrid. And I'm using WPF Localization Extension for multi-language supporting.
At this time I need to change texts for each headers, but It doesn't work.
Below is my code for localization.

<telerik:GridViewDataColumn DataMemberBinding="{Binding}" HeaderCellStyle="{StaticResource GridViewHeaderCellBasic}">

<telerik:GridViewDataColumn.Header>

<TextBlock Text="{lex:Loc LINETOTAL}" TextWrapping="Wrap" />

</telerik:GridViewDataColumn.Header>

</telerik:GridViewDataColumn>

In the above code, {lex:Loc LINETOTAL} means multi-lange ID for Localization. The text of Column header should changed to above text which is linked to LINETOTAL.
But the header text is not showing.

Can you help me out for this problem?

Thank you.

GridView