Questions on UI for WPF Forum

1 answer

333 views

How do I override item selection behaviors in RadtreeView?

Hi,

I'm working on a project where we have a RadTreeView and 3rd party CAD viewer control working off the same business objects (in this case the individual CAD entities). However the difference between the way the CAD viewer does selection and how the TreeView does selection will end up being confusing to customers, and the architect wants the treeview selection method to match the CAD's. For instance, in the CAD clicking on an entity, or drag-selection of multiple entities, without any key modifiers does not de-select already selected items. a key-modified-click or key-modified-drag-selection are what deselect the specific entities. This is the same as other CAD tools.

So I have the task to override RadTreeView's selection methods to mimic these same selection behaviors - so that when you click on a treeviewitem it will select it, but not deselect other items, and a key-modified click will de-select only the items specifically indicated by the user (either individually, or under multiselect). To make things a bit more challenging, we need our treeview to be virtualized, and the RadTreeViewItem's IsSelected property is bound to a "Selected" property of the business objects (each cad entity), following an MVVM design pattern.

So what I'm having trouble finding out is what methods I need to override on RadTreeView (or even RadTreeViewItem?) to change the selection behavior with the mouse/keyboard, but still allow the the RadTreeView to fire the events it does on selection change (we've found these are still important regardless of our databinding due to ui virtualization).

Thanks!

TreeView

answered on 12 Apr 2013

1 answer

154 views

Bind string property to RichTextbox

Hi,
How to bind a string property to the Richtexbox control using MVVM?

Any help would be appreciated!.

Thanks
Raj

RichTextBox

answered on 12 Apr 2013

5 answers

255 views

[Solved] Chart. Cant change color

I use sample from demo:

<telerik:RadCartesianChart Palette="Windows8" Height="Auto" Width="500">

<telerik:RadCartesianChart.Behaviors>

<telerik:ChartTrackBallBehavior ShowIntersectionPoints="True" />

</telerik:RadCartesianChart.Behaviors>

<telerik:AreaSeries CategoryBinding="Category" Fill="#7F8EC448" Stroke="#FF8EC442" StrokeThickness="2" ValueBinding="Value" ItemsSource="{Binding Chart1}">

<telerik:AreaSeries.TrackBallInfoTemplate>

<DataTemplate>

<StackPanel Margin="3" Orientation="Horizontal">

<TextBlock Text="{Binding DataPoint.Category, StringFormat='Spread at {0:HH:mm:ss.f}:'}" Margin="0,0,3,0" />

<TextBlock Text="{Binding DataPoint.Value}" FontWeight="Bold" />

</StackPanel>

</DataTemplate>

</telerik:AreaSeries.TrackBallInfoTemplate>

</telerik:AreaSeries>

<telerik:RadCartesianChart.HorizontalAxis>

<telerik:DateTimeContinuousAxis MajorStepUnit="Second"

LabelInterval="10"

LabelFormat="HH:mm:ss.f" FontFamily="Segoe UI"

PlotMode="OnTicks" />

</telerik:RadCartesianChart.HorizontalAxis>

<telerik:RadCartesianChart.VerticalAxis>

<telerik:LinearAxis FontFamily="Segoe UI">

</telerik:LinearAxis>

</telerik:RadCartesianChart.VerticalAxis>

<telerik:RadCartesianChart.Grid>

<telerik:CartesianChartGrid MajorLinesVisibility="Y" MajorYLineDashArray="3,4" />

</telerik:RadCartesianChart.Grid>

</telerik:RadCartesianChart>

I use DataContext binding:

DataContext = _viewModelMain;

But i cant change color here: Fill="#7F8EC448" Stroke="#FF8EC442". Output window:

System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element. BindingExpression:Path=Color; DataItem=null; target element is 'SolidColorBrush' (HashCode=1226006); target property is 'Color' (type 'Color')

How fix it?

Chart

answered on 12 Apr 2013

3 answers

802 views

Change Expander ToggleButton Image

Hi,

Is there a way to change the Up/Down arrow used by the RadExpander to different images/icons. I would like to use different .png files for Expand and Collapse state.

Thanks,

Mike

Expander

answered on 12 Apr 2013

6 answers

539 views

Selection change prevention

Hi guys,
is there a way to prevent the selection change of nodes? I saw there is only a selectionchanged event which is not much of a help here since the selected node was already changed..
Thanks

TreeView

answered on 12 Apr 2013

1 answer

135 views

Drag and Drop VB examples

Hi,
I'm new to the Telerik family and I'm in the process of developing a prototype to allow the user to drag and drop user controls from one list to another. Each user control in turn has several lists that need to be drag enabled to allow the user to create a team of employees. The functionality is not dissimilar from you DND demo with the countries. I«,ve created the basics but I'm a long way from where I need to be and I'm struggling to figure out what is going on. I'm looking for a few functional examples in VB that will allow me to work out where I am going wrong. Any help would be appreciated.

Thanks

DragAndDrop

answered on 12 Apr 2013

1 answer

170 views

SelectedIndex = 'value' doesn't seem to work

Hi,

I've upgraded to library version 2013.1.403.40.
For some reason I am unable to set the SelectedIndex value in code.

Example:

if (radListBox.SelectedIndex <= -1)

{

radListBox.SelectedIndex = 0;

}

else

{

radListBox.SelectedIndex++;

}

When the SelectedIndex = -1 and I try to set a value of 0, then the SelectedIndex value still remains as -1.
The same applies if I try SelectedIndex++.

Does anyone have suggestions? It used to work before upgrading.

Thanks,

Rob

ListBox

answered on 12 Apr 2013

3 answers

107 views

tab in RowDetails Skipping Control

Hello,
I have a grid where I am programatically setting focus on a control when I add a new row and show details. When I tab to go to the next control in those details, the row selection changes from the row that was selected prior to adding a new record to the record after. If I select the first control with my mouse and hit tab, the focus goes to the next control as is expected. Is there something I should be doing other than setting focus on the control?

Thanks

GridView

answered on 12 Apr 2013

11 answers

203 views

Tab in Rowdetails - Exception

Hello

When I expand a row for its rowdetails by clicking the plus-sign in the GridViewToggleRowDetailsColumn the row is expanded but it does not seem to be "officially" selected. The fonts don't get fat for example. Now when I enter into a textbox with my mouse and then press TAB-Key I get an Exception. If I first click on the row and then expand it with the plus-sign I don't have this error. Any suggestions?

Here the Stacktrace:

                     System.NullReferenceException          
               bei Telerik.Windows.Controls.GridView.GridViewDataControl.Move(FocusNavigationDirection navigationDirection)         
               bei Telerik.Windows.Controls.GridView.GridViewDataControl.ExecuteMoveCommands(FocusNavigationDirection direction)         
               bei Telerik.Windows.Controls.GridView.GridViewDataControl.MoveNext()         
               bei Telerik.Windows.Controls.GridView.GridViewDataControl.OnMoveNextCommand(Object sender, ExecutedRoutedEventArgs e)         
               bei System.Windows.Input.CommandBinding.OnExecuted(Object sender, ExecutedRoutedEventArgs e)         

Oh and in the case that the exception does not occur, Tab still doesn't really work - it jumps to the next row instead of jumping to the next TextBox in rowdetails. I already played around with the TabIndex property but didn't find anything. Any idea for that too?

Thanks

GridView

answered on 12 Apr 2013

0 answers

192 views

Drag&Drop and Grouping between 2 RadListBox

Hi, thanks ins advance for reading this

I've been able to reproduce the Drag&Drop and Grouping examples separately. No luck making them work together.

My 2 collections and filling the source list.

Property ProductosTotal As New CollectionViewSource

Property ProductosPedido As New ObservableCollection(Of Productos)

'Called when initializing view

Private Sub LoadProductosTotal()

Dim prods = operacionesProductos.GetAllProductos()

If prods IsNot Nothing Then

ProductosTotal = New CollectionViewSource

ProductosTotal.Source = prods

End If

End Sub

On the Xaml side:

<Style x:Key="DraggableListBoxItem" TargetType="telerik:RadListBoxItem">

<Setter Property="telerik:DragDropManager.AllowCapturedDrag" Value="True" />

</Style>

<telerik:RadListBox Grid.Column="0" ItemContainerStyle="{StaticResource DraggableListBoxItem}"

ItemsSource="{Binding ProductosTotal.View}" ItemTemplate="{StaticResource ListBoxItemTemplate}">

<telerik:RadListBox.GroupStyle >

<GroupStyle>

<GroupStyle.HeaderTemplate>

<DataTemplate>

<StackPanel Height="Auto" Background="{telerik:Windows8Resource ResourceKey=AccentBrush}" Margin="0 5 0 5">

<TextBlock Text="{Binding Name}" FontFamily="Segoe UI Light" FontWeight="Bold" FontSize="16"

Margin="10 3 0 0" Foreground="{telerik:Windows8Resource ResourceKey=MainBrush}"/>

</StackPanel>

</DataTemplate>

</GroupStyle.HeaderTemplate>

</GroupStyle>

</telerik:RadListBox.GroupStyle>

<telerik:RadListBox.DragDropBehavior>

<Behaviors:ListBoxDragDropBehaviorCopy />

</telerik:RadListBox.DragDropBehavior>

<telerik:RadListBox.DragVisualProvider>

<telerik:ScreenshotDragVisualProvider />

</telerik:RadListBox.DragVisualProvider>

</telerik:RadListBox>

<telerik:RadListBox Grid.Row="1" ItemsSource="{Binding ProductosPedido}" AllowDrop="True"

ItemTemplate="{StaticResource ListBoxItemTemplate}">

<telerik:RadListBox.DragDropBehavior >

<telerik:ListBoxDragDropBehavior />

</telerik:RadListBox.DragDropBehavior>

</telerik:RadListBox>

Notice the ListBoxDragDropBehaviorCopy I inherited the ListBoxDragDropBehavior to supress the remove operation because it threw an exception.

I need to copy from the source list, not move, I've tried the DragDropManager but I cant understand completely the documentation.
Could someone point me in the right direction, i feel like is something small what im missing

Thanks again

ListBox

asked on 12 Apr 2013