Questions on UI for WPF Forum

1 answer

111 views

Drag & Drop between two ListBoxes... DropInfo

HI,

i'm using RadControls for WPF Q1 2012 SP1 + c# to create my application. The problem i have:

I use two listboxes wich are bind to an observableCollection. Now i want to drag an item from listbox A to listbox B
what is quiet simple. But on Drop in listbox B i want to save changes in my database. how do i get the information
isdropped, which item is dropped,...?

I tried the Drop (drop="myDropEvent") Event from the listbox, but that was not helpfull.

Thanks
regards
Rene

DragAndDrop

answered on 17 May 2012

3 answers

114 views

Displaying three columns in one column

Hello,

I am trying to display 3 columns in one.
The result must be like this http://imageshack.us/photo/my-images/560/headergbiv.png/
Because the number of columns to display is variable the TreeListView is completly created in C#.
Is it possible to create such headers in this case?

Thank you

TreeListView

answered on 17 May 2012

1 answer

120 views

SnapBehavior for Resources

I know how to implement a SnapBehavior for a ViewDefinition. But is there a way to implement different SnapBehaviors for different resources in the same view?

ScheduleView

answered on 17 May 2012

3 answers

202 views

Asynchrounous loading of tile view- best practice suggestions please

I am using the radTileview that has lots of child controls in each tileitem . The itemsource of the tileview can be potentially very large ( in millions). If I try to load all the tiles, the ui hangs and it takes too long. So what I want to do is read the first 10 data items for the first 10 tileitems from my datasource and show it on the screen and then in the background keep populating the datasource model ( which is an observable collection ). As the datasource gets populated, the tileview should refresh and show the new items.
I tried the following
1. Creating the data source on a background thread, but this does not refresh the ui
2. Using the dispatcherTimer, but the behaviour is quite random. It refreshes the first lot of data and then the screen blanks out

I have set the following properties on the tileview

IsAutoScrollingEnabled

="True" IsVirtualizing="True"

Please can you suggest some best practises and I would be very obliged if you can send me some sample / example code. The tile view

Many thanks,
Subarna

TileView

answered on 17 May 2012

1 answer

152 views

RadCartesianChart throws exception

Hi,

I got following exception when I drop the the RadChartesianChart to the empty WPF project, move it and then resizing the chart size in design time?!

System.InvalidOperationException

Cannot set a property on object 'System.Windows.Media.TranslateTransform' because it is in a read-only state.

at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, Boolean coerceWithCurrentValue, OperationType operationType, Boolean isInternal) at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value) at Telerik.Windows.Controls.ChartView.CartesianAxis.UpdateAxisLine(ChartLayoutContext context) in c:\TB\105\WPF_Scrum\Release_WPF\Sources\Development\Controls\Chart\Visualization\Common\CartesianAxis.cs:line 78 at Telerik.Windows.Controls.ChartView.LineAxis.UpdateUICore(ChartLayoutContext context) in c:\TB\105\WPF_Scrum\Release_WPF\Sources\Development\Controls\Chart\Visualization\Common\LineAxis.cs:line 64 at Telerik.Windows.Controls.ChartView.PresenterBase.UpdateUI(ChartLayoutContext context) in c:\TB\105\WPF_Scrum\Release_WPF\Sources\Development\Controls\Chart\Visualization\Common\PresenterBase.cs:line 204 at Telerik.Windows.Controls.ChartView.RadChartBase.UpdateUICore(ChartLayoutContext context) in c:\TB\105\WPF_Scrum\Release_WPF\Sources\Development\Controls\Chart\Visualization\RadChartBase.cs:line 461 at Telerik.Windows.Controls.ChartView.PresenterBase.UpdateUI(ChartLayoutContext context) in c:\TB\105\WPF_Scrum\Release_WPF\Sources\Development\Controls\Chart\Visualization\Common\PresenterBase.cs:line 204 at Telerik.Windows.Controls.ChartView.RadChartBase.CallUpdateUI() in c:\TB\105\WPF_Scrum\Release_WPF\Sources\Development\Controls\Chart\Visualization\RadChartBase.cs:line 1001 at Telerik.Windows.Controls.ChartView.RadChartBase.ArrangeOverride(Size finalSize) in c:\TB\105\WPF_Scrum\Release_WPF\Sources\Development\Controls\Chart\Visualization\RadChartBase.cs:line 708

....

XAML:

<Grid>

<telerik:RadCartesianChart HorizontalAlignment="Left" Margin="12,12,0,0" Name="radCartesianChart1" VerticalAlignment="Top" Height="265" Width="453">

<telerik:RadCartesianChart.HorizontalAxis>

<telerik:CategoricalAxis />

</telerik:RadCartesianChart.HorizontalAxis>

<telerik:RadCartesianChart.VerticalAxis>

<telerik:LinearAxis />

</telerik:RadCartesianChart.VerticalAxis>

<telerik:BarSeries>

<telerik:BarSeries.DataPoints>

<telerik:CategoricalDataPoint Label="10" Value="10" />

<telerik:CategoricalDataPoint Label="20" Value="20" />

<telerik:CategoricalDataPoint Label="30" Value="30" />

</telerik:BarSeries.DataPoints>

</telerik:BarSeries>

</telerik:RadCartesianChart>

</Grid>

I'm using 2012.1.326.40 version of radControls

What could be the reason?

Regards,
Auvo

ChartView

answered on 17 May 2012

9 answers

246 views

How to customize the default behavior of the RadTreeView

Hello everybody :)

My scenario is the following:

I have a TreeView with services grouped by category just like this:

Cateogory 1:

Service 1

Service 2

Category 2:

Service 3

Service 4:

And another empty TreeView. The user can drag and drop services from the "services-tree" to the "empty-tree".

I have set the IsDragDropEnable = true, and the default behavior is great but I want to customize the default behavior of the TreeView to achieve the following:

1.- When the user drag an drop successfully a service, this service should not be removed from the "service-tree".

2.- Prevent that the user drop the same service into the "empty-tree" more than once. The "empty-tree" cannot host the same item more than once.

3.- Allow that the user reorder the services on the "empty-tree", i.e. allow drag and drop for the items of the "empty-tree" before or after it current position but no inside of each other.

Can you tell me please which events I have to handle to achieve this behavior? If possible I really appreciate if you add some code snippets.

Is this possible?

I hope you can help me.

Best Regards

Jorge

TreeView

answered on 17 May 2012

10 answers

404 views

Get Caret Position to Set Location of ListBox (Autocomplete/Intellisense)

Good afternoon,

I'm trying to build my own Autocomplete (intellisense) RadRichTextBox. For the autocomplete popup I'm using your RadListView.

Grid>

<Grid.ColumnDefinitions>

<ColumnDefinition />

</Grid.ColumnDefinitions>

<telerik:RadRichTextBox x:Name="radRichTextBox" AcceptsReturn="True" Width="800" Margin="10" Grid.Column="0" DocumentContentChanged="radRichTextBox_DocumentContentChanged">

<telerik:RadRichTextBox.Effect>

<DropShadowEffect ShadowDepth="10" Color="Gray" Opacity=".4" Direction="320" RenderingBias="Performance" />

</telerik:RadRichTextBox.Effect>

<telerik:RadRichTextBox.LayoutTransform>

<ScaleTransform ScaleX="{Binding ElementName=Scale, Path=Value}" ScaleY="{Binding ElementName=Scale, Path=Value}" />

</telerik:RadRichTextBox.LayoutTransform>

<telerik:RadDocument x:Name="radDocument" />

</telerik:RadRichTextBox>

<telerik:RadListBox Width="100" Height="100">

<ListBoxItem Content="Item 1" />

<ListBoxItem Content="Item 2" />

<ListBoxItem Content="Item 3" />

<ListBoxItem Content="Item 4" />

</telerik:RadListBox>

</Grid>

Do you know how I can get the caret position and set the RadListBox position next to it / slightly offset?

Thank you very much for your time,

Rob

RichTextBox

answered on 16 May 2012

1 answer

78 views

Export Html Tags instead of Style

We are using HtmlFormatProvider to export the content of a RichTextBox, you can set the styles to be exported Inline instead of creating classes, but, is there a way to export it on Html markup only?
<i>tag</i>
instead of
<span style="font-style: italic"> tag</span>
Thanks in advance

RichTextBox

answered on 16 May 2012

2 answers

349 views

Reverse checkbox binding

I know this is an odd request and probably not Ideal but is there anyway to set a wpf checkbox to be checked when the binding value is false and unchecked when it is true? The checkbox is bound to a field in a database object and because of a legacy application I can't just reverse the values in the table.

General Discussions

answered on 16 May 2012

2 answers

105 views

TextMode not appears and there are strange errors in output console

Good morning,
I've followed the example provided by BreadCrumb control, but when I try to enter in TextMode text path isn't display (BreadCrumb is white).
In my output console there are two strange errors:
1) "System.Windows.Data Error: 25 : ItemTemplate and ItemTemplateSelector are not valid for item.; Type='RadBreadcrumbBarItem'"; it occurs at application startup.
2) "System.Windows.Data Error: 2 : Cannot find governing FrameworkElement or FrameworkContentElement for target element. BindingExpression:Path=(0); DataItem=null; target element is 'RotateTransform' (HashCode=36078627); target property is 'Angle' (type 'Double')"; it occurs if I try to enter in TextMode.

Could you help me?

NOTE: problems occur with dlls version 2012.1.0326.35 and also with the last nightly build 2012.1.0507.35
NOTE 2: my program is build on Framework 3.5 and I'm using telerik dll for 3.5 (but I've tested also with 4.0 but problems persist)

BreadCrumb

answered on 16 May 2012