Questions on UI for WPF Forum

3 answers

253 views

ComboBoxColumn drop down width

I'm looking for a way to set the drop-down width for a ComboBoxCoumn to the same width of the column.

GridView

answered on 08 Oct 2012

1 answer

116 views

read a value in selected cell

Hello
i need to read/capture a value belongs to the cell selected in gridview
in the second time i need to generate an event when i click on one cells,this event return a value that belongs to the cell selected
can you help me plz

GridView

answered on 08 Oct 2012

1 answer

151 views

ControlTemplate.Trigger on StyleManager.Theme

I'm trying to avoid a lot of custom work with themes because all I want to do is change the Header BorderBrush used on various controls. I was hoping I could do this as in the following snippet from a RadCalendar Style in my ResourceDictionary...

<ControlTemplate TargetType="{x:Type telerik:RadCalendar}">

<Grid>

</Grid>

<ControlTemplate.Triggers>

<Trigger Property="telerik:StyleManager.Theme"

Value="telerik:Office_Black">

<Setter TargetName="Navigation"

Property="Background">

<Setter.Value>

<LinearGradientBrush EndPoint="0.5,1"

StartPoint="0.5,0">

<GradientStop Color="#FF5B5B5B"

Offset="1" />

<GradientStop Color="#FF868686" />

<GradientStop Color="#FF0E0E0E"

Offset="0.449" />

</LinearGradientBrush>

</Setter.Value>

</Setter>

</Trigger>

<Trigger Property="telerik:StyleManager.Theme"

Value="telerik:Office_Blue">

<Setter TargetName="Navigation"

Property="Background"

Value="Blue">

</Setter>

</Trigger>

</ControlTemplate.Triggers>

</ControlTemplate>

And then in my xaml...

<telerik:RadDatePicker Width="300" telerik:StyleManager.Theme="{Binding TelerikTheme}" CalendarStyle="{StaticResource RadCalendarStyle1}"/>

However it doesn't work. Is there anyway to implement something along these lines?

Thanks in advance,
Steve

DatePicker

answered on 08 Oct 2012

2 answers

189 views

[Solved] Disiable context menu/ add radcontextmenu

Hello
I would like to create custom context menu for raddatetimepicker, using rad contextmenu. Hover I cannot asign it. It always diplaying default textbox contextmenu.

DateTimePicker

answered on 08 Oct 2012

4 answers

568 views

Exception in MVVM using BackgroundWorker in the ViewModel

Hello Telerik,

My scenario is this:
I have a client-server application with a tree (RadTreeView), which is data bound with a DataTemplate for the nodes.
Nodes that are not yet expanded don't hold any data, but an invisible child node, so an expander will be displayed.
Expanding the node loads the next level from the server, then removes the child node from the ItemsSource and then adds the new nodes to the ItemsSource.
The WPF application is designed as MVVM.
Since the application has more windows besides the tree, and the response from the server might take a while, the application should not wait for the server. Thus we decided to use a BackgroundWorker in the view model.

private void LoadChildrenBackground()

{

BackgroundWorker backgroundWorker = new BackgroundWorker();

backgroundWorker.DoWork += (sender, args) => _node.Expand();

backgroundWorker.RunWorkerCompleted += (sender, args) =>

{

Children.Clear(); //or Children.Remove(DummyChild); <- here is there problem!

foreach (ITreeNode child in _node.Children)

Children.Add(new TreeViewItemViewModel(child, this, true));

};

backgroundWorker.RunWorkerAsync();

}

Effect:
When I run the program, and expand a few nodes by clicking the expander, the tree runs into a NullReferenceException.
I get this call stack location:
c:\TB\102\WPF_Scrum\Release_WPF\Sources\Development\Controls\Navigation\TreeView\Virtualization\TreeViewPanel.cs' Line 1452

This happens only when a level has more than 405 nodes, and when the background worker is used, and when I remove the dummy child. So I suspect it's a matter of the asynchronous behaviour when removing an Item from the ItemsSource.

I have tried removing the dummy child before and after inserting the new nodes, even after the background worker is finished, it all ends up in the exception.

I can provide a simple example in a Visual Studio solution which demonstrates the effect (17kB zip).
Maybe your developers are interested in the exception, or maybe you have a workaround(?)

I hope you can help me, because when I get the RadTreeView running with our MVVM pattern, my evaluation will be (positively!) complete. Seems like this is the last issue I have :)

TreeView

answered on 08 Oct 2012

2 answers

137 views

Using Book In a PixelSense(Surface) Application

Hi

I'm developing a Surface v2.0 application and I'm using book control to display images (converted from a pdf document). I'm containing the control in a ScatterViewItem to allow the book to be resizable and draggable. This is all working fine.

My problem is when trying to turn the page, any drag motion moves the ScatterViewItem and doesn't turn the page. A Single/Double tap on the corner of the page does turn the page though but isn't intuitive enough to be useful.

Does anyone have experience in using the control in a Surface app and knows how to enable the page turn please (I know it's a bit of a long shot).

I've included the Xaml I'm using below

<s:ScatterView AllowDrop="True" x:Name="myScatter" HorizontalAlignment="Stretch"

VerticalAlignment="Stretch"

Background="Transparent" >

<s:ScatterViewItem Height="500" Width="600">

<telerik:RadBook x:Name="RadBook1" RightPageIndex="1" FirstPagePosition="left" Margin="10">

<telerik:RadBookItem>

<Image Source="pr001.png"/>

</telerik:RadBookItem>

<telerik:RadBookItem>

<Image Source="pr002.png" />

</telerik:RadBookItem>

<telerik:RadBookItem>

<Image Source="pr003.png" />

</telerik:RadBookItem>

<telerik:RadBookItem>

<Image Source="pr004.png"/>

</telerik:RadBookItem>

</telerik:RadBook>

</s:ScatterViewItem

>

            </s:ScatterView>

Book

answered on 08 Oct 2012

13 answers

213 views

Change the behaviour of autocomplete logic.

Hi guys,
I need your professional support.

The current behaviour of autocomplete logic is to complete typed characters with appropriate string value. I would like to have another behaviour if it is possible: when you type the characters, combobox will show all possible items in dropdown menu of the combobox and user will be able to select the item from the filtered list.

Thanks in advance,
Julian

ComboBox

answered on 08 Oct 2012

3 answers

156 views

Column Name from a QueryableCollectionView

Maybe a simple question, how do I get a column name from a QueryableCollectionView?
Best regards

GridView

answered on 08 Oct 2012

2 answers

249 views

Change default theme's orange to blue

Hi,

I try to change the grid's default office_black theme's orange/yellow shades to blue shades but I'm pretty stuck, specially with the column header and scrollbar. I tried following the description from article but no chance... Could you please help me out with an example (using latest version and blend4)?

Thank you,
joe

GridView

answered on 07 Oct 2012

4 answers

106 views

Page_Loaded event seems to be the wrong place to put in code for doing calculations using controls on the page

I've got 2 controls on a page, one for a request date and another for the date of birth of a client. Both of these values come from a SQL Server database. During the Page_Loaded event I had been trying to calculate the age of the client on the request date, however that's not working. For some reason, which I don't understand, the date of birth of the client is wrong (it turns out to be today's date), during the Page_Loaded event. However, once the page is actually displayed, it is correct. I had thought Page_Loaded would have been the correct event to put this code, but that doesn't seem to be the case.

So, where should I put the age calculation code? In what event?

The XAML for the first control is:

<telerik:RadMaskedDateTimeInput Name="radReqDate" MinWidth="80" TabIndex="0" FontWeight="Bold"

Value="{Binding RequestDate}" InputBehavior="Replace" TextMode="PlainText"

SelectionOnFocus="SelectAll" ValueChanged="radReqDate_ValueChanged" />

and the XAML for the second control is here:

<telerik:RadMaskedDateTimeInput Name="radDOB" EmptyContent="Enter DOB" MinWidth="80" TabIndex="14"

FontWeight="Bold" InputBehavior="Replace" TextMode="PlainText"

Value="{Binding Path=DateOfBirth, Mode=TwoWay}" ValueChanged="radDOB_ValueChanged" />

MaskedInput (Numeric, DateTime, Text, Currency)

answered on 05 Oct 2012