Questions on UI for WPF Forum

1 answer

140 views

SelectedItem Binding OneWayToSource tries to get the property value

Hi,

I have a combobox in my application that has this binding on the SelectedItem

SelectedItem="{Binding Path=Food, Mode=OneWayToSource}">

The back end property is define as follows

public Food Food

{

get { return _food; }

set { _food = value; }

}

My problem is that the above binding will try to get the property, this is not the expected behavior for this type of binding.
Can you suggest a work around you come up with fix ?

Thank you,

ComboBox

answered on 26 Jul 2010

5 answers

248 views

Quick Start Framework for WPF

Do you plan on publishing something like this that you did for WinForms? Or at least release all of the code used in the demos? I see others are asking the same thing too.

Thanks!

General Discussions

answered on 26 Jul 2010

1 answer

99 views

calendar doesn't display

Hi,

Version : 2010 Q2 - 2010.2.714.35

Hi,

I have a WPF application (.net 3.5) with MVP pattern and the Microsoft Unity container.
When i add a RadDatePicker in a view, there is a drop down problem :
the calendar doesn't appear and other controls have a similar behavior : for the original ComboBox, the drop down list don't display.
Without RadDatePicker, all controls appear correctly.
(With the version 2010.1.422.35, it work.)

I don't have this problem in a classic WPF application (without MVP neither Unity).

Otherwise, in the Visual Studio out, an error occurs many time :

System.Windows.Data Error: 4 : Cannot find source for binding with reference 'ElementName=PART_DropDownButton'. BindingExpression:Path=IsMouseOver; DataItem=null; target element is 'ButtonChrome' (Name='ButtonChrome'); target property is 'RenderMouseOver' (type 'Boolean')

I try to catch this error with a diagnostic converter (System.Diagnostics) :
<Style TargetType="{x:Type telerik:RadDatePicker}">
<Setter Property="???" Value="{Binding Path=???, RelativeSource={RelativeSource AncestorType={x:Type ItemsControl}}, diagnostics:PresentationTraceSources.TraceLevel=High}"/>
</Style>

But i don't found interesting property to watch in order to have more details.

Thanks in advance

DatePicker

answered on 26 Jul 2010

2 answers

158 views

Applying ControlTemplate to RadCarousel

Having a little problem when I try to apply a control template to the rad carousel, in that as soon as I put in the binding to the template, the carousel no longer displays any items.

Here is the code for the carousel:

<Border

ClipToBounds="True"

Grid.Column="1"

Grid.RowSpan="4"

Grid.ColumnSpan="2"

Grid.Row="0"

VerticalAlignment="Top"

Margin="0,40,10,0"

HorizontalAlignment="Right"

x:Name="carFav"

Height="70px"

Width="500px"

Visibility="Collapsed">

<telerik:RadCarousel

x:Name="Favorites"

AutoGenerateDataPresenters="False"

HorizontalScrollBarVisibility="Hidden"

VerticalContentAlignment="Bottom"

Template="{StaticResource FavouritesCarousel}">

<telerik:RadCarousel.Background>

<LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">

<GradientStop Color="#FF7D7D7D" Offset="0.164"/>

<GradientStop Color="White" Offset="0.093"/>

</LinearGradientBrush>

</telerik:RadCarousel.Background>

<telerik:RadCarousel.ReflectionSettings>

<telerik:ReflectionSettings Visibility="Visible" OffsetY="3"/>

</telerik:RadCarousel.ReflectionSettings>

</telerik:RadCarousel>

</Border>

And the control template code:

<ControlTemplate x:Key="FavouritesCarousel" TargetType="{x:Type telerik2:RadCarousel}">

<Grid>

<ScrollViewer

x:Name="CarouselContentPresenter"

CanContentScroll="True"

HorizontalAlignment="Stretch"

VerticalAlignment="Stretch"

Background="Gray"

HorizontalScrollBarVisibility=

"{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type telerik2:RadCarousel}}, Path=HorizontalScrollBarVisibility}"

VerticalScrollBarVisibility=

"{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type telerik2:RadCarousel}}, Path=VerticalScrollBarVisibility}"

>

<ItemsPresenter

x:Name="ItemsPresenter"

HorizontalAlignment="Stretch"

VerticalAlignment="Stretch"/>

</ScrollViewer>

</Grid>

</ControlTemplate>

Any suggestions? Thanks.

Carousel

answered on 26 Jul 2010

8 answers

196 views

Expanding event

Hello,
What event occures when we expand the row in hierarchical gridview?

GridView

answered on 26 Jul 2010

3 answers

85 views

ToolWindow and Windows 7 Shortcuts

Hi,

I had a quick look in the PITS but didn't notice if this issue is in there.

There seems to be an issue with floating panes and using the Windows 7 Windows Key shortcuts.

Using WindowsKey + Down Arrow, will minimise the the floating window to somewhere and also and subsequent attempts to make any other panes floating fail. Dragging a window out of the tabbed documents also immediatly makes the about to be floating window disappear.

Using WindowsKey + Right (with two monitors) will send the floating window to the right of the secondary monitor, and will only allow it to be dragged within half of the screen width on that monitor, ie, it is given half the screen width and that is all. To move it back out, WindowsKey + Left can be used.

Thanks,

Adam

Docking

answered on 26 Jul 2010

1 answer

161 views

Edit Column Footer Style

Hi,
Could any one guide me how can I edit the column footer style from Expression blend.. Actually want a single strip for agreegates, not different cells against each column. I can edit the group footer style but column footer style is note availble. For refernence, I am attaching a screen shot. THANKS

GridView

answered on 26 Jul 2010

1 answer

158 views

Adding a new item to the GridViewComboBoxColumn after setting the ItemsSource property

Hello :)

This is my scenario:

I have a gridview with a GridViewComboBoxColumn with the property isComboBoxEditable set to true and the ItemsSource property set to a List<T> (the data of this list is populated from a data base). The SelectedValueMemberPath set to a property of the T object and the DisplayMemberPath set to an another property of T. Everything works as expected.

I would like to know how can I do the following if possible:
The reason for the isComboBoxEditable is set to true is that I want the user to add new items to the GridViewComboBoxColumn, then I save this new item to the data base and then display the combobox with the new item. So how can I access the combobox and add the new item and then display the combobox list with the new item? I guess refreshing the combobox, refreshing the row, or refreshing the entire gridview could help because all the combobox in the rows created previously must have the new created item too.

I hope you can help me.

Best regards,
Jorge Alberto

GridView

answered on 26 Jul 2010

4 answers

80 views

NullRef since upgrade to Q2

Hi,

I upgraded to the Q2 release for WPF and I'm now getting intermittent NullReferenceExceptions coming from the following exception below.

This seems to be due to the fact that CoverRectangle is backed by a WeakReference.

What seems to be happening is CoverRectangle is being GCed during the drag operation. This may be due to the fact that in .NET 4 the GC is much more aggressive.

Thanks,

Kavan

Stack Trace

-----------

1) Type: NullReferenceException (System.NullReferenceException)

1) Message: Object reference not set to an instance of an object.

1) Data: YES (1 Entries Below)

1) Key: 'System.Object' Value: ''

1) ** Stack Trace:

1) at Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.PositionArrow() in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2\Sources\Development\Core\Controls\DragDrop\RadDragAndDropManager.cs:line 1573

1) at Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.OnRealDrag(IMouseEventArgs e) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2\Sources\Development\Core\Controls\DragDrop\RadDragAndDropManager.cs:line 1318

1) at Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.OnCoverRectangleMouseMove(Object sender, MouseEventArgs e) in c:\Builds\WPF_Scrum\Release_WPF_2010_Q2\Sources\Development\Core\Controls\DragDrop\RadDragAndDropManager.cs:line 856

1) at System.Windows.Input.MouseEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)

1) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)

1) at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)

1) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)

1) at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)

1) at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)

1) at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)

1) at System.Windows.Input.InputManager.ProcessStagingArea()

1) at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)

1) at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)

1) at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)

1) at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)

1) at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)

1) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)

1) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)

1) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)

1) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)

1) ** No Inner Exception

DragAndDrop

answered on 25 Jul 2010

6 answers

463 views

Stackoverflow

Hi..
When I do the following I get a stackoverflow error... What am I doing wrong? How do I set the selected item in the grid to the first row.. when 'loaded'..... thanks again

this.grid.IsBusy = true;

Load_Invoices(); // Sets ItemsSource

this.grid.IsBusy = false;

// Blows up Here!

this.grid.SelectedItem = this.grid.Items[0];

GridView

answered on 25 Jul 2010