Questions on UI for WPF Forum

1 answer

64 views

I am having an error when I combine the WPF demonstration examples labeled "Context Menu for header cells" and "Save and Load grid settings". The context menu in the header cells does not appear after you have saved the grid settings and come back to the grid.

Anyone know of an example that combines the above, two examples, successfully?

Thank you.

GridView

answered on 11 Mar 2010

1 answer

55 views

Expression Columns in RadGridView (cross posted from Beta forums)

Hi,
DevEx has a nice feature called Expression columns for their grid with expression editor. One can use the expression editor to create an expression for a column run time.
Is there anything like that available for RadGridView either in Beta or in the current release version?
thanks
Nick

GridView

answered on 11 Mar 2010

2 answers

110 views

RadGridView crashes on Return/Enter

Hi,

when hitting return/enter after editing the DateTimePicker's value (its actually enough when it gets keyboard-focus) a System.NullReferenceException is thrown.
repro-code:

    
            namespace RadGridViewFocusBug 
        
            { 
        
                /// <summary> 
        
                /// Interaction logic for Window1.xaml 
        
                /// </summary> 
        
                public partial class Window1 : Window 
        
                { 
        
                    public Window1() 
        
                    { 
        
                        InitializeComponent(); 
        
                        ObservableCollection<BusinessObject> col = new ObservableCollection<BusinessObject>(); 
        
                        col.Add(new BusinessObject() { Arrival = DateTime.Now }); 
        
                        col.Add(new BusinessObject() { Arrival = DateTime.Now }); 
        
                        col.Add(new BusinessObject() { Arrival = DateTime.Now }); 
        
                        this.DataContext = col; 
        
                    } 
        
                } 
        
                public class BusinessObject 
        
                { 
        
                    public DateTime Arrival { get; set; } 
        
                } 
        
            }

    
            <Window x:Class="RadGridViewFocusBug.Window1" 
        
                xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        
                xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        
                xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" 
        
                Title="Window1" Height="300" Width="300"> 
        
                <Grid> 
        
                    <telerik:RadGridView ItemsSource="{Binding}" AutoGenerateColumns="False"> 
        
                        <telerik:RadGridView.Columns> 
        
                            <telerik:GridViewDataColumn Header="Arrival" > 
        
                                <telerik:GridViewColumn.CellTemplate> 
        
                                    <DataTemplate> 
        
                                        <telerik:DateTimePicker SelectedDateTime="{Binding Path=Arrival, Mode=TwoWay}"/> 
        
                                    </DataTemplate> 
        
                                </telerik:GridViewColumn.CellTemplate> 
        
                            </telerik:GridViewDataColumn> 
        
                        </telerik:RadGridView.Columns> 
        
                    </telerik:RadGridView> 
        
                </Grid> 
        
            </Window>

Best Regards
Steffen

General Discussions

answered on 11 Mar 2010

1 answer

112 views

Drag from ListBox to TreeView

I've just purchased the WPF components and am very impressed with the level of functionality having previously built a project using the straight Microsoft Components . One of the important requirements for our next project is the ability to drag and drop items from a ListBox to a Treeview. Each of these components are located in separate UserControls. I have been successful in drag and dropping within the same Treeview and from the Listbox to the GridView but cannot seem to get the ListBox to Treeview working. I am sure I am missing something basic or are there any limitations in dragging from a Listbox in one UserControl to a Treeview in another .Hope you can help

DragAndDrop

answered on 11 Mar 2010

9 answers

777 views

How to change the Header Label

Hi,
how to change the label in RadGridView "Drag a Column header and drop it here to group by that colunm" ?

Thanks.
Marco

GridView

answered on 11 Mar 2010

1 answer

51 views

Telerik killed my VS 2008 install

I company I was consulting to asked me to install the Telerik controls for WPF. A consultant had purchased it for them but had not did any work with it. Not sure if this is a good copy but with the way the eval is going there is little hope that the library will stay installed for very long.

I see a posting about how to do coverflow and a zip file with source. When I copy the XAML to my window what do I see????

Error indicating that the XAML is not correct. And when I went to find the error CTL-F, well my VS 2008 install is now screwed up. No more CTL-F. No more CTL-H.

Beyond that the sample given uses BringDataItemIntoView which does not work.

Since you only get one chance to make a first impression that is gone.

General Discussions

answered on 11 Mar 2010

1 answer

102 views

WPF Themes in Q1 2010

The Silverlight Q1 2010 installer included a nice Themes project that allowed easy access to the different themes. This is great for creating custom themes using a Telerik theme as a starting point.

How can I get the themes for the WPF controls?

General Discussions

answered on 11 Mar 2010

1 answer

104 views

Drag drop preview line and tool tip display at blank space

Hi,
I am facing problem with my tree control, that i collapse the tree and dragged an item below the tree i.e. on blank part of the tree, it show the drag drop tooltip and drop preview line on the blank part of tree. It seems that items are not collapsing properly. i captured the collapse event and calling the tree item's collapseAll method but the problem still persist.
i unable to find the reason.

Thanks
Balaram Barange

TreeView

answered on 11 Mar 2010

3 answers

161 views

Object not set to an instance of an object

Hi. I placed a TileView control in my XAML page, and it compiles fine and I can see the control at design time. However, when the page loads at runtime, I get the exception follwoing exception:

Object reference not set to an instance of an object.

at Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.FindRootVisual() at Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.Initialize() at Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.OnAllowDragChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) at System.Windows.DependencyObject.OnPropertyChanged(DependencyPropertyChangedEventArgs e) at System.Windows.FrameworkElement.OnPropertyChanged(DependencyPropertyChangedEventArgs e) at System.Windows.DependencyObject.NotifyPropertyChange(DependencyPropertyChangedEventArgs args) at System.Windows.DependencyObject.UpdateEffectiveValue(EntryIndex entryIndex, DependencyProperty dp, PropertyMetadata metadata, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, Boolean coerceWithDeferredReference, OperationType operationType) at System.Windows.DependencyObject.SetValueCommon(DependencyProperty dp, Object value, PropertyMetadata metadata, Boolean coerceWithDeferredReference, OperationType operationType, Boolean isInternal) at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value) at Telerik.Windows.Controls.DragDrop.RadDragAndDropManager.SetAllowDrag(DependencyObject obj, Boolean value) at Telerik.Windows.Controls.RadTileViewItem.OnApplyTemplate() at System.Windows.FrameworkElement.ApplyTemplate() at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Canvas.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint) at System.Windows.Controls.ItemsPresenter.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Control.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV) at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint) at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Border.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Control.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Designer.SimpleViewManager.DesignerBackground.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Decorator.MeasureOverride(Size constraint) at Microsoft.Windows.Design.Interaction.DesignerView.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Designer.Viewport.MeasureOverride(Size availableSize) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint) at System.Windows.Controls.ScrollContentPresenter.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureCell(Int32 cell, Boolean forceInfinityV) at System.Windows.Controls.Grid.MeasureCellsGroup(Int32 cellsHead, Size referenceSize, Boolean ignoreDesiredSizeU, Boolean forceInfinityV) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.ScrollViewer.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Grid.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at MS.Internal.Helper.MeasureElementWithSingleChild(UIElement element, Size constraint) at System.Windows.Controls.ContentPresenter.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Controls.Control.MeasureOverride(Size constraint) at System.Windows.FrameworkElement.MeasureCore(Size availableSize) at System.Windows.UIElement.Measure(Size availableSize) at System.Windows.Interop.HwndSource.SetLayoutSize() at System.Windows.Interop.HwndSource.set_RootVisualInternal(Visual value) at System.Windows.Interop.HwndSource.set_RootVisual(Visual value) at MS.Internal.Designer.VSIsolatedDesigner.ViewHolder.Initialize() at MS.Internal.Designer.VSIsolatedDesigner.ViewHolder..ctor(UIElement content) at MS.Internal.Designer.VSIsolatedDesigner.VSIsolatedView.get_ViewHandle() at MS.Internal.Host.Isolation.IsolatedView.get_ViewHandle() at MS.Internal.Designer.DesignerPane.LoadDesignerView()

My TileView's XAML is this:

    
            <NavigationControls:RadTileView Grid.ColumnSpan="4" Name="radTileView1" Grid.Row="1" 
        
                                            Margin="5" Width="800" Height="450" MinimizedColumnWidth="150"> 
        
                <NavigationControls:RadTileViewItem> 
        
                    <NavigationControls:RadTileViewItem.Header> 
        
                        <TextBlock Text="Vehículo header"></TextBlock> 
        
                    </NavigationControls:RadTileViewItem.Header> 
        
                    <NavigationControls:RadTileViewItem.Content> 
        
                        <Controls:RadFluidContentControl AnimationControls:AnimationManager.IsAnimationEnabled="True" 
        
                                                         SmallToNormalThreshold="291,130" 
        
                                                         NormalToSmallThreshold="292,131" 
        
                                                         NormalToLargeThreshold="735,350" 
        
                                                         LargeToNormalThreshold="731,351"> 
        
                            <Controls:RadFluidContentControl.SmallContent> 
        
                                <TextBlock Text="Vehículo small"></TextBlock> 
        
                            </Controls:RadFluidContentControl.SmallContent> 
        
                            <Controls:RadFluidContentControl.Content> 
        
                                <TextBlock Text="Vehículo content"></TextBlock> 
        
                            </Controls:RadFluidContentControl.Content> 
        
                            <Controls:RadFluidContentControl.LargeContent> 
        
                                <TextBlock Text="Vehículo large"></TextBlock> 
        
                            </Controls:RadFluidContentControl.LargeContent> 
        
                        </Controls:RadFluidContentControl> 
        
                    </NavigationControls:RadTileViewItem.Content> 
        
                </NavigationControls:RadTileViewItem> 
        
                <NavigationControls:RadTileViewItem> 
        
                    <NavigationControls:RadTileViewItem.Header> 
        
                        <TextBlock Text="Empresa header"></TextBlock> 
        
                    </NavigationControls:RadTileViewItem.Header> 
        
                    <NavigationControls:RadTileViewItem.Content> 
        
                        <Controls:RadFluidContentControl AnimationControls:AnimationManager.IsAnimationEnabled="True" 
        
                                                         SmallToNormalThreshold="291,130" 
        
                                                         NormalToSmallThreshold="292,131" 
        
                                                         NormalToLargeThreshold="735,350" 
        
                                                         LargeToNormalThreshold="731,351"> 
        
                            <Controls:RadFluidContentControl.SmallContent> 
        
                                <TextBlock Text="Empresa small"></TextBlock> 
        
                            </Controls:RadFluidContentControl.SmallContent> 
        
                            <Controls:RadFluidContentControl.Content> 
        
                                <TextBlock Text="Empresa content"></TextBlock> 
        
                            </Controls:RadFluidContentControl.Content> 
        
                            <Controls:RadFluidContentControl.LargeContent> 
        
                                <TextBlock Text="Empresa large"></TextBlock> 
        
                            </Controls:RadFluidContentControl.LargeContent> 
        
                        </Controls:RadFluidContentControl> 
        
                    </NavigationControls:RadTileViewItem.Content> 
        
                </NavigationControls:RadTileViewItem> 
        
            </NavigationControls:RadTileView>

Could there be anything I'm missing? Thanks.

TileView

answered on 11 Mar 2010

1 answer

106 views

How to get underlying object... always null

I'm trying to get the underlying object that's bound to a dropped item in a drag-drop operation. In my case the underlying object is of type Model.Topic.

I use the following code:

    
            private void RadTreeView_DragEnded(object sender, Telerik.Windows.Controls.RadTreeViewDragEndedEventArgs e)  
        
                    {  
        
                        object droppedTopics = e.DraggedItems;  
        
                        object targetDropItem = e.TargetDropItem;  
        
                        Model.Topic targetTopic = targetDropItem as Model.Topic;  
        
                        foreach (object droppedTopic in e.DraggedItems as Collection<object>)  
        
                        {  
        
                            Model.Topic sourceTopic = droppedTopic as Model.Topic;  
        
                            targetTopic.ParentTopicId = sourceTopic.ID;  
        
                        }  
        
                    }

The problem is that after the following line, targetTopic is always null.

    
            Model.Topic targetTopic = targetDropItem as Model.Topic;

The question is, what is the correct way to get the underlying object that is bound to a dragged/dropped item?

TreeView

answered on 10 Mar 2010