Questions on UI for WPF Forum

3 answers

354 views

I seem to be having some issues with a TreeListView placed inside a Grid with a single Row with Height="*" (as indicated here http://docs.telerik.com/devtools/wpf/controls/radgridview/troubleshooting/performance), with some severe performance issues when scrolling either vertically or horizontally: TreeListCellsPanel.MeasureOverride seems to be a bottleneck, and placing a breakpoint at this method indicates that this function is called successively with availableSize equals to either {0; 26} or {+Inf, +Inf}. Adding more rows or columns makes this even worse.

TreeListView

answered on 21 Dec 2016

0 answers

109 views

RadGridView scrollbar speed adjustment

Hi,

I could not find out how to adjust speed options of RadGridView scrollbar. Actual behaviour is that the more is scrollbar moved by mouse the speed is increased. Grid is showing complex data so scrolling with higher speeds in combination with more rows leads to scroll tearing. The more is speed the tearing is worse.

One solution is to set scrolling to be deffered, another one is to optimize columns, data bindings etc. and try result but I would like also to know how to fix speed at some pages a time or something like that.

Thank you very much.

GridView

asked on 21 Dec 2016

1 answer

67 views

Detect moved shape from container to diagram

If I move a shape from diagram to a container, i can attach the OnCollectionChanged() in the container to detect the moved shape. But, if I move the shap back to diagram, i dont have method to attach the change event in the diagram control. because the shape is already added in the graphsource, so the AddItem() method isnt invoked.

How can i detect a shape that is moved from container to diagram?

Thanks for a replay!

Diagram

answered on 21 Dec 2016

0 answers

116 views

Telerik Demo

I want to do something like this

General Discussions

asked on 20 Dec 2016

2 answers

96 views

how to automatically expand rowdetails on newly inserted row

The title says it all, I have a readonly gridview. In response to a button click I fire off a command in my vm to insert a new record in the bound collection. At the time this happens I need to expand the row details dataform so they can enter in the desired info. How to expand the rowdetails in this case from my viewmodel?

Thanks ... Ed

GridView

answered on 19 Dec 2016

1 answer

210 views

OverflowException on GridView Aggregate Sum

Hi team,

One of my users in production had an Exception today in a GridView with Aggregate function Sum.

I don't know how to reproduce it, even with his data I wasn't able to do it (none of the possible aggregations would overflow).

I use Telerik for WPF version 2015.2.728.40.

Is this a known bug for you?

Here is the stacktrace:

System.OverflowException: Arithmetic operation resulted in an overflow.

at System.Linq.Enumerable.Sum(IEnumerable`1 source)

at lambda_method(Closure , IGrouping`2 )

at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()

at Telerik.Windows.Data.QueryableExtensions.Aggregate(IQueryable source, IEnumerable`1 aggregateFunctions)

at Telerik.Windows.Controls.GridView.GridViewDataControl.CreateAggregateResults()

at Telerik.Windows.Controls.GridView.GridViewDataControl.OnItemsCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)

at Telerik.Windows.Controls.DataControl.OnItemsCollectionChangedDispatch(Object sender, NotifyCollectionChangedEventArgs e)

at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)

at Telerik.Windows.Data.DataItemCollection.OnCollectionChanged(NotifyCollectionChangedEventArgs e)

at Telerik.Windows.Data.DataItemCollection.OnCollectionViewCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)

at Telerik.Windows.Data.Listener`2.ReceiveWeakEvent(Object sender, TArgs args)

at Telerik.Windows.Data.WeakEvent.WeakListener`1.Handler(Object sender, TArgs args)

at Telerik.Windows.Data.QueryableCollectionView.OnCollectionChanged(NotifyCollectionChangedEventArgs args)

at Telerik.Windows.Data.QueryableCollectionView.RefreshOverride()

at Telerik.Windows.Data.QueryableCollectionView.RefreshOrDefer()

at Telerik.Windows.Data.QueryableCollectionView.InvalidatePagingAndRefresh()

at Telerik.Windows.Data.QueryableCollectionView.OnSortDescriptorsCollectionChanged(Object sender, NotifyCollectionChangedEventArgs e)

at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)

at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)

at Telerik.Windows.Data.RadObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)

at Telerik.Windows.Data.ObservableItemCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)

at Telerik.Windows.Data.RadObservableCollection`1.RaiseCollectionChangedOnResume()

at Telerik.Windows.Data.RadObservableCollection`1.ResumeNotifications()

at Telerik.Windows.Data.CollectionHelper.Reset(IEnumerable source, IList target, Func`2 itemConverter)

at Telerik.Windows.Data.ObservableCollectionManager.HandleCollectionChanged(IList sender, NotifyCollectionChangedEventArgs args)

at Telerik.Windows.Data.ObservableCollectionManager.Telerik.Windows.Data.IWeakEventListener<System.Collections.Specialized.NotifyCollectionChangedEventArgs>.ReceiveWeakEvent(Object sender, NotifyCollectionChangedEventArgs args)

at Telerik.Windows.Data.WeakEvent.WeakListener`1.Handler(Object sender, TArgs args)

at System.Collections.Specialized.NotifyCollectionChangedEventHandler.Invoke(Object sender, NotifyCollectionChangedEventArgs e)

at System.Collections.ObjectModel.ObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)

at Telerik.Windows.Data.RadObservableCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)

at Telerik.Windows.Data.ObservableItemCollection`1.OnCollectionChanged(NotifyCollectionChangedEventArgs e)

at Telerik.Windows.Data.RadObservableCollection`1.RaiseCollectionChangedOnResume()

at Telerik.Windows.Data.RadObservableCollection`1.ResumeNotifications()

at Telerik.Windows.Controls.GridView.GridViewDataControl.PerformSorting(GridViewSortingEventArgs sortingArgs)

at Telerik.Windows.Controls.GridView.GridViewDataControl.<>c__DisplayClass97.<Sort>b__96()

at Telerik.Windows.Controls.CursorManager.PerformTimeConsumingOperation(FrameworkElement frameworkElement, Action action)

at Telerik.Windows.Controls.GridView.GridViewDataControl.Sort(GridViewColumn column, Boolean appendToExisting)

at Telerik.Windows.Controls.GridView.GridViewHeaderCell.RequestSort(Boolean appendToExisting)

at Telerik.Windows.Controls.GridView.GridViewHeaderCell.PerformUserSort()

at Telerik.Windows.Controls.GridView.GridViewHeaderCell.OnMouseLeftButtonUp(MouseButtonEventArgs e)

at System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e)

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

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

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

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

at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)

at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, Object args, Int32 numArgs, Delegate catchHandler)

Thanks a lot,

Letícia Tiveron

GridView

answered on 19 Dec 2016

13 answers

169 views

Prepared Editor Event Doesn't Fire

In my last post (http://www.telerik.com/forums/missing-eventargs-type) I couldn't get this event to fire without error. After upgrading to version 2016.3.1024.45, I can't get it to fire at all. Using the sample solution Validation_WPF, I just added a handler for the event; no joy. I'm don't know whether you must have a custom property editor, but I do have one in my real solution, still no joy there.

PropertyGrid

answered on 19 Dec 2016

7 answers

1.8K+ views

Setting Focus

I'm trying to set a RadMaskedTextInput as the initially focused element by using FocusManager.FocusedElement. However this is proving problematic as it is focusing the element but not putting focus into the editable area (If I press tab I get the result that I want). This issue can be reproduced with the following code:

<StackPanel FocusManager.FocusedElement="{Binding ElementName=RadMaskedTextInput}">

<TextBox x:Name="NonTelerikTextBox"></TextBox>

<telerik:RadMaskedTextInput x:Name="RadMaskedTextInput"/>

</StackPanel>

It works fine for the TextBox, but not for the RadMaskedTextInput. I'd resort to sending a tab key press, but SendKeys isn't available in WPF and I don't want to PInvoking.

Any suggestions to get this working?

MaskedInput (Numeric, DateTime, Text, Currency)

answered on 19 Dec 2016

3 answers

109 views

Put Column in Editmode from initialise.

Hi,

Is it possible for a DataViewComboBoxColumn to display its Edit Display (what you get if you double click in the cell) - so that the combobox is showing all the time. For me, I don't feel like its clear enough to the end-user that this column is editable, and asking them to click once / double click in the cell just to display the combobox is too much.

Same goes with the CheckboxColumn - even when I set the IsReadOnly mode to False on this column - the checkbox appears to look the same as if I set it to true. The user has to go into Edit mode by clicking to determine this for themselves and I don't really want any click behaviour - seems bizarre to me that this is the default behaviour for these type of columns.

GridView