Questions on UI for WPF Forum

5 answers

193 views

AppointmentSelectionChanged : how to touch?

After some hours of "try & error" without success, I'd like to ask here ...

How can I enable the AppointmentSelectionChanged event for touched Appointment objects?

When these Appointment objects are selected by using the mouse, it's working fine.

But trying to do the same with touch input fails.

In general, touch input can be used in ScheduleView, for instance by doing double clicks with touch on Appointment objects.

But unfortunately, the single "click" with touch fails ...

Are there any ideas to fix it?

Thanks a lot in advance!

Hagen

ScheduleView

answered on 07 Dec 2016

3 answers

105 views

RadGridView Cell AutomationElement not giving correct Header using TableItemPattern

Hi,

We are trying to get the columnHeaderProperty using TableItemPattern on the Automationelement of cell inside RadGridView but it is giving wrong header value. It is giving the next header value. Here RawGridView have columns and rows virtualization support enabled.

Regards,

Nagasree.

GridView

answered on 07 Dec 2016

3 answers

196 views

Group footer label?

How can I insert text in a group footer's cell?

01.public MainWindow()

02.{

03. InitializeComponent();

04.

05. var style = new Style();

06. style.Setters.Add(new Setter(GroupHeaderRow.ShowGroupHeaderColumnAggregatesProperty, false));

07. style.Setters.Add(new Setter(GroupHeaderRow.ShowHeaderAggregatesProperty, false));

08. var radGrid = new RadGridView { GroupRenderMode = GroupRenderMode.Flat, GroupRowStyle = style};

09. Content = radGrid;

10.

11. // Table schema

12. var data = new DataTable();

13. var user = data.Columns.Add("User");

14. var cat = data.Columns.Add("Category");

15. var amt = data.Columns.Add("Amount", typeof(decimal));

16.

17. // Populate values

18. var catValues = new[] {"Cat A", "Cat B", "Cat C"};

19. for (var i = 0; i < 20; i++)

20. { data.Rows.Add("User " + i, catValues[i % catValues.Length], i * 100d); }

21.

22. // Prepare RadGridView

23. radGrid.ItemsSource = data;

24. radGrid.AutoExpandGroups = true;

25. radGrid.ShowColumnFooters = true;

26. radGrid.AutoGenerateColumns = false;

27.

28. // Build RadGrid columns

29. var gridColumns = new[] {user, cat, amt}

30. .Select(dataColumn => new GridViewDataColumn

31. {

32. UniqueName = dataColumn.ColumnName,

33. DataMemberBinding = new Binding(dataColumn.ColumnName),

34. })

35. .ToList();

36. radGrid.Columns.AddRange(gridColumns);

37.

38. // Sum Amount

39. var amtCol = gridColumns.Last();

40. var amtFormat = "{0:C}";

41. amtCol.DataFormatString = amtFormat;

42. amtCol.AggregateFunctions.Add(new SumFunction()

43. {

44. SourceField = amt.ColumnName,

45. SourceFieldType = amt.DataType,

46. ResultFormatString = amtFormat

47. });

48. radGrid.ShowGroupFooters = true;

49.

50. // Group by category

51. var catGroup = new GroupDescriptor { Member = cat.ColumnName, };

52. radGrid.GroupDescriptors.Add(catGroup);

53.

54. // Show grand total label

55. radGrid.Columns[0].Footer = "Grand Total";

56.

57. // todo: How to show group subtotal label?

58.

59.}

GridView

answered on 07 Dec 2016

2 answers

336 views

.Net 4.0 files in WPF 45 Directory

Hello,

I recently installed UI for WPF R3 2016 and today I was updated our project references to use the new version when I noticed a problem.

Several of the .dlls in the WPF45 directory, which should be for assemblies built for .Net 4.5, are actually the version for .Net 4.0.

If you look at the attached image, it's just a screenshot of Windows explorer open to C:\Program Files (x86)\Telerik\UI for WPF R3 2016\Binaries\WPF45. I am showing the file version in the list and there are 10 .dlls that show version number 2016.3.1021.40, when it should be 2016.3.1024.45.

I think an updated installer needs to be posted for this release.

Thanks,

Peter

Installer and Visual Studio Extensions

answered on 06 Dec 2016

3 answers

231 views

Scroll slowly in GridView

Hi,

I found it is hard to drag scroll bar from side to side even column virtualization is enable.

Could you give us some advice how to fix this issue?

My Grid has more than 30 columns and about 300 rows.

please reply it.

Spreadsheet

answered on 06 Dec 2016

1 answer

280 views

async / await inside row validating event

I use the gridview's row validating event to perform some validations.

All database methods in my persistence framework are defined async. The validation method needs database access, so it's also defined as async and returns a Task<bool>.

The row validating event handler awaits this validation method. If the validation fails, the isValid property is set to false.

Everything works fine as long as there is no asynchronous database call and the code execution runs synchronously. As soon as I have real asynchronism, the grid view doesn't wait for the completion of the validating event handler anymore. It continues its internal validation and the RowEditEnded event raises - although the RowValidating event handler hasn't finished already.

How can I force the grid view to wait for the asynchronous validation? I know that there are some issues with events and the async/await pattern and I tried different declaration types - without success.

Thanks for you help!

GridView

answered on 06 Dec 2016

1 answer

160 views

how to disable expanding detail rows when current row invalid

Ok, so I have gridview with IsReadOnly = True. I allow the user to expand the rowdetails and edit data using a raddataform. This the bound object for this form has dataannotations which are used to validate the record. Suppose I have a required field that is left blank. The form recognizes the problem and disables the save button, but I'm still allowed to navigate to another row. How to prevent this (mvvm style ... of course!)?

Thanks ... Ed

GridView

answered on 06 Dec 2016

3 answers

214 views

RadMenu MVVM style/template selectors

I have been looking through the Telerik RadMenu WPF demos and found the Customization_MVVM_WPF demo.I have a couple of questions with regard to this demo that I hope someone can help me with.

Question:
The MVVM demo has a class "MenuItemContainerTemplateSelector" that does not appear to be used by the demo. I can see that the 'MenuItemStyleSelector' class is used, but am curious when to use the MenuItemContainerTemplateSelector as opposed to the MenuItemStyleSelector? Is there a demo where this MenuItemCoontainerTemplateSelector class is used which I can take a look at the implementation?

What I am trying to accomplish:

I need to create a RadMenu which dynamically binds to a collection of ViewModels (RadMenuItems) and uses DataTemplates or styles to tell 'how' to display each of the ViewModels. Are there examples demonstrating this which I have not yet found? The Customization_MVVM_WPF demo somewhat covers this, but attempting to move the MenuItemsSource in this demo out of the XAML and into a collection of ViewModels which the RadMenu binds to seems to not work.

Menu

answered on 06 Dec 2016

2 answers

345 views

Bind Row number to current item

Hello,

I am using this example to get a row number in my gridview:
http://www.telerik.com/forums/how-to-display-the-row-number

I altered the code from the example and added a dependency property to it, which I am binding to a property of an item from the itemssource collection of the gridview.

public class RowNumberPresenter : TextBlock

{

private GridViewDataControl _parentControl;

public GridViewDataControl ParentControl

{

get { return this._parentControl; }

private set

{

if (this._parentControl != null)

this._parentControl.Items.CollectionChanged -= new NotifyCollectionChangedEventHandler(Items_CollectionChanged);

this._parentControl = value;

if (this._parentControl != null)

this._parentControl.Items.CollectionChanged += new NotifyCollectionChangedEventHandler(Items_CollectionChanged);

}

public RowNumberPresenter(GridViewDataControl parentControl, object dataItem)

: base()

{

ParentControl = parentControl;

SetText(dataItem);

}

private void Items_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)

{

SetText(this.DataContext);

}

private void SetText(object dataItem)

{

if (this.ParentControl.IsGrouping)

{

var group = this.ParentControl.FindGroupByItem(dataItem);

if (group != null)

{

var items = group.Items as ReadOnlyObservableCollection<object>;

if (items != null)

this.Text = (items.IndexOf(dataItem) + 1).ToString();

}

if (string.IsNullOrWhiteSpace(this.Text))

this.Text = (this.ParentControl.Items.IndexOf(dataItem) + 1).ToString();

}

public class RowNumberGridViewColum : GridViewColumn

{

private RowNumberPresenter _rowNumberPresenter;

public override FrameworkElement CreateCellElement(GridViewCell cell, object dataItem)

{

_rowNumberPresenter = cell.Content as RowNumberPresenter;

if (_rowNumberPresenter == null)

_rowNumberPresenter = new RowNumberPresenter(this.DataControl, dataItem);

CurrentIndex = Int32.Parse(_rowNumberPresenter.Text);

return _rowNumberPresenter;

}

public int CurrentIndex

{

get { return (int)GetValue(CurrentIndexProperty); }

set { SetValue(CurrentIndexProperty, value); }

}

public static readonly DependencyProperty CurrentIndexProperty =

DependencyProperty.Register("CurrentIndex", typeof(int), typeof(RowNumberGridViewColum));

}

<cControlsTelerik:RowNumberGridViewColum

IsReadOnly="True"

TabStopMode="Skip"

TextAlignment="Center"

CurrentIndex="{Binding Path=OrderRowData.SequenceNumber}">

<cControlsTelerik:RowNumberGridViewColum.Header>

<TextBlock Text="No.:"/>

</cControlsTelerik:RowNumberGridViewColum.Header>

</cControlsTelerik:RowNumberGridViewColum>

The binding is not working and I am I am a little stuck how to bind the rownumber of the row to my dataobject (a OrderRow object).
I receive the error that OrderRowData is not a property of OrderViewModel, OrderViewModel is my VM for the whole view?

The Itemssource of the gridview is set to a Rows property on my OrderViewModel, this Rows collection contains all the OrderRowData instances visible in the grid.

Any help would be appreciated.

Regards,

Marcel

GridView

answered on 06 Dec 2016

5 answers

291 views

Tab key navigation in radgridview with scroll

Lets say, i have 70 records, and currently in view is 18 records. Now, I am pressing tab for 19th time then scroll down to display 19th record. Scroll according to tab key navigation.
Please see attachment

GridView

answered on 06 Dec 2016