Questions on UI for WPF Forum

2 answers

172 views

[Solved] "Object does not match target type" error while editing radtreelistview

Hi,
I'm trying to display two datatypes in a RadTreeListView through XML. The first datatype, 'Director', with two properties: 'Name', and a property 'Function' . Function contains two properties i.e Name and FunctionType.

--------------------------------------------------------------------------------------------------

public

class Director

{

public string Name{ get; set; }

public ObservableCollection<Function > Function { get; set; }

}

public class Function

{

public string Name { get; set; }

public string FunctionType{ get; set; }

}




 

 

 

<Window.Resources>
 

 

 

<local:RadTreeListXmlDataSource x:Key="TreeSource" Source="TestData.xml" /> 
 
 
 

 

 

</Window.Resources>

 

 

 
 
 
 

 

 

  <telerik:RadTreeListView CellEditEnded="RadTreeListView1_CellEditEnded" x:Name="RadTreeListView1" RowIsExpandedChanged="RadTreeListView1_RowIsExpandedChanged" 
 
 
 

 

  AutoGenerateColumns="False" ItemsSource="{StaticResource TreeSource}"> 
 


 

 

 

  <telerik:RadTreeListView.ChildTableDefinitions> 
 


 

 

 

  <telerik:TreeListViewTableDefinition ItemsSource="{Binding Items}" /> 
 


 

 

 

  </telerik:RadTreeListView.ChildTableDefinitions> 
 


 

 

 

  <telerik:RadTreeListView.Columns> 
 


 

 

 

  <telerik:GridViewDataColumn DataMemberBinding="{Binding Name}" Header="Name" /> 
 


 

 

 

  <telerik:GridViewDataColumn DataMemberBinding="{Binding Source}" Header="Type" /> 
 


  

 

</telerik:RadTreeListView.Columns> 
 


 

 

 

</telerik:RadTreeListView> 
 







-------------------------------------------------------------------------------------------------



I was able to edit the Director's properties but when I tried to edit Function's properties i.e Funnction Name , 

I got an error saying "Object does not match target type". 

Can you please provide a sample for the above functionality?

TreeListView

answered on 22 Mar 2011

2 answers

155 views

[Solved] ValuePath property?

In other products, I had a ValuePath property and Value property, which allowed me to specify
1. The property of the lookup collection to use for the identifier of the value on the data context (ValuePath)
2. The value of the item in the data context, uh, (Value)

I assume SelectedValue is the property for Value?

Is there a ValuePath property? How do I specify that StateId from a State collection bound to the radcombo is the property to use for StateId on a Address object?

Thanks,

Morgan

ComboBox

answered on 22 Mar 2011

1 answer

104 views

Is it possible to change itemtemplate from code?

I'd like to change the itemtemplate of the radcombobox depending on wheter it's opened or closed.

Is it possible? any help on how to accomplish it?

Thanks in advance.

ComboBox

answered on 21 Mar 2011

3 answers

139 views

[Solved] Modified autogenerated fields are editable even if not in edit mode.

Hi,

I have noticed, even in your example "Customize auto-generated fields" that certain fields after created are editable even when not in edit mode, an example of this is "StartingDate" in your example. I have created a RadComboBox in my application and I have noticed that indeed it is editable even when not in edit mode. Do I need to handle enabling and disabling of these controls myself?

Thanks,
Daryl

DataForm

answered on 21 Mar 2011

3 answers

216 views

Sorting event not called if source is gridview itself

Hello everyone,

we have the following use case: a RadGridView with a Details section where both, the row and the details section has editable contents. If someone changes a property (either in a cell or in a control inside the details section) we need to defer sorting actions of the rad grid view in order to prevent the current item to be sorted "out of scope". This happens if you have a lot of items, sort by property 1 ascending, then change the value of "A" to "Z" (which re-sorts the current item to the end of the list).

We tried hooking up to sorting event and set the cancel flag to "false" but it is not called if you the cell is commited on focus lost. We tried also to set ActionOnLostFocus to none, but after clicking on a empty region inside the details element (i.e. not a button) the current cell is committed and the gridview re-sorts itself.

Any advise how to prevent the grid to automatically sort our current selected item out of view?

Example:

<telerik:RadGridView Sorting="Grid_Sorting" x:Name="Grid" ActionOnLostFocus="None" AutoGenerateColumns="False" RowDetailsVisibilityMode="VisibleWhenSelected">

<telerik:RadGridView.Columns>

<telerik:GridViewDataColumn IsReadOnly="False" DataMemberBinding="{Binding FormOfAddress}">

<telerik:GridViewDataColumn.CellEditTemplate>

<DataTemplate>

<ComboBox SelectedItem="{Binding FormOfAddress}" ItemsSource="{Binding AvailableFormOfAddresses}" />

</DataTemplate>

</telerik:GridViewDataColumn.CellEditTemplate>

</telerik:GridViewDataColumn>

</telerik:RadGridView.Columns>

<telerik:RadGridView.RowDetailsTemplate>

<DataTemplate>

<Border Background="Red" Width="100" Height="100">

<StackPanel>

<TextBlock Text="{Binding FormOfAddress}" />

<Button Content="Save" />

</StackPanel>

</Border>

</DataTemplate>

</telerik:RadGridView.RowDetailsTemplate>

</telerik:RadGridView>

Code behind:

private void Grid_Sorting(object sender, Telerik.Windows.Controls.GridViewSortingEventArgs e) {

Debug.WriteLine("Sorting called.");

}

The output "Sorting called" is only shown if a user sorts the column, but if the grid itself re-sorts it this text is not printed and therefore can't be canceled.

Version: RadControls for WPF Q1 2011

Thanks in advance,

Christian

GridView

answered on 21 Mar 2011

1 answer

284 views

DataTable don't display null values as 0

Hello,

I have a small problem.
As the data source of the chart I am using a DataTable because the DataSeries can be added dynamically.
Therefore it was the easiest way for me.

The DataTable has the following structure
   - Timestamp : DateTime
   - Value1 : double
   - Value2 : double

The problem is that in my case it is possible that a few rows have Value1 or Value2 = null because there was no value at this timestamp.
The chart displays this null value as 0. But for me it would be nice if it just ignores the null value

I created a small example which shows the problem:

public partial class MainWindow : Window

{

public MainWindow()

{

InitializeComponent();

var dt = new DataTable();

dt.Columns.Add("Timestamp", typeof(DateTime));

dt.Columns.Add("Value1", typeof(double));

dt.Columns.Add("Value2", typeof(double));

for (int i = 0; i < 20; i++)

{

var obj = new object[3];

obj[0] = DateTime.Now.AddHours(i);

obj[1] = i;

if (i % 2 != 0)

obj[2] = i + 1;

else

obj[2] = null;

dt.Rows.Add(obj);

}

chart.ItemsSource = dt;

SeriesMapping seriesMapping = new SeriesMapping();

seriesMapping.SeriesDefinition = new LineSeriesDefinition();

seriesMapping.ItemMappings.Add(new ItemMapping

{

DataPointMember = DataPointMember.XValue,

FieldName = "Timestamp",

FieldType = typeof(DateTime)

});

seriesMapping.ItemMappings.Add(new ItemMapping

{

DataPointMember = DataPointMember.YValue,

FieldName = "Value1",

FieldType = typeof(double)

});

chart.SeriesMappings.Add(seriesMapping);

SeriesMapping seriesMapping1 = new SeriesMapping();

seriesMapping1.SeriesDefinition = new LineSeriesDefinition();

seriesMapping1.ItemMappings.Add(new ItemMapping

{

DataPointMember = DataPointMember.XValue,

FieldName = "Timestamp",

FieldType = typeof(DateTime)

});

seriesMapping1.ItemMappings.Add(new ItemMapping

{

DataPointMember = DataPointMember.YValue,

FieldName = "Value2",

FieldType = typeof(double)

});

chart.SeriesMappings.Add(seriesMapping1);

}

When you try this you will see that the second Series looks a bit strange because it added 0 instead of ignoring the null value.

Is there a workaround for that?
How can I fix this problem?

I am using Version: 2010.3.1110.35

Kind Regards
Michael

Chart

answered on 19 Mar 2011

1 answer

77 views

WPF Q1 2011 controls cannot be properly resized

Hi,
I just have installed wpf q1 2011 trial version, and after I convert my project I noticed that horizontal alignment for some controls are not working (rad expander, border). They just don't respond to changing alignment, it is impossibly to stretch control inside some container(grid or border)...
Do You know something about this strange behavior?
Nebojsa Danilovic

General Discussions

answered on 19 Mar 2011

2 answers

267 views

[Solved] Drag and Drop multiple items between each other causes them to disappear in TreeView

Hello,

I am using version 2010.3.1314.35. I have a TreeView that binds to an ObservableCollection<>, and I am allowing dragging and dropping to move items around. Everything works great and gets updated nicely (I am implementing INotifyPropertyChanged on my objects), except for the following:

When a user selects multiple items in the TreeView and attempts to drop them in between the same selected items. The result is that the items completely disappear from view. I have attached a screen capture to show what I am referring to.

I was hoping that there is an easy way to handle this, but maybe I have to add some custom logic to my RadDragAndDropManager.DropQueryEvent (or perhaps my PreviewDragEnded event) to prevent such an occurrence? I'm trying to avoid having to check if the selected items are surrounding the target destination (which I assume is what is causing the disappearance).

Any help or direction on this would be greatly appreciated!

Cheers,
Mark

DragAndDrop

answered on 19 Mar 2011

1 answer

136 views

Track Changes

Does RichTextBox support track changes feature same as Microsoft Word does?
I need to compare previously entered text with the newly entered data and show user what has been changed since last time.

I was wonder to see that it is available on RadTextEditor on web and not on WPF. I thoght it is more easy to implement it on WPF than on web.

Thanks,
Wajihuddin

RichTextBox

answered on 18 Mar 2011

2 answers

104 views

.NET 4 WPF controls final release?

Hi,

When .NET 4 WPF going to be release?

Thanks

--Nodir

RichTextBox

answered on 18 Mar 2011