Questions on UI for WPF Forum

2 answers

210 views

Hi,

I have specific requirement. I need to implement a radgridview with a row that contains a combobox in the first column on load of the grid. I have a button at the last column of the same row. i use that button to fill the details in the row based on the item selected in the combobox. once filled the combobox should be replaced with the normal cell. and the default row should be moved to the next row to add another item.

Please help me to solve this .

regards
SKB

GridView

answered on 25 Jan 2012

0 answers

89 views

How to use CustomAggreageFunction???

Hi

I used binding DataTable to GridView...

flowing code:

DataTable table = new DataTable("Data Table");

DataColumn column;

DataRow row;

column = new DataColumn();

column.DataType = typeof(DateTime);

column.ColumnName = "Time";

column.ReadOnly = true;

column.Unique = true;

table.Columns.Add(column);

column = new DataColumn();

column.DataType = typeof(double);

column.ColumnName = "A";

column.ReadOnly = true;

column.Unique = false;

table.Columns.Add(column);

column = new DataColumn();

column.DataType = typeof(double);

column.ColumnName = "B";

column.ReadOnly = true;

column.Unique = false;

table.Columns.Add(column);

// Create three new DataRow objects and add

// them to the DataTable

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

{

row = table.NewRow();

row["Time"] = DateTime.Now.AddSeconds(i);

row["A"] = random.NextDouble() * 100;

row["B"] = random.NextDouble() * 50;

table.Rows.Add(row);

}

gridView.ItemsSource = table;

and then i used CustomAggregateFunction ..

public static class Statistics

{

public static double StdDev<TSource>(DataTable source, Func<TSource, double> selector)

{

int itemCount = source.Rows.Count();

if (itemCount > 1)

{

IEnumerable<double> values = from i in source select Convert.ToDouble(selector(i));

double sum = SumAvg(values);

return Math.Sqrt(sum / (itemCount - 1));

}

return 0;

}

private static double SumAvg(IEnumerable<double> values)

{

double average = values.Average();

double sum = 0;

foreach (double item in values)

{

sum += Math.Pow(item - average, 2);

}

return sum;

}

public class StandardDeviationFunction : EnumerableSelectorAggregateFunction

{

protected override string AggregateMethodName

{

get

{

return "StdDev";

}

protected override Type ExtensionMethodsType

{

get

{

return typeof(Statistics);

}

but this function occur exception :
{"No generic method 'StdDev' on type 'NS.Client.Models.Controls.Statistics' is compatible with the supplied type arguments and arguments. No type arguments should be provided if the method is non-generic. "}

what's wrong??

GridView

asked on 25 Jan 2012

3 answers

137 views

Adding RadPanelBarItem from code behind

Hi,

How do i add RadPanelBarItem from codebehind?

regards,
SKB

PanelBar

answered on 24 Jan 2012

0 answers

178 views

Questions about new records and MVVM

I have a Telerik GridView that I am using in MVVM mode. That is, I've not implemented event handlers in the code-behind, rather I've bound it to an ObservableCollection. And I have two problems.

When I click on the "Click here to add new item" bar in the grid, the CollectionChanged event on the collection fires, with it's Action set to NotifyCollectionChangedAction.Add. Which is what I would expect to happen. Then after the handler returns, the new blank row appears at the top of the grid.

The first problem: it's the second cell that is selected, and actively editable, not the first.

How do I configure the editor to have the first cell selected? It clearly can't be in the ViewModel - the observable collection doesn't have access to the grid - and shouldn't. Is there something I can add to the XAML that would control which field is active, when editing?

(One thing that might be relevant - the first cell is only editable when adding a new record, it's read-only when editing an existing record. The GridViewDataColumn has its IsReadOnlyBinding property bound to a property in the viewmodel that is true when editing an existing record. So when editing an existing row, I want to start editing with the second cell, when adding a new a new row I want to start editing with the first.)

The second problem: updating the data.

The rows in the grid are bound to elements in the collection, and those elements implement INotifyPropertyChanged. So when I am editing a record in the grid, after I leave each file, the propertyChanged event fires on the element. In that, I can update the underlying data store - except that I don't want to. I don't want to insert or update the record, after every field is changed, I want to do one insert or update when the row is complete.

But I can't figure out what event would indicate that editing of the row is complete. PropertyChanged is fired on the element as every field is changed, it doesn't tell me when the user is done editing a row. And Collection changed is fired when a new element is added to the collection, it doesn't fire to tell me that one of the elements has changed.

So, how do folks usually handle this?

== addendum ==
For what it's worth, I've tried adding an AddingNewDataItem handler:

void customerAttributesGrid_AddingNewDataItem(object sender,

telerik.Windows.Controls.GridView.GridViewAddingNewEventArgs e)

{

var grid = e.OwnerGridViewItemsControl;

grid.CurrentColumn = grid.Columns[0];

}

It's not helped. The event fires, I can walk through the handler in the debugger, setting CurrentColumn as suggested, then the CollectionChanged event fires and I walk through that. But when I'm done, the second column is still current.

GridView

asked on 24 Jan 2012

1 answer

170 views

Changing tabitem style

Hi,

I'm in WPF and I would like to know if it's possible to change the style of my RadTabItems to have a style like this the enclosed pictiure. Of course, the colors of my Telerik theme need to be maintain.

Thank's

TabControl

answered on 24 Jan 2012

3 answers

145 views

Radgridview record source replace.

I have a Radgrid and Datapager which is bound as the code below, the item source is a linq to sql class, the class is queried and the results are converted into a pivot table and both the pager and grid’s source properties are set and the grid has Aggregate Results and sort descriptors added this works well. I have a refresh button on the page but I can’t work out how to clear the pager and grid when the user clicks the button. I have tried your sample code but get errors. Could you please advise on the correct method.

<telerik:RadGridView x:Name="AgedJobsListgrid" ShowGroupPanel="False" telerik:StyleManager.Theme="Office_Black" ShowColumnFooters="True" IsScrolling="False" IsTabStop="False" RowIndicatorVisibility="Collapsed" VerticalAlignment="Stretch" DataContext="{Binding ElementName=radDataPager}" RowHeight="35" FontSize="14"></telerik:RadGridView>

<telerik:RadDataPager x:Name="radDataPager" telerik:StyleManager.Theme="Office_Black"

PageSize="10"

DisplayMode="All"

IsTotalItemCountFixed="True" Source="{Binding AgedListClass}" DataContext="{Binding ElementName=AgedJobsListgrid}" />

‘code used to clear the pager and grid which fails when setting the itemsource to nothing.

radDataPager.Source = Nothing

AgedJobsListgrid.GroupDescriptors.Clear()

AgedJobsListgrid.ItemsSource = Nothing

AgedJobsListgrid.Columns.Clear()

AgedJobsListgrid.AutoGenerateColumns = True

GridView

answered on 24 Jan 2012

2 answers

124 views

Docking within tabs

I have created a UserControl which consists of the RadDocking control. Within this I place the RadPaneGroups and subsequent RadPanes. Each RadPane contains a View, to which a ViewModel is created. The problem occurs when I place the upper most UserControl, with the RadDocking, in a tab. The tabs are dynamically created very similar to your expample with RadTab. Each time I switch tabs I see the Views being reinstantiated and in turn the ViewModel and Model. When I remove the upper most UserControl, with the RadDocking control, this does not occur. What is best practice of placing the RadDocking control within tabs without encountering this behavior?

Thank you

Docking

answered on 24 Jan 2012

3 answers

117 views

How to achieve Custom RadGridView with Transparent Header & Body

Hi,
I'm working in a Wpf application which requires the transparent header & body area. I tried using different themes available with the telerik control, i'm not able to achieve the desired result. If i set "Transparent" to the rowstyle, the default theme style comes up, but if i use any color it works fine. I have attached the sample of my required grid. Please help me to achieve the desired style. Also let me know how to disable or configure the mouseover effect for the Rows.

Thanks
Selva

GridView

answered on 24 Jan 2012

5 answers

598 views

DoubleClick on row doesn't work

Hi,

I have following markup for my RadGridView:

<telerik:RadGridView

ItemsSource="{Binding PagedSource, ElementName=radDataPager}"

SelectedItem="{Binding Path=SelectedAccount, Mode=TwoWay}"

IsBusy="{Binding IsSearchActive}"

IsReadOnly="True"

CanUserDeleteRows="False"

CanUserInsertRows="False"

ShowGroupPanel="False"

AutoGenerateColumns="False">

<telerik:RadGridView.Columns>

<telerik:GridViewDataColumn DataMemberBinding="{Binding AccountNumber}" Header="Account #" />

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

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

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

</telerik:RadGridView.Columns>

<telerik:RadGridView.InputBindings>

<MouseBinding Gesture="LeftDoubleClick" Command="{Binding DisplayViewCommand}" />

<KeyBinding Key="Enter" Command="{Binding DisplayViewCommand}" />

</telerik:RadGridView.InputBindings>

<telerik:RadGridView.RowStyle>

<Style>

</Style>

</telerik:RadGridView.RowStyle>

</telerik:RadGridView>

Now, when I hit "Enter" key the DisplayViewCommand is invoked in my ViewModel as expected.
But the DoubleClick doesn't work for some reason. (BTW: if I am double click on the Grid Header (the empty cell in top right corner) the command is triggered but of course I expect that current row double click should work also)

What I am doing wrong?

GridView

answered on 24 Jan 2012

1 answer

108 views

Zoom Rectangle co-ordinates

How co-ordinates of zoom rectangle can be captured for RadChart ?

Chart

answered on 24 Jan 2012