Hi,

Hello, how do I change the image for a WPF Radbutton for onClick or other events like onHover etc?

Thanks

I have a grid view containing several hundred rows, each of which will need to contain an image referenced via a URL. These images will come from a remote server via http.

Using an imagecolumn, with the image source bound to my arraylist containing the URL, the grid does not display until all images are downloaded, which takes some time and causes the UI thread to be unresponsive. I need to add the images asynchronously so that the rest of the row data is visible but the images appear one by one as they are downloaded (as a standard web page would).

How can I best achieve this?

Many thanks.

Hi,

I use a RadTimePicker as a CellEditTemplate in a RadGridView with binding a DataTable.
I managed to bind the data to the TimePicker and it displays correctly (e.g. 12:23:59), but I can change its value only to timestamps in hour (e.g. 12:00:00). How can I change its value to such a date as 23:34:56?

Thanks in advance!

Feri

Hi,

I am using Telerik Controls for WPF Q3 2009 (2009.3.1314.35), .NET 3.5 SP1, Windows XP SP2. I have two problems.

(1)
I have a grid bound to a (strongly typed) DataTable which has two dependent columns (in my project they're bound to the same data but display it differently). My goal is to have one column update when another changes, meaning on CellEditEnded (preferably) or RowEditEned.

For example:
<telerik:RadGridView Name="RadGridView" AutoGenerateColumns="False">
    <telerik:RadGridView.Columns>
        <telerik:GridViewDataColumn DataMemberBinding="{Binding Product_Name}" Header="Product Name"/>
        <telerik:GridViewDataColumn DataMemberBinding="{Binding Product_Name}" Header="Product Name Again"/>
    </telerik:RadGridView.Columns>
</telerik:RadGridView>

I want "Product Name Again" to refresh after "Product Name" is edited.

Searching through the forums and experimenting, I couldn't find a solution that completely works.
I should note that the same situation, but when binding to an ObservableCollection of CLR objects, works with no problem.

I tried the following:

When binding to DataTable.DefaultView, the dependent column is affected when UPDATING an existing row, but not when INSERTING a new row.
When inserting, the dependent column refreshes only after entering edit mode again and committing.

When binding directly to DataTable, updating works, but when inserting the new row visually disappears when the editing is finished. I implemented AddingNewDataItem and RowEditEnded to enable inserting.

I did something like this (assuming null is valid for all columns of the products table):
        private void RadGridView_AddingNewDataItem(object sender, Telerik.Windows.Controls.GridView.GridViewAddingNewEventArgs e)
        {
            // _productsDataTable is a strongly typed reference to the DataTable
            var product = _productsDataTable.NewProductsRow();
            e.NewObject = product;
        }

        private void RadGridView1_RowEditEnded(object sender, Telerik.Windows.Controls.GridViewRowEditEndedEventArgs e)
        {
            if (e.EditOperationType == Telerik.Windows.Controls.GridView.GridViewEditOperationType.Insert &&
                e.EditAction == Telerik.Windows.Controls.GridView.GridViewEditAction.Commit)
            {
                _productsDataTable.AddProductsRow(e.NewData as ProductsRow);
            }
        }
       
(I also tried adding the row to the table in AddingNewDataItem instead of in RowEditEnded, but got the same result)

Do have any suggestions on what might work?

=============

(2)
I have a grid ordered by a non-visible "priority" field, with CanUserReorderColumns=False. I'm unable to make the ordering refresh when the "priority" changes.

The grid has one column that looks something like this:

Change priority
---------------
   [+] [-]
   [+] [-]
   [+] [-]

If for example, the user clicks [+] on the second row, a command is invoked on a ViewModel class which changes the "priority" values of the first and second rows, so that after reordering the rows will swap places.

A requirement is that the user will always be able to click the buttons in one step, without needing to enter edit-mode first with F2/click etc.
To achieve this, I defined the buttons in the column's CellTemplate and prevented it from ever entering edit mode.

The problem is, after clicking the buttons, the underlying data changes but the grid isn't automatically reordered (which I guess is because the grid isn't aware of any edit action). The underlying data implements INotifyPropertyChanged.

I tried triggering reordering manually, but the buttons' OnClick/OnMouseUp events fire before their commands, so it had no effect.

Thanks in advance,
Yuri

Good day!

I have a form with a stack panel of questions. Each question has a number of answers which look like a list of radiobuttons.
I make my xaml dynamically:

<StackPanel x:Name="spQuestions" Orientation="Vertical" Grid.Column="1" Grid.Row="8" Grid.ColumnSpan="3" HorizontalAlignment="Left">
</StackPanel>

foreach (QuestionDTO question in questions)
            {
                StackPanel newsp = new StackPanel();
                newsp.Orientation = Orientation.Vertical;
                TextBlock textBlock = new TextBlock();
                textBlock.Text = question.Text;
                newsp.Children.Add(textBlock);
                   RadGridView gridView = new RadGridView();
                    gridView.Name = "grAnsw" + question.Id.ToString();
                    gridView.ItemsSource = question.Answers;
                    gridView.AutoGenerateColumns = false;
                    gridView.IsReadOnly = true;
                    GridViewRadioButtonColumn col = new GridViewRadioButtonColumn();    
                    gridView.Columns.Add(col);
                    newsp.Children.Add(gridView);
                    spQuestions.Children.Add(newsp);
       }

where

public class GridViewRadioButtonColumn : GridViewDataColumn
{
        public override FrameworkElement CreateCellElement(GridViewCell cell, object dataItem)
        {
            var radioButton = cell.Content as RadioButton;
            if (radioButton == null)
            {
                radioButton = new RadioButton();
                radioButton.SetBinding(RadioButton.ContentProperty, new Binding("Text")
                {
                  Source = dataItem
                });
                cell.Content = radioButton;
            }
            return radioButton;
        }
}

In the result I have the page which I wanted, but all radio buttons look like they are in the same list. So I can check only one radiobutton on the page, but I want to check one radiobutton in one question, but there are a number of questions on the page =(
How can I make the page see that there are different lists of radiobuttons for each question?

Thank you.

Has anyone else found the level of changes to public members in each new release very frustrating?

There was mention of smart tag support being available for the wpf controls in Q2 - Not that it's a necessity , but it would be a very nice to have and was wondering if it would be featuring in Q2 or not ? I've installed the beta but don't see smart tags available on any of the controls I have tried so far.

Another question ,  the collections editor for the ribbonbar works great up until you get to adding items to a group and then the collection editor only allows you to add buttons. This has been this way for some time , again it's not really necessary to make it any different as the xaml is easy enough to add but can we expect to see the collection editor have a full range of options as the windows forms controls do ? It just really makes life alot easier having the support you guys provided for the winforms controls in the designer.

Is there some way to hide the tab headers from visibility?  In Windows Forms I use the following line of code and it works fine, but i am not clear on how to do this with the WPF tabcontrol.