Questions on UI for WPF Forum

1 answer

289 views

Hi,

I am in need of a custom aggregate function which is required to sum certain values based on some conditions. Can anyone give sample code for writing the custom aggregate function in WPF RadGrid?

GridView

answered on 04 Jan 2010

2 answers

172 views

Changing background color alternatively according to row number.

Hi,

How can i achieve functionality of changing row background color acording to even/odd value of row number. In other words: I would like to have all even-number rows in color A and all odd-number rows in color B, starting from first row in group.

Regards,
MC.

GridView

answered on 04 Jan 2010

6 answers

174 views

StackOverflow exception with WPF Q2003 SP1

We have installed Q2003 SP1, but we are now getting StackOverflow Exception in WindowsBase.dll each time with click a RadComboBox.

All are defined as below:

    
                    <telerik:RadComboBox x:Name="InsurancePositionComboBox" IsEnabled="{Binding DataContext.IsEnabled, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}" 
        
                                       Grid.Row="4" Grid.Column="6" 
        
                                       ItemsSource="{Binding DataContext.InsurancePositionItems,RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}}" 
        
                                       DisplayMemberPath="Name" 
        
                                       SelectedValuePath="StakeholderId" 
        
                                       SelectedValue="{Binding InsurancePositionId}" 
        
                                       IsSynchronizedWithCurrentItem="True" Margin="10,0,0,0" Height="25" Width="170"> 
        
                    </telerik:RadComboBox>

Any idea ?

ComboBox

answered on 03 Jan 2010

2 answers

155 views

[Solved] Style a Row from Binding value

In MS ListView I did like this to set color/brush on a row with sertial "Category" value.

    
             <Window.Resources> 
        
                    <Style x:Key="ItemContStyle" TargetType="{x:Type ListViewItem}">  
        
                        <Style.Resources> 
        
                            <LinearGradientBrush x:Key="Brush1" StartPoint="0.5,0" EndPoint="0.5,1">  
        
                                <GradientStop Offset="0.1" Color="#AA00CC00" /> 
        
                                <GradientStop Offset="0.8" Color="#55008800" /> 
        
                            </LinearGradientBrush> 
        
                    <LinearGradientBrush x:Key="Brush2" StartPoint="0.5,0" EndPoint="0.5,1">  
        
                                <GradientStop Offset="0.1" Color="Orange" /> 
        
                                <GradientStop Offset="0.8" Color="OrangeRed" /> 
        
                            </LinearGradientBrush> 
        
                        </Style.Resources> 
        
                        <Style.Triggers> 
        
                            <DataTrigger Binding="{Binding Path=Category}" Value="1">  
        
                                <Setter Property="Background" Value="{StaticResource Brush1}" /> 
        
                                <Setter Property="Height" Value="25"/>  
        
                            </DataTrigger> 
        
                            <DataTrigger Binding="{Binding Path=Category}" Value="2">  
        
                                <Setter Property="Background" Value="{StaticResource Brush2}" /> 
        
                                <Setter Property="Height" Value="30"/>  
        
                            </DataTrigger> 
        
                        </Style.Triggers> 
        
                    </Style> 
        
                </Window.Resources>

In Listview

    
             <ListView x:Name="listView1" ItemContainerStyle="{StaticResource ItemContStyle}">  
        
            <ListView.View> 
        
            <GridView> 
        
             <GridViewColumn Header="Artist" DisplayMemberBinding="{Binding Path=Artist}" Width="310" /> 
        
            <GridViewColumn Header="Title" DisplayMemberBinding="{Binding Path=Title}" Width="310" /> 
        
            </GridView> 
        
            </ListView.View> 
        
             </ListView>

How can I applay the same method on RadGridView?

GridView

answered on 30 Dec 2009

1 answer

99 views

gridView in Wpf

Two Questions

1 how can i Control over the Place of the splitter ?

2 i want to change the header line background color to white ?

GridView

answered on 30 Dec 2009

1 answer

185 views

DataTable binding example

can't find in the latest documentation how to bind datatable to the radgridview. .itemssource works , table gets rows added , call .rebind , grid scrolls but rows are added with no values (or at least not displayed) , also how do I get scroll bars...

is this release of ddls botched? or is it me?

GridView

answered on 30 Dec 2009

3 answers

118 views

help with migrating from obscolete calls

selected_id = (

string)((DataRow)((DataRecord)this.radGridView_A1.SelectedRecord).Data)[0];

DataRecord is gone, any sugguestions, Also, don't understrand why telerik posts examples (as of 3 months ago ) of apis that will be obscolete, wtf?

GridView

answered on 30 Dec 2009

1 answer

88 views

did api change - SelectedRecords does not work

if (this.radGridView_A1.SelectedRecords.Count() == 0)

does not compile with the latest (q3) wpf dlls

GridView

answered on 30 Dec 2009

5 answers

253 views

[Solved] Drag drop within a GridWiew

I have to grid views (one is my medialibrary and one for a playlist). I want to drag songs from the "medialibrary" to the "playlist", I aslo need to be adle to insert anywhere on the "playlist" grid when I drag from "medialib".

Also need to dragdrop within the "playlist" so I can change place on the songs in the "playlist".

Now I only get drag from "medialib" to "playlist" work sort of, and the tooltip looks funny.

Help!

C#

    
            ObservableCollection<Song> _mediaLib;     
        
            ObservableCollection<Song> _playlist;     
        
            private void InitGrids()     
        
                    {     
        
                        _mediaLib = new ObservableCollection<Song>();     
        
                        _playlist = new ObservableCollection<Song>();     
        
                        radGridViewMediaLib.ItemsSource = _mediaLib;     
        
                        radGridViewPlaylist.ItemsSource = _playlist;     
        
                        RadDragAndDropManager.AddDropQueryHandler(radGridViewMediaLib, OnDropQuery);     
        
                        RadDragAndDropManager.AddDropQueryHandler(radGridViewPlaylist, OnDropQuery);     
        
                        RadDragAndDropManager.AddDragQueryHandler(radGridViewMediaLib, OnOrderDragQuery);     
        
                        RadDragAndDropManager.AddDragQueryHandler(radGridViewPlaylist, OnOrderDragQuery);     
        
                        RadDragAndDropManager.AddDragInfoHandler(radGridViewMediaLib, OnOrderDragInfo);     
        
                        RadDragAndDropManager.AddDragInfoHandler(radGridViewPlaylist, OnOrderDragInfo);     
        
                    }    
        
            #region DragDrop     
        
                    private void OnDropQuery(object sender, DragDropQueryEventArgs e)     
        
                    {     
        
                        // We allow drop only if the dragged items are products:     
        
                        ICollection draggedItems = e.Options.Payload as ICollection;     
        
                        bool result = draggedItems.Cast<object>().All((object item) => item is Song);     
        
                        e.QueryResult = result;     
        
                        e.Handled = true;     
        
                        // Note that here we agree to accept a drop. We will be notified     
        
                        // in the DropInfo event whether a drop is actually possible.     
        
                    }     
        
                    private void OnOrderDragQuery(object sender, DragDropQueryEventArgs e)     
        
                    {     
        
                        RadGridView gridView = sender as RadGridView;     
        
                        if (gridView != null)     
        
                        {     
        
                            IList selectedItems = gridView.SelectedItems.ToList();     
        
                            e.QueryResult = selectedItems.Count > 0;     
        
                            e.Options.Payload = selectedItems;     
        
                        }     
        
                        e.QueryResult = true;     
        
                        e.Handled = true;     
        
                    }     
        
                    private void OnOrderDragInfo(object sender, DragDropEventArgs e)     
        
                    {     
        
                        RadGridView gridView = sender as RadGridView;     
        
                        IEnumerable draggedItems = e.Options.Payload as IEnumerable;     
        
                        if (e.Options.Status == DragStatus.DragInProgress)     
        
                        {     
        
                            //Set up a drag cue:     
        
                            TreeViewDragCue cue = new TreeViewDragCue();     
        
                            //Here we need to choose a template for the items:     
        
                            cue.ItemTemplate = this.Resources["Song"] as DataTemplate;     
        
                            cue.ItemsSource = draggedItems;     
        
                            e.Options.DragCue = cue;     
        
                        }     
        
                        else if (e.Options.Status == DragStatus.DragComplete)     
        
                        {     
        
                            IList source = gridView.ItemsSource as IList;     
        
                            foreach (object draggedItem in draggedItems)     
        
                            {     
        
                                _playlist.Add((Song)draggedItem);     
        
                            }     
        
                        }     
        
                    }    
        
                    #endregion     
        
            private ObservableCollection<Song> GetSongs(int count)     
        
                    {     
        
                        ObservableCollection<Song> _sList = new ObservableCollection<Song>();     
        
                        for (int i = 0; i < count; i++)     
        
                        {     
        
                            Song _s = new Song();     
        
                            _s.Artist = "Artist " + i.ToString();     
        
                            _s.Title = "Title " + i.ToString();     
        
                            _s.GUID = Guid.NewGuid();     
        
                            _sList.Add(_s);     
        
                        }     
        
                        return _sList;     
        
                    }     
        
            //Song class     
        
            public class Song     
        
                {     
        
                    public Song()     
        
                    {     
        
                    }     
        
                    public Guid GUID { get; set; }     
        
                    public string Artist { get; set; }     
        
                    public string Title { get; set; }     
        
                }

WPF:

    
            <Window.Resources> 
        
                    <Style TargetType="gridViewElements:GridViewRow" x:Key="OrderItemStyle">  
        
                        <Setter Property="dragDrop:RadDragAndDropManager.AllowDrag" Value="True" /> 
        
                    </Style> 
        
                    <LinearGradientBrush x:Key="DropPossibleBackground" StartPoint="0 0" EndPoint="0 1">  
        
                        <GradientStop Offset="0" Color="White" /> 
        
                        <GradientStop Offset="1" Color="#FFE699" /> 
        
                    </LinearGradientBrush> 
        
                </Window.Resources> 
        
            <telerik:RadGridView Height="762" Margin="12,42,571,-42" Name="radGridViewMediaLib" Width="595" HorizontalAlignment="Left" 
        
                                         IsReadOnly="True" dragDrop:RadDragAndDropManager.AllowDrop="True" 
        
                                    RowStyle="{StaticResource OrderItemStyle}" Background="White" 
        
                                    CanUserFreezeColumns="False" CanUserInsertRows="False" 
        
                                    ShowGroupPanel="False" /> 
        
                    <telerik:RadGridView Height="762" Margin="0,50,64,-50" Name="radGridViewPlaylist" Width="480" HorizontalAlignment="Right"   
        
                                         IsReadOnly="True" dragDrop:RadDragAndDropManager.AllowDrop="True" 
        
                                    RowStyle="{StaticResource OrderItemStyle}" Background="White" 
        
                                    CanUserFreezeColumns="False" CanUserInsertRows="False" 
        
                                    ShowGroupPanel="False" />

DragAndDrop

answered on 30 Dec 2009

1 answer

82 views

SelectedDateTimeChanged event issue

hi
i would like to rollback the datetime user selection under the 'SelectedStartDateTimeChanged' event.
it seems that the SelectedDateTime property is updated correctly but the time control (view) is not.

scenario
the current dateTime selection is 29/12/2009 14:00
user try to change the datetime to 29/12/2009 15:00
then i would like from the time control to show 14:00 and not 15:00

source code:
private void OnSelectedStartDateTimeChanged(object sender, RoutedPropertyChangedEventArgs<DateTime?> e)
        {
            try
            {
                UnSubscribeToSelectedStartDateTimeChanged();
                if (e.OldValue == null) //first time loading
                    return;

                 startDateTime.SelectedDateTime = (DateTime) e.OldValue;

            }
            finally
            {
                SubscribeToSelectedStartDateTimeChanged();
            }
        }

TimePicker

answered on 30 Dec 2009