Questions on UI for WPF Forum

9 answers

187 views

Fast navigation

Hi,

Pleasr help me to add a custom button to navigate after 10 pages at a strech.

Thanks,
Henry

Book

answered on 04 Jun 2013

1 answer

123 views

DataTable.RejectChanges fails with RowNotInTableException

Steps to reproduce:
1. Add to project telerik controls v2011.3.1220.40
2. Create DataView and bind to grid:

DataTable dt = new DataTable("test");

for (int i = 0; i < 10; i++)

{

dt.Columns.Add("column" + i);

}

for (int i = 0; i < 10; i++)

{

var row = dt.NewRow();

for (int j = 0; j < 10; j++)

{

row[j] = j + i;

}

dt.Rows.Add(row);

}

dt.AcceptChanges();

Items = dt.AsDataView();



<Grid>    

     <Grid.RowDefinitions>
        <RowDefinition Height="Auto" />
        <RowDefinition Height="253*" />
    </Grid.RowDefinitions>
    <Button Command="{Binding UndoAllChanges}" Content="Undo all changes" Margin="10" HorizontalAlignment="Left" Padding="5,2" />
    <telerik:RadGridView ItemsSource="{Binding Items}" CanUserInsertRows="True" ShowInsertRow="True" Grid.Row="1" />
</Grid>

3. Add Undo function:

private ICommand _undoAllChanges;

public ICommand UndoAllChanges

{

get

{

if (_undoAllChanges == null)

{

_undoAllChanges = new DelegateCommand(obj =>

{

Items.Table.RejectChanges();

OnPropertyChanged("Items");

});

}

return _undoAllChanges;

}

4. To reproduce bug need to run application, sort by column1, add new item, set cell [ newRow, column1 ] to "1", click enter and then undo button.

P.S. I can't upload zip file because it's not allowed.

GridView

answered on 04 Jun 2013

2 answers

147 views

Windows8Touch StyleSelector for ListBox not working

Hello,

I am facing issue with RadListBox control styling issue when using Windows8Touch theme. Following is the description

1- I want to use different styles for each RadListBoxItem so I am using StyleSelector , It is working fine for all other themes, but as soon as I switch my application to Windows8Touch, StylesSelector stopped working. On some drilling down I came to know that in Windows8Touch "StyleSelector.SelectStyle" is not being called.

2- Following is the code for StyleSelector

public class

LstStyleSelector:StyleSelector

    {

public Style Red { get; set

; }

public Style Blue { get; set

; }

public override Style SelectStyle(object

item, DependencyObject container)

        {

if (item != null

)

            {

if (((KeyValuePair<int, string

>)item).Key % 2 == 0)

return

Red;

else

return

Blue;

            }

else

return

Red;

        }

    }

3- Following is the XAML

<Grid

<Grid.Resources

<Style x:Key="reditem" TargetType="{x:Type telerik:RadListBoxItem}"

<Setter Property="Background" Value="Red"

/>

</Style

<Style x:Key="bluitem" TargetType="{x:Type telerik:RadListBoxItem}"

<Setter Property="Background" Value="Blue"

/>

</Style

<local:LstStyleSelector x:Key="itemContainerStyle" Blue="{StaticResource bluitem}" Red="{StaticResource reditem}"

/>

</Grid.Resources

<telerik:RadListBox x:Name="lstbx" VerticalAlignment="Center" DisplayMemberPath="Value" ItemContainerStyleSelector="{StaticResource itemContainerStyle}"

/>

</Grid>

4- Here I am setting theme in App.xaml.cs

private void Application_Startup(object

sender, StartupEventArgs e)

{

//StyleManager.ApplicationTheme = new Windows8TouchTheme(); //StyleSelector not working.

    StyleManager.ApplicationTheme = new Office_BlackTheme(); //StyleSelector working fine!

}

Please help me out on this issue. I am using Q1 2013.

Regards.

ListBox

answered on 04 Jun 2013

5 answers

1.5K+ views

Programatically expand a specific row's details and select a grid row inside those details

I am having a terrible time expanding grid details. I've looked through the documentation, and message boards (this seems to be a common theme), but nothing has worked so far. Here's exactly what I want:

gridView.ItemsSource = orgList;

gridView.SelectedItem = orgList[0];

//// gridView.rows[0].Expand(); // <-- Yes, I know this doesn't exist, but pretty please add it.

Forget that last line; my issue here is that setting SelectedItem doesn't do anything. Eventually I decided that something inside Telerik's code was still processing something and I split it up into a new threaded delegate:

gridView.ItemsSource = orgList;

Action a = delegate {

gridView.SelectedItem = orgList[0];

};

Thread.Sleep(100);

App.Current.Dispatcher.Invoke(a, null);

This is a terrible solution because it uses a sleep, but it does FINALLY set the row. Then I began working on expanding the row details:

gridView.RowDetailsVisibilityMode = GridViewRowDetailsVisibilityMode.Visible;

gridView.ItemsSource = orgList;

Action a = delegate {

gridView.SelectedItem = orgList[0];

gridView.UpdateLayout();

var row = gridView.ItemContainerGenerator.ContainerFromItem(gridView.SelectedItem) as GridViewRow;

if (row != null) {

row.DetailsVisibility = Visibility.Visible;

row.IsExpanded = true;

}

};

Thread.Sleep(100);

App.Current.Dispatcher.Invoke(a, null);

Finally this worked and the grid row gets expanded. Inside this grid row's details is another RadGridView. I need to select a specific item here, and scroll it into view. Here's what I am trying:

var row2 = row.ChildrenOfType<DetailsPresenter>().FirstOrDefault() as DetailsPresenter;

if (row2 != null) {

var details = row2.Content as RadGridView;

if (details != null) {

details.SelectedItem = obj2;

details.ScrollIntoView(obj2);

}

The issue above is that "details" is always null. The inner content of the grid has not yet rendered.

Can't I make Telerik render it's grid synchronously in my method so that setting the item source sets up the grid before execution in my method continues? Or so that expanding the row sets up the detail template contents before that execution continues? If not, how can I ensure that it updates the details grid before I attempt to set that row?

GridView

answered on 04 Jun 2013

1 answer

159 views

RadChart, SeriesMappingCollection MVVM binding doesn't work.

Hello
I am a newbie in WPF RadChart. Currently I am doing a project where data will be displayed in stacked bar chart. I bound SeriesMappingCollection ViewModel property to SeriesMapping xaml property but it seems works only once (when viewmodel is instantiated)
I am unable to force chart to redraw itself when SeriesMappingCollection is feed with new portion of data.

XAML:

<telerik:RadChart

x:Name="DefectChart"

Grid.Row="1"

SeriesMappings="{Binding DiagramMappings}">

</telerik:RadChart>

ViewModel:

SeriesMappingCollection _mappings;

public SeriesMappingCollection DiagramMappings

{

get

{

if (_mappings == null)

{

_mappings = new SeriesMappingCollection();

var temp = new SeriesMappingCollection();

var sm = new SeriesMapping();

sm.SeriesDefinition = new StackedBarSeriesDefinition();

sm.ItemMappings.Add(new ItemMapping("Category", DataPointMember.XCategory));

sm.ItemMappings.Add(new ItemMapping("Data", DataPointMember.YValue));

sm.ItemsSource = new List<ChartData>()

{

new ChartData("C1", 1),

new ChartData("C2", 5),

new ChartData("C3", 7)

};

temp.Add(sm);

var sm2 = new SeriesMapping();

sm2.SeriesDefinition = new StackedBarSeriesDefinition();

sm2.ItemMappings.Add(new ItemMapping("Category", DataPointMember.XCategory));

sm2.ItemMappings.Add(new ItemMapping("Data", DataPointMember.YValue));

sm2.ItemsSource = new List<ChartData>()

{

new ChartData("C1", 10),

new ChartData("C2", 7),

new ChartData("C3", 18)

};

temp.Add(sm2);

this._mappings = temp;

}

return _mappings;

}

set

{

_mappings = value;

NotifyOfPropertyChange(() => DiagramMappings);

}

in getter I am using the mocked data, and this is drawn on chart, but after update of the SeriesMappingCollection next time chart doesn't reflect any changes.

Mocked chart data (btw taken from on of your examples)

public class ChartData

{

public ChartData(string c, double d)

{

this.Category = c;

this.Data = d;

}

public string Category { get; set; }

public double Data { get; set; }

}

Thanks in advance for help.
Regards

ChartView

answered on 04 Jun 2013

1 answer

266 views

RadBarcodeQR doesn't work in code-behind

Hello, I am trying to get byte code of QR but I faced issue.
It's standard sample from telerik

var qRCode = new RadBarcodeQR();

qRCode.ErrorCorrectionLevel = QRClassLibrary.Modes.ErrorCorrectionLevel.H;

qRCode.Mode = QRClassLibrary.Modes.CodeMode.Byte;

qRCode.Version = 2;

qRCode.Text = "TestText";

const string extension = "png";

var dialog = new SaveFileDialog()

{

DefaultExt = extension,

FileName = "QRBarCode",

Filter = "Png (*.png)|*.png"

};

if (dialog.ShowDialog() == true)

{

using (var stream = dialog.OpenFile())

{

ExportExtensions.ExportToImage(qRCode, stream, new PngBitmapEncoder());

}

But I have got the next Exception

The parameter value must be greater than zero.
Parameter name: pixelWidth

   at System.Windows.Media.Imaging.RenderTargetBitmap..ctor(Int32 pixelWidth, Int32 pixelHeight, Double dpiX, Double dpiY, PixelFormat pixelFormat)
   at Telerik.Windows.Media.Imaging.ExportHelper.GetBitmapSource(FrameworkElement element, Double dpiX, Double dpiY) in c:\TB\221\WPF_Scrum\Release_WPF\Sources\Development\Core\Controls\ExportExtensions\ExportHelper.cs:line 97
   at Telerik.Windows.Media.Imaging.ExportHelper.GetElementImage(FrameworkElement element) in c:\TB\221\WPF_Scrum\Release_WPF\Sources\Development\Core\Controls\ExportExtensions\ExportHelper.cs:line 70
   at Telerik.Windows.Media.Imaging.ImageExporter.Export(FrameworkElement element, Stream stream, BitmapEncoder encoder) in c:\TB\221\WPF_Scrum\Release_WPF\Sources\Development\Core\Controls\ExportExtensions\ImageExporter.cs:line 12
   at Telerik.Windows.Media.Imaging.ExportExtensions.ExportToImage(FrameworkElement element, Stream stream, BitmapEncoder encoder) in c:\TB\221\WPF_Scrum\Release_WPF\Sources\Development\Core\Controls\ExportExtensions\ExportExtensions.cs:line 100
   at WpfApplication1.MainWindow.ButtonBase_OnClick(Object sender, RoutedEventArgs e) in c:\Users\smile\Documents\Visual Studio 2012\Projects\WpfApplication1\WpfApplication1\MainWindow.xaml.cs:line 352
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e)
   at System.Windows.Controls.Primitives.ButtonBase.OnClick()
   at System.Windows.Controls.Button.OnClick()
   at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e)
   at System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent)
   at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e)
   at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget)
   at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target)
   at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs)
   at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised)
   at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args)
   at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args)
   at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted)
   at System.Windows.Input.InputManager.ProcessStagingArea()
   at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input)
   at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport)
   at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel)
   at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.Run()
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at System.Windows.Application.Run(Window window)
   at System.Windows.Application.Run()
   at WpfApplication1.App.Main() in c:\Users\smile\Documents\Visual Studio 2012\Projects\WpfApplication1\WpfApplication1\obj\Debug\App.g.cs:line 0
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

What am I doing wrong?
I need to get the byte[] of image source (QR, BaCode and so on), could you give me sample of code what I need to do, please? (NOT LINK, I want to see a working example)
Thank You

BarCode

answered on 04 Jun 2013

1 answer

69 views

How can I get rid of the Windows Theme in the column headers

Ok, I consider myself an accomplished WPF designer, but I cannot seem to get rid of the default style in the column headers for the RadGridView. Any help would be appreciated. Please just tell me which template to override with my own styles. This shouldn't be so difficult.

GridView

answered on 03 Jun 2013

1 answer

188 views

Async Export

Hi , is there a way to export asynchronous a very big amount of data without freezing the UI?
I've to export up to 1'000'000+ rows and the program is freezed for a long time while the grid is exporting.

Thanks,
Massimo

GridView

answered on 03 Jun 2013

1 answer

225 views

How to: Check the target of Drag and Drop (OnDragCompleted)

Hi,

I have RadListBoxes and user can drag and drop stuff between them but how can I check what the drop target is when OnDragCompleted is fired?

The problem is that I want to remove data from database if user drags stuff outside the listbox but not remove data from database if user drags stuff to other listbox. I can't seem to find out which drag and drop has been done at the moment...

Now I can get the source of drag operation from sender but how can I get the target for the drop?

Drag and drop target

Br,

Kalle

DragAndDrop

answered on 03 Jun 2013

9 answers

419 views

Editing template of RadComboBox inside RadPropertyGrid

Hi,

I have a control template that needs to be applied to all of my combo boxes in my project, including those in the property grid I have. I am using the Editable and and noneditable template to get the style that I am looking for. My property grid uses items such as textboxes, checkboxes, datetimepickers, and comboboxes. Is there a way to apply the same control template to all combo boxes that appear in my propertygrid?

Thanks

PropertyGrid

answered on 03 Jun 2013