I am getting a null reference exception whenever assigning to the RadPdfViewer FixedDocumentPresenter property. The last line of code below is where an exception is thrown. I have also tried to set the FixedDocumentPresenter property by using pdfViewer.GetRegisteredPresenter(), but I get the same exception. I need the presenter to be set so I can get coordinates of the PDF but the value is null.

            pdfViewer = new RadPdfViewer();
            string pdfFilePath = "C:\\temp\\GeneratedDocument.pdf";
            MemoryStream stream = new MemoryStream();
            using (Stream input = File.OpenRead(pdfFilePath))
            {
                input.CopyTo(stream);
            }
            FormatProviderSettings settings = new FormatProviderSettings(ReadingMode.OnDemand);
            PdfFormatProvider provider = new PdfFormatProvider(stream, settings);
            RadFixedDocument doc = provider.Import();
            pdfViewer.Document = doc;
            pdfViewer.MouseDoubleClick += PdfViewer_MouseDoubleClick;

            var myPresenter = new FixedDocumentSinglePageViewPresenter();
            pdfViewer.FixedDocumentPresenter = myPresenter;

EXCEPTION:Error Message: Object reference not set to an instance of an object.

   at Telerik.Windows.Controls.FixedDocumentViewerBase.InitializeFixedDocumentPresenter(IFixedDocumentPresenter releasedPresenter, IFixedDocumentPresenter presenter)
   at Telerik.Windows.Controls.FixedDocumentViewerBase.set_FixedDocumentPresenter(IFixedDocumentPresenter value)

Would it be possible to reorder the columns by dragging as in the GridView?

Thanks in advance,
Steve

Hi!

I have RadGridView, and I need to get Header cell for all columns. How to get header cells (not content) in RadGridView.

Thanks.

Hello,

I am new to both XAML and Telerik. I am trying to implement some functionality to an existing application that will allow me to drag and drop a tree node item to a data grid. I have been looking at the example here (https://github.com/telerik/xaml-sdk/tree/master/TreeView/DragDropTreeViewToControls) and it seems very similar to what I need except a data grid instead of a list box. It should behave in the following way:

1) Allow drag and drop of tree node items ONLY to the left column cell(s) of an adjacent data grid (the other column will be prepopulated with data)

2) DISABLE drap and drop (and reorder, etc) within the RadTreeView itself.

If possible, please attach an example solution in a zip file.

Thank you in advance.

Hello,

we've an issue with the fluent theme (and material theme also). 
As example the pin button has a wrong style. See attached screen shot.

How can we fix this problem?

Version: 2018.1.122.145.

Thanx

Markus

Hello, I was wondering if I could prevent the user from dragging the alert off screen limits, I did find IsRestricted property here https://docs.telerik.com/devtools/wpf/controls/radwindow/how-to/prevent-dragging-off-the-screen

But I could not manage to apply it to one of your predefined dialogs (Alert, Prompt, Confirm). Is there any way to do it? Couldn't there be a simple property in the DialogParameters?

Thanks in advance,

Luís Henrique

1. Add items (click add new item).
2. Select item (select grid view row).
3. Change Quantity or Unit Price in grid view cell, the sum quantity and line total updated.
4. Change Quantity or Unit Price in other control (textbox), the sum quantity and line total not updated.
5. Add New Item or delete an Item. The sum quantiy and line total updated.

How can I fix the change quantity or unit price in other controll will update the sum quantity and line total?

Thanks

Xaml:

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:RadGridView_Bugs"
        xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" x:Class="RadGridView_Bugs.MainWindow"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition/>
            <ColumnDefinition Width="Auto"/>
        </Grid.ColumnDefinitions>
        <telerik:RadGridView Name="_gridView" AutoGenerateColumns="False" ShowColumnFooters="True">
            <telerik:RadGridView.Columns>
                <telerik:GridViewDataColumn Header="Quantity" DataMemberBinding="{Binding Path=Quantity}">
                    <telerik:GridViewDataColumn.AggregateFunctions>
                        <telerik:SumFunction SourceField="Quantity" Caption="Quantity Total: "/>
                    </telerik:GridViewDataColumn.AggregateFunctions>
                </telerik:GridViewDataColumn>
                <telerik:GridViewDataColumn Header="Unit Price" DataMemberBinding="{Binding Path=UnitPrice}"/>
                <telerik:GridViewDataColumn Header="Line Total" DataMemberBinding="{Binding Path=LineTotal}">
                    <telerik:GridViewDataColumn.AggregateFunctions>
                        <telerik:SumFunction SourceField="LineTotal" ResultFormatString=" {0:N0}" Caption="Line Total: "/>
                    </telerik:GridViewDataColumn.AggregateFunctions>
                </telerik:GridViewDataColumn>
            </telerik:RadGridView.Columns>
        </telerik:RadGridView>
        <StackPanel Grid.Column="1">
            <StackPanel Orientation="Horizontal">
                <Label Content="Quantity"/>
                <TextBox Name="_quantity" MinWidth="100" Text="{Binding ElementName=_gridView, Path=SelectedItem.Quantity, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
            </StackPanel>
            <StackPanel Orientation="Horizontal">
                <Label Content="Unit Price"/>
                <TextBox Name="_unitPrice" MinWidth="100" Text="{Binding ElementName=_gridView, Path=SelectedItem.UnitPrice, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"/>
            </StackPanel>
            <StackPanel Orientation="Horizontal">
                <Label Content="Line Total"/>
                <TextBlock MinWidth="100" Text="{Binding ElementName=_gridView, Path=SelectedItem.LineTotal, Mode=OneWay}"/>
            </StackPanel>
            <Button Content="Add New Item" Name="addNewItem" Click="addNewItem_Click"/>
        </StackPanel>
       
    </Grid>
</Window>

Code behind:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace RadGridView_Bugs
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        private void addNewItem_Click(object sender, RoutedEventArgs e)
        {
            _gridView.Items.Add(new LineItem() { Quantity = 1, UnitPrice = 100 });
        }
    }
    public sealed class LineItem : INotifyPropertyChanged
    {
        private decimal _quantity;
        private decimal _unitPrice;
        public LineItem()
        {
        }
        /// <summary>
        /// Gets or sets Quantity.
        /// </summary>
        public decimal Quantity
        {
            get { return _quantity; }
            set
            {
                if (value != _quantity)
                {
                    _quantity = value;
                    this.OnPropertyChanged("LineTotal");
                    this.OnPropertyChanged("Quantity");
                }
            }
        }
        /// <summary>
        /// Gets or sets UnitPrice.
        /// </summary>
        public decimal UnitPrice
        {
            get { return _unitPrice; }
            set
            {
                if (value != _unitPrice)
                {
                    _unitPrice = value;
                    this.OnPropertyChanged("LineTotal");
                    this.OnPropertyChanged("UnitPrice");
                }
            }
        }
        public decimal LineTotal => this.Quantity * this.UnitPrice;
        private void OnPropertyChanged(string propertyName)
        {
            this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
        public event PropertyChangedEventHandler PropertyChanged;
    }
}

When editing a cell in a RadGridView, the normal behavior for the escape key is to leave edit mode but retain focus on the same cell; if the enter key is pressed, to commit the edit and advance focus to the next editable cell.

My boss would like for me to modify the behavior so that if enter is pressed but the cell's value has not changed, to act as if it were the escape key instead. While I have been able to cancel the commit, but the focus still advances to the next editable cell, and that's not what he wants.

What is the best way to achieve what we're looking for? Thanks in advance for your help.