Questions on UI for WPF Forum

1 answer

636 views

Dear team,
we have a problem with RadGridView performance. He have the following scenario:
- We request data to server and it returns 44 rows into a list.
- We bind this list to a RadGridView with 8 columns.
Some remarks:
- One column is a template column with a checkbox.
- We have a style for the gridview and gridview rows.
- We have auto with for these columns.

This process takes 1.615s. The 30% was spent by the server and the 70% by gridview. We don't know how to solve this problem. We have done the following tests:
- We have removed all styles and template column.
- Removing one column we gain a 6,8%.
- Removing 2 columns we gain a 16,1%, etc.
- Having only one column we gain 54,64%! It means that rendering speed depends on number of columns?
- Fixing columns width we can gain a 10%, 0,2s.
- Replacing this grid by a WPF grid we gain a 42%, 0,6s. This means that WPF standard grid is faster that RadGridView?

We hope you can help us.
Thank you in advance.

GridView

answered on 13 Oct 2016

5 answers

123 views

Drag drop Group to change Group's order.

Hi,
How do I drag drop a group in the GridView to change Group's order?

Thank you.

GridView

answered on 13 Oct 2016

1 answer

304 views

Example of RadPieChart with series provider for multiple DoughnutSeries?

Looking for a way to dynamically populate multiple doughnut series so that I can make my "ring" chart that I made with the winforms version.

I've looked at the "Dynamic Number of Series (ChartSeriesProvider)" article. There doesn't seem to be a "PieSeriesDescriptor", and using the "ChartSeriesDescriptor" that is for "all series", it complains about "<telerik:ChartSeriesDescriptor " with the errors:

The type "ChartSeriesDescriptor" is abstract and must include an explicit value

Type 'ChartSeriesDescriptor' is not usable as an object element because it is not public or does not define a public parameterless constructor or a type converter.

ChartView

answered on 13 Oct 2016

3 answers

159 views

Update another cell using CreateCellEditElement in current cell

Hello, lets say that we are using the radGridView and we have some columns like above:

First Name, Last Name, Sex, Age, Type1, Type2

The column "Type1" has a custom editor that implements the classes:

CreateCellElement and CreateCellEditElement using a combobox for selection of value.

Also i must clarify that column "Type2" depents on column's "Type1" value

So how can we clear in the current row the column's "Type2" value when the value of column "Type1" is changed through the CreateCellEditElement?

Thanks

GridView

answered on 13 Oct 2016

1 answer

182 views

How to build the Tree View from the GraphSource

Once I build a RadDiagram I have basically one List of Items and one List of Links.

Now, would it be possible to Bind a TreeView with these two objects only?

See the screenshot attached for example. The Diagram consists of four objects linked together.

Now, Is it possible to have a TreeView representation of the Diagram like in the screenshot attached?

From the documentation seems to be that this cannot be done, unless I create dynamically a brand new List (i.e. TreeSource) for the tree from the Items and Links objects.

Where TreeSource would basically be a:

public ObservableCollection<TreeViewNode> TreeSource;

public class TreeViewNode {

public string DisplayName { get; set; }

public ObservableCollection<TreeViewNode> Nodes { get; set; }

}

And the XAML

 <HierarchicalDataTemplate x:Key="TreeViewTemplate" ItemsSource="{Binding Nodes}"    >

                <TextBlock Text="{Binding DisplayName}"/>

            </HierarchicalDataTemplate>

<telerik:RadTreeView x:Name="tree" ItemsSource="{Binding TreeSource}"> ItemTemplate="{StaticResource TreeViewTemplate}"

Diagram

answered on 13 Oct 2016

6 answers

217 views

Setting IsExpanded from a UserControl

I am working on a Prism WPF project and I have a RadExpander in the shell of my project.

<Grid>

<ContentControl prism:RegionManager.RegionName="ContentRegion" />

<tel:RadExpander x:Name="MenuFlyOut"

IsExpanded="True"

tel:AnimationManager.IsAnimationEnabled="True"

ExpandDirection="Right"

Width="210"

Background="CornflowerBlue"

Margin="0,0,159,0">

<tel:RadExpander.Header>

<TextBlock x:Name="ExpanderCaption" Text="Menu" Foreground="White"/>

</tel:RadExpander.Header>

<tel:RadExpander.Content>

<StackPanel Margin="10,20,0,0"

Width="200"

HorizontalAlignment="Left"

VerticalAlignment="Top"

Opacity="1">

//Button that opens UserControl in ContentRegion

//stuff in the stackpanel

</StackPanel>

</tel:RadExpander.Content>

</tel:RadExpander>

</Grid>

Currently since the RadExpander IsExpanded is set to "true" when the UserControl loads, the RadExpander is, obviously, still expanded. What I am trying to do is change the state of IsExpanded when the UserControl finishes loading.

my latest attempt was to set it in the codebehind of the UserControl:

public partial class UserControlContent : UserControl

{

public UserControlContent()

{

InitializeComponent();

var setExpander = new Shell();

setExpander.MenuFlyOut.IsExpanded = false;

}

But that didn't work.. I've tried a few other ways to do this. Event Triggers, Binding to a property which calls a method that sets IsExpanded.

Obviously, I'm missing something, and help would be appreciated.

Expander

answered on 13 Oct 2016

2 answers

156 views

RadMap displaying ShapeFile incorrectly

I'm trying to get a shapefile into the radmap (intending to be similar to the hotel floor plan example), however my shapefile does not get displayed properly. It's using WGS84, and is displayed correctly with every shapefile viewer i can find

Attached expected and resulting outputs

Map

answered on 12 Oct 2016

2 answers

277 views

GanttView: Updated GridViewPart Columns Width

If i setup a GanttView with some columns with a width of 100, then I'm unable to get the actual width of a column after the user resizes it; seems to always return the original '100' value. Is there some way of retrieving the updated width of these columns?

GanttView

answered on 12 Oct 2016

3 answers

365 views

PropertyGrid throws exception when nested property of an ExpandoObject is expanded

Hi,

I'm using the RadPropertyGrid to show the properties of ExpandoObject with AutoGeneratePropertyDefinitions=true. The ExpandoObject has two nested properties. The first one is based on a public class with some public properties, the other is a second ExpandoObject. When I run the code the PropertyGrid shows the two nested properties as expected (i.e. they are collapsed).

When I expand the nested properties based on the class by clicking the expand-button (plus-sign in front of the nested propertie's name) the class' properties are shown as expected (see screenshot).

When I click the expand-button to expand the nested properties based on the second ExpandoObject the following exception is thrown:

An unhandled exception of type 'System.InvalidOperationException' occurred in System.Core.dll

Additional information: Property path is not valid. 'System.Dynamic.ExpandoObject+MetaExpando' does not have a public property named 'X'.

What can I do to solve this problem? I'm using the latest version "2016.3.194 (Dev)" of UI for WPF. Thank you for your help.

Best regards

Christian

P.S. The problem can be reproduced using the following XAML and code

<Window x:Class="TelerikWpfApp2.MainWindow"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"

xmlns:propertyGrid="clr-namespace:Telerik.Windows.Controls.Data.PropertyGrid;assembly=Telerik.Windows.Controls.Data"

Title="RadPropertyGrid with nested properties based on ExpandoObject" Height="350" Width="508.828">

<StackPanel>

<telerik:RadPropertyGrid x:Name="MyPropertyGrid" NestedPropertiesVisibility="Visible" />

</StackPanel>

</Window>

using System;

using System.Windows;

using System.Dynamic;

namespace TelerikWpfApp2

{

/// <summary>

/// Interaction logic for MainWindow.xaml

/// </summary>

public partial class MainWindow : Window

{

public MainWindow()

{

InitializeComponent();

FillPropertyGrid();

}

private void FillPropertyGrid()

{

dynamic item = new ExpandoObject();

dynamic nestedPropertyBasedOnExpando = new ExpandoObject();

nestedPropertyBasedOnExpando.X = 1.0;

nestedPropertyBasedOnExpando.Y = 2.0;

item.NestedPropertyBasedOnClass = new Point(3.0, 4.0);

item.NestedPropertyBasedOnExpando = nestedPropertyBasedOnExpando;

// if the following propeties are added then no exception is thrown;

// but nestedProperty1.X and item.X are bound to each other!

// item.X = 0.0;

// item.Y = 0.0;

MyPropertyGrid.Item = item;

}

PropertyGrid

answered on 12 Oct 2016

1 answer

196 views

Read only range insert and delete

Hi,

I need a functionality to allow users to add e a text that cannot be edited but can be deleted. It needs to have different style than ordinary text.

I Implemented it as.

        private void AddHeading(string key)
        {
            if (HeadingsProvider == null)
                return;
            RtbEditor.BeginUndoGroup();
            var box = RtbEditor.Document.GetLayoutBoxByPosition(RtbEditor.Document.CaretPosition.Location);
            var element = box.AssociatedDocumentElement;
            while (element is Inline && !(element is Span))
                element = element.Parent;
            while (element is Inline)
                element = element.Parent;
            var paragraph = element as Paragraph;
            if (paragraph?.IsEmpty == false)
                RtbEditor.InsertParagraph();
            var headings = HeadingsProvider.GetHeadings(key).ToList();
            for (int i = 0; i < headings.Count; i++)
            {
                RtbEditor.Document.Selection.Clear();
                var lStart = RtbEditor.Document.CaretPosition.Location;
                RtbEditor.InsertInline(new Span(" "));
                RtbEditor.ChangeStyleName("HeadingChar", false);
                RtbEditor.Insert(headings[i]);
                RtbEditor.InsertInline(new Span(" "));
                var lEnd = RtbEditor.Document.CaretPosition.Location;
                var start = new DocumentPosition(RtbEditor.Document);
                start.SetPosition(lStart);
                var end = new DocumentPosition(RtbEditor.Document);
                end.SetPosition(lEnd);
                RtbEditor.Document.Selection.AddSelectionStart(start);
                RtbEditor.Document.Selection.AddSelectionEnd(end);
                RtbEditor.InsertReadOnlyRange();
                RtbEditor.Document.Selection.Clear();
                if (i < headings.Count - 1)
                    RtbEditor.InsertParagraph();
            }
            RtbEditor.EndUndoGroup();
        }
        private void RemoveHeading()
        {
            var box = RtbEditor.Document.GetLayoutBoxByPosition(RtbEditor.Document.CaretPosition.Location);
            var span = box.AssociatedDocumentElement as Span;
            if (span == null)
                return;
            var sibling = span.PreviousSibling;
            while (sibling != null && !(sibling is ReadOnlyRangeStart) && !(sibling is ReadOnlyRangeEnd))
                sibling = sibling.PreviousSibling;
            var start = sibling as ReadOnlyRangeStart;
            if (start == null)
                return;
            var end = start.End;
            if (end == null)
                return;
            RtbEditor.Document.CaretPosition.MoveToInline(start);
            var lStart = RtbEditor.Document.CaretPosition.Location;
            RtbEditor.Document.CaretPosition.MoveToInline(end);
            var lEnd = RtbEditor.Document.CaretPosition.Location;
            var pStart = new DocumentPosition(RtbEditor.Document);
            pStart.SetPosition(lStart);
            var pEnd = new DocumentPosition(RtbEditor.Document);
            pEnd.SetPosition(lEnd);
            RtbEditor.BeginUndoGroup();
            RtbEditor.DeleteReadOnlyRange(start);
            RtbEditor.Document.Selection.Clear();
            RtbEditor.Document.Selection.AddSelectionStart(pStart);
            RtbEditor.Document.Selection.AddSelectionEnd(pEnd);
            RtbEditor.Delete(false);
            RtbEditor.EndUndoGroup();
        }

The insert part kind of work. I need to insert an empty span before and after so that the special style not propagate when you type after the heading. I tried to insert Span(""), but it crashes the editor... I can live with " ".

The problem is that remove heading does not work. While the ReadOnlyRange is removed, the text is not. It remains in the RTB and it is selected. you need to click on another paragraph and then you can delete it manually, but then you ending with editable heading if you won't delete it manually.

RichTextBox

answered on 12 Oct 2016