Questions on UI for WPF Forum

4 answers

249 views

Hi,

I have requirement to display multiple columns under ComboBox with title and it should be also allow to sort RadGridView items. To achieve these requirement I decide to place a RadGridView inside RadComboBox.

I have almost achieved these requirement however there is only one issue. When I click on an item of RadGridView the RadComboBox is not closing down which is RadComboBox default behavior.

I tried to set IsDropDownOpen property of RadComboBox when user selects an item but it still not working.

To modify ControlTemplate of RadComboBox I referred to following blog.
http://www.nullskull.com/a/1359/wpf-datagrid-as-combobox-dropdown.aspx

In my case I have place RadGridView inside NonEditableTemplate. I don't know it's correct or not but yes it is working except the aforementioned issue. PFA image which displays the result so far I able to achieve.

Please help to resolve this issue.

ComboBox

answered on 29 Dec 2016

1 answer

311 views

CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression

I've recently upgraded my visual studio from 2010 to 2015, and since them, I'm getting a lot of warnings in my output window like:

System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='10705061'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='1587067'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='4309168'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='59694858'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='1914083'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='19024873'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='50812954'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='4881566'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='18343908'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='20169503'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='35212414'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='41054801'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='35526744'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='55199627'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='955278'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='42987539'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='55391087'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'
System.Windows.Freezable Warning: 1 : CanFreeze is returning false because a DependencyProperty on the Freezable has a value that is an expression; Freezable='System.Windows.Media.TranslateTransform'; Freezable.HashCode='9570975'; Freezable.Type='System.Windows.Media.TranslateTransform'; DP='X'; DpOwnerType='System.Windows.Media.TranslateTransform'

It happens every time a value in the gridview is changed.

It affects the performance of visual studio, since the output window is very busy.

Why it happens? It is something you are doing wrong and can be fixed?

Can I disable these warnings somehow?

Thanks.

GridView

answered on 29 Dec 2016

4 answers

209 views

Exporting to PDF, column width issue.

Hi,

I have an issue exporting a gridview to pdf when the gridview has a horizontal scrollbar and is wider than the container.

If I export without scrolling, the columns on the right hand side do not have their actual widths set properly, and are much less wide than the other columns. However, if I first scroll the scroll bar, and then scroll it back, when I export, the columns are the correct width.

Is there a way to programmatically do this? Is there a call on the gridview to auto size or best fit the columns or something like that? Do the columns actually have to be displayed on screen for the export to have the actual widths set?

GridView

answered on 29 Dec 2016

3 answers

273 views

Export to pdf/excel datetime column issue

Dear Telerik support,

My datetime columns arebehaving just the same as you can seein your article here

http://docs.telerik.com/devtools/wpf/controls/radgridview/export/how-to/export-datetime

Then i tried the given solution,but although the event is being called and the Format being attributed with the correct format, the solution doesn't not working for me. My datetime columns cells show as #########

Can you please check my code and see if i am missing something?

private void CustomGridview_ElementExportingToDocument(object sender, GridViewElementExportingToDocumentEventArgs e)

{

if (e.Element == ExportElement.Cell)

{

var cellExportingArgs = e as GridViewCellExportingEventArgs;

var parameters = cellExportingArgs.VisualParameters as GridViewDocumentVisualExportParameters;

if (cellExportingArgs.Column.GetType() == typeof(GridViewDataColumn))

{

if (((GridViewDataColumn)cellExportingArgs.Column).DataFormatString == "d")

{

parameters.Style = new CellSelectionStyle()

{

Format = new CellValueFormat(CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern)

};

}

if (((GridViewDataColumn)cellExportingArgs.Column).DataFormatString == "g")

{

parameters.Style = new CellSelectionStyle()

{

Format = new CellValueFormat(CultureInfo.CurrentCulture.DateTimeFormat.ShortDatePattern + " " + CultureInfo.CurrentCulture.DateTimeFormat.ShortTimePattern)

};

}

Thank you

GridView

answered on 28 Dec 2016

9 answers

226 views

AnimationException when mouse over the RadTimeBar

Hi!

Please advice me on what I'm doing wrong, when using RadTimeBar.
When my cursor reaches over the TimeBar, I get the AnimationException:
Cannot animate the 'Cursor' property on a 'System.Windows.Controls.Border' using a 'System.Windows.Media.Animation.ObjectAnimationUsingKeyFrames'. For details see the inner exception.
The XAML code:

<telerik:RadTimeBar Height="130" Name="RadTimeBar1"

PeriodEnd="04/10/2014 00:00:00"

PeriodStart="03/31/2012 00:00:00"

SelectionEnd="04/06/2012 00:00:00"

SelectionStart="04/05/2012 00:00:00"

Width="Auto" Cursor="Hand" Content="From here you can chose the interval the below data will be shown" IsManipulationEnabled="True" UseLayoutRounding="True">

<telerik:RadTimeBar.Intervals>

<telerik:YearInterval />

<telerik:MonthInterval />

<telerik:WeekInterval />

<telerik:DayInterval />

</telerik:RadTimeBar.Intervals>

</telerik:RadTimeBar>

TimeBar

answered on 28 Dec 2016

1 answer

150 views

Multiple series in the same 3d chart

Hi,

I'm trying to show on the same chart different series types, I need to show Point3d and also Surface3d.

I have no idea why it's not working, actually it shows my surface3d as point3d.

this is the xaml code:

Thanks!

ChartView3D

answered on 28 Dec 2016

2 answers

507 views

Validation Combobox

I have a combobox like below and i need to have a required field validation on it. 

<

telerik:RadComboBox x:Name="combobox" SelectionChanged="combobox_SelectionChanged" IsTextSearchEnabled="True" Width="120"

telerik:TextSearch.TextPath="Kode" Margin="2,0,0,0" IsEditable="True" IsReadOnly="True" SelectedItem=

"{Binding Path=SelectedItem, Mode=TwoWay, UpdateSourceTrigger=Explicit, NotifyOnValidationError=true, ValidatesOnExceptions=true}"

TextSearchMode="Contains" CanAutocompleteSelectItems="True" >

<ItemsControl.ItemTemplate>

<DataTemplate>

<Grid>

<Grid.ColumnDefinitions>

<ColumnDefinition Width="50" />

<ColumnDefinition Width="300"/>

</Grid.ColumnDefinitions>

<TextBlock Text="{Binding Kode}" Grid.Column="0"/>

<TextBlock Text="{Binding Nederlandse_omschrijving}" Grid.Column="1"/>

<TextBlock Text="{Binding Franse_omschrijving}" Grid.Column="2"/>

</Grid>

</DataTemplate>

</ItemsControl.ItemTemplate

>



DummyComboBox.ItemsSource = DummyCodeList.Load()

The load event returns a list of Objects (List<DummyObject>)

I can't quite get the validation working. 

Any suggestions ?

ComboBox

answered on 28 Dec 2016

4 answers

767 views

Highlight the selected row

When I add the code

private void radGridView1_RowFormatting(object sender, RowFormattingEventArgs e)

{

if ((bool)e.RowElement.RowInfo.Cells["BMP"].Value == true)

{

e.RowElement.DrawFill = true;

e.RowElement.GradientStyle = GradientStyles.Solid;

e.RowElement.BackColor = Color.Aqua;

}

else

{

e.RowElement.ResetValue(LightVisualElement.BackColorProperty, ValueResetFlags.Local);

e.RowElement.ResetValue(LightVisualElement.GradientStyleProperty, ValueResetFlags.Local);

e.RowElement.ResetValue(LightVisualElement.DrawFillProperty, ValueResetFlags.Local);

}

It will change the background color in the grid as expected. But now when I select a row it only highlights the cell I selected and then outlines the rest of the row. How can I get it to highlight the entire cell like it does on the rows the are the else row.

GridView

answered on 28 Dec 2016

2 answers

318 views

RadComboBox backspace clears control but doesn't select 'null' value object

I have seen multiple other posts about this (e.g. http://www.telerik.com/forums/backspace-clears-the-combobox-selecteditem) but I don't think any of them are asking the same question...

I have a RadComboBox which contains a collection of objects (i.e. it's not editable). I have set the SelectedValuePath to indicate which property contains the value that SelectedValue should represent. One of the items has a "null" as the value, so when the value that it is bound to is "null", this is the item which appears. I'm using MVVM to bind to a ViewModel, but I don't think that affects the issue.

When the backspace button is pressed, the ViewModel's property which is bound to SelectedValue is set to null (this doesn't happen if the "null" value object was the one that was selected at the time). But the issue is that the box contents are cleared. Since the SelectedValue is now null, I would expect the control to be showing the item whose SelectedValue is "null". Two good reasons why it ought to do that...

1) symmetry: that is what happens when the window first opens if the bound value is "null"

2) when the "null" value object was the one that was selected when backspace was pressed, the control didn't bother mentioning to the change to the bound ViewModel, so *it* believes that nothing has changed; but the UI now does not correspond with the SelectedValue.

Here is a really simplistic example:

Create a new WPF application.

Replace MainWindow.xaml with...

--Ends--

Add "MainWindowViewModel.cs", contents follow...

using System.ComponentModel;
using System.Runtime.CompilerServices;
namespace WpfApplication4
{
    public class MainWindowViewModel : INotifyPropertyChanged
    {
        private object _mySelectedValue;
        public event PropertyChangedEventHandler PropertyChanged;
        protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
        public object MySelectedValue
        {
            get
            {
                return _mySelectedValue;
            }
            set
            {
                _mySelectedValue = value;
                OnPropertyChanged();
            }
        }
    }
}

--Ends--

ComboBox

answered on 28 Dec 2016

1 answer

111 views

RadDocking controls issue

I am trying to evaluate WPF RadDocking control. I am in the process of replacing ActiPro docking window control with Telerik docking control in our WPF application. However, I ran into an issue with Telerik’s docking control. As shown in the picture in the attached file there is a gap between Pane 2 and Pane 5. I would like to be able to pin all the panes. It looks like the gap can be decreased only if one of the panes becomes a tabbed document. Could you please advise on how to get rid of the gap without making it be a document?

Thank you,
Marat Musaev

Docking

answered on 27 Dec 2016