Questions on UI for WPF Forum

5 answers

291 views

I have a user control that contains a RadDataForm and a button.

The button is bound to a custom command that has xxx_CanExecute() and xxx_Executed() methods defined.

I want xxx_CanExecute() to set e.CanExecute to false, if the form has any validation errors. I'm getting the user control passed as sender, and from that I can get a reference to the RadDataForm. But I can't for the life of me figure out how to tell if the form has any validation errors. In the debugger I can see a validationErrors collection on the form, but that seems to be private. ValidateItem() always returns true, regardless.

Seems to me that I'm missing something simple. Can someone point me in the right direction?

DataForm

answered on 21 Jan 2014

1 answer

155 views

Prevent from removing a node after a drop

Hi,

I upgraded from version 2012.3.1129.40 to 2013.3.1204.40.
With this new version I didn't find how to prevent from removing a node after drag & drop.
In the older version I was able to do it with:

public MyView()

{

InitializeComponent();

this.m_cellTreeView.PreviewDragEnded += this.OnPreviewDragEnded;

}

private void OnPreviewDragEnded(object sender, RadTreeViewDragEndedEventArgs e)

{

e.Handled = true;

}

With the new version, I'm using your recommendations: I use the DragDropManager class only, I set the DragDropExecutionMode to New but the PreviewDragEnded handler is not called anymore and the event PreviewDragEnded is marked as deprecated.
What is the best way to do this ?

Thanks,

TreeView

answered on 20 Jan 2014

1 answer

559 views

Floating License?

Hi,

In the purchase section it says:

1 License for a single-named user.

In the license agreement it says:
1.2 Scope of Use. The Software is licensed, not sold, on a per-seat basis. You may only allow the number of individuals in Your organization to use the Software that corresponds to the maximum number of License seats You have purchased from Telerik hereunder. This means that at any given time, the number of individuals authorized to use the Software under the License (each a “Licensed Developer”) cannot exceed the number of License seats that You have purchased from Telerik and for which You have paid Telerik all applicable License Fees pursuant to this Agreement. The Software is in “use” on a computer when it is loaded into temporary memory (i.e. RAM) or installed into permanent memory (e.g. hard disk or other storage device) of that computer for development purposes. Your Licensed Developers may install the Software on multiple machines, so long as the Software is not being used simultaneously for development purposes at any given time by more Licensed Developers than You have License seats...

The first seems to mean that if someone takes over GUI development in a project, we need a new license, the second seems to imply it's like a floating license and only the number of users, no matter who they are, must not exceed the number of licenses.

Which is it?

General Discussions

answered on 20 Jan 2014

1 answer

201 views

Treeview column

Hi,
I would like to create a new RadGridViewColumn similar to GridViewComboBoxColumn.
The new column should contains a TreeView inside the dropdown to show the ItemsSource in hierarchical mode.
Is it possible to obtain this? Can you post me an example?

Thanks.

GridView

answered on 20 Jan 2014

1 answer

148 views

Open a child window from tile view item

Hello;

Is it possible to open a child window from a tile view item. I have defined a button in the normal view, then tried to bind the click to a command that will open a child window. I tried in different ways : using event, using showDialog but seems not working from the tileview item. It worked fine from a normal WPF application.

Please let me know if it is possible. I spend the whole trying but not results.
FYI, I use MVVM & WPF

Thanks for your support
Samira

TileView

answered on 20 Jan 2014

2 answers

270 views

Exception at Telerik.Windows.Automation.Peers.ScatterLineSeriesAutomationPeer.GetChildrenCore()

This error is happening consistently on plotting series in "one of the user machine." Its working fine on other machines..

We are using Telerik.Windows.Controls.Charting, File version is 2013.1.220.40.
This also seems to be happening when HP Unified Function Testing tool is on.

Is this a known issue? Any help is appreciated.

Method: App.HandleException
Exception Method: Enumerable.SingleOrDefault
Message: Sequence contains more than one element

Stack Trace:    at System.Linq.Enumerable.SingleOrDefault[TSource](IEnumerable`1 source)
   at Telerik.Windows.Automation.Peers.ScatterLineSeriesAutomationPeer.GetChildrenCore()
   at System.Windows.Automation.Peers.AutomationPeer.EnsureChildren()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateChildrenInternal(Int32 invalidateLimit)
   at System.Windows.Automation.Peers.AutomationPeer.UpdateChildren()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
   at System.Windows.ContextLayoutManager.fireAutomationEvents()
   at System.Windows.ContextLayoutManager.UpdateLayout()
   at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
   at System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
   at System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
   at System.Windows.Media.MediaContext.RenderMessageHandlerCore(Object resizedCompositionTarget)
   at System.Windows.Media.MediaContext.RenderMessageHandler(Object resizedCompositionTarget)
   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)"

ChartView

answered on 20 Jan 2014

1 answer

112 views

SelectAll even if I click outside of the defined mask

Hi Team!

I have set this property on my masked input controls

this.SelectionOnFocus = Telerik.Windows.Controls.SelectionOnFocus.SelectAll;

And it works BUT only when I click inside the mask area....
If I click outside the mask area of say my textbox, it does nothing, makes user think he can't even type in that control

How can I make it do a selectAll even if user clicks outside the mask area of the control? Otherwise like I said they will think they can't type in the control.

MaskedInput (Numeric, DateTime, Text, Currency)

answered on 20 Jan 2014

1 answer

82 views

Canceling SelectionChanging event and expanding item causes a crash

I just want to let you know about a bug that I found and I do not really see how to report a bug (and not a feature suggestion) in the issue tracker.

I have a RadTreeListView.
I want to click on an item on the list to expand it.
So that I implemented the following:

<t:RadTreeListView x:Name="radTreeListView" AutoGenerateColumns="False" SelectionChanging="radTreeListView_SelectionChanging">

<t:RadTreeListView.ChildTableDefinitions>

<t:TreeListViewTableDefinition ItemsSource="{Binding Children}" />

</t:RadTreeListView.ChildTableDefinitions>

<t:RadTreeListView.Columns>

<t:GridViewDataColumn DataMemberBinding="{Binding Name}" Header="Name" IsReadOnly="True" >

<t:GridViewDataColumn.CellTemplate>

<DataTemplate>

<Label Content="{Binding Name}"></Label>

</DataTemplate>

</t:GridViewDataColumn.CellTemplate>

</t:GridViewDataColumn>

</t:RadTreeListView.Columns>

</t:RadTreeListView>

and a handler:

private void radTreeListView_SelectionChanging(object sender, SelectionChangingEventArgs e)

{

var selectedItem = e.AddedItems.FirstOrDefault();

e.Cancel = true;

this.radTreeListView.ExpandHierarchyItem(selectedItem);

}

This causes an exception when I start the application (basically, when the selection is changing).

Removing e.Cancel = true line solves the issue, but well... if I want to cancel this event, then the app crashes.

TreeListView

answered on 20 Jan 2014

2 answers

1.0K+ views

MessageBox automatically closed after closing a RadWindow

Hi everyone,

I am developing a WPF application in my company.
I use RadControls for WPF Q3 2013 trial version.

I have written a sample project made up of a MainWindow and a UserControl.
The MainWindow contains a Button and I have written an handler to the Button's Click event.

Here is the MainWindow's code-behind :

using System;

using System.Collections.Generic;

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;

using Telerik.Windows.Controls;

namespace MessageBoxAutoClosed

{

/// <summary>

/// Interaction logic for MainWindow.xaml

/// </summary>

public partial class MainWindow : Window

{

public MainWindow()

{

InitializeComponent();

}

private void Button_Click(object sender, RoutedEventArgs e)

{

UserControl1 l_userControl = new UserControl1();

RadWindow l_hostWindow = new RadWindow()

{

Owner = System.Windows.Application.Current.MainWindow,

WindowStartupLocation = WindowStartupLocation.CenterOwner

};

ScrollViewer l_scrollViewer = new ScrollViewer();

l_scrollViewer.VerticalScrollBarVisibility = ScrollBarVisibility.Auto;

l_scrollViewer.HorizontalScrollBarVisibility = ScrollBarVisibility.Auto;

l_scrollViewer.Content = l_userControl;

l_hostWindow.Content = l_scrollViewer;

l_hostWindow.Show();

//l_hostWindow.Close();

MessageBox.Show("MessageBox", "MessageBox", MessageBoxButton.OK, MessageBoxImage.Information, MessageBoxResult.OK);

}

I do not have to click the OK button in the MessageBox to close it because the MessageBox is automatically closed.
Why ?

The MessageBox is not automatically closed when the following line is missing : l_hostWindow.Close();

Thank you in advance for your help

Window

answered on 20 Jan 2014

1 answer

138 views

Don't want Chart to rescale automatically

Hi,

Currently I have a candlestick chart as a usercontrol imbedded in a dock control. everytime I resize my min window, the chart resizes as well, causing it to become more and more compressed.

Instead, I would much prefer if my chart does not automatically resize with the main window, but instead, is clipped. In this case, the user would have to use the scroll bar to view the clipped part of the chart.

Can anyone suggest a way that this may be done, or point me in the direction of a WPF example?

Thanks in advance.

Chart

answered on 20 Jan 2014