Questions on UI for WPF Forum

2 answers

64 views

When implementing ScheduleViewDragDropBehavior, the behavior performs correctly, but the XAML designer indicates "CustomScheduleViewDragDropBehavior is not a valid value for property 'DragDropBehavior'."

<telerik:RadScheduleView.DragDropBehavior>

<ViewModels:CustomScheduleViewDragDropBehavior/>

</telerik:RadScheduleView.DragDropBehavior>

Regrards,

ScheduleView

answered on 06 May 2020

2 answers

137 views

RadWindow as MainWindow ignores xaml properties

Windows 10 Pro 64, Visual Studio 2019, Telerik.UI.for.Wpf.NetCore.Xaml 2020.1.218

I'm starting up a new project and want to use RadWindow as my main window, so I found this explanation of what to do and followed it:

https://www.telerik.com/support/kb/wpf/window/details/how-to-use-radwindow-as-main-window

My problem is that the RadWindow seems to be ignoring the properties I put into the MainWindow.xaml, so it displays a main window just large enough to contain the title bar in the upper left corner of my desktop with "RadWindow" as the header. I added code in the MainWindow's constructor in the code-behind and that works. What have I missed?

MainWindow.xaml:

<telerik:RadWindow x:Class="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"

Header="Program Launcher" WindowStartupLocation="CenterScreen" Height="200" Width="400">

<Grid>

</Grid>

</telerik:RadWindow>

MainWindow.xaml.cs:

using System;

using System.Collections.Generic;

using System.Text;

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 ProgramLauncher

{

/// <summary>

/// Interaction logic for MainWindow.xaml

/// </summary>

public partial class MainWindow : RadWindow

{

public MainWindow()

{

//InitializeComponent();

// Header = "Program Launcher";

// WindowStartupLocation = WindowStartupLocation.CenterScreen;

// Height = 200;

// Width = 400;

}

Note: Code that sets window properties is coded out to show initial conditions that caused the problem.

app.xaml:

<Application x:Class="ProgramLauncher.App"

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

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

<Application.Resources>

<ResourceDictionary>

<ResourceDictionary.MergedDictionaries>

</ResourceDictionary.MergedDictionaries>

</ResourceDictionary>

</Application.Resources>

</Application>

app.xaml.cs:

using System;

using System.Collections.Generic;

using System.Configuration;

using System.Data;

using System.Linq;

using System.Windows;

namespace ProgramLauncher

{

/// <summary>

/// Interaction logic for App.xaml

/// </summary>

public partial class App : Application

{

public App()

{

//this.InitializeComponent();

}

protected override void OnStartup(StartupEventArgs e)

{

new MainWindow().Show();

base.OnStartup(e);

}

Bad Main Window.png shows the main window as it originally appeared when I was assigning the properties only in the xaml. Good Main Window.png shows how the main window should appear, centered on my screen. That's how it looks after I added the code to MainWindow's constructor to set the properties.

Window

answered on 06 May 2020

4 answers

120 views

Dragging Tabs stutter

When activating tabs by clicking on the header, some tabs take a while to load because the contents are slow to load. This is not a problem.

However, when this happens, frequently the tab is dragged and torn off the radtabbedwindow, creating a new one.

Is there a way to stop tearing off tabs if the mouse has move less than 20 pixels for example?

TabbedWindow

answered on 05 May 2020

3 answers

154 views

UI Automation tests

Hi,
I try to perform UI automation tests.
I use Microsoft UI Automation Test Library.
The way I try to do that is to place some shapes on the map and check if they are visible.
Now the only information I can get is RadMap Control.

Is it possible to go deeper in RadMap Control and find shapes placed on it using UI Automation Library?

Regards,
Rafał

Map

answered on 05 May 2020

1 answer

140 views

No data when using MVVM

I'v tried to follow a few of the how to do it but I do not get any data in my controller.

The code below is my latest attempt. If I create RadTreeViewItems in my ViewModel and then set them directly to the ItemsSource the treview is populated.

Can anyone see if I am missing something?

<UserControl.Resources>

        <viewmodels:FilterViewModel x:Key="FVM" />

        <DataTemplate x:Key="QualifierHDT"
                      DataType="{x:Type models:Qualifier}">
            <TextBlock Text="{Binding Name}" />
        </DataTemplate>

        <HierarchicalDataTemplate x:Key="ComponentHDT"
                                  DataType="{x:Type models:Component}"
                                  ItemsSource="{Binding Components}"
                                  ItemTemplate="{StaticResource QualifierHDT}">
            <TextBlock Text="{Binding Name}" />
        </HierarchicalDataTemplate>

        <HierarchicalDataTemplate x:Key="SystemCollectionHDT"
                                  DataType="{x:Type models:SystemCollection}"
                                  ItemsSource="{Binding SystemCollections}"
                                  ItemTemplate="{StaticResource ComponentHDT}">
            <TextBlock Text="{Binding Name}" />
        </HierarchicalDataTemplate>

        <HierarchicalDataTemplate x:Key="BuildingHDT"
                                  DataType="{x:Type models:Building}"
                                  ItemsSource="{Binding Buildings}"
                                  ItemTemplate="{StaticResource SystemCollectionHDT}">
            <TextBlock Text="{Binding Name}" />
        </HierarchicalDataTemplate>

        <HierarchicalDataTemplate x:Key="AreaHDT"
                                  DataType="{x:Type models:Area}"
                                  ItemsSource="{Binding Areas}"
                                  ItemTemplate="{StaticResource BuildingHDT}">
            <TextBlock Text="{Binding Name}" />
        </HierarchicalDataTemplate>

        <Style x:Key="ItemContainerStyle" TargetType="{x:Type telerik:RadTreeViewItem}">
            <Setter Property="IsSelected" Value="{Binding Path=Selected}"/>
            <Setter Property="IsExpanded" Value="{Binding Path=Expanded}"/>
        </Style>

        <helpers:FilterViewTemplateSelector x:Key="myDataTemplateSelector"
                                            AreaTemplate="{StaticResource AreaHDT}"
                                            BuildingTemplate="{StaticResource BuildingHDT}"
                                            SystemCollectionTemplate="{StaticResource SystemCollectionHDT}"
                                            ComponentTemplate="{StaticResource ComponentHDT}"
                                            QualifierTemplate="{StaticResource QualifierHDT}"/>

    </UserControl.Resources>

<telerik:RadTreeView MinWidth="200px"
                             ItemsSource="{Binding Source={StaticResource FVM}}"
                             ItemTemplate="{StaticResource AreaHDT}"
                             ItemContainerStyle="{StaticResource ItemContainerStyle}"
                             ItemTemplateSelector="{StaticResource myDataTemplateSelector}">
        </telerik:RadTreeView>

Class structure

Class Area

string Name;

ICollection<Building> buildings

Class Building

string Name:

ICollection<SystemCollection> SystemCollections

Class SystemCollection

string Name;

ICollection<Componennt> Components

Class Component

string Name;

ICollection<Qualifier> Qualifiers

Class Qualifier

String Name;

TreeView

answered on 05 May 2020

1 answer

130 views

Set the DateTimeWatermarkContent based on the IsEnabled property

As the title suggest, my question is if it is possible to set the DateTimeWatermarkContent of the DateTimePicker control based on if the DatePicker is enabled or not.

More specifically what I want to do is to remove the DateTimeWatermarkContent text when the control is disalbled.

How would I go about doing that?

DateTimePicker

answered on 05 May 2020

1 answer

227 views

UI Zooming with RadGridView

We are developing projects using Telerik controls. Including 1 module with zoom feature for RadGridView. I ran your sample in link (https://www.telerik.com/forums/scale-font-with-grid-width#dO4Kn_YdzEW3UENkNr5GUg) .

But there was a problem when I zoomed out. Border in row is lost, and this disappearance is asynchronous (In the photo attached). You can consider this issue not help me?

GridView

answered on 05 May 2020

1 answer

112 views

Appointment.UniqueId Versus SqlAppointments.SqlAppointmentID

Hello,

I've just started reviewing RadScheduleView with the intent on connecting it with data in a SQL database. While reviewing the documentation at

https://docs.telerik.com/devtools/wpf/controls/radscheduleview/populating-with-data/binding-to-database/binding-to-db-datatier

I noticed the table definition for SqlAppointments has the column definition SqlAppointmentId as type Int. I expected to find a property of type Int in the Appointment class, but found only the property UniqueID of type string.

During test, the UniqueID property produces a value that looks to be a GUID. There are no properties within the class definition that would seem to support the database column type.

What is the designed primary key for synchronizing database records with in-memory runtime instances of an appointment?

ScheduleView

answered on 04 May 2020

5 answers

401 views

Exception in RadComboBoxAutomationPeer

The exception occurred when we clicked the RadComboBox to update the items.

EXCEPTION :System.ArgumentNullException: Value cannot be null.
Parameter name: key
   at System.ThrowHelper.ThrowArgumentNullException(ExceptionArgument argument)
   at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
   at Telerik.Windows.Automation.Peers.RadComboBoxAutomationPeer.CreateItemAutomationPeer(Object item)
   at System.Windows.Automation.Peers.ItemsControlAutomationPeer.GetChildrenCore()
   at Telerik.Windows.Automation.Peers.RadComboBoxAutomationPeer.GetChildrenCore()
   at System.Windows.Automation.Peers.AutomationPeer.EnsureChildren()
   at System.Windows.Automation.Peers.AutomationPeer.UpdateChildrenInternal(Int32 invalidateLimit)
   at System.Windows.Automation.Peers.ItemsControlAutomationPeer.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.ContextLayoutManager.fireAutomationEvents()
   at System.Windows.ContextLayoutManager.UpdateLayout()
   at System.Windows.ContextLayoutManager.UpdateLayoutCallback(Object arg)
   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.Interop.HwndTarget.OnResize()
   at System.Windows.Interop.HwndTarget.HandleMessage(WindowMessage msg, IntPtr wparam, IntPtr lparam)
   at System.Windows.Interop.HwndSource.HwndTargetFilterMessage(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 System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object source, Delegate callback, 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)

ComboBox

answered on 01 May 2020

2 answers

85 views

Changing background of TreeListView HeaderCell?

Is it possible to change the background of the selected TreeListView HeaderCell? Customers complain that the solid background of the currently sorted column can be distracting.

We would prefer a white background with a thick underline as in the screenshot. We already tried changing the style of GridViewHeaderCell, but unfortunately, this doesn't apply to the sorted/selected column.

Is there a way to achieve this without duplicating the entire template?

Best Regards,

Martin

TreeListView

answered on 01 May 2020