InvalidOperationException when closing a RadWindow opened on a separated UI thread. The exception message is: "Cannot use a DependencyObject that belongs to a different thread than its parent Freezable."
To work this around, you can merge the Telerik.Windows.Controls.Navigation.xaml dictionary in the Resources of all RadWindow instances open on another thread and then set their Style property to the RadWindowStyle from the merged .xaml dictionary.
<telerik:RadWindow x:Class="WpfApp84.Window1"
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:WpfApp84" xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
mc:Ignorable="d" Height="450" Width="800" Style="{DynamicResource RadWindowStyle}">
<telerik:RadWindow.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Telerik.Windows.Controls.Navigation;component/Themes/GenericWindows11.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</telerik:RadWindow.Resources>
</telerik:RadWindow>
Switching the Windows 11 theme's color variation to a different one is not correctly applied with the Mica effect. This is present when the Windows 11 version is 22621.
A temporary resolution is to stop the Mica effect by setting the WindowEffectsHelper.BackdropMaterial property on the RadWindow to None.
<telerik:RadWindow x:Class="Example.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:helpers="clr-namespace:Telerik.Windows.Controls.Theming.Helpers;assembly=Telerik.Windows.Controls"
helpers:WindowEffectsHelper.BackdropMaterial="None"
Header="RadWindow">
An alternative approach would be to use DynamicResource when basing the custom style for the RadWindow on its default one. Also, when changing the color variation, the merged resource dictionaries could be cleared and then merged again. This way, the Mica effect will not have to be turned off.
<telerik:RadWindow xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation" x:Class="Example.MainWindow"
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:WindowWindows11ThemeTest"
mc:Ignorable="d"
Style="{DynamicResource RadWindowStyle}"
Header="MainWindow" Height="450" Width="800">
private bool isDarkPalette;
private void RadButton_Click(object sender, RoutedEventArgs e)
{
if (this.isDarkPalette)
{
Windows11Palette.LoadPreset(Windows11Palette.ColorVariation.System);
this.isDarkPalette = false;
}
else
{
Windows11Palette.LoadPreset(Windows11Palette.ColorVariation.Dark);
this.isDarkPalette = true;
}
this.MergeDictionaries();
}
private void MergeDictionaries()
{
Application.Current.Resources.MergedDictionaries.Clear();
Application.Current.Resources.MergedDictionaries.Add(new ResourceDictionary()
{
Source = new Uri("/Telerik.Windows.Themes.Windows11;component/Themes/System.Windows.xaml", UriKind.RelativeOrAbsolute)
});
Application.Current.Resources.MergedDictionaries.Add(new ResourceDictionary()
{
Source = new Uri("/Telerik.Windows.Themes.Windows11;component/Themes/Telerik.Windows.Controls.xaml", UriKind.RelativeOrAbsolute)
});
Application.Current.Resources.MergedDictionaries.Add(new ResourceDictionary()
{
Source = new Uri("/Telerik.Windows.Themes.Windows11;component/Themes/Telerik.Windows.Controls.Navigation.xaml", UriKind.RelativeOrAbsolute)
});
}
If the autohiding feature of the taskbar is enabled and RadWindow is maximized, the taskbar is not displayed when the mouse is over the bottom of the screen.
This is observed also in RadTabbedWindow.
Tested with 16.8.4 - works as expected. Updated to 16.9.0 to match the client's setup and managed to reproduce the issue. The issue is reproducible also with the 16.10.0 version of Visual Studio.
If you open the window on a specific resolution, maximize it and then change the resolution to a bigger one, the window size is not updated. The window stays in the original resolution of the screen.
To work this around subscribe to the SystemEvents.DisplaySettingsChanged event and reset the WindowState of RadWindow.
public MainWindow() // where MainWindow is RadWindow
{
InitializeComponent();
SystemEvents.DisplaySettingsChanged += SystemEvents_DisplaySettingsChanged;
}
private void SystemEvents_DisplaySettingsChanged(object sender, EventArgs e)
{
if (this.WindowState == WindowState.Maximized)
{
this.WindowState = WindowState.Normal;
this.WindowState = WindowState.Maximized;
}
}
Hi,
Please see attached project,
After use animation changed window size and use the mouse to drag to change the size of the window,
When the window size is smaller than the original size, the upper right button will be hide,
Original WPF Window no this problem, And changing size animation very Smooth then RadWIndow.
PreviewClosed event is called twice when using custom close button in DialogWindow