Interface component telerik UI for WPF Getting Started Guide - how to switch custom styles using themes

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Theme with implicit styles , You can choose to change the theme of the control at run time , Without having to recreate UI.

The resources in the merge dictionary occupy a position in the resource lock range , This location is just after the scope of the main resource dictionary into which they are merged . What you can do is isolate the custom styles in a separate resource dictionary , And add them to the default dictionary every time you change topics .

for example , You can follow the steps below ：

1. Create a new application and start at Telerik UI for WPF In the installation folder Binaries.NoXaml Add the required assemblies and theme assemblies to the folder ：

• Telerik.Windows.Controls.dll
• Telerik.Windows.Controls.Input.dll
• Telerik.Windows.Themes.Office_Black.dll
• Telerik.Windows.Themes.Office2016.dll

2. stay App.xaml Add the corresponding resource dictionary for the default topic in ：

Example 1： Merge resource dictionaries

XAML

<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Telerik.Windows.Themes.Office_Black;component/Themes/System.Windows.xaml"/>
<ResourceDictionary Source="/Telerik.Windows.Themes.Office_Black;component/Themes/Telerik.Windows.Controls.xaml"/>
<ResourceDictionary Source="/Telerik.Windows.Themes.Office_Black;component/Themes/Telerik.Windows.Controls.Input.xaml"/>
<!-- ... -->
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>

Be careful ： first , We merged Office_Black Resource dictionary for topic .

3. Add some of the controls you select to the layout root directory of the application , There are also two buttons for switching between topics .

Example 2： Add buttons to switch between topics

XAML

<Grid x:Name="LayoutRoot" Background="White">
<Grid.RowDefinitions>
<RowDefinition Height="*"/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<telerik:RadButton Content="Button" VerticalAlignment="Center" Width="100"/>
<StackPanel Grid.Row="1" Orientation="Horizontal">
<Button x:Name="Office_Black" Margin="5" Content="Office__Black" Click="Office_Black_Click"/>
<Button x:Name="Office2016" Margin="5" Content="Office2016" Click="Office2016_Click"/>
</StackPanel>
</Grid>

4. Now? , Add a custom style to the project Themes Folder name CustomStyles_Office_Black.xaml and CustomStyles_Office2016.xaml Separate resource dictionaries for different topics , These custom resource dictionaries will have the following ：

Example 3： Add custom styles to a separate resource dictionary

XAML

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Style TargetType="telerik:RadButton" BasedOn="{StaticResource RadButtonStyle}">
<Setter Property="Background" Value="Black"/>
<Setter Property="Foreground" Value="White"/>
</Style>
</ResourceDictionary>

Be careful ： Creating separate resource dictionaries for different topics allows easy customization on a per topic basis , But you can use a single dictionary when switching topics and merge only this dictionary , If you don't have any theme specific changes . Such changes will include any modified space templates , Because these templates vary by topic , And it may cause errors during switching .

Example 4： Add dictionary to MergedDictionaries

XAML

<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="/Telerik.Windows.Themes.Office_Black;component/Themes/System.Windows.xaml"/>
<ResourceDictionary Source="/Telerik.Windows.Themes.Office_Black;component/Themes/Telerik.Windows.Controls.xaml"/>
<ResourceDictionary Source="/Telerik.Windows.Themes.Office_Black;component/Themes/Telerik.Windows.Controls.Input.xaml"/>
<!-- ... -->
<ResourceDictionary Source="/ProjectName;component/Themes/CustomStyles_Office_Black.xaml"/>
</ResourceDictionary.MergedDictionaries>

Please note that , You should ProjectName Replace with the actual name of the project .

6. then , At the button Click In process , We will clear the merged dictionary from the application resource , And merge the new resource dictionary in the topic assembly with the custom styles contained in the custom resource dictionary ：

Example 5： Clear and merge dictionaries when the button is clicked

C#

private void Office_Black_Click(object sender, RoutedEventArgs e)
{
this.MergeDictionaries("Office_Black");
}

private void Office2016_Click(object sender, RoutedEventArgs e)
{
this.MergeDictionaries("Office2016");
}

private void MergeDictionaries(string theme)
{
Application.Current.Resources.MergedDictionaries.Clear();
Application.Current.Resources.MergedDictionaries.Add(new ResourceDictionary()
{
Source = new Uri("/Telerik.Windows.Themes." + theme + ";component/Themes/System.Windows.xaml", UriKind.RelativeOrAbsolute)
});
Application.Current.Resources.MergedDictionaries.Add(new ResourceDictionary()
{
Source = new Uri("/Telerik.Windows.Themes." + theme + ";component/Themes/Telerik.Windows.Controls.xaml", UriKind.RelativeOrAbsolute)
});
Application.Current.Resources.MergedDictionaries.Add(new ResourceDictionary()
{
Source = new Uri("/Telerik.Windows.Themes." + theme + ";component/Themes/Telerik.Windows.Controls.Input.xaml", UriKind.RelativeOrAbsolute)
});
Application.Current.Resources.MergedDictionaries.Add(new ResourceDictionary()
{
Source = new Uri("/ProjectName;component/Themes/CustomStyles_" + theme + ".xaml", UriKind.RelativeOrAbsolute)
});
}

Please note that ,MergeDictionaries The topic provided in should match the name of the corresponding topic assembly , for example - Expression_Dark、Office2016Touch、Material. Using this method , You can switch to Telerik UI for WPF Any theme provided by the suite .

The result based on the above code is shown in Figure 1 Shown .

chart 1： with Office_Black and Office 2016 Topic radio buttons

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