How to Conditional Format Checkboxes?

[BrennanCarte]

First time poster here. I'm working on an application that requires me to do conditional formatting on a bunch of elements. While I've had no problems with most elements, checkboxes elude me. I've got this general code structure below going pretty much everywhere:

                <CheckBox.Style>
                    <Style BasedOn="{StaticResource MahApps.Styles.CheckBox}" TargetType="CheckBox">
                        <Style.Triggers>
                            <DataTrigger Binding="{Binding ConditionalFormattingVariable}" Value="1">
                                <Setter Property="Background" Value="PaleVioletRed" />
                                <Setter Property="ToolTip" Value="A bad thing is happening, user needs to pay attention." />
                            </DataTrigger>
                            <!--Further DataTriggers Here-->
                        </Style.Triggers>
                    </Style>
                </CheckBox.Style>

This works on everything except checkboxes. The tooltip shows up, but I'm unable to get the coloring I want. I've read through Controls.CheckBox.xaml and I'm pretty certain the reason this isn't working is due to checkboxes all using MahApps brushes, but I can't figure out the correct way to override them. Can anyone point me in the right direction?

[punker76]

@BrennanCarte You can use the CheckBoxHelper to set several brushes.

Sample:

2024-06-25_16h53_48.mp4

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:mah="http://metro.mahapps.com/winfx/xaml/controls" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
   <Page.Resources>
      <ResourceDictionary>
         <ResourceDictionary.MergedDictionaries>
   <!-- MahApps.Metro resource dictionaries. Make sure that all file names are Case Sensitive! -->
            <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Controls.xaml"/>
            <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Fonts.xaml"/>
   <!-- Theme setting -->
            <ResourceDictionary Source="pack://application:,,,/MahApps.Metro;component/Styles/Themes/Light.Blue.xaml"/>
         </ResourceDictionary.MergedDictionaries>
      </ResourceDictionary>
   </Page.Resources>
   <Grid>
      <StackPanel HorizontalAlignment="Center" Orientation="Vertical">
         <CheckBox x:Name="ConditionalFormatting" Margin="2" Content="Click me...">
         </CheckBox>
         <CheckBox Margin="2" Content="Click and me...">
            <CheckBox.Style>
               <Style BasedOn="{StaticResource MahApps.Styles.CheckBox}" TargetType="CheckBox">
                  <Style.Triggers>
                     <DataTrigger Binding="{Binding ElementName=ConditionalFormatting, Path=IsChecked}" Value="true">
                        <Setter Property="mah:CheckBoxHelper.BackgroundChecked" Value="SlateBlue"/>
                        <Setter Property="mah:CheckBoxHelper.BackgroundCheckedDisabled" Value="SlateBlue"/>
                        <Setter Property="mah:CheckBoxHelper.BackgroundCheckedMouseOver" Value="SlateBlue"/>
                        <Setter Property="mah:CheckBoxHelper.BackgroundCheckedPressed" Value="SlateBlue"/>
                        <Setter Property="mah:CheckBoxHelper.ForegroundChecked" Value="White"/>
                        <Setter Property="mah:CheckBoxHelper.ForegroundCheckedDisabled" Value="White"/>
                        <Setter Property="mah:CheckBoxHelper.ForegroundCheckedMouseOver" Value="White"/>
                        <Setter Property="mah:CheckBoxHelper.ForegroundCheckedPressed" Value="White"/>
                        <Setter Property="mah:CheckBoxHelper.BackgroundIndeterminate" Value="{DynamicResource MahApps.Brushes.CheckBox.BackgroundIndeterminate}"/>
                        <Setter Property="mah:CheckBoxHelper.BackgroundIndeterminateDisabled" Value="{DynamicResource MahApps.Brushes.CheckBox.BackgroundIndeterminateDisabled}"/>
                        <Setter Property="mah:CheckBoxHelper.BackgroundIndeterminateMouseOver" Value="{DynamicResource MahApps.Brushes.CheckBox.BackgroundIndeterminateMouseOver}"/>
                        <Setter Property="mah:CheckBoxHelper.BackgroundIndeterminatePressed" Value="{DynamicResource MahApps.Brushes.CheckBox.BackgroundIndeterminatePressed}"/>
                        <Setter Property="mah:CheckBoxHelper.BackgroundUnchecked" Value="PaleVioletRed"/>
                        <Setter Property="mah:CheckBoxHelper.BackgroundUncheckedDisabled" Value="PaleVioletRed"/>
                        <Setter Property="mah:CheckBoxHelper.BackgroundUncheckedMouseOver" Value="PaleVioletRed"/>
                        <Setter Property="mah:CheckBoxHelper.BackgroundUncheckedPressed" Value="PaleVioletRed"/>
                        <Setter Property="ToolTip" Value="A bad thing is happening, user needs to pay attention."/>
                     </DataTrigger>
   <!--Further DataTriggers Here-->
                  </Style.Triggers>
               </Style>
            </CheckBox.Style>
         </CheckBox>
      </StackPanel>
   </Grid>
</Page>