TextBox Stylings when Focused - WinUI 3.0 - xaml

Question

Similar to UWP TextBox Background when Focused
I am attempting to set some application-wide style guides for Focused TextBox elements in my application. My problem is that I would like to apply different styling to any Focused PasswordBox Elements on my page, but this solution applies the same styling to PasswordBox & TextBox.
Is there a way to explicitly apply the x:Key directive for TextBox elements only?
I was thinking there might be a way to use XAML <Style TargetType="TextBox"> but can't figure it out.
<Application
x:Class="Aerloc_App.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:Aerloc_App">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
<!-- Other merged dictionaries here -->
</ResourceDictionary.MergedDictionaries>
<!-- Other app resources here -->
<SolidColorBrush x:Key="TextControlBackgroundFocused" Color="____"/>
<SolidColorBrush x:Key="TextControlForegroundFocused" Color="____"/>
<SolidColorBrush x:Key="TextControlBorderBrushFocused" Color="____" Opacity="1"/>
</ResourceDictionary>
</Application.Resources>
</Application>

Answer 1

You need to get the default style for the TextBox control and modify its Focused VisualState.
You can learn how to locate the generic.xaml file here.
I brought this style from my laptop generic.xaml but it should also work on yours.
<Application
x:Class="App1.App"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="using:App1">
<Application.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
<!-- Other merged dictionaries here -->
</ResourceDictionary.MergedDictionaries>
<!-- Other app resources here -->
<!-- YOUR CUSTOM COLORS -->
<SolidColorBrush x:Key="CustomTextControlBackgroundFocused" Color="HotPink" />
<SolidColorBrush x:Key="CustomTextControlForegroundFocused" Color="YellowGreen" />
<SolidColorBrush
x:Key="CustomTextControlBorderBrushFocused"
Opacity="1"
Color="SkyBlue" />
<!-- THIS IS FROM generic.xaml -->
<Style x:Key="CustomTextBox" TargetType="TextBox">
<Setter Property="Foreground" Value="{ThemeResource TextControlForeground}" />
<Setter Property="Background" Value="{ThemeResource TextControlBackground}" />
<Setter Property="BorderBrush" Value="{ThemeResource TextControlBorderBrush}" />
<Setter Property="SelectionHighlightColor" Value="{ThemeResource TextControlSelectionHighlightColor}" />
<Setter Property="BorderThickness" Value="{ThemeResource TextControlBorderThemeThickness}" />
<Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}" />
<Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}" />
<Setter Property="ScrollViewer.HorizontalScrollMode" Value="Auto" />
<Setter Property="ScrollViewer.VerticalScrollMode" Value="Auto" />
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Hidden" />
<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Hidden" />
<Setter Property="ScrollViewer.IsDeferredScrollingEnabled" Value="False" />
<Setter Property="Padding" Value="{ThemeResource TextControlThemePadding}" />
<Setter Property="UseSystemFocusVisuals" Value="{ThemeResource IsApplicationFocusVisualKindReveal}" />
<Setter Property="ContextFlyout" Value="{StaticResource TextControlCommandBarContextFlyout}" />
<Setter Property="SelectionFlyout" Value="{StaticResource TextControlCommandBarSelectionFlyout}" />
<!-- Please uncomment below line if you want to enable InputValidation APIs for TextBox/ PasswordBox in Pre-Release builds -->
<!-- <Setter Property="ErrorTemplate" Value="{StaticResource DefaultInputValidationErrorTemplate}" /> -->
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TextBox">
<Grid>
<Grid.Resources>
<Style x:Name="DeleteButtonStyle" TargetType="Button">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid
x:Name="ButtonLayoutGrid"
Background="{ThemeResource TextControlButtonBackground}"
BorderBrush="{ThemeResource TextControlButtonBorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}">
<TextBlock
x:Name="GlyphElement"
HorizontalAlignment="Center"
VerticalAlignment="Center"
AutomationProperties.AccessibilityView="Raw"
FontFamily="{ThemeResource SymbolThemeFontFamily}"
FontSize="12"
FontStyle="Normal"
Foreground="{ThemeResource TextControlButtonForeground}"
Text="" />
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="PointerOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ButtonLayoutGrid" Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlButtonBackgroundPointerOver}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ButtonLayoutGrid" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlButtonBorderBrushPointerOver}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="GlyphElement" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlButtonForegroundPointerOver}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ButtonLayoutGrid" Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlButtonBackgroundPressed}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ButtonLayoutGrid" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlButtonBorderBrushPressed}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="GlyphElement" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlButtonForegroundPressed}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="ButtonLayoutGrid"
Storyboard.TargetProperty="Opacity"
To="0"
Duration="0" />
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Grid.Resources>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="*" />
<RowDefinition Height="Auto" />
<RowDefinition
x:Name="ErrorPresenterRow"
Height="Auto"
MinHeight="0" />
</Grid.RowDefinitions>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition x:Name="ErrorIconColumn" MaxWidth="0" />
</Grid.ColumnDefinitions>
<ContentPresenter
x:Name="RequiredHeaderPresenter"
Grid.Column="0"
x:DeferLoadStrategy="Lazy"
AutomationProperties.AccessibilityView="Raw"
Content="{StaticResource RequiredHeaderContent}"
Foreground="{ThemeResource SystemControlErrorTextForegroundBrush}"
Visibility="Collapsed" />
<ContentPresenter
x:Name="HeaderContentPresenter"
Grid.Row="0"
Grid.Column="1"
Grid.ColumnSpan="2"
Margin="{ThemeResource TextBoxTopHeaderMargin}"
VerticalAlignment="Top"
x:DeferLoadStrategy="Lazy"
Content="{TemplateBinding Header}"
ContentTemplate="{TemplateBinding HeaderTemplate}"
FontWeight="Normal"
Foreground="{ThemeResource TextControlHeaderForeground}"
TextWrapping="Wrap"
Visibility="Collapsed" />
<Border
x:Name="BorderElement"
Grid.Row="1"
Grid.RowSpan="1"
Grid.Column="1"
Grid.ColumnSpan="2"
MinWidth="{ThemeResource TextControlThemeMinWidth}"
MinHeight="{ThemeResource TextControlThemeMinHeight}"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Control.IsTemplateFocusTarget="True"
CornerRadius="{TemplateBinding CornerRadius}" />
<ScrollViewer
x:Name="ContentElement"
Grid.Row="1"
Grid.Column="1"
Margin="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}"
AutomationProperties.AccessibilityView="Raw"
HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}"
HorizontalScrollMode="{TemplateBinding ScrollViewer.HorizontalScrollMode}"
IsDeferredScrollingEnabled="{TemplateBinding ScrollViewer.IsDeferredScrollingEnabled}"
IsHorizontalRailEnabled="{TemplateBinding ScrollViewer.IsHorizontalRailEnabled}"
IsTabStop="False"
IsVerticalRailEnabled="{TemplateBinding ScrollViewer.IsVerticalRailEnabled}"
VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}"
VerticalScrollMode="{TemplateBinding ScrollViewer.VerticalScrollMode}"
ZoomMode="Disabled" />
<TextBlock
x:Name="PlaceholderTextContentPresenter"
Grid.Row="1"
Grid.Column="1"
Grid.ColumnSpan="2"
Margin="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}"
Foreground="{Binding PlaceholderForeground, RelativeSource={RelativeSource TemplatedParent}, TargetNullValue={ThemeResource TextControlPlaceholderForeground}}"
IsHitTestVisible="False"
Text="{TemplateBinding PlaceholderText}"
TextAlignment="{TemplateBinding TextAlignment}"
TextWrapping="{TemplateBinding TextWrapping}" />
<Button
x:Name="DeleteButton"
Grid.Row="1"
Grid.Column="2"
MinWidth="34"
Margin="{ThemeResource HelperButtonThemePadding}"
VerticalAlignment="Stretch"
AutomationProperties.AccessibilityView="Raw"
BorderThickness="{TemplateBinding BorderThickness}"
FontSize="{TemplateBinding FontSize}"
IsTabStop="False"
Style="{StaticResource DeleteButtonStyle}"
Visibility="Collapsed" />
<ContentPresenter
x:Name="ErrorPresenter"
Grid.Row="1"
Grid.Column="3"
x:Load="False"
AutomationProperties.AccessibilityView="Raw"
Foreground="{ThemeResource SystemControlErrorTextForegroundBrush}" />
<ContentPresenter
x:Name="DescriptionPresenter"
Grid.Row="2"
Grid.Column="0"
Grid.ColumnSpan="2"
x:Load="False"
AutomationProperties.AccessibilityView="Raw"
Content="{TemplateBinding Description}"
Foreground="{ThemeResource SystemControlDescriptionTextForegroundBrush}" />
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="HeaderContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlHeaderForegroundDisabled}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement" Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlBackgroundDisabled}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlBorderBrushDisabled}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentElement" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlForegroundDisabled}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="PlaceholderTextContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{Binding PlaceholderForeground, RelativeSource={RelativeSource TemplatedParent}, TargetNullValue={ThemeResource TextControlPlaceholderForegroundDisabled}}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="PointerOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlBorderBrushPointerOver}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement" Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlBackgroundPointerOver}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="PlaceholderTextContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{Binding PlaceholderForeground, RelativeSource={RelativeSource TemplatedParent}, TargetNullValue={ThemeResource TextControlPlaceholderForegroundPointerOver}}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentElement" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource TextControlForegroundPointerOver}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<!-- THIS IS WHAT YOU WANT TO CUSTOMIZE -->
<VisualState x:Name="Focused">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="PlaceholderTextContentPresenter" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{Binding PlaceholderForeground, RelativeSource={RelativeSource TemplatedParent}, TargetNullValue={ThemeResource TextControlPlaceholderForegroundFocused}}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement" Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource CustomTextControlBackgroundFocused}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="BorderElement" Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource CustomTextControlBorderBrushFocused}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentElement" Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource CustomTextControlForegroundFocused}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentElement" Storyboard.TargetProperty="RequestedTheme">
<DiscreteObjectKeyFrame KeyTime="0" Value="Light" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="ButtonStates">
<VisualState x:Name="ButtonVisible">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="DeleteButton" Storyboard.TargetProperty="Visibility">
<DiscreteObjectKeyFrame KeyTime="0">
<DiscreteObjectKeyFrame.Value>
<Visibility>Visible</Visibility>
</DiscreteObjectKeyFrame.Value>
</DiscreteObjectKeyFrame>
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="ButtonCollapsed" />
</VisualStateGroup>
<VisualStateGroup x:Name="InputValidationEnabledStates">
<VisualState x:Name="CompactValidationEnabled" />
<VisualState x:Name="InlineValidationEnabled">
<VisualState.Setters>
<Setter Target="ErrorPresenterRow.MinHeight" Value="20" />
</VisualState.Setters>
</VisualState>
<VisualState x:Name="ValidationDisabled" />
</VisualStateGroup>
<VisualStateGroup x:Name="InputValidationErrorStates">
<VisualState x:Name="CompactErrors">
<VisualState.Setters>
<Setter Target="ErrorIconColumn.MaxWidth" Value="20" />
<Setter Target="ErrorPresenter.Visibility" Value="Visible" />
<Setter Target="BorderElement.BorderBrush" Value="{StaticResource SystemControlErrorTextForegroundBrush}" />
</VisualState.Setters>
</VisualState>
<VisualState x:Name="InlineErrors">
<VisualState.Setters>
<Setter Target="ErrorPresenter.(Grid.Row)" Value="2" />
<Setter Target="ErrorPresenter.(Grid.Column)" Value="2" />
<Setter Target="ErrorPresenter.(Grid.ColumnSpan)" Value="3" />
<Setter Target="DescriptionPresenter.Visibility" Value="Collapsed" />
<Setter Target="ErrorPresenter.Visibility" Value="Visible" />
<Setter Target="BorderElement.BorderBrush" Value="{StaticResource SystemControlErrorTextForegroundBrush}" />
</VisualState.Setters>
</VisualState>
<VisualState x:Name="ErrorsCleared" />
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
</Application.Resources>
</Application>
And you can use it like this.
<TextBox Style="{StaticResource CustomTextBox}"/>
<PasswordBox />