How to change TextBox placeholder text color for a specific element, not global
Assuming you are using MSDN Textbox Style
Resource
Remove Foreground Property from Contencontrol in Template<ContentControl Foreground="{ThemeResource TextBoxPlaceholderTextThemeBrush}"/>
<Page.Resources>
<!--From MSDN : Default style for Windows.UI.Xaml.Controls.TextBox -->
<Style x:Key="MsdnTextboxStyle" TargetType="TextBox">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TextBox">
.....
.....
<ContentControl x:Name="PlaceholderTextContentPresenter"
Grid.Row="1"
Margin="{TemplateBinding BorderThickness}"
Padding="{TemplateBinding Padding}"
IsTabStop="False"
Grid.ColumnSpan="2"
Content="{TemplateBinding PlaceholderText}"
IsHitTestVisible="False"/>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Page.Resources>
Xaml
<StackPanel Orientation="Horizontal">
<TextBox PlaceholderText="PlaceholderText here..." Style="{StaticResource MsdnTextboxStyle}" Margin="20" Foreground="Red" Height="30" Width="120">
<TextBox.Resources>
<Style TargetType="ContentControl">
<Setter Property="Foreground" Value="Green"/>
</Style>
</TextBox.Resources>
</TextBox>
<TextBox PlaceholderText="PlaceholderText here..." Style="{StaticResource MsdnTextboxStyle}" Margin="20" Foreground="Red" Height="30" Width="120">
<TextBox.Resources>
<Style TargetType="ContentControl">
<Setter Property="Foreground" Value="Red"/>
</Style>
</TextBox.Resources>
</TextBox>
<TextBox PlaceholderText="PlaceholderText here..." Style="{StaticResource MsdnTextboxStyle}" Margin="20" Foreground="Red" Height="30" Width="120">
<TextBox.Resources>
<Style TargetType="ContentControl">
<Setter Property="Foreground" Value="Blue"/>
</Style>
</TextBox.Resources>
</TextBox>
</StackPanel>
Update
Resource
Remove Foreground Property from Contencontrol in Template<ContentControl Foreground="{ThemeResource TextBoxPlaceholderTextThemeBrush}"/>
<Page.Resources>
<ResourceDictionary>
<ResourceDictionary.ThemeDictionaries>
<ResourceDictionary x:Key="Default">
<SolidColorBrush x:Key="ContentControlForeGround" Color="Red"></SolidColorBrush>
<SolidColorBrush x:Key="ContentControlForeGround1" Color="Yellow"></SolidColorBrush>
</ResourceDictionary>
<ResourceDictionary x:Key="Light">
<SolidColorBrush x:Key="ContentControlForeGround" Color="Blue"></SolidColorBrush>
<SolidColorBrush x:Key="ContentControlForeGround1" Color="SkyBlue"></SolidColorBrush>
</ResourceDictionary>
<ResourceDictionary x:Key="Dark">
<SolidColorBrush x:Key="ContentControlForeGround" Color="Green"></SolidColorBrush>
<SolidColorBrush x:Key="ContentControlForeGround1" Color="Chocolate"></SolidColorBrush>
</ResourceDictionary>
</ResourceDictionary.ThemeDictionaries>
<Style x:Key="TextBoxStyle1" TargetType="TextBox">
.....
<ContentControl x:Name="PlaceholderTextContentPresenter" Grid.ColumnSpan="2" Content="{TemplateBinding PlaceholderText}" IsHitTestVisible="False" IsTabStop="False" Margin="{TemplateBinding BorderThickness}" Padding="{TemplateBinding Padding}" Grid.Row="1"/>
......
</Style>
</ResourceDictionary>
</Page.Resources>
xaml
<StackPanel Orientation="Horizontal">
<TextBox Style="{StaticResource TextBoxStyle1}" PlaceholderText="PlaceholderText here..." Margin="20" Foreground="Red" Height="30" Width="170">
<TextBox.Resources>
<Style TargetType="ContentControl">
<Setter Property="Foreground" Value="{StaticResource ContentControlForeGround}"></Setter>
</Style>
</TextBox.Resources>
</TextBox>
<TextBox Style="{StaticResource TextBoxStyle1}" PlaceholderText="PlaceholderText here..." Margin="20" Foreground="Red" Height="30" Width="170">
<TextBox.Resources>
<Style TargetType="ContentControl">
<Setter Property="Foreground" Value="{StaticResource ContentControlForeGround1}"></Setter>
</Style>
</TextBox.Resources>
</TextBox>
</StackPanel>
Decade Moon
Updated on July 03, 2022Comments
-
Decade Moon almost 2 years
MSDN lists the styles and templates for the
TextBox
class here. I can override these theme resources by creating aResourceDictionary
inApp.xaml
like this:<Application.Resources> <ResourceDictionary> <ResourceDictionary.ThemeDictionaries> <ResourceDictionary x:Key="Default"> <SolidColorBrush x:Key="TextBoxPlaceholderTextThemeBrush" Color="Yellow"/> </ResourceDictionary> </ResourceDictionary.ThemeDictionaries> </ResourceDictionary> </Application.Resources>
but this will affect every
TextBox
in my app. How can I set this theme for only a specific element?I've tried putting this dictionary in
Page.Resources
and evenTextBox.Resources
for theTextBox
that I want to apply it to, but it doesn't work.I really don't want to have to redefine the
Template
just to change this property.
EDIT Heena's answer is close, but I would also like to set different colors for light and dark themes because my textbox has a transparent background color.
I managed to achieve this by keeping
Foreground="{ThemeResource TextBoxPlaceholderTextThemeBrush}"
as part of theTemplate
(so, in other words, the template is exactly the default as per MSDN) and then specifying in the page resources:<Page.Resources> <ResourceDictionary.ThemeDictionaries> <ResourceDictionary x:Key="Light"> <SolidColorBrush x:Key="TextBoxPlaceholderTextThemeBrush" Color="Blue"/> </ResourceDictionary> ... </ResourceDictionary.ThemeDictionaries> </Page.Resources>
but this now means I have to put a huge
ControlTemplate
style-setter for the textbox in my page resources too, which is just an exact duplicate of the default anyway!Does this have something to do with how
TextBoxPlaceholderTextThemeBrush
is resolved from within theControlTemplate
? i.e. the reason why it discovers my custom theme dictionary is because theControlTemplate
was defined in the same resource dictionary?How is this supposed to be done? Should I just subclass the textbox so that all that XAML can be moved to another file (even if it is just for one textbox)?