WPF Change fontSize of button with style fails? - wpf

Question

Well i have my file Styles.xaml thats merged in the Application.xaml so it applies to every thing..
here are my styles
<Style TargetType="{x:Type Control}" x:Key="baseStyle">
<Setter Property="FontFamily" Value="Verdana"/>
<Setter Property="FontSize" Value="12"/>
</Style>
<Style TargetType="Button" BasedOn="{StaticResource baseStyle}">
<Setter Property="Margin" Value="2,0,2,0"/>
<Setter Property="Padding" Value="2"/>
<Setter Property="FontSize" Value="50"/>
</Style>
<Style TargetType="TextBlock">
<Setter Property="FontFamily" Value="Verdana"/>
<Setter Property="FontSize" Value="12"/>
</Style>
When im in the editor this seems to work but when i run the application the font-size of the buttons are shrinked to their normal sizes..
My guess is that the buttons create a TextBlock when their content is set to a string and then use the textblock style.. but how can i override this?

Answer 1

You're right about
My guess is that the buttons create a
TextBlock when their content is set to
a string and then use the textblock
style
. See this post.
A workaround is to define a
DataTemplate for System.String, where
we can explicitly use a default
TextBlock to display the content. You
can place that DataTemplate in the
same dictionary you define the
TextBlock style so that this
DataTemplate will be applied to
whatever ContentPresenter effected by
your style.
So adding the DataTemplate at the end to Styles.xaml will fix the problem
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:sys="clr-namespace:System;assembly=mscorlib">
<Style TargetType="{x:Type Control}" x:Key="baseStyle">
<Setter Property="FontFamily" Value="Verdana"/>
<Setter Property="FontSize" Value="12"/>
</Style>
<Style TargetType="{x:Type Button}" BasedOn="{StaticResource baseStyle}">
<Setter Property="Margin" Value="2,0,2,0"/>
<Setter Property="Padding" Value="2"/>
<Setter Property="Foreground" Value="Red" />
<Setter Property="FontSize" Value="50"/>
</Style>
<Style TargetType="{x:Type TextBlock}">
<Setter Property="FontFamily" Value="Verdana"/>
<Setter Property="Foreground" Value="Green" />
<Setter Property="FontSize" Value="24"/>
</Style>
<DataTemplate DataType="{x:Type sys:String}">
<TextBlock Text="{Binding}">
<TextBlock.Resources>
<Style TargetType="{x:Type TextBlock}"/>
</TextBlock.Resources>
</TextBlock>
</DataTemplate>
</ResourceDictionary>
This will keep your Style for a TextBlock but the TextBlock created in a Button for example won't be effected by it

Answer 2

I tried your styles, and it works well. So your styles are not the problem. I think it's the place you merged the style as you wrote. You'd better put your ResourceDictionary Styles.xaml in your MainWindow file instead of your Application.xaml.
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Window.Resources>
<ResourceDictionary>
<ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Styles.xaml" />
</ResourceDictionary.MergedDictionaries>
</ResourceDictionary>
</Window.Resources>
<StackPanel>
<TextBlock>TTT</TextBlock>
<Button>BBB</Button>
</StackPanel>
</Window>
But your problem remains unclear, if it's not the solution could you clarify a bit more the way you use your styles by posting this part of your code?