I my WPF application I'd like to change the text color by setting Foreground on the main Window like
<Window Foreground="Red">
<TextBlock Text="Hello World" />
</Window>
This works fine for TextBlocks, but if I add a Button, the font there stays black, since Button has a Setter for Foreground in its default style. can I make a new default style for Button based on the original one, but removing the Foregound setter?
I haven't tested this, but you could try using a base style in an appropriate resource collection (e.g. at the application level in App.xaml), and then create an implicit style for each type of control based on this base style.
<Style TargetType="{x:Type Control}" x:Key="DefaultControlStyle">
<Setter Property="Foreground" Value="Red" />
</Style>
<Style TargetType="{x:Type Button}" BasedOn="{StaticResource DefaultControlStyle}" />
<Style TargetType="{x:Type Label}" BasedOn="{StaticResource DefaultControlStyle}" />
<Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource DefaultControlStyle}" />
<Style TargetType="{x:Type ListView}" BasedOn="{StaticResource DefaultControlStyle}" />
You could also use a relative source binding trick described here.
Related
When I added style to AutoSuggestBox Query Icon disappears. Any solutions?
<Page.Resources>
<Style x:Key="AutoSuggestBoxStyle" TargetType="AutoSuggestBox">
<Setter Property="TextBoxStyle">
<Setter.Value>
<Style TargetType="TextBox">
<Setter Property="FontSize" Value="20"/>
</Style>
</Setter.Value>
</Setter>
</Style>
</Page.Resources>
Page Resources Style
<AutoSuggestBox
x:Name="autoSuggestBox"
Height="40"
Margin="24,44,24,0"
Text=""
PlaceholderText="Wyszukaj serial..."
QuerySubmitted="autoSuggestBox_QuerySubmitted"
SuggestionChosen="autoSuggestBox_SuggestionChosen"
TextChanged="autoSuggestBox_TextChanged"
QueryIcon="Find"
Style="{StaticResource AutoSuggestBoxStyle}"/>
XML AutoSuggestBox
Here is a better way.
You can define another TextBox style which is based on the existing style AutoSuggestBoxTextBoxStyle.
So you simply put the following into your resource dictionary.
<Style x:Key="BigAutoSuggestBoxTextBoxStyle"
TargetType="TextBox"
BasedOn="{StaticResource AutoSuggestBoxTextBoxStyle}">
<Setter Property="FontSize" Value="20" />
</Style>
Then, just reference it on your AutoSuggestBox.
<AutoSuggestBox QueryIcon="Find"
TextBoxStyle="{StaticResource BigAutoSuggestBoxTextBoxStyle}" />
Ok, I have a solution:
1) First I edited template copy, after PPM in design mode on AutoSuggestBox
2) Then I set FontSize in Resources.
I am using MahApps and working on implementing validation for TextBoxes. MahApps provides some nice properties in TextBoxes, as Controls:TextBoxHelper.Watermark and Controls:TextBoxHelper.ClearTextButton. I am writing an ErrorTemplate using my style but I overwrite the default template of the TextBox and lose those Metro properties. How can I achieve my goal without losing the template:
<Style TargetType="TextBox">
<Setter Property="Validation.ErrorTemplate" Value="{DynamicResource ErrorToolTipTemplate}" />
<Style.Triggers>
<Trigger Property="Validation.HasError" Value="true">
<Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}" />
</Trigger>
</Style.Triggers>
</Style>
You should define your new style based on existing to keep everything it has. I guess in case of MahApps it will be MetroTextBox:
<Style TargetType="TextBox" BasedOn="{StaticResource MetroTextBox}">
<!-- your properties go here -->
</Style>
The BasedOn is the key to success. However, it's likely, that you're using MahApps controls not in just one place. Therefore, try to make your style more generic and avoid direct references to MetroTextBox resource in the BasedOn.
The more good looking XAML style would be like that:
<Style TargetType="{x:Type TextBox}" BasedOn="{StaticResource {x:Type TextBox}}">
<!-- your properties go here -->
</Style>
I am trying to create a new style based on an existing style 'SubheaderTextBlockStyle'.
I did:
<Style x:Key="HeaderTextBlockStyle" TargetType="TextBlock" BasedOn="{StaticResource SubheaderTextBlockStyle}">
But It can't compile, I get message saying 'Style BasedOn property must be a Style, not 'ThemeResourceExtension' object.
How to get around that problem?
SubheaderTextBlockStyle is a WP8.1 runtime thing.
This works for me using the WP8.1 RT template. Where are you defining your <Style>?
<Page.Resources>
<Style x:Key="HeaderTextBlockStyle" TargetType="TextBlock" BasedOn="{StaticResource SubheaderTextBlockStyle}">
<Setter Property="FontSize" Value="50"/>
</Style>
</Page.Resources>
<Grid>
<TextBlock Text="TEST" Style="{StaticResource HeaderTextBlockStyle}"></TextBlock>
</Grid>
I've got a UserControl that contains a button:
<Button Content="Button"/>
And a style:
<Style TargetType="Button">
<Setter Property="Background" Value="Blue"/>
</Style>
The parent window (or another UserControl) may set another more general style:
<Style TargetType="Button">
<Setter Property="Background" Value="Red"/>
</Style>
The result is (what is obvious) that parent buttons will have more general style (Red) and my user control will have buttons with more specific style (Blue).
I'm wondering how to invert such behaviour in order to achieve something like setting the default style in my custom user control which could be then overriden in parent control or window if necessary?
The key is, that default style is defined first in custom user control and it is overriden automaticly by its parent. That is way I called it an inversion.
The imaginary example of the solution maight look like the following:
<Style TargetType="Button" StylePriority="Default">
<Setter Property="Background" Value="Blue"/>
</Style>
The StylePriority could indicate that if there is no other style defined for that button, then the default style should be applied to it.
You could use dynamic resources.
A UserControl:
<UserControl x:Class="Example.UserControl1"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Example">
<UserControl.Resources>
<Style TargetType="local:UserControl1">
<Style.Resources>
<Style TargetType="Button" x:Key="UserControl1.DefaultButtonStyle">
<Setter Property="Background" Value="Red"/>
</Style>
</Style.Resources>
</Style>
</UserControl.Resources>
<Button Content="UserControlButton" Style="{DynamicResource UserControl1.DefaultButtonStyle}"/>
</UserControl>
And a Window:
<Window x:Class="Example.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:Example">
<Window.Resources>
<Style TargetType="Button">
<Setter Property="Background" Value="Blue" />
</Style>
</Window.Resources>
<StackPanel>
<local:UserControl1 >
<local:UserControl1.Resources>
<Style x:Key="UserControl1.DefaultButtonStyle" TargetType="Button"
BasedOn="{StaticResource {x:Type Button}}">
<Setter Property="FontSize" Value="40" />
</Style>
</local:UserControl1.Resources>
</local:UserControl1>
<Button Content="WindowButton" />
</StackPanel>
</Window>
If you remove the style for the control in the window, the default user control button style will be applied.
Create a dependency property in your UserControl for the buttons colour, and then bind to it. You can specify a default value of blue for that property.
public static readonly DependencyProperty ButtonColorProperty =
DependencyProperty.Register("ButtonColor", typeof(Color), typeof(MyUserControl),
new PropertyMetadata(Colors.Blue));
public Color State
{
get { return (Color)this.GetValue(ButtonColorProperty); }
set { this.SetValue(ButtonColorProperty, value); }
}
<UserControl ...
x:Name="root">
<Button Content="Button" Background="{Binding ElementName=root, Path=ButtonColor}" />
</UserControl>
Then set that property to red where you want to use the UserControl.
<local:MyUserControl ButtonColor="Red" />
Problem
I've created a custom control (OmniBox), which has its base style set with:
<Style x:Key="GridStyle" TargetType="Grid" BasedOn="{StaticResource BaseElement}">
<Setter Property="Margin" Value="0,2" />
</Style>
But when I'm using my control, I want to be able to do something like:
<UserControl.Resources>
<Style TargetType="{x:Type ui:OmniBox}">
<Setter Property="HorizontalAlignment" Value="Stretch"/>
<Setter Property="Margin" Value="0,10"/> <!--Not Working?-->
</Style>
</UserControl.Resources>
<Grid>
<StackPanel>
<ui:OmniBox x:Name="One"... />
<ui:OmniBox x:Name="Two"... />
...
And have all instances of my control take on that default margin. Unfortunately, my controls are not responding to the style set in the resources. They are just keeping their default margin of "0,2".
Strangely, if I explicitly set the margin on my controls like so:
<ui:OmniBox x:Name="One" Margin="0,10" Style="OBDefaultStyle" ... />
<ui:OmniBox x:Name="Two" Margin="0,10" ... />
...
They DO use the margin of "0,10" rather than "0,2". How come the template type isn't working?
If it's relevant, my OmniBox control templates all look like this:
<Style TargetType="{x:Type local:OmniBox}" x:Key="OBDefaultStyle">
<Setter Property="Template" Value="{StaticResource OBDefaultTemplate}" />
</Style>
<ControlTemplate TargetType="{x:Type local:OmniBox}" x:Key="OBDefaultTemplate">
<Grid x:Name="PART_Grid" Style="{StaticResource GridStyle}">
... (Content)
</Grid>
</ControlTemplate>
First Attempt
In my grid style, I've tried setting Margin to
<Setter Property="Margin"
Value="{Binding Path=Margin, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type local:OmniBox}}}" />
But it didn't help in sucking down the templated margin.
Second Attempt
I tried creating a custom margin dependency property and binding the grid to that:
<Style x:Key="GridStyle" TargetType="Grid" BasedOn="{StaticResource BaseElement}">
<Setter Property="Margin" Value="{Binding Path=MyMargin, RelativeSource={RelativeSource TemplatedParent}}" />
</Style>
My custom property was defined as:
public static readonly DependencyProperty MarginProperty = DependencyProperty.Register("Margin", typeof(Thickness), typeof(OmniBox), new FrameworkPropertyMetadata(new Thickness(0,2,0,2), new PropertyChangedCallback(OnMarginChanged)));
Anyways it didn't work. The default margin set in the dependency property above is still overriding the margin I'm trying to set in the style template.
You can add a default style for a custom control by overriding the metadata for the DefaultStyleKey:
public class MyButton : Button
{
static MyButton()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(MyButton), new FrameworkPropertyMetadata(typeof(MyButton)));
}
}
You then create a resource dictionary called Generic.xaml that is located in a directory called Themes in the root of the project (so the path will be "/Themes/Generic.xaml"). In that resource dictionary you create a default style for your control:
<!-- Base the style on the default style of the base class, if you don't want to completely
replace that style. If you do, remember to specify a new control template in your style as well -->
<Style TargetType="SomeNamespace:MyButton" BasedOn="{StaticResource {x:Type Button}}">
<Setter Property="Margin" Value="10" />
</Style>
If you just add a MyButton control it will get the default style, but you can override properties set in the default style by applying a new style:
<Window x:Class="SomeNamespace.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:SomeNamespace="clr-namespace:SomeNamespace"
Title="MainWindow" Height="350" Width="525">
<Window.Resources>
<Style TargetType="SomeNamespace:MyButton">
<Setter Property="Margin" Value="20" />
</Style>
</Window.Resources>
<Grid>
<SomeNamespace:MyButton />
</Grid>
</Window>
GridStyle specifies TargetType="Grid", so the setter <Setter Property="Margin" Value="0,2" /> applies to the Grid at the root of the control template. Setting the Margin property of the containing OmniBox has no effect of the margin of that grid.
Try specifying this in the template:
<Grid x:Name="PART_Grid" Margin="{TemplateBinding Margin}">
Notice I did not set the Style property as you did in the template. This is because the grid's Margin property will always reflect the Margin property of the OmniBox containing it, negating the effect of the Margin property in GridStyle. Instead you will want to default the OmniBox.Margin property and remove GridStyle entirely:
<Style TargetType="{x:Type local:OmniBox}" x:Key="OBDefaultStyle">
<Setter Property="Margin" Value="0 2" />
<Setter Property="Template" Value="{StaticResource OBDefaultTemplate}" />
</Style>
Have you overridden the DefaultStyleKey property in your OmniBox control?
After happening on this question, I figured out what I needed to do. In the control's class, I need to override the margin property's default value:
static OmniBox()
{
MarginProperty.OverrideMetadata(typeof(OmniBox), new FrameworkPropertyMetadata(new Thickness(0,2,0,2)));
}
After that, I get rid of the margin on the "Grid" component of the omnibox completely, since the control itself carries a margin. Now when the user sets the "Margin" property on the OmniBox, it accepts it, if they don't, it uses the default value.
Thank you all so much for your suggestions and effort.