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Combobox background not being applied in windows 8

由 雨燕双飞 提交于 2019-11-28 12:12:34

Well the ComboBox clickable area is actually a ToggleButton

and if you look at the Style for that ToggleButton in Windows-8, you see something like:

<ControlTemplate TargetType="{x:Type ToggleButton}">
  <Border x:Name="templateRoot"
          Background="{StaticResource ComboBox.Static.Background}"
          BorderBrush="{StaticResource ComboBox.Static.Border}"
          BorderThickness="{TemplateBinding BorderThickness}"
          SnapsToDevicePixels="true">
...

As you can see from above, Background used is not a {TemplateBinding Background} but {StaticResource ComboBox.Static.Background}. Hence why you see no effect when you set the Background property in Windows-8 for that ComboBox

If your looking to carry a Style across the different OS Versions(Without having to backtrack and keep checking if new versions screwed up your over-rides), simple rule is Create it yourself.

Create a Style and set it to be applied by TargetType and without a Key to get applied automatically. That way in any OS it's your Style that gets used and not the default underlying one.

This thus guarantees your code run's as you expect on every single OS. Base your Style on the default's of any OS and tweak it to your heart's content.

side-note:

From a usability POV giving the user a Windows-7 ComboBox in an app that run's on Windows-8 is not very nice(unless your entire app looks like a Windows-7 app which is even worse). Your expecting the user to get used to your app's Style's and forget what he's used to from every other app he uses in his OS that use default Styles based on OS. If you have specific reasons for doing so, go ahead but do consider the implications.

Just for example you stated the Windows-8 Style is something your not a fan of, well I'm the opposite. I actually do like the Windows-8 clean and simple look. No distractions to the UserExperience with flashing gradients and things that throw you off the content your putting in front of them. This is an argument that goes on forever. Just be warned abt what the end-user expects and thinks than just what you think is good while writing your program.

Update:

Firstly comment on the relevant answer please. Your answer and your comment update has no relation.

Ok and as for your question edit, what you tried has not worked in windows-8 because PresentationFramework.Aero.dll does not exist in Windows-8 which is what holds Aero.NormalColor.xaml. In Windows-8 your options are PresentationFramework.Aero2.dll which is default and PresentationFramework.AeroLite.dll which I think is used by Windows Server 2012(Not Sure)

Try to compile your program on Windows-8 and you'll see it does not even want to compile.

You'll have to explicitly add a reference to PresentationFramework.Aero and also PresentationUI(which i think is part of .net3) to your project.

Then you'll have to edit your Aero.NormalColor.xaml to something like:

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:theme="clr-namespace:Microsoft.Windows.Themes;assembly=PresentationFramework.Aero"
                    xmlns:ui="clr-namespace:System.Windows.Documents;assembly=PresentationUI">
...

^^ we explicitly state the assembly for Aero Theme. I don't use Windows-7 so Am not sure if that's all that's needed. but you can give that a try.

Try to compile your code in Windows-8 to make sure it will work fine on Windows-8

Jatin

Finally, after hours of frustration, I came accross an explanation post here. Scroll for the LONG ANSWER. It explains exactly the scenario I have been facing particularly Aero style not getting applied to my Combobox. The link explains very well why we need to add a BasedOn attribute to every element that we style if we dont want the default OS style being picked up. So adding this BasedOn for the Combobox got it working for me. 

<Style TargetType="{x:Type ComboBox}" BasedOn="{StaticResource {x:Type ComboBox}}">

Now the Aero theme style is used for the combobox. As @Viv pointed out it may also require copying of PresentationFramework.Aero.dll and PresentationUI.dll to the windows 8 machine as they are not supplied with the OS.

Thanks, Nirvan

I did a bit of a hack on the built-in template. Not the cleanest solution, but removes the headache of having to roll my own template. The code behind basically binds the built-in template border's properties with the combo box's properties.

<Style TargetType="ComboBox">
    <Setter Property="Border.Background" Value="White"/>
    <EventSetter Event="Loaded" Handler="ComboBox_Loaded"/>
    <Style.Triggers>
        <Trigger Property="IsReadOnly" Value="True">
            <Setter Property="Background" Value="Transparent"/>
            <Setter Property="BorderBrush" Value="Transparent"/>
        </Trigger>
        <Trigger Property="IsFocused" Value="True">
            <Setter Property="Background" Value="{StaticResource ResourceKey=FocusedControlBackcolorBrush}"/>
            <Setter Property="BorderBrush" Value="{StaticResource ResourceKey=FocusedControlBorderBrush}"/>
        </Trigger>
        <Trigger Property="IsMouseOver" Value="True">
            <Setter Property="BorderBrush" Value="{StaticResource ResourceKey=FocusedControlBorderBrush}"/>
        </Trigger>
    </Style.Triggers>
</Style>


    private void ComboBox_Loaded(object sender, RoutedEventArgs e)
    {
        var comboBox = sender as ComboBox;
        var toggleButton = comboBox.Template?.FindName("toggleButton", comboBox) as ToggleButton;
        var border = toggleButton?.Template.FindName("templateRoot", toggleButton) as Border;
        if (border != null)
        {
            Binding b = new Binding("Background");
            b.RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor, typeof(ComboBox), 1);
            BindingOperations.SetBinding(border, Control.BackgroundProperty, b);

            b = new Binding("BorderBrush");
            b.RelativeSource = new RelativeSource(RelativeSourceMode.FindAncestor, typeof(ComboBox), 1);
            BindingOperations.SetBinding(border, Control.BorderBrushProperty, b);
        }
    }

In Response to @Viv

@Viv, I feel that your answer was very clear, but somehow your views/suggestions aren't digestable to me and I will briefly mention why

Your Suggestion

If your looking to carry a Style across the different OS Versions(Without having to backtrack and keep checking if new versions screwed up your over-rides), simple rule is Create it yourself.

It seems impracticable. The very idea of themes is creation of consistent look for all elements in the application and accross all platforms. So, if I use a particular theme provided by the framework, no matter what, I should be able to achieve a satisfactory level of consistency, atleast on major current platforms. Above all, not every one has the expertise to create all the styles and templates from scratch. The concept of themes should be,

"The framework provider is providing the themes that will work well for normal scenarios and if anyone wishing to roll out his themes he is welcome to do so".

Instead here the concept seems like

"The framework provider is providing theme and it is not guranted that it will be consistent and work without breaking. So always roll out your themes"

Your quote

As you can see from above, Background used is not a {TemplateBinding Background} but {StaticResource ComboBox.Static.Background}. Hence why you see no effect when you set the Background property in Windows-8 for that ComboBox

I don't know whose idea it was to make a template that way! Must be out of his minds or I am too dumb to understand the advantages. Just imagine that I am using some Blue colored theme in my application and tommorrow, on Windows 9, somebody defines a Red as {StaticResource ComboBox.Static.Background}. So, guess what, I have a fancy window screen now with all my elements themed "Blue" and only the combobox's appear "Red". I mean the very idea of theme is broken here!

Your side note

Just for example you stated the Windows-8 Style is something your not a fan of, well I'm the opposite. I actually do like the Windows-8 clean and simple look.

My combobox looks like a disabled button and I couldn't even change its background! The buttons don't look like they are clickable! Any way as you said this is a personal choice, ofcourse.

My Conclusion I will wait for some time if some one has any suggestions on how I get the combobox working on windows 8. Your answer brings forward the truth, so I would be happy to mark it a correct if I don't get any alternative solution.

Nirvan

The newer template has a Grid->ToggleButton->Border with a hardcoded background colour which does not respect any background styles. Based on the answer from @Matstar I made a way to sync the background colour across.

You can still set the binding to background colour and the code will pick this up and reapply this when needed:

<ComboBox ItemsSource="{Binding Values}" x:Name="Cbo2"
Background="{Binding Path=SelectedValueBgColor}" ... />

Then in xaml.cs

cbo.Loaded += (sender, args) =>
{
    var comboBox = sender as ComboBox;
    if (comboBox != null)
    {
        var toggleButton = comboBox.Template?.FindName("toggleButton", comboBox) as ToggleButton;
        var border = toggleButton?.Template.FindName("templateRoot", toggleButton) as Border;
        if (border != null)
        {
            var existing = BindingOperations.GetBinding(comboBox, BackgroundProperty);
            BindingOperations.SetBinding(border, BackgroundProperty, existing);
        }
    }
};

Make sure your background binding never returns null

If you have no meaningful value return transparent or white or some other default. If binding to a background that returns null the combobox will stop working.

Make sure you notify property changed on your background binding if it needs refreshing when an event happens.

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wpf
themes
wpf-4.0
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