Container queries

[danwalmsley]

What does the pull request do?

Prototype for implementation of css like media queries.

Essential to support multiple form factors.

What is the current behavior?

What is the updated/expected behavior with this PR?

How was the solution implemented (if it's not obvious)?

Checklist

• Added unit tests (if possible)?
• Added XML documentation to any related classes?
• Consider submitting a PR to https://github.com/AvaloniaUI/Documentation with user documentation

Breaking changes

Obsoletions / Deprecations

Fixed issues

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[robloo]

I certainly think this is useful in some cases. However, I'm a big fan of fully adaptive/responsive UI's that adjust based on resolution or orientation though. This type of functionality in my mind is needed for less-powerful UI frameworks. XAML is resolution independent, fully vector-based and composable. You can generally-speaking design a good UI that works everywhere and automatically adjusts itself.

[workgroupengineering]

It's a great addition, but I'd like to suggest an improvement

eg:

      <Style Selector=":min-width(600) TextBlock#MinWidth">
        <Setter Property="Foreground" Value="Red" />
      </Style>
      <Style Selector=":max-width(600) TextBox">
        <Setter Property="Foreground" Value="Red" />
      </Style>
      <Style Selector=":max-width(600) Rectangle">
        <Setter Property="Fill" Value="Red" />
      </Style>
      <Style Selector=":min-width(800) TextBlock#MinWidth">
        <Setter Property="Foreground" Value="Blue" />
      </Style>
      <Style Selector=":max-width(800) TextBox">
        <Setter Property="Foreground" Value="Blue" />
      </Style>
      <Style Selector=":max-width(800) Rectangle">
        <Setter Property="Fill" Value="Blue" />
      </Style>
      ....

will became:

       <Media Selector=":min-width(600)">
         <Style "TextBlock#MinWidth">
           <Setter Property="Foreground" Value="Red" />
         </Style>
         <Style Selector="TextBox">
           <Setter Property="Foreground" Value="Red" />
         </Style>
         <Style Selector=" Rectangle">
           <Setter Property="Fill" Value="Red" />
         </Style>
       </Media>
       <Media Selector=":min-width(800)">
         <Style Selector="TextBlock#MinWidth">
           <Setter Property="Foreground" Value="Blue" />
         </Style>
         <Style Selector="TextBox">
           <Setter Property="Foreground" Value="Blue" />
         </Style>
         <Style Selector="Rectangle">
            <Setter Property="Fill" Value="Blue" />
         </Style>
       </Media>
      ....

Other possible MediaSelector:

Selector	Description
resolution	select the style based on the DPI
media-type	select the style based on media type (screen,printer, ecc.)
orientation	The orientation of the viewport (landscape or portrait mode)
light-level	Current ambient light level (added in Media Queries Level 4)
aspectratio	The Current aspect ratio (4:3,16:9,...)

[Gillibald]

This should just work

      <Style Selector=":min-width(600)">
         <Style "TextBlock#MinWidth">
           <Setter Property="Foreground" Value="Red" />
         </Style>
         <Style Selector="TextBox">
           <Setter Property="Foreground" Value="Red" />
         </Style>
         <Style Selector=" Rectangle">
           <Setter Property="Fill" Value="Red" />
         </Style>
       </Style>
       <Style Selector=":min-width(800)">
         <Style Selector="TextBlock#MinWidth">
           <Setter Property="Foreground" Value="Blue" />
         </Style>
         <Style Selector="TextBox">
           <Setter Property="Foreground" Value="Blue" />
         </Style>
         <Style Selector="Rectangle">
            <Setter Property="Fill" Value="Blue" />
         </Style>
       </Style>

[MarchingCube]

I certainly think this is useful in some cases. However, I'm a big fan of fully adaptive/responsive UI's that adjust based on resolution or orientation though. This type of functionality in my mind is needed for less-powerful UI frameworks. XAML is resolution independent, fully vector-based and composable. You can generally-speaking design a good UI that works everywhere and automatically adjusts itself.

From my perspective it is quite hard to create truly responsive controls in pure XAML. For example TextBox that shows/hides extra buttons based on available space. So this media query setup could be quite useful to remove code and move such behavior to styles. This is still no as flexible as doing this in C# though since there visual tree can be patched easily to adapt control to given size constraint.

[robloo]

So this media query setup could be quite useful to remove code and move such behavior to styles. This is still no as flexible as doing this in C# though since there visual tree can be patched easily to adapt control to given size constraint.

Yea, this can certainly be useful and I'm not against it all. I guess my point was more it isnt a blocker for supporting multiple devices and form factors. I generally found that there was a solution by rethinking designs and your app at a fundamental level. XAML with minimal C# code-behind is already powerful enough to do everything needed.

A desktop XAML app was made to work with mobile with the thinking I'm describing here. The only layout changes were triggered based on orientation and pixel size of the window -- very simple and done in code behind. It turned out quite well.

That said, the examples above based on width/height are good ones. AdaptiveTriggers in UWP were useful in several cases. I'm sure I can find a use for this too.

[MarchingCube]

FYI: CSS spec for container queries: w3c/csswg-drafts#5796

[robloo]

I had another thought about this. It's common for many views to share the same trigger width/height in pixels when the layout should change. Is there any way to declare a resource for width/height and then use it in a selector (I know the answer to this is no...) but is it possible in the future? Should it be?

<Style Selector=":min-width({StaticResource MinWindowWidth})">

Doing this would greatly help updating many views that use this type of selector.

[maxkatz6]

With CSS syntax it's a bit of a pain. Yet another reason to split "selector" and "media-query" (as it is in CSS), so we will be able to write:

<Style MediaQuery="min-width(600) and pointer(mouse)" Selector="Border" />

as well as

<Style Selector="Border">
   <Style.MediaQuery>
       <AndMediaQuery>
           <!--  Any other non-bindable markup extension should work here without any problem -->
           <SizeMediaQuery MinWidth="{StaticResource MinWindowWidth}" />
           <PointerMediaQuery PointerType="Mouse" />
       </AndMediaQuery>
   </Style.MediaQuery>
</Style>

Which also can be extended with custom MediaQuery types (like it's possible with AdaptiveTriggers).

CSS seems to not support variables in media queries, but only environment variables (consts), see w3c/csswg-drafts#1693

[workgroupengineering]

Perhaps it is better to shift the conversation into a discussion so as not to dirty the PR.

With CSS syntax it's a bit of a pain. Yet another reason to split "selector" and "media-query" (as it is in CSS), so we will be able to write:

<Style MediaQuery="min-width(600) and pointer(mouse)" Selector="Border" />

as well as

<Style Selector="Border">
   <Style.MediaQuery>
       <AndMediaQuery>
           <!--  Any other non-bindable markup extension should work here without any problem -->
           <SizeMediaQuery MinWidth="{StaticResource MinWindowWidth}" />
           <PointerMediaQuery PointerType="Mouse" />
       </AndMediaQuery>
   </Style.MediaQuery>
</Style>

Which also can be extended with custom MediaQuery types (like it's possible with AdaptiveTriggers).

CSS seems to not support variables in media queries, but only environment variables (consts), see w3c/csswg-drafts#1693

I don't see the need to add a new attribute when it's really nothing more than a selector.
The change I would like to propose to you is to add Selector to StyleInclude. So you can use it like this:

   <StyleInclude Selector="max-width(600)" Source="avares://MyApp/Assets/screen_small.xaml"/>
   <StyleInclude Selector="max-width(1024)" Source="avares://MyApp/Assets/screen_medium.xaml"/>
   <StyleInclude Selector="min-width(1280)" Source="avares://MyApp/Assets/screen_high.xaml"/>

[danwalmsley]

JFYI: This is just an initial prototype of how to make the functionality work, and its expected that the final syntax of media queries would be seperated from selectors.

We have identified this is a 2-stage process.

1. implement the parsing and infrastructure / logic to implement queries themselves.
2. implement child styles

[workgroupengineering]

JFYI: This is just an initial prototype of how to make the functionality work, and its expected that the final syntax of media queries would be seperated from selectors.

Why this choice? I don't see any difference between MediaQuery and Selector, they both allow you to activate / deactivate a style based on a condition. Adding an extra attribute would increase cofusion.

<Style Selector="Border">
   <Style.MediaQuery>
       <AndMediaQuery>
           <!--  Any other non-bindable markup extension should work here without any problem -->
           <SizeMediaQuery MinWidth="{StaticResource MinWindowWidth}" />
           <PointerMediaQuery PointerType="Mouse" />
       </AndMediaQuery>
   </Style.MediaQuery>
</Style>

Greats idea of syntax could also be extended to selector. It would make the approach easier for those like me who do not have a web background and at the beginning find it difficult to read and write a Selector.

[maxkatz6]

Closing as inactive.
Just in case, it's still something we want one day. Potentially can be added in 11.x as it doesn't introduce breaking changes.

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[jmacato]

@emmauss any status updates for this?

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[maxkatz6]

Closing this PR as feature is getting reworked in #16846

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