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Flex does not center the node and node does not respond to height change in window. #9841

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Hossein-Noroozpour opened this issue Sep 18, 2023 · 5 comments · Fixed by DioxusLabs/taffy#545
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Flex does not center the node and node does not respond to height change in window. #9841

Hossein-Noroozpour opened this issue Sep 18, 2023 · 5 comments · Fixed by DioxusLabs/taffy#545
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A-UI Graphical user interfaces, styles, layouts, and widgets C-Bug An unexpected or incorrect behavior

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@Hossein-Noroozpour
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In version "0.11.2"

I wanted to place an image in the centre and keep its height 100% of the window and width proportional to the height (keep the aspect)

This is the equivalent of flex in CSS.

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .image-container {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }

        .image {
            width: auto;
            height: 100%;
        }
    </style>
</head>
<body>
<div class="image-container">
    <img class="image" src="../assets/ui/main-menu.png" alt="Image">
</div>
</body>
</html>

but the behaviour in Bevy is different:

use bevy::prelude::*;

fn setup_camera(mut commands: Commands) {
    commands.spawn(Camera2dBundle::default());
}

fn setup_ui(mut commands: Commands, asset_server: Res<AssetServer>) {
    commands
        .spawn(NodeBundle {
            style: Style {
                height: Val::Vh(100.0),
                display: Display::Flex,
                align_items: AlignItems::Center,
                justify_content: JustifyContent::Center,
                ..default()
            },
            ..default()
        })
        .with_children(|parent| {
            parent.spawn(ImageBundle {
                style: Style {
                    height: Val::Percent(100.0),
                    width: Val::Auto,
                    ..default()
                },
                image: UiImage::new(asset_server.load("ui/main-menu.png")),
                ..default()
            });
        });
}

fn main() {
    App::new()
        .add_plugins(DefaultPlugins)
        .add_systems(Startup, setup_camera)
        .add_systems(Startup, setup_ui)
        .run();
}
@Hossein-Noroozpour Hossein-Noroozpour added C-Bug An unexpected or incorrect behavior S-Needs-Triage This issue needs to be labelled labels Sep 18, 2023
@alice-i-cecile alice-i-cecile added A-UI Graphical user interfaces, styles, layouts, and widgets and removed S-Needs-Triage This issue needs to be labelled labels Sep 18, 2023
@alice-i-cecile
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Can you reproduce this on this branch? #9637

@nicoburns
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nicoburns commented Sep 18, 2023 •
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I can reproduce this on top of #9637 (I have to add width: Val::Vw(100.0), to the outer node to account for the changes in #9637 and make the outer node fill the width of the screen).

Adding an explicit aspect_ratio: Some(1.0) style on the ImageBundle entity (replace 1.0 with the actual aspect ratio of your image) produces the behaviour which I believe you want / are expecting. But for some reason the image's inherent aspect ratio doesn't seem have any effect on it's final size/position.

@nicoburns
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nicoburns commented Sep 18, 2023 •
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Hmm... interestingly it also does seem to work if the parent node is Display::Grid (with justify_items: JustifyItems::Center, set). Possibly we ought to add some image-based tests to Taffy (gentests with a measure function that acts like an <img> element with regard to aspect-ratio).

This was referenced Oct 2, 2023
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@nicoburns
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This is indeed a Taffy bug. Fix incoming.

@nicoburns
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@Hossein-Noroozpour Taffy v0.3.14 has been released with a fix for this issue. You can get the fix by running cargo update.

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Pass cross-axis known_dimension when computing flex item min size nicoburns/taffy
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@nicoburns @alice-i-cecile @Hossein-Noroozpour