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# Objective Limited implementation of the CSS property `overflow-clip-margin` https://developer.mozilla.org/en-US/docs/Web/CSS/overflow-clip-margin Allows you to control the visible area for clipped content when using overfllow-clip, -hidden, or -scroll and expand it with a margin. Based on #15442 Fixes #15468 ## Solution Adds a new field to Style: `overflow_clip_margin: OverflowClipMargin`. The field is ignored unless overflow-clip, -hidden or -scroll is set on at least one axis. `OverflowClipMargin` has these associated constructor functions: ``` pub const fn content_box() -> Self; pub const fn padding_box() -> Self; pub const fn border_box() -> Self; ``` You can also use the method `with_margin` to increases the size of the visible area: ``` commands .spawn(NodeBundle { style: Style { width: Val::Px(100.), height: Val::Px(100.), padding: UiRect::all(Val::Px(20.)), border: UiRect::all(Val::Px(5.)), overflow: Overflow::clip(), overflow_clip_margin: OverflowClipMargin::border_box().with_margin(25.), ..Default::default() }, border_color: Color::BLACK.into(), background_color: GRAY.into(), ..Default::default() }) ``` `with_margin` expects a length in logical pixels, negative values are clamped to zero. ## Notes * To keep this PR as simple as possible I omitted responsive margin values support. This could be added in a follow up if we want it. * CSS also supports a `margin-box` option but we don't have access to the margin values in `Node` so it's probably not feasible to implement atm. ## Testing ```cargo run --example overflow_clip_margin``` <img width="396" alt="overflow-clip-margin" src="https://github.com/user-attachments/assets/07b51cd6-a565-4451-87a0-fa079429b04b"> ## Migration Guide Style has a new field `OverflowClipMargin`. It allows users to set the visible area for clipped content when using overflow-clip, -hidden, or -scroll and expand it with a margin. There are three associated constructor functions `content_box`, `padding_box` and `border_box`: * `content_box`: elements painted outside of the content box area (the innermost part of the node excluding the padding and border) of the node are clipped. This is the new default behaviour. * `padding_box`: elements painted outside outside of the padding area of the node are clipped. * `border_box`: elements painted outside of the bounds of the node are clipped. This matches the behaviour from Bevy 0.14. There is also a `with_margin` method that increases the size of the visible area by the given number in logical pixels, negative margin values are clamped to zero. `OverflowClipMargin` is ignored unless overflow-clip, -hidden or -scroll is also set on at least one axis of the UI node. --------- Co-authored-by: UkoeHB <37489173+UkoeHB@users.noreply.github.com> |
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Bevy UI
