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feat: implement nested border-box layout and alignment

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Codex Bot
2026-11-10 22:17:19 +08:00
parent 525097a0b2
commit 32d7ada3ab
21 changed files with 1368 additions and 74 deletions
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src/runtime/api/guide.rs
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@@ -142,6 +142,8 @@ ScrollBlock.axis is a managed visual attribute: "both" (default), "vertical" or
ContainerBlock.mainAlign accepts "start" (default), "center", "end" or "space-between". Native arrangement uses allocated Bounds after padding/minimum gap, distributes positive remaining main-axis space and keeps child sizes unchanged. Overflow keeps start placement. Explicit source arrange placements remain authoritative; this is alignment, not flex sizing.
Finite box layout: Overlay(padding, gap, children...) stacks children (gap is unused); mainAlign aligns horizontally and crossAlign vertically. Row/Column crossAlign accepts "start", "center", "end" or "stretch". Block.alignSelf defaults to "auto" and can override crossAlign per occurrence. marginTop/Right/Bottom/Left participate in measurement, alignment and flex allocation, without collapsing. paddingTop/Right/Bottom/Left override a side of the container padding; "auto" restores its fallback. borderTop/Right/Bottom/Left reserve inner border space; borderColor controls native border paint. Source paint overrides remain authoritative. boxWidth/boxHeight accept "auto", a nonnegative border-box dimension, or "fill" (finite parent required). Main-axis fill shares remaining space with weight 1 unless flex is set; minWidth/minHeight/maxWidth/maxHeight bound each dimension. Stretch changes only auto cross-axis dimensions. overflow is "visible" or "clip"; clipping affects descendant paint and hits. ScrollBlock handles scrolling independently of its content layout. See examples/box-layout.endor and docs/scene-architecture.md. Scene2D/CanvasViewport/Camera2D and Scene3D/Viewport3D are still pending; Page.mode remains a transitional API.
Block.flex is a nonnegative weight (default 0). Native containers reserve fixed measured children, padding and gaps, then share remaining allocated main-axis space between positive weights with zero basis. Actual child allocation feeds remeasurement. It does not request parent expansion. Further controls are described below.