Crate frust_core 

Layer 1+2 of Frust: the declarative view API, the retained widget tree, box-constraint layout, and the rebuild/layout/paint pass skeleton. Modelled on xilem/Masonry, depending on neither, with no unsafe.

• anim — the frame clock, curves, tweens, springs and animation controllers.
• app — the RenderRoot each platform shell drives through rebuild, layout and paint.
• component — Component, a subtree with retained local state and its own Owner.
• event — input events and the EventCtx handlers mutate state through.
• hotpatch (feature hotpatch) — the hot-patch seam every Component::build runs through.
• hit — hit tests for content drawn under an arbitrary kurbo::Affine.
• input — slop/wheel constants, VelocityTracker and fling-decay math.
• insets — the WindowInsets safe-area and keyboard inset model.
• layout — the BoxConstraints box model.
• overlay — the portal a widget floats a pod above the whole app through.
• retained — retained-page keys and the renderer’s resident-key ledger.
• selection_toolbar — a text field’s toolbar request and the policy/builder slots.
• semantics — the accessibility tree pass behind SemanticsUpdate.
• shortcuts — the Chord spec and the per-paint keyboard-shortcut declarations.
• sliver — the sliver protocol a scrolling viewport lays children out with.
• tree — the WidgetTree arena and the read-only InspectNode walk.
• view — the View trait, ChangeFlags, BuildCtx and ViewSeq.
• widget — the Widget trait, its contexts, PaintScene and ChildPod.

Re-exports

pub use anim::AnimationController;

pub use anim::AnimationStatus;

pub use anim::Curve;

pub use anim::FrameTime;

pub use anim::Lerp;

pub use anim::Spring;

pub use anim::SpringDesc;

pub use anim::Tween;

pub use app::FocusRingPolicy;

pub use app::Orientation;

pub use app::RenderRoot;

pub use app::WindowMetrics;

pub use component::Component;

pub use component::ComponentView;

pub use component::ComponentWidget;

pub use component::component;

pub use event::CursorIcon;

pub use event::EditCommand;

pub use event::EditingState;

pub use event::EventCtx;

pub use event::EventOutcome;

pub use event::EventResult;

pub use event::ImeContentType;

pub use event::ImeEvent;

pub use event::ImeState;

pub use event::InputEvent;

pub use event::Key;

pub use event::KeyEvent;

pub use event::Modifiers;

pub use event::NamedKey;

pub use event::OverlayEvent;

pub use event::OverlayEventKind;

pub use event::PointerButton;

pub use event::PointerEvent;

pub use event::PointerPhase;

pub use event::ScrollDelta;

pub use event::has_pending_result_flush;

pub use event::mark_focus_orphaned;

pub use event::mark_pending_result_flush;

pub use event::take_focus_orphaned;

pub use event::take_pending_result_flush;

pub use input::FLING_DECAY;

pub use input::FLING_STOP;

pub use input::MOUSE_SLOP;

pub use input::TOUCH_SLOP;

pub use input::VELOCITY_WINDOW_MS;

pub use input::VelocityTracker;

pub use input::WHEEL_LINE_PX;

pub use input::fling_decay;

pub use input::fling_displacement;

pub use insets::CornerInset;

pub use insets::CornerInsets;

pub use insets::EdgeInsets as WindowEdgeInsets;

pub use insets::WindowInsets;

pub use layout::BoxConstraints;

pub use overlay::OutsideTap;

pub use overlay::OverlayBand;

pub use overlay::OverlayEntry;

pub use overlay::OverlayHit;

pub use overlay::OverlayInput;

pub use overlay::OverlayKey;

pub use overlay::OverlayKeys;

pub use overlay::OverlayPod;

pub use retained::RetainedEntry;

pub use retained::RetainedKey;

pub use retained::RetainedLedger;

pub use selection_toolbar::SelectionToolbarActions;

pub use selection_toolbar::SelectionToolbarBuilder;

pub use selection_toolbar::SelectionToolbarPolicy;

pub use selection_toolbar::SelectionToolbarRequest;

pub use selection_toolbar::install_selection_toolbar_builder_if_unset;

pub use selection_toolbar::lock_selection_toolbar_policy;

pub use selection_toolbar::selection_toolbar_builder;

pub use selection_toolbar::selection_toolbar_policy;

pub use selection_toolbar::set_selection_toolbar_builder;

pub use selection_toolbar::set_selection_toolbar_policy;

pub use semantics::SemanticsCtx;

pub use semantics::SemanticsUpdate;

pub use shortcuts::Chord;

pub use shortcuts::ChordParseError;

pub use shortcuts::ShortcutDecl;

pub use shortcuts::ShortcutHint;

pub use shortcuts::ShortcutId;

pub use shortcuts::ShortcutScope;

pub use sliver::GrowthDirection;

pub use sliver::ScrollAxis;

pub use sliver::ScrollDirection;

pub use sliver::SliverConstraints;

pub use sliver::SliverGeometry;

pub use sliver::SliverWidget;

pub use tree::InspectNode;

pub use tree::WidgetPod;

pub use tree::WidgetTree;

pub use view::AnyView;

pub use view::BuildCtx;

pub use view::ChangeFlags;

pub use view::View;

pub use view::ViewSeq;

pub use view::WidgetId;

pub use view::any;

pub use view::views;

pub use widget::ChildPod;

pub use widget::DiscardScene;

pub use widget::HeroDirective;

pub use widget::HeroFrames;

pub use widget::LayoutCtx;

pub use widget::PaintCtx;

pub use widget::PaintOutcome;

pub use widget::PaintScene;

pub use widget::TickClass;

pub use widget::Widget;

pub use accesskit;

Modules

anim

Animation vocabulary: the shared frame clock (FrameTime) plus the pure math widgets consume it through: easing Curves, Tween interpolation, analytic Spring dynamics, and the AnimationController.

app

The render root: the object each platform shell drives each frame.

component

Component: Flutter’s StatefulWidget analog.

event

Layer 2 input: the InputEvent vocabulary and the EventCtx a widget mutates handling it.

hit

Hit-testing under an arbitrary kurbo::Affine: the helpers a transformed ChildPod uses, for canvas hit closures and pan/zoom containers.

input

Pure, deterministic gesture helpers: slop/wheel constants, a trailing-window VelocityTracker and fling-decay math (cross-checked against masonry’s). Times are logical ms; positions and velocities are logical px and px/s.

insets

Window insets: Flutter’s ViewportMetrics inset model in the framework core.

layout

Box-constraint layout, the Flutter/Masonry box model (not CSS): a parent hands each child BoxConstraints and the child returns a Size within them.

overlay

The overlay portal: how a widget anywhere in the tree floats a pod above the whole app (menus, popovers, tooltips, selection toolbars).

retained

Retained-page keys and the resident-key ledger.

selection_toolbar

The selection-toolbar seam: what a focused text field publishes about its selection, and who draws the copy/cut/paste/select-all bar over it.

semantics

The semantics seam: a pull-based accessibility tree pass.

shortcuts

Keyboard shortcuts: the Chord spec and the per-paint declaration table behind PaintCtx::register_shortcut.

sliver

The sliver layout protocol for a scrolling viewport’s children, mirroring Flutter’s RenderSliver (rendering/sliver.dart).

tree

The retained widget tree, backed by tree_arena.

view

Layer 1: the declarative View trait.

widget

Layer 2: the retained Widget trait and its layout/paint contexts.

Structs

CornerRadii

Re-exported so widgets can name PaintScene’s argument types. Per-corner radii for a rounded rectangle, in the pre-transform coordinate space.

DashPattern

Re-exported so widgets can name PaintScene’s argument types. A stroke’s dash pattern: an on run, an off gap, and a phase offset into that repeating cycle — all lengths in the pre-transform coordinate space.