Crate rlvgl_core 

Core runtime types and utilities for the rlvgl UI toolkit.

This crate exposes the building blocks used by higher-level widgets and platform backends. It is intended to be usable in no_std environments and therefore avoids allocations where possible.

Widgets are organized into a tree of WidgetNode values which receive Events and draw themselves via a Renderer implementation.

Note: Event and Renderer are externally supplied types, not defined in this crate.

Re-exports

pub use plugins::canvas;canvas

pub use plugins::fatfs;fatfs

pub use plugins::fontdue;fontdue

pub use plugins::gif;gif

pub use plugins::apng;apng

pub use plugins::jpeg;jpeg

pub use plugins::lottie;lottie

pub use plugins::nes;nes

pub use plugins::pinyin;pinyin

pub use plugins::png;png

pub use plugins::qrcode;qrcode

Modules

anim

Tick-driven tween/animation system (deterministic, no wall clock). Tick-driven tween/animation system (ANIM initiative).

animation

Animation primitives: easing, looping, and legacy wall-clock animators.

application

Application trait for self-contained rlvgl applications.

assetfs

Asset path, handle, registry, cache, and source implementations.

bitmap_font

Minimal bitmap font for no_std text rendering.

cmd

Graphics-language layer: structured drawing commands as data. Graphics-language layer: structured drawing commands as data, separable from execution.

draw

Drawing helpers for rounded rectangles and borders. Drawing helpers that compose crate::renderer::Renderer calls to produce rounded rectangles and borders without extending the renderer trait.

edit

Shared edit-state machine (buffer, caret, mutation gates) promoted from rlvgl-ui so that rlvgl-widgets can depend on it without a crate cycle (LPAR-14 §5.C). Shared edit-state machine promoted from rlvgl-ui (LPAR-14 §5.C).

event

Basic UI events used for widgets.

focus

Focus traversal and group policy for the LPAR-04 event/focus runtime. Focus traversal and group policy for the LPAR-04 event/focus runtime.

font

Backend-neutral font metrics, shaping, and greedy wrapping. Backend-neutral font metrics, shaping, and greedy LTR wrapping.

fsfs

Asset loading interfaces for filesystem-backed content.

icon_bitmap

1-bit bitmap icons (folder, file) rendered at font height. 1-bit bitmap icons for the file browser.

image

Image descriptors, blit options, and cache handles. Image descriptor, blit option, and cache-handle primitives.

interface

Traits for hardware abstraction (Display, Input, Time).

invalidation

Shared invalidation planner and present-plan types (LPAR-03). Shared invalidation planner and present-plan types (LPAR-03).

layout

LPAR-10 layout substrate: Dimension, flex/grid engines, LayoutState, and layout pass. LPAR-10 layout substrate: Dimension, flex/grid engines, LayoutState, LayoutPass, and LayoutStyle.

mask

LPAR-08 alpha mask primitives and coverage combinators. Alpha mask primitives for LPAR-08 draw coverage composition.

object

LVGL-parity object metadata and tree helpers. LVGL-parity object metadata and tree helpers.

object_anim

Node-resident object animations; see object_anim::ObjectAnims. Node-resident object animations (LPAR-06 §6).

observer

LPAR-15 value-binding Subject<T> — orthogonal to the LPAR-04 event system. Value-binding Subject<T> for deterministic observer notifications.

packed_font

Variable-width packed font renderer (grayscale anti-aliased). Variable-width packed font renderer for no_std.

plugins

Plugins for optional media formats and UI integrations.

property

LPAR-15 typed property accessor: PropertyValue enum and the Queryable trait. Typed property accessor model for widget introspection.

raster

Anti-aliased rasterization kernels (OBB and helpers) usable by both software and hardware-accelerated Renderer implementations. Anti-aliased rasterization kernels.

renderer

Rendering interface used by widgets.

scroll

LPAR-05 scroll runtime: scroll state, controller, and snap logic. LPAR-05 scroll runtime: state, controller, and snap logic.

style

Visual appearance attributes applied to widgets.

style_cascade

LPAR-07 style cascade substrate: Part, Selector, StylePatch, StyleState, and resolution. LPAR-07 style cascade substrate: Part, Selector, StylePatch, StyleState, InheritedContext, and top-down cascade resolution.

theme

Theme trait and basic implementations.

timer

Tick-driven timer registry; see timer::Timers. Tick-driven timer registry — no_std + alloc, no wall clock (LPAR-06 §5).

widget

Basic widget traits and geometry types.

Structs

WidgetNode

Node in the widget hierarchy.