Crate fission_core 

fission-core

The runtime, widget system, and action/reducer architecture for the Fission UI framework.

fission-core provides:

• A declarative widget tree built from composable primitives (Node, Widget).
• A unidirectional data-flow pipeline: Action -> Runtime::dispatch -> reducer -> mutated AppState.
• An effect system for async side-effects (Effect, SystemEffect).
• Built-in widgets: Button, Text, [TextInput], [Container], Row, Column, [Scroll], [ZStack], [Grid], [LazyColumn], and more.

Getting started

use fission_core::*;
use fission_core::ui::*;

// Define application state
#[derive(Debug, Default)]
struct MyState { value: String }
impl AppState for MyState {}

// Build a widget
struct MyWidget;
impl Widget<MyState> for MyWidget {
    fn build(&self, ctx: &mut BuildCtx<MyState>, view: &View<MyState>) -> Node {
        Text::new(&*view.state.value).into_node()
    }
}

Re-exports

pub use action::Action;

pub use action::ActionEnvelope;

pub use action::ActionId;

pub use action::AppState;

pub use context::ReducerContext;

pub use context::Effects;

pub use effect::Effect;

pub use effect::EffectEnvelope;

pub use effect::EffectPayload;

pub use effect::ActionInput;

pub use effect::SystemEffect;

pub use env::Env;

pub use env::InteractionStateMap;

pub use env::RuntimeState;

pub use env::ScrollStateMap;

pub use env::Clipboard;

pub use env::ImeHandler;

pub use runtime::Runtime;

pub use event::InputEvent;

pub use event::KeyCode;

pub use event::KeyEvent;

pub use event::LifecycleEvent;

pub use event::PointerButton;

pub use event::PointerEvent;

pub use lowering::LoweringContext;

pub use lowering::NodeBuilder;

pub use registry::ActionRegistry;

pub use registry::AnimationPropertyId;

pub use registry::AnimationRequest;

pub use registry::AnimationStartValue;

pub use registry::BuildCtx;

pub use registry::Handler;

pub use registry::PortalLayer;

pub use registry::VideoRegistration;

pub use time::Clock;

pub use time::CurrentTime;

pub use ui::Builder;

pub use ui::Button;

pub use ui::Column;

pub use ui::CustomNode;

pub use ui::LayoutBuilder;

pub use ui::Lower;

pub use ui::LowerDyn;

pub use ui::Node;

pub use ui::Row;

pub use ui::Text;

pub use view::Selector;

pub use view::View;

pub use view::Widget;

Modules

action

Actions, envelopes, and application state traits.

context

Reducer context and effect builder.

diff

effect

Side-effect primitives for async operations.

env

event

Input events consumed by the Runtime.

hit_test

input

lowering

media

op

Operations that IR nodes can perform.

registry

runtime

time

ui

view

Read-only view, widget trait, and selector pattern.

Structs

ADVANCE_TO_ACTION_ID

AdvanceTo

An action that sets the runtime clock to an absolute timestamp.

BoxConstraints

Minimum and maximum width/height bounds passed from parent to child during layout.

LayoutEngine

The constraint-based layout solver.

LayoutPoint

A 2D point in layout coordinate space.

LayoutRect

An axis-aligned rectangle: an origin point plus a size.

LayoutSize

A 2D size in layout coordinate space.

LayoutSnapshot

The complete output of a layout pass.

NodeId

A content-addressed 128-bit node identity.

TICK_ACTION_ID

Tick

A frame-tick action that advances the runtime clock by a delta.

WidgetNodeId

A 128-bit identity for a widget.

Enums

EmbedKind

The kind of platform-native surface embedded in the UI.

FlexDirection

The primary axis direction for a flex or scroll container.

LayoutOp

A layout operation that sizes and positions a node and its children.

Op

The operation a node performs.

Traits

TextMeasurer

A platform-provided text measurement backend.

Type Aliases

BoxedReducer

A type-erased reducer function stored in the Runtime.

LayoutUnit

The scalar type used for all layout measurements.