Crate presentar_core 

Core types and traits for Presentar UI framework.

This crate provides foundational types used throughout Presentar:

• Geometric primitives: Point, Size, Rect
• Color representation: Color with WCAG contrast calculations
• Layout constraints: Constraints
• Events and messages: Event, [Message]
• Draw commands: DrawCommand for GPU rendering

Quick Start

use presentar_core::{Color, Size, Constraints, Rect};

// Create a size
let size = Size::new(100.0, 50.0);

// Create constraints
let constraints = Constraints::new(0.0, 200.0, 0.0, 100.0);
let bounded = constraints.constrain(size);

// Create a color
let red = Color::RED;
assert_eq!(red.r, 1.0);

Widget Trait

The core Widget trait defines the measure-layout-paint cycle:

use presentar_core::{Widget, Constraints, Size, Canvas};

struct MyWidget;

impl Widget for MyWidget {
    fn measure(&self, constraints: &Constraints) -> Size {
        constraints.constrain(Size::new(100.0, 50.0))
    }

    fn layout(&mut self, size: Size) { }

    fn paint(&self, canvas: &mut dyn Canvas) { }
}

Re-exports

pub use accessibility::AccessibilityTree;

pub use accessibility::AccessibilityTreeBuilder;

pub use accessibility::AccessibleNode;

pub use accessibility::AccessibleNodeId;

pub use accessibility::CheckedState;

pub use accessibility::HitTester;

pub use accessibility::LiveRegion;

pub use animation::AnimColor;

pub use animation::AnimatedValue;

pub use animation::AnimationController;

pub use animation::EasedValue;

pub use animation::Easing;

pub use animation::Interpolate;

pub use animation::Keyframe;

pub use animation::KeyframeTrack;

pub use animation::Spring;

pub use animation::SpringConfig;

pub use cache::CacheBuilder;

pub use cache::CacheCallback;

pub use cache::CacheConfig;

pub use cache::CacheEvent;

pub use cache::CacheKey;

pub use cache::CacheMetadata;

pub use cache::CacheOptions;

pub use cache::CacheSize;

pub use cache::CacheState;

pub use cache::CacheStats;

pub use cache::DataCache;

pub use cache::StringCache;

pub use chart::ArcGeometry;

pub use chart::CatmullRom;

pub use chart::CubicBezier;

pub use chart::CubicSpline;

pub use chart::DataNormalizer;

pub use chart::DrawBatch;

pub use chart::HistogramBins;

pub use chart::Interpolator;

pub use chart::LinearInterpolator;

pub use chart::PathTessellator;

pub use chart::Point2D;

pub use clipboard::Clipboard;

pub use clipboard::ClipboardData;

pub use clipboard::ClipboardEvent;

pub use clipboard::ClipboardFormat;

pub use clipboard::ClipboardHistory;

pub use clipboard::ClipboardOperation;

pub use clipboard::ClipboardResult;

pub use diff::diff_trees;

pub use diff::DiffNode;

pub use diff::DiffOp;

pub use diff::DiffResult;

pub use diff::TreeDiffer;

pub use diff::WidgetKey;

pub use dnd::DragData;

pub use dnd::DragDataType;

pub use dnd::DragDropManager;

pub use dnd::DragId;

pub use dnd::DragPayload;

pub use dnd::DragPhase;

pub use dnd::DragState;

pub use dnd::DropEffect;

pub use dnd::DropResult;

pub use dnd::DropTarget;

pub use draw::BoxStyle;

pub use draw::DrawCommand;

pub use draw::FillRule;

pub use draw::LineCap;

pub use draw::LineJoin;

pub use draw::PathRef;

pub use draw::Sampling;

pub use draw::Shadow;

pub use draw::StrokeStyle;

pub use draw::TensorRef;

pub use draw::Transform2D as DrawTransform;

pub use gesture::GestureConfig;

pub use gesture::GestureRecognizer;

pub use gesture::PointerGestureRecognizer;

pub use gesture::PointerInfo;

pub use gesture::RecognizedGesture;

pub use gesture::TouchPoint;

pub use history::Checkpoint;

pub use history::CheckpointId;

pub use history::Command as HistoryCommand;

pub use history::CommandHistory;

pub use history::CommandId;

pub use history::CommandResult;

pub use history::CompositeCommand;

pub use history::GroupId;

pub use history::HistoryCallback;

pub use history::HistoryConfig;

pub use history::HistoryEvent;

pub use history::SetValueCommand;

pub use lifecycle::Effect;

pub use lifecycle::EffectManager;

pub use lifecycle::HookId;

pub use lifecycle::LifecycleEvent;

pub use lifecycle::LifecycleManager;

pub use lifecycle::LifecyclePhase;

pub use shortcut::Modifiers;

pub use shortcut::Shortcut;

pub use shortcut::ShortcutBuilder;

pub use shortcut::ShortcutContext;

pub use shortcut::ShortcutId;

pub use shortcut::ShortcutManager;

pub use shortcut::ShortcutPriority;

pub use streaming::ConnectionState;

pub use streaming::DataStream;

pub use streaming::MessageBuffer;

pub use streaming::RateLimiter;

pub use streaming::ReconnectConfig;

pub use streaming::StreamConfig;

pub use streaming::StreamMessage;

pub use streaming::StreamSubscription;

pub use theme::ColorPalette;

pub use theme::ContrastCheck;

pub use theme::Radii;

pub use theme::Shadows;

pub use theme::Spacing;

pub use theme::Theme;

pub use theme::Typography;

pub use validation::FieldConfig;

pub use validation::FieldState;

pub use validation::FormValidator;

pub use validation::MaxLength;

pub use validation::MinLength;

pub use validation::Pattern;

pub use validation::PatternType;

pub use validation::Range;

pub use validation::Required;

pub use validation::ValidateOn;

pub use validation::ValidationResult;

pub use validation::Validator;

pub use virtualization::CellLayout;

pub use virtualization::GridCell;

pub use virtualization::ItemIndex;

pub use virtualization::ItemLayout;

pub use virtualization::ScrollAlign;

pub use virtualization::VirtualGrid;

pub use virtualization::VirtualGridConfig;

pub use virtualization::VirtualList;

pub use virtualization::VirtualListConfig;

pub use virtualization::VisibleGridRange;

pub use virtualization::VisibleRange;

pub use widget::AccessibleRole;

pub use widget::Canvas;

pub use widget::FontStyle;

pub use widget::FontWeight;

pub use widget::LayoutResult;

pub use widget::TextStyle;

pub use widget::Transform2D;

pub use widget::TypeId;

pub use widget::Widget;

pub use widget::WidgetId;

Modules

accessibility

Accessibility support for screen readers and assistive technology.

animation

Animation system with spring physics, easing, and keyframe support.

binding

Interactive state binding for reactive UI.

cache

chart

Chart rendering algorithms for Presentar.

clipboard

Clipboard API for copy, cut, and paste operations.

diff

Widget tree diffing for efficient UI updates.

dnd

Drag and drop system for interactive data transfer.

draw

Draw commands for GPU rendering.

gesture

Gesture recognition from touch/pointer events.

history

lifecycle

Widget lifecycle hooks for mount, update, and unmount callbacks.

shortcut

Keyboard shortcut management system.

simd

SIMD-accelerated operations using Trueno.

streaming

Data streaming and live updates for Presentar.

theme

Theme system for consistent styling.

validation

Declarative validation system for forms and inputs.

virtualization

widget

Widget trait and related types.

Structs

AnimatedProperty

An animated property that smoothly transitions between values.

AnimationInstance

An animation instance that can be managed by an Animator.

Animator

Manages multiple animations.

Color

RGBA color with values in the range [0.0, 1.0].

CommandExecutor

Command executor for synchronous commands.

Constraints

Layout constraints that specify minimum and maximum sizes.

CornerRadius

Corner radii for rounded rectangles.

CounterState

A simple counter state for testing.

DataRefreshManager

Manages periodic data refresh for data sources.

ExecutorConfig

Command executor configuration.

FocusManager

Manages keyboard focus for widgets.

FocusTrap

A focus trap that restricts focus to a subset of widgets.

FrameTimer

Frame timer for 60fps animations.

MemoryRouter

In-memory router for testing.

MemoryStorage

In-memory storage for testing.

Point

A 2D point with x and y coordinates.

PointerId

Pointer identifier for pointer events.

RecordingCanvas

A Canvas implementation that records draw operations as DrawCommands.

Rect

A rectangle defined by position and size.

RefreshTask

A scheduled data refresh task.

Size

A 2D size with width and height.

SpringAnimation

Spring-based animation for physics-like motion.

Store

Store manages state lifecycle with subscriptions and time-travel debugging.

Timer

A timer that fires at regular intervals.

TouchId

Touch identifier for multi-touch tracking.

TransitionConfig

Configuration for property transitions.

Tween

A tween that interpolates between two values over time.

Enums

AnimationState

Animation state for tracking animation lifecycle.

ColorParseError

Error type for color parsing.

Command

Commands for side effects.

CounterMessage

Messages for the counter state.

EasingFunction

Easing functions for smooth animations.

Event

Input event types.

ExecutionResult

Result of command execution.

FocusDirection

Focus direction for keyboard navigation.

GestureState

State of a gesture.

Key

Keyboard key identifiers.

MouseButton

Mouse button identifiers.

PointerType

Type of pointer device.

Traits

Router

Router trait for navigation commands.

State

Application state trait.

Storage

Storage trait for state persistence commands.

Functions

default_executor

Create a default executor with memory-based backends.

Type Aliases

AnimationId

Unique identifier for an animation.