Struct Session 

#[non_exhaustive]
pub struct Session {
    pub world: World,
    pub stages: SystemStages,
    pub active: bool,
    pub visible: bool,
    pub priority: i32,
    pub runner: Box<dyn SessionRunner>,
}

Contains a bones World for state, SystemStages for behavior, and a SessionRunner to determine how those are used.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

world: World

The ECS world for the core.

stages: SystemStages

The system stages.

active: bool

Whether or not this session should have it’s systems run.

visible: bool

Whether or not this session should be rendered.

priority: i32

The priority of this session relative to other sessions in the Game.

runner: Box<dyn SessionRunner>

The session runner to use for this session.

Implementations

impl Session

pub fn priority(&mut self, priority: i32) -> &mut Session

Set the priority of this session relative to other sessions in the Game.

pub fn runner(&mut self, runner: Box<dyn SessionRunner>) -> &mut Session

Set the SessionRunner to use for this session.

pub fn activity(&mut self, active: bool) -> &mut Session

Set whether or not this session should have it’s systems run.

pub fn visibility(&mut self, visible: bool) -> &mut Session

Set whether or not this session should be rendered.

pub fn visible(&mut self) -> &mut Session

Set this session to be rendered.

pub fn invisible(&mut self) -> &mut Session

Set this session to not be rendered.

pub fn active(&mut self) -> &mut Session

Set this session to have it’s systems run.

pub fn inactive(&mut self) -> &mut Session

Set this session to not have it’s systems run.

pub fn install_plugin(&mut self, plugin: impl SessionPlugin) -> &mut Session

Install a SessionPlugin.

Methods from Deref<Target = SystemStages>

pub fn add_system_to_stage<Args, S>( &mut self, label: impl StageLabel, system: S, ) -> &mut SystemStages

where S: IntoSystem<Args, (), (), Sys = StaticSystem<(), ()>>,

Add a System to the stage with the given label.

pub fn insert_stage_before<L, S>( &mut self, label: L, stage: S, ) -> &mut SystemStages

where L: StageLabel, S: SystemStage + 'static,

Insert a new stage, before another existing stage

pub fn insert_stage_after<L, S>( &mut self, label: L, stage: S, ) -> &mut SystemStages

where L: StageLabel, S: SystemStage + 'static,

Insert a new stage, after another existing stage

pub fn run(&mut self, world: &mut World)

Execute the systems on the given world.

pub fn add_startup_system<Args, S>(&mut self, system: S) -> &mut SystemStages

where S: IntoSystem<Args, (), (), Sys = StaticSystem<(), ()>>,

👎Deprecated: use .add_system_to_stage(CoreStage::Startup, your_system) instead

Add a system to the CoreStage::Startup stage which specially runs only once, before all other core stages. Inserting CoreStageStartupSystemsRan into the world prevents systems in the startup stage from running.

pub fn add_single_success_system<Args, S>( &mut self, system: S, ) -> &mut SystemStages

where S: IntoSystem<Args, (), Option<()>, Sys = StaticSystem<(), Option<()>>>,

👎Deprecated: use `.add_system_to_stage(First, single_success_system(your_system)

Convenience method. Adds a system that will run each frame until it succeeds (returns Some). Uses Option to allow for easy usage of ?. System is added to CoreStage::First.

See also the wrapper function used inside single_success_system.

pub fn init_startup_resource<R>(&mut self) -> &mut SystemStages

where R: HasSchema + FromWorld,

Adds a system to CoreStage::Startup that inserts the default value of a resource into the World if it doesn’t already exist.

pub fn add_startup_resource<R>(&mut self, resource: R) -> &mut SystemStages

where R: HasSchema,

Adds a system to CoreStage::StartupResource that inserts the given resource into the World if it doesn’t already exist. The resource type is required to have a HasSchema clone implementation to re-insert the resource into the world after the first startup.

Clone Requirement Details

If the type being added implements HasSchema with the derive like so:

#[derive(HasSchema, Default)]
#[schema(no_clone)] // This bypasses HasSchema clone requirements.
struct ResourceBeingInserted;

Then the system being added to the StartupResource system stage will panic when inserting a second time. The startup resource stage only runs once so it is therefore safe to use a type like the example above as long as you don’t plan on removing from the World the StartupSystemStage tag which in this case is CoreStageStartupResourceSystemsRan.

Trait Implementations

impl Debug for Session

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for Session

fn default() -> Session

Returns the “default value” for a type.

impl Deref for Session

type Target = SystemStages

The resulting type after dereferencing.

fn deref(&self) -> &<Session as Deref>::Target

Dereferences the value.

impl DerefMut for Session

fn deref_mut(&mut self) -> &mut <Session as Deref>::Target

Mutably dereferences the value.