Use isize for InputContext::PRIORITY

CHANGELOG.md

@@ -24,6 +24,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Rename `Pressed` into `Press`.
 - Rename `BlockedBy` into `BlockBy`.
 - Rename `Scalar` into `Scale`.
+- Use `isize` for `InputContext::PRIORITY`.
 - Replace `SmoothDelta` with `LerpDelta` that does only linear interpolation. Using easing functions for inputs doesn't make much sense.
 - Modifiers are now allowed to change passed value dimensions.
 - All built-in modifiers now handle values of any dimention.

examples/context_layering.rs

@@ -134,7 +134,7 @@ struct EnterWater;
 struct Swimming;
 
 impl InputContext for Swimming {
-    const PRIORITY: usize = 1; // Set higher priority to execute its actions first.
+    const PRIORITY: isize = 1; // Set higher priority to execute its actions first.
 
     fn context_instance(_world: &World, _entity: Entity) -> ContextInstance {
         let mut ctx = ContextInstance::default();

src/input_context.rs

@@ -203,12 +203,12 @@ impl ContextInstances {
 enum InstanceGroup {
     Exclusive {
         type_id: TypeId,
-        priority: usize,
+        priority: isize,
         instances: Vec<(Entity, ContextInstance)>,
     },
     Shared {
         type_id: TypeId,
-        priority: usize,
+        priority: isize,
         entities: Vec<Entity>,
         ctx: ContextInstance,
     },
@@ -234,7 +234,7 @@ impl InstanceGroup {
         }
     }
 
-    fn priority(&self) -> usize {
+    fn priority(&self) -> isize {
         match *self {
             InstanceGroup::Exclusive { priority, .. } => priority,
             InstanceGroup::Shared { priority, .. } => priority,
@@ -305,7 +305,7 @@ pub trait InputContext: Component {
     ///
     /// Ordering is global.
     /// Contexts with a higher priority evaluated first.
-    const PRIORITY: usize = 0;
+    const PRIORITY: isize = 0;
 
     /// Creates a new instance for the given entity.
     ///

tests/priority.rs

@@ -60,7 +60,7 @@ fn prioritization() {
 struct First;
 
 impl InputContext for First {
-    const PRIORITY: usize = Second::PRIORITY + 1;
+    const PRIORITY: isize = Second::PRIORITY + 1;
 
     fn context_instance(_world: &World, _entity: Entity) -> ContextInstance {
         let mut ctx = ContextInstance::default();