feat: use LevelIid as inner type for LevelSelection::Iid, and provide…

… a more convenient constructor

examples/platformer/systems.rs

@@ -394,7 +394,7 @@ pub fn update_level_selection(
                     && player_transform.translation.y > level_bounds.min.y
                     && !level_selection.is_match(&0, ldtk_level.data())
                 {
-                    *level_selection = LevelSelection::Iid(ldtk_level.data().iid.clone());
+                    *level_selection = LevelSelection::iid(ldtk_level.data().iid.clone());
                 }
             }
         }

src/resources/level_selection.rs

@@ -1,4 +1,4 @@
-use crate::ldtk::Level;
+use crate::{ldtk::Level, LevelIid};
 use bevy::prelude::*;
 
 /// Resource for choosing which level(s) to spawn.
@@ -16,7 +16,7 @@ pub enum LevelSelection {
     /// Spawn level from its index in the LDtk file's list of levels.
     Index(usize),
     /// Spawn level with the given level `iid`.
-    Iid(String),
+    Iid(LevelIid),
     /// Spawn level with the given level `uid`.
     Uid(i32),
 }
@@ -28,11 +28,15 @@ impl Default for LevelSelection {
 }
 
 impl LevelSelection {
+    pub fn iid(iid: impl Into<String>) -> Self {
+        LevelSelection::Iid(LevelIid::new(iid))
+    }
+
     pub fn is_match(&self, index: &usize, level: &Level) -> bool {
         match self {
             LevelSelection::Identifier(s) => *s == level.identifier,
             LevelSelection::Index(i) => *i == *index,
-            LevelSelection::Iid(i) => *i == level.iid,
+            LevelSelection::Iid(i) => *i.get() == level.iid,
             LevelSelection::Uid(u) => *u == level.uid,
         }
     }

src/systems.rs

@@ -183,7 +183,7 @@ fn pre_spawn_level(
         let mut translation = Vec3::ZERO;
 
         if let LevelSpawnBehavior::UseWorldTranslation { .. } = ldtk_settings.level_spawn_behavior {
-            if let Some(level) = ldtk_asset.get_level(&LevelSelection::Iid(level_iid.to_string())) {
+            if let Some(level) = ldtk_asset.get_level(&LevelSelection::iid(level_iid)) {
                 let level_coords = ldtk_pixel_coords_to_translation(
                     IVec2::new(level.world_x, level.world_y + level.px_hei),
                     0,
@@ -203,7 +203,7 @@ fn pre_spawn_level(
             })
             .insert(Name::new(
                 ldtk_asset
-                    .get_level(&LevelSelection::Iid(level_iid.to_string()))
+                    .get_level(&LevelSelection::iid(level_iid))
                     .unwrap()
                     .identifier
                     .to_owned(),