Add a new host function

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "mosaic-tile"
-version = "0.2.2"
+version = "0.3.0"
 authors = ["Brooks J Rady <b.j.rady@gmail.com>"]
 edition = "2018"
 description = "A small client-side library for writing mosaic plugins (tiles)"

src/shim.rs

@@ -34,7 +34,13 @@ pub fn open_file(path: &Path) {
     unsafe { host_open_file() };
 }
 
+pub fn set_selectable(selectable: bool) {
+    let selectable = if selectable { 1 } else { 0 };
+    unsafe { host_set_selectable(selectable) };
+}
+
 #[link(wasm_import_module = "mosaic")]
 extern "C" {
     fn host_open_file();
+    fn host_set_selectable(selectable: i32);
 }