run_key_action(): Call a function pointer when mode changes

Take a function pointer argument that will be called whenever a mode is
activated or deactivated. We'll be using this on the Objective-C side to
play audio when the mode changes.

2 files changed, 12 insertions, 4 deletions

diff --git a/src/ffi.rs b/src/ffi.rs
index 1ea2eae..55b0998 100644
--- a/src/ffi.rs
+++ b/src/ffi.rs
@@ -9,7 +9,7 @@ use xdg;
 
 use {HeadphoneButton, MapGroup};
 use config::{self, Config};
-use map::{PlayAudio, run_key_action};
+use map::{ModeChange, run_key_action};
 use trial;
 
 #[repr(C)]
@@ -90,7 +90,7 @@ pub extern "C" fn dome_key_state_load_map_group(ptr: *mut State) {
 pub extern "C" fn dome_key_run_key_action(
     state: *mut State,
     trigger: Trigger,
-    play_audio: PlayAudio,
+    on_mode_change: extern "C" fn(mode_change: ModeChange),
 ) {
     let trigger = unsafe {
         assert!(!trigger.buttons.is_null());
@@ -103,7 +103,7 @@ pub extern "C" fn dome_key_run_key_action(
         &mut *state
     };
 
-    run_key_action(&mut state, trigger, play_audio);
+    run_key_action(&mut state, trigger, on_mode_change);
 }
 
 #[no_mangle]
diff --git a/src/map.rs b/src/map.rs
index f2cd770..54da17a 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -21,10 +21,16 @@ impl PlayAudio {
     }
 }
 
+#[repr(C)]
+pub enum ModeChange {
+    Activated,
+    Deactivated,
+}
+
 pub fn run_key_action<'a>(
     state: &mut State,
     trigger: &'a [HeadphoneButton],
-    play_audio: PlayAudio,
+    on_mode_change: extern "C" fn(mode_change: ModeChange),
 ) {
     match state.map_group {
         Some(ref map_group) => {
@@ -43,6 +49,7 @@ pub fn run_key_action<'a>(
                         //         Err(e) => error!("{}", e),
                         //     }
                         // }
+                        on_mode_change(ModeChange::Deactivated);
 
                         return;
                     }
@@ -68,6 +75,7 @@ pub fn run_key_action<'a>(
                 //         Err(e) => error!("{}", e),
                 //     }
                 // }
+                on_mode_change(ModeChange::Activated);
             }
         },
         None => (),