From 6d0f3f0724d0b6091500f5673fc759d323fcdecb Mon Sep 17 00:00:00 2001
From: Dusty DeWeese <dustin.deweese@gmail.com>
Date: Sat, 4 Sep 2021 11:28:51 -0700
Subject: [PATCH] add Foreground and Background events

---
 src/event.rs                  | 12 ++++++++++++
 src/platform_impl/ios/view.rs |  9 +++++++--
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/src/event.rs b/src/event.rs
index 6660e00688..dfcf688e84 100644
--- a/src/event.rs
+++ b/src/event.rs
@@ -76,6 +76,12 @@ pub enum Event<'a, T: 'static> {
     /// Emitted when the application has been resumed.
     Resumed,
 
+    /// Emitted when the application will enter the foreground.
+    Foreground,
+
+    /// Emitted when the application has entered the background.
+    Background,
+
     /// Emitted when all of the event loop's input events have been processed and redraw processing
     /// is about to begin.
     ///
@@ -138,6 +144,8 @@ impl<T: Clone> Clone for Event<'static, T> {
             LoopDestroyed => LoopDestroyed,
             Suspended => Suspended,
             Resumed => Resumed,
+            Foreground => Foreground,
+            Background => Background,
         }
     }
 }
@@ -156,6 +164,8 @@ impl<'a, T> Event<'a, T> {
             LoopDestroyed => Ok(LoopDestroyed),
             Suspended => Ok(Suspended),
             Resumed => Ok(Resumed),
+            Foreground => Ok(Foreground),
+            Background => Ok(Background),
         }
     }
 
@@ -176,6 +186,8 @@ impl<'a, T> Event<'a, T> {
             LoopDestroyed => Some(LoopDestroyed),
             Suspended => Some(Suspended),
             Resumed => Some(Resumed),
+            Foreground => Some(Foreground),
+            Background => Some(Background),
         }
     }
 }
diff --git a/src/platform_impl/ios/view.rs b/src/platform_impl/ios/view.rs
index ccdec6bfbf..dc8dfabf7e 100644
--- a/src/platform_impl/ios/view.rs
+++ b/src/platform_impl/ios/view.rs
@@ -560,8 +560,13 @@ pub fn create_delegate_class() {
         unsafe { app_state::handle_nonuser_event(EventWrapper::StaticEvent(Event::Suspended)) }
     }
 
-    extern "C" fn will_enter_foreground(_: &Object, _: Sel, _: id) {}
-    extern "C" fn did_enter_background(_: &Object, _: Sel, _: id) {}
+    extern "C" fn will_enter_foreground(_: &Object, _: Sel, _: id) {
+        unsafe { app_state::handle_nonuser_event(EventWrapper::StaticEvent(Event::Foreground)) }
+    }
+
+    extern "C" fn did_enter_background(_: &Object, _: Sel, _: id) {
+        unsafe { app_state::handle_nonuser_event(EventWrapper::StaticEvent(Event::Background)) }
+    }
 
     extern "C" fn will_terminate(_: &Object, _: Sel, _: id) {
         unsafe {