From ac65c0dc741f40388dde792003bb5bcc4b010695 Mon Sep 17 00:00:00 2001
From: Pedro A Osuna <posuna@cameo.com>
Date: Mon, 21 Jun 2021 10:52:20 -0700
Subject: [PATCH] Allow users to only listen to some volume change notification
 reasons

---
 CHANGELOG.md                         |  2 ++
 README.md                            |  5 +++++
 SystemSetting.d.ts                   |  1 +
 SystemSetting.js                     |  4 ++++
 examples/SystemSettingExample/App.js |  2 ++
 ios/RTCSystemSetting.m               | 15 +++++++++++++--
 6 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2e1cac9..1c3c4f3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,5 @@
+# Unrealeased
+Allow users to only listen to some volume change notification reasons
 # V1.7.6
 **2020-10-11**
 
diff --git a/README.md b/README.md
index 28ee5be..89c7317 100644
--- a/README.md
+++ b/README.md
@@ -103,6 +103,11 @@ SystemSetting.getVolume().then((volume)=>{
 // change the volume
 SystemSetting.setVolume(0.5);
 
+// listen only to some volume changes, based on the change reason (AVSystemController_AudioVolumeChangeReasonNotificationParameter). 
+// If missing API call or sent an empty array it will listen to all changes. 
+// Pass reasons like "ExplicitVolumeChange", "RouteChange", et al
+SystemSetting.setVolumeChangeListenerReasons(["ExplicitVolumeChange"])
+
 // listen the volume changing if you need
 const volumeListener = SystemSetting.addVolumeListener((data) => {
     const volume = data.value;
diff --git a/SystemSetting.d.ts b/SystemSetting.d.ts
index 82cb2e7..cf9cd7c 100644
--- a/SystemSetting.d.ts
+++ b/SystemSetting.d.ts
@@ -43,6 +43,7 @@ interface SystemSetting {
   restoreBrightness: () => number;
   getVolume: (type?: VolumeType) => Promise<number>;
   setVolume: (value: number, config?: VolumeConfig | VolumeType) => void;
+  setVolumeChangeListenerReasons: (val: Array<string>) => Promise<boolean>;
   addVolumeListener: (
     callback: (volumeData: VolumeData) => void
   ) => EmitterSubscription;
diff --git a/SystemSetting.js b/SystemSetting.js
index d6cdd11..0662959 100644
--- a/SystemSetting.js
+++ b/SystemSetting.js
@@ -128,6 +128,10 @@ export default class SystemSetting {
         SystemSettingNative.setVolume(val, config)
     }
 
+    static setVolumeChangeListenerReasons(val) {
+        return SystemSettingNative.setVolumeChangeListenerReasons(val)
+    }
+
     static addVolumeListener(callback) {
         return eventEmitter.addListener('EventVolume', callback)
     }
diff --git a/examples/SystemSettingExample/App.js b/examples/SystemSettingExample/App.js
index bafbb9d..ba81b4c 100644
--- a/examples/SystemSettingExample/App.js
+++ b/examples/SystemSettingExample/App.js
@@ -46,6 +46,8 @@ export default class SystemSettingExample extends Component {
         this._changeSliderNativeVol(this.sliderVol, this.state.volume)
         this._changeSliderNativeVol(this.sliderBri, this.state.brightness)
 
+        SystemSetting.setVolumeChangeListenerReasons(["ExplicitVolumeChange"])
+
         this.volumeListener = SystemSetting.addVolumeListener((data) => {
             const volume = this.isAndroid ? data[this.state.volType] : data.value
             this._changeSliderNativeVol(this.sliderVol, volume)
diff --git a/ios/RTCSystemSetting.m b/ios/RTCSystemSetting.m
index e9fe63f..242ea69 100644
--- a/ios/RTCSystemSetting.m
+++ b/ios/RTCSystemSetting.m
@@ -28,6 +28,7 @@ @interface RCTSystemSetting()
 
 @implementation RCTSystemSetting {
     bool hasListeners;
+    NSArray<NSString *> * _Nonnull volumeChangeListenerReasons;
     long skipSetVolumeCount;
 #ifdef BLUETOOTH
     CBCentralManager *cb;
@@ -53,6 +54,7 @@ -(instancetype)init{
 #ifdef PRIVATE_API
     [self initSetting];
 #endif
+    volumeChangeListenerReasons = @[];
 
     return self;
 }
@@ -97,6 +99,11 @@ +(BOOL)requiresMainQueueSetup{
     resolve([NSNumber numberWithDouble:[UIScreen mainScreen].brightness]);
 }
 
+RCT_EXPORT_METHOD(setVolumeChangeListenerReasons:(nonnull NSArray<NSString *> *)val resolve:(RCTPromiseResolveBlock)resolve rejecter:(RCTPromiseRejectBlock)reject){
+    volumeChangeListenerReasons = val;
+    resolve([NSNumber numberWithBool:YES]);
+}
+
 RCT_EXPORT_METHOD(setVolume:(float)val config:(NSDictionary *)config){
     skipSetVolumeCount++;
     dispatch_sync(dispatch_get_main_queue(), ^{
@@ -220,8 +227,12 @@ -(void)stopObserving {
 
 -(void)volumeChanged:(NSNotification *)notification{
     if(skipSetVolumeCount == 0 && hasListeners){
-        float volume = [[[notification userInfo] objectForKey:@"AVSystemController_AudioVolumeNotificationParameter"] floatValue];
-        [self sendEventWithName:@"EventVolume" body:@{@"value": [NSNumber numberWithFloat:volume]}];
+        NSDictionary *userInfo = [notification userInfo];
+        NSString *reason = [userInfo objectForKey:@"AVSystemController_AudioVolumeChangeReasonNotificationParameter"];
+        if (volumeChangeListenerReasons.count == 0 || [volumeChangeListenerReasons containsObject:reason]) {
+            float volume = [[userInfo objectForKey:@"AVSystemController_AudioVolumeNotificationParameter"] floatValue];
+            [self sendEventWithName:@"EventVolume" body:@{@"value": [NSNumber numberWithFloat:volume]}];
+        }
     }
     if(skipSetVolumeCount > 0){
         skipSetVolumeCount--;