simplemusic: add listener for button presses

apps/simplemusic/README.md

@@ -20,6 +20,12 @@ Note: On startup, Simple Music will ping Gadgetbridge for track data by quickly
 
 ## Controls
 
+### Button controls
+
+Press the side button to toggle playing or pausing the current track.
+
+### Touch controls
+
 Use the on-screen buttons to go back to the previous track, play/pause the current track, or skip to the next track.
 
 Swipe up/down to increase/decrease the volume, or swip left/right to navigate to the previous/next song.

apps/simplemusic/app.js

@@ -179,8 +179,7 @@ function updateState(state) {
 /**
  * Listen for Gadgetbridge events
  */
-setTimeout(
-  () => {
+setTimeout(() => {
   globalThis.GB = (_GB => e => {
     switch (e.t) {
       case "musicinfo":
@@ -194,6 +193,10 @@ setTimeout(
   })(globalThis.GB);
 }, 1);
 
+// Toggle play/pause if the button is pressed
+setWatch(function() {
+  sendCommand(appState.state === PlaybackState.paused ? Command.play : Command.pause, true);
+}, BTN, {edge:"rising", debounce:50, repeat:true});
 
 // Start the app
 initialize();