feat(Bar/Widgets/MediaMini): change volume on scroll

Signed-off-by: Sefa Eyeoglu <contact@scrumplex.net>

Author: Scrumplex

Modules/Bar/Widgets/MediaMini.qml

@@ -64,6 +64,9 @@ Item {
   readonly property bool shouldHideEmpty: !hasPlayer && hideMode === "hidden"
   readonly property bool isHidden: shouldHideIdle || shouldHideEmpty
 
+  // Volume scroll
+  property int wheelAccumulator: 0
+
   // Title
   readonly property string title: {
     if (!hasPlayer)
@@ -392,6 +395,27 @@ Item {
     cursorShape: Qt.PointingHandCursor
     acceptedButtons: Qt.LeftButton | Qt.RightButton | Qt.MiddleButton | Qt.ForwardButton | Qt.BackButton
 
+    onWheel: function (ev) {
+      // Hide tooltip as soon as the user starts scrolling to adjust volume
+      TooltipService.hide();
+
+      ev.accepted = true;
+
+      var delta = ev.pixelDelta.y;
+
+      if (ev.inverted)
+            delta *= -1;
+
+      wheelAccumulator += delta;
+      if (wheelAccumulator >= 120) {
+        wheelAccumulator = 0;
+        MediaService.increaseVolume();
+      } else if (wheelAccumulator <= -120) {
+        wheelAccumulator = 0;
+        MediaService.decreaseVolume();
+      }
+    }
+
     onClicked: mouse => {
                  TooltipService.hide();
                  if (mouse.button === Qt.LeftButton) {

Services/Control/IPCService.qml

@@ -814,6 +814,14 @@ Singleton {
       }
       MediaService.seekByRatio(positionVal);
     }
+
+    function increase() {
+      MediaService.increaseVolume();
+    }
+
+    function decrease() {
+      MediaService.decreaseVolume();
+    }
   }
 
   IpcHandler {

Services/Media/MediaService.qml

@@ -45,6 +45,8 @@ Singleton {
   property string lengthString: formatTime(trackLength)
   property real infiniteTrackLength: 922337203685
 
+  readonly property real stepVolume: Settings.data.audio.volumeStep / 100.0
+
   Component.onCompleted: {
     updateCurrentPlayer();
   }
@@ -292,6 +294,20 @@ Singleton {
     }
   }
 
+  function increaseVolume() {
+    let target = currentPlayer ? (currentPlayer._controlTarget || currentPlayer) : null;
+    if (target && target.canControl && target.volumeSupported) {
+      target.volume = Math.min(1.0, target.volume + stepVolume);
+    }
+  }
+
+  function decreaseVolume() {
+    let target = currentPlayer ? (currentPlayer._controlTarget || currentPlayer) : null;
+    if (target && target.canControl && target.volumeSupported) {
+      target.volume = Math.max(0.0, target.volume - stepVolume);
+    }
+  }
+
   // Update progress bar every second while playing
   Timer {
     id: positionTimer