From 79d010f4bcdb19d5a19d222dd3c3cb581fde891d Mon Sep 17 00:00:00 2001
From: David Redondo <kde@david-redondo.de>
Date: Fri, 17 Oct 2025 15:15:51 +0200
Subject: [PATCH] applets/taskmanager: Allow changing a tasks volume by
 scrolling

FEATURE:510668
FIXED-IN:6.6
---
 .../package/contents/config/main.xml          |  1 +
 .../package/contents/ui/ConfigBehavior.qml    |  3 ++-
 .../package/contents/ui/MouseHandler.qml      | 20 +++++++++++++++++++
 3 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/applets/taskmanager/package/contents/config/main.xml b/applets/taskmanager/package/contents/config/main.xml
index f71a7a8457..8c3b68785b 100644
--- a/applets/taskmanager/package/contents/config/main.xml
+++ b/applets/taskmanager/package/contents/config/main.xml
@@ -90,6 +90,7 @@
         <choice name="None"/>
         <choice name="AllTask"/>
         <choice name="TaskOnly"/>
+        <choice name="AdjustVolume"/>
       </choices>
       <default>0</default>
     </entry>
diff --git a/applets/taskmanager/package/contents/ui/ConfigBehavior.qml b/applets/taskmanager/package/contents/ui/ConfigBehavior.qml
index 2c0dc19154..73357e9dcd 100644
--- a/applets/taskmanager/package/contents/ui/ConfigBehavior.qml
+++ b/applets/taskmanager/package/contents/ui/ConfigBehavior.qml
@@ -202,13 +202,14 @@ KCMUtils.SimpleKCM {
 
         QQC2.ComboBox {
             id: wheelEnabled
-            Kirigami.FormData.label: i18nc("@label:listbox Part of a sentence: 'Scrolling behavior does nothing/cycles through tasks/cycles through the selected task's windows'", "Scrolling behavior:")
+            Kirigami.FormData.label: i18nc("@label:listbox Part of a sentence: 'Scrolling behavior does nothing/cycles through tasks/cycles through the selected task's windows/adjusts the hovered task’s volume''", "Scrolling behavior:")
             Layout.fillWidth: true
             Layout.minimumWidth: Kirigami.Units.gridUnit * 14
             model: [
                 i18nc("@item:inlistbox Part of a sentence: 'Scrolling behavior does nothing'", "Does nothing"),
                 i18nc("@item:inlistbox Part of a sentence: 'Scrolling behavior cycles through all tasks'", "Cycles through all tasks"),
                 i18nc("@item:inlistbox Part of a sentence: 'Scrolling behavior cycles through the hovered task's windows'", "Cycles through the hovered task’s windows"),
+                i18nc("@item:inlistbox Part of a sentence: 'Scrolling behavior adjusts the hovered task’s volume'", "Adjusts the hovered task’s volume"),
             ]
         }
 
diff --git a/applets/taskmanager/package/contents/ui/MouseHandler.qml b/applets/taskmanager/package/contents/ui/MouseHandler.qml
index cf2362835a..3f8d703d73 100644
--- a/applets/taskmanager/package/contents/ui/MouseHandler.qml
+++ b/applets/taskmanager/package/contents/ui/MouseHandler.qml
@@ -8,6 +8,7 @@ import QtQuick
 
 import org.kde.taskmanager as TaskManager
 import org.kde.plasma.plasmoid
+import org.kde.plasma.private.volume as PlasmaPa
 
 import "code/tools.js" as TaskTools
 
@@ -157,6 +158,10 @@ DropArea {
         }
     }
 
+    PlasmaPa.GlobalConfig {
+        id: plasmaPaConfig
+    }
+
     WheelHandler {
         id: wheelHandler
 
@@ -179,6 +184,21 @@ DropArea {
                 increment--;
             }
             const anchor = dropArea.target.childAt(event.x, event.y);
+            if (Plasmoid.configuration.wheelEnabled === 3) {
+                const loudest = anchor?.audioStreams?.reduce((loudest, stream) => Math.max(loudest, stream.volume), 0)
+                const step = (pulseAudio.item.normalVolume - pulseAudio.item.minimalVolume) * plasmaPaConfig.volumeStep / 100;
+                anchor?.audioStreams?.forEach((stream) => {
+                    let delta = step * increment;
+                    if (loudest > 0) {
+                        delta *= stream.volume / loudest;
+                    }
+                    const volume = stream.volume + delta;
+                    console.log(volume, Math.max(pulseAudio.item.minimalVolume, Math.min(volume, pulseAudio.item.normalVolume)));
+                    stream.model.Volume = Math.max(pulseAudio.item.minimalVolume, Math.min(volume, pulseAudio.item.normalVolume));
+                    stream.model.Muted = volume === 0
+                })
+            return;
+            }
             while (increment !== 0) {
                 TaskTools.activateNextPrevTask(anchor, increment < 0, Plasmoid.configuration.wheelSkipMinimized, Plasmoid.configuration.wheelEnabled, tasks);
                 increment += (increment < 0) ? 1 : -1;
-- 
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