feat: add source whitelist mode (#21)

package/contents/config/main.xml

@@ -70,6 +70,14 @@ PLAYING]]></default>
             <label>Show media controls</label>
             <default>true</default>
         </entry>
+        <entry name="sourcePriority" type="String">
+            <label>Source priority</label>
+            <default></default>
+        </entry>
+        <entry name="sourceWhitelist" type="Bool">
+            <label>Only use listed sources</label>
+            <default>false</default>
+        </entry>
         <entry name="trackTextVerticalSpacing" type="Int">
             <label>Track text vertical spacing</label>
             <default>5</default>

package/contents/ui/LabelContent.qml

@@ -7,13 +7,13 @@ Item {
     required property string artworkSource
     required property var labelLines
     required property string fontFamily
-    required property int fontPixelSize
+    required property real fontPixelSize
     required property string textColor
     required property bool textShadowEnabled
     required property int verticalSpacing
     required property int horizontalAlignment
     required property int borderRadius
-    required property int artworkSize
+    required property real artworkSize
     property string currentArtworkSource: ""
     property string incomingArtworkSource: ""
     property real currentArtworkOpacity: 0
@@ -104,7 +104,8 @@ Item {
     }
 
     clip: holdsArtworkSlot
-    implicitHeight: holdsArtworkSlot ? artworkSize : labelTextColumn.implicitHeight
+    implicitWidth: artworkSize
+    implicitHeight: artworkSize
     onArtworkSourceChanged: handleArtworkSourceChange()
     Component.onCompleted: handleArtworkSourceChange()
 
@@ -184,6 +185,7 @@ Item {
 
         anchors.left: parent.left
         anchors.right: parent.right
+        anchors.verticalCenter: parent.verticalCenter
         spacing: labelContent.verticalSpacing
         opacity: labelContent.textOpacity
         visible: opacity > 0

package/contents/ui/Player.qml

@@ -11,82 +11,159 @@ import org.kde.plasma.private.mpris as Mpris
 QtObject {
     id: root
 
+    readonly property int containerRole: Qt.UserRole + 1
     property string sourceName: "any"
+    property string sourcePriority: ""
+    property bool sourceWhitelist: false
     property var mpris2Model
+    property int modelRevision: 0
+    readonly property var normalizedSourcePriority: parseSourcePriority(sourcePriority)
+    readonly property var resolvedPlayer: resolvePlayer()
     readonly property bool ready: {
-        if (!mpris2Model.currentPlayer)
+        if (!resolvedPlayer)
             return false;
 
-        return mpris2Model.currentPlayer.desktopEntry === sourceName || sourceName === "any";
+        return sourceName === "any" || entriesMatch(resolvedPlayer.desktopEntry, sourceName);
     }
-    readonly property string artists: ready ? mpris2Model.currentPlayer.artist : ""
-    readonly property string title: ready ? mpris2Model.currentPlayer.track : ""
-    readonly property int playbackStatus: ready ? mpris2Model.currentPlayer.playbackStatus : Mpris.PlaybackStatus.Unknown
-    readonly property int shuffle: ready ? mpris2Model.currentPlayer.shuffle : Mpris.ShuffleStatus.Unknown
-    readonly property string artUrl: ready ? mpris2Model.currentPlayer.artUrl : ""
-    readonly property int loopStatus: ready ? mpris2Model.currentPlayer.loopStatus : Mpris.LoopStatus.Unknown
-    readonly property double songPosition: ready ? mpris2Model.currentPlayer.position : 0
-    readonly property double songLength: ready ? mpris2Model.currentPlayer.length : 0
-    readonly property real volume: ready ? mpris2Model.currentPlayer.volume : 0
-    readonly property string identity: ready ? mpris2Model.currentPlayer.identity : ""
-    readonly property bool canGoNext: ready ? mpris2Model.currentPlayer.canGoNext : false
-    readonly property bool canGoPrevious: ready ? mpris2Model.currentPlayer.canGoPrevious : false
-    readonly property bool canPlay: ready ? mpris2Model.currentPlayer.canPlay : false
-    readonly property bool canPause: ready ? mpris2Model.currentPlayer.canPause : false
-    readonly property bool canSeek: ready ? mpris2Model.currentPlayer.canSeek : false
-    readonly property bool canRaise: ready ? mpris2Model.currentPlayer.canRaise : false
+    readonly property string artists: ready ? resolvedPlayer.artist : ""
+    readonly property string title: ready ? resolvedPlayer.track : ""
+    readonly property int playbackStatus: ready ? resolvedPlayer.playbackStatus : Mpris.PlaybackStatus.Unknown
+    readonly property int shuffle: ready ? resolvedPlayer.shuffle : Mpris.ShuffleStatus.Unknown
+    readonly property string artUrl: ready ? resolvedPlayer.artUrl : ""
+    readonly property int loopStatus: ready ? resolvedPlayer.loopStatus : Mpris.LoopStatus.Unknown
+    readonly property double songPosition: ready ? resolvedPlayer.position : 0
+    readonly property double songLength: ready ? resolvedPlayer.length : 0
+    readonly property real volume: ready ? resolvedPlayer.volume : 0
+    readonly property string identity: ready ? resolvedPlayer.identity : ""
+    readonly property bool canGoNext: ready ? resolvedPlayer.canGoNext : false
+    readonly property bool canGoPrevious: ready ? resolvedPlayer.canGoPrevious : false
+    readonly property bool canPlay: ready ? resolvedPlayer.canPlay : false
+    readonly property bool canPause: ready ? resolvedPlayer.canPause : false
+    readonly property bool canSeek: ready ? resolvedPlayer.canSeek : false
+    readonly property bool canRaise: ready ? resolvedPlayer.canRaise : false
     // To know whether Shuffle and Loop can be changed we have to check if the property is defined,
     // unlike the other commands, LoopStatus and Shuffle do not have specific properties such as
     // CanPause, CanSeek, etc.
-    readonly property bool canChangeShuffle: ready ? mpris2Model.currentPlayer.shuffle !== undefined : false
-    readonly property bool canChangeLoopStatus: ready ? mpris2Model.currentPlayer.loopStatus !== undefined : false
+    readonly property bool canChangeShuffle: ready ? resolvedPlayer.shuffle !== undefined : false
+    readonly property bool canChangeLoopStatus: ready ? resolvedPlayer.loopStatus !== undefined : false
+
+    function normalizedEntry(value) {
+        return (value || "").toString().trim().toLowerCase();
+    }
+
+    function entriesMatch(left, right) {
+        const normalizedLeft = normalizedEntry(left);
+        const normalizedRight = normalizedEntry(right);
+        if (!normalizedLeft || !normalizedRight)
+            return false;
+
+        return normalizedLeft === normalizedRight;
+    }
+
+    function parseSourcePriority(value) {
+        return (value || "").split(",").map((entry) => {
+            return normalizedEntry(entry);
+        }).filter((entry) => {
+            return entry.length > 0;
+        });
+    }
+
+    function playerAt(row) {
+        if (!mpris2Model || row < 0 || row >= mpris2Model.rowCount())
+            return null;
+
+        return mpris2Model.data(mpris2Model.index(row, 0), containerRole);
+    }
+
+    function findPlayerByEntry(targetEntry) {
+        if (!targetEntry || !mpris2Model)
+            return null;
+
+        const playerCount = mpris2Model.rowCount();
+        for (let row = 0; row < playerCount; ++row) {
+            const player = playerAt(row);
+            if (player && entriesMatch(player.desktopEntry, targetEntry))
+                return player;
+
+        }
+        return null;
+    }
+
+    function resolvePlayer() {
+        modelRevision;
+        if (!mpris2Model)
+            return null;
+
+        for (const targetEntry of normalizedSourcePriority) {
+            const matchedPlayer = findPlayerByEntry(targetEntry);
+            if (matchedPlayer)
+                return matchedPlayer;
+
+        }
+        if (sourceWhitelist && normalizedSourcePriority.length > 0)
+            return null;
+
+        return mpris2Model.currentPlayer || null;
+    }
 
     function togglePlayPause() {
-        if (mpris2Model.currentPlayer)
-            mpris2Model.currentPlayer.PlayPause();
+        if (resolvedPlayer)
+            resolvedPlayer.PlayPause();
 
     }
 
     function setPosition(position) {
-        mpris2Model.currentPlayer.position = position;
+        if (resolvedPlayer)
+            resolvedPlayer.position = position;
+
     }
 
     function next() {
-        if (mpris2Model.currentPlayer)
-            mpris2Model.currentPlayer.Next();
+        if (resolvedPlayer)
+            resolvedPlayer.Next();
 
     }
 
     function previous() {
-        if (mpris2Model.currentPlayer)
-            mpris2Model.currentPlayer.Previous();
+        if (resolvedPlayer)
+            resolvedPlayer.Previous();
 
     }
 
     function updatePosition() {
-        if (mpris2Model.currentPlayer)
-            mpris2Model.currentPlayer.updatePosition();
+        if (resolvedPlayer)
+            resolvedPlayer.updatePosition();
 
     }
 
     function setVolume(volume) {
-        mpris2Model.currentPlayer.volume = volume;
+        if (resolvedPlayer)
+            resolvedPlayer.volume = volume;
+
     }
 
     function changeVolume(delta, showOSD) {
-        mpris2Model.currentPlayer.changeVolume(delta, showOSD);
+        if (resolvedPlayer)
+            resolvedPlayer.changeVolume(delta, showOSD);
+
     }
 
     function setShuffle(shuffle) {
-        mpris2Model.currentPlayer.shuffle = shuffle;
+        if (resolvedPlayer)
+            resolvedPlayer.shuffle = shuffle;
+
     }
 
     function setLoopStatus(loopStatus) {
-        mpris2Model.currentPlayer.loopStatus = loopStatus;
+        if (resolvedPlayer)
+            resolvedPlayer.loopStatus = loopStatus;
+
     }
 
     function raise() {
-        mpris2Model.currentPlayer.Raise();
+        if (resolvedPlayer)
+            resolvedPlayer.Raise();
+
     }
 
     function formatTrackTime(s) {
@@ -99,13 +176,11 @@ QtObject {
     }
 
     mpris2Model: Mpris.Mpris2Model {
-        onRowsInserted: (_, rowIndex) => {
-            const CONTAINER_ROLE = Qt.UserRole + 1;
-            const player = this.data(this.index(rowIndex, 0), CONTAINER_ROLE);
-            if (player.desktopEntry === root.sourceName)
-                this.currentIndex = rowIndex;
-
-        }
+        onRowsInserted: root.modelRevision += 1
+        onRowsRemoved: root.modelRevision += 1
+        onModelReset: root.modelRevision += 1
+        onDataChanged: root.modelRevision += 1
+        onCurrentPlayerChanged: root.modelRevision += 1
     }
 
 }

package/contents/ui/Representation.qml

@@ -33,7 +33,23 @@ MouseArea {
     readonly property bool hideNowPlayingArea: effectiveLabelVisibilityMode === "never"
     readonly property bool usesCustomBackground: configuredBackgroundStyle === "custom"
     readonly property int hideModeHorizontalPadding: 8
-    readonly property int labelRailWidth: 100
+    readonly property int contentInset: 8
+    readonly property int availableContentWidth: Math.max(0, width - contentInset * 2)
+    readonly property int separatorReservedWidth: nowPlayingLabelsVisible && !hideNowPlayingArea ? 1 + effectiveSeparatorGapLabel + effectiveSeparatorGapTrack : 0
+    readonly property int maxLabelRailSize: Math.max(0, availableContentWidth - separatorReservedWidth)
+    readonly property int labelRailSize: Math.max(0, Math.min(height - contentInset * 2, maxLabelRailSize))
+    readonly property bool mediaControlsTargetShown: mediaControlsEnabled && controlsHoverActive && nowPlayingLabelsVisible && !hideNowPlayingArea
+    readonly property int artworkControlsGap: configuredUseLabelArtwork && player.artUrl.length > 0 ? 2 : 0
+    readonly property real labelShrunkScale: labelRailSize > 0 ? Math.max(0, (labelRailSize - buttonSize - artworkControlsGap) / labelRailSize) : 1
+    property real labelContentScale: mediaControlsTargetShown ? labelShrunkScale : 1
+    readonly property real controlsReveal: {
+        const range = 1 - labelShrunkScale;
+        if (range <= 0)
+            return mediaControlsTargetShown ? 1 : 0;
+
+        return Math.max(0, Math.min(1, (1 - labelContentScale) / range));
+    }
+    readonly property real labelContentSize: labelRailSize * labelContentScale
     readonly property int effectiveImageBorderRadius: Math.max(0, configuredImageBorderRadius)
     readonly property string effectiveBackgroundColor: configuredBackgroundColor || "transparent"
     readonly property int effectiveBackgroundRadius: Math.max(0, configuredBackgroundRadius)
@@ -67,7 +83,7 @@ MouseArea {
     onRawHoverActiveChanged: {
         if (!mediaControlsMouseArea.mediaControlsEnabled) {
             hoverExitTimer.stop();
-            return ;
+            return;
         }
         if (rawHoverActive)
             hoverExitTimer.stop();
@@ -77,12 +93,11 @@ MouseArea {
     onMediaControlsEnabledChanged: {
         if (!mediaControlsMouseArea.mediaControlsEnabled)
             hoverExitTimer.stop();
-
     }
-    Keys.onPressed: (event) => {
+    Keys.onPressed: event => {
         if (!mediaControlsMouseArea.mediaControlsEnabled) {
             event.accepted = false;
-            return ;
+            return;
         }
         if (!event.modifiers) {
             event.accepted = true;
@@ -110,6 +125,13 @@ MouseArea {
         interval: 300
     }
 
+    Behavior on labelContentScale {
+        NumberAnimation {
+            duration: 250
+            easing.type: Easing.InOutQuad
+        }
+    }
+
     Rectangle {
         anchors.fill: parent
         visible: mediaControlsMouseArea.usesCustomBackground
@@ -119,75 +141,65 @@ MouseArea {
 
     RowLayout {
         anchors.fill: parent
+        anchors.margins: mediaControlsMouseArea.contentInset
         layoutDirection: mediaControlsMouseArea.labelsOnRight ? Qt.RightToLeft : Qt.LeftToRight
 
-        ColumnLayout {
+        Item {
             id: leftColumn
 
             visible: !mediaControlsMouseArea.hideNowPlayingArea
             Layout.fillHeight: true
-            Layout.minimumWidth: visible ? mediaControlsMouseArea.labelRailWidth : 0
-            Layout.preferredWidth: visible ? mediaControlsMouseArea.labelRailWidth : 0
-            Layout.maximumWidth: visible ? mediaControlsMouseArea.labelRailWidth : 0
-            states: [
-                State {
-                    name: "buttonsVisible"
-                    when: mediaControlsMouseArea.controlsHoverActive
-
-                    PropertyChanges {
-                        target: nowPlayingLabels
-                        Layout.bottomMargin: 10
-                    }
-
-                },
-                State {
-                    name: "buttonsHidden"
-                    when: !mediaControlsMouseArea.controlsHoverActive
-
-                    PropertyChanges {
-                        target: nowPlayingLabels
-                        Layout.bottomMargin: 0
-                    }
-
-                }
-            ]
+            Layout.minimumWidth: visible ? mediaControlsMouseArea.labelRailSize : 0
+            Layout.preferredWidth: visible ? mediaControlsMouseArea.labelRailSize : 0
+            Layout.maximumWidth: visible ? mediaControlsMouseArea.labelRailSize : 0
 
             Item {
-                Layout.fillHeight: true
-                Layout.fillWidth: true
-            }
+                id: labelSlot
 
-            ColumnLayout {
-                id: nowPlayingLabels
+                readonly property bool showsArtwork: mediaControlsMouseArea.configuredUseLabelArtwork && player.artUrl.length > 0
+                // Text is rasterized at whole pixel sizes, then lightly scaled between steps for smoother motion.
+                readonly property real textTargetFontSize: Math.max(1, mediaControlsMouseArea.effectiveLabelFontSize * mediaControlsMouseArea.labelContentScale)
+                readonly property int textRasterFontSize: Math.max(1, Math.round(textTargetFontSize))
+                readonly property real textResidualScale: textTargetFontSize / textRasterFontSize
 
-                Layout.alignment: mediaControlsMouseArea.labelsOnRight ? Qt.AlignLeft : Qt.AlignRight
-                Layout.fillWidth: true
+                x: mediaControlsMouseArea.labelsOnRight ? 0 : leftColumn.width - width
+                y: 0
+                width: mediaControlsMouseArea.labelContentSize
+                height: mediaControlsMouseArea.labelContentSize
+                clip: true
                 visible: mediaControlsMouseArea.nowPlayingLabelsVisible
 
                 LabelContent {
-                    Layout.alignment: mediaControlsMouseArea.labelsOnRight ? Qt.AlignLeft : Qt.AlignRight
-                    Layout.fillWidth: true
+                    anchors.left: parent.left
+                    anchors.top: parent.top
+                    width: labelSlot.showsArtwork ? mediaControlsMouseArea.labelRailSize : mediaControlsMouseArea.labelContentSize / labelSlot.textResidualScale
+                    height: labelSlot.showsArtwork ? mediaControlsMouseArea.labelRailSize : mediaControlsMouseArea.labelContentSize / labelSlot.textResidualScale
+                    scale: labelSlot.showsArtwork ? mediaControlsMouseArea.labelContentScale : labelSlot.textResidualScale
+                    transformOrigin: Item.TopLeft
                     artworkSource: mediaControlsMouseArea.configuredUseLabelArtwork ? player.artUrl : ""
                     labelLines: mediaControlsMouseArea.effectiveLabelLines
                     fontFamily: mediaControlsMouseArea.configuredFontFamily
-                    fontPixelSize: mediaControlsMouseArea.effectiveLabelFontSize
+                    fontPixelSize: labelSlot.showsArtwork ? mediaControlsMouseArea.effectiveLabelFontSize : labelSlot.textRasterFontSize
                     textColor: mediaControlsMouseArea.effectiveForegroundColor
                     textShadowEnabled: mediaControlsMouseArea.configuredTextShadowEnabled
                     verticalSpacing: mediaControlsMouseArea.effectiveLabelVerticalSpacing
                     horizontalAlignment: mediaControlsMouseArea.labelsOnRight ? Text.AlignLeft : Text.AlignRight
                     borderRadius: mediaControlsMouseArea.effectiveImageBorderRadius
-                    artworkSize: mediaControlsMouseArea.labelRailWidth
+                    artworkSize: labelSlot.showsArtwork ? mediaControlsMouseArea.labelRailSize : mediaControlsMouseArea.labelContentSize / labelSlot.textResidualScale
                 }
-
             }
 
             RowLayout {
                 id: mediaControls
 
-                Layout.alignment: mediaControlsMouseArea.labelsOnRight ? Qt.AlignLeft : Qt.AlignRight
-                enabled: mediaControlsMouseArea.mediaControlsEnabled && mediaControlsMouseArea.controlsHoverActive
-                opacity: mediaControlsMouseArea.mediaControlsEnabled && mediaControlsMouseArea.controlsHoverActive && mediaControlsMouseArea.nowPlayingLabelsVisible && !mediaControlsMouseArea.hideNowPlayingArea ? 1 : 0
-                visible: mediaControlsMouseArea.mediaControlsEnabled && mediaControlsMouseArea.controlsHoverActive && mediaControlsMouseArea.nowPlayingLabelsVisible && !mediaControlsMouseArea.hideNowPlayingArea
+                x: mediaControlsMouseArea.labelsOnRight ? 0 : leftColumn.width - width
+                y: mediaControlsMouseArea.labelContentSize + mediaControlsMouseArea.artworkControlsGap
+                width: implicitWidth
+                height: mediaControlsMouseArea.buttonSize
+                clip: true
+                enabled: mediaControlsMouseArea.mediaControlsTargetShown
+                opacity: mediaControlsMouseArea.controlsReveal
+                visible: mediaControlsMouseArea.mediaControlsTargetShown || opacity > 0
 
                 QQC2.Button {
                     Layout.preferredWidth: buttonSize
@@ -203,7 +215,6 @@ MouseArea {
                         source: "media-skip-backward"
                         color: mediaControlsMouseArea.effectiveForegroundColor
                     }
-
                 }
 
                 QQC2.Button {
@@ -222,7 +233,6 @@ MouseArea {
                         source: player.playbackStatus === 2 ? "media-playback-pause" : "media-playback-start"
                         color: mediaControlsMouseArea.effectiveForegroundColor
                     }
-
                 }
 
                 QQC2.Button {
@@ -236,33 +246,8 @@ MouseArea {
                         source: "media-skip-forward"
                         color: mediaControlsMouseArea.effectiveForegroundColor
                     }
-
                 }
-
-                Behavior on opacity {
-                    PropertyAnimation {
-                        duration: 250
-                        easing.type: Easing.InOutQuad
-                    }
-
-                }
-
             }
-
-            Item {
-                Layout.fillHeight: true
-                Layout.fillWidth: true
-            }
-
-            transitions: Transition {
-                NumberAnimation {
-                    duration: 250
-                    easing.type: Easing.InOutQuad
-                    properties: "Layout.bottomMargin"
-                }
-
-            }
-
         }
 
         Item {
@@ -283,7 +268,6 @@ MouseArea {
                 height: Math.round(parent.height * mediaControlsMouseArea.effectiveSeparatorHeight / 100)
                 color: mediaControlsMouseArea.configuredHideSeparator ? "transparent" : mediaControlsMouseArea.effectiveForegroundColor
             }
-
         }
 
         ColumnLayout {
@@ -320,9 +304,6 @@ MouseArea {
                 elide: Text.ElideRight
                 horizontalAlignment: mediaControlsMouseArea.labelsOnRight ? Text.AlignRight : Text.AlignLeft
             }
-
         }
-
     }
-
 }

package/contents/ui/configGeneral.qml

@@ -4,6 +4,7 @@ import QtQuick.Dialogs as Dialogs
 import QtQuick.Layouts
 import org.kde.kcmutils as KCM
 import org.kde.kirigami as Kirigami
+import org.kde.plasma.private.mpris as Mpris
 
 KCM.SimpleKCM {
     id: configRoot
@@ -24,13 +25,17 @@ KCM.SimpleKCM {
     property alias cfg_foregroundColor: foregroundColorField.text
     property alias cfg_textShadowEnabled: textShadowCheckBox.checked
     property alias cfg_showMediaControls: showMediaControlsCheckBox.checked
+    property alias cfg_sourcePriority: sourcePriorityField.text
+    property alias cfg_sourceWhitelist: sourceWhitelistCheckBox.checked
     property alias cfg_trackTextVerticalSpacing: trackTextVerticalSpacingSpinBox.value
     property alias cfg_labelVerticalSpacing: labelVerticalSpacingSpinBox.value
     property alias cfg_separatorGapLabel: separatorGapLabelSpinBox.value
     property alias cfg_separatorGapTrack: separatorGapTrackSpinBox.value
     property alias cfg_separatorHeight: separatorHeightSpinBox.value
     property alias cfg_hideSeparator: hideSeparatorCheckBox.checked
+    readonly property int containerRole: Qt.UserRole + 1
     readonly property var availableFonts: Qt.fontFamilies()
+    property var detectedSources: []
     readonly property var labelVisibilityOptions: [{
         "text": i18n("Auto hide when idle"),
         "value": "auto"
@@ -55,6 +60,9 @@ KCM.SimpleKCM {
         "text": i18n("Solid background"),
         "value": "default"
     }]
+    readonly property bool hasSourcePriorityEntries: sourcePriorityField.text.split(",").some((entry) => {
+        return normalizeDesktopEntry(entry).length > 0;
+    })
 
     function syncComboByValue(comboBox, options, configuredValue, fallbackValue) {
         const requestedValue = configuredValue || fallbackValue;
@@ -71,6 +79,29 @@ KCM.SimpleKCM {
         return options[resolvedIndex].value;
     }
 
+    function normalizeDesktopEntry(value) {
+        return (value || "").toString().trim();
+    }
+
+    function refreshDetectedSources() {
+        const sources = [];
+        const seen = {
+        };
+        const playerCount = detectedSourcesModel.rowCount();
+        for (let row = 0; row < playerCount; ++row) {
+            const player = detectedSourcesModel.data(detectedSourcesModel.index(row, 0), containerRole);
+            const desktopEntry = normalizeDesktopEntry(player ? player.desktopEntry : "");
+            const desktopEntryKey = desktopEntry.toLowerCase();
+            if (!desktopEntry || seen[desktopEntryKey])
+                continue;
+
+            seen[desktopEntryKey] = true;
+            sources.push(desktopEntry);
+        }
+        detectedSources = sources;
+    }
+
+    Component.onCompleted: cfg_sourceWhitelist = hasSourcePriorityEntries && cfg_sourceWhitelist
     onCfg_fontFamilyChanged: {
         const index = availableFonts.indexOf(cfg_fontFamily);
         if (index >= 0 && fontFamilyComboBox.currentIndex !== index)
@@ -191,6 +222,34 @@ KCM.SimpleKCM {
             text: i18n("Show media controls")
         }
 
+        QQC2.TextField {
+            id: sourcePriorityField
+
+            Kirigami.FormData.label: i18n("Source priority:")
+            Layout.fillWidth: true
+            placeholderText: i18n("example: spotify, firefox")
+            onTextChanged: configRoot.cfg_sourceWhitelist = configRoot.hasSourcePriorityEntries && configRoot.cfg_sourceWhitelist
+        }
+
+        QQC2.CheckBox {
+            id: sourceWhitelistCheckBox
+
+            Kirigami.FormData.label: ""
+            text: i18n("Only use listed sources")
+            enabled: configRoot.hasSourcePriorityEntries
+        }
+
+        QQC2.Label {
+            id: detectedSourcesField
+
+            Kirigami.FormData.label: i18n("Current sources being detected:")
+            Layout.fillWidth: true
+            Layout.preferredHeight: Math.max(implicitHeight, Kirigami.Units.gridUnit * 2)
+            textFormat: TextEdit.PlainText
+            wrapMode: TextEdit.WrapAnywhere
+            text: configRoot.detectedSources.length > 0 ? configRoot.detectedSources.join("\n") : i18n("No active MPRIS desktopEntry values detected")
+        }
+
         QQC2.SpinBox {
             id: separatorHeightSpinBox
 
@@ -333,6 +392,16 @@ KCM.SimpleKCM {
         onAccepted: configRoot.cfg_foregroundColor = selectedColor.toString()
     }
 
+    Mpris.Mpris2Model {
+        id: detectedSourcesModel
+
+        onRowsInserted: configRoot.refreshDetectedSources()
+        onRowsRemoved: configRoot.refreshDetectedSources()
+        onModelReset: configRoot.refreshDetectedSources()
+        onDataChanged: configRoot.refreshDetectedSources()
+        Component.onCompleted: configRoot.refreshDetectedSources()
+    }
+
     component SectionHeader: Item {
         required property string title
 

package/contents/ui/main.qml

@@ -43,6 +43,10 @@ PlasmoidItem {
     // qmllint disable missing-property
     property bool configuredShowMediaControls: plasmoid.configuration.showMediaControls
     // qmllint disable missing-property
+    property string configuredSourcePriority: plasmoid.configuration.sourcePriority
+    // qmllint disable missing-property
+    property bool configuredSourceWhitelist: plasmoid.configuration.sourceWhitelist
+    // qmllint disable missing-property
     property int configuredTrackTextVerticalSpacing: plasmoid.configuration.trackTextVerticalSpacing
     // qmllint disable missing-property
     property int configuredLabelVerticalSpacing: plasmoid.configuration.labelVerticalSpacing
@@ -73,6 +77,9 @@ PlasmoidItem {
 
     Player {
         id: player
+
+        sourcePriority: root.configuredSourcePriority
+        sourceWhitelist: root.configuredSourceWhitelist
     }
 
     fullRepresentation: Representation {