Add arrow button in track targets to switch stream

src/timeline2/view/qml/TrackHead.qml

@@ -101,7 +101,7 @@ Rectangle {
         }
         width: 2 * fontMetrics.boundingRect("M").width
         height: trackHeadRoot.height
-        verticalAlignment: Text.AlignVCenter
+        verticalAlignment: Text.AlignTop
         horizontalAlignment: Text.AlignHCenter
         visible: trackHeadRoot.isAudio ? timeline.hasAudioTarget > 0 : timeline.hasVideoTarget
         anchors.top: parent.top
@@ -134,6 +134,26 @@ Rectangle {
                     }
                 }
             }
+            ToolButton {
+                focusPolicy: Qt.NoFocus
+                visible: trackHeadRoot.isAudio && timeline.clipTargets > 1 && trackHeadRoot.height > (2 * expandButton.height)
+                background: Rectangle {
+                    color: Qt.darker(trackTarget.bgColor, 1.5)
+                    border.color: activePalette.light
+                }
+                anchors.bottom: parent.bottom
+                width: parent.width
+                height: width
+                contentItem: Item {
+                    Image {
+                        source: "image://icon/go-down"
+                        anchors.fill: parent
+                    }
+                }
+                onClicked: {
+                    root.showTargetMenu(trackId)
+                }
+            }
         }
         ToolTip {
             visible: targetArea.containsMouse

src/timeline2/view/timelinecontroller.cpp

@@ -2553,6 +2553,11 @@ int TimelineController::hasAudioTarget() const
     return m_hasAudioTarget;
 }
 
+int TimelineController::clipTargets() const
+{
+    return m_model->m_binAudioTargets.size();
+}
+
 bool TimelineController::hasVideoTarget() const
 {
     return m_hasVideoTarget;

src/timeline2/view/timelinecontroller.h

@@ -69,6 +69,7 @@ class TimelineController : public QObject
 
     Q_PROPERTY(int hasAudioTarget READ hasAudioTarget NOTIFY hasAudioTargetChanged)
     Q_PROPERTY(bool hasVideoTarget READ hasVideoTarget NOTIFY hasVideoTargetChanged)
+    Q_PROPERTY(int clipTargets READ clipTargets NOTIFY hasAudioTargetChanged)
     Q_PROPERTY(bool autoScroll READ autoScroll NOTIFY autoScrollChanged)
     Q_PROPERTY(QColor videoColor READ videoColor NOTIFY colorsChanged)
     Q_PROPERTY(QColor audioColor READ audioColor NOTIFY colorsChanged)
@@ -155,6 +156,7 @@ public:
     Q_INVOKABLE const QString audioTargetName(int tid) const;
     Q_INVOKABLE int videoTarget() const;
     Q_INVOKABLE int hasAudioTarget() const;
+    Q_INVOKABLE int clipTargets() const;
     Q_INVOKABLE bool hasVideoTarget() const;
     Q_INVOKABLE bool autoScroll() const;
     Q_INVOKABLE int activeTrack() const { return m_activeTrack; }