refactor(UI): prepare for chapter support on seekbar

playbackprogressindicator.h

@@ -0,0 +1,52 @@
+// SPDX-FileCopyrightText: 2025 Gary Wang <git@blumia.net>
+//
+// SPDX-License-Identifier: MIT
+
+#pragma once
+
+#include <QWidget>
+#include <QMouseEvent>
+#include <QStandardItemModel>
+
+class PlaybackProgressIndicator : public QWidget
+{
+    Q_OBJECT
+
+    Q_PROPERTY(bool seekOnMove MEMBER m_seekOnMove NOTIFY seekOnMoveChanged)
+    Q_PROPERTY(qint64 position MEMBER m_position NOTIFY positionChanged)
+    Q_PROPERTY(qint64 duration MEMBER m_duration NOTIFY durationChanged)
+public:
+    enum Roles {
+        ChapterTitleRole = Qt::DisplayRole,
+        StartTimeMsRole = Qt::UserRole + 1,
+    };
+
+    explicit PlaybackProgressIndicator(QWidget *parent = nullptr);
+    ~PlaybackProgressIndicator() = default;
+
+    void setPosition(qint64 pos);
+    void setDuration(qint64 dur);
+    void setChapters(QList<std::pair<qint64, QString>> chapters);
+
+signals:
+    void seekOnMoveChanged(bool sow);
+    void positionChanged(qint64 newPosition);
+    void durationChanged(qint64 newDuration);
+    void seekingRequested(qint64 position);
+
+public slots:
+
+protected:
+    void paintEvent(QPaintEvent *event) override;
+    void mousePressEvent(QMouseEvent *event) override;
+    void mouseMoveEvent(QMouseEvent *event) override;
+    void mouseReleaseEvent(QMouseEvent *event) override;
+
+private:
+    bool m_seekOnMove = true;
+    qint64 m_position = -1;
+    qint64 m_seekingPosition = -1;
+    qint64 m_duration = -1;
+    QStandardItemModel m_chapterModel;
+};
+