playlist handling

SongListModel.cpp

@@ -1,10 +1,13 @@
 #include "SongListModel.h"
+#include <QApplication>
 #include <QTime>
 #include <QRandomGenerator>
 #include <QDebug>
+#include <QFont>
 
 SongListModel::SongListModel(QObject *parent)
-    : QAbstractListModel(parent)
+    : QAbstractTableModel(parent),
+      m_playingIndex(-1)
 {
 }
 
@@ -15,6 +18,12 @@ int SongListModel::rowCount(const QModelIndex &parent) const
     return songList.size();
 }
 
+int SongListModel::columnCount(const QModelIndex &parent) const
+{
+    // We have 2 columns: play indicator and song name
+    return 2;
+}
+
 QVariant SongListModel::data(const QModelIndex &index, int role) const
 {
     if (!index.isValid() || index.row() >= songList.size())
@@ -24,13 +33,40 @@ QVariant SongListModel::data(const QModelIndex &index, int role) const
     
     switch (role) {
     case Qt::DisplayRole:
+        // Column 0: Play indicator column
+        if (index.column() == 0) {
+            return index.row() == m_playingIndex ? "▶" : "";
+        }
+        // Column 1: Song name
+        else if (index.column() == 1) {
+            return song.caption;
+        }
+        break;
+    case Qt::FontRole:
+        // Make play indicator bold and larger
+        if (index.column() == 0 && index.row() == m_playingIndex) {
+            QFont font = QApplication::font();
+            font.setBold(true);
+            return font;
+        }
+        break;
+    case Qt::TextAlignmentRole:
+        // Center align the play indicator
+        if (index.column() == 0) {
+            return Qt::AlignCenter;
+        }
+        break;
     case CaptionRole:
         return song.caption;
     case LyricsRole:
         return song.lyrics;
+    case IsPlayingRole:
+        return index.row() == m_playingIndex;
     default:
         return QVariant();
     }
+    
+    return QVariant();
 }
 
 bool SongListModel::setData(const QModelIndex &index, const QVariant &value, int role)
@@ -88,6 +124,30 @@ SongItem SongListModel::getSong(int index) const
     return SongItem();
 }
 
+QVariant SongListModel::headerData(int section, Qt::Orientation orientation, int role) const
+{
+    if (role == Qt::DisplayRole && orientation == Qt::Horizontal) {
+        // Hide headers since we don't need column titles
+        return QVariant();
+    }
+    return QAbstractTableModel::headerData(section, orientation, role);
+}
+
+void SongListModel::setPlayingIndex(int index)
+{
+    int oldPlayingIndex = m_playingIndex;
+    m_playingIndex = index;
+    
+    // Update both the old and new playing indices to trigger UI updates
+    if (oldPlayingIndex >= 0 && oldPlayingIndex < songList.size()) {
+        emit dataChanged(this->index(oldPlayingIndex, 0), this->index(oldPlayingIndex, 0));
+    }
+    
+    if (index >= 0 && index < songList.size()) {
+        emit dataChanged(this->index(index, 0), this->index(index, 0));
+    }
+}
+
 int SongListModel::findNextIndex(int currentIndex, bool shuffle) const
 {
     if (songList.isEmpty())