implemented playlist contents interactive dragging

backend_xmmsclient++/playlistmodel.cpp

@@ -214,8 +214,8 @@ PlaylistModel::handle_change (const Xmms::Dict &chg)
 			m_plist.insert (npos, id);
 			endInsertRows ();
 
-			if (pos < npos && pos)
-				pos --;
+			//if (pos < npos && pos)
+			//	pos --;
 
 			emit entryMoved (index (pos, 0), index (npos, 0));
 

src/playlist/playlistview.cpp

@@ -123,7 +123,7 @@ PlaylistView::PlaylistView (QWidget *parent) : QListView (parent)
 
 	setSelectionMode (QAbstractItemView::ExtendedSelection);
 	setUniformItemSizes(true);
-	setDragEnabled(true);
+	//setDragEnabled(true);
 	setAcceptDrops(true);
 
 	// TODO make sure delegate gets deleted
@@ -142,6 +142,7 @@ PlaylistView::PlaylistView (QWidget *parent) : QListView (parent)
 
 	connect (client->xplayback (), SIGNAL(playbackStatusChanged(Xmms::Playback::Status)),
 	         this, SLOT(handleStatus(Xmms::Playback::Status)));
+
 }
 
 void
@@ -312,6 +313,104 @@ PlaylistView::mouseDoubleClickEvent (QMouseEvent *event)
 	}
 }
 
+void
+PlaylistView::mouseMoveEvent (QMouseEvent *event)
+{
+	if (event->buttons () != Qt::LeftButton)
+		return;
+
+
+	QModelIndex mouseIndex = indexAt (event->pos ());
+	QModelIndexList sel = selectedIndexes ();
+
+	if (mouseIndex.row () < 0 || sel.empty())
+		return;
+	
+	if (mouseIndex != currentIndex () && m_old_selection.empty()) {
+		m_old_current_index = currentIndex ().row();
+
+		qSort(sel);
+
+		int diff = mouseIndex.row () - currentIndex ().row ();
+		if (!(sel.first().row () + diff >= 0) || 
+			!(sel.last ().row () + diff < model ()->rowCount ()))
+			return;
+
+		if (diff < 0 ) {
+			// move selection up
+			for (int i = 0; i < sel.size (); i++) {
+				int row = sel[i].row();
+				int nrow = row + diff;
+
+				App->client ()->playlist ()->moveEntry (row, nrow);
+				m_old_selection.insert(row);
+			}
+		} else {
+			// move selection down
+			for (int i = sel.size () - 1; i >= 0; i--) {
+				int row = sel[i].row();
+				int nrow = row + diff;
+
+				App->client ()->playlist ()->moveEntry (row, nrow);
+				m_old_selection.insert(row);
+			}
+		}
+		setSelectionMode (QAbstractItemView::NoSelection);
+		setCurrentIndex(mouseIndex);
+		setSelectionMode (QAbstractItemView::ExtendedSelection);
+	}
+
+
+	/*
+
+	QRect r = visualRect(currentIndex ());
+	int y = event->pos ().y();
+	if (!(y >= r.y () && 
+		  y <= r.y () + r.height ())) {
+
+		m_old_selection.clear();
+		m_old_current_index = currentIndex ().row();
+
+		QModelIndexList sel = selectedIndexes ();
+		qSort(sel);
+
+		if (y < r.y ()) {
+			// move selection up
+			for (int i = 0; i < sel.size (); i++) {
+				int row = sel[i].row();
+				//qDebug() << "moving " << row << "to" << row - 1;
+				App->client ()->playlist ()->moveEntry (row, row - 1);
+
+				m_old_selection.insert(row);
+			}
+		} else {
+			// move selection down
+			for (int i = sel.size () - 1; i >= 0; i--) {
+				int row = sel[i].row();
+				//qDebug() << "moving " << row << "to" << row + 1;
+				App->client ()->playlist ()->moveEntry (row, row + 1);
+
+				m_old_selection.insert(row);
+			}
+		}
+	}
+	*/
+}
+
+void 
+PlaylistView::entryMoved(QModelIndex a, QModelIndex b)
+{
+	if (m_old_selection.contains (a.row())) {
+		selectionModel ()->select (b, QItemSelectionModel::Select);
+		m_old_selection.remove (a.row());
+	    if (m_old_current_index == a.row ()) {
+			setSelectionMode (QAbstractItemView::NoSelection);
+			setCurrentIndex (b);
+			setSelectionMode (QAbstractItemView::ExtendedSelection);
+		}
+	}
+}
+
 void
 PlaylistView::showEntryInfo (void)
 {

src/playlist/playlistview.h

@@ -26,6 +26,7 @@ class PlaylistModel;
 #include <QAbstractItemDelegate>
 #include <QListView>
 #include <QPointer>
+#include <QSet>
 class QWidget;
 class QModelIndex;
 
@@ -69,9 +70,11 @@ class PlaylistView : public QListView {
 		void settingsChanged (void);
 		void setPixmaps (Skin *skin);
 		void currentPosChanged (QModelIndex);
+		void entryMoved(QModelIndex, QModelIndex);
 
 	protected:
 		void mouseDoubleClickEvent (QMouseEvent *event);
+		void mouseMoveEvent (QMouseEvent *event);
 
 	protected slots:
 		void selectionChanged (const QItemSelection &, const QItemSelection &);
@@ -85,6 +88,9 @@ class PlaylistView : public QListView {
 		QColor m_color_normal;
 		QColor m_color_normal_bg;
 		QPointer<EntryInfo> m_entry_info;
+
+		QSet<int> m_old_selection;
+		int m_old_current_index;
 };
 
 

src/playlist/playlistwidget.cpp

@@ -196,6 +196,11 @@ PlaylistWidget::PlaylistWidget (PlaylistWindow *parent) : QWidget (parent)
 	// TODO: creation of Playlistmodel should be done elsewhere
 	m_view->setModel (App->client ()->active_playlist ());
 
+	connect (App->client ()->active_playlist (), 
+			SIGNAL(entryMoved (QModelIndex, QModelIndex)),
+			m_view, 
+			SLOT (entryMoved (QModelIndex, QModelIndex)));
+
 	/*
 	 * This is a hack to make PlaylistScrollBar work with PlaylistView.
 	 * It is necessery because of limitations and at least one Bug in the