Only show delete and save playlist button when item is selected

Fixes #500

src/playlist/playlistlistcontainer.cpp

@@ -116,6 +116,7 @@ PlaylistListContainer::PlaylistListContainer(QWidget *parent)
   proxy_->sort(0);
   ui_->tree->setModel(proxy_);
 
+  connect(ui_->tree, SIGNAL(ItemsSelectedChanged(bool)), SLOT(ItemsSelectedChanged(bool)));
   connect(ui_->tree, SIGNAL(doubleClicked(QModelIndex)), SLOT(ItemDoubleClicked(QModelIndex)));
 
   model_->invisibleRootItem()->setData(PlaylistListModel::Type_Folder, PlaylistListModel::Role_Type);
@@ -168,6 +169,9 @@ void PlaylistListContainer::ReloadSettings() {
 
 void PlaylistListContainer::showEvent(QShowEvent *e) {
 
+  ui_->remove->setEnabled(ui_->tree->ItemsSelected());
+  ui_->save_playlist->setEnabled(ui_->tree->ItemsSelected());
+
   // Loading icons is expensive so only do it when the view is first opened
   if (loaded_icons_) {
     QWidget::showEvent(e);
@@ -331,6 +335,11 @@ void PlaylistListContainer::PlaylistPathChanged(int id, const QString &new_path)
 
 }
 
+void PlaylistListContainer::ItemsSelectedChanged(const bool selected) {
+  ui_->remove->setEnabled(selected);
+  ui_->save_playlist->setEnabled(selected);
+}
+
 void PlaylistListContainer::ItemDoubleClicked(const QModelIndex &proxy_index) {
 
   const QModelIndex &index = proxy_->mapToSource(proxy_index);
@@ -342,8 +351,7 @@ void PlaylistListContainer::ItemDoubleClicked(const QModelIndex &proxy_index) {
 
 }
 
-void PlaylistListContainer::CopyToDevice()
+void PlaylistListContainer::CopyToDevice() {
-{
 #ifndef Q_OS_WIN
   // Reuse the organize dialog, but set the detail about the playlist name
   if (!organize_dialog_) {

src/playlist/playlistlistcontainer.h

@@ -83,7 +83,9 @@ class PlaylistListContainer : public QWidget {
   void ActivePaused();
   void ActiveStopped();
 
-private:
+  void ItemsSelectedChanged(const bool selected);
+
+ private:
   QStandardItem *ItemForPlaylist(const QString &name, int id);
   QStandardItem *ItemForFolder(const QString &name) const;
   void RecursivelySetIcons(QStandardItem *parent) const;

src/playlist/playlistlistview.cpp

@@ -56,3 +56,11 @@ void PlaylistListView::paintEvent(QPaintEvent *event) {
     AutoExpandingTreeView::paintEvent(event);
   }
 }
+
+bool PlaylistListView::ItemsSelected() const {
+  return selectionModel()->selectedRows().count() > 0;
+}
+
+void PlaylistListView::selectionChanged(const QItemSelection&, const QItemSelection&) {
+  emit ItemsSelectedChanged(selectionModel()->selectedRows().count() > 0);
+}

src/playlist/playlistlistview.h

@@ -37,9 +37,15 @@ class PlaylistListView : public AutoExpandingTreeView {
  public:
   explicit PlaylistListView(QWidget *parent = nullptr);
 
+  bool ItemsSelected() const;
+
+ signals:
+  void ItemsSelectedChanged(bool);
+
  protected:
   // QWidget
   void paintEvent(QPaintEvent *event) override;
+  void selectionChanged(const QItemSelection&, const QItemSelection&) override;
 };
 
 #endif  // PLAYLISTVIEW_H