Periodically save current playlist tab

Building on the previous commit, we save the current playlist (tab)
periodically as well.

Signed-off-by: Antonio Russo <antonio.e.russo@gmail.com>

src/playlist/playlistcontainer.cpp

@@ -16,6 +16,7 @@
 */
 
 #include "core/appearance.h"
+#include "core/application.h"
 #include "core/logging.h"
 #include "core/player.h"
 #include "core/timeconstants.h"
@@ -43,6 +44,7 @@ const int PlaylistContainer::kFilterDelayPlaylistSizeThreshold = 5000;
 
 PlaylistContainer::PlaylistContainer(QWidget* parent)
     : QWidget(parent),
+      app_(nullptr),
       ui_(new Ui_PlaylistContainer),
       manager_(nullptr),
       undo_(nullptr),
@@ -52,7 +54,8 @@ PlaylistContainer::PlaylistContainer(QWidget* parent)
       tab_bar_visible_(false),
       tab_bar_animation_(new QTimeLine(500, this)),
       no_matches_label_(nullptr),
-      filter_timer_(new QTimer(this)) {
+      filter_timer_(new QTimer(this)),
+      dirty_(false) {
   ui_->setupUi(this);
 
   no_matches_label_ = new QLabel(ui_->playlist);
@@ -96,6 +99,7 @@ PlaylistContainer::PlaylistContainer(QWidget* parent)
   ui_->tab_bar->setMaximumHeight(0);
 
   // Connections
+  connect(ui_->tab_bar, SIGNAL(currentChanged(int)), SLOT(DirtyTabBar()));
   connect(ui_->tab_bar, SIGNAL(Save(int)), SLOT(SavePlaylist(int)));
 
   // set up timer for delayed filter updates
@@ -111,10 +115,17 @@ PlaylistContainer::PlaylistContainer(QWidget* parent)
 }
 
 PlaylistContainer::~PlaylistContainer() {
-  Save();
   delete ui_;
 }
 
+void PlaylistContainer::SetApplication(Application* app) {
+  Q_ASSERT(app);
+  app_ = app;
+  SetManager(app_->playlist_manager());
+  ui_->playlist->SetApplication(app_);
+  connect(app_, SIGNAL(SaveSettings(QSettings*)), SLOT(Save(QSettings*)));
+}
+
 PlaylistView* PlaylistContainer::view() const { return ui_->playlist; }
 
 void PlaylistContainer::SetActions(QAction* new_playlist,
@@ -334,10 +345,18 @@ void PlaylistContainer::GoToPreviousPlaylistTab() {
   manager_->SetCurrentPlaylist(id_previous);
 }
 
-void PlaylistContainer::Save() {
-  if (starting_up_) return;
+void PlaylistContainer::DirtyTabBar() {
+  dirty_ = true;
+  app_->DirtySettings();
+}
 
-  settings_.setValue("current_playlist", ui_->tab_bar->current_id());
+void PlaylistContainer::Save(QSettings* settings_) {
+  if (starting_up_ || !dirty_) return;
+  dirty_ = false;
+
+  settings_->beginGroup(kSettingsGroup);
+  settings_->setValue("current_playlist", ui_->tab_bar->current_id());
+  settings_->endGroup();
 }
 
 void PlaylistContainer::SetTabBarVisible(bool visible) {

src/playlist/playlistcontainer.h

@@ -23,6 +23,7 @@
 
 class Ui_PlaylistContainer;
 
+class Application;
 class LineEditInterface;
 class Playlist;
 class PlaylistManager;
@@ -41,6 +42,7 @@ class PlaylistContainer : public QWidget {
 
   static const char* kSettingsGroup;
 
+  void SetApplication(Application* app);
   void SetActions(QAction* new_playlist, QAction* load_playlist,
                   QAction* save_playlist, QAction* next_playlist,
                   QAction* previous_playlist);
@@ -83,7 +85,8 @@ signals:
   void ActivePaused();
   void ActiveStopped();
 
-  void Save();
+  void DirtyTabBar();
+  void Save(QSettings* settings_);
 
   void SetTabBarVisible(bool visible);
   void SetTabBarHeight(int height);
@@ -103,6 +106,7 @@ signals:
   static const int kFilterDelayMs;
   static const int kFilterDelayPlaylistSizeThreshold;
 
+  Application* app_;
   Ui_PlaylistContainer* ui_;
 
   PlaylistManager* manager_;
@@ -119,6 +123,8 @@ signals:
   QLabel* no_matches_label_;
 
   QTimer* filter_timer_;
+
+  bool dirty_;
 };
 
 #endif  // PLAYLISTCONTAINER_H

src/ui/mainwindow.cpp

@@ -325,8 +325,7 @@ MainWindow::MainWindow(Application* app, SystemTrayIcon* tray_icon, OSD* osd,
 
   connect(ui_->playlist, SIGNAL(ViewSelectionModelChanged()),
           SLOT(PlaylistViewSelectionModelChanged()));
-  ui_->playlist->SetManager(app_->playlist_manager());
-  ui_->playlist->view()->SetApplication(app_);
+  ui_->playlist->SetApplication(app_);
 
   library_view_->view()->setModel(library_sort_model_);
   library_view_->view()->SetApplication(app_);