ui: save settings on a timer

The QSettings IO is damn slow on Windows. Save only after five seconds
have elapsed with nothing being changed.

2 files changed, 16 insertions, 3 deletions

diff --git a/facetracknoir/ui.cpp b/facetracknoir/ui.cpp
index 0876c848..6437b9d1 100644
--- a/facetracknoir/ui.cpp
+++ b/facetracknoir/ui.cpp
@@ -76,6 +76,9 @@ MainWindow::MainWindow() :
     connect(&pose_update_timer, SIGNAL(timeout()), this, SLOT(showHeadPose()));
     connect(&kbd_quit, SIGNAL(activated()), this, SLOT(exit()));
 
+    save_timer.setSingleShot(true);
+    connect(&save_timer, SIGNAL(timeout()), this, SLOT(_save()));
+
     profile_menu.addAction("Create new empty config", this, SLOT(make_empty_config()));
     profile_menu.addAction("Create new copied config", this, SLOT(make_copied_config()));
     profile_menu.addAction("Open configuration directory", this, SLOT(open_config_directory()));
@@ -116,10 +119,12 @@ bool MainWindow::get_new_config_name_from_dialog(QString& ret)
 
 MainWindow::~MainWindow()
 {
+    save_timer.stop();
+
     if (tray)
         tray->hide();
     stopTracker();
-    save();
+    _save();
 }
 
 void MainWindow::set_working_directory()
@@ -131,7 +136,13 @@ void MainWindow::save_mappings() {
     pose.save_mappings();
 }
 
-void MainWindow::save() {
+void MainWindow::save()
+{
+    save_timer.stop();
+    save_timer.start(5000);
+}
+
+void MainWindow::_save() {
     s.b->save();
     save_mappings();
     mem<QSettings> settings = group::ini_file();
diff --git a/facetracknoir/ui.h b/facetracknoir/ui.h
index 65a7647a..cfaf47cb 100644
--- a/facetracknoir/ui.h
+++ b/facetracknoir/ui.h
@@ -51,6 +51,7 @@ class MainWindow : public QMainWindow, private State
     process_detector_worker det;
     QMenu profile_menu;
     bool is_refreshing_profiles;
+    QTimer save_timer;
 
     mem<dylib> current_tracker()
     {
@@ -72,10 +73,11 @@ class MainWindow : public QMainWindow, private State
     void display_pose(const double* mapped, const double* raw);
     void ensure_tray();
     void set_title(const QString& game_title = QStringLiteral(""));
-    void save();
     static bool get_new_config_name_from_dialog(QString &ret);
     void set_profile(const QString& profile);
 private slots:
+    void _save();
+    void save();
     void exit();
     void profileSelected(QString name);