cabana: improve open/save functions (#27007)

tools/cabana/mainwin.cc

@@ -68,13 +68,14 @@ MainWindow::MainWindow() : QMainWindow() {
 
 void MainWindow::createActions() {
   QMenu *file_menu = menuBar()->addMenu(tr("&File"));
-  file_menu->addAction(tr("Open DBC File..."), this, &MainWindow::loadDBCFromFile);
+  file_menu->addAction(tr("Open DBC File..."), this, &MainWindow::loadDBCFromFile)->setShortcuts(QKeySequence::Open);
   file_menu->addAction(tr("Load DBC From Clipboard"), this, &MainWindow::loadDBCFromClipboard);
   file_menu->addSeparator();
-  file_menu->addAction(tr("Save DBC As..."), this, &MainWindow::saveDBCToFile);
+  file_menu->addAction(tr("Save DBC..."), this, &MainWindow::saveDBCToFile)->setShortcuts(QKeySequence::Save);
+  file_menu->addAction(tr("Save DBC As..."), this, &MainWindow::saveAsDBCToFile)->setShortcuts(QKeySequence::SaveAs);
   file_menu->addAction(tr("Copy DBC To Clipboard"), this, &MainWindow::saveDBCToClipboard);
   file_menu->addSeparator();
-  file_menu->addAction(tr("Settings..."), this, &MainWindow::setOption);
+  file_menu->addAction(tr("Settings..."), this, &MainWindow::setOption)->setShortcuts(QKeySequence::Preferences);
 
   QMenu *edit_menu = menuBar()->addMenu(tr("&Edit"));
   auto undo_act = detail_widget->undo_stack->createUndoAction(this, tr("&Undo"));
@@ -182,7 +183,7 @@ void MainWindow::loadDBCFromName(const QString &name) {
 }
 
 void MainWindow::loadDBCFromFile() {
-  QString file_name = QFileDialog::getOpenFileName(this, tr("Open File"), settings.last_dir, "DBC (*.dbc)");
+  file_name = QFileDialog::getOpenFileName(this, tr("Open File"), settings.last_dir, "DBC (*.dbc)");
   if (!file_name.isEmpty()) {
     settings.last_dir = QFileInfo(file_name).absolutePath();
     QFile file(file_name);
@@ -213,18 +214,24 @@ void MainWindow::loadDBCFromFingerprint() {
 }
 
 void MainWindow::saveDBCToFile() {
-  QString file_name = QFileDialog::getSaveFileName(this, tr("Save File"),
-                                                   QDir::cleanPath(settings.last_dir + "/untitled.dbc"), tr("DBC (*.dbc)"));
-  if (!file_name.isEmpty()) {
+  if (file_name.isEmpty()) {
+    saveAsDBCToFile();
+  } else {
     settings.last_dir = QFileInfo(file_name).absolutePath();
     QFile file(file_name);
     if (file.open(QIODevice::WriteOnly)) {
       file.write(dbc()->generateDBC().toUtf8());
-      detail_widget->undo_stack->clear();
     }
   }
 }
 
+void MainWindow::saveAsDBCToFile() {
+  file_name = QFileDialog::getSaveFileName(this, tr("Save File"), QDir::cleanPath(settings.last_dir + "/untitled.dbc"), tr("DBC (*.dbc)"));
+  if (!file_name.isEmpty()) {
+    saveDBCToFile();
+  }
+}
+
 void MainWindow::saveDBCToClipboard() {
   QGuiApplication::clipboard()->setText(dbc()->generateDBC());
   QMessageBox::information(this, tr("Copy To Clipboard"), tr("DBC Successfully copied!"));

tools/cabana/mainwin.h

@@ -28,6 +28,7 @@ public slots:
   void loadDBCFromFile();
   void loadDBCFromClipboard();
   void saveDBCToFile();
+  void saveAsDBCToFile();
   void saveDBCToClipboard();
 
 signals:
@@ -57,4 +58,5 @@ protected:
   QJsonDocument fingerprint_to_dbc;
   QComboBox *dbc_combo;
   QSplitter *video_splitter;;
+  QString file_name = "";
 };