Cabana: remember last directory in open file dialog (#26449)

* remember last directory in open file dialog

* use QFileInfo
old-commit-hash: 122c0ec135

tools/cabana/mainwin.cc

@@ -156,8 +156,9 @@ void MainWindow::loadDBCFromName(const QString &name) {
 }
 
 void MainWindow::loadDBCFromFile() {
-  QString file_name = QFileDialog::getOpenFileName(this, tr("Open File"), QDir::homePath(), "DBC (*.dbc)");
+  QString 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);
     if (file.open(QIODevice::ReadOnly)) {
       auto dbc_name = QFileInfo(file_name).baseName();
@@ -185,8 +186,9 @@ void MainWindow::loadDBCFromFingerprint() {
 
 void MainWindow::saveDBCToFile() {
   QString file_name = QFileDialog::getSaveFileName(this, tr("Save File"),
-                                                   QDir::homePath() + "/untitled.dbc", tr("DBC (*.dbc)"));
+                                                   QDir::cleanPath(settings.last_dir + "/untitled.dbc"), tr("DBC (*.dbc)"));
   if (!file_name.isEmpty()) {
+    settings.last_dir = QFileInfo(file_name).absolutePath();
     QFile file(file_name);
     if (file.open(QIODevice::WriteOnly))
       file.write(dbc()->generateDBC().toUtf8());
@@ -228,6 +230,8 @@ void MainWindow::closeEvent(QCloseEvent *event) {
   main_win = nullptr;
   if (floating_window)
     floating_window->deleteLater();
+
+  settings.save();
   QWidget::closeEvent(event);
 }
 

tools/cabana/settings.cc

@@ -1,6 +1,7 @@
 #include "tools/cabana/settings.h"
 
 #include <QDialogButtonBox>
+#include <QDir>
 #include <QFormLayout>
 #include <QSettings>
 
@@ -19,7 +20,7 @@ void Settings::save() {
   s.setValue("chart_height", chart_height);
   s.setValue("chart_theme", chart_theme);
   s.setValue("max_chart_x_range", max_chart_x_range);
-  emit changed();
+  s.setValue("last_dir", last_dir);
 }
 
 void Settings::load() {
@@ -30,6 +31,7 @@ void Settings::load() {
   chart_height = s.value("chart_height", 200).toInt();
   chart_theme = s.value("chart_theme", 0).toInt();
   max_chart_x_range = s.value("max_chart_x_range", 3 * 60).toInt();
+  last_dir = s.value("last_dir", QDir::homePath()).toString();
 }
 
 // SettingsDlg
@@ -90,4 +92,5 @@ void SettingsDlg::save() {
   settings.max_chart_x_range = max_chart_x_range->value() * 60;
   settings.save();
   accept();
+  emit settings.changed();
 }

tools/cabana/settings.h

@@ -18,6 +18,7 @@ public:
   int chart_height = 200;
   int chart_theme = 0;
   int max_chart_x_range = 3 * 60; // 3 minutes
+  QString last_dir;
 
 signals:
   void changed();