cabana: support toggle between light / dark theme (#27787)

add dark theme

tools/cabana/cabana.cc

@@ -15,6 +15,7 @@ int main(int argc, char *argv[]) {
   QApplication app(argc, argv);
   app.setApplicationDisplayName("Cabana");
   app.setWindowIcon(QIcon(":cabana-icon.png"));
+  utils::setTheme(settings.theme);
 
   QCommandLineParser cmd_parser;
   cmd_parser.addHelpOption();

tools/cabana/chartswidget.cc

@@ -85,8 +85,6 @@ ChartsWidget::ChartsWidget(QWidget *parent) : align_timer(this), QFrame(parent)
   main_layout->addWidget(charts_scroll);
 
   // init settings
-  use_dark_theme = QApplication::palette().color(QPalette::WindowText).value() >
-                   QApplication::palette().color(QPalette::Background).value();
   column_count = std::clamp(settings.chart_column_count, 1, MAX_COLUMN_COUNT);
   max_chart_range = std::clamp(settings.chart_range, 1, settings.max_cached_minutes * 60);
   display_range = {0, max_chart_range};
@@ -231,7 +229,7 @@ ChartView *ChartsWidget::createChart() {
   chart->setFixedHeight(settings.chart_height);
   chart->setMinimumWidth(CHART_MIN_WIDTH);
   chart->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Fixed);
-  chart->chart()->setTheme(use_dark_theme ? QChart::QChart::ChartThemeDark : QChart::ChartThemeLight);
+  chart->chart()->setTheme(settings.theme == 2 ? QChart::QChart::ChartThemeDark : QChart::ChartThemeLight);
   QObject::connect(chart, &ChartView::remove, [=]() { removeChart(chart); });
   QObject::connect(chart, &ChartView::zoomIn, this, &ChartsWidget::zoomIn);
   QObject::connect(chart, &ChartView::zoomUndo, this, &ChartsWidget::zoomUndo);

tools/cabana/chartswidget.h

@@ -173,7 +173,6 @@ private:
   std::pair<double, double> display_range;
   std::pair<double, double> zoomed_range;
   QStack<QPair<double, double>> zoom_stack;
-  bool use_dark_theme = false;
   QAction *columns_action;
   int column_count = 1;
   int current_column_count = 0;

tools/cabana/mainwin.cc

@@ -541,6 +541,7 @@ void MainWindow::updateDownloadProgress(uint64_t cur, uint64_t total, bool succe
 
 void MainWindow::updateStatus() {
   status_label->setText(tr("Cached Minutes:%1 FPS:%2").arg(settings.max_cached_minutes).arg(settings.fps));
+  utils::setTheme(settings.theme);
 }
 
 void MainWindow::dockCharts(bool dock) {

tools/cabana/settings.cc

@@ -27,6 +27,7 @@ void Settings::save() {
   s.setValue("recent_files", recent_files);
   s.setValue("message_header_state", message_header_state);
   s.setValue("chart_series_type", chart_series_type);
+  s.setValue("theme", theme);
   s.setValue("sparkline_range", sparkline_range);
 }
 
@@ -45,6 +46,7 @@ void Settings::load() {
   recent_files = s.value("recent_files").toStringList();
   message_header_state = s.value("message_header_state").toByteArray();
   chart_series_type = s.value("chart_series_type", 0).toInt();
+  theme = s.value("theme", 0).toInt();
   sparkline_range = s.value("sparkline_range", 15).toInt();
 }
 
@@ -54,6 +56,12 @@ SettingsDlg::SettingsDlg(QWidget *parent) : QDialog(parent) {
   setWindowTitle(tr("Settings"));
   QFormLayout *form_layout = new QFormLayout(this);
 
+  theme = new QComboBox(this);
+  theme->setToolTip(tr("You may need to restart cabana after changes theme"));
+  theme->addItems({tr("Automatic"), tr("Light"), tr("Dark")});
+  theme->setCurrentIndex(settings.theme);
+  form_layout->addRow(tr("Color Theme"), theme);
+
   fps = new QSpinBox(this);
   fps->setRange(10, 100);
   fps->setSingleStep(10);
@@ -87,6 +95,7 @@ SettingsDlg::SettingsDlg(QWidget *parent) : QDialog(parent) {
 
 void SettingsDlg::save() {
   settings.fps = fps->value();
+  settings.theme = theme->currentIndex();
   settings.max_cached_minutes = cached_minutes->value();
   settings.chart_series_type = chart_series_type->currentIndex();
   settings.chart_height = chart_height->value();

tools/cabana/settings.h

@@ -19,6 +19,7 @@ public:
   int chart_column_count = 1;
   int chart_range = 3 * 60; // 3 minutes
   int chart_series_type = 0;
+  int theme = 0;
   int sparkline_range = 15; // 15 seconds
   QString last_dir;
   QString last_route_dir;
@@ -42,6 +43,7 @@ public:
   QSpinBox *cached_minutes;
   QSpinBox *chart_height;
   QComboBox *chart_series_type;
+  QComboBox *theme;
 };
 
 extern Settings settings;

tools/cabana/util.cc

@@ -8,6 +8,7 @@
 #include <limits>
 
 #include "selfdrive/ui/qt/util.h"
+#include "tools/cabana/settings.h"
 
 static QColor blend(QColor a, QColor b) {
   return QColor((a.red() + b.red()) / 2, (a.green() + b.green()) / 2, (a.blue() + b.blue()) / 2, (a.alpha() + b.alpha()) / 2);
@@ -145,8 +146,7 @@ QValidator::State NameValidator::validate(QString &input, int &pos) const {
 
 namespace utils {
 QPixmap icon(const QString &id) {
-  static bool dark_theme = QApplication::palette().color(QPalette::WindowText).value() >
-                           QApplication::palette().color(QPalette::Background).value();
+  bool dark_theme = settings.theme == 2;
   QPixmap pm;
   QString key = "bootstrap_" % id % (dark_theme ? "1" : "0");
   if (!QPixmapCache::find(key, &pm)) {
@@ -154,12 +154,44 @@ QPixmap icon(const QString &id) {
     if (dark_theme) {
       QPainter p(&pm);
       p.setCompositionMode(QPainter::CompositionMode_SourceIn);
-      p.fillRect(pm.rect(), Qt::lightGray);
+      p.fillRect(pm.rect(), Qt::white);
     }
     QPixmapCache::insert(key, pm);
   }
   return pm;
 }
+
+void setTheme(int theme) {
+  auto style = QApplication::style();
+  if (!style) return;
+
+  static int prev_theme = 0;
+  if (theme != prev_theme) {
+    prev_theme = theme;
+    if (theme == 2) {
+      // modify palette to dark
+      QPalette darkPalette;
+      darkPalette.setColor(QPalette::Window, QColor(53, 53, 53));
+      darkPalette.setColor(QPalette::WindowText, Qt::white);
+      darkPalette.setColor(QPalette::Base, QColor(25, 25, 25));
+      darkPalette.setColor(QPalette::AlternateBase, QColor(53, 53, 53));
+      darkPalette.setColor(QPalette::ToolTipBase, Qt::white);
+      darkPalette.setColor(QPalette::ToolTipText, QColor(41, 41, 41));
+      darkPalette.setColor(QPalette::Text, Qt::white);
+      darkPalette.setColor(QPalette::Button, QColor(53, 53, 53));
+      darkPalette.setColor(QPalette::ButtonText, Qt::white);
+      darkPalette.setColor(QPalette::BrightText, Qt::red);
+      darkPalette.setColor(QPalette::Link, QColor(42, 130, 218));
+      darkPalette.setColor(QPalette::Highlight, QColor(42, 130, 218));
+      darkPalette.setColor(QPalette::HighlightedText, Qt::black);
+      qApp->setPalette(darkPalette);
+    } else {
+      qApp->setPalette(style->standardPalette());
+    }
+    style->polish(qApp);
+  }
+}
+
 }  // namespace utils
 
 QToolButton *toolButton(const QString &icon, const QString &tooltip) {

tools/cabana/util.h

@@ -98,6 +98,7 @@ public:
 
 namespace utils {
 QPixmap icon(const QString &id);
+void setTheme(int theme);
 inline QString formatSeconds(int seconds) {
   return QDateTime::fromTime_t(seconds).toString(seconds > 60 * 60 ? "hh:mm:ss" : "mm:ss");
 }