fixed hidpi scaling for the settings window

resources/qss/settings.qss

@@ -3,7 +3,7 @@
 }
 
 * {
-    font-size: 14px;
+    font-size: <font-size>px;
 }
 
 SettingsDialogTab:hover {
@@ -17,3 +17,8 @@ QLabel, QCheckBox, QGroupBox, SettingsDialogTab {
 QGroupBox {
     background-color: #444;
 }
+
+QCheckBox::indicator {
+    width: <checkbox-size>px;
+    height: <checkbox-size>px;
+}

src/main.cpp

@@ -69,6 +69,8 @@ inline bool initSettings(bool portable)
 
 int main(int argc, char *argv[])
 {
+    //    QApplication::setAttribute(Qt::AA_Use96Dpi, true);
+    QApplication::setAttribute(Qt::AA_UseSoftwareOpenGL, true);
     QApplication a(argc, argv);
 
 #ifdef USEWINSDK

src/widgets/basewidget.cpp

@@ -37,6 +37,7 @@ BaseWidget::BaseWidget(QWidget *parent)
 
 float BaseWidget::getDpiMultiplier()
 {
+    //    return 1.f;
     BaseWidget *baseWidget = dynamic_cast<BaseWidget *>(this->window());
 
     if (baseWidget == nullptr) {
@@ -90,8 +91,7 @@ bool BaseWidget::nativeEvent(const QByteArray &eventType, void *message, long *r
         this->dpiMultiplier = dpi / 96.f;
         float scale = this->dpiMultiplier / oldDpiMultiplier;
 
-        qDebug() << scale;
+        this->dpiMultiplyerChanged(oldDpiMultiplier, this->dpiMultiplier);
-        qDebug() << dpi;
 
         this->resize(static_cast<int>(this->width() * scale),
                      static_cast<int>(this->height() * scale));

src/widgets/basewidget.hpp

@@ -34,6 +34,10 @@ protected:
 #ifdef USEWINSDK
     virtual bool nativeEvent(const QByteArray &eventType, void *message, long *result) override;
 #endif
+
+    virtual void dpiMultiplyerChanged(float oldDpi, float newDpi)
+    {
+    }
     void initAsWindow();
 
 private:

src/widgets/helper/settingsdialogtab.cpp

@@ -14,9 +14,6 @@ SettingsDialogTab::SettingsDialogTab(SettingsDialog *_dialog, QString _labelText
     this->ui.labelText = _labelText;
     this->ui.image.load(imageFileName);
 
-    // XXX: DPI (not sure if this is auto-adjusted with custom DPI)
-    this->setFixedHeight(32);
-
     this->setCursor(QCursor(Qt::PointingHandCursor));
 
     this->setStyleSheet("color: #FFF");
@@ -28,6 +25,8 @@ void SettingsDialogTab::setSelected(bool _selected)
         return;
     }
 
+    //    height: <checkbox-size>px;
+
     this->selected = _selected;
     emit selectedChanged(selected);
 }

src/widgets/settingsdialog.cpp

@@ -10,6 +10,7 @@
 #include <QDebug>
 #include <QFile>
 #include <QFileDialog>
+#include <QFont>
 #include <QFontDialog>
 #include <QFormLayout>
 #include <QGroupBox>
@@ -31,11 +32,6 @@ SettingsDialog::SettingsDialog()
 {
     this->initAsWindow();
 
-    QFile file(":/qss/settings.qss");
-    file.open(QFile::ReadOnly);
-    QString styleSheet = QLatin1String(file.readAll());
-    this->setStyleSheet(styleSheet);
-
     QPalette palette;
     palette.setColor(QPalette::Background, QColor("#444"));
     this->setPalette(palette);
@@ -48,11 +44,10 @@ SettingsDialog::SettingsDialog()
 
     this->ui.vbox.addWidget(&this->ui.buttonBox);
 
-    auto tabWidget = new QWidget();
+    auto tabWidget = &ui.tabWidget;
     tabWidget->setObjectName("tabWidget");
 
     tabWidget->setLayout(&this->ui.tabs);
-    tabWidget->setFixedWidth(200);
 
     this->ui.hbox.addWidget(tabWidget);
     this->ui.hbox.addLayout(&this->ui.pageStack);
@@ -71,6 +66,8 @@ SettingsDialog::SettingsDialog()
     this->resize(600, 500);
 
     this->addTabs();
+
+    this->dpiMultiplyerChanged(this->getDpiMultiplier(), this->getDpiMultiplier());
 }
 
 void SettingsDialog::addTabs()
@@ -578,6 +575,7 @@ void SettingsDialog::addTab(QBoxLayout *layout, QString title, QString imageRes)
     tab->setWidget(widget);
 
     this->ui.tabs.addWidget(tab, 0, Qt::AlignTop);
+    tabs.push_back(tab);
 
     this->ui.pageStack.addWidget(widget);
 
@@ -610,6 +608,44 @@ void SettingsDialog::showDialog()
     instance->setFocus();
 }
 
+void SettingsDialog::dpiMultiplyerChanged(float oldDpi, float newDpi)
+{
+    QFile file(":/qss/settings.qss");
+    file.open(QFile::ReadOnly);
+    QString styleSheet = QLatin1String(file.readAll());
+    styleSheet.replace("<font-size>", QString::number((int)(14 * newDpi)));
+    styleSheet.replace("<checkbox-size>", QString::number((int)(14 * newDpi)));
+
+    for (SettingsDialogTab *tab : this->tabs) {
+        tab->setFixedHeight((int)(30 * newDpi));
+    }
+
+    this->setStyleSheet(styleSheet);
+
+    this->ui.tabWidget.setFixedWidth((int)(200 * newDpi));
+}
+
+void SettingsDialog::setChildrensFont(QLayout *object, QFont &font, int indent)
+{
+    //    for (QWidget *widget : this->widgets) {
+    //        widget->setFont(font);
+    //    }
+    //    for (int i = 0; i < object->count(); i++) {
+    //        if (object->itemAt(i)->layout()) {
+    //            setChildrensFont(object->layout()->itemAt(i)->layout(), font, indent + 2);
+    //        }
+
+    //        if (object->itemAt(i)->widget()) {
+    //            object->itemAt(i)->widget()->setFont(font);
+
+    //            if (object->itemAt(i)->widget()->layout() &&
+    //                !object->itemAt(i)->widget()->layout()->isEmpty()) {
+    //                setChildrensFont(object->itemAt(i)->widget()->layout(), font, indent + 2);
+    //            }
+    //        }
+    //    }
+}
+
 /// Widget creation helpers
 QVBoxLayout *SettingsDialog::createTabLayout()
 {

src/widgets/settingsdialog.hpp

@@ -33,8 +33,12 @@ public:
 
     static void showDialog();
 
+protected:
+    virtual void dpiMultiplyerChanged(float oldDpi, float newDpi) override;
+
 private:
     SettingsSnapshot snapshot;
+    std::vector<SettingsDialogTab *> tabs;
 
     pajlada::Settings::Setting<int> usernameDisplayMode;
 
@@ -42,6 +46,7 @@ private:
         QVBoxLayout tabs;
         QVBoxLayout vbox;
         QHBoxLayout hbox;
+        QWidget tabWidget;
         QStackedLayout pageStack;
         QDialogButtonBox buttonBox;
         QPushButton okButton;
@@ -49,8 +54,8 @@ private:
     } ui;
 
     void addTab(QBoxLayout *layout, QString title, QString imageRes);
-
     void addTabs();
+
     QVBoxLayout *createAccountsTab();
     QVBoxLayout *createAppearanceTab();
     QVBoxLayout *createMessagesTab();
@@ -84,6 +89,8 @@ private:
     void cancelButtonClicked();
 
     std::vector<pajlada::Signals::ScopedConnection> managedConnections;
+
+    static void setChildrensFont(QLayout *object, QFont &font, int indent = 0);
 };
 
 }  // namespace widgets